Weather-resistant flame-retardant polypropylene composite material and preparation method thereof

Abstract

The invention discloses a weather-resistant flame-retardant polypropylene composite material which is characterized by comprising 93-97wt% of polypropylene, 1-2wt% of main flame retardant, 0.2-0.5wt% of synergistic flame retardant, 0.1-0.5wt% of chain-cutting agent, 0.1-0.5wt% of foaming agent and 1.5-2wt% of carbon black, and further comprising 0.1-1wt% of other assistants, wherein the other assistants include one or more of antioxidant, dispersant and lubricant; and the carbon black is channel carbon black, and the particle size is 15-25nm. The invention also discloses a preparation method of the weather-resistant flame-retardant polypropylene composite material. According to the invention, the carbon black is selected as weather resistance modifier; the bromine-containing flame retardant, the synergistic flame retardant, the high-temperature chain-cutting agent and the high-temperature foaming agent are combined; the weather-resistant flame-retardant polypropylene composite material is prepared through melt blending; the weather resistance is excellent; the flame retardance is up to UL94V-0 level; the mechanical performance of the material changes little before and after modification; and the weather-resistant flame-retardant polypropylene composite material is low in raw materials and simple and easy to process.

Description

technical field [0001] The invention relates to a flame-retardant composite material and a preparation method thereof, in particular to a weather-resistant flame-retardant polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene has excellent mechanical properties, good heat resistance, high chemical stability, excellent electrical insulation, and good processability. It is a general-purpose plastic with excellent comprehensive properties. However, due to its saturated hydrocarbon structure and the existence of tertiary carbon atoms, polypropylene is extremely flammable and has poor weather resistance. [0003] Halogenated flame retardants are the most effective flame retardant additives for polyolefin materials with less addition, high flame retardant efficiency, and minimal impact on polymer properties. The commonly used varieties mainly include decabromodiphenylethane, hexabromocyclic Dodecane, octabromoether, octabro...

AI Technical Summary

Problems solved by technology

[0010] The halogen-based flame-retardant and weather-resistant technologies disclosed in the above-mentioned patents all use ultraviolet absorbers and / or hindered amine light stabilizers, and have not yet solved the problem of high carbon black content (>1wt) when only carbon black is used as a weather-resistant modifier. %), how to prepare flame-retardant and weather-resistant polypropylene; and there are the following common deficiencies, which affect its use in various fields:

[0011] ① Ultraviolet absorbers and hindered amine light stabilizers are organic polar small molecules, which have problems of saturation and volatilization with non-polar polypropylene resins, and under long-term ultraviolet rays, there are side reactions such as degradation and even failure problems.

[0012] ② Commonly used hindered amine light stabilizers will react with brominated flame retardants due to their high alkalinity, and there is a problem of confrontation between weathering agents and flame retardants

[0013] ③ Compared with carbon black, UV absorbers and hindered amine light stabilizers are much more expensive

[0014] In addition, some of the above patented technologies, such as patents ZL 201010022551.X, ZL 200510059438.8, ZL 200480002250.3 and patent CN 102964673 A, also have a large amount of flame retardants, which have a significant impact on the mechanical properties of the material, thus limiting the application of flame-retardant and weather-resistant polypropylene scope

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