CN116141557B - Gas cylinder liner and preparation method and application thereof - Google Patents
Gas cylinder liner and preparation method and application thereofInfo
- Publication number
- CN116141557B CN116141557B CN202111137760.3A CN202111137760A CN116141557B CN 116141557 B CN116141557 B CN 116141557B CN 202111137760 A CN202111137760 A CN 202111137760A CN 116141557 B CN116141557 B CN 116141557B
- Authority
- CN
- China
- Prior art keywords
- gas cylinder
- cylinder liner
- nylon
- microspheres
- nylon microspheres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/251—Particles, powder or granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7154—Barrels, drums, tuns, vats
- B29L2031/7156—Pressure vessels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/21—Shaping processes
- F17C2209/2109—Moulding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Moulding By Coating Moulds (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
本发明涉及一种气瓶内胆及其制备方法和应用，制备方法为：采用尼龙微球按滚塑工艺进行加工制得气瓶内胆；尼龙微球的数均分子量大于等于2万g/mol；尼龙微球的平均粒径为0.1～50μm；尼龙微球的松散堆积密度大于0.65g/cm3；尼龙微球具有高正球度和平滑的表面形态，高正球度即正球度为90％以上；制得的气瓶内胆的厚度为100μm～5mm；气瓶内胆的氢气透过系数小于3.5×10‑11cm3·cm/cm2·s·cmHg，反复充/卸载能力优良，力学性能优良；应用为：将制得的气瓶内胆用于制作气瓶，气瓶的承受压力大于75MPa。本发明所用尼龙微球具有高正球度，流动性好，所得内胆结构致密，防氢渗透性能优异，反复充/卸载能力优良，可满足承压能力较高的气瓶的要求。This invention relates to a gas cylinder liner, its preparation method, and its application. The preparation method involves processing nylon microspheres using a rotational molding process to obtain the gas cylinder liner. The nylon microspheres have a number-average molecular weight greater than or equal to 20,000 g/mol; an average particle size of 0.1–50 μm; a loose bulk density greater than 0.65 g/ cm³ ; and high sphericity (over 90%). The resulting gas cylinder liner has a thickness of 100 μm–5 mm. The hydrogen permeability coefficient of the gas cylinder liner is less than 3.5 × 10⁻¹¹ cm³· cm / cm² ·s·cmHg, exhibiting excellent repeated filling/unloading capability and superior mechanical properties. The application involves using the prepared gas cylinder liner to manufacture gas cylinders with a pressure resistance greater than 75 MPa. The nylon microspheres used in this invention have high sphericity and good fluidity. The resulting inner liner has a dense structure, excellent hydrogen permeability resistance, and excellent repeated filling/unloading capability, which can meet the requirements of gas cylinders with high pressure resistance.
Description
Technical Field
The invention belongs to the technical field of gas cylinders, and relates to a gas cylinder liner, a preparation method and application thereof.
Background
In recent years, in order to cope with the requirements of exhaustion of petroleum fuel and reduction of the emission of harmful gases, fuel cells and electric vehicles are rapidly developed and industrialized, and are attracting attention as high-pressure gas tanks for mounting on vehicles. The liner is a core component of the high-pressure gas tank, needs to bear higher mechanical stress, and can bear the working temperature range of minus 60 to plus 120 ℃. The quality of the liner directly determines the safety and the service life of the high-pressure gas tank.
The light IV-type gas cylinder, namely the plastic liner fiber fully-wound gas cylinder, is the current and future research direction. Several patents have reported thermoplastic resin liners. The polyamide resin (Polyamide, PA for short) has excellent mechanical property and better electrical property, and simultaneously has the characteristics of friction resistance, abrasion resistance, oil resistance, organic solvent resistance and the like, so that the polyamide resin is widely applied and becomes engineering plastic with the maximum yield. Prior art commonly used polyamide resins for making liners, for example, patent CN103261325A discloses the addition of other additives to polyamide for blow molding for making liners, and patent CN106255726A discloses materials for hydrogen tank liners formed from polyamide resin compositions comprising polyamide 6, copolyamide and impact resistant materials.
The rotational moulding technology is that the plastic raw material (powder) is added into the mould, then the mould is continuously rotated along two vertical axes and heated, so that the plastic raw material in the mould is gradually and evenly coated and fused and adhered on the whole surface of the mould cavity under the action of gravity and heat energy, formed into the required shape, cooled, shaped and demoulded, and finally the product is obtained. Rotational molding differs from all other processing methods in that the heating, melting, molding and cooling stages all occur after the polymer is placed into the mold. In addition, no external pressure is used to force the molten polymer into the mold. Rotational molded products are substantially stress free, have no weld lines, and can be produced in complex shapes. In addition, the mould costs are relatively low, large articles can be produced economically, and large-size components up to 150 litres can be manufactured, even beyond this value.
