WO2023272812A1 - Reinforced wood-plastic coated fiberglass composite profile - Google Patents

Abstract

A reinforced wood-plastic coated fiberglass composite profile, comprising a core material and a coating layer formed on the outer side of the core material. The core material is a fiberglass core material obtained by compound molding of a fiber-reinforced material and a synthetic resin; the coating layer comprises a polyolefin resin and an ionic polymerization resin, wherein the weight fraction of the polyolefin resin is not less than 60%, and the mass fraction of the ionic polymerization resin is 15-30%. The fiberglass composite profile is produced by using a polyolefin-based wood-plastic composite as the coating layer, using fiberglass as the core material, and using an extrusion process; fiberglass is made of the synthetic resin and reinforced fiber, and has greatly improved bonding performance to the polyolefin-based wood-plastic composite as compared with metal, such that the problems of poor bonding between a wood-plastic layer and a metal core material and a large self-weight of a metal material in existing wood-plastic coated metal core material processes are solved to some extent.

Description

A reinforced wood-plastic-coated FRP composite profile technical field

The invention provides a wood-plastic coated FRP composite profile, which relates to the technical field of composite profiles.

Background technique

Profile is a commonly used structural material in the field of construction. In history, people often cut wood into objects with a certain cross-sectional shape and used it as a profile. According to the shape characteristics of the cross-section, the profile can obtain corresponding functions. With the metal smelting With the development of technology, today's profiles usually refer to objects with various cross-sectional shapes obtained by cutting wood or plastically processing aluminum, iron and other metals. Because the physical strength of metal profiles is far superior to that of wooden profiles, they are widely used as load-bearing objects. However, metal profiles have certain defects when they are directly used as building components. From the perspective of aesthetics, metal profiles will bring a stiff feeling, and the reflection of the surface will also affect the vision. On the other hand, metals are prone to acid corrosion. Therefore, wood-plastic materials, such as polyolefin wood-plastic, are used in some processes to coat metal profiles. On the one hand, the outer surface of the metal profile has a wood-like visual effect, and on the other hand, the surface of the metal core material is also treated. protected.

technical problem

Wood-plastic-coated metal profiles have certain defects during use. Commonly used materials such as polyethylene, polyvinyl chloride, and polypropylene for the coating layer have insufficient physical strength, and are prone to scratches and abrasions. In order to solve this problem, people have designed some different schemes, some of which proposed to use sarin resin as the surface material to achieve wear-resistant effects, for example: the patent application number CN201410048917.9 provides a polyolefin coating A co-extruded wood-plastic composite material, the wood-plastic composite material uses sodium-zinc ionized resin, high-density polyethylene and a coupling agent as raw materials to prepare a wear-resistant coating layer. The above-mentioned patented formula has improved the wear resistance of the surface layer to a certain extent, but the content of sodium-zinc ionized resin in the surface layer accounts for more than 95%, and the polyethylene component is only 3%~5%. An ionized resin coating rather than a polyethylene coating, which results in a substantial increase in cost. In addition, due to the weak bonding performance between polyolefin wood-plastic materials and metal, special adhesives are needed to make the surface wood-plastic layer and the inner metal core form a better connection. For example, the patent document whose publication number is CN103209832B discloses an integrally extruded molded body and a building component. This patent uses a copolymer formed by polymerizing an α-olefin and an epoxy-containing unsaturated monomer as an adhesive layer to make the polyolefin The wood plastic is coated on the metal core material. This patent focuses on the adhesiveness between the adhesive layer and the cladding layer, but does not consider the adhesiveness between the adhesive layer and the metal core material. Therefore, in actual use Delamination is prone to occur between the bonding layer and the metal core material.

technical solution

In order to solve the above problems, the present invention provides a wood-plastic-coated FRP composite profile. The present invention uses polyolefin wood-plastic as the cladding layer, glass fiber reinforced plastic as the core material, and adopts an extrusion process to produce the clad profile. It is made of synthetic resin and reinforced fiber, and its bonding performance with polyolefin wood-plastic is greatly improved compared with that of metal, thus to a certain extent, it solves the problem of the connection between the wood-plastic layer and the metal core in the existing wood-plastic clad metal core material process. The core material is not firmly bonded. The invention can produce a composite section bar with imitation wood effect, better surface wear resistance, higher physical strength, simpler production process and lower cost.

