Reinforced polyamide composite material with high flowability and good surface and preparation method thereof

Abstract

The invention relates to a reinforced polyamide composite material with high flowability and a good surface. The reinforced polyamide composite material is prepared from the following raw materials by weight percent: 20% to 70% of nylon, 5% to 20% of PA6 (Polyamide 6), 25% to 60% of reinforced fibers, 0.5% to 1% of chain reducing agent, 0.2% to 0.6% of nucleating agent, 0.2% to 0.4% of antioxidant and 0.2% to 1% of lubricant. The invention further provides a preparation method of the polyamide composite material. The method has the technical characteristics that the PA6 with high flowability, the chain reducing agent, the nucleating agent and other aiding agents are added, so that the molecular weight distribution and the crystallization performance of nylon are improved, and the flowability of the polyamide composite material is improved. The polyamide composite material prepared by the method is excellent in mechanical strength, very good in flowability and apparent quality and high in welding mark strength, thereby being especially suitable for large-sized functional components with complicated appearance requirements.

Description

technical field [0001] The invention relates to the technical field of polyamide composite materials, in particular to a reinforced polyamide composite material with high fluidity and good surface and a preparation method thereof. Background technique [0002] Polyamide has good mechanical strength and rigidity, good wear resistance and other advantages, and is widely used in automotive parts, mechanical parts, electrical and electronic fields, etc. It is the first of the five major engineering plastics, replacing traditional metal materials in many applications . Nylon composite materials obtained through fiber mineral reinforcement and modification have excellent properties such as high strength, high heat resistance, and low shrinkage. As engineering plastic materials, they are widely used in traditional fields. With higher requirements, the material not only needs good mechanical properties, but also the appearance quality is very important. With the addition of reinfo...

AI Technical Summary

Problems solved by technology

With the addition of reinforcing materials such as glass fiber and minerals, as their content increases, the molded fluidity of the reinforced nylon composite material becomes poor, and the compatibility of fibers and resins deteriorates, resulting in difficulty in forming the material and the strength of the weld line. A series of problems such as reduction and poor appearance quality affect the final use of the product

[0003] U.S. Patent 6191207 solves this problem by controlling the use of glass fiber materials. It requires the fineness of the glass fiber body to be 15-30 μm and the length-to-diameter ratio to be in the range of 10-20. The composite material thus prepared has good apparent quality, but the fluidity is not improved. Large and glass fiber usage is limited

[0004] Domestic Patent Application Publication No. 102888099A "Fiberless Glass Fiber Organic Reinforced Nylon 66 and Its Manufacturing Process" uses an organic glass fiber modifier to improve the surface finish and fluidity of the material, but the additive belongs to organic aniline compounds. Low melting point, volatile during processing, strong odor, harmful to human health

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