CN113136101B

CN113136101B - Nylon composite material for realizing high strength by using composite compatilizer and preparation method thereof

Info

Publication number: CN113136101B
Application number: CN202110446110.0A
Authority: CN
Inventors: 张伟; 吴玉成; 徐星驰; 孙圳
Original assignee: Jiangsu Lihan Technology Co ltd
Current assignee: Jiangsu Lihan Technology Co ltd
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-12-23
Anticipated expiration: 2041-04-25
Also published as: CN113136101A

Abstract

The invention discloses a nylon composite material for realizing high strength by using a composite compatilizer and a preparation method thereof, belonging to the technical field of modification of high polymer materials. The composite material comprises nylon, a composite compatilizer and polyphenylene sulfide, wherein the mass ratio of the nylon to the polyphenylene sulfide is (2.1-5.6): 1; the nylon and the polyphenylene sulfide are compatible through a composite compatilizer; the composite compatilizer is a composite graft obtained by melt grafting reaction of polyphenylene sulfide, thermoplastic elastomer X and a grafting monomer, and the polyphenylene sulfide and the thermoplastic elastomer X in the composite graft are connected through chemical bonds. The added polyphenylene sulfide resin can greatly improve the rigidity and hydrophobicity of the nylon material, the compatibility of the polyphenylene sulfide and the nylon can be effectively improved by adding the composite compatilizer, and the hydrophobicity and strength of the composite material are effectively improved from the aspect of improving the compatibility of the polyphenylene sulfide and the nylon.

Description

Nylon composite material for realizing high strength by using composite compatilizer and preparation method thereof

Technical Field

The invention belongs to the technical field of modification of high polymer materials, and particularly relates to a nylon composite material for realizing high strength by using a composite compatilizer and a preparation method thereof.

Background

With the development of lightweight notebook computers, ultra-thin notebook computers have become the mainstream of development. This requires not only redesigning the product structure of the notebook computer, but also optimizing the material due to the structural change. This involves the keyboard.

The keyboard is provided with a plurality of letter or symbol keys, and a supporting framework is arranged below the keys. Before the ultra-thin design is carried out, the supporting framework is manufactured by Polyformaldehyde (POM) materials. After the support skeleton is ultra-thinned, its thickness has been reduced to around 0.6 mm. However, due to the strength of the POM material, the POM cannot meet the use requirements after the design of ultra-thin POM. The designer optimizes the material to a higher strength fiberglass reinforced nylon 66 material. However, the nylon 66 resin has a molecular structure containing hydrophilic amide groups and has strong water absorption, so that the glass fiber reinforced nylon 66 material cannot pass product verification even under a high-temperature and high-humidity environment, and even if the glass fiber content is increased to 50% or more.

Through retrieval, the Chinese invention patent CN111040442A discloses a whisker-reinforced hydrophobic nylon 66 composite material and a preparation method thereof; it specifically discloses through firmly attaching polytetrafluoroethylene that has hydrophobicity on calcium sulfate whisker surface to this disperses in nylon 66 as the filler, and nylon 66's good hydrophobic effect is given to polytetrafluoroethylene's hydrophobicity, and simultaneously, polytetrafluoroethylene firmly wraps on calcium sulfate whisker surface, receives the network dispersion of calcium sulfate whisker fibrous characteristic, can not appear the problem of polytetrafluoroethylene segregation, and the calcium sulfate whisker can effectively increase nylon 66's intensity moreover. Therefore, the composite material is prepared by filling the calcium sulfate whiskers attached with the polytetrafluoroethylene, and the hydrophobicity of the filler is utilized to improve the hydrophobicity of the nylon composite material; however, the composite material only uses the conventional maleic anhydride grafted POE as the compatilizer, so that the low strength of the composite material is probably because the compatibility between the polytetrafluoroethylene and the nylon 66 is not effectively solved, the compatibility between the polytetrafluoroethylene-coated high-strength calcium sulfate whisker and the nylon 66 is poor, and the mechanical properties such as the strength of the prepared composite material are obviously insufficient under the condition of poor compatibility between material components.