However, the amount of polymeric material available for the rotomoulding process is limited. The most widely used polymers are polyethylene, especially medium density polyethylene. May be other polymers including polypropylene, polyvinyl chloride, and to a lesser extent polyamides (i.e., nylon), polyethylene-co-vinyl acetate, and polycarbonate. The rotational molding product has low compactness, easy defect formation, high requirement on melt flow rate and powdery raw material.
In the prior art, nylon resins such as PA6 and the like have poor applicability to rotational molding processes. The nylon resin is adopted to process the inner container with excellent gas blocking effect, pressure bearing capacity and repeated filling/unloading capacity according to the rotational molding process, polyamide with good fluidity is required to be selected to meet the requirement of the rotational molding process on melt flow rate, the polyamide with good fluidity is low in molecular weight and poor in crystallization, the strength of the product is poor and the inner container with high compactness is difficult to form, the low compactness of the inner container can enable the inner container to be insufficient in blocking of small molecular weight gases such as hydrogen and the like, the hydrogen is easy to permeate into the resin, and the high-pressure hydrogen is more accumulated in the resin compared with the normal-pressure hydrogen, so that the polyamide resin inner container has the problems that the tank is not enough in pressure resistance during repeated filling and pressure relief of the high-pressure hydrogen and is easy to deform or destroy.
Thus, there is a definite need for a method that overcomes these drawbacks, disadvantages and obstacles of the prior art, and in particular for a method that allows obtaining a liner for hydrogen storage bottles that does not exhibit the above drawbacks.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a gas cylinder liner, a preparation method and application thereof, wherein the gas cylinder liner is prepared by adopting nylon microspheres according to a rotational molding process, and the prepared gas cylinder liner has excellent gas blocking effect, bearing capacity and repeated filling/unloading capacity.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The preparation method of the gas cylinder liner adopts nylon microspheres to process according to a rotational molding process to prepare the gas cylinder liner; the number average molecular weight of the nylon microsphere is more than or equal to 2 ten thousand g/mol; the invention discloses a nylon resin with the mechanical property of about 2 ten thousand g/mol, the number average molecular weight of the nylon resin is more difficult to process and is higher than that of other processing modes, the rotational molding process has higher requirements on the fluidity of the resin, the viscosity is too high, the fluidity of a melt is too low, the melting temperature and the heating time are required to be increased, the heating time is long, the ageing of the material is caused, the performance of a product is influenced, and the cost is increased.
As a preferable technical scheme:
According to the preparation method of the gas cylinder liner, the number average molecular weight of the nylon microspheres is more than or equal to 3 ten thousand g/mol.
According to the preparation method of the gas cylinder liner, the number average molecular weight of the nylon microspheres is more than or equal to 5 ten thousand g/mol.
The preparation method of the gas cylinder liner comprises the steps that nylon microspheres are composed of polymers with amide bonds and mainly composed of lactam or diamine and dicarboxylic acid; typical examples of the raw materials are lactams such as epsilon-caprolactam, caprylic lactam, omega-dodecalactam, aliphatic diamines such as tetramethylenediamine, hexamethylenediamine, undecylenediamine, and dodecylenediamine, aromatic diamines such as m-xylylenediamine and p-xylylenediamine, aliphatic dicarboxylic acids such as adipic acid, suberic acid, azelaic acid, sebacic acid, and dodecanedioic acid, aromatic dicarboxylic acids such as terephthalic acid, and isophthalic acid, and polyamide homopolymers and copolymers derived from these raw materials can be used in the present invention;
Preferred nylon microspheres include nylon 6 (polycaprolactam) microspheres, nylon 12 (polydodeolactam) microspheres or nylon 6/12 (polycaprolactam/dodecalactam) microspheres, and further, it is suitable to use these nylon microspheres as a mixture as long as the effect of the present invention is not impaired;
The preparation method of the nylon microsphere comprises a physical method and a chemical method, wherein the physical method comprises a mechanical crushing method, a solvent precipitation method and a melt blending method, the chemical method comprises a precipitation polymerization method, a suspension polymerization method, an emulsion polymerization method, a reaction induced phase separation method and the like, the nylon microsphere adopted by the invention can be prepared by any method, preferably by a reaction-induced phase separation method, and the nylon microsphere prepared by the method has higher sphericity, more uniform particle size and higher yield.
According to the preparation method of the gas cylinder liner, the average particle size of the nylon microspheres is 0.1-50 mu m.
