High-strength wear-resistant polyamide material and preparation method thereof

Abstract

The application relates to a high-strength wear-resistant polyamide material and a preparation method thereof, and belongs to the technical field of polyamide materials. The high-strength wear-resistant polyamide material comprises the following raw materials in parts by weight: 65-80 parts of a polyamide matrix material, 0.5-1 part of a lubricating dispersant, 10-15 parts of wear-resistant master batches, 5-8 parts of modified silica sol, 10-15 parts of modified glass fibers and 0.2-0.5 parts of an antioxidant. The application combines self-lubricating property and high hardness by adding a wear-resistant agent which is chemically bonded to the polyamide matrix material, and further adds the modified silica sol and the modified glass fibers as fillers to synergistically improve the wear resistance of the polyamide, so that the polyamide material with high strength and good wear resistance is obtained by the joint action of the other components.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polyamide materials, and relates to a high-strength wear-resistant polyamide material and a preparation method thereof. BACKGROUND

[0002] As a high-performance engineering plastic, polyamide is widely used in the fields of automobile manufacturing, mechanical engineering, electronic appliances, aerospace, etc. due to its excellent mechanical strength, heat resistance and chemical stability. However, the limitations of traditional polyamide materials under extreme working conditions (such as high load, high-speed friction and high-temperature environment) are increasingly prominent, especially the premature failure of parts caused by insufficient wear resistance, which seriously restricts the application potential of polyamide in high-end equipment and precision instruments.

[0003] At present, the improvement of the wear resistance of polyamide materials mainly depends on the addition of inorganic fillers or solid lubricants. Although such methods can improve the wear resistance to a certain extent, similarly, the introduction of excessive fillers easily leads to a decrease in material toughness, causing the risk of brittle fracture; or leads to poor interfacial compatibility, accelerating the microcrack propagation in the wear process; and the traditional blending modification process needs to strictly control the dispersibility of fillers and processing temperature, otherwise it easily causes agglomeration or thermal degradation, resulting in poor product uniformity and low yield.

[0004] Therefore, it is necessary to develop a polyamide material with high strength, long-term wear resistance and process-friendly properties. SUMMARY

[0005] The application aims to provide a high-strength wear-resistant polyamide material and a preparation method thereof. The polyamide material prepared by the application has the characteristics of high strength and good wear resistance.

[0006] The object of the application can be achieved by the following technical solutions.

[0007] A high-strength wear-resistant polyamide material comprises the following raw materials by weight: 65-80 parts of a polyamide matrix material, 0.5-1 part of a lubricating dispersant, 10-15 parts of a wear-resistant master batch, 10-15 parts of modified glass fiber, and 0.2-0.5 parts of an antioxidant, wherein the modified glass fiber is treated with cerium sulfate and a silane coupling agent.

[0008] The preparation process of the wear-resistant master batch is as follows:

[0009] The high-density polyethylene, the wear-resistant agent, the zirconium oxide, the compatibilizer and the lubricant are mixed in a weight ratio of 45-60:10-20:10-15:10-15:1-3, stirred in a high-speed mixer at a rotating speed of 1000 r / min for 60-90 min, and then sheared, plasticized and granulated through a double-screw extruder at 160-190 DEG C to prepare the wear-resistant master batch, wherein the wear-resistant agent is obtained by treating flaky graphite and nano boron nitride.

[0010] The preparation process of the modified silica sol is as follows:

[0011] The nanosilica sol, the hydroxyethyl cellulose, the Tris-HCl buffer solution, the zirconium nitrate solution and the citric acid are added in a weight ratio of 3-5:1-2:5-8:3-5%:0.3-0.5, and the modified silica sol is obtained after stirring.

[0012] As a preferred technical scheme of the present application, the preparation process of the modified glass fiber is as follows:

[0013] S2.1, 5-10 parts of glass fiber and 2-4 parts of dispersant are added in 75-100 parts of deionized water to obtain a mixture A, which is heated to 80-90 DEG C, and the pH value of the mixture A is adjusted to 8-9 by sodium hydroxide, 5-10 parts of cerium sulfate is added, and the mixture is stirred and aged for 1-2 h, and the pH value of the mixture A is adjusted to 8-10 by continuously adding sodium hydroxide, and the temperature is kept for aging for 1-3 h, and solid B is obtained by filtration, washing and drying;

[0014] S2.2, the solid B is sintered at 400-600 DEG C for 3-5 h to obtain cerium oxide coated glass fiber;

[0015] S2.3, the silane coupling agent KH550 is mixed with an ethanol aqueous solution in a volume ratio of 90:10 to obtain a KH550 solution with a mass fraction of 10-15%, and the pH value is adjusted to 6 by acetic acid, and the cerium oxide coated glass fiber is added after uniform stirring, and the stirring is continued for 4-7 h, and the modified glass fiber is prepared by filtration and vacuum drying.

