CN110684337A

CN110684337A - High-performance scratch-resistant polyamide/polyphenyl ether composite material and preparation method thereof

Info

Publication number: CN110684337A
Application number: CN201810723052.XA
Authority: CN
Inventors: 李先红; 兰修才; 曹艳肖; 唐勇
Original assignee: China Bluestar Chengrand Research Institute of Chemical Industry Co Ltd
Current assignee: China Bluestar Chengrand Research Institute of Chemical Industry Co Ltd
Priority date: 2018-07-04
Filing date: 2018-07-04
Publication date: 2020-01-14
Anticipated expiration: 2038-07-04
Also published as: CN110684337B

Abstract

The invention discloses a high-performance scratch-resistant polyamide/polyphenyl ether composite material which comprises the following components in percentage by weight: 20-60% of polyamide resin, 20-60% of polyphenylene oxide resin, 2-30% of aramid fiber, 5-15% of compatilizer, 5-15% of toughening agent and 0.2-0.4% of antioxidant. Firstly, polyamide resin, polyphenyl ether resin, a compatilizer and a flexibilizer are uniformly mixed in stirring equipment; then adding aramid fiber and an antioxidant, and placing the mixture in a mixer to be mixed uniformly; then the mixed materials are put into a double-screw extruder, and the mixture is prepared by melt blending, extrusion and granulation. The composite material is used for manufacturing a stressed friction structural member, and can better meet the requirements of the composite material on wear resistance, heat resistance and mechanical strength, thereby greatly expanding the application range of polyamide/polyphenyl ether alloy.

Description

High-performance scratch-resistant polyamide/polyphenyl ether composite material and preparation method thereof

Technical Field

The invention relates to the field of high polymer materials, in particular to a high-performance scratch-resistant polyamide/polyphenyl ether composite material obtained by modifying aramid fibers and a preparation method thereof.

Background

Polyphenylene Oxide (PPO) belongs to a non-crystalline material, has high heat resistance, stable size, excellent electrical insulation and creep resistance, but has poor processing fluidity, poor organic solvent resistance and poor compatibility with glass fiber; polyamide (PA) belongs to a crystalline material, has good fluidity, organic solvent resistance and good compatibility with aramid fibers, but is easy to absorb water, poor in dimensional stability and poor in heat resistance. Due to the respective defects of the polyamide and the polyphenyl ether, the application range of the polyamide/polyphenyl ether alloy is limited to a certain extent, and the defects of the polyamide and the polyphenyl ether alloy are overcome.

In order to overcome the defects of poor wear resistance and the like of Polyamide (PA)/polyphenylene oxide (PPO) products, the existing improvement method is to compound a wear-resistant agent in an alloy to improve the wear resistance of the alloy, so that the alloy can meet the requirement of mutual friction between a plastic product and metal. For example, CN108034242A discloses a glass fiber reinforced high wear-resistant PA66/PPO composite material and a preparation method thereof, wherein the glass fiber reinforced high wear-resistant PA66/PPO composite material comprises the following raw materials: the composite material comprises, by weight, nylon PA 6620-25 parts, PPO 20-25 parts, a compatilizer 3-5 parts, a wear-resistant agent 3-5 parts, mineral filler 5-10 parts, glass fiber 30-35 parts, an antioxidant 0.1-0.3 part and a lubricant 0.1-0.3 part, and through the synergy and promotion of the raw material components, the wear coefficient of the material is remarkably improved, the mechanical property of the material is improved to a certain extent, the defect that the mechanical property and the wear resistance can not be simultaneously considered in the prior art is overcome, and the formula cost is reduced. However, in order to improve the wear resistance and mechanical properties of the composite material, the raw materials of the composite material contain a large amount of glass fibers besides PPO, and the glass fibers and the wear-resistant agent act synergistically, and the addition of a large amount of glass fibers not only increases the processing difficulty of the material, but also affects the properties of the product.