According to the preparation method of the gas cylinder liner, the loose packing density of nylon microspheres (the average density of loose packing bodies of loose packing density comprising inner holes, outer holes and gaps among particles is calculated by dividing the total mass of non-tapped particle materials in a natural packing state by the total volume of the packed materials) is larger than 0.65g/cm 3 through the characteristics of a loose packing density tester, the larger loose packing density indicates that the wider the particle size distribution is, the larger the particle sizes are matched, so that the packing density is enough, the particle size distribution of the nylon microspheres is wide, and the small particle size microspheres can enter the gaps, so that the structure of the prepared gas cylinder liner is denser, and the precision and strength are higher.
In the method for preparing the gas cylinder liner, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 90% or more, preferably 95% or more, more preferably 98% or more, the upper limit value is 100%, the higher the sphericity is, the smaller the gaps are in stacking, the easier rolling is, and the better the powder fluidity is; the nylon microspheres adopted by the invention have smooth surfaces, and the smoother the surfaces of the microspheres, the smaller the flowing friction force among the microspheres and the better the fluidity.
According to the preparation method of the gas cylinder liner, the gas cylinder liner is prepared by adopting the conventional rotational molding machine, the mold is arranged to rotate along double shafts, and the double rotation can be performed on the conventional rolling mold, and the preparation method comprises the following specific steps of:
(1) Starting the biaxial rotation, starting a heating system, setting a preheating temperature (preferably 100-150 ℃) and preheating a die body to ensure the uniformity of the die temperature and avoid influencing the temperature uniformity due to the wall thickness of the die;
(2) After the preheating temperature is reached, nylon microspheres are put into the die body;
(3) Setting the heating temperature to be higher than the melting point of the nylon microsphere, setting the biaxial rotation speed to be a certain value, and rotating at constant temperature after the set heating temperature is reached;
(4) Stopping heating, and continuously keeping rotating, wherein the water mist is cooled (other cooling modes can be adopted);
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) Opening the mould, and taking out the product to obtain a gas cylinder liner;
the rotational speed in rotational molding is not particularly limited, but may be appropriately selected by those skilled in the art, since the fluidity of the nylon microspheres is greater than that of conventional nylon powder, the rotational speed may be appropriately higher than that of conventional nylon powder, for example, the rotational speeds of the main shaft and the auxiliary shaft in the prior art are 1 to 20 rpm, usually 2 to 10 rpm, and in the method of the present invention, the rotational speed may be 5 to 30 rpm, preferably 10 to 20 rpm.
According to the preparation method of the gas cylinder liner, the gas cylinder liner is prepared by adopting the conventional rotational molding machine, the mold is arranged to rotate along double shafts, and the double rotation can be performed on the conventional rolling mold, and the preparation method comprises the following specific steps of:
(I) Putting nylon microspheres into the die body, starting the biaxial rotation, and controlling the biaxial rotation speed of the die until the nylon microspheres are uniformly coated on the inner surface of the die body;
(II) starting a heating system, setting the heating temperature to be higher than the melting point of the nylon microspheres, and rotating at constant temperature after the set heating temperature is reached;
(III) stopping heating, continuously keeping rotating, and cooling the water mist (other cooling modes can be adopted);
(IV) continuing to rotate, and naturally cooling to normal temperature;
(V) opening the mould, and taking out the product to obtain a gas cylinder liner;
the rotational speed in rotational molding is not particularly limited, but may be appropriately selected by those skilled in the art, since the fluidity of the nylon microspheres is greater than that of conventional nylon powder, the rotational speed may be appropriately higher than that of conventional nylon powder, for example, the rotational speeds of the main shaft and the auxiliary shaft in the prior art are 1 to 20 rpm, usually 2 to 10 rpm, and in the method of the present invention, the rotational speed may be 5 to 30 rpm, preferably 10 to 20 rpm.
The invention also provides the gas cylinder liner prepared by the preparation method of the gas cylinder liner, wherein the thickness (namely the wall thickness) of the gas cylinder liner is 100 mu m-5 mm, preferably 0.5 mm-3 mm, the hydrogen permeability coefficient of the gas cylinder liner is less than 3.5X -11cm3·cm/cm2 s cm Hg, the repeated charging/discharging capability is excellent, and the mechanical property is excellent.
The invention also provides a gas cylinder, which comprises a gas cylinder liner, wherein the gas cylinder liner is the gas cylinder liner, and the bearing pressure of the gas cylinder is more than 75MPa.