[0016] As a preferred technical scheme of the present application, the preparation process of the wear-resistant agent is as follows:

[0017] S3.1, the hydrogen peroxide, the potassium permanganate, the concentrated sulfuric acid with a mass fraction of 30% and the flaky graphite are mixed in a mass ratio of 3:8:150:100, and stirred at 60-80 DEG C for 8-12 h, and then filtered, washed with deionized water and vacuum dried at 80 DEG C for 24 h to obtain solid C;

[0018] S3.2, soak the nano-boron nitride with 30% nitric acid solution by mass fraction for 5-10 min, filter and then wash with water, then add the nano-boron nitride and hydroxypropanol into ethanol, stir for 5-8 h, filter and wash with clean water to obtain solid D, wherein the mass ratio of hydroxypropanol to nano-boron nitride is 1:10;

[0019] S3.3, stir solid C and solid D in an acid solution at a mass ratio of 1:(5-8) for 5-7 h to obtain the wear-resistant agent.

[0020] As a preferred technical solution of the present application, the lubricating dispersant is one or more of pentaerythritol stearate, ethylene acrylic acid copolymer and polydimethylsiloxane.

[0021] As a preferred technical solution of the present application, the antioxidant is one of antioxidant 1010 and antioxidant 168.

[0022] As a preferred technical solution of the present application, the compatibilizer is one of maleic anhydride grafted polyethylene, ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer.

[0023] As a preferred technical solution of the present application, the lubricant is one of polyethylene wax, silicone and pentaerythritol stearate.

[0024] As a preferred technical solution of the present application, the dispersant is one of polyvinylpyrrolidone and sodium polyacrylate.

[0025] A preparation method of a high-strength wear-resistant polyamide material, comprising the following steps:

[0026] S1, uniformly mix 5-8 parts of modified silica sol and 10-15 parts of modified glass fiber by weight fraction to obtain slurry A;

[0027] S2, stir 65-80 parts of polyamide matrix material and 10-15 parts of wear-resistant master batch at 50-60℃ for 1-2 h, then continue to add slurry A and stir for 30-60 min to obtain slurry B;

[0028] S3, continue to add 0.5-1 parts of lubricating dispersant and 0.2-0.5 parts of antioxidant in slurry B, keep the temperature and continue to mix for 2-3 h, then extrude to obtain the high-strength wear-resistant polyamide material.

[0029] As a preferred technical solution of the present application, the extrusion is carried out in a twin-screw extruder, the barrel temperature is set to 260-280℃, and the rotation speed is 300-500 rpm.

[0030] The polyamide material is prepared by additionally adding wear-resistant master batch and modified glass fiber and modified silica sol to the polyamide base resin, so as to improve the wear resistance and mechanical properties of the polyamide.

[0031] The glass fiber is used as a rigid filler, and a dispersant is added to prevent the agglomeration of the glass fiber and ensure uniform dispersion of the glass fiber in the solution, thereby providing a basis for uniform deposition of the cerium salt in the subsequent process, promoting the hydrolysis of cerium sulfate under alkaline conditions and adsorbing on the surface of the glass fiber, and then through maturation and high-temperature sintering to ensure that the product is fully dehydrated and crystallized to form a stable CeO2 coating layer, while removing residual organic matter. The cerium oxide coating layer can improve the thermal stability, and the stability of CeO2 in an acid-base environment is better than that of bare glass fiber, which can reduce the risk of interfacial corrosion of the polyamide composite in a humid environment. Through silane coupling agent treatment, the interfacial bonding strength between the fiber and the matrix is greatly improved, the CeO2 coating layer blocks the penetration of water molecules, and KH550 reduces the interfacial microcracks, thereby obtaining a high-quality polyamide material.

