Motor packaging material and preparation method and application thereof

Abstract

The invention belongs to the technical field of motor packaging, and particularly discloses a motor packaging material and a preparation method and application thereof. The motor packaging material comprises a component A and a component B, the component A is prepared from the following raw materials: a multifunctional epoxy compound, a modified filler, polyether polyol, novolac epoxy resin, urethane acrylate, a toughening agent and a coupling agent; the component B is prepared from the following raw materials: methyl tetrahydrophthalic anhydride, a modified filler, diisocyanate and a curing agent; the modified filler comprises nano aluminum oxide, glass fibers, polyvinylidene fluoride and a silane coupling agent. The motor packaging material disclosed by the invention is excellent in comprehensive performance, has good tensile strength and impact strength, has relatively good heat conduction and heat resistance, is very suitable for preparing a packaged motor, and meets higher and higher requirements of the industry on motor packaging. The invention also provides a preparation method and application of the motor packaging material.

Description

Technical Field

[0001] The present invention relates to the technical field of motor packaging, and in particular to a motor packaging material and a preparation method and application thereof. Background Art

[0002] Motor packaging is an important process in the motor manufacturing process. The packaged motor can reduce motor vibration and noise, improve motor insulation performance, etc. Due to the particularity of the motor working environment and the industry's increasingly high requirements for motor packaging, higher requirements are also placed on the performance of motor packaging materials. The motor packaging material is required to have high thermal conductivity, thereby improving the heat dissipation performance of the packaged motor and reducing the internal stress caused by temperature difference, thereby improving the safety and life of the motor; at the same time, the motor packaging material is required to have good heat resistance and a high glass transition temperature; in addition, the requirements for the mechanical strength and toughness of the motor packaging material are getting higher and higher to cope with more severe working environments and expand the scope of application, reducing the maintenance cost of the motor equipment in the later stage.

[0003] At present, motor packaging materials made of ceramic materials still have the problem of high raw material and processing costs. Research on improving the performance of motor packaging materials often adds various fillers and hardeners to resin materials to improve their thermal conductivity and heat resistance. However, this usually affects the toughness and mechanical strength of the motor packaging materials.

[0004] Therefore, it is necessary to research, develop and improve the current motor packaging materials to improve their thermal conductivity and heat resistance while ensuring they have good toughness and mechanical strength. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a motor packaging material. The motor packaging material of the present invention has high mechanical strength and good toughness, can withstand greater tensile strength and impact strength, and can play a better protective role in complex motor working environments; in addition, the motor packaging material of the present invention has good thermal conductivity and heat resistance, which can better help the motor dissipate heat and improve the safety of motor operation; the present invention achieves a comprehensive improvement in the mechanical strength and thermal conductivity and heat resistance of the motor packaging material, meeting the industry's increasingly high requirements for motor packaging.

[0006] The present invention also provides a method for preparing the motor packaging material.

[0007] The present invention also proposes application of the motor packaging material.

[0008] A first aspect of the present invention provides a motor packaging material, comprising a component A and a component B;

[0009] The raw materials for preparing the A component include: a multifunctional epoxy compound, a modified filler, a polyether polyol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent and a coupling agent;

[0010] The raw materials for preparing the B component include: methyltetrahydrophthalic anhydride, modified filler, diisocyanate and curing agent;

[0011] Wherein, the modified filler comprises nano-alumina, glass fiber, polyvinylidene fluoride and silane coupling agent.

[0012] According to the specific embodiment of the present invention, the motor packaging material provided by the present invention has at least the following beneficial effects: the tensile strength of the motor packaging material of the present invention reaches above 90MPa, and the impact strength reaches 40KJ / m 2 The present invention has the advantages of high glass transition temperature and thermal conductivity. The present invention helps to improve the comprehensive mechanical properties and thermal conductivity and heat resistance of the packaging material by doping the filler with optimized formula and modified treatment in the motor packaging material. The present invention also adds diisocyanate and polyether polyol to the motor packaging material to react and generate a polyurethane component with a complex chain or network structure, which can synergistically enhance the mechanical properties of the material, especially improve the toughness of the packaging material. In addition, by doping with methyltetrahydrophthalic anhydride to play a curing role, it can also further react and cure with phenolic epoxy resin to form a composite structure, which has a dispersing and bonding effect on each component, and helps to improve the comprehensive performance of the packaging material.