The gas cylinder is formed by laminating a carbon fiber reinforced resin (CFRP) reinforcing layer on the outer surface of the gas cylinder liner;
The matrix resin constituting the CFRP reinforcing layer may be a thermosetting resin or a thermoplastic resin, examples of the main material thereof include epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polyurethane resin and silicone resin when the matrix resin is a thermosetting resin, only one of these types may be used or two or more types may be mixed for use, particularly preferably epoxy resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, ABS resin, polystyrene resin, AS resin, polyamide resin, polyacetal resin, polycarbonate resin, thermoplastic polyester resin, PPS resin when the matrix resin is a thermoplastic resin, and these thermoplastic resins may be used alone or AS a mixture of two or more types.
The principle of the invention is as follows:
The polyamide resin (Polyamide, PA for short) has excellent mechanical property and better electrical property, and simultaneously has the characteristics of friction resistance, abrasion resistance, oil resistance, organic solvent resistance and the like, so that the polyamide resin is widely applied and becomes engineering plastic with the maximum yield. The superfine nylon spherical powder has unique spherical shape, smooth surface, soft texture, rich amino (-NH 2), carboxyl (-COOH) and other functional groups, and thus has wide application foreground in medical engineering, biological material, liquid crystal display, paint, cosmetics and other fields. In addition, more than 95% of the powder materials used for selective laser sintering (SELECTIVE LASER SINTERING, SLS) on the market today are nylon powders, but such powders do not have high positive sphericity, cannot be called nylon microspheres, and are mostly PA12 powders.
The nylon microspheres used in the application have small particle size, are monodisperse (i.e. single particle size), have high sphericity, and the particle size can be controlled by the aid of the monodispersion and the high sphericity, so that the microspheres with the single particle size can be prepared, and then are prepared according to requirements. The nylon resin has a number average molecular weight of 2 ten thousand g/mol or more, preferably 3 ten thousand g/mol or more, more preferably 5 ten thousand g/mol or more, and the microsphere has adjustable particle size within the range of 0.1-50 μm and good fluidity.
Rotational moulding processes are very demanding in terms of polymer flowability and the crystallization rate of the polymer must not be too high in order to obtain articles of uniform thickness. Thus, polyamides that are generally better flowing (i.e., polyamides with lower molecular weights) sacrifice crystallinity and strength. The nylon microsphere with higher molecular weight is adopted in the invention, and can be uniformly coated in a die in a short time by a rotational molding process due to good fluidity, and in the process, the degradation of polyamide is small, so that the gas cylinder liner is still composed of polyamide with higher molecular weight, and the mechanical property of the gas cylinder liner product is good. Meanwhile, plastic powder is used in rotational molding in the prior art, most of raw materials used in the rotational molding of nylon parts in the market are random powder obtained by crushing nylon 6 slices into about 100 meshes, and the random powder is rolled, spread and melted on the inner surface of a heating rotational molding die. The spherical powder is adopted to replace the nylon powder crushed in irregular shape, and as the powder of the spherical powder has better flowing spreadability, higher bulk density on the inner surface of the die, even compaction is coated on the surface of the die before melting, the melting plasticizing process is more favorable for forming compact (without air holes and defects) rotomolding products, even compaction is realized after melting, cooling crystallization is also realized, therefore, the density and thickness of the gas cylinder liner product are high, the permeation of hydrogen and the dissolution of hydrogen in the resin can be inhibited, the occurrence of defect points can be effectively inhibited in the repeated filling/pressure relief process, and the mold release property of the molded product is excellent. In addition, the nylon microsphere has small usage amount, and can reduce cost.
The invention combines nylon microsphere and rotational molding process, which can overcome the defect of low compactness of rotational molding product, and obtain advantages of rotational molding process, and can obtain gas cylinder liner with excellent gas barrier property and good pressure resistance.
The beneficial effects are that:
(1) The nylon microsphere used in the invention has high molecular weight, and the obtained gas cylinder has excellent internal boldness chemical properties;
(2) The nylon microsphere used in the invention has high sphericity and good fluidity, and the obtained gas cylinder liner has compact structure and excellent hydrogen permeation (gas blocking) resistance;
(3) The nylon microsphere has the advantages of small usage amount, short processing time and effective cost reduction.
Detailed Description
The application is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The test methods for some of the performance indicators in the following examples and comparative examples are as follows:
Nylon microsphere number average molecular weight (Mn) was measured by GPC model Water-991.
The positive sphericity of the nylon microspheres is determined by observing 30 particles from a scanning electron microscope photograph and determining the short diameter and the long diameter according to the following mathematical formula:
wherein S is positive sphericity, a is long diameter, b is short diameter, and n is measured number 30.
Bulk density was characterized by a bulk densitometer.
Hydrogen permeability coefficient according to JIS K7126A method (differential pressure method), a sample of the liner was taken at a temperature of 35℃and tested on a Labthink blue G2/131 gas permeation tester.