[0032] The modified glass fiber coated with cerium oxide and treated with a silane coupling agent, compared with directly adding glass fiber, has been fully functionalized before compounding, avoiding the failure of the coupling agent during the processing of the polyamide, and the process stability is higher. And the surface of the uncoated glass fiber only has silanol, and the binding sites of the silane coupling agent are limited, and the coupling agent is easy to form physical adsorption on the surface of the fiber rather than chemical bonding, and the interface between the glass fiber and the polyamide matrix is prone to debonding due to stress concentration, resulting in limited improvement in mechanical properties. The modified glass fiber can improve the wettability and promote uniform dispersion.

[0033] Meanwhile, the modified silica sol provides high specific surface area nano-SiO2 particles as a reinforcing phase to improve the rigidity and strength of the polyamide, avoiding the brittleness defect of traditional micron fillers. By modifying the nano-silica sol, the modified glass fiber is mixed during the preparation of the polyamide material, so that the silica sol and the modified glass fiber raw materials can be better matched in the product system, and the quality of the polyamide is synergistically enhanced.

[0034] In the present application, the scale graphite is carboxylated by treating with an acid solution, and the BN surface is partially exfoliated with 30% HNO3 to form a hydroxylated surface, thereby improving the reaction activity and the dispersibility in the polymer. In the acid solution, the carboxyl group of the oxidized graphite and the hydroxyl group of the hydroxylated boron nitride undergo esterification to form a chemical bonding interface. Meanwhile, the acid environment promotes the electrostatic adsorption and physical entanglement of the graphite and boron nitride, forming a three-dimensional network structure. The scale graphite provides lubricity, and the boron nitride provides high hardness and thermal conductivity, and the two synergistically reduce the wear rate. When the scale graphite and nano boron nitride are directly added, they are only physically adsorbed with the polyamide matrix, and are easy to debond. Through the three-step modification strategy of graphite carboxylation, boron nitride surface activation, and chemical bonding composite, the wear-resistant agent obtained has much higher dispersibility, interface strength, and multifunctional synergy than the untreated graphite and boron nitride directly added, thereby further improving the wear resistance.

[0035] Advantages of the present application:

[0036] The present application further improves the wear resistance of polyamide by adding the chemically bonded wear-resistant agent into the polyamide matrix material, combining self-lubricity with high hardness, and adding modified silica sol and modified glass fiber as fillers to synergistically improve the wear resistance of polyamide. The polyamide material with high strength and good wear resistance is obtained by the combined action of other components. DETAILED DESCRIPTION

[0037] To further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purposes, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0038] In the following examples and comparative examples:

[0039] The polyamide matrix material is PA66101 NC010 from DuPont; the pH of the Tris-HCl buffer solution is 8-10; the high-density polyethylene is purchased from Shanghai Panyue New Material Co., Ltd., and the product code is HYA-600; the zirconium oxide is purchased from Wuhan Jiyexing Chemical Co., Ltd.; the maleic anhydride grafted polyethylene is purchased from Shanghai Maikelin Biochemical Technology Co., Ltd., and the product code is P875047; the polyethylene wax is purchased from Wuhan Canos Technology Co., Ltd., and the brand is Canos; the silica sol is purchased from Ningbo Yutian Material Technology Co., Ltd.; the hydroxyethyl cellulose is purchased from Shanghai Kaisai Chemical Co., Ltd., and the product code is 9004-62-0; the zirconium nitrate is purchased from Wuhan Canos Technology Co., Ltd.; the citric acid is purchased from Shanghai Yuanye Biological Technology Co., Ltd.; the glass fiber is purchased from Wuhan Jixingyibang Biological Technology Co., Ltd., and the product code is 20231115; the sodium polyacrylate is purchased from Shanghai Yuanye Biological Technology Co., Ltd.; the cerium sulfate is purchased from Hubei Yongkong Technology Co., Ltd.; the silane coupling agent KH550 is purchased from Shanghai Yuanye Biological Technology Co., Ltd.; the flake graphite is purchased from Wuhan Jiyexing Chemical Co., Ltd.; the nano boron nitride is purchased from Shanghai Mayre Biochemical Technology Co., Ltd.; the polydimethylsiloxane is purchased from Shanghai Maikelin Biochemical Technology Co., Ltd., and the product code is P822627; the antioxidant 168 is purchased from Shanghai Yinan Chemical Technology Co., Ltd.

[0040] When preparing the modified glass fiber, the alkali used in step S2.1 is sodium hydroxide.

