Preparation method of a high wear-resistant reversible dynamic cross-linked polyamide material

Abstract

The invention discloses a method for preparing a highly wear-resistant reversible dynamic cross-linked polyamide material, which comprises the following steps: mixing a dynamic cross-linking agent, a wear-resistant auxiliary agent, an antioxidant and a polyamide material for melt blending, wherein The wear-resistant additive is prepared by compounding functional fillers and organic molybdenum additives. The obtained reversible dynamic cross-linked polyamide masterbatch is mixed with polyamide materials for melt blending and drying to obtain high wear-resistant reversible dynamic cross-linked polyamide Material. In the preparation method of the present invention, the dynamic cross-linking process of the dynamic cross-linking agent and polyamide is realized in the melting process, thereby being able to overcome the disadvantages of cumbersome preparation process in the prior art and reduce the preparation of reversible dynamic cross-linking polymer materials. cost, and the prepared material has good wear resistance, good strength and toughness, excellent self-healing performance and recycling performance, good heat resistance and thermal stability, and longer service life, showing high The use value and good application prospects.

Description

technical field [0001] The invention belongs to the field of polymer material modification, and relates to a preparation method of a high wear-resistant reversible dynamic cross-linked polyamide material. Background technique [0002] Polymers and their composite materials have excellent characteristics such as low density, high specific strength and specific modulus, and good toughness, and are widely used in various fields of the national economy. With the development of social economy, higher performance requirements are raised for polymers and their composite materials. Therefore, effectively and fully improving the properties of materials has become a key issue in the research of polymer materials. [0003] At present, dynamic bonds are introduced into the polymer cross-linked network to form reversible cross-linked polymers. During the use of such materials, dynamic bonds exist stably, thereby providing materials with good mechanical properties, heat resistance, solve...

AI Technical Summary

Problems solved by technology

However, in previous reports, reversible dynamic cross-linked polymer materials have disadvantages such as cumbersome preparation process of dynamic small molecules, expensive raw materials, and low mechanical properties of materials, which make the practical application of materials difficult, and are mainly concentrated in hydrogel systems. , less used in the field of polymer resin

In addition, the existing dynamic crosslinking process is often completed by solution system, which poses a great challenge to the operation process and processing cost

[0004] Although the friction coefficient of polyamide material itself is not high, its friction and wear performance will have a great impact on the life of its workpiece during long-term use, especially under many heavy loads.

For this reason, there are many improvement schemes for the friction and wear properties of polyamide materials. Among them, the more extensive methods mainly focus on the uniform compounding of functional fillers with polyamide materials through melt blending, thereby improving their friction and wear properties. The more common functional fillers that reduce the coefficient of friction mainly include: molybdenum disulfide, graphite, silicone resin, etc., but whether these functional fillers can be effectively dispersed in the polyamide matrix has always been an important factor that plagues the performance improvement of polyamide materials.

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