The high-pressure hydrogen repeated filling/unloading capability is that a sample with the length of 10mm multiplied by the circumferential length of 30mm is taken from a gas cylinder liner product obtained by a rotational molding process, X-ray CT analysis is carried out on a test piece, whether defect points exist or not is observed, the defect-free sample is placed into an autoclave, then the autoclave is filled with hydrogen for 3 minutes until the pressure is 30MPa, the pressure is maintained for 2 hours, and then the pressure is reduced to be normal after 1 minute. This was set to 1 cycle, and 700 cycles were repeated. Similarly, the sample after repeating 700 cycles was subjected to X-ray CT analysis, and the presence or absence of defect points of 10 μm or more was observed.
Tensile strength with reference to ISO-527-1,2, test temperature is 23 ℃.
Tensile modulus with reference to ISO-527-1,2, test temperature is 23 ℃.
Flexural strength with reference to ISO 178, the test temperature is 23 ℃.
Flexural modulus with reference to ISO 178, the test temperature is 23 ℃.
Impact strength with reference to ISO 179-1, the test temperature is 23 ℃.
The bearing pressure of the gas cylinder is measured by a normal temperature pressure cycle test and a limit temperature pressure cycle test in GB/T35544-2017.
Example 1
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to be 100 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 6 microspheres, the number average molecular weight of the nylon microspheres is 2 ten thousand g/mol, the average particle size of the nylon microspheres is 0.1 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 92%, and the loose stacking density of the nylon microspheres is 0.7g/cm 3;
(3) Setting the heating temperature to be 10 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 30 revolutions per minute, wherein the mold is rotated for 5 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 70 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 1mm, the hydrogen permeability coefficient of the gas cylinder liner is 2.3X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 50MPa, the tensile modulus is 0.3GPa, the bending strength is 25MPa, the bending modulus is 0.5GPa, and the impact strength is 20KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 75MPa.
Comparative example 1
A preparation method of a gas cylinder liner is basically the same as in example 1, except that nylon 6 slices with the number average molecular weight of 2 ten thousand g/mol are crushed into 100-mesh irregular powder instead of nylon microspheres.
The prepared gas cylinder liner has rough surface and uneven wall thickness, has a hydrogen permeation coefficient of 23 multiplied by 10 - 11cm3·cm/cm2.s.cmHg, has poor repeated filling/unloading capability, has a tensile strength of 30MPa, a tensile modulus of 0.1GPa, a bending strength of 10MPa, a bending modulus of 0.2GPa and an impact strength of 10KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared by the method, and the bearing pressure of the gas cylinder is 45MPa.
Compared with the embodiment 1, the gas barrier property, the repeated filling/unloading capability and the mechanical property of the gas cylinder liner of the comparative example 1 are poor, because the embodiment 1 adopts the nylon microsphere as the raw material, the nylon microsphere has good fluidity and compact stacking, the nylon microsphere is uniformly and densely coated on the surface of the die before melting, and the cooling crystallization is also uniformly and densely performed after melting, so that the gas cylinder liner product has high density and uniform thickness, can inhibit the permeation of hydrogen and the dissolution of hydrogen in the resin, and can effectively inhibit the occurrence of defect points in the repeated filling/pressure relief process.
Example 2
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Putting nylon microspheres into a die body, starting biaxial rotation, controlling the rotation speed ratio of the die to the Y axis to be 1:2.5 around the X axis and the Y axis to be 10 revolutions per minute until the nylon microspheres are uniformly coated on the inner surface of the die body, wherein the nylon microspheres are nylon 6 microspheres, the number average molecular weight of the nylon microspheres is 3 ten thousand g/mol, the average particle size of the nylon microspheres is 0.1 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the high sphericity is 94%, and the loose stacking density of the nylon microspheres is 1.0g/cm 3;
(2) Starting a heating system, setting the heating temperature to be 12 ℃ higher than the melting point of the nylon microspheres, and rotating at constant temperature for 5 minutes after the heating temperature reaches the set heating temperature;
(3) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 80 ℃;
(4) Continuously rotating, and naturally cooling to normal temperature;
(5) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 2mm, the hydrogen permeability coefficient of the gas cylinder liner is 3.4X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 60MPa, the tensile modulus is 0.5GPa, the bending strength is 40MPa, the bending modulus is 0.7GPa, and the impact strength is 40KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 80MPa.