[0041] Example 1

[0042] Preparation of wear-resistant masterbatch:

[0043] 45 parts of high-density polyethylene, 10 parts of wear-resistant agent, 10 parts of zirconium oxide, 10 parts of maleic anhydride grafted polyethylene, and 1 part of polyethylene wax are mixed, stirred in a high-speed mixer at a speed of 1000 r / min for 60 min, and then sheared, plasticized, and granulated by a twin-screw extruder at 160°C to prepare the wear-resistant masterbatch, wherein the wear-resistant agent is flake graphite and nano boron nitride treated.

[0044] Preparation of modified silica sol:

[0045] 3 parts of nano silica sol, 1 part of hydroxyethyl cellulose, 5 parts of Tris-HCl buffer solution, 2 parts of 3% zirconium nitrate solution, and 0.3 parts of citric acid are added, and stirred at a speed of 500 r / min for 3 h to obtain the modified silica sol.

[0046] Preparation of modified glass fiber:

[0047] S2.1, 5 parts of glass fiber and 2 parts of sodium polyacrylate were added in 75 parts of deionized water to obtain a mixture A, heated to 80℃, the pH value of the mixture A was adjusted to 8-9 with alkali, 5 parts of cerium sulfate was added, and stirred and aged for 1h, the pH value of the mixture A was adjusted to 8-10 with alkali, and aged for 1h at the same temperature, and then filtered, washed and dried to obtain solid B;

[0048] S2.2, the solid B was sintered at 400℃ for 3h to obtain cerium oxide coated glass fiber;

[0049] S2.3, silane coupling agent KH550 was mixed with ethanol aqueous solution with a volume ratio of 90:10 to obtain a KH550 solution with a mass fraction of 10%, the pH value was adjusted to 6 with acetic acid, and then the cerium oxide coated glass fiber was added and stirred for 4h, and then filtered and vacuum dried to obtain the modified glass fiber.

[0050] Preparation of wear-resistant agent:

[0051] S3.1, hydrogen peroxide, potassium permanganate, concentrated sulfuric acid with a mass fraction of 30% and flake graphite with a mass ratio of 3:8:150:100 were mixed uniformly, stirred at 60℃ for 8h, filtered and washed with deionized water, and vacuum dried at 80℃ for 24h to obtain solid C;

[0052] S3.2, nano boron nitride was soaked in a 30% nitric acid solution for 5min, filtered and washed with water, and then the nano boron nitride and hydroxypropanol were added into ethanol, stirred at a speed of 500r / min for 5h, filtered and washed with water to obtain solid D, wherein the mass ratio of hydroxypropanol to nano boron nitride was 1:10;

[0053] S3.3, solid C and solid D with a mass ratio of 1:5 were stirred in an acid solution at a speed of 500r / min for 5h to obtain the wear-resistant agent.

[0054] Preparation of high-strength wear-resistant polyamide material:

[0055] S1, 5 parts of modified silica sol and 10 parts of modified glass fiber were mixed uniformly to obtain slurry A;

[0056] S2, 65 parts of polyamide matrix material and 10 parts of wear-resistant master batch were stirred at a speed of 800r / min for 1h at 50℃, and then slurry A was continuously added and stirred for 30min to obtain slurry B;

[0057] S3. Continue to add 0.5 parts of polydimethylsiloxane and 0.2 parts of antioxidant 168 in slurry B, keep the temperature and continue to mix for 2h, extrude, the extrusion is carried out in a twin-screw extruder, the barrel temperature is set to 260℃, and the rotation speed is 300rpm.

[0058] Example 2

[0059] Preparation of wear-resistant masterbatch:

[0060] 50 parts of high-density polyethylene, 15 parts of wear-resistant agent, 13 parts of zirconium oxide, 13 parts of maleic anhydride grafted polyethylene, and 2 parts of polyethylene wax are mixed at a rotation speed of 1000r / min in a high-speed mixer for 70min, and then sheared, plasticized, and granulated in a twin-screw extruder at 180℃ to prepare the wear-resistant masterbatch, wherein the wear-resistant agent is obtained by treating flaky graphite and nano-boron nitride.

[0061] Preparation of modified silica sol:

[0062] 4 parts of nano-silica sol, 1.5 parts of hydroxyethyl cellulose are added to 6 parts of Tris-HCl buffer solution, followed by adding 2.5 parts of 4% zirconium nitrate solution and 0.4 parts of citric acid, and stirring at a rotation speed of 500r / min for 3h to obtain the modified silica sol.

