A kind of ultra-high fluidity halogen-free flame-retardant polypropylene composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant polypropylene composite material with ultra-high fluidity and a preparation method thereof. The halogen-free flame-retardant polypropylene composite material consists of polypropylene, P-N intumescent flame retardant, a compatibilizer, It is composed of hyperdispersant, filler with high aspect ratio, nanometer filler, lubricant and antioxidant. Its preparation method is very simple. Put each component into a twin-screw extruder for extrusion and granulation. The halogen-free flame-retardant polypropylene composite material of the invention has ultra-high fluidity, excellent flame-retardant performance, simple preparation process, low cost, halogen-free and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of polypropylene composite materials, and in particular relates to an ultra-high fluidity halogen-free flame-retardant polypropylene composite material and a preparation method thereof. Background technique [0002] Flame retardants commonly used in flame-retardant polypropylene materials are brominated flame retardants and halogen-free intumescent flame retardants. Brominated flame retardants include decabromodiphenylethane, octabromoether, etc. The brominated flame retardant system can achieve dripping non-combustible cotton as long as the amount of flame retardant is increased. Since dripping will take away part of the heat, the easier it is to drip, the easier the flame retardant level will reach UL94-V0 level. Therefore, as long as high-fluidity polypropylene is selected and a large amount of brominated flame retardant is added, it is easy to obtain a polypropylene material with high fluidity and high f...

AI Technical Summary

Problems solved by technology

However, increasing the addition of flame retardants and anti-dripping agents will lead to a sharp decline in the fluidity of polypropylene materials, especially anti-dripping agents (adding 0.3wt% can reduce the melt index of polypropylene from 100g / 10min to 40g / min)

At present, the melt index of halogen-free intumescent polypropylene materials with flame retardancy reaching 0.75mm spline UL94-V0 level is basically less than 20g / 10min. Moreover, if polypropylene with higher fluidity (melt index ≥ 200g / 10min), which means adding more anti-dripping agent (adding more than 0.4wt%) to ensure that the 0.75mm sample does not drip when burning, and the polypropylene material thus prepared tends to swell when pumping pellets , cannot be pulled smoothly, and the material is very brittle (the higher the melt index of the PP substrate, the more brittle the prepared material), there is no use value at all

[0004] For starter shells, capacitor shells, plug inner frames and other products, in order to improve production efficiency and reduce production costs, the thickness of the shell is usually controlled at about 0.75mm, and the mold design is usually more than 80 in one mold. At the same time, the parts have A certain depth, for this type of parts, usually the higher the melt index, the easier the product will be demolded, otherwise it is necessary to increase the injection temperature, injection pressure and injection speed, which will cause the flame retardant to partially decompose, and the production cost Increase

[0005] CN 102702612A discloses a high-flowability halogen-free flame-retardant polypropylene material. Although its melt index exceeds 50g / 10min, its flame-retardant performance can only reach the 1.5mm spline UL94-V0 level, so it is not suitable for Qihui Thin-walled products such as device shells, capacitor shells, and plug inner frames

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