阅读说明：本技术 一种新能源汽车线束保护套及其制备方法 (New energy automobile wire harness protective sleeve and preparation method thereof ) 是由 王洁 王济绍 于 2019-09-17 设计创作，主要内容包括：本发明提供了一种新能源汽车线束保护套,包括针织网管和涂覆于所述针织网管上的涂层；其中,所述涂层的原料包括以下质量份的组分：橡胶树脂45-52份、苯丙树脂25-42份、抗老化剂1-2份、抗静电剂0.5-2份、碳短切纤维3-9份、玄武岩纤维短切纤维2-6份、玻璃短切纤维1-3份和硫化剂0.5-1份。该新能源汽车线束保护套具有优异的耐高温、耐水和机械性能,具有重要的实用价值,本发明还提供新能源汽车线束保护套的制备方法。(The invention provides a new energy automobile wire harness protective sleeve which comprises a knitted net pipe and a coating coated on the knitted net pipe; the coating comprises the following raw materials in parts by mass: 45-52 parts of rubber resin, 25-42 parts of styrene-acrylic resin, 1-2 parts of anti-aging agent, 0.5-2 parts of antistatic agent, 3-9 parts of carbon chopped fiber, 2-6 parts of basalt chopped fiber, 1-3 parts of glass chopped fiber and 0.5-1 part of vulcanizing agent. The new energy automobile wire harness protection sleeve has excellent high temperature resistance, water resistance and mechanical properties and important practical value, and the invention further provides a preparation method of the new energy automobile wire harness protection sleeve.)

1. The new energy automobile wire harness protective sleeve is characterized by comprising a knitted net pipe and a coating coated on the knitted net pipe; the coating comprises the following raw materials in parts by mass: 45-52 parts of rubber resin, 25-42 parts of styrene-acrylic resin, 1-2 parts of anti-aging agent, 0.5-2 parts of antistatic agent, 3-9 parts of carbon chopped fiber, 2-6 parts of basalt chopped fiber, 1-3 parts of glass chopped fiber and 0.5-1 part of vulcanizing agent.

2. The new energy automobile wire harness protective sleeve according to claim 1, wherein the rubber resin and the styrene-acrylic resin are both uncrosslinked resin prepolymers.

3. The new energy automobile wire harness protective sleeve as claimed in claim 2, wherein the rubber resin is ethylene propylene diene monomer rubber resin, isoprene rubber resin or nitrile rubber resin.

4. The new energy automobile wire harness protective sleeve as claimed in claim 3, wherein the vulcanizing agent is vinyltrimethoxysilane, or Fe (OH) ₃, triethanolamine, or ethylene thiourea, pentaerythritol tetraethylene ester, or a combination of ethylene thiourea and benzimidazole derivatives.

5. The new energy automobile wire harness protective sleeve according to any one of claims 1 to 4, wherein the solid content of the styrene-acrylic resin is 38% to 43%, the styrene-acrylic resin is polymerized from styrene, acrylic acid, methyl methacrylate and a crosslinking monomer, and the crosslinking monomer is glycidyl methacrylate, N-N-butyl (iso) oxymethylacrylamide, acetoacetoxy ethyl methacrylate or glycidyl methacrylate.

6. The new energy automobile wire harness protective sleeve according to any one of claims 1-4, wherein the thickness of the protective sleeve is 2-4 mm; the length-diameter ratio of the carbon chopped fibers, the basalt chopped fibers and the glass chopped fibers is 2-13, and the length of the carbon chopped fibers, the basalt chopped fibers and the glass chopped fibers is smaller than the thickness of the protective sleeve.

7. The new energy automobile wire harness protective sleeve according to claim 6, wherein the knitted mesh tube is made of aramid fiber and has a warp and weft density of (10-15) x (10-15), wherein the diameter of the aramid fiber is 5-8 μm.

8. The preparation method of the new energy automobile wire harness protective sleeve of any one of claims 1 to 7, which comprises the following steps:

Mixing the rubber resin, the styrene-acrylic resin and the vulcanizing agent at a low temperature, adding the anti-aging agent, the antistatic agent, the carbon chopped fibers, the basalt fiber chopped fibers and the glass chopped fibers, and granulating to obtain mixture particles; and putting the mixture particles and the knitted mesh pipe into a mold, injecting supercritical fluid for permeation and swelling to achieve diffusion balance, heating and releasing pressure to enable the mixture particles to be foamed and permeate and bond with the knitted mesh pipe, carrying out compression molding, cooling and taking out to obtain the new energy automobile wire harness protective sleeve.

9. The preparation method of the wire harness protective sleeve of the new energy automobile as claimed in claim 8, wherein the low-temperature mixing temperature is 50-60 ℃, the supercritical fluid foaming method adopts CO ₂ or N ₂ fluid, the temperature is 110-120 ℃, the pressure of the supercritical fluid is 3.5-15 MPa, the pressure release speed is 3-4 MPa/min, and the heating temperature in the mold is 150-160 ℃.

Technical Field

The invention belongs to automobile parts, and particularly relates to a new energy automobile wire harness protective sleeve and a preparation method thereof.

Background

The wire harness is a component in which a contact terminal (connector) punched from a copper material is crimped with an electric wire and cable, and then an insulator is molded or a metal case is added to the exterior of the contact terminal, so that a connection circuit is formed by bundling the contact terminal and the cable with the wire harness. The new energy automobile wire harness is a network main body of a circuit of the new energy automobile wire harness, and the wire harness is directly exposed in a humid or high-temperature environment, so that not only can the transmission of wire harness signals be influenced, but also the wire harness can be burnt seriously, and safety accidents are caused. Therefore, protection of the automotive wiring harness is required.