[0063] Preparation of modified glass fiber:

[0064] S2.1. Add 8 parts of glass fiber and 3 parts of sodium polyacrylate to 80 parts of deionized water to obtain a mixture A, heat to 85℃, adjust the pH value of the mixture A to 8-9 with alkali, add 8 parts of cerium sulfate, and stir for 1.5h, continue to adjust the pH value of the mixture A to 8-10 with alkali, keep the temperature and age for 2h, filter, wash, and dry to obtain a solid B;

[0065] S2.2. Sinter the solid B at 500℃ for 4h to obtain cerium oxide coated glass fiber;

[0066] S2.3. Mix silane coupling agent KH550 with a volume ratio of 90:10 of ethanol and water to obtain a KH550 solution with a mass fraction of 13%, adjust the pH to 6 with acetic acid, and then add the cerium oxide coated glass fiber, continue to stir for 6h, filter, and vacuum dry to obtain the modified glass fiber.

[0067] Preparation of wear-resistant agent:

[0068] S3.1, mixing hydrogen peroxide, potassium permanganate, concentrated sulfuric acid with mass fraction of 30% and flake graphite with mass ratio of 3:8:150:100 uniformly, stirring at 70°C for 10h, after finishing, filtering and washing with deionized water, vacuum drying at 80°C for 24h, obtaining solid C;

[0069] S3.2, soaking nano boron nitride with nitric acid solution with mass fraction of 30% for 8min, after filtering and washing with water, adding nano boron nitride and hydroxypropanol into ethanol, stirring at 500r / min for 7h, after filtering and washing with water, obtaining solid D, wherein the mass ratio of hydroxypropanol and nano boron nitride is 1:10;

[0070] S3.3, stirring solid C and solid D with mass ratio of 1:6 in acid solution at 500r / min for 6h, obtaining the wear-resistant agent.

[0071] Preparation of high-strength wear-resistant polyamide material:

[0072] S1, mixing 7 parts of modified silica sol and 13 parts of modified glass fiber uniformly, obtaining slurry A;

[0073] S2, stirring 70 parts of polyamide matrix material and 13 parts of wear-resistant master batch at 55°C for 1.5h, then continuously adding slurry A and stirring for 40min, obtaining slurry B;

[0074] S3, continuously adding 0.8 parts of polydimethylsiloxane and 0.3 parts of antioxidant 168 into slurry B, keeping the temperature and continuously mixing for 2.5h, extruding, obtaining the high-strength wear-resistant polyamide material, wherein the extrusion is carried out in a twin-screw extruder, setting the barrel temperature to 260°C and the rotation speed to 400rpm.

[0075] Example 3

[0076] Preparation of wear-resistant master batch:

[0077] Mixing 60 parts of high-density polyethylene, 20 parts of wear-resistant agent, 15 parts of zirconium oxide, 15 parts of maleic anhydride grafted polyethylene and 3 parts of polyethylene wax by weight, stirring in a high-speed mixer at 1000r / min for 90min, then shearing, plasticizing and granulating in a twin-screw extruder at 190°C, obtaining the wear-resistant master batch, wherein the wear-resistant agent is flake graphite and nano boron nitride after treatment.

[0078] Preparation of modified silica sol:

[0079] 5 parts of nanometer silicon sol, 2 parts of hydroxyethyl cellulose were added into 8 parts of Tris-HCl buffer solution, then 3 parts of 5% zirconium nitrate solution and 0.5 parts of citric acid were added, and stirring was carried out at a rotation speed of 500 r / min for 3 h to obtain the modified silicon sol.

[0080] Preparation of modified glass fiber:

[0081] S2.1, 10 parts of glass fiber and 2-4 parts of sodium polyacrylate were added into 100 parts of deionized water to obtain a mixture A, which was heated to 90°C, and the pH value of the mixture A was adjusted to 8-9 by using alkali, 10 parts of cerium sulfate was added, and stirring and aging were carried out for 2 h, the pH value of the mixture A was continuously adjusted to 8-10 by using alkali, and the temperature was maintained for aging for 3 h, and then filtration, washing and drying were carried out to obtain a solid B;

[0082] S2.2, the solid B was sintered at 600°C for 5 h to obtain the cerium oxide coated glass fiber;

[0083] S2.3, a silane coupling agent KH550 was mixed with an ethanol aqueous solution with a volume ratio of 90:10 to obtain a KH550 solution with a mass fraction of 15%, and the pH value was adjusted to 6 by using acetic acid, and then the cerium oxide coated glass fiber was added after uniform stirring, and the stirring was continuously carried out for 7 h, and then the modified glass fiber was prepared after filtration and vacuum drying.