Aramid fiber is called poly-p-phenylene terephthalamide completely, Aramid fiber is used as English, the Aramid fiber is a novel high-tech synthetic fiber, and has the excellent performances of ultrahigh strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, good wear resistance and the like, the strength of the Aramid fiber is 5-6 times that of a steel wire, the modulus of the Aramid fiber is 2-3 times that of the steel wire or glass fiber, the toughness of the Aramid fiber is 2 times that of the steel wire, the weight of the Aramid fiber is only about 1/5 times that of the steel wire, and the Aramid fiber is not decomposed and not melted at the temperature of 560 ℃. It has good insulating property and ageing resistance, and has long life cycle. Aramid fibers are mainly classified into two types, para-aramid fibers (PPTA) and meta-aramid fibers (PMIA). Aramid fiber is an important national defense and military material, and has been widely applied to various aspects of national economy such as aerospace, electromechanics, buildings, automobiles, sports goods and the like as a fiber material with high technical content besides military application.

The prior published patent documents and the polyamide/polyphenyl ether alloys sold in the market at present have low scratch resistance and mechanical strength, and have the defects of insufficient wear resistance and insufficient heat resistance and mechanical strength when used for manufacturing stressed friction structural parts. By utilizing the excellent performance of the aramid fiber, the wear resistance and the heat resistance of the polyamide/polyphenyl ether alloy are effectively improved, the application of the polyamide/polyphenyl ether alloy in the fields of automobile industry, aerospace industry, petrochemical industry, electromechanical industry, electronic and electrical appliance industry and the like is developed, and the polyamide/polyphenyl ether alloy has wide market space and application prospect. The aramid fiber is used for carrying out wear-resistant enhancement modification on the polyamide/polyphenyl ether alloy, and no relevant report is found at home and abroad.

Disclosure of Invention

In order to overcome the defects of insufficient wear resistance, heat resistance and insufficient mechanical strength of the existing polyamide/polyphenyl ether alloy, the invention aims to provide a high-performance scratch-resistant polyamide/polyphenyl ether composite material obtained by modifying aramid fibers. The composite material is used for manufacturing a stressed friction structural member, and can better meet the requirements of the structure on wear resistance, heat resistance and mechanical strength, thereby expanding the application range of the polyamide/polyphenyl ether alloy in the fields of automobile industry, aerospace industry, petrochemical industry, electromechanical industry, electronic and electrical appliance industry and the like.

The invention is realized by the following technical scheme: a high-performance scratch-resistant polyamide/polyphenylene oxide composite material comprises the following components in percentage by weight:

20 to 60 percent of polyamide resin

20-60% of polyphenyl ether resin

2 to 30 percent of aramid fiber

5 to 15 percent of compatilizer

5 to 15 percent of toughening agent

0.2 to 0.4 percent of antioxidant

The polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.4-3.0 g/dl; Peak-Wash EP158 with a relative viscosity of 2.67g/dl is preferred.

The viscosity of the polyphenylene oxide resin, namely PPO, is 0.35-0.50 g/dl; preferably, the product number of the blue star group is any one of LXR035, LXR038, LXR040, LXR045, LXR048 or LXR 050.

The aramid fiber is aramid 1414 fiber, aramid 1313 fiber or a combination thereof; preferably aramid 1414 fiber produced by medium blue-light, under the trade designation STARAMID F-2.

The compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the self-grafting rate of 1.0-1.7%, and the addition of the compatilizer plays an effective role in enhancing the interfacial compatibility of PPO and PA 66.

Further, the compatibilizer is preferably PPO-g-MAH with a grafting ratio of 1.3%, such as a compatibilizer manufactured by Shenyankotong under the trade name KT-24.

The toughening agent is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 0.8-1.5%, and the toughness and the comprehensive performance of the composite material are effectively improved by adding the toughening agent.