The technical scheme that the present invention solves the above problems is as follows:

A reinforced wood-plastic clad FRP composite profile, including a core material and a cladding layer formed outside the core material, the core material is a fiber reinforced plastic core material compositely molded with synthetic resin; the The cladding layer contains polyolefin resin and ion polymer resin, wherein the weight fraction of polyolefin resin is not less than 60%, and the mass fraction of ion polymer resin is 15-30%.

It should be noted that, in the present invention, the coating of the glass fiber reinforced plastic core material by the cladding layer can be full cladding or partial cladding. Taking a strip-shaped profile with a rectangular parallelepiped overall structure as an example, the four outer surfaces of the profile except for the end faces at both ends can be selectively covered according to actual needs. Preferably, the outer periphery of the FRP core material is chosen to be circumferentially clad.

It should also be noted that the FRP core material in the present invention does not specifically refer to composite materials made of glass fibers and synthetic resins. The composite process of reinforcing fiber and synthetic resin initially used glass fiber as a reinforcing material. Due to its high mechanical strength, the fiber-reinforced composite material produced can replace steel and other metals in some fields. called FRP. With the development of fiber reinforcement technology, there are many different fiber materials available, such as carbon fiber, boron fiber, aramid fiber, alumina fiber and silicon carbide fiber, etc., although the fiber reinforced composite produced by using these fibers The material does not contain glass, but it is still called fiberglass due to habit. The diameter of the reinforcing fiber in FRP is very small, generally less than 10 microns, and it is a brittle material, while the synthetic resin matrix has viscoelasticity and elastoplasticity, and is a tough material. performance products.

The manufacturing method of FRP can usually be divided into two types. One is to prepare synthetic resin material into prepolymer rubber, and then use the rubber to impregnate and coat the gauze made of reinforcing fibers, and finally to obtain FRP through shaping and curing steps. material; the other is to pre-stir and mix the reinforcing fiber material and synthetic resin material, and then introduce the mixed material into the mold for shaping and curing to obtain the glass fiber reinforced plastic material. The more commonly used pultrusion process in FRP production belongs to the former category. Specifically, in the pultrusion process, the effect of reinforcing materials (glass fiber roving, glass fiber continuous mat and glass fiber surface mat, etc.) on the traction force of the pultrusion equipment Next, after the dipping tank is fully impregnated with glue, it is guided reasonably by a series of preformed templates to obtain a preliminary shape, and finally enters a heated metal mold, which reacts and solidifies under the action of high temperature of the mold, thereby obtaining a continuous, smooth surface. , Dimensionally stable, high-strength FRP profiles. The advantage of the pultrusion process is that it can be produced continuously and has the highest production efficiency. The latter method is relatively low in production efficiency, and has the advantage of high dispersion of reinforcing materials in the resin, and can produce profiles with complex shapes.

Synthetic resins used in the production of FRP usually include thermosetting resins such as unsaturated polyester resins, epoxy resins, and phenolic resins. These resins have strong stability after curing and are suitable as a matrix for FRP. Unsaturated polyester resin refers to a class of polymers in which the monomers of the synthetic polymer chains are connected through each other and there are unsaturated bonds on the polymer chains. Usually, dibasic acids and diols undergo esterification reactions It is formed by condensation, and there is at least one unsaturated bond in dibasic acid and diol. This type of unsaturated polyester resin is usually prepared by reacting o-phthalic, isophthalic or terephthalic acid with dibasic alcohol. In addition, unsaturated resins also include epoxy acrylate resins, bisphenol A unsaturated polyesters, halogenated unsaturated polyesters, and the like. Phenolic resin refers to a high molecular polymer obtained by polycondensation of phenolic aldehyde and its derivatives. Epoxy resin is a general term for a class of polymers containing more than two epoxy groups in the molecule, usually the polycondensation product of epichlorohydrin and bisphenol A or polyols.