[0013] The present invention particularly explores and optimizes the filler of the motor packaging material, and finally finds the above-mentioned filler composed of nano alumina, glass fiber and polyvinylidene fluoride; the use of nano alumina can effectively improve the thermal conductivity and heat resistance of the material, and the modification of nano alumina by silane coupling agent can make it better dispersed and combined in the material, reducing the adverse effect on the strength of the material; the present invention also adds glass fiber and polyvinylidene fluoride into the packaging material after compounding, and the glass fiber can improve the mechanical strength of the packaging material, and the molecular chain formed by polyvinylidene fluoride combined with the glass fiber is cross-linked and entangled with the chain or mesh structure of other composite materials, further improving the toughness of the material, and playing a load balancing role, while improving the strength of the packaging material, it also helps the motor packaging material to cope with the vibration of the motor and reduce noise, prolonging the protection life of the motor packaging material, and the more complex cross-linked mesh structure can better disperse the modified filler. In short, the modified filler used in the present invention has good adaptability with other composite materials of the packaging material, and the comprehensive performance of the motor packaging material is improved.

[0014] According to some embodiments of the present invention, the raw materials for preparing the motor packaging material are calculated by weight, and the component A includes: 35-45 parts of multifunctional epoxy compounds, 40-50 parts of modified fillers, 25-35 parts of polyether polyols, 8-12 parts of phenolic epoxy resins, 4-8 parts of polyurethane acrylates, 4-6 parts of toughening agents, and 4-7 parts of coupling agents; the component B includes: 65-75 parts of methyltetrahydrophthalic anhydride, 40-50 parts of modified fillers, 8-12 parts of diisocyanates, and 6-10 parts of curing agents.

[0015] According to some embodiments of the present invention, the raw materials for preparing the motor packaging material are calculated by weight, and the component A also includes 0.5 to 1.5 parts of an anti-settling agent; and the component B also includes 0.5 to 1.5 parts of an anti-settling agent.

[0016] According to some embodiments of the present invention, the multifunctionality of the multifunctional epoxy compound refers to a functionality ≥ 2, such as difunctionality or trifunctionality.

[0017] According to some embodiments of the present invention, the multifunctional epoxy compound is 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate.

[0018] According to some embodiments of the present invention, the polyether polyol includes a polyether diol or a polyether triol.

[0019] According to some embodiments of the present invention, the polyether polyol is a polyether triol.

[0020] According to some embodiments of the present invention, the polyurethane acrylate is a difunctional aliphatic polyurethane acrylate.

[0021] According to some embodiments of the present invention, the toughening agent is an EPC-205 toughening agent.

[0022] According to some embodiments of the present invention, the coupling agent in the component A is a silane coupling agent.

[0023] According to some embodiments of the present invention, the diisocyanate is diphenylmethane-4,4'-diisocyanate.

[0024] According to some embodiments of the present invention, the anti-settling agent is bentonite.

[0025] After exploration, the present invention found that doping with polyurethane obtained by reacting polyether triol with diisocyanate is more helpful in improving the toughness of motor packaging materials. This may be because it has a more complex cross-linked network structure, which has a more obvious dispersion and binding effect on modified fillers, and better synergistically enhances the strength performance of the packaging material composite.

[0026] According to some embodiments of the present invention, the curing agent is 4.4'-methylene-bis(2-chloroaniline).

[0027] According to some embodiments of the present invention, the modified filler comprises, by mass, 18 to 22 parts of nano-alumina, 8 to 12 parts of glass fiber, 8 to 12 parts of polyvinylidene fluoride and 4 to 6 parts of silane coupling agent.

[0028] According to some embodiments of the present invention, the coupling agent in the component A and the silane coupling agent in the modified filler are independently KH-550 silane coupling agent.

[0029] A second aspect of the present invention provides a method for preparing the motor packaging material according to the first aspect of the present invention, comprising the following steps:

[0030] S1, hydrolyzing the silane coupling agent, adding nano-alumina, heating and stirring, separating the solid to obtain the modified nano-alumina, heating and melting the polyvinylidene fluoride, adding the modified nano-alumina and glass fiber, stirring, cooling, grinding and sieving, and obtaining a modified filler;

[0031] S2, mixing the multifunctional epoxy compound, the polyether polyol, the phenolic epoxy resin, the polyurethane acrylate, the toughening agent and the coupling agent, stirring at room temperature, then adding the modified filler, heating and stirring to obtain component A;

[0032] S3, mixing the methyltetrahydrophthalic anhydride, the diisocyanate and the curing agent, adding the modified filler, heating and stirring, to obtain component B;

[0033] S4, mixing the component A and the component B, pouring them into a mold, heating and curing them, and obtaining a motor packaging material.

