| abstract |
The invention relates to a composite high oxygen index flame-retardant polypropylene masterbatch and a preparation method thereof. The polypropylene masterbatch includes the following components in parts by weight: 60-75 parts of polypropylene PP, 15-20 parts of ammonium polyphosphate, 5 parts of pentaerythritol ~8 parts, 1~3 parts of aluminum hypophosphite, 0.3~0.7 parts of antioxidant, 0.3~1 part of lubricant and 0.1~0.3 parts of silane coupling agent; this application modifies ammonium polyphosphate and uses vinyl silicone oil Based on the combination of hydrogen-containing silicone oil cross-linking agent and platinum catalyst, ammonium polyphosphate dispersion and nano-alumina powder are added to prepare ammonium polyphosphate grafted with liquid silica gel, which has excellent hydrophobicity; liquid silica gel is Non-polar molecule, there is a non-polar segment in the modified molecule, which improves the compatibility with polypropylene; and, the ammonium polyphosphate molecular chain is grafted with nano-alumina, and the nano-alumina and liquid silica gel form a synergistic It can significantly increase the decomposition temperature of ammonium polyphosphate, effectively prevent the masterbatch from producing a large amount of white smoke during combustion, and has excellent smoke suppression properties. |