Basic knowledge of fire retardant polypropylene

Basic knowledge of fire retardant polypropylene

(1) halide - antimony system, namely the gas phase mechanism of flame retardant. Common phosphorus-containing flame retardants is ten pbdes, hexabromocyclododecane, eight bromine ether, tetrabromobisphenol A, etc., coupled with flame retardant agent antimony trioxide, association with adding quantity is little, flame retardant effect good characteristic. But halogen flame retardants have been green groups of reproach, and constrained in some countries, be banned to use. But still allow the use of the United States, Japan and other countries, so China as a developing country, the service life of phosphorus-containing flame retardants at least 10 years.

(2) using bromine and alkyl phosphate ester to deal with PP. This kind of flame retardant both P Br synergistic effect, make the flame retardant effect significantly, but also can improve the rheological properties and processing properties of PP, has little effect on physical and mechanical properties of the PP.

(3) in the past decade, in PP flame retardant technology in Turin, Italy, a professor at the university of Camino pioneering expansion type flame retardant has played a huge role, this kind of P N series flame retardant with high efficiency, high thermal and light stability, low toxicity, low smoke, low corrosion, small effects on processing and mechanical performance, can not cause environment pollution. Just add 2530 in PP can reach UL94V level 0. Domestic production of the just have expansion type flame retardant products.

(4) five benzyl bromide acrylate with epdm graft copolymer of flame retardant polypropylene. This kind of flame retardant treatment of PP with high impact strength, in some cases can be used as engineering plastics.

(5) inorganic filler flame retardant polypropylene so-called inorganic filling material namely aluminium hydroxide and magnesium hydroxide, they have the function of the flame retardant and smoke suppression. But to achieve the desired effect, particulates and surface treatment is the key technology, applied to different plastic. Carefully choose the matching surface active agent, make it has good compatibility with plastic, and evenly dispersed in plastic, and not too the influence on the mechanical properties of the plastic. Because of ATH and magnesium hydroxide can in different temperature range flame retardant smoke suppression effect, so the distribution of both use can make the plastic in relatively wide temperature range for flame retardant effect. Here is to emphasize that when deal with PP with magnesium hydroxide, to achieve a better flame retarding effect and suitable mechanical properties, adding magnesium hydroxide in the mixing process, appropriate USES two-step feeding way, it will get better results than a charging.