Brominated chlorinated polybutadiene/styrene flame retardant and preparation method and application thereof

Abstract

The invention provides a brominated chlorinated polybutadiene / styrene flame retardant. The thermal weight loss temperature of-1% is 237-243 DEG C, and the thermal weight loss temperature of-5% is 258-261 DEG C. The invention also provides a preparation method and application of the flame retardant. The brominated chlorinated polybutadiene / styrene flame retardant uses two elements of bromine and chlorine to halogenate SBS so that the cost of the flame retardant is lower than that of a brominated flame retardant; the brominated chlorinated polybutadiene / styrene flame retardant is high in thermalstability and can be used as a substitute of HBCD to be applied to polystyrene foam materials; the yield of the brominated chlorinated polybutadiene / styrene flame retardant is 96.4-98.0%; the preparation process is a green synthesis process, the amount of waste liquid is low and the reaction speed is high.

Description

technical field [0001] The invention relates to a brominated chlorinated polybutadiene / styrene flame retardant and its preparation method and application, belonging to the technical field of flame retardants. Background technique [0002] Hexabromocyclododecane (HBCD) is a high-efficiency brominated flame retardant widely used in polystyrene foam insulation materials and textile coatings, but because HBCD is a persistent organic The stockholm convention control list of pollutants is being banned by countries all over the world. The flame retardant used to replace HBCD should have the characteristics of high efficiency, low toxicity, good thermal stability, heat resistance and migration resistance. [0003] Patent CN101305022B proposes a thermally stabilized brominated polybutadiene / vinyl aromatic copolymer (brominated SBC), which has good thermal stability, and its 5% thermal weight loss temperature is greater than 210 ° C, preferably greater than 225 ℃. The brominating a...

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Problems solved by technology

The brominating agent of brominated SBC is pyridinium tribromide, and the by-product is pyridinium monobromide, such as tetrabutylammonium bromide because of its high solubility in the reaction solvent and aqueous phase, so that the by-product Product recovery is difficult

In Example 1-18 of patent CN101305022B, it is pointed out that toluene is added to furan in order to better separate the by-product pyridinium hydrobromide, and a mixed solution of furan, toluene and methanol three-phase coexistence is formed through methanol crystallization, which increases the subsequent Difficulty in solvent separation, large amount of waste water, high product cost

In order to solve the above problems, complex process measures can be adopted as in CN200980114783.3 to realize the separation and reuse of solvents, but the equipment investment is large and the process is complicated

[0004] Another problem in the brominated SBC proposed by the patent CN101305022B is: when using tetrabutylammonium tribromide as the brominating agent, when the conversion rate of 70-80% is reached, the bromination reaction slows down sharply and takes a long time To achieve a high conversion rate, which will bring side reactions and increase equipment investment

[0008] However, commonly used chlorine-based flame retardants, such as tetrachlorobisphenol A, chlorinated paraffin, bromochloroparaffin, chlorinated polyethylene, chlorinated rubber, etc., have insufficient thermal stability on the one hand, and are used for flame retardant of polymer materials. , it is easy to cause the decomposition of the flame retardant, which deteriorates the performance of the product; on the other hand, because the carbon-chlorine bond energy is greater than the carbon-bromine bond energy, the efficiency of the chlorine-containing flame retardant is not high, and the effect is not good.

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