A kind of surface high hardness wear-resistant nylon and its preparation method

Abstract

The invention discloses nylon with a highly hard and abrasion resistant surface and a preparation method thereof. The nylon with the highly hard and abrasion resistant surface adopts the technical scheme as follows: a gradient hardening abrasion-resistant layer is arranged on the nylon surface; the gradient hardening abrasion-resistant layer comprises Si-C reticular cross-linking layer and an inorganic carbonized layer from outside to inside; the depth of the gradient hardening abrasion-resistant layer is 1-6 microns; the percentage content of the carbon atoms in the inorganic carbonized layer is not lower than 95%; the depth of the inorganic carbonized layer is 0.5-5 microns. According to the preparation method, nylon is fixed on the target table of an ion implanter, firstly argon plasma is adopted to activate the material surface in a vacuum condition to form the inorganic carbonized layer, and silicon plasma or silicon / nitrogen plasma is injected to form an inorganic compound hardening abrasion-resistant layer; the method is easy to operate, and has no effect on the physical-chemical structure of the nylon body; the obtained nylon after treatment is stable in surface structure, high in surface rigidity and good in abrasion resistance, and can be widely used in structural load-bearing components.

Description

technical field [0001] The invention relates to the technical field of modification of engineering plastics. More specifically, it relates to a preparation method of nylon with high surface hardness and wear resistance. Background technique [0002] Nylon (Nylon), also known as polyamide, was developed by DuPont Company Carothers and its research and development team in the 1930s. It originally referred to polyamide 66 fiber, which is the world's first synthetic fiber. fiber. Subsequently, with the continuous improvement of the nylon synthesis process, the commercialization of nylon expanded from the initial nylon 66 to nylon 6, nylon 11, nylon 12 and other grades, and the application field also expanded from the initial textile fiber to structural engineering plastics It has become one of the most widely used engineering plastics. However, due to the strong polar amide bond in the nylon molecular chain, the water absorption is strong, the dimensional stability of the fin...

AI Technical Summary

Problems solved by technology

Adding reinforcing fibers such as glass fiber, carbon fiber, and aramid fiber to nylon can significantly increase the rigidity of the nylon composite material and improve the surface hardness of the material, but the improvement of the wear resistance of the composite material is limited; and the addition of wear-resistant fillers such as Molybdenum disulfide, carbon black, polytetrafluoroethylene powder, silicone powder, etc. can better improve the wear resistance of nylon composite materials, but the addition of wear-resistant fillers is relatively large

Whether it is reinforcing fiber or wear-resistant filler, the melt fluidity of the composite material will be reduced, and the machinability of the material will be reduced, which is not conducive to the preparation of parts with complex structures.

In addition, for direct modification of the surface of nylon parts, chemical vapor deposition or magnetron sputtering diamond-like coating (DLC) or other wear-resistant coatings are generally used to achieve, because diamond-like coatings (DLC) or other wear-resistant coatings The rigidity of the layer is strong, while the rigidity of the nylon base material is weak, resulting in a large internal stress in the interface bonding layer, and poor bonding between the coating and the nylon base. Long-term use of the coating is easy to peel off from the base, resulting in material failure