In addition to the above-mentioned synthetic resins and fiber reinforced materials, modified materials and processing aids, such as inorganic fillers, mold release agents, and antioxidants, are usually added in the production of FRP.

The composition of the cladding layer mainly includes polyolefin resin and ionic polymer resin. Since the cladding layer is used as the surface layer, some weather resistance enhancement treatment is required, such as adding antioxidants, light stabilizers, ultraviolet absorbers and other additives. Material. The polyolefin resin here refers to the part of the main chain in the polymer chain that is similar in structure to polyethylene, and the monomers that make up the main chain all have a carbon-carbon double bond structure, such as polyvinyl chloride, polypropylene, polyethylene propylene, etc. , polyvinyl alcohol, etc. Preferably, polyethylene is selected as the polyolefin resin, and the ionomer resin is usually formed by copolymerization of ethylene and methacrylic acid, which has the best compatibility with polyethylene and can be mixed more uniformly during mixing.

The bonding between organic polymers and metals usually includes physical adsorption and chemical adsorption. Due to the low polarity of polyethylene polymers, the physical adsorption between polymer chains and metals is weak, while poly Ethylene polymers lack side chain energy groups, so it is difficult to form strong chemical adsorption with metals. In general, polyethylene polymers are difficult to directly attach to the surface of metal core materials, and adhesives need to be applied to achieve Good fit strength. The core material used in the present invention is made of FRP, and its matrix part is synthetic resin. Compared with metal core materials, polyolefin resin has better compatibility with FRP, so it can form better adhesion. In the case of the agent, better bond strength can also be obtained.

As a preference of the above technical solution, the ionomer resin is selected from one or more of ethylene-methacrylic acid polymer sodium salt and ethylene-methacrylic acid polymer zinc salt. Ionic polymer resin refers to the partial groups on the side chains of the polymer chains that make up the resin are replaced by metal ions to form a resin with ionic properties, such as ethylene methacrylic acid polymer, ethylene acrylic acid polymer, acrylic acid- Sodium or zinc salts of polymers such as ethylene-methacrylic acid terpolymer. The ionic polymer resin used in actual production is represented by sarin resin. Sarin resin is a product obtained by introducing sodium or zinc ions into ethylene-methacrylic acid copolymers for cross-linking. In different ethylene-methacrylic acid copolymers The ionic bonds between the copolymer polymer chains or different regions of the same polymer chain can undergo strong cross-linking, thereby improving the physical properties of ionomer resins, but this cross-linking is reversible. When heated, the phase The strong attraction between adjacent molecules weakens, causing the material to melt and flow, so it has better melt processing properties. When cooling, this bonding is re-established, allowing the ionomer resin to recover its physical strength.

The cladding layer of the present invention is formed with the mass proportion of not less than 60%, preferably 60%~75% polyolefin resin as the matrix material of the cladding layer, and adding 20%~30% ionomer resin cladding body. In the existing process, ionomer resin is usually applied in the form of film or laminated sheet, such as packaging of cheese, fast food and medicine, heat seal layer for extrusion coating foil structure, etc., ionomer resin is usually used as The main constituent material of its layered structure has a relatively high weight ratio. The present invention uses polyolefin resin as the main body and ion polymer resin as the modifying material, so compared with the application method using ion polymer resin as the main material, it has lower cost.

