Flame-proof abrasion-resistant semi-fragrant polyamide composition

Abstract

The present invention discloses one kind of fire retardant antiwear semi-aromatic polyamide composition, which consists of semi-aromatic polyamide 40-55 wt%, polyamide 6 or polyamide 66 5-15 wt%, magnesium hydroxide 20-30 wt%, zinc borate 1-8 wt%, ultrahigh molecular weight polyethylene 5-15 wt%, unsaturated carboxylic acid or carboxylic anhydride grafted high density polyethylene 2-8 wt%, molybdenum disulfide 0.5-3 wt%, and coupling agent 0.2-0.5 wt%. The fire retardant antiwear semi-aromatic polyamide composition has high fire retarding property, high wear resistance, excellent high temperature rigidity and high size stability and low friction noise. It may be used in making various kinds of antiwear parts, such as lining, guide rail, piston ring, gear, slide block, etc.

Description

technical field [0001] The invention relates to a flame-retardant and wear-resistant semi-aromatic polyamide composition, in particular to a flame-retardant and wear-resistant semi-aromatic polyamide composition. Background technique [0002] Engineering plastics generally have the characteristics of excellent self-lubrication, wear resistance, low friction and special anti-occlusion properties, and can work normally even under poor lubrication conditions, so they are ideal wear-resistant materials. Polyamide has good structural regularity and strong crystallinity. Compared with other engineering plastics, it has better self-lubricating properties, less wear and friction factors, and is more suitable for wear-resistant materials. Semi-aromatic polyamides composed of terephthalic (iso)dicarboxylic acid units and alkylene diamine units with 6 to 12 carbon atoms, due to the introduction of aromatic rings in the main chain, the heat resistance and mechanical properties are impro...

AI Technical Summary

Problems solved by technology

However, the flame retardancy of the semi-aromatic polyamide alone is not enough, and the rigidity and dimensional stability are not high. In high-speed friction, the wear amount is high, and the friction factor is large. It is difficult to meet the long-term surface wear resistance and low friction under high load The use requirements of non-toxic self-lubricating engineering structural materials with frictional properties

[0003] In terms of flame retardant modification of semi-aromatic polyamides, the most general method is to add halogen or phosphorus flame retardants, but they have defects such as the generation of harmful gases, low decomposition temperature, and the decomposition temperature of inorganic metal hydroxides such as magnesium hydroxide Higher, high heat absorption, the activated magnesium oxide generated by decomposition adheres to the surface of combustibles to further prevent the progress of combustion, and can also absorb a large amount of harmful gases, smoke and incompletely burned melting gases produced by the combustion of polymers such as rubber and plastics. Residue, so that the combustion will be stopped quickly, no harmful substances will be produced during the whole flame retardant process, and it is very popular because of its filling effect. However, in the prior art, the filling amount of magnesium hydroxide is more than 40%. Effect