Example 3
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to be 120 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 6 microspheres, the number average molecular weight of the nylon microspheres is 7 ten thousand g/mol, the average particle size of the nylon microspheres is 20 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 96%, and the loose bulk density of the nylon microspheres is 0.9g/cm 3;
(3) Setting the heating temperature to be 18 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 10 revolutions per minute, wherein the mold is rotated for 6 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 90 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The prepared gas cylinder liner has the thickness of 3mm, the hydrogen permeability coefficient of 1.3X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability of excellent, the tensile strength of 85MPa, the tensile modulus of 1.1GPa, the bending strength of 80MPa, the bending modulus of 1GPa and the impact strength of 80KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 95MPa.
Example 4
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Putting nylon microspheres into a die body, starting biaxial rotation, controlling the rotation speed ratio of the die to the Y axis to be 1:2.5 around the X axis and the Y axis to be 20 revolutions per minute until the nylon microspheres are uniformly coated on the inner surface of the die body, wherein the nylon microspheres are nylon 6 microspheres, the number average molecular weight of the nylon microspheres is 13 ten thousand g/mol, the average particle size of the nylon microspheres is 50 mu m, the nylon microspheres have high positive sphericity and smooth surface morphology, the high positive sphericity is 95%, and the loose bulk density of the nylon microspheres is 0.8g/cm 3;
(2) Starting a heating system, setting the heating temperature to be 22 ℃ higher than the melting point of the nylon microspheres, and rotating at constant temperature for 9 minutes after the heating temperature reaches the set heating temperature;
(3) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 110 ℃;
(4) Continuously rotating, and naturally cooling to normal temperature;
(5) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 0.5mm, the hydrogen permeability coefficient of the gas cylinder liner is 3.5X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 80MPa, the tensile modulus is 0.8GPa, the bending strength is 60MPa, the bending modulus is 0.9GPa, and the impact strength is 75KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 90MPa.
Example 5
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to be 115 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 6/12 microspheres, the number average molecular weight of the nylon microspheres is 5 ten thousand g/mol, the average particle size of the nylon microspheres is 1 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 95%, and the loose stacking density of the nylon microspheres is 0.68g/cm 3;
(3) Setting the heating temperature to be 15 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 10 revolutions per minute, wherein the mold is rotated for 5 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 80 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 1.5mm, the hydrogen permeability coefficient of the gas cylinder liner is 2.8X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 70MPa, the tensile modulus is 0.6GPa, the bending strength is 50MPa, the bending modulus is 0.8GPa, and the impact strength is 50KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 85MPa.
Example 6
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Putting nylon microspheres into a die body, starting biaxial rotation, controlling the rotation speed ratio of the die to the Y axis to be 1:2.5 around the X axis and the Y axis to be 25 revolutions per minute until the nylon microspheres are uniformly coated on the inner surface of the die body, wherein the nylon microspheres are nylon 6/12 microspheres, the number average molecular weight of the nylon microspheres is 10 ten thousand g/mol, the average particle size of the nylon microspheres is 15 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 96%, and the loose stacking density of the nylon microspheres is 0.75g/cm 3;
(2) Starting a heating system, setting the heating temperature to be 22 ℃ higher than the melting point of the nylon microspheres, and rotating at constant temperature for 8 minutes after the heating temperature reaches the set heating temperature;
(3) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 100 ℃;
(4) Continuously rotating, and naturally cooling to normal temperature;
(5) And opening the die, and taking out the product to obtain the gas cylinder liner.
The prepared gas cylinder liner has the thickness of 3mm, the hydrogen permeability coefficient of 2.5X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability of the gas cylinder liner is excellent, the tensile strength of 90MPa, the tensile modulus of 1.1GPa, the bending strength of 80MPa, the bending modulus of 1.1GPa and the impact strength of 70KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 95MPa.
Example 7
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to 140 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 6/12 microspheres, the number average molecular weight of the nylon microspheres is 15 ten thousand g/mol, the average particle size of the nylon microspheres is 20 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 100%, and the loose stacking density of the nylon microspheres is 0.95g/cm 3;
(3) Setting the heating temperature to be 28 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 20 revolutions per minute, wherein the mold is rotated for 10 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 115 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 4mm, the hydrogen permeability coefficient of the gas cylinder liner is 1.2X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 110MPa, the tensile modulus is 1.3GPa, the bending strength is 90MPa, the bending modulus is 1.3GPa, and the impact strength is 85KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 98MPa.