[0034] According to a specific embodiment of the present invention, the process flow of the motor packaging material preparation method provided by the present invention is relatively simple and efficient, does not require complex and high-energy consumption equipment, and the various preparation raw materials are relatively cheap, thereby reducing production costs.

[0035] According to some embodiments of the present invention, the method for hydrolyzing the silane coupling agent in step S1 is to add the silane coupling agent to a solvent, and add dropwise glacial acetic acid to adjust the pH to 3 for hydrolysis.

[0036] According to some embodiments of the present invention, the heating and stirring in step S1 is heating to 65-75° C. and stirring for 2-4 hours.

[0037] According to some embodiments of the present invention, the separation of the solid in step S1 further comprises the steps of washing the separated solid with ethanol and drying it.

[0038] According to some embodiments of the present invention, the heating and melting in step S1 is heating to 170-200°C.

[0039] According to some embodiments of the present invention, the sieving in step S1 is sieving through a 10-30 mesh sieve.

[0040] According to some embodiments of the present invention, the heating and stirring in step S2 is heating to 50-60° C. and stirring for 1-3 hours.

[0041] According to some embodiments of the present invention, the heating and stirring in step S3 is heating to 75-85° C. and stirring for 0.5-2 h before adding the modified filler, and heating to 95-105° C. and stirring for 2-4 h after adding the modified filler.

[0042] According to some embodiments of the present invention, an anti-settling agent is added at the same time as the modified filler in the preparation method.

[0043] According to a specific embodiment of the present invention, in step S4, the component A and the component B are mixed in a mass ratio of 1:(0.9-1.2).

[0044] According to a specific embodiment of the present invention, in step S4, the component A and the component B are mixed in a mass ratio of 1:1.

[0045] According to some embodiments of the present invention, the heating curing in step S4 is first heated to 75-85° C., kept warm for 1-3 hours, and then heated to 115-125° C., and kept warm for 10-16 hours.

[0046] The third aspect of the present invention provides the use of the motor packaging material described in the first aspect of the present invention in manufacturing a motor.

[0047] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0049] If the specific conditions are not specified in the specific implementation mode, the conventional conditions or the conditions recommended by the manufacturer are used. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased from the market.

[0050] In the specific embodiment, the multifunctional epoxy compound is E808725, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, CAS No.: 2386-87-0, purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; the polyether triol is N310 polyether triol purchased from Guangzhou Yinghong Chemical Co., Ltd., with a molecular weight of 1000; the polyether diol is N210 polyether diol purchased from Guangzhou Yinghong Chemical Co., Ltd., with a molecular weight of 1000; the polyurethane acrylate is SW2200 difunctional aliphatic polyurethane acrylate purchased from Guangzhou Sanwang Chemical Materials Co., Ltd.; the toughening agent is EPC-205 toughening agent purchased from Luohe High-tech Materials (Shanghai) Co., Ltd.; the anti-settling agent is bentonite, CAS No.: 1302-78-9; methyltetrahydrophthalic anhydride is purchased from Shanghai M91585 6, CAS No.: 19438-64-3; phenolic epoxy resin is phenolic epoxy resin F-51 purchased from Shandong Deyuan Epoxy Technology Co., Ltd.; diisocyanate is diphenylmethane-4,4'-diisocyanate purchased from Jiangsu Bosite Chemical Technology Co., Ltd., CAS No.: 101-68-8; curing agent is M813781, 4.4'-methylene-bis(2-chloroaniline) purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; silane coupling agent is KH-550 silane coupling agent purchased from Guangzhou Zhongjie New Materials Co., Ltd.; nano alumina is A800208 purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; glass fiber is F832297 purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; polyvinylidene fluoride is 768740 purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0051] Example 1

[0052] This embodiment provides a high-performance motor packaging material and a preparation method thereof.

[0053] The raw material composition of the motor packaging material of this embodiment is divided into component A and component B;

[0054] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 30 parts by mass of polyether triol, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0055] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0056] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0057] The steps for preparing the motor packaging material of this embodiment are as follows:

[0058] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0059] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0060] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0061] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0062] The stirring speed is 500 r / min.

[0063] Example 2

[0064] This embodiment provides a high-performance motor packaging material and a preparation method thereof.