Furthermore, the toughening agent is preferably SEBS-g-MAH with the grafting rate of 1.2 percent, such as a toughening agent with the trade mark of KT-25 produced by Shenyang Ketong.

The antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite; preferably a combination of Irganox1010 and Irganox168, commercially available from Ciba, Inc.

The preparation method of the high-performance scratch-resistant polyamide/polyphenyl ether composite material comprises the following steps:

A. weighing polyamide resin, polyphenyl ether resin, a compatilizer and a flexibilizer according to the weight percentage, and uniformly mixing in stirring equipment;

B. weighing aramid fiber and an antioxidant according to the weight percentage, and then placing the aramid fiber and the antioxidant and the mixed material in the step A into a mixer to be uniformly mixed;

C. and C, putting the mixed material in the step B into a feed hopper of a double-screw extruder, adding the mixed material into the extruder through side feeding, carrying out melt blending through the double-screw extruder, and carrying out extrusion granulation to obtain the polyamide/polyphenyl ether composite material.

In the step C, the processing conditions of extrusion granulation are as follows: the temperature of the first zone of the double-screw extruder is 220-240 ℃, the temperature of the second zone is 230-250 ℃, the temperature of the third zone is 260-270 ℃, the temperature of the fourth zone is 250-270 ℃, the temperature of the head is 260-270 ℃, the retention time is 2-3min, and the pressure is 12-18 MPa.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) on the basis of ensuring the excellent performance of the polyamide/polyphenyl ether alloy, the invention adds 2-30% of aramid fiber, and under the mutual cooperation and coordination of the components, thereby better improving the wear resistance of the polyamide/polyphenyl ether alloy, being used for manufacturing stressed friction structural members, fully meeting the requirements of the stressed friction structural members on wear resistance, heat resistance and mechanical strength, being the polyamide/polyphenyl ether alloy with high strength, high wear resistance and good dimensional stability, and further expanding the application range of the alloy material in the fields of automobile industry, aerospace industry, petrochemical industry, electromechanical industry, electronic and electrical industry and the like.

(2) Compared with patent document CN108034242A, the invention does not need to add glass fiber while adding wear-resistant agent to improve the mechanical properties of the composite material such as tensile strength, bending strength and the like, and only needs to add aramid fiber to simultaneously improve the wear resistance, heat resistance and mechanical strength of the polyamide/polyphenyl ether alloy, and has the advantages of simple operation, easier processing and the like.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

Example 1

A high-performance scratch-resistant polyamide/polyphenyl ether composite material comprises the following components in percentage by weight:

20% of polyamide resin, 40% of polyphenyl ether resin, 20% of aramid fiber, 5% of compatilizer, 14.8% of flexibilizer and 0.2% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.4 g/dl; the viscosity of the polyphenylene ether resin is 0.35 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the self-grafting rate of 1.0 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.0 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

The high-performance scratch-resistant polyamide/polyphenyl ether composite material is prepared by the following steps:

In the step C, the processing conditions of extrusion granulation are as follows: the temperature of a first zone of the double-screw extruder is 220 ℃, the temperature of a second zone is 230 ℃, the temperature of a third zone is 260 ℃, the temperature of a fourth zone is 260 ℃, the temperature of a machine head is 260 ℃, the retention time is 2-3min, and the pressure is 15 MPa.

Example 2

60% of polyamide resin, 20% of polyphenyl ether resin, 2% of aramid fiber, 7.7% of compatilizer, 10% of toughening agent and 0.3% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.7 g/dl; the viscosity of the polyphenylene ether resin is 0.40 g/dl; the aramid fiber is aramid 1313 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.5 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 0.8 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

The preparation method is the same as example 1, wherein in the step C, the processing conditions of extrusion granulation are as follows: the temperature of a first zone of the double-screw extruder is 230 ℃, the temperature of a second zone is 250 ℃, the temperature of a third zone is 270 ℃, the temperature of a fourth zone is 270 ℃, the temperature of a machine head is 260 ℃, the retention time is 2-3min, and the pressure is 12 MPa.

