A kind of low mold scale halogen-free flame retardant reinforced high temperature nylon material and preparation method thereof

Abstract

The invention discloses a low-scale, halogen-free flame-retardant reinforced high-temperature nylon material and a preparation method thereof. The raw materials of the high-temperature nylon material include high-temperature nylon raw materials, reinforcing fiber, halogen-free flame retardant, hydrotalcite, acid absorbing agent sodium polyacrylate, antioxidant and lubricant. The high-temperature nylon material can be formed by a twin-screw extruder. The invention uses hydrotalcite and polymer acid absorbing agent sodium polyacrylate to synergistically absorb the free acid produced by the decomposition of the flame retardant, and absorbs and partially decomposes the small molecule volatiles produced by the hydrotalcite, thereby greatly reducing the release of organic gas and reducing mold scale It is especially suitable for high-speed thin-wall molding with high injection speed and high exhaust requirements.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to high-temperature nylon materials. Background technique [0002] The long-term use temperature of high-temperature nylon is greater than 150°C, the instantaneous high temperature resistance is greater than 260°C, and the melting point is 290-320°C. It is suitable for SMT technology in the electrical and electronic industry, and the UL94 V-0 level is the basic requirement for plastic materials in the electrical and electronic field. Traditional flame-retardant high-temperature nylon is flame-retardant with brominated flame retardants, but with the release of the European Union's Rohs directive on restricting and prohibiting the use of toxic substances and the WEEE directive on the disposal of waste electronic equipment, the electrical and electronic industry, especially the connector industry, basically adopts Halogenation-free solution. At present, halogen-free flame-re...

AI Technical Summary

Problems solved by technology

At present, halogen-free flame-retardant reinforced high-temperature nylon materials are generally flame-retardant by adding phosphorus-based flame retardants such as phosphinate and red phosphorus, but the acidic substances decomposed during the processing of flame retardants can easily cause degradation of high-temperature nylon, and a large number of small organic molecules are deposited. Causes mold deposits on the mold surface

Mold fouling is easy to block the vent hole, especially for high-speed thin-wall molding, high injection speed, high exhaust requirements, and blockage of the vent hole will easily cause the end of the plastic part to burn

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