Halogen-free expansion fire retardant for polypropylene

Abstract

A halogen-free intumescent flame retardant for polypropylene relates to a flame retardant for polyolefine, which is formulated by melamine salt, ammonium polyphosphate, lubricant, coupling agent and char-forming accelerator, wherein the percentage of each component in the total weight of the flame retardant is: 14 percent-90 percent of melamine salt, 9 percent-85 percent of ammonium polyphosphate,0.1 percent-2 percent of lubricant, 0.1 percent-2 percent of coupling agent, and 0.1 percent-5 percent of char-forming accelerator; when the flame retardant of the invention is used for the flame-proof of polyethylene powder or granular materials, and the lowest addition is 21 percent(wt), the flame-proof grade reaches the V-0 grade according to US UL94 test, so compared with the prior art, the addition of the flame retardant of the invention is greatly decreased, the cost is reduced and the processing property of the polypropylene is not affected. Compared with brominated, the halogen-free flame retardant of the invention is environment-friendly with low smoke density, small smoke mass, lower mass loss rate and big residual mass when used for the flame-proof performance of polypropylene.

Description

technical field [0001] The invention relates to a flame retardant for polyolefin, in particular to a halogen-free intumescent flame retardant for polypropylene. Background technique [0002] Flame retardant materials, especially environmentally friendly halogen-free flame-retardant polymer materials and flame-retardant technology are becoming a hot topic in research all over the world. The voice of halogen-free flame-retardant is increasing day by day. The European Union and other countries have successively issued laws and regulations to limit agent use. In order to make polymer materials flame retardant and not produce toxic smoke when burned, non-polluting flame-retardant elements must be introduced into the polymer. The most practical and effective way to introduce non-polluting flame-retardant elements into materials is to add environmentally friendly type flame retardant. [0003] At present, the flame retardant means for polymers is mainly based on adding halogen fl...

AI Technical Summary

Problems solved by technology

[0006] The biggest disadvantages of the above-mentioned mixed intumescent flame retardants are difficult processing, moisture absorption, large dosage, affecting the mechanical properties of materials and high prices, which limit the application

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