In addition to this, ionomeric resins also have some other properties, such as stain resistance. Ionic polymer resins include a non-polar main chain and extremely polar side chains containing metal ions. The non-polar main chain of the ionic polymer resin is combined with the polyolefin resin towards the inside, and the polar metal ion-containing group is towards the outside to form a polar layer structure. When oil is applied to the surface of the coating layer, the non-polar Due to polar incompatibility, it is difficult for permanent oil stains to adhere to the surface of the coating layer. The improvement of the wear resistance of the coating layer by ion polymer is also related to the above, because the main chain composition of ion polymer resin includes methacrylic acid, and polymethacrylic acid, also known as acrylic, is more Vinyl has higher density and hardness. Due to the interaction between the polyolefin resin and the ionomer resin, the ionomer resin will be oriented to a certain extent on the surface of the cladding layer, thereby forming a surface structure mainly composed of the ionomer resin, which has strong wear resistance Based on polyolefin resin, it can protect the interior. From a physical point of view, the occurrence of wear is essentially the interaction between the surface layers of two objects, so the internal structure does not contribute much to the improvement of the surface wear resistance, so the internal ion polymer resin is replaced by poly Olefin resin does not have a significant impact on wear resistance, but can greatly reduce production costs and obtain higher economic benefits.

In the specific production process, because the existing polyolefin polymer co-extrusion equipment can extrude ionomer resin, so when the raw materials are polyolefin resin and ionomer resin, it can be put into operation without additional improvement to the equipment It is convenient to use and produce and will not lead to an increase in the cost of equipment. However, it should be noted that due to the corrosiveness of ionic polymers to metals, there are some requirements for the material of the extrusion equipment. 4PH and other types of stainless steel.

As a preference of the above technical solution, the thermosetting resin is epoxy resin or phenolic resin with a softening temperature greater than 120°C.

As a preference of the above technical solution, the thickness of the cladding layer is 0.5-5.0 mm.

As another embodiment of the present invention, there is an adhesive layer between the cladding layer and the FRP core material, and the adhesive layer is a hot-melt adhesive layer or a self-adhesive composite polymer layer.

As a preference for the above technical solution, the self-adhesive composite polymer layer includes the following components in parts by mass: 40-60 parts by mass of unsaturated carboxylic acid-modified polyolefin resin, 40-60 parts of thermoplastic polyurethane elastomer, inorganic Filling 5~15.

Through the setting of the adhesive layer, the bonding strength between the cladding layer and the FRP core material can be further strengthened to meet higher quality requirements. The adhesive layer of the present invention adopts unsaturated carboxylic acid modified polyolefin resin and thermoplastic polyurethane elastomer as the main matrix of the adhesive layer, unsaturated carboxylic acid modified polyolefin resin refers to unsaturated carboxylic acid, such as Maleic anhydride is added to the polyolefin polymer chain by grafting, block, etc. to change the polarity of the polyolefin polymer chain and obtain carboxylic acid functional groups. The polymer chains of unsaturated carboxylic acid-modified polyolefin resins and thermoplastic polyurethane elastomers both contain polar main chain parts and non-polar branch chains or functional group parts, and have good properties for items with different polarities. adhesive properties.

As a preference of the above technical solution, an intermediate layer formed of polyolefin wood-plastic material is further provided between the adhesive layer and the covering layer. The polyolefin wood-plastic material here refers to a composite material formed by processing polyolefin resin and plant fiber powder as a matrix. In addition to polyolefin resin and plant fiber powder, polyolefin wood-plastic materials usually include compatibilizers, anti- Various industrial additives such as oxygen agent, and various inorganic fillers such as calcium carbonate and wollastonite. At the same time, polyolefin wood-plastic materials can also include modified resin materials, such as maleic anhydride grafted polyethylene.

Beneficial effect

1. The present invention adds ionic polymer resin to the cladding layer of the composite profile, which improves the wear resistance and scratch resistance of the cladding layer, and also improves the anti-oil performance, making the cladding profile more durable.

2. In the present invention, the metal core material is replaced by the glass fiber reinforced plastic core material, which improves the adhesion between the core material and the cladding layer, so that the investment of adhesives in the production process can be saved, and the effect of simplifying the process and reducing the cost can be realized . Moreover, the density of FRP is much lower than that of metal, and its physical strength in some aspects is comparable to that of metal. Using FRP core material to replace metal core material can greatly reduce the weight of products of the same specification, reduce transportation costs, and facilitate construction.

