High-strength and wear-resistant polyamide composite material and preparing method thereof

Abstract

The invention discloses a high-strength and wear-resistant polyamide composite material and a preparing method thereof. The composite material comprises, by weight, 30-70 parts of polyamide66, 3-10 parts of grafting-type toughening agent, 3-10 parts of copolymerization-type toughening agent, 10-50 parts of wear-resistant master batches, 20-40 parts of wear-resistant reinforcing filler, 0.1-3 parts of heat stabilizer, 0.1-3 parts of nucleating agent, 0.1-3 parts of lubricating agent and 0.1-1 part of silane coupling agent. The preparing method includes the steps that the polyamide66, the grafting-type toughening agent, the copolymerization-type toughening agent, the wear-resistant master batches and the wear-resistant reinforcing filler are weighed according to the weight, added into a mixing machine and mixed to be even; the heat stabilizer, the nucleating agent, the lubricating agent and the silane coupling agent are weighed according to the weight, poured into the mixing machine and mixed with the mixture to be even; the final even mixing liquid is put into a double-screw extruder and extruded to be subjected to injection molding through an injection molding machine, and the composite material is obtained. The high-strength and wear-resistant polyamide composite material and the preparing method thereof have the advantages of being high in rigidity, toughness, heat resistance, wear resistance, processing accuracy and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyamide composite material with high rigidity, high toughness, high heat resistance, high wear resistance and high dimensional stability and a preparation method thereof. Background technique [0002] With the rapid development of modern material science, more and more metal materials are replaced by engineering plastics; engineering plastics are often used to make structural functional parts such as gears, bearings, and bushings. Factors such as temperature, humidity, and rotational speed will affect the material. Therefore, wear-resistant engineering plastics are required to have a low friction coefficient and friction loss, and they should also have high rigidity, high toughness, and high heat resistance; at present, general wear-resistant engineering plastics have the following properties: Disadvantages: 1. The amount of wear-resistant filler added is large, resulting in ...

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Problems solved by technology

[0002] With the rapid development of modern material science, more and more metal materials are replaced by engineering plastics; engineering plastics are often used to make structural functional parts such as gears, bearings, and bushings. Factors such as temperature, humidity, and rotational speed will affect the material. Therefore, wear-resistant engineering plastics are required to have a low friction coefficient and friction loss, and they should also have high rigidity, high toughness, and high heat resistance; at present, general wear-resistant engineering plastics have the following properties: Disadvantages: 1. The amount of wear-resistant filler added is large, resulting in insufficient rigidity or toughness of the material, and it cannot be taken into account at the same time. 2. The temperature resistance of the material is not enough. Under continuous high temperature work, the workpiece is easy to deform. 3. The heat of the material Poor stability, after working for a long time, the mechanical properties will drop significantly , which is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain; polyamides have good comprehensive properties, including mechanical properties, heat resistance, wear resistance and chemical resistance, and self-lubricating properties , low coefficient of friction, and has certain flame retardant properties; polyamide 66, as an important species in the polyamide family, has many advantages, but as some special wear-resistant structural functional parts, the rigidity of the material needs to be further improved. Toughness, heat resistance, wear resistance, reduce water absorption and improve dimensional stability

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