Example 3

25% of polyamide resin, 60% of polyphenyl ether resin, 3.8% of aramid fiber, 6% of compatilizer, 5% of toughening agent and 0.2% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.5 g/dl; the viscosity of the polyphenylene ether resin is 0.48 g/dl; the aramid fiber is a mixture of aramid fiber 1414 and aramid fiber 1313 at a weight ratio of 1: 1; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.7 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.5 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 2: 1.

The preparation method is the same as example 1, wherein in the step C, the processing conditions of extrusion granulation are as follows: the first zone temperature of the double-screw extruder is 240 ℃, the second zone temperature is 240 ℃, the third zone temperature is 260 ℃, the fourth zone temperature is 260 ℃, the head temperature is 270 ℃, the retention time is 2-3min, and the pressure is 16 MPa.

Example 4

23% of polyamide resin, 25% of polyphenyl ether resin, 30% of aramid fiber, 6.6% of compatilizer, 15% of toughening agent and 0.4% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.8 g/dl; the viscosity of the polyphenylene ether resin is 0.45 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.3 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.3 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

The preparation method is the same as example 1, wherein in the step C, the processing conditions of extrusion granulation are as follows: the temperature of a first zone of the double-screw extruder is 230 ℃, the temperature of a second zone is 240 ℃, the temperature of a third zone is 260 ℃, the temperature of a fourth zone is 250 ℃, the temperature of a machine head is 270 ℃, the retention time is 2-3min, and the pressure is 18 MPa.

Example 5

35% of polyamide resin, 25% of polyphenyl ether resin, 15% of aramid fiber, 15% of compatilizer, 9.6% of flexibilizer and 0.4% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.50 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 3.

The preparation method is the same as example 1, wherein in the step C, the processing conditions of extrusion granulation are as follows: the temperature of a first zone of the double-screw extruder is 220 ℃, the temperature of a second zone is 250 ℃, the temperature of a third zone is 260 ℃, the temperature of a fourth zone is 260 ℃, the temperature of a machine head is 260 ℃, the retention time is 2-3min, and the pressure is 13 MPa.

Example 6

44.6% of polyamide resin, 32% of polyphenyl ether resin, 3% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.45 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 3.

Example 7

44.6% of polyamide resin, 30% of polyphenyl ether resin, 5% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.45 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the solubilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

The preparation method is the same as example 1, wherein in the step C, the processing conditions of extrusion granulation are as follows: the first zone temperature of the double-screw extruder is 220 ℃, the second zone temperature is 250 ℃, the third zone temperature is 260 ℃, the fourth zone temperature is 260 ℃, the head temperature is 260 ℃, the residence time is 2-3min, and the pressure is 13MPa

Example 8

44.6% of polyamide resin, 27% of polyphenyl ether resin, 8% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

Example 9

44.6% of polyamide resin, 24% of polyphenyl ether resin, 11% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

Example 10

39.6% of polyamide resin, 24% of polyphenyl ether resin, 15% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

Example 11

40.6% of polyamide resin, 24% of polyphenyl ether resin, 15% of aramid fiber, 10% of compatilizer, 10% of toughening agent and 0.4% of antioxidant;

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.40 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the compatibilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

Example 12

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.48 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the compatibilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

Example 13

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.50 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the compatibilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

Example 14

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.38 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the compatibilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

Example 15

wherein the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.6 g/dl; the viscosity of the polyphenylene ether resin is 0.35 g/dl; the aramid fiber is aramid 1414 fiber; the compatilizer is polyphenylene oxide grafted maleic anhydride (PPO-g-MAH) with the grafting rate of 1.6 percent; the compatibilizer is SEBS grafted maleic anhydride (SEBS-g-MAH) with the grafting rate of 1.2 percent; the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite in a weight ratio of 1: 1.