For the reasons, it is needed to improve the glass fiber reinforced nylon 66 material, and to design a nylon composite material with high hydrophobicity and high strength to meet the strength requirement in high temperature and high humidity environment.

Disclosure of Invention

1. Problems to be solved

Aiming at the problems of strong water absorption and strength reduction of the nylon composite material in the high-temperature and high-humidity environment in the prior art, the invention provides the nylon composite material for realizing high strength by using the composite compatilizer and the preparation method thereof; the PPS and the thermoplastic elastomer are compounded and grafted with the polar monomer, so that the compatibility between the nylon and the PPS is better improved, the hydrophobicity and the strength of the nylon composite material are effectively improved, and the problems of strong water absorption and low strength in a high-temperature and high-humidity environment are solved.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the invention relates to a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises nylon, the composite compatilizer and polyphenylene sulfide, wherein the mass ratio of the nylon to the polyphenylene sulfide is (2.1-5.6): 1; the nylon and the polyphenylene sulfide are compatible through a composite compatilizer; the composite compatilizer is a composite graft obtained by melt grafting reaction of polyphenylene sulfide, thermoplastic elastomer X and a grafting monomer, and the polyphenylene sulfide and the thermoplastic elastomer X in the composite graft are connected through chemical bonds.

Preferably, the grafting monomer comprises MAH, and MAH in the invention refers to maleic anhydride; the composite compatilizer accounts for 3-6 wt% of the composite material and comprises PPS-X-g-MAH and/or X-PPS-g-MAH and/or MAH-g-X-PPS-g-MAH.

Preferably, the nylon comprises nylon 66, and the nylon 66 is medium-viscosity nylon 66 and/or low-viscosity nylon 66; the molecular weight of the polyphenylene sulfide is 40000-50000.

Preferably, the mass ratio of the polyphenylene sulfide to the thermoplastic elastomer X in the composite compatilizer is (1.4-5.5): 1; the polyphenylene sulfide and the thermoplastic elastomer X in the mass ratio can be matched with the components of nylon and polyphenylene sulfide in the nylon composite material, so that the nylon composite material with higher compatibility can be obtained, and excellent hydrophobicity and strength are embodied.

Preferably, said thermoplastic elastomer X comprises SBS and/or POE and/or EPDM and/or SEBS.

Preferably, the glass fiber treated by the coupling agent is further included, and the mass ratio of the glass fiber to the nylon is (1.16-1.73): 1.

the invention relates to a preparation method of a nylon composite material for realizing high strength by using a composite compatilizer.

Preferably, the specific preparation steps are as follows:

(1) Preparing a composite compatilizer: uniformly mixing 15-85 wt% of PPS, 15-85 wt% of thermoplastic elastomer, 0.1-0.3 wt% of initiator and 1-3 wt% of grafting monomer in a mixer, pouring the mixture into a double-screw extruder for melt extrusion, and then granulating and drying to obtain the composite compatilizer, wherein the processing temperature of each area of the double-screw extruder is 250-295 ℃;

(2) Preparing a composite material: 31.9 to 38.6 weight percent of nylon 66,7 to 15 weight percent of PPS resin, 3 to 6 weight percent of composite compatilizer, 45 to 55 weight percent of glass fiber, 0.1 to 0.3 weight percent of antioxidant and 0.3 to 0.8 weight percent of lubricant are mixed uniformly in a mixer, and then poured into a double-screw extruder for melt extrusion and then granulated and dried to prepare the composite compatilizer, wherein the processing temperature of each area of the double-screw extruder is 255 to 295 ℃.

Preferably, the initiator in step (1) comprises dicumyl peroxide or 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; and/or the diameter of the glass fiber monofilament in the step (2) is 10-13 μm; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant is (1-2): 1; the lubricant is a silicone compound or an amide compound.

