Sulfonated polystyrene flame retardant and low-halogen flame-retardant polypropylene material

Abstract

The invention discloses a sulfonated polystyrene flame retardant and a low-halogen flame-retardant polypropylene material. A preparation method of the sulfonated polystyrene flame retardant comprises the following steps: adding a styrene resin and a sulfonating agent to a nitrogen protection container according to a molar ratio of the styrene resin to the sulfonating agent of 1:1-1:1.1, carrying out an aromatic electrophilic substitution reaction, adding a halogenated salt to the container after ending the aromatic electrophilic substitution reaction to salt out resulting sulfonated products, neutralizing the PH value of reactants in the container to 7-8, and extract-purifying by toluene to obtain the sulfonated polystyrene flame retardant. The low-halogen flame-retardant polypropylene material comprises, by weight, 94-98% of polypropylene, 1-4% of a complex formulation flame retardant, 0.5-1% of a lubricant, 0.2-0.6% of an oxidant and 0.2-0.5% of other assistants. According to the invention, different flame retardation grades of the polypropylene material can be reached by adjusting the application amount of the flame retardant, so a good flame retardation effect can be reached by using a small amount of the flame retardant, and simultaneously the clarity of the polypropylene material is basically not affected.

Description

[technical field] [0001] The invention relates to the field of polymer materials, in particular to a sulfonated polystyrene flame retardant and a low-halogen flame-retardant polypropylene material. [Background technique] [0002] Flame-retardant polypropylene has broad application prospects, and the flame retardants used are usually brominated flame retardants, such as decabromodiphenyl ether, decabromodiphenylethane, octabromodiphenyl ether, etc. Brominated flame retardants are generally used in combination with antimony trioxide. In order to achieve the UL 94 VO level, this type of flame retardant is added in a relatively high proportion, and the total amount usually reaches 25-30%. The flame retardant polypropylene made of this series of flame retardants has a high cost and a large specific gravity (37-40% higher than the original resin), and the mechanical properties of the material are also significantly reduced due to the addition of a large amount of flame retardants....

AI Technical Summary

Problems solved by technology

The flame retardant polypropylene made of this series of flame retardants has a high cost and a large specific gravity (37-40% higher than the original resin), and the mechanical properties of the material are also significantly reduced due to the addition of a large amount of flame retardants. In addition, the flame retardant The addition of additives loses the original transparency of PP resin, which greatly limits its application field

However, sulfonate flame retardants on the market are usually used in polycarbonate flame retardant systems, and have poor compatibility with polyolefin resins.

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