At present, most of new energy automobile wire harnesses are protected by protective sleeves such as multi-corrugated-pipe holes, braided pipes and winding pipes, and the reliability of the automobile wire harnesses can be directly influenced by materials and structures of the protective sleeves. However, the existing new energy automobile wire harness protective sleeve is mostly made of nylon, polyester or nylon yarn, the flame retardance and the heat resistance of the new energy automobile wire harness protective sleeve are poor, the new energy automobile wire harness protective sleeve is easy to age and cannot be effectively waterproof, in addition, the new energy automobile wire harness protective sleeve is also required to be reinforced through metal accessories in the using process, the installation process is very complicated, and the application requirements in the automobile field cannot be met.

In order to solve the problem, chinese patent CN106410707A discloses an anti-collision high-power wire harness protection sleeve based on a sandwich structure and a manufacturing method thereof, wherein the wire harness protection sleeve comprises an outer-layer aramid fiber knitted net tube and an inner-layer glass fiber knitted pipe, in the preparation process, the outer surface of the glass fiber knitted pipe is coated with an organic silicon resin adhesive, then the organic silicon resin adhesive and the outer-layer aramid fiber knitted net tube are soaked together, and finally, a polyurethane solution and organic silicon resin are soaked together and cured to obtain a finished product. Therefore, in the wire harness protective sleeve, the outer aramid knitted net tube and the inner glass fiber knitted pipe are fixed together after being soaked in the polyurethane solution and the organic silicon resin together and then cured, the impact resistance of the wire harness protective sleeve is difficult to improve through the structural design of outer soft and inner hard, and the coating of the wire harness protective sleeve does not completely shield meshes of the knitted net, so that the wire harness protective sleeve also has a waterproof function.

In order to solve the above problems, people are always seeking an ideal technical solution.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a new energy automobile wire harness protective sleeve and a preparation method thereof.

In order to achieve the purpose, the invention adopts the technical scheme that:

A new energy automobile wire harness protective sleeve comprises a knitted net pipe and a coating coated on the knitted net pipe; the coating comprises the following raw materials in parts by mass: 45-52 parts of rubber resin, 25-42 parts of styrene-acrylic resin, 1-2 parts of anti-aging agent, 0.5-2 parts of antistatic agent, 3-9 parts of carbon chopped fiber, 2-6 parts of basalt chopped fiber, 1-3 parts of glass chopped fiber and 0.5-1 part of vulcanizing agent.

Based on the above, the rubber resin and the styrene-acrylic resin are both uncrosslinked resin prepolymers.

Based on the above, the rubber resin is ethylene propylene diene monomer rubber resin, isoprene rubber resin or nitrile rubber resin.

Based on the above, the vulcanizing agent is vinyl trimethoxy silane, or Fe (OH) ₃, triethanolamine, or ethylene thiourea, pentaerythritol tetraethenyl ester, or a combination of ethylene thiourea and benzimidazole derivatives.

Based on the above, the solid content of the styrene-acrylic resin is 38% to 43%, the styrene-acrylic resin is polymerized by styrene, acrylic acid, methyl methacrylate and a crosslinking monomer, wherein the crosslinking monomer is glycidyl methacrylate, N-N-butyl (iso) oxymethylacrylamide, acetoacetoxy ethyl methacrylate or glycidyl methacrylate.

Based on the above, the thickness of the protective sleeve is 2-4 mm; the length-diameter ratio of the carbon chopped fibers, the basalt chopped fibers and the glass chopped fibers is 2-13, and the length of the carbon chopped fibers, the basalt chopped fibers and the glass chopped fibers is smaller than the thickness of the protective sleeve.

Based on the above, the knitted mesh tube is made of aramid fiber and has a warp and weft density of (10-15) × (10-15), wherein the diameter of the aramid fiber is 5-8 μm.

Based on the above, the preparation method of the new energy automobile wire harness protection sleeve comprises the following steps:

Mixing the rubber resin, the styrene-acrylic resin and the vulcanizing agent at a low temperature, adding the anti-aging agent, the antistatic agent, the carbon chopped fibers, the basalt fiber chopped fibers and the glass chopped fibers, and granulating to obtain mixture particles; and putting the mixture particles and the knitted mesh pipe into a mold, injecting supercritical fluid for permeation and swelling to achieve diffusion balance, heating and releasing pressure to enable the mixture particles to be foamed and permeate and bond with the knitted mesh pipe, carrying out compression molding, cooling and taking out to obtain the new energy automobile wire harness protective sleeve.

Based on the above, the temperature of the low-temperature mixing is 50-60 ℃, the supercritical fluid foaming method adopts CO ₂ or N ₂ fluid, the temperature is 110-120 ℃, the pressure of the supercritical fluid is 3.5-15 MPa, the pressure release speed is 3-4 MPa/min, and the heating temperature in the die is 150-160 ℃.

Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress.

The new energy automobile wire harness protective sleeve provided by the invention adopts an integrated structure of a knitted net pipe and a coating, and has certain mechanical strength, certain tensile elasticity and good high-temperature resistance. Specifically, the knitted mesh pipe adopts aramid fibers, and carbon chopped fibers, basalt chopped fibers and glass chopped fibers in the coating are combined to effectively improve the mechanical strength and the high-temperature resistance of the protective sleeve; and the vulcanizing efficiency is improved while the vulcanizing temperature is reduced by adopting the composite vulcanizing agent. Further, in the preparation process, firstly, mixing is carried out at 50-60 ℃, materials are fully mixed, the rubber resin and the vulcanizing agent are subjected to low-temperature vulcanization reaction, and the styrene-acrylic resin is also partially crosslinked; and then the subsequent continuous reaction in the die finishes the crosslinking to improve the high temperature resistance, the water resistance and the mechanical property of the protective sleeve.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.