Preferably, the processing temperature control of each zone of the twin-screw extruder comprises processing temperature control of one zone to nine zones, wherein the processing temperature control of the one zone to nine zones is 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃ respectively; the head temperature of the twin-screw extruder was 270 ℃.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) The invention relates to a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises nylon, the composite compatilizer and polyphenylene sulfide, wherein the mass ratio of the nylon to the polyphenylene sulfide is (2.1-5.6): 1; the nylon and the polyphenylene sulfide are compatible through a composite compatilizer; the composite compatilizer is a composite graft obtained by melt grafting reaction of polyphenylene sulfide, thermoplastic elastomer X and a grafting monomer, and the polyphenylene sulfide and the thermoplastic elastomer X in the composite graft are connected through chemical bonds. Through the arrangement, the polyphenylene sulfide resin added into the nylon material only contains benzene rings and sulfur atoms in the molecular structure and does not contain amide groups which cause the reduction of the rigidity of the material due to water absorption, so the polyphenylene sulfide resin does not absorb water from the aspect of the molecular structure; in addition, due to the large existence of aromatic benzene rings in the molecular structure of the polyphenylene sulfide, the rigidity of the polyphenylene sulfide is far higher than that of a carbon chain (C-C) in aliphatic nylon; in addition, the proportion of the nylon in the whole material is also reduced by adding part of the polyphenylene sulfide, so that the rigidity and the hydrophobicity of the nylon material can be greatly improved by adding the polyphenylene sulfide resin; furthermore, due to poor compatibility between nylon and polyphenylene sulfide, the composite compatilizer is prepared by mixing polyphenylene sulfide, thermoplastic elastomer X and a grafting monomer for melt grafting reaction, in the melt grafting reaction, the polyphenylene sulfide and the thermoplastic elastomer X can be combined in a chemical bond mode, and the polyphenylene sulfide or the thermoplastic elastomer X can also carry out grafting reaction with the grafting monomer, so that a composite graft of the polyphenylene sulfide, the thermoplastic elastomer X and the grafting monomer is formed, and the hydrophobicity and the strength of the composite material are effectively improved from the perspective of improving the compatibility of the polyphenylene sulfide and the nylon.

(2) The invention relates to a nylon composite material for realizing high strength by utilizing a composite compatilizer, wherein a grafting monomer comprises MAH; the composite compatilizer accounts for 3-6 wt% of the composite material and comprises PPS-X-g-MAH and/or X-PPS-g-MAH and/or MAH-g-X-PPS-g-MAH; the glass fiber treated by the coupling agent is also included, and the mass ratio of the glass fiber to the nylon is (1.16-1.73): 1; the composite compatilizer selected by the invention is a composite graft obtained by mixing PPS resin and thermoplastic elastomer X and then grafting the mixture simultaneously, is different from the common single-component grafting reaction, and forms PPS-X-g-MAH, X-PPS-g-MAH and MAH-g-X-PPS-g-MAH in the grafting reaction process, so that the compatibility between nylon and polyphenylene sulfide resin can be improved, and the MAH can react with a coupling agent on the surface of glass fiber, so that the binding power between the nylon, PPS and glass fiber is further improved, and the mechanical strength and rigidity of the nylon composite material are improved; the initiator is heated and decomposed to generate free radicals, so that hydrogen atoms on molecular chains of the thermoplastic elastomer X and the PPS are captured to form macromolecular free radicals respectively, and the free radicals can be combined with MAH to form a grafting reaction; on the other hand, the thermoplastic elastomer radical and the PPS radical may react with each other to be chemically bonded to form the composite graft.

Detailed Description

The proportion, the size and the like in the specification are only used for matching with the content disclosed in the specification, so that those skilled in the art can understand and read the specification, and do not limit the limit conditions of the implementation of the present invention, so that the present invention has no technical essence, and any structural modification, change of proportion relation or adjustment of size, without affecting the efficacy and the purpose of the present invention, should still fall within the scope covered by the technical content disclosed in the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description only, and are not used to limit the implementable scope, and the relative relationship changes or adjustments may be considered to be within the implementable scope of the present invention without substantial technical changes; in addition, the various embodiments of the present invention are not independent of each other, but may be combined.

The invention is further described with reference to specific examples.