3. The cladding layer raw material of the present invention can be extruded by existing production equipment without additional investment in equipment improvement, the production process is simple, and the economic benefit is high.

4. The present invention can also be provided with a self-adhesive composite polymer layer between the cladding layer and the metal core material. The adhesive layer has good elasticity and impact resistance, so that it can maintain a relatively high temperature in various environments. Good adhesion; thereby further improving the stability of the product.

Embodiments of the present invention

Preferred embodiments of the present invention will be described below through examples.

In order to facilitate the comparison of the performance of each embodiment and comparative example, the specifications of the FRP core material adopted in each embodiment or comparative example are uniformly 200mm*200mm*2000mm square structure phenolic resin FRP, and the phenolic resin FRP adopts a diameter of 4 ~ 10um Glass fiber is used as a reinforcing fiber, and the inside of the FRP core material has a closed cavity with both ends penetrating through and closed around, and the cross section is square. The thickness of the FRP core material is 5mm.

Example 1

76 parts of polyethylene, 20 parts of ethylene-methacrylic acid sodium salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, After stirring for 15 minutes, the material is discharged, and the mixture is put into granulation for extrusion granulation to obtain surface layer material granules.

Subsequently, the material granules are melted and extruded into a mold with a fiberglass core material through an extruder, and the fiberglass core material is coated to form a coating layer with a thickness of 1.5 mm, wherein the temperature settings of each stage of the extruder It is: feeding section - normal temperature, compression section - 110°C, homogenization section - 180°C, head and die section - 170°C.

Example 2

71 parts of polyethylene, 25 parts of ethylene-methacrylic acid sodium salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, After stirring for 15 minutes, the material is discharged, and the mixture is put into granulation for extrusion granulation to obtain the surface layer material.

Subsequently, the material granules are melted and extruded into a mold with a fiberglass core material through an extruder, and the fiberglass core material is coated to form a coating layer with a thickness of 1.5 mm, wherein the temperature settings of each stage of the extruder It is: feeding section - normal temperature, compression section - 110°C, homogenization section - 180°C, head and die section - 170°C.

Example 3

66 parts of polyethylene, 30 parts of ethylene-methacrylic acid sodium salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, After stirring for 15 minutes, the material is discharged, and the mixture is put into granulation for extrusion granulation to obtain the surface layer material.

Subsequently, the material granules are melted and extruded into a mold with a fiberglass core material through an extruder, and the fiberglass core material is coated to form a coating layer with a thickness of 1.5 mm, wherein the temperature settings of each stage of the extruder It is: feeding section - normal temperature, compression section - 110°C, homogenization section - 180°C, head and die section - 170°C.

Example 4

71 parts of polyethylene, 25 parts of ethylene-methacrylic acid zinc salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, After stirring for 15 minutes, the material is discharged, and the mixture is put into granulation for extrusion granulation to obtain surface layer material granules.

The pretreated FRP core material is introduced into the main channel of the co-extrusion mold. During the process of passing through the channel, the adhesive layer material is melted and extruded to the adhesive layer flow channel by the extruder and coated on the FRP core material. Surroundings, then the surface material particles are melted and extruded to the surface flow channel through the extruder and wrapped around the adhesive layer, and finally form a three-layer structure including the core material and then extruded from the die mouth. In this embodiment, the adhesive layer material is a self-adhesive composite polymer layer.

The composite polymer layer includes the following components in parts by mass: 45 parts of maleic anhydride grafted polyethylene, 45 parts of thermoplastic polyurethane elastomer, and 10 parts of calcium carbonate.

