Reinforced and toughened ultra-low temperature resistant nylon composite material and preparation method and application thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly discloses a reinforced and toughened ultra-low temperature resistant nylon composite material. The reinforced and toughened ultra-low temperature resistant nylon composite material is prepared from the components: 55-75 parts of nylon resin, 15-30 parts of glass fiber, 5-12 parts of a toughening agent and 0.5-2 parts of a lubricating agent, the toughening agent is a mixture of amino-terminated polydimethylsiloxane, epoxy-terminated polydimethylsiloxane and an organosilicone elastomer toughening agent; andthe glass fiber is the glass fiber modified by a silane coupling agent containing an amino group or an epoxy group. The invention further discloses a preparation method of the reinforced and toughenedultra-low temperature resistant nylon composite material, and application to preparation of high-speed rail fittings in areas with extremely-cold climate and the fields of electronic engineering, communication and aerospace in the ultra-low temperature environments, the reinforced and toughened ultra-low temperature resistant nylon composite material is high in strength and good in toughness, theultra-low temperature resistant performance is especially excellent, the preparation method is simple, the production efficiency is high, and the reinforced and toughened ultra-low temperature resistant nylon composite material has the universality, and is suitable for large-scale production application.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a reinforced and toughened ultra-low temperature-resistant nylon composite material and a preparation method and application thereof. Background technique [0002] Nylon material, as the earliest developed and most widely used engineering plastic, not only has the advantages of high mechanical strength, good heat resistance, excellent wear resistance, etc., but also has excellent processing flow properties. After strengthening and toughening modification, It has a wide range of applications in the fields of automobiles, electrical appliances, and railway equipment. [0003] In recent years, my country's high-speed railway has developed rapidly, which provides a new opportunity for the application of nylon composite materials. In high-speed railways, nylon composite materials are used to prepare baffle seats, rail insulating gauge blocks and plastic sleeves ...

AI Technical Summary

Problems solved by technology

[0006] From the analysis of the existing toughening system, it can be found that the main reasons for the poor ultra-low temperature resistance of the current toughening system are: 1) the glass transition temperature of the olefin elastomer toughening agent itself is high, and the ultra-low temperature resistance is poor; 2) the toughening agent The interface with the matrix resin is poorly bonded. Although the elastomer has been grafted with maleic anhydride to improve the compatibility with nylon, the combination of the two is still only physically compatible, and the ultra-low temperature environment will reduce the compatibility, resulting in toughening properties. decline

[0007] According to the requirements of nylon composite materials to maintain good toughness at ultra-low temperatures, and the problem that the current toughening system cannot achieve ultra-low temperature resistance, the present invention provides a reinforced toughened ultra-low temperature resistant nylon composite material, which not only has high strength, but also has good Low-temperature toughness, especially at ultra-low temperatures (below minus 40°C), it can still maintain high toughness, thus realizing the application of nylon composite materials in high-speed railways in extremely cold regions

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