Example 1

The embodiment provides a nylon composite material for realizing high strength by using a composite compatilizer, which comprises the following raw materials in percentage by mass: 36.6wt% of nylon 66 resin, 15wt% of PPS resin, 3wt% of composite compatilizer, 45wt% of glass fiber, 0.1wt% of antioxidant and 0.3wt% of lubricant; the compatilizer comprises the following raw materials in percentage by mass: 13.9wt% of PPS resin, 85wt% of thermoplastic elastomer, 0.1wt% of initiator, 1wt% of graft monomer. The nylon 66 is medium-viscosity nylon 66; the molecular weight of the PPS resin is 40000-50000; the diameter of the glass fiber monofilament is 13 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant to the antioxidant is 1:1; the lubricant is silicone powder; the thermoplastic elastomer is SBS, so the composite compatilizer of the embodiment comprises PPS-SBS-g-MAH, SBS-PPS-g-MAH and MAH-g-SBS-PPS-g-MAH; the initiator is dicumyl peroxide; the grafting monomer is maleic anhydride.

The embodiment also provides a preparation method of the nylon composite material for realizing high strength by using the composite compatilizer, which comprises the following steps: uniformly pre-mixing the dried nylon 66, the PPS resin, the composite compatilizer, the antioxidant and the lubricant in a mixer according to the mass percentage to prepare a premix; then pouring the premix into a main feeding hopper, melting and extruding the premix with a side feeding port and glass fibers in a certain mass percentage by a double-screw extruder, granulating and drying to finally prepare the glass fiber reinforced nylon 66 composite material; the processing temperature control of each zone of the double-screw extruder comprises the processing temperature control of one zone to nine zones, wherein the processing temperature control of the one zone to nine zones is respectively 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃; the head temperature of the twin-screw extruder was 270 ℃.

Example 2

The embodiment provides a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises the following raw materials in percentage by mass: 34.3wt% of nylon 66 resin, 10wt% of PPS resin, 5wt% of composite compatilizer, 50wt% of glass fiber, 0.2wt% of antioxidant and 0.5wt% of lubricant; the composite compatilizer comprises the following raw materials in percentage by mass: 57.8wt% of a PPS resin, 40wt% of a thermoplastic elastomer, 0.2wt% of an initiator, and 2wt% of a graft monomer. The nylon 66 is low-viscosity nylon 66; the molecular weight of the PPS resin is 40000-50000; the diameter of the glass fiber monofilament is 10 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant to the antioxidant is 1:1; the lubricant is TAF; the thermoplastic elastomer is POE, so the composite compatilizer of the embodiment comprises PPS-POE-g-MAH, POE-PPS-g-MAH and MAH-g-POE-PPS-g-MAH; the initiator is dicumyl peroxide; the grafting monomer is maleic anhydride.

The embodiment also provides a preparation method of the nylon composite material for realizing high strength by using the composite compatilizer, which comprises the following steps: uniformly pre-mixing the dried nylon 66, the PPS resin, the composite compatilizer, the antioxidant and the lubricant in a mixer according to the mass percentage requirement to prepare a premix; then pouring the premix into a main feeding hopper, melting and extruding the premix with a side feeding port and glass fibers in a certain mass percentage by a double-screw extruder, granulating and drying to finally prepare the glass fiber reinforced nylon 66 composite material; the processing temperature control of each zone of the double-screw extruder comprises processing temperature control of one zone to nine zones, wherein the processing temperature control of the one zone to nine zones is 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃ respectively; the head temperature of the twin-screw extruder was 270 ℃.

Example 3

The embodiment provides a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises the following raw materials in percentage by mass: 31.9wt% nylon 66 resin, 7wt% PPS resin, 5wt% composite compatibilizer, 55wt% glass fiber, 0.3wt% antioxidant, 0.8wt% lubricant; the composite compatilizer comprises the following raw materials in percentage by mass: 81.7wt% PPS resin, 15wt% thermoplastic elastomer, 0.3wt% initiator, 3wt% graft monomer. The nylon 66 is medium-viscosity nylon 66; the molecular weight of the PPS resin is 40000-50000; the diameter of the glass fiber monofilament is 13 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant to the antioxidant is 1:1; the lubricant is silicone powder; the thermoplastic elastomer is EPDM, so the composite compatilizer comprises PPS-EPDM-g-MAH, EPDM-PPS-g-MAH and MAH-g-EPDM-PPS-g-MAH; the initiator is dicumyl peroxide; the grafting monomer is maleic anhydride.

