Special halogen-free flame retardant reinforced PA (polyamide) 56 composite material for casing of low-voltage circuit breaker

Abstract

The invention discloses a special halogen-free flame retardant reinforced PA (polyamide) 56 composite material for a casing of a low-voltage circuit breaker. The composite material comprises components in parts by mass as follows: 35-70 parts of PA 56, 20-40 parts of alkali-free glass fiber, 0.1-1.2 parts of a glass fiber dispersing agent, 6-20 parts of halogen-free flame retardant, 12-30 parts of modified filler, 0.3-0.9 parts of an antioxidant, 0.2-0.6 parts of a lubricant and 0.5-1.2 parts of a coupling agent. The composite material can have excellent flame retardance and burning resistance, and can meet the low-voltage circuit breaker industry requirement that the material is contacted with a glow wire for 30 s at the temperature of 960 DEG C and a flame is extinguished within 10 s after the material is separated.

Description

technical field [0001] The invention relates to a nylon material, in particular to a polypentamethylene adipamide composite material specially used for halogen-free flame-retardant reinforced low-voltage circuit breaker shells. Background technique [0002] Nylon fiber is one of the first synthetic fibers put into industrial production in the world, and its output ranks second among synthetic fibers. Nylon low-denier yarn (200 ~ 700dtex) has the characteristics of high breaking strength, wear resistance, fatigue resistance, impact resistance, and good dimensional stability. It is widely used in military products, rubber skeleton materials, airbag wires and ropes, nets, cables fabrics, tarpaulins, industrial filter cloths and other fields; at the same time, because of its soft hand feeling, light texture, good drapability, breathable moisture absorption, good elasticity, easy processing and other good wearability, it is used in high-grade sewing thread silk, T-shirt silk, Um...

AI Technical Summary

Problems solved by technology

However, both have their own shortcomings in the polymerization and spinning process, resulting in a decline in economic benefits.

For PA6, since there are many unreacted monomers in the polymerized melt, direct spinning after polymerization cannot be achieved. The polymerized melt must be cooled, pelletized and washed with water to remove unreacted monomers. , and then dry and melt to spin, which causes a lot of waste of energy and pollution to the environment

For PA66, due to its fast crystallization speed, the spinnability is poor, especially when spinning fine denier yarn, its dyeing uniformity is more difficult to control, and at the same time, the high melting point and structure of PA66 lead to poor spinning performance. Cross-linking is prone to occur during the process, and the existence of the above problems makes the spinning cost of PA66 more than 10,000 yuan / ton higher than that of PA6.

[0004] In addition, the current nylon is basically made of petroleum derivatives as raw materials, such as nylon 6 and nylon 66 with the largest market share, and their raw materials caprolactam and adipic acid are hydrogenated and reoxidized by benzene homologues, etc. Hexamethylenediamine is prepared by a series of reactions. Hexamethylene diamine is first synthesized from butadiene or acrylonitrile and then prepared by catalytic hydrogenation. The whole synthesis process is complicated and has certain pollution