Example 5

71 parts of polyethylene, 15 parts of ethylene-methacrylic acid sodium salt, 10 parts of ethylene-methacrylic acid zinc salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, lubricating 1.6 parts of the agent was used as a raw material in a high-speed mixer, and the material was discharged after stirring for 15 minutes, and the mixture was put into granulation for extrusion granulation to obtain surface layer material granules.

The pretreated FRP core material is introduced into the main channel of the co-extrusion mold. During the process of passing through the channel, the adhesive layer material is melted and extruded to the adhesive layer flow channel by the extruder and coated on the FRP core material. Surroundings, then the surface material is melted and extruded to the surface flow channel through the extruder and wrapped around the adhesive layer, and finally forms a three-layer structure including the core material and then extruded from the die mouth. In this embodiment, the adhesive layer material is a self-adhesive composite polymer layer.

The composite polymer layer includes the following components in parts by mass: 50 parts of maleic anhydride grafted polyethylene, 40 parts of thermoplastic polyurethane elastomer, and 10 parts of calcium carbonate.

Example 6

76 parts of polyethylene, 20 parts of ethylene-methacrylic acid sodium salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, After stirring for 15 minutes, the material is discharged, and the mixture is put into granulation for extrusion granulation to obtain surface layer material granules.

35 parts of wood fiber powder, 3 parts of compatibilizer, 25 parts of high-density polyethylene resin, 15 parts of maleic anhydride grafted polyethylene, 20 parts of calcium carbonate, 4 parts of lubricant, 0.2 parts of anti-oxidation 1010, 0.2 parts of anti-oxidation 168 1 part, 1 part of silane coupling agent is used as a raw material in a high-speed mixer, and the material is discharged after stirring for 15 minutes, and the mixture is put into granulation for extrusion granulation to obtain middle layer material granules.

The pretreated FRP core material is introduced into the main channel of the co-extrusion die. During the process of passing through the channel, the material of the adhesive layer is firstly melted and extruded to the channel of the adhesive layer through the first extruder and coated on the FRP around the core material, then the middle layer material particles are extruded through the second extruder to the middle layer flow channel and coated around the adhesive layer, then the surface layer material particles are melted and extruded into the surface layer flow channel through the third extruder and Wrap around the middle layer, and finally form a four-layer structure including the core material and then extrude from the die. In this embodiment, the adhesive layer material is a self-adhesive composite polymer layer.

The composite polymer layer includes the following components in parts by mass: 50 parts of maleic anhydride grafted polyethylene, 40 parts of thermoplastic polyurethane elastomer, and 10 parts of calcium carbonate.

Comparative example 1

96 parts of polyethylene, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, and 1.6 parts of lubricant are used as raw materials in a high-speed mixer, and the mixture is discharged after stirring for 15 minutes. Throw it into granulation for extrusion granulation to obtain the surface layer material.

Subsequently, the material granules are melted and extruded into a mold with a fiberglass core material through an extruder, and the fiberglass core material is coated to form a coating layer with a thickness of 1.5 mm, wherein the temperature settings of each stage of the extruder It is: feeding section - normal temperature, compression section - 110°C, homogenization section - 180°C, head and die section - 170°C.

Comparative example 2

71 parts of polyethylene, 15 parts of ethylene-methacrylic acid sodium salt, 10 parts of ethylene-methacrylic acid zinc salt, 0.05 parts of carbon black, 0.35 parts of iron red, 0.6 parts of antioxidant, 1.4 parts of anti-ultraviolet absorber, lubricating 1.6 parts of the agent was used as a raw material in a high-speed mixer, stirred for 15 minutes, and discharged, and the mixture was put into granulation for extrusion granulation to obtain the surface layer material.

The core material made of aluminum alloy is selected, the specification of the core material is 200mm*200mm*2000mm, the thickness is 5mm, and the surface has been pre-oxidized.

Subsequently, the material particles are melted and extruded into a mold with an aluminum alloy core material through an extruder, and the aluminum alloy core material is coated to form a cladding layer with a thickness of 1.5mm. The temperature of each stage of the extruder The setting is: feeding section - normal temperature, compression section - 110°C, homogenization section - 180°C, head and die section - 170°C.