Example 4

The embodiment provides a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises the following raw materials in percentage by mass: 38.6wt% of nylon 66 resin, 10wt% of PPS resin, 6wt% of composite compatilizer, 45wt% of glass fiber, 0.1wt% of antioxidant and 0.3wt% of lubricant; the composite compatilizer comprises the following raw materials in percentage by mass: 68.9wt% of PPS resin, 30wt% of thermoplastic elastomer, 0.1wt% of initiator, 1wt% of graft monomer. The nylon 66 is medium-viscosity nylon 66; the molecular weight of the PPS resin is 40000-50000; the diameter of the glass fiber monofilament is 13 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant to the antioxidant is 1:1; the lubricant is silicone powder; the thermoplastic elastomer is SEBS, so the composite compatilizer comprises PPS-SEBS-g-MAH, SEBS-PPS-g-MAH and MAH-g-SEBS-PPS-g-MAH; the initiator is 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane; the grafting monomer is maleic anhydride.

The embodiment also provides a preparation method of the nylon composite material for realizing high strength by using the composite compatilizer, which comprises the following steps: uniformly pre-mixing the dried nylon 66, the PPS resin, the composite compatilizer, the antioxidant and the lubricant in a mixer according to the mass percentage to prepare a premix; then pouring the premix into a main feeding hopper, melting and extruding the premix with a side feeding port and glass fibers in a certain mass percentage by a double-screw extruder, granulating and drying to finally prepare the glass fiber reinforced nylon 66 composite material; the processing temperature control of each zone of the double-screw extruder comprises processing temperature control of one zone to nine zones, wherein the processing temperature control of the one zone to nine zones is 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃ respectively; the head temperature of the twin-screw extruder was 270 ℃.

Example 5

The embodiment provides a nylon composite material for realizing high strength by utilizing a composite compatilizer, which comprises the following raw materials in percentage by mass: 33.3wt% of nylon 66 resin, 12wt% of PPS resin, 4wt% of composite compatibilizer, 50wt% of glass fiber, 0.2wt% of antioxidant, 0.5wt% of lubricant; the composite compatilizer comprises the following raw materials in percentage by mass: 37.8% by weight of a PPS resin, 60% by weight of a thermoplastic elastomer, 0.2% by weight of an initiator, and 2% by weight of a graft monomer. The nylon 66 is medium-viscosity nylon 66; the molecular weight of the PPS resin is 40000-50000; the diameter of the glass fiber monofilament is 13 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant is 2:1; the lubricant is silicone powder; the thermoplastic elastomer is SEBS, so the composite compatilizer comprises PPS-SEBS-g-MAH, SEBS-PPS-g-MAH and MAH-g-SEBS-PPS-g-MAH; the initiator is dicumyl peroxide; the grafting monomer is maleic anhydride.

The embodiment also provides a preparation method of the nylon composite material for realizing high strength by using the composite compatilizer, which comprises the following steps: uniformly pre-mixing the dried nylon 66, the PPS resin, the composite compatilizer, the antioxidant and the lubricant in a mixer according to the mass percentage to prepare a premix; then pouring the premix into a main feeding hopper, melting and extruding a side feeding port and glass fibers in a certain mass percentage by a double-screw extruder, and then granulating and drying to finally prepare the glass fiber reinforced nylon 66 composite material; the processing temperature control of each zone of the double-screw extruder comprises processing temperature control of one zone to nine zones, wherein the processing temperature control of the one zone to nine zones is 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃ respectively; the head temperature of the twin-screw extruder was 270 ℃.