[0065] The raw material composition of the motor packaging material of this embodiment is divided into component A and component B;

[0066] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 45 parts of modified filler, 30 parts of polyether diol, 10 parts of phenolic epoxy resin, 5 parts of polyurethane acrylate, 5 parts of toughening agent, 5 parts of silane coupling agent and 1 part of anti-settling agent;

[0067] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 45 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0068] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0069] The steps for preparing the motor packaging material of this embodiment are as follows:

[0070] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0071] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether diol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0072] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0073] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0074] The stirring speed is 500 r / min.

[0075] Example 3

[0076] This embodiment provides a high-performance motor packaging material and a preparation method thereof.

[0077] The raw material composition of the motor packaging material of this embodiment is divided into component A and component B;

[0078] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 40 parts of modified filler, 30 parts of polyether triol, 10 parts of phenolic epoxy resin, 7 parts of polyurethane acrylate, 5 parts of toughening agent, 6 parts of silane coupling agent and 1 part of anti-settling agent;

[0079] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 40 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0080] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0081] The steps for preparing the motor packaging material of this embodiment are as follows:

[0082] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 65°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0083] 2) preparing component A: mixing a multifunctional epoxy compound, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 55° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0084] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, polyether triol and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 105°C while stirring, and stir for 3 hours;

[0085] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 85°C for 3 hours, and then heated to 125°C for 10 hours, and cured to obtain a motor packaging material;

[0086] The stirring speed is 500 r / min.

[0087] Comparative Example 1

[0088] This comparative example provides a motor packaging material and a preparation method thereof.

[0089] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0090] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0091] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 8 parts of curing agent and 1 part of anti-settling agent;

[0092] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0093] The preparation steps of the motor packaging material of this comparative example are as follows:

[0094] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0095] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0096] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0097] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0098] The stirring speed is 500 r / min.

[0099] Comparative Example 2

[0100] This comparative example provides a motor packaging material and a preparation method thereof.

[0101] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0102] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 20 parts of modified filler, 30 parts of polyether triol, 10 parts of phenolic epoxy resin, 5 parts of polyurethane acrylate, 5 parts of toughening agent, 5 parts of silane coupling agent and 1 part of anti-settling agent;

[0103] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 20 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0104] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0105] The preparation steps of the motor packaging material of this comparative example are as follows:

[0106] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0107] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0108] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0109] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0110] The stirring speed is 500 r / min.

[0111] Comparative Example 3

[0112] This comparative example provides a motor packaging material and a preparation method thereof.

[0113] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0114] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 60 parts by mass of modified filler, 30 parts by mass of polyether triol, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0115] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 60 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0116] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0117] The preparation steps of the motor packaging material of this comparative example are as follows:

[0118] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0119] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0120] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0121] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0122] The stirring speed is 500 r / min.

[0123] Comparative Example 4

[0124] This comparative example provides a motor packaging material and a preparation method thereof.

[0125] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0126] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 30 parts by mass of polyether triol, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0127] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0128] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0129] The preparation steps of the motor packaging material of this comparative example are as follows:

[0130] 1) preparing the modified filler: heating polyvinylidene fluoride to 180° C., adding glass fiber and nano-alumina, mixing, stirring for 1 hour, cooling, grinding and passing through a 20-mesh sieve to obtain the modified filler;

[0131] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0132] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0133] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0134] The stirring speed is 500 r / min.

[0135] Comparative Example 5

[0136] This comparative example provides a motor packaging material and a preparation method thereof.

[0137] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0138] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 30 parts by mass of polyether triol, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0139] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0140] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent and 10 parts of polyvinylidene fluoride.

[0141] The preparation steps of the motor packaging material of this comparative example are as follows:

[0142] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0143] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0144] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0145] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0146] The stirring speed is 500 r / min.

[0147] Comparative Example 6

[0148] This comparative example provides a motor packaging material and a preparation method thereof.

[0149] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0150] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 30 parts by mass of polyether triol, 10 parts by mass of phenolic epoxy resin, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0151] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0152] The raw materials of the modified filler are 20 parts of nano-alumina, 5 parts of silane coupling agent and 10 parts of glass fiber in terms of mass.