[0084] Preparation of wear-resistant agent:

[0085] S3.1, hydrogen peroxide, potassium permanganate, concentrated sulfuric acid with a mass fraction of 30% and flake graphite were uniformly mixed in a mass ratio of 3:8:150:100, and stirring was carried out at 80°C for 12 h, and then filtration and washing with deionized water were carried out, and vacuum drying was carried out at 80°C for 24 h to obtain a solid C;

[0086] S3.2, nano boron nitride was soaked in a nitric acid solution with a mass fraction of 30% for 10 min, and then filtration and washing with water were carried out, and then the nano boron nitride and hydroxypropanol were added into ethanol, and stirring was carried out at a rotation speed of 500 r / min for 8 h, and then filtration and washing with water were carried out to obtain a solid D, wherein the mass ratio of hydroxypropanol and nano boron nitride was 1:10;

[0087] S3.3, the solid C and the solid D were mixed in an acid solution in a mass ratio of 1:8 to obtain the wear-resistant agent.

[0088] Preparation of high-strength wear-resistant polyamide material:

[0089] S1, 8 parts of modified silicon sol and 15 parts of modified glass fiber were uniformly mixed to obtain a slurry A;

[0090] S2, 80 parts of polyamide matrix material and 15 parts of wear-resistant master batch were stirred at 60℃ for 2h, then slurry A was continuously added and stirred for 60min to obtain slurry B;

[0091] S3, 1 part of polydimethylsiloxane and 0.5 part of antioxidant 168 were continuously added into slurry B, and the temperature was maintained and mixed for 3h, and then extruded to obtain the high-strength wear-resistant polyamide material, wherein the extrusion was carried out in a double screw extruder, and the barrel temperature was set to 280℃ and the rotation speed was 500rpm.

[0092] Comparative Example 1

[0093] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, the wear-resistant agent is directly mixed with flake graphite and nano boron nitride without any modification treatment, and the rest of the operations are consistent.

[0094] Comparative Example 2

[0095] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, zirconium nitrate is not added in the modified silica sol, and the rest of the operations are consistent.

[0096] Comparative Example 3

[0097] The difference between Comparative Example 3 and Example 1 is that in Comparative Example 3, the modified glass fiber is not treated with cerium sulfate during preparation, and the rest of the operations are consistent.

[0098] Comparative Example 4

[0099] The difference between Comparative Example 4 and Example 1 is that in Comparative Example 4, the modified glass fiber is not treated with KH550 during preparation, and the rest of the operations are consistent.

[0100] Comparative Example 5

[0101] The difference between Comparative Example 5 and Example 1 is that in Comparative Example 5, the glass fiber is not modified, and the rest of the operations are consistent.

[0102] Comparative Example 6

[0103] The difference between Comparative Example 6 and Example 1 is that in Comparative Example 6, the modified silica sol is not added, and the rest of the operations are consistent.

[0104] Performance test:

[0105] Tensile properties: in accordance with GB / T 1040.2-2006;

[0106] Notched impact strength: in accordance with GB / T1043.1-2008;

[0107] Wear resistance: according to standard GB / T3960-2016, the wear amount is tested under the condition of 200N, 200rpm, 120min, the sample size is: 30mm*6mm*7mm, and the test results are as follows Table 1:

[0108] Table 1

[0109]

[0110]

[0111] According to the above data, the polyamide material prepared by the application has excellent strength and wear resistance.

[0112] The above is only a preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above with a preferred embodiment, it is not intended to limit the application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the application, and any equivalent embodiments with equivalent changes and modifications are still within the scope of the technical solution of the application.

