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Brominated block copolymers as flame retardants and process for their preparation

A block copolymer and block copolymerization technology, applied in the field of block copolymers, can solve problems such as environmental hazards and biological health, and achieve good compatibility, good processing performance, and excellent thermal stability

Active Publication Date: 2018-09-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, concerns over the potential harm to the environment and biological health of these small molecule bromides have led to calls to restrict or even ban their use

Method used

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  • Brominated block copolymers as flame retardants and process for their preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In a 5L glass kettle, add 2000 mL of solvent cyclohexane and 10 g of butadiene, use a constant temperature water bath to raise the temperature of the reaction system to 50 ° C, and then add dilithium butane Li (CH 2 ) 4 Li initiator 2.2mL, keep the constant temperature water bath at 50°C for 50 minutes, then add 170g of isoprene, keep the constant temperature water bath at 50°C for 30 minutes, then add 20g of styrene, keep the constant temperature water bath at 50°C for another 30 minutes, then Methanol 0.1 mL was added. After removing the solvent, the base block copolymer was obtained with a number average molecular weight of 9.8×10 4 g / mol, 1,2-butadiene structural units account for 10.0% by weight of the total amount of butadiene monomer units, and 3,4-isoprene structural units account for 9.8% by weight of the total amount of isoprene monomer units %.

[0060] In a 10L stainless steel reaction kettle coated with polytetrafluoroethylene lining, the obtained basic ...

Embodiment 2

[0063] In a 5L glass kettle, add 2000 mL of solvent cyclohexane and 20 g of butadiene, use a constant temperature water bath to raise the temperature of the reaction system to 50 ° C, and then add dilithium butane Li (CH 2 ) 4 Li initiator 4.2mL, keep the constant temperature water bath at 50°C for 50 minutes, then add 160g of isoprene, keep the constant temperature water bath at 50°C and continue the reaction for 30 minutes, then add 20g of styrene, keep the constant temperature water bath at 50°C and continue the reaction for 30 minutes, then Methanol 0.1 mL was added. After removing the solvent, the base block copolymer was obtained with a number average molecular weight of 10.3×10 4 g / mol, 1,2-butadiene structural units account for 9.5% by weight of the total amount of butadiene monomer units, and 3,4-isoprene structural units account for 9.6% by weight of the total amount of isoprene monomer units %.

[0064] In a 10L stainless steel reaction kettle coated with polytet...

Embodiment 3

[0067] In a 5L glass kettle, add 2000 mL of solvent cyclohexane and 30 g of butadiene, use a constant temperature water bath to raise the temperature of the system to 50 ° C, and then add dilithium butane Li (CH 2 ) 4 Li initiator 1.2mL, keep the constant temperature water bath at 50°C for 50 minutes, then add 140g of isoprene, keep the constant temperature water bath at 50°C and continue the reaction for 30 minutes, then add 30g of styrene, keep the constant temperature water bath at 50°C and continue the reaction for 30 minutes, then Methanol 0.1 mL was added. After removing the solvent, the base block copolymer was obtained with a number average molecular weight of 10.5×10 4 g / mol, 1,2-butadiene structural units account for 9.4% by weight of the total amount of butadiene monomer units, and 3,4-isoprene structural units account for 9.2% by weight of the total amount of isoprene monomer units %.

[0068] In a 10L stainless steel reaction kettle coated with polytetrafluoroe...

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Abstract

The invention relates to a brominated segmented copolymer. A segmented copolymer is a basic segmented copolymer shown as the formula S1-I1-B-I2-S2 before bromination. S1 and S2 independently represent styrene segments, I1 and I2 independently represent isoprene segments, B represents a butadiene segment, after the basic segmented copolymer is brominated, unsaturated carbon-carbon double bonds contained in the isoprene segments I1 and I2 account for at least 40 mol%, and at most 95 mol% is brominated. Unsaturated carbon-carbon double bonds contained in the butadiene segment B account for at least 5 mol%, and at most 40 mol% is brominated. The invention further relates to a method for preparing the brominated segmented copolymer. The method includes the step that a solution of the basic segmented copolymer shown as the formula S1-I1-B-I2-S2 reacts with a brominating agent. The brominated segmented copolymer has excellent heat stability and good compatibility and good processing performance with other polymers. The method can achieve preferential selective bromination of isoprene monomer units in the basic segmented copolymer shown as the formula S1-I1-B-I2-S2.

Description

technical field [0001] This invention relates to brominated block copolymers of styrene, butadiene and isoprene as flame retardants and methods for their preparation. Background technique [0002] Brominated compounds such as hexabromododecane, decabromodiphenyl ether, and tetrabromobisphenol A are often used as flame retardants for polymers. However, due to concerns about the potential harm to the environment and biological health of these small molecule bromides, there have been calls to restrict or even ban their use. However, it is foreseeable that brominated flame retardants will not be completely banned in the future, especially in the application fields of electronic and electrical products. [0003] Macromolecular bromide flame retardants are more environmentally friendly and less harmful to biological health, and are an option to replace small molecule bromide flame retardants. [0004] Block copolymers of conjugated dienes and styrene generally include styrene-bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/04C08F8/20
Inventor 徐宏德郑国军包巧云钟林周爱霞
Owner CHINA PETROLEUM & CHEM CORP