[0153] The preparation steps of the motor packaging material of this comparative example are as follows:

[0154] 1) preparing the modified filler: adding the silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, separating the solid by centrifugation, washing with anhydrous ethanol for 3 times, and drying to obtain the modified nano-alumina; grinding the glass fiber and the modified nano-alumina together and passing through a 20-mesh sieve to obtain the modified filler;

[0155] 2) preparing component A: mixing a multifunctional epoxy compound, a polyether triol, a phenolic epoxy resin, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stirring at room temperature for 2 hours, then adding a modified filler and an anti-settling agent, heating to 50° C. while stirring, and continuing to stir for 2 hours to obtain component A;

[0156] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0157] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0158] The stirring speed is 500 r / min.

[0159] Comparative Example 7

[0160] This comparative example provides a motor packaging material and a preparation method thereof.

[0161] The raw material composition of the motor packaging material of this comparative example is divided into component A and component B;

[0162] The raw materials of component A are 40 parts by mass of multifunctional epoxy compound, 50 parts by mass of modified filler, 30 parts by mass of polyether triol, 5 parts by mass of polyurethane acrylate, 5 parts by mass of toughening agent, 5 parts by mass of silane coupling agent, and 1 part by mass of anti-settling agent;

[0163] The raw materials of component B are 70 parts by mass of methyltetrahydrophthalic anhydride, 50 parts of modified filler, 10 parts of diisocyanate, 8 parts of curing agent and 1 part of anti-settling agent;

[0164] The raw materials of the modified filler are 20 parts by mass of nano-alumina, 5 parts of silane coupling agent, 10 parts of glass fiber and 10 parts of polyvinylidene fluoride.

[0165] The preparation steps of the motor packaging material of this comparative example are as follows:

[0166] 1) Preparation of modified filler: adding silane coupling agent to 95% ethanol, adding glacial acetic acid dropwise to adjust the pH to 3 for full hydrolysis; then adding nano-alumina, heating to 70°C while stirring, keeping the temperature under reflux and stirring for 3 hours, centrifuging to separate solid, washing with anhydrous ethanol for 3 times, and drying to obtain modified nano-alumina; heating polyvinylidene fluoride to 180°C, adding glass fiber and modified nano-alumina, mixing, stirring for 1 hour, cooling, grinding through a 20-mesh sieve, and obtaining modified filler;

[0167] 2) Preparation of component A: Mix a multifunctional epoxy compound, a polyether triol, a polyurethane acrylate, a toughening agent, and a silane coupling agent, stir at room temperature for 2 hours, then add a modified filler and an anti-settling agent, heat to 50° C. while stirring, and continue stirring for 2 hours to obtain component A;

[0168] 3) Preparation of component B: Mix methyltetrahydrophthalic anhydride, diisocyanate and curing agent, heat to 80°C and stir for 1 hour, then add modified filler and anti-settling agent, heat to 100°C while stirring, and stir for 3 hours;

[0169] 4) Component A and component B are mixed in a mass ratio of 1:1, stirred for 2 hours, poured into a mold, heated to 80°C for 2 hours, and then heated to 120°C for 12 hours, and cured to obtain a motor packaging material;

[0170] The stirring speed is 500 r / min.

[0171] Performance Test:

[0172] The motor packaging materials prepared in the embodiments of the present invention and the comparative examples were subjected to performance tests. The tensile strength of the motor packaging materials was tested with reference to GB / T 1040.2-2022 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics", the impact strength was tested with reference to GB / T 1843-2008 "Standard for determination of cantilever beam impact strength of plastics", the thermal conductivity was tested with reference to GB / T10297-2015 "Hot wire method for determination of thermal conductivity of non-metallic solid materials", and the glass transition temperature (Tg) was tested using differential scanning calorimetry (DSC). The test results are shown in Table 1.

[0173] Table 1 Performance test results of motor packaging materials prepared in the embodiments of the present invention and the comparative examples

[0174]

[0175] The above test results show that the motor packaging material prepared by the scheme of the present invention has good mechanical strength. The tensile strength of the packaging materials prepared in the examples is above 90MPa, and the impact strength is 40KJ / m 2The above, and has a relatively high thermal conductivity, can better dissipate heat for the motor. In addition, compared with the motor packaging material of the comparative example, the embodiment has a higher Tg and better heat resistance.

