What kind of flame retardant use for polypropylene

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• Release date：2018-11-19
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Flame retardant polypropylene

1. Halogen-ruthenium system, ie gas phase flame retardant mechanism. The commonly used halogenated flame retardants are decabromodiphenyl ether, hexabromocyclododecane, octabromoether, tetrabromobisphenol A, etc., together with the flame retardant synergist antimony trioxide, which has a small amount of addition and resistance. Good burning effect. However, halogen-based flame retardants have been blamed by green environmental organizations, and even in some countries, they are banned. However, the United States, Japan and other countries still allow the use, then as a developing country in China, halogenated flame retardants have a life expectancy of at least 10 years.

2 Treat the PP with a bromoalkyl phosphate. This kind of flame retardant has the synergistic effect of PBr, which makes the flame retardant effect remarkable, and also improves the rheology and processing property of PP, and has little influence on the physical and mechanical properties of PP.

3 In the past ten years, in the PP flame retardant technology, the intumescent flame retardant pioneered by Camino, a professor at the University of Turin, Italy, has played a huge role. This type of PN flame retardant has high efficiency, high heat and light stability, and low toxicity. Low smoke, low corrosion, little impact on processing and mechanical properties, will not cause environmental pollution. UL94V0 can be achieved by adding 25-30 parts to PP. There have been reports on the production of intumescent flame retardant products in China.

 4 Graft copolymer of pentabromobenzyl acrylate and ethylene propylene diene rubber flame retardant polypropylene. This type of flame retardant PP has high impact strength and can be used as an engineering plastic in some applications.

5. Inorganic Filler Flame Retardant Polypropylene The so-called inorganic filler refers to aluminum hydroxide and magnesium hydroxide, which have the functions of flame retardant and smoke suppression. But to achieve the desired results, micronization and surface treatment are key technologies that are applied to different plastics. The matching surfactant should be carefully selected to make it compatible with plastics and evenly dispersed in the plastic without affecting the mechanical properties of the plastic too much. Since ATH and magnesium hydroxide can be used for flame retardant and smoke suppression in different temperature ranges, the combination of the two can make the plastic continue to flame retardant over a wide temperature range. It should be emphasized here that in the treatment of PP with magnesium hydroxide, in order to achieve better flame retardant effect and suitable mechanical properties, in the process of adding magnesium hydroxide mixing, it is preferable to adopt a two-step feeding method, which will result in a ratio Better results in one feed.