Example 8
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Putting nylon microspheres into a die body, starting biaxial rotation, controlling the rotation speed ratio of the die to the Y axis to be 1:2.5 around the X axis and the Y axis to be 25 revolutions per minute until the nylon microspheres are uniformly coated on the inner surface of the die body, wherein the nylon microspheres are nylon 12 microspheres, the number average molecular weight of the nylon microspheres is 8 ten thousand g/mol, the average particle size of the nylon microspheres is 5 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the high sphericity is 97%, and the loose stacking density of the nylon microspheres is 0.72g/cm 3;
(2) Starting a heating system, setting the heating temperature to be 20 ℃ higher than the melting point of the nylon microspheres, and rotating at constant temperature for 7 minutes after the heating temperature reaches the set heating temperature;
(3) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 90 ℃;
(4) Continuously rotating, and naturally cooling to normal temperature;
(5) And opening the die, and taking out the product to obtain the gas cylinder liner.
The prepared gas cylinder liner has the thickness of 2mm, the hydrogen permeability coefficient of 2.6X -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability of the gas cylinder liner is excellent, the tensile strength is 72MPa, the tensile modulus is 1GPa, the bending strength is 70MPa, the bending modulus is 1GPa, and the impact strength is 65KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 94MPa.
Example 9
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to be 135 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 12 microspheres, the number average molecular weight of the nylon microspheres is 12 ten thousand g/mol, the average particle size of the nylon microspheres is 30 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 97%, and the loose bulk density of the nylon microspheres is 0.85g/cm 3;
(3) Setting the heating temperature to be 25 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 20 revolutions per minute, wherein the mold is rotated for 9 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 110 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 3.5mm, the hydrogen permeability coefficient of the gas cylinder liner is 3 multiplied by 10 -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 100MPa, the tensile modulus is 1.2GPa, the bending strength is 85MPa, the bending modulus is 1.1GPa, and the impact strength is 80KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 96MPa.
Example 10
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Putting nylon microspheres into a die body, starting biaxial rotation, controlling the rotation speed ratio of the die to the Y axis to be 1:2.5 around the X axis and the Y axis to be 20 revolutions per minute until the nylon microspheres are uniformly coated on the inner surface of the die body, wherein the nylon microspheres are nylon 12 microspheres, the number average molecular weight of the nylon microspheres is 20 ten thousand g/mol, the average particle size of the nylon microspheres is 25 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the high sphericity is 98%, and the loose stacking density of the nylon microspheres is 1.0g/cm 3;
(2) Starting a heating system, setting the heating temperature to be 30 ℃ higher than the melting point of the nylon microspheres, and rotating at constant temperature for 10 minutes after the heating temperature reaches the set heating temperature;
(3) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 115 ℃;
(4) Continuously rotating, and naturally cooling to normal temperature;
(5) And opening the die, and taking out the product to obtain the gas cylinder liner.
The prepared gas cylinder liner has the thickness of 5mm, the hydrogen permeability coefficient of 1X 10 -11cm3·cm/cm2 s cm Hg, the repeated filling/unloading capability of excellent, the tensile strength of 120MPa, the tensile modulus of 1.5GPa, the bending strength of 100MPa, the bending modulus of 1.5GPa and the impact strength of 90KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 100MPa.
Example 11
A preparation method of a gas cylinder liner adopts a conventional rotational molding machine to prepare the gas cylinder liner, and a mold is arranged to rotate along double shafts, and comprises the following specific steps:
(1) Starting the double-shaft rotation, starting a heating system, setting the preheating temperature to 140 ℃, and preheating the die body;
(2) After the preheating temperature is reached, nylon microspheres are put into a die body, wherein the nylon microspheres are nylon 8 microspheres, the number average molecular weight of the nylon microspheres is 14 ten thousand g/mol, the average particle size of the nylon microspheres is 100 mu m, the nylon microspheres have high sphericity and smooth surface morphology, the sphericity is 98%, and the loose bulk density of the nylon microspheres is 0.65g/cm 3;
(3) Setting the heating temperature to be 28 ℃ higher than the melting point of the nylon microspheres, controlling the rotation speed ratio of the mold around the X axis and around the Y axis to be 1:2.5, and rotating the mold around the Y axis to be 20 revolutions per minute, wherein the mold is rotated for 10 minutes at constant temperature after reaching the set heating temperature;
(4) Stopping heating, continuously maintaining rotation, and cooling the water mist until the temperature is reduced to 115 ℃;
(5) Continuously rotating, and naturally cooling to normal temperature;
(6) And opening the die, and taking out the product to obtain the gas cylinder liner.
The thickness of the prepared gas cylinder liner is 1.5mm, the hydrogen permeability coefficient of the gas cylinder liner is 2 multiplied by 10 -11cm3·cm/cm2.s.cmHg, the repeated charging/discharging capability is excellent, the tensile strength is 100MPa, the tensile modulus is 1.2GPa, the bending strength is 84MPa, the bending modulus is 1GPa, and the impact strength is 80KJ/m 2.