Comparative example 1

The polyphenylene oxide (PPO) in this comparative example was the same as in examples 6 to 10 and was given under the trade designation LXR 045; the polyamide was PA66 resin (Huafeng EP 158) in the same amounts as in examples 6 to 9. Mixing 35% of PPO (product brand LXR 045), 44.6% of PA66 resin (Huafeng EP 158), 10% of PPO-g-MAH (product brand KT-24) and 10% of SEBS-g-MAH (product brand KT-25) in a stirring device uniformly, and then placing 0.2/0.2% of Irganox1010/Irganox168 and the mixed materials in a mixer for uniformly mixing; and then all the mixed materials are put into a feed hopper of a double-screw extruder, added into the extruder through side feeding, melted and blended by the double-screw extruder, extruded and granulated to obtain the polyamide/polyphenyl ether composite material. Wherein, the temperature setting of each heating area of the extruder is respectively as follows: the temperature of the first zone is 230 ℃, the temperature of the second zone is 250 ℃, the temperature of the third zone is 270 ℃, the temperature of the fourth zone is 260 ℃, the temperature of the machine head is 260 ℃, the retention time is 2-3min, and the pressure is 14 MPa.

Comparative example 2

The polyphenylene oxide (PPO) in this comparative example was the same as in examples 6 to 10 and was given under the trade designation LXR 045; the polyamide is PA66 resin (Huafeng EP 158). Mixing 24% of PPO (product brand LXR 045), 40.6% of PA66 resin (Huafeng EP 158), 10% of PPO-g-MAH (product brand KT-24), 10% of SEBS-g-MAH (product brand KT-25) and 15% of polytetrafluoroethylene (wear-resistant agent) in a stirring device uniformly, and then placing 0.2/0.2% of Irganox1010/Irganox168 and the mixed materials in a mixer for uniformly mixing; and then all the mixed materials are put into a feed hopper of a double-screw extruder, added into the extruder through side feeding, melted and blended by the double-screw extruder, extruded and granulated to obtain the polyamide/polyphenyl ether composite material. Wherein, the temperature setting of each heating area of the extruder is respectively as follows: the temperature of the first zone is 230 ℃, the temperature of the second zone is 250 ℃, the temperature of the third zone is 270 ℃, the temperature of the fourth zone is 260 ℃, the temperature of the machine head is 260 ℃, the retention time is 2-3min, and the pressure is 14 MPa.

And (3) product performance testing: the polyamide/polyphenylene ether composites obtained in examples 1 to 15 and comparative examples 1 to 3 were injection-molded by an injection molding machine to obtain test specimens for mechanical properties, abrasion resistance and thermal deformation properties, and their tensile strength, flexural strength, thermal deformation temperature and friction coefficient were measured according to the relevant standards of ASTM D638, ASTM D790, ASTM D648 and ASTM D3702, respectively. The performance test data is shown in table 1.

Table 1 results of performance testing

Test items	Tensile Strength (MPa)	Flexural Strength (MPa)	Heat distortion temperature (. degree. C.)	Coefficient of friction
					Example 1	100	130.3	120	0.13
Example 2	68.63	92.10	80	0.25
					Example 3	110	140.3	130	0.13
Example 4	68.63	91.10	79	0.25
					Example 5	67.65	93.10	80	0.25
Example 6	68.63	90.10	80	0.25
					Example 7	105	95.5	85	0.17
Example 8	80.5	100.5	90	0.15
					Example 9	85.55	98.5	95	0.13
Example 10	90.56	111.3	101	0.13
					Example 11	90.5	110.3	100	0.16
Example 12	91.5	111.5	100	0.16
					Example 13	92.5	112.3	100	0.16
Example 14	90.1	110	100	0.17
					Example 15	89.55	98.5	95	0.16
Comparative example 1	60	80	75	0.36
					Comparative example 2	65	82	76	0.20

As can be seen from the performance test results in table 1:

first, compared with the comparative example 1, in the examples 1 to 15, the high-performance scratch-resistant polyamide/polyphenylene ether composite material of the invention has greatly improved friction resistance compared with a polyamide/polyphenylene ether alloy, the smaller the friction coefficient represents the self-lubricating capability of the material, the stronger the self-lubricating capability, and the aramid fiber plays a role in enhancing as a fiber, so that the mechanical property and the thermal deformation temperature of the material are greatly improved, thereby greatly expanding the application field of the polyamide/polyphenylene ether composite material and having very practical significance.