Comparative example 1

The comparative example provides a glass fiber reinforced nylon 66 material which comprises the following raw materials in percentage by mass: 44.7 weight percent of nylon 66 resin, 55 weight percent of glass fiber, 0.2 weight percent of antioxidant and 0.5 weight percent of lubricant. The nylon 66 is medium-viscosity nylon 66; the diameter of the glass fiber monofilament is 13 microns; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant to the antioxidant is 1:1; the lubricant is silicone powder;

the preparation method comprises the following steps: the dried nylon 66, the antioxidant and the lubricant are mixed uniformly in advance in a mixer according to the mass percentage to prepare a premix; then pouring the premix into a main feeding hopper, melting and extruding the premix with a side feeding port and glass fibers in a certain mass percentage by a double-screw extruder, granulating and drying to finally prepare the glass fiber reinforced nylon 66 material; the processing temperature control of each zone of the double-screw extruder comprises the processing temperature control of a zone I to a zone nine, wherein the processing temperature control of the zone I to the zone nine is respectively 250 ℃, 260 ℃, 270 ℃, 275 ℃, 270 ℃, 265 ℃ and 260 ℃; the head temperature of the double-screw extruder is 255 ℃.

Comparative example 2

This comparative example provides a glass fibre reinforced nylon 66 material which is substantially the same as example 3 except that: the compatibilizer used in this comparative example was not a composite compatibilizer, but EPDM-g-MAH.

The invention respectively carries out various performance tests on the nylon composite materials prepared in the examples 1-5 and the comparative examples 1-2: the tensile strength, the bending modulus, the notched izod impact strength and the product qualification are verified, and the specific test results are shown in table 1. The test method for the product qualification certification comprises the following steps: various materials are made into a key supporting framework with the thickness of 0.6mm, then the key supporting framework is installed on a keyboard, a vibration experiment, a high-temperature experiment and a low-temperature experiment are sequentially carried out on the keyboard, and whether the operation of keys of the keyboard is abnormal or not is observed after the test is finished, and the keyboard is qualified if the operation is abnormal. Vibration experiment: shaking at-40 deg.C for 5 hr and +60 deg.C for 5 hr, and repeating for 24 cycles; high-temperature test: standing at 60 deg.C and humidity of 60% for 2 hr, standing at 85 deg.C for 2 hr, and standing at room temperature for 30 min; and (3) low-temperature test: standing at 0 deg.C for 2 hr, standing at-20 deg.C for 2 hr, and standing at room temperature for 30 min; and performing key operation on the tested sample assembly.

Performance tests of the nylon composites prepared in Table 1, examples 1 to 5 and comparative examples 1 and 2

It can be seen by comparing examples 1-5 with comparative examples 1 and 2 that the nylon composite material obtained is obviously unqualified in the absence of the composite compatibilizer and PPS of the present invention, wherein the use of a single compatibilizer in comparative example 2 also greatly reduces the tensile strength, flexural strength and flexural modulus of the composite material, as can be seen by comparing the composite material disclosed in CN111040442a in the background art with the present invention; in addition, as can be seen from examples 2 and 3, the tensile strength, flexural modulus, and izod notched impact strength of the composite compatibilizer are all at a high level while ensuring the product to be acceptable, because the composite compatibilizer of examples 2 and 3 has a suitable mass ratio between the polyphenylene sulfide and the thermoplastic elastomer X, which is (1.4-5.5): 1, so that the nylon composite material with high compatibility can be obtained, and the nylon composite material has excellent mechanical properties. In conclusion, the PPS resin and the composite compatilizer are added in proper parts, so that the problem that the rigidity of the nylon composite material is reduced due to water absorption in a high-temperature and high-humidity environment can be effectively solved, particularly, the thin-wall products such as keyboard materials and the like can still keep higher hydrophobicity and strength in a low-temperature and vibration environment, and the application of the nylon composite material is further expanded.

The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description is to be construed as illustrative only and not restrictive, and any such modifications and variations are intended to be included within the scope of the invention as described herein. Furthermore, the background is intended to be illustrative of the present development and significance of the technology and is not intended to limit the invention or the application and field of application of the invention.

