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Low-shrinkage nylon composite material

A nylon composite material, low shrinkage technology, applied in the field of nylon, can solve the problems of warping and deformation of injection molded products, expensive nylon, affecting product appearance and mechanical properties, etc., and achieve the effect of low shrinkage and reduced shrinkage rate

Inactive Publication Date: 2020-06-09
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nylon, also known as polyamide, is a good thermoplastic material; due to its good temperature resistance, toughness, stiffness and wear resistance, it is currently used more and more in automotive materials; but due to its amorphous Nylon in the state is relatively expensive, and currently more nylon is mainly semi-crystalline; due to the crystallization of this material, its injection molded parts often have a higher shrinkage; at the same time, in order to obtain better mechanical properties, it is often used. Glass fiber is used to reinforce nylon; however, due to the influence of nylon crystallization, the injection molded product will have warpage and deformation, which affects the appearance and mechanical properties of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A low-shrinkage nylon composite material is prepared by using the following raw materials: nylon, lithium chloride, thermoplastic polyurethane, and glass fiber, through a conventional method of melt blending and extrusion.

[0015] The specific composition of raw materials is: 100 parts by mass of nylon, 8 parts by mass of lithium chloride, 25 parts by mass of thermoplastic polyurethane, and 16 parts by mass of glass fiber.

[0016] Among them: nylon is medium-viscosity nylon 6; the flow rate of nylon 6 under a load of 2.16kg at a temperature of 230°C is 1.0-4.0g / 10min.

[0017] Lithium chloride is a Lewis acid, and its addition can produce a complex reaction with nylon, thereby destroying the hydrogen bond between nylon molecules, limiting the movement of nylon molecular chains, and hindering the crystallinity of nylon.

[0018] Thermoplastic polyurethane is a polyester type, and its addition can generate hydrogen bonds with nylon molecular chains during melt extrusion...

Embodiment 2

[0021] The difference with Example 1 is that the content of each component is different;

[0022] Specifically: 100 parts by mass of nylon, 2 parts by mass of lithium chloride, 30 parts by mass of thermoplastic polyurethane, and 20 parts by mass of glass fiber.

Embodiment 3

[0024] The difference with Example 1 is that the content of each component is different;

[0025] Specifically: 100 parts by mass of nylon, 6 parts by mass of lithium chloride, 20 parts by mass of thermoplastic polyurethane, and 8 parts by mass of glass fiber.

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PUM

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Abstract

The invention relates to a low-shrinkage nylon composite material. The low-shrinkage nylon composite material is prepared from nylon, metal chloride, thermoplastic polyurethane and glass fiber by using a melt extrusion method, wherein the addition amount of the metal chloride is not less than 2 wt% of the addition amount of the nylon, and the addition amount of the thermoplastic polyurethane is 20-30 wt% of the addition amount of the nylon. According to the invention, the lithium chloride and the thermoplastic polyurethane are introduced, and the movement of a nylon molecular chain is limitedby virtue of the effect of a reaction of the lithium chloride and the thermoplastic polyurethane with the nylon molecular chain, so the crystallinity of the nylon is hindered; and due to the reductionin the crystallinity of the nylon, the shrinkage rate of an injection molding product prepared from the composite material is reduced, and no buckling deformation phenomenon is generated.

Description

technical field [0001] The invention relates to the field of nylon, in particular to a low-shrinkage nylon composite material. Background technique [0002] Nylon, also known as polyamide, is a good thermoplastic material; due to its good temperature resistance, toughness, stiffness and wear resistance, it is currently used more and more in automotive materials; but due to its amorphous Nylon in the state is relatively expensive, and currently more nylon is mainly semi-crystalline; due to the crystallization of this material, its injection molded parts often have a higher shrinkage; at the same time, in order to obtain better mechanical properties, it is often used. Glass fiber is used to reinforce nylon; however, due to the influence of nylon crystallization, the injection molded product will have warpage and deformation, which affects the appearance and mechanical properties of the product. Contents of the invention [0003] The invention overcomes the disadvantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L75/06C08K7/14C08K9/02C08K3/16
CPCC08L77/02C08K2003/168C08K2003/162C08L75/06C08K7/14C08K9/02C08K3/16
Inventor 汪理文郑帅牛国增李庆贵翁永华
Owner SUZHOU RUNJIA ENGINEER PLASTIC