Halogen-free flame-retardant polypropylene composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant polypropylene composite material and a preparation method thereof. The material comprises polypropylene and particularly consists of polyphosphate, polyhexamethylene guanidine salt and polypropylene according to the weight ratio of (1-2.5): (1-2.5): 20, wherein the polyphosphate is one of or a mixture of sodium polyphosphate and ammonium polyphosphate; the polyhexamethylene guanidine salt is one of or a mixture of more than two of polyhexamethylene guanidine phosphate, polyhexamethylene biguanidine hydrochloride and polyhexamethylene biguanide phosphate. The method adopts a melt-blending method and comprises the following steps: putting the polyphosphate, the polyhexamethylene guanidine salt and the polypropylene into a torque rheometer and mixing for 5-30 minutes at a temperature of 140-200 DEG C to prepare the halogen-free flame-retardant polypropylene composite material. The halogen-free flame-retardant polypropylene composite material is better in flame-retardant property, less in raw material required, simple and convenient to manufacture and low in cost and can be easily and widely applied to the fields of mechanical parts, corrosion-resistant parts, insulating parts, food utensils and the like.

Description

technical field [0001] The invention relates to a polypropylene composite material and a preparation method thereof, in particular to a halogen-free flame-retardant polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene (PP) with high transparency, easy processing, non-toxicity, good electrical properties, mechanical properties, and chemical stability has been widely used in mechanical parts, corrosion-resistant parts, insulating parts and tableware, among the five general-purpose plastics Among them, its consumption is second only to polyethylene. However, because polypropylene itself is extremely flammable, its oxygen index is only 17-18%, it has a large calorific value, a fast burning speed, and it is accompanied by dripping when burning, which limits its application in industries that require high levels of flame retardancy. . Therefore, the research and development of PP with flame-retardant properties has attrac...

AI Technical Summary

Problems solved by technology

Although this kind of composite material has a good flame retardant effect, it also has shortcomings. First of all, although ammonium polyphosphate and magnesium hydroxide, which play the main flame retardant role in the product, can both be flame retardant, they do their own thing. , failed to cooperate with each other and act together, so that the product could not obtain the maximum flame retardant performance

The reason is that, as a kind of halogen-free flame retardant material commonly used at present - polyphosphate, when it is used alone as a flame retardant, its flame retardant efficiency is low, and it needs to be used in conjunction with other flame retardant materials, while magnesium hydroxide It mainly achieves the purpose of flame retardancy by absorbing heat and releasing water vapor to dilute oxygen. It is extremely difficult to cooperate well with polyphosphate with a solid phase flame retardancy mechanism to achieve the maximum flame retardancy effect; secondly, the preparation method cannot Products with better flame retardant effect