Claims

1. A high-strength, wear-resistant polyamide material, characterized in that The polyamide base material, the lubricating dispersant, the wear-resistant master batch, the modified silica sol, the modified glass fiber and the antioxidant are respectively 65-80 parts, 0.5-1 part, 10-15 parts, 5-8 parts, 10-15 parts and 0.2-0.5 part by weight. The preparation process of the wear-resistant master batch is as follows: The high-density polyethylene, the wear-resistant agent, the zirconium oxide, the compatibilizer and the lubricant are mixed by weight, and stirred in a high-speed mixer at a speed of 1000 r / min for 60-90 min, and then sheared, plasticized and granulated by a double-screw extruder at 160-190 DEG C to prepare the wear-resistant master batch, wherein the wear-resistant agent is flake graphite and nano boron nitride treated. The preparation process of the modified silica sol is as follows: The nano silica sol, the hydroxyethyl cellulose, the Tris-HCl buffer solution, the zirconium nitrate solution and the citric acid are added by weight, and stirred to obtain the modified silica sol. The preparation process of the modified glass fiber is as follows: S2.1, 5-10 parts of glass fiber and 2-4 parts of dispersant are added in 75-100 parts of deionized water to obtain a mixture A, and heated to 80-90 DEG C, and the pH value of the mixture A is adjusted to 8-9 by sodium hydroxide, and 5-10 parts of cerium sulfate is added, and stirred for 1-2 h, and the pH value of the mixture A is adjusted to 8-10 by sodium hydroxide, and the temperature is kept for 1-3 h, and then filtered, washed and dried to obtain a solid B; S2.2, the solid B is sintered at 400-600 DEG C for 3-5 h to obtain cerium oxide coated glass fiber; S2.3, the silane coupling agent KH550 is mixed with an ethanol aqueous solution with a volume ratio of 90:10 to obtain a KH550 solution with a mass fraction of 10-15%, and the pH value is adjusted to 6 by acetic acid, and then the cerium oxide coated glass fiber is added and stirred for 4-7 h, and then filtered and vacuum dried to obtain the modified glass fiber; The preparation process of the wear-resistant agent is as follows: S3.1, the hydrogen peroxide, the potassium permanganate, the concentrated sulfuric acid with a mass fraction of 30% and the flake graphite are mixed in a mass ratio of 3:8:150:100, and stirred at 60-80 DEG C for 8-12 h, and then filtered and washed with deionized water, and vacuum dried at 80 DEG C for 24 h to obtain a solid C; S3.2, the nano boron nitride is soaked in a nitric acid solution with a mass fraction of 30% for 5-10 min, and then filtered and washed with water, and then added into ethanol together with hydroxypropanol, and stirred for 5-8 h, and then filtered and washed with water to obtain a solid D, wherein the mass ratio of the hydroxypropanol to the nano boron nitride is 1:10; S3.3, the solid C and the solid D are stirred in an acid solution in a mass ratio of 1:(5-8) for 5-7 h to obtain the wear-resistant agent.

2. The high-strength, wear-resistant polyamide material of claim 1, wherein, The lubricant dispersant is one or more of pentaerythritol stearate, ethylene acrylic acid copolymer and polydimethylsiloxane.

3. The high-strength, abrasion-resistant polyamide material of claim 1, wherein, The antioxidant is one of antioxidant 1010 and antioxidant 168.

4. The high-strength, abrasion-resistant polyamide material of claim 1, wherein, The compatibilizer is one of maleic anhydride grafted polyethylene, ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer.

5. The high-strength abrasion-resistant polyamide material according to claim 1, characterized in that The lubricant is one of polyethylene wax, silicone and pentaerythritol stearate.

6. The high-strength abrasion-resistant polyamide material according to claim 1, characterized in that The dispersant is one of polyvinylpyrrolidone and sodium polyacrylate.

7. A process for the production of a high-strength, wear-resistant polyamide material as claimed in any one of claims 1 to 6, characterized in that The method comprises the following steps: S1, by weight parts, 5-8 parts of modified silica sol is uniformly mixed with 10-15 parts of modified glass fiber to obtain slurry A; S2, 65-80 parts of polyamide matrix material and 10-15 parts of wear-resistant master batch are stirred at 50-60 DEG C for 1-2h, then slurry A is continuously added and stirred for 30-60 min to obtain slurry B; S3, 0.5-1 parts of lubricant dispersant and 0.2-0.5 parts of antioxidant are continuously added in slurry B, the temperature is maintained and mixed for 2-3h, and then extruded to obtain the high-strength wear-resistant polyamide material.

8. The method of producing a high-strength wear-resistant polyamide material according to claim 7, characterized in that, The extrusion is carried out in a double screw extruder, the barrel temperature is set to 260-280 DEG C, and the rotating speed is 300-500 rpm.

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