The performance test of above-mentioned embodiment and comparative example:

Abrasion resistance test: Using the flat-plate friction wheel test method, the sample is fixed on the rotating table, and the rotating table is equipped with a fixed rubber wheel. When the rotating table rotates, the rubber wheel will rub the sample. Specifically, during the test, the load was 1 kg, the rotation speed was 72 rpm, and the mass retention rate of the sample was analyzed after 5000 rpm to compare the wear resistance. The results are shown in Table 1.

Bonding strength test: test according to the method of GB/T 17657-2013, use HY-914 quick adhesive to stick the steel chuck with the size of 20mm*20mm on the product, and follow the outline of the steel chuck Cut off the adhesive layer, and after the adhesion is firm, use a tension gauge to pull up the steel chuck in the direction perpendicular to the plane of the plate, or place the steel chuck down on the steel chuck to hang a heavy object and record the weight. The gravity of the object, record the maximum tensile force (N) or maximum gravity before the hot melt adhesive and the aluminum alloy sheet are delaminated, and record it as F, then the internal bonding strength is P=F/S, where S is the steel chuck area. The results are shown in Table II.

Table I

Table II

It can be seen from Table 1 and Table 2 that the cladding layer used in the present invention has stronger wear resistance compared with the existing polyethylene wood-plastic cladding layer. When laying the structure, it has a longer service life. Table 2 then shows that after the present invention uses the fiberglass core material to replace the aluminum alloy core material, the direct bonding strength between the clad layer and the core material is greatly improved, reaching a qualified level, and the bonding strength can be further improved after the adhesive layer is adopted. promote.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (10)

A reinforced wood-plastic-coated FRP composite profile, including a core material and a cladding layer formed on the outside of the core material, characterized in that: the core material is a FRP core material compositely formed by fiber reinforced materials and synthetic resins ; The cladding layer includes polyolefin resin and ionomer resin, wherein the weight fraction of polyolefin resin is not less than 60%, and the mass fraction of ionomer resin is 20-30%. According to claim 1, a reinforced wood-plastic-coated FRP profile is characterized in that: in the FRP composite core material, the fiber reinforcement material is selected from glass fiber, carbon fiber, boron fiber, aramid fiber, alumina fiber , one or more of silicon carbide fibers. According to claim 1, a reinforced wood-plastic coated FRP profile is characterized in that: said cladding layer also includes functional additives, said functional additives include antioxidants, light stabilizers and UV absorber. A reinforced wood-plastic-coated FRP profile according to claim 1, characterized in that: the ionomer resin is selected from ethylene-methacrylic acid polymer sodium salt, ethylene-methacrylic acid polymer zinc salt one or more of . A reinforced wood-plastic covered FRP profile according to claim 1, characterized in that: in the FRP composite core material, the synthetic resin is thermosetting resin. The reinforced wood-plastic-coated FRP profile according to claim 5, wherein the thermosetting resin is selected from unsaturated polyester resin, epoxy resin or phenolic resin with a softening temperature greater than 110°C. The reinforced wood-plastic coated FRP profile according to claim 1, characterized in that: the thickness of the cladding layer is 0.5-5.0mm. According to claim 1, a reinforced wood-plastic-coated FRP profile is characterized in that: there is an adhesive layer between the FRP composite core material and the cladding layer, and the middle layer is hot-melt adhesive layer or a self-adhesive composite polymer layer. A reinforced wood-plastic coated FRP profile according to claim 8, characterized in that: the adhesive layer comprises the following components in parts by mass: 50-60 parts by mass of carboxylic acid modified polyethylene, 30 parts by mass of polyurethane elastomer ~40, inorganic filler 5~15. The reinforced wood-plastic-coated FRP profile according to claim 8, characterized in that: an intermediate layer formed of polyolefin wood-plastic material is also arranged between the adhesive layer and the cladding layer.