Brominated multi-block copolymer flame retardant with medium molecular weight and two-step preparation method for emulsion thereof

A brominated multi-block and copolymer technology, applied in the field of polymer flame retardants, can solve the problems of no multi-block structure, single structure, low bromine content, etc., and achieves easy and uniform dispersion, good flame retardant effect, The effect of high bromine content

Inactive Publication Date: 2018-07-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] These high-molecular-weight brominated PS and brominated SBS have low bromine content, while the low- and medium-molecular-weight brominated PS has a single molecular chain structure and does not have a multi-block structure

Method used

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  • Brominated multi-block copolymer flame retardant with medium molecular weight and two-step preparation method for emulsion thereof
  • Brominated multi-block copolymer flame retardant with medium molecular weight and two-step preparation method for emulsion thereof
  • Brominated multi-block copolymer flame retardant with medium molecular weight and two-step preparation method for emulsion thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, a kind of preparation method of medium molecular weight brominated polymer flame retardant:

[0039]1. Using styrene and 1,4-butadiene as polymerization monomers, azobisisobutyronitrile (AIBN) as initiator, bis(α,α'-dimethyl-α”-acetic acid trithiocarbonate ) ester is a chain transfer agent, and sodium lauryl sulfate is an emulsifier, and obtains medium molecular weight styrene-butadiene-styrene triblock copolymer by two-step polymerization, and the steps are as follows:

[0040] (1), 150 grams of H 2 O and 0.88 grams of sodium lauryl sulfate were added to the reaction kettle, and after stirring evenly, 10 grams of 1,4-butadiene and 0.5 grams of trithiocarbonic acid bis(α,α'-dimethyl-α"-acetic acid ) ester, under the protection of nitrogen, the temperature was raised to 60°C, and 0.01 g of azobisisobutyronitrile (AIBN) was added to insulate and react for 2 hours to obtain a butadiene homopolymer with a degree of polymerization of 96 and a molecular weight ...

Embodiment 2

[0044] Embodiment 2, a kind of preparation method of medium molecular weight brominated polymer flame retardant:

[0045] 1. Using styrene and isoprene as polymerization monomers, azobisisobutylimidazoline hydrochloride (AIBI) as initiator, trithiocarbonic acid bis(α,α'-dimethyl-α”- Acetate) ester is a chain transfer agent, and sodium dodecylbenzenesulfonate is an emulsifier, and obtains medium molecular weight styrene-isoprene-styrene triblock copolymer by two-step polymerization, and the steps are as follows:

[0046] (1), 150 grams of H 2 O and 2.6 grams of sodium dodecylbenzenesulfonate were added to the reactor, and after stirring evenly, 35 grams of isoprene and 0.8 grams of trithiocarbonic acid bis(α,α'-dimethyl-α"-acetic acid) were added Esters, under the protection of nitrogen, the temperature was raised to 65 ° C, and 0.016 g of azobisisobutylimidazoline hydrochloride (AIBI) was added to keep the temperature for 4 hours to react to obtain an isoprene homopolymer wit...

Embodiment 3

[0050] Embodiment 3, a kind of preparation method of medium molecular weight brominated polymer flame retardant:

[0051] 1. Using styrene and isoprene as polymerization monomers, azoisobutylcyanoformamide (V30) as initiator, bis(α,α'-dimethyl-α”-valeric acid trithiocarbonate ) ester is a chain transfer agent, polyoxyethylene sorbitan fatty acid ester T-80 is an emulsifier, and a medium molecular weight styrene-isoprene-styrene triblock copolymer is obtained by two-step polymerization, and the steps are as follows :

[0052] (1), 150 grams of H 2 O and 6.4 grams of polyoxyethylene sorbitan fatty acid ester T-80 were added to the reaction kettle, and after stirring evenly, 100 grams of isoprene, 1.0 grams of trithiocarbonic acid bis(α,α'-dimethyl- α”-valeric acid) ester, under the protection of nitrogen, heat up to 70°C, add 0.02 g of azoisobutylcyanoformamide (V30) and keep it warm for 6 hours to obtain an isoprene homopolymer with a degree of polymerization of 382 , the mo...

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Abstract

The invention discloses a two-step preparation method for an emulsion of a brominated multi-block copolymer flame retardant with medium molecular weight (a polymerization degree of 150 to 790). According to the invention, a reversible addition-fragmentation chain transfer (RAFT) polymerization method is adopted for preparation, and a styrene-diolefin-styrene triblock copolymer with medium molecular weight is obtained by polymerization through a two-step method with styrene and diolefin as polymerization monomers, an azo compound or an organic peroxide as an initiator and a trithioester derivative as a chain transfer agent; and after the copolymer is brominated with a brominating agent, the brominated multi-block copolymer flame retardant with medium molecular weight is obtained, i.e., a brominated styrene-diolefin-styrene triblock copolymer bromine-based flame retardant with medium molecular weight is obtained. The flame retardant provided by the invention has high bromine content andgood flame retardation effect.

Description

technical field [0001] The invention relates to the field of polymer flame retardants, in particular to a brominated medium molecular weight styrene-diene-styrene triblock copolymer flame retardant and a preparation method thereof. Background technique [0002] Brominated flame retardants can meet the flame retardant requirements of various polymer materials due to their high flame retardant efficiency and good thermal stability, and their raw materials are abundant and cheap. They are currently the most widely used flame retardants in the market. One of the fuels. However, the currently commonly used small molecule brominated flame retardants (molecular weight less than 500, such as polybrominated diphenyl ethers, etc.) usually have the disadvantage of being easily precipitated from the polymer material matrix, and they will produce carcinogens such as dioxins when burned, resulting in Environmental problems, and the long-chain structure of polymer brominated flame retarda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F8/20C08L77/00C08L25/06C08L67/00C08L55/02C08L53/02C08K3/22
CPCC08F8/20C08F2438/03C08L55/02C08L77/00C08L2201/02C08L2205/035C08F293/00C08L25/06C08L67/00C08L53/025C08K3/2279
Inventor 姚臻杨文龙曹堃
Owner ZHEJIANG UNIV
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