CN116120736A - Nylon 6 injection molding magnetic material and preparation method thereof - Google Patents
Nylon 6 injection molding magnetic material and preparation method thereof Download PDFInfo
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- CN116120736A CN116120736A CN202111349279.0A CN202111349279A CN116120736A CN 116120736 A CN116120736 A CN 116120736A CN 202111349279 A CN202111349279 A CN 202111349279A CN 116120736 A CN116120736 A CN 116120736A
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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Abstract
The invention provides a nylon 6 injection molding magnetic material and a preparation method thereof. The raw materials of the injection molding magnetic material comprise 75-90 parts of magnetic powder, 8-20 parts of nylon 6, 0-5 parts of low water absorption polymer and 1-2 parts of blocking agent by weight. According to the invention, the blocking agent and the optional low water absorption polymer are added into the nylon 6 injection molding magnetic material system, so that the water absorption rate of the nylon 6 injection molding magnetic material system is effectively reduced, an injection molding product prepared by the magnetic material has better dimensional stability, the preparation process of the injection molding magnetic material is simple, and the nylon 6 injection molding magnetic material system is prepared by adopting conventional blending and extrusion granulation, so that the nylon 6 injection molding magnetic material is convenient for industrialized large-scale application.
Description
Technical Field
The invention relates to the field of magnetic materials, in particular to a nylon 6 injection molding magnetic material and a preparation method thereof.
Background
In recent years, with the progress of microelectronic technology, various electronic products on the market are striving to develop in a small-sized and portable direction. The micro-motor has wide application in various electronic products to meet market demands. At present, materials for producing the micro-special motor in the market are mainly ferrite magnetic powder, and products with various shapes are manufactured by sintering and forming through a traditional method for producing the ferrite magnet. But the sintered magnet can deform in the sintering process, has low yield, low dimensional accuracy, low impact strength and difficult multipolar magnetization, and more importantly, as a motor rotor, the shaft and the magnet cannot be synchronously processed together, and only the shaft and the magnet can be adhered together through the adhesive, so that the workload is increased, and the use performance of the produced rotor is low. The bonded magnet adopts the binder with the density smaller than that of ferrite, so that the bonded ferrite has the density lower than that of the sintered ferrite, thereby being beneficial to the light weight of the whole electric appliance, and simultaneously, the magnet can be sheared randomly due to the action of the binder to be manufactured into various complex shapes; the bonded ferrite has good consistency and high dimensional accuracy, and is convenient for mass production; furthermore, the bonded ferrite is impact-resistant, is not easy to break, is convenient for multi-pole magnetization, and can be formed by one-step machining with a motor rotor shaft. It is the bonded magnet that has many advantages that sintered magnets cannot match, which is popular.
The injection molding magnet is formed by melting, blending, extruding and granulating organic polymer resin and magnetic powder. Common polymer resins include polyamide PA6, PA66, PA12, PA11, PA612 series, polyphenylene sulfide PPS, polyether ether ketone PEEK, etc. with better temperature resistance; the magnetic powder has ferrite (FeO) with lower performance and rare earth magnetic powder with higher performance: neodymium iron boron (Nd-Fe-B), iron nitrogen (Sm-Fe-N), samarium cobalt (Sm-Co), and the like.
The adhesive PA6 has the characteristics of low cost, abundant domestic market reserves and the like, is widely applied to the fields of household appliances, toys and the like, and has much larger application amount than other resin bodies, and accounts for 70-80% of the total market. However, the PA6 has the defects of large water absorption and poor dimensional stability, so that the PA6 is restricted from being applied to the high-end field, such as easy to cause the problem of machine clamping after long-term operation of a motor.
Patent CN111696740a discloses a method for improving hygroscopicity of magnetic composite material, which uses nylon 6 and high-density polyethylene as composite binder, and improves compatibility of the nylon 6 and the high-density polyethylene by controlling granularity of magnetic powder material and matching proper auxiliary agent polyethylene grafted maleic anhydride. Specifically, nylon 6 is adopted for bonding magnetic powder by one-time mixing, the magnetic powder is prepared into magnetic powder with good fluidity by extrusion and crushing, polyethylene is further utilized as a bonding agent for the magnetic powder, the melting temperature difference between nylon 6 and polyethylene is utilized, polyethylene is selected to be coated and extruded at 200-220 ℃, polyethylene is fully melted at the temperature, nylon 6 is not melted yet, polyethylene coating and extrusion are carried out on the magnetic powder at the temperature to form a polyethylene coated magnetic powder particle structure, the method has feasibility in theory, but the control requirement on the temperature in actual operation is very high, the working procedure is complex, two times of granulation and additional multiple times of grinding and crushing are needed, the production cost is high, and the consistency of products is influenced.
The patent CN112048172A discloses a high-temperature resistant low-moisture-absorption nylon-based injection magnetic composite material and a preparation method thereof, wherein the high-temperature resistant performance and the moisture absorption performance of resin are improved by using a polymer-based material with an inorganic filler coated by copolymerized nylon, so that a magnetic filler with magnetism and proper filling are obtained, and the nylon substrate can be fully contacted with a magnetic filler interface by using an optimized coupling agent, so that the compatibility is improved, the filling amount is improved, the maximum magnetic energy product is improved accordingly, and meanwhile, the cohesive energy of the nylon-based injection magnetic composite material is greatly improved by improving the interface adhesiveness, so that the mechanical strength of the nylon-based injection magnetic composite material is ensured while the high-magnetism filler is filled. However, the low water absorption effect on nylon-based injection molded magnetic composites in this patent is poor.
For the above reasons, it is necessary to provide a new nylon 6 injection molding magnet which has low water absorption and thus good dimensional stability of injection molding products, and which is simple in preparation process.
Disclosure of Invention
The invention mainly aims to provide a nylon 6 injection molding magnetic material and a preparation method thereof, which are used for solving the problems of high water absorption rate, unstable product size or complex preparation method of the nylon 6 injection molding magnetic material in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a nylon 6 injection molding magnetic material, wherein the raw materials of the injection molding magnetic material comprise 75 to 90 parts by weight of magnetic powder, 8 to 20 parts by weight of nylon 6, 0 to 5 parts by weight of a low water absorption polymer and 1 to 2 parts by weight of a blocking agent.
Further, the material of the injection molding magnetic material comprises 75-90 parts of magnetic powder, 8-20 parts of nylon 6, 2-5 parts of low water absorption polymer and 1-2 parts of blocking agent according to parts by weight.
Further, the injection molding magnetic material also comprises 0.5 to 1 part of coupling agent and 0.05 to 1 part of lubricant according to the weight parts; more preferably, the injection molding magnetic material comprises 88 to 90 parts by weight of magnetic powder, 7 to 8 parts by weight of nylon 6, 2 to 3 parts by weight of low water-absorbing polymer, 1 to 1.5 parts by weight of blocking agent, 0.5 to 0.8 parts by weight of coupling agent and 0.5 to 0.8 parts by weight of lubricant.
Further, the low water-absorbing polymer is selected from one or more of polypropylene, polytetrafluoroethylene, polytrimethylene terephthalate and MXD6, preferably MXD6.
Further, the barrier agent is an ethylene-vinyl alcohol copolymer; preferably, the ethylene content by weight of the comonomer of the ethylene-vinyl alcohol copolymer is 40 to 60%, more preferably 60%.
Further, the coupling agent is a silane coupling agent, preferably one or more of KH550, KH560 and KH 792; the lubricant is one or more of paraffin, zinc stearate and potassium stearate.
Further, the magnetic powder is ferrite magnetic powder and/or rare earth magnetic powder, preferably ferrite magnetic powder.
According to another aspect of the present invention, there is also provided a method for preparing the nylon 6 injection molding magnetic material, which includes the steps of: and mixing the raw materials of the injection molding magnetic material according to the weight parts, and then extruding and granulating to obtain the nylon 6 injection molding magnetic material.
Further, the preparation method comprises the following steps: mixing and dissolving a coupling agent and an alcohol solvent according to the weight ratio of 1 (5-8) to form a mixed solution; adding the mixed solution into magnetic powder for blending to form pretreated magnetic powder; nylon 6, a low water absorption polymer, a blocking agent and a lubricant are added into the pretreated magnetic powder to be continuously blended to form a blend; extruding and granulating the blend by adopting a double-screw extruder to obtain the nylon 6 injection molding magnetic material.
Further, the temperature of the blending process is 80-120 ℃, and the temperature of extrusion granulation is 220-240 ℃.
The invention provides a nylon 6 injection molding magnetic material, which comprises, by weight, 75-90 parts of magnetic powder, 8-20 parts of nylon 6, 0-5 parts of a low water absorption polymer and 1-2 parts of a blocking agent. According to the invention, the blocking agent and the optional low water absorption polymer are added into the nylon 6 injection molding magnetic material system, so that the water absorption rate of the nylon 6 injection molding magnetic material system is effectively reduced, an injection molding product prepared by the magnetic material has better dimensional stability, the preparation process of the injection molding magnetic material is simple, and the nylon 6 injection molding magnetic material system is prepared by adopting conventional blending and extrusion granulation, so that the nylon 6 injection molding magnetic material is convenient for industrialized large-scale application.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present invention will be described in detail with reference to examples.
As described in the background section, the prior art nylon 6 injection molding magnetic material has high water absorption, unstable product size, or complex preparation method.
In order to solve the problem, the invention provides a nylon 6 injection molding magnetic material which is characterized by comprising 75-90 parts of magnetic powder, 8-20 parts of nylon 6, 0-5 parts of low water absorption polymer and 1-2 parts of blocking agent in parts by weight.
According to the invention, the blocking agent and the optional low water absorption polymer are added into the nylon 6 injection molding magnetic material system, so that the water absorption rate of the nylon 6 injection molding magnetic material system is effectively reduced, an injection molding product prepared by the magnetic material has better dimensional stability, the preparation process of the injection molding magnetic material is simple, and the nylon 6 injection molding magnetic material system is prepared by adopting conventional blending and extrusion granulation, so that the nylon 6 injection molding magnetic material is convenient for industrialized large-scale application.
In the present invention, the low water-absorbing polymer means a polymer having a water absorption lower than that of nylon 6.
For the purpose of further reducing the water absorption of the injection molding magnetic material and thereby further improving the dimensional stability of the injection molded product, in a preferred embodiment, the material of the injection molding magnetic material comprises 75 to 90 parts by weight of magnetic powder, 8 to 20 parts by weight of nylon 6, 2 to 5 parts by weight of a low water absorption polymer and 1 to 2 parts by weight of a blocking agent.
In a preferred embodiment, the injection molded magnetic material further comprises 0.5 to 1 part of a coupling agent and 0.05 to 1 part of a lubricant in parts by weight. The coupling agent and the lubricant are added to be more favorable for the full mixing and compatibility of the components, and the fusion property between the magnetic powder and nylon 6, the low water-absorbing polymer and other components can be further improved in the extrusion process, so that the material distribution is more uniform, and the magnetic property of the final material is better. More preferably, the injection molding magnetic material comprises 88 to 90 parts by weight of magnetic powder, 7 to 8 parts by weight of nylon 6, 2 to 3 parts by weight of low water-absorbing polymer, 1 to 1.5 parts by weight of blocking agent, 0.5 to 0.8 parts by weight of coupling agent and 0.5 to 0.8 parts by weight of lubricant. The weight relation of the components is controlled within the range, which is beneficial to further improving the comprehensive performance of the injection molding magnetic material.
In order to further reduce the water absorption of the injection-molded magnetic material, in a preferred embodiment, the low water absorption polymer is selected from one or more of polypropylene, polytetrafluoroethylene, polytrimethylene terephthalate, MXD6, preferably MXD6.
The barrier agent can form a layer of protective film on the surface of the magnet, so that the corrosion of air and moisture is better isolated, the effect of reducing the water absorption rate is also achieved, and in order to fully exert the effect, better fusion is formed between the barrier agent and other components, and in a preferred embodiment, the barrier agent is an ethylene-vinyl alcohol copolymer; preferably, the ethylene content by weight of the comonomer of the ethylene-vinyl alcohol copolymer is 40 to 60%, more preferably 60%.
In order to provide better fusion between the components, in a preferred embodiment, the coupling agent is a silane coupling agent, preferably one or more of KH550, KH560, KH 792; the lubricant is one or more of paraffin, zinc stearate and potassium stearate.
The magnetic powder may be of a type commonly used in the field of injection molded magnets, and preferably is ferrite magnetic powder and/or rare earth magnetic powder, preferably ferrite magnetic powder.
According to another aspect of the present invention, there is also provided a method for preparing the nylon 6 injection molding magnetic material, which includes the steps of: and mixing the raw materials of the injection molding magnetic material according to the weight parts, and then extruding and granulating to obtain the nylon 6 injection molding magnetic material. In the preparation method, the blocking agent and the optional low water absorption polymer are added into the nylon 6 injection molding magnetic material system, so that the water absorption rate of the nylon 6 injection molding magnetic material system is effectively reduced, an injection molding product prepared by the magnetic material has better dimensional stability, the preparation process of the injection molding magnetic material is simple, blending and extrusion granulation are adopted, and the industrial large-scale application is facilitated.
In order to obtain a better fusion between the components, in a preferred embodiment, the above preparation method comprises the following steps: mixing and dissolving a coupling agent and an alcohol solvent according to the weight ratio of 1 (5-8) to form a mixed solution; adding the mixed solution into magnetic powder for blending to form pretreated magnetic powder; nylon 6, a low water absorption polymer, a blocking agent and a lubricant are added into the pretreated magnetic powder to be continuously blended to form a blend; extruding and granulating the blend by adopting a double-screw extruder to obtain the nylon 6 injection molding magnetic material.
After the coupling agent and the alcohol solvent are mixed and dissolved in advance, the coupling agent and the alcohol solvent are added into the magnetic powder to perform coupling modification on the surface of the magnetic powder more fully, so that the coupling agent and other components are fused better in the subsequent blending and extrusion granulation processes, the dispersion uniformity of the magnetic powder in the magnetic material is improved, and the coupling agent and the alcohol solvent have better promotion effect on the overall performance of the final injection-molded magnet.
Preferably, the alcohol solvent is ethanol and/or isopropanol. More preferably, the weight ratio of the magnetic powder to the alcohol solvent is 1:6.
In a preferred embodiment, the temperature of the above-mentioned blending process is 80 to 120℃and the temperature of extrusion granulation is 220 to 240 ℃. At this temperature, the blending extrusion effect is better, the material uniformity is better, and the performances in all aspects are further improved.
The beneficial effects of the invention are further described by the following examples:
example 1
The various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 45%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, ethylene-vinyl alcohol copolymer and paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for extrusion granulation, and setting the granulation temperature to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured. Example 2
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6 (dupont, usa); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 45%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 3
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6 (dupont, usa); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 45%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 4
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6 (dupont, usa); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 5
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6 (dupont, usa); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 6
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: PP (korea music day H4540); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 7
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: PTT (dupont in the united states,
3301NC 010); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 8
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: PTFE (America mu)
PTFE 7A X); coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 9
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6; coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:5, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 80 ℃, and the mixing time is 90 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 10
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6; coupling agent: KH550; ethylene-vinyl alcohol copolymer: ethylene content 60%; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:5, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 120 ℃, and the powder is mixed for 40 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Example 11
The mass percentages of the various raw materials in this example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6; coupling agent: KH560; ethylene-vinyl alcohol copolymer: ethylene content 60%; zinc stearate;
the process comprises the following steps:
(1) The coupling agent KH560 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water absorption polymer, the ethylene-vinyl alcohol copolymer and the zinc stearate into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured.
Comparative example 1
The mass percentages of the various raw materials in this comparative example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; coupling agent: KH550; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6 and paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured. />
Comparative example 2
The mass percentages of the various raw materials in this comparative example are as follows: magnetic powder: east magnetic powder FA-700K; nylon 6: xinhuimeida M2000; low water-absorbing polymer: MXD6 (dupont, usa); coupling agent: KH550; paraffin wax;
the process comprises the following steps:
(1) The coupling agent KH550 is dissolved in the ethanol, the preparation ratio is 1:6, and then the solution is added into the magnetic powder and is mixed in a high-speed mixing cylinder. The mixing temperature is controlled at 100 ℃, and the mixing time is 60 minutes;
(2) Adding the weighed nylon 6, the low water-absorbing polymer and the paraffin into the magnetic powder treated in the step (1), and continuing to carry out high-speed mixing;
(3) Adding the powder treated in the step (2) into a double-screw extruder for granulation, wherein the granulation temperature is set to be 220-240 ℃.
Pressing the prepared granule into
The cylinder was left to stand at 23℃under 80% humidity for 24 hours, 48 hours, 70 hours, and 240 hours, respectively, and the dimensional change rate was measured. The raw materials of each example and comparative example are shown in Table 1 below in parts by weight and are not shownThe dimensional change rate at the same temperature is shown in Table 2. The granules prepared in different examples and comparative examples were subjected to magnetic property, mechanical property evaluation and flow property evaluation, the magnetic property was tested by IEC 60404-8-1-2004 standard, the strength was tested by ISO178 standard, the fluidity was tested by ISO 1133 standard, and the detailed results are shown in Table 3.
TABLE 1
TABLE 2
TABLE 3 Table 3
From the data, the nylon 6 injection molding magnetic material provided by the invention can effectively reduce the water absorbability on the basis of not affecting other application properties such as magnetic properties, mechanical properties and the like, and has better product dimensional stability and relatively simple preparation process.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111349279.0A CN116120736A (en) | 2021-11-15 | 2021-11-15 | Nylon 6 injection molding magnetic material and preparation method thereof |
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