[0176] In Comparative Example 1, diisocyanate and polyether triol are not used, so the motor packaging material lacks the polyurethane component that plays a toughening role, which makes it difficult for the strength performance of the packaging material, especially the tensile strength, to reach a better value; the amount of modified filler used in Comparative Example 2 is too small, resulting in insufficient improvement in the impact strength, thermal conductivity and heat resistance of the packaging material, making it difficult to prepare a high-performance motor packaging material; and the amount of modified filler in Comparative Example 3 is too high, which may affect the overall adhesion and curing of the material, and also cause a decrease in the mechanical properties of the material. In addition, it will also affect the fluidity of the material before curing, thereby affecting the processing performance of the complex material; in the modified filler of Comparative Example 4, the nano-alumina has not been modified with a silane coupling agent, which may cause it to be separated in the material composite system. The dispersion and bonding properties are significantly deteriorated, which not only leads to a decrease in the toughness of the material, but also affects its improvement in the thermal conductivity of the material; the modified filler in Example 5 lacks glass fiber, and therefore cannot provide sufficient mechanical strength for the packaging material; the modified filler in Example 6 lacks polyvinylidene fluoride, and on the one hand, it cannot be combined with glass fiber to better promote the glass fiber to enhance the mechanical strength of the material, and on the other hand, it lacks the toughness enhancement effect of polyvinylidene fluoride itself and other polymers cross-linked entanglement on the material, resulting in a decrease in the mechanical properties of the packaging material; the component B of Example 7 does not use phenolic epoxy resin, lacks the bonding effect of phenolic epoxy resin and the bonding effect on the components of the composite material, and it is difficult to achieve a better curing effect, resulting in a decrease in the overall performance of the material.

[0177] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A motor packaging material, characterized in that: It includes component A and component B; The raw materials for preparing the A component include: a multifunctional epoxy compound, a modified filler, a polyether polyol, a polyurethane acrylate, a phenolic epoxy resin, a toughening agent and a coupling agent; The raw materials for preparing the B component include: methyltetrahydrophthalic anhydride, modified filler, diisocyanate and curing agent; Wherein, the modified filler comprises nano-alumina, glass fiber, polyvinylidene fluoride and silane coupling agent.

2. The motor packaging material according to claim 1, characterized in that: The raw materials for preparing the motor packaging material are calculated by weight: the component A includes: 35-45 parts of multifunctional epoxy compounds, 40-50 parts of modified fillers, 25-35 parts of polyether polyols, 8-12 parts of phenolic epoxy resins, 4-8 parts of polyurethane acrylates, 4-6 parts of toughening agents and 4-7 parts of coupling agents; the component B includes: 65-75 parts of methyltetrahydrophthalic anhydride, 40-50 parts of modified fillers, 8-12 parts of diisocyanates and 6-10 parts of curing agents.

3. The motor packaging material according to claim 1, characterized in that: The modified filler comprises, by weight, 18 to 22 parts of nano-alumina, 8 to 12 parts of glass fiber, 8 to 12 parts of polyvinylidene fluoride and 4 to 6 parts of silane coupling agent.

4. The motor packaging material according to claim 1, characterized in that: The polyether polyol includes polyether diol or polyether triol.

5. The method for preparing a motor packaging material according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, hydrolyzing the silane coupling agent, adding nano-alumina, heating and stirring, separating the solid to obtain the modified nano-alumina, heating and melting the polyvinylidene fluoride, adding the modified nano-alumina and glass fiber, stirring, cooling, grinding and sieving, and obtaining a modified filler; S2, mixing the multifunctional epoxy compound, the polyether polyol, the phenolic epoxy resin, the polyurethane acrylate, the toughening agent and the coupling agent, stirring at room temperature, then adding the modified filler, heating and stirring to obtain component A; S3, mixing the methyltetrahydrophthalic anhydride, the diisocyanate and the curing agent, adding the modified filler, heating and stirring, to obtain component B; S4, mixing the component A and the component B, pouring them into a mold, heating and curing them, and obtaining a motor packaging material.

6. The preparation method according to claim 5, characterized in that: The solid separation described in step S1 also includes the steps of washing the separated solid with ethanol and drying it.

7. The preparation method according to claim 5, characterized in that: The sieving in step S1 is through a 10-30 mesh sieve.

8. The preparation method according to claim 5, characterized in that: The heating and stirring in step S2 is heating to 50-60° C. and stirring for 1-3 hours.

9. The preparation method according to claim 5, characterized in that: The heating curing described in step S4 is to first heat to 75-85° C., keep warm for 1-3 hours, and then heat to 115-125° C., and keep warm for 10-16 hours.

10. Use of the motor packaging material according to any one of claims 1 to 4 in manufacturing a motor.

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