The structure of the gas cylinder is basically the same as that of an IV type hydrogen storage cylinder in the prior art, and the difference is that the gas cylinder liner is prepared according to the steps, and the bearing pressure of the gas cylinder is 95MPa.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137760.3A CN116141557B (en) | 2021-09-27 | 2021-09-27 | Gas cylinder liner and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137760.3A CN116141557B (en) | 2021-09-27 | 2021-09-27 | Gas cylinder liner and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116141557A CN116141557A (en) | 2023-05-23 |
| CN116141557B true CN116141557B (en) | 2025-11-11 |
Family
ID=86349266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111137760.3A Active CN116141557B (en) | 2021-09-27 | 2021-09-27 | Gas cylinder liner and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116141557B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110027150A (en) * | 2019-05-17 | 2019-07-19 | 青岛罗泰克亿利汽车橡塑制品有限公司 | A kind of roll moulding shaping technology using nylon |
| CN113124309A (en) * | 2019-12-31 | 2021-07-16 | 中国科学院宁波材料技术与工程研究所 | Plastic inner container of high-pressure hydrogen storage bottle and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000038897A1 (en) * | 1998-12-23 | 2000-07-06 | Kingspan Research And Developments Limited | Rotational moulding method and apparatus |
| MX2017002264A (en) * | 2014-08-22 | 2017-05-03 | 3M Innovative Properties Co | Method and composition including thermoplastic particles and hollow microspheres and articles made from them. |
| CN107254163B (en) * | 2016-03-25 | 2019-11-22 | 中国科学院理化技术研究所 | A kind of nylon/silicon dioxide composite microsphere, preparation method and application |
| US11485822B2 (en) * | 2017-05-12 | 2022-11-01 | Toray Industries, Inc. | Method of producing polyamide fine particles, and polyamide fine particles |
-
2021
- 2021-09-27 CN CN202111137760.3A patent/CN116141557B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110027150A (en) * | 2019-05-17 | 2019-07-19 | 青岛罗泰克亿利汽车橡塑制品有限公司 | A kind of roll moulding shaping technology using nylon |
| CN113124309A (en) * | 2019-12-31 | 2021-07-16 | 中国科学院宁波材料技术与工程研究所 | Plastic inner container of high-pressure hydrogen storage bottle and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116141557A (en) | 2023-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2788124T3 (en) | Polymer Coated Inorganic Particulate Powder | |
| US10836117B2 (en) | Method for increasing the difference between the melting temperature and the crystallization temperature of a polyamide powder | |
| CN110612320B (en) | Method for producing polyamide microparticles and polyamide microparticles | |
| CN100422247C (en) | Laser-sintering powder with titanium dioxide particles, process for its preparation and molded parts produced from such laser-sintering powder | |
| CN102812089B (en) | Polyamide-based polymer powders, their use in molding processes and moldings produced from said polymer powders | |
| US10479733B2 (en) | Powder comprising polymer-coated core particles comprising metals, metal oxides, metal nitrides or semimetal nitrides | |
| EP2352636B1 (en) | Producing an item by the selective fusion of polymer powder layers | |
| CN102863639B (en) | Powder containing polymwer core particles coated with polymer | |
| JP6147473B2 (en) | How to increase the degree of recycling of polyamide used in sintering | |
| AU2005218063A1 (en) | Powder with improved recycling properties, process for its production, and use of the powder in a process for producing three-dimensional objects | |
| JPWO2011118441A1 (en) | Semi-aromatic polyamide and method for producing the same | |
| WO2020085360A1 (en) | Flexible polyamide | |
| EP1736502A1 (en) | Rotomoulded articles prepared from a blend of polyethylene powders | |
| CN101171294B (en) | Monolayer rotational molded article prepared from a blend comprising polyethylene | |
| CN109517376B (en) | Preparation method of nylon powder material for selective laser sintering | |
| CN116141557B (en) | Gas cylinder liner and preparation method and application thereof | |
| CN106661234B (en) | Polyamide pellet, method for producing polyamide pellet, and method for producing polyamide molded article | |
| US8309190B2 (en) | Rotational molded article formed from high molecular weight polyamides | |
| JP2015514831A (en) | Method for producing polyamide molded body from polymerizable composition by rotary melting method | |
| CN109320716A (en) | A kind of nylon powder material preparation method applied to selective laser sintering | |
| EP4438654A1 (en) | Materials for powder bed fusion technologies and using such materials in a layer-by-layer process | |
| CN118524925A (en) | Sintered Powder (SP) comprising at least one polyamide MXD6 and at least one semi-crystalline polyamide | |
| JPS58125745A (en) | Plastic tube | |
| JPS6227130A (en) | Manufacture of polyamide film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |