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Method for preparing bromination polystyrene

A technology of brominated polystyrene and polystyrene dichloroethane, which is applied in the field of preparing brominated polystyrene, can solve problems such as the controllable molecular weight of brominated polystyrene, and achieve thermal stability Improvement, stable decomposition reaction, and the effect of saving production costs

Active Publication Date: 2012-06-20
SHANDONG RUNKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above patents, most of them are to improve the bromination reaction of polystyrene and bromine and the subsequent production process to obtain brominated polystyrene with better product quality, without fundamentally considering the final production of brominated polystyrene by controlling the molecular weight of styrene. Achieving Molecular Weight Control of Brominated Polystyrene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 10 g of styrene to 100 g of dichloroethane, stir and mix to dissolve; add 0.1 g of BPO, and react at 30°C for 3 hours to obtain a polystyrene dichloroethane solution.

[0019] Under the controlled temperature of 0°C, add 100g of dichloroethane into the bromine chloride bottle, then add 122g of bromine, slowly feed 55g of chlorine gas, and react to prepare bromine dichloroethane solution.

[0020] Adjust the temperature of the polystyrene dichloroethane solution to 5°C, add 0.1g aluminum tribromide and 0.1g tin tetrachloride, stir and mix evenly; add 30g dropwise to the polystyrene dichloroethane solution in the dark Chlorinated bromodichloroethane solution, the temperature was controlled at 5°C during the dropwise addition, and the temperature was slowly raised to 40°C for 20 hours after the dropwise addition was completed.

[0021] After the reaction is over, first add 1g of sodium sulfite to the solution to neutralize the unreacted bromine chloride, then adjust th...

Embodiment 2

[0024] Add 30g of styrene to 100g of dichloroethane, stir to mix and dissolve; add 0.3g of BPO, and react at 60°C for 2 hours to prepare polystyrene dichloroethane solution.

[0025] Under the controlled temperature of 0°C, add 100g of dichloroethane into the bromine chloride bottle, then add 122g of bromine, slowly feed 55g of chlorine gas, and react to prepare bromine dichloroethane solution.

[0026] Adjust the temperature of the polystyrene dichloroethane solution to 25°C, add 1.5g aluminum tribromide and 1.5g tin tetrachloride, stir and mix evenly; add 60g dropwise to the polystyrene dichloroethane solution in the dark Chlorinated bromodichloroethane solution, the temperature was controlled at 25°C during the dropwise addition, and the temperature was slowly raised to 50°C for 15 hours after the dropwise addition was completed.

[0027] After the reaction is over, first add 1g of sodium sulfite to the solution to neutralize the unreacted bromine chloride, then adjust the ...

Embodiment 3

[0030] Add 50g of styrene to 100g of dichloroethane, stir to mix and dissolve; add 0.5g of BPO, and react at 100°C for 1 hour to prepare polystyrene dichloroethane solution.

[0031] Under the controlled temperature of 0°C, add 100g of dichloroethane into the bromine chloride bottle, then add 122g of bromine, slowly feed 55g of chlorine gas, and react to prepare bromine dichloroethane solution.

[0032] Adjust the temperature of the polystyrene dichloroethane solution to 50°C, add 3g of aluminum tribromide and 3g of tin tetrachloride, stir and mix evenly; add 90g of polystyrene dichloroethane solution dropwise in the dark For the bromodichloroethane solution, the temperature was controlled at 50°C during the dropwise addition, and the temperature was slowly raised to 60°C for 10 hours after the dropwise addition was completed.

[0033] After the reaction is over, first add 1g of sodium sulfite to the solution to neutralize the unreacted bromine chloride, then adjust the pH val...

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Abstract

The invention discloses a method for preparing bromination polystyrene, which includes (1) adding 10-30 parts by weight of styrene into 100 parts by weight of dichloroethane and adding 0.1 to 0.5 parts by weight of BPO or AIBN to obtain polystyrene dichloroethane solution; (2) adding 0.1 to 3 parts by weight of lewis acid catalyst and 0.1 to 3 parts by weight of backbone protective agent in the above prepared solution and then dropping 30 to 90 parts of bromine chloride dichloroethane solution to obtain bromination polystyrene dichloroethane solution; (3) adding 00.5 to 0.1 parts by weight ofneutralizer into the above prepared solution, conducting washing and static layering, adding 0.1 to 3 parts by weight of fat removing bromine preventing agent in the layered organic layers, conducting flash evaporation, cooling, centrifugation and drying on the organic layer to obtain the product. The process is capable of manufacturing polystyrene with narrow molecular weight distribution, and the polystyrene can obtain bromination polystyrene with controllable molecular weight after bromination.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, and in particular relates to a method for preparing brominated polystyrene. 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 miscibility in polymers, and is easy to process. No frost, its thermal decomposition temperature is greater than 310°C, it is an ideal flame retardant for processing engineering plastics such as nylon, PBT, PET, ABS, PC, etc. In addition, brominated polystyrene does not release carcinogens such as dioxins when burned, and is a substitute for polybrominated diphenyl ether flame retardants. [0003] At present, the mainstream production method of brominated polystyrene is the solvent method, that is, polystyrene is dissolved in ethylene dichloride, and in the presence of cocatalyst and catalys...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F8/20
Inventor 宗先庆
Owner SHANDONG RUNKE CHEM
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