Secondly, further, in examples 1 to 15, compared with comparative example 2, although comparative example 2 has a great improvement in abrasion resistance by adding polytetrafluoroethylene as an abrasion resistant agent, and has no great difference from examples 1 to 15, the difference between the mechanical properties (including tensile strength and flexural strength) and the heat distortion temperature is very obvious compared with examples 1 to 15, and the mechanical properties and the abrasion resistance of polyamide/polyphenylene ether cannot be simultaneously considered. In the embodiments 1-15 of the invention, on the basis of PA66 resin (Huafeng EP 158) and PPO resin with the viscosity of 0.35-0.50g/dl, aramid 1414 fiber, aramid 1313 fiber or a combination of the aramid 1414 fiber and the aramid 1313 fiber, and corresponding compatilizer, toughening agent and antioxidant are added, so that the components have good promotion and synergistic effects, the friction resistance of the polyamide/polyphenylene oxide composite material is greatly improved, the requirements of a stressed friction structural member on wear resistance, heat resistance and mechanical strength are fully met, and the application range of the alloy material in the fields of automobile industry, aerospace industry, petrochemical industry, electromechanical industry, electronic and electrical industry and the like is expanded.

Claims

1. A high-performance scratch-resistant polyamide/polyphenylene oxide composite material is characterized by comprising the following components in percentage by weight:

20 to 60 percent of polyamide resin

20-60% of polyphenyl ether resin

2 to 30 percent of aramid fiber

5 to 15 percent of compatilizer

5 to 15 percent of toughening agent

0.2 to 0.4 percent of antioxidant.

2. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the polyamide resin is PA66 resin, and the relative viscosity of the polyamide resin is 2.4-3.0 g/dl.

3. The high-performance scratch-resistant polyamide/polyphenylene ether composite material according to claim 1 or 2, characterized in that: the polyamide resin is selected from warpeak EP 158.

4. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the viscosity of the polyphenylene oxide resin, namely PPO, is 0.35-0.50g/dl, and the polyphenylene oxide resin is selected from any one of the trade marks of LXR035, LXR038, LXR040, LXR045, LXR048 or LXR050 produced by Lanxing group.

5. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the aramid fiber is aramid 1414 fiber, aramid 1313 fiber or a combination thereof.

6. The high-performance scratch-resistant polyamide/polyphenylene ether composite material according to claim 1 or 5, characterized in that: the aramid fiber is selected from aramid 1414 fiber produced by medium-blue-morning light, and the commercial label is STARAMID F-2.

7. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the compatilizer is polyphenylene oxide grafted maleic anhydride PPO-g-MAH with the self-grafting rate of 1.0-1.7%, and the commercial brand is KT-24.

8. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the toughening agent is SEBS grafted maleic anhydride SEBS-g-MAH with the grafting rate of 0.8-1.5%, and the commercial brand is KT-25.

9. The high performance scratch and mar resistant polyamide/polyphenylene ether composite material of claim 1 wherein: the antioxidant is a compound of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butyl) phenyl phosphite.

10. The method for preparing the high-performance scratch-resistant polyamide/polyphenylene ether composite material as claimed in claim 1, which comprises the steps of:

C. b, putting the mixed material in the step B into a feed hopper of a double-screw extruder, adding the mixed material into the extruder through side feeding, carrying out melt blending through the double-screw extruder, and carrying out extrusion granulation to obtain a polyamide/polyphenyl ether composite material;