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Method of preparing high-heat stability bromized polystyrene

A technology of brominated polystyrene and high thermal stability, which is applied in the field of preparation of brominated polystyrene with high thermal stability, can solve the problems of yellowish color, limited application range, low thermal stability of brominated polystyrene, etc., and achieve White color, improved thermal stability, uniform particle effect

Active Publication Date: 2008-12-10
天津海晶科技发展有限公司
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Problems solved by technology

This method is simple in process, low in cost, and easy for large-scale production, but the obtained brominated polystyrene has low thermal stability and yellowish color, which limits its application range

Method used

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  • Method of preparing high-heat stability bromized polystyrene
  • Method of preparing high-heat stability bromized polystyrene

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preparation example Construction

[0017] The preparation method of high thermal stability brominated polystyrene of the present invention comprises the following steps:

[0018] ①Dissolve polystyrene in a solvent, add 5-10% of polystyrene mass main chain alkyl protecting agent, stir for 0.5h, then add 5-10% polystyrene mass catalyst;

[0019] 2. add bromine chloride in the polystyrene solution that step 1. obtains, and polystyrene is 1: 3.4~1: 4 with the mass ratio of bromine chloride, and the temperature of bromination reaction is controlled at 0~40 ℃, and the reaction time is 3~40℃. 4.5 hours;

[0020] 3. step 2. After the reaction finishes, neutralize excessive bromine chloride, free bromine and the hydrogen chloride substance that generates with alkaline solution, then obtain the organic phase through washing and separation;

[0021] ④ Add the organic phase obtained in step ③ into water with a temperature of 80 to 100 ° C and a dispersant containing 1% brominated polystyrene mass to recover dichloroethane...

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Abstract

The invention provides a method for preparing polystyrene bromide with high thermal stability. The polystyrene bromide is prepared by adoption of polystyrene and bromine chloride as raw materials and alkylogen as a solvent, under the action of a catalyst and a main-chain alkyl protectant, and through bromination reaction; and a dispersant is added during the process of solvent separation and polystyrene bromination, so as to make polystyrene bromide particles obtained uniform. The polystyrene bromide prepared by the method has the characteristics that: the polystyrene bromide is white powder or particles; the bromine content is between 66 and 68 percent; and the thermal decomposition temperature (1 percent of thermal weight loss) is more than 310 DEG C. The method solves the problems in the aspects of color and thermal stability in the prior domestic polystyrene bromide products, and improves the product quality of the polystyrene bromide.

Description

technical field [0001] The invention relates to the preparation technology of brominated polystyrene, in particular to a preparation method of brominated polystyrene with high thermal stability. Background technique [0002] As an additive brominated flame retardant, brominated polystyrene (BPS) has the advantages of large molecular weight, high bromine content and good thermal stability, and has good dispersibility and compatibility in polymers, and is easy to process , no frosting, and its thermal decomposition temperature is greater than 310 ° C, it is an ideal flame retardant for processing thermoplastic engineering resins such as PET, ABS, and nylon. In addition, brominated polystyrene does not release carcinogens such as dioxins when burned, and is a substitute for polybrominated diphenyl ethers (PBDEs) flame retardants. [0003] At present, there are only three foreign companies that have realized the commercial production of BPS, the Great Lakes Company of the Unite...

Claims

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Application Information

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IPC IPC(8): C08F8/20C08F112/08
Inventor 张德强魏炳举李萌杨树娥杨桂枝王鹤童麻炳辉王丹
Owner 天津海晶科技发展有限公司
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