More specifically, although exemplary embodiments of the invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments having modifications, omissions, combinations of the various embodiments, adaptations and/or alterations as would be appreciated by those in the art based on the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims

1. The nylon composite material for realizing high strength by using the composite compatilizer is characterized by comprising 31.9-38.6 wt% of nylon, 7-15 wt% of polyphenylene sulfide, 3-6 wt% of the composite compatilizer, 45-55 wt% of glass fiber treated by a coupling agent, 0.1-0.3 wt% of antioxidant and 0.3-0.8 wt% of lubricant, wherein the nylon and the polyphenylene sulfide are compatible through the composite compatilizer; the composite compatilizer comprises 57.8-81.7 wt% of polyphenylene sulfide, 15-40 wt% of thermoplastic elastomer X, 0.1-0.3 wt% of initiator and 1-3 wt% of grafting monomer, the composite compatilizer is a composite graft obtained by carrying out melt grafting reaction on the polyphenylene sulfide, the thermoplastic elastomer X and the grafting monomer, the polyphenylene sulfide and the thermoplastic elastomer X in the composite graft are connected through a chemical bond, the thermoplastic elastomer X is SBS, POE, EPDM or SEBS, and the grafting monomer is MAH.

2. The nylon composite material for realizing high strength by using the composite compatilizer is characterized in that the composite compatilizer comprises PPS-X-g-MAH and/or X-PPS-g-MAH and/or MAH-g-X-PPS-g-MAH according to claim 1.

3. The nylon composite material for realizing high strength by using the composite compatilizer as claimed in claim 1, wherein the nylon comprises nylon 66, and the molecular weight of the polyphenylene sulfide is 40000 to 50000.

4. A method for preparing nylon composite material with high strength by using composite compatilizer, the composite material is the composite material of any one of claims 1~3, and is characterized in that the composite compatilizer is prepared, and then the nylon, the composite compatilizer, the polyphenylene sulfide and the glass fiber treated by the coupling agent are mixed and melt-extruded by a double-screw extruder to prepare the nylon composite material.

5. The preparation method of the nylon composite material for realizing high strength by using the composite compatilizer according to claim 4, which is characterized by comprising the following specific preparation steps:

(1) Preparing a composite compatilizer: uniformly mixing 57.8-81.7 wt% of PPS, 15-40 wt% of thermoplastic elastomer, 0.1-0.3 wt% of initiator and 1-3 wt% of grafting monomer in a mixer, pouring the mixture into a double-screw extruder for melt extrusion, and then granulating and drying to obtain the composite compatilizer, wherein the processing temperature of each zone of the double-screw extruder is 250-295 ℃;

(2) Preparing a composite material: uniformly mixing 31.9-38.6 wt% of nylon 66, 7-15 wt% of PPS resin, 3-6 wt% of composite compatilizer, 45-55 wt% of glass fiber, 0.1-0.3 wt% of antioxidant and 0.3-0.8 wt% of lubricant in a mixer, pouring the mixture into a double-screw extruder for melt extrusion, and then pelletizing and drying to obtain the composite compatilizer, wherein the processing temperature of each area of the double-screw extruder is 255-295 ℃.

6. The method as claimed in claim 5, wherein the initiator used in the step (1) comprises dicumyl peroxide or 2,5-dimethyl-2,5-di (t-butylperoxy) hexane;

the diameter of the glass fiber monofilament in the step (2) is 10-13 mu m; the antioxidant is a mixture of an antioxidant 1098 and an antioxidant S-9228, and the mass ratio of the antioxidant is (1~2): 1; the lubricant is a silicone compound or an amide compound.

7. The method for preparing a nylon composite material with high strength using a composite compatibilizer according to claim 5, wherein the processing temperature control of each zone of the twin-screw extruder comprises processing temperature control of one zone to nine zones, and the processing temperature control of the one zone to nine zones is 255 ℃, 280 ℃, 290 ℃, 295 ℃, 290 ℃, 285 ℃, 280 ℃ and 275 ℃ respectively; the head temperature of the twin-screw extruder was 270 ℃.