MMW (medium molecular weight) bromine-containing segmented copolymer flame retardant and three-step emulsion preparation method thereof
A multi-block copolymer and molecular weight technology, applied in the field of polymer flame retardants, can solve the problems of no multi-block structure, single structure, and low bromine content, and achieve easy and uniform dispersion, good flame retardant effect, and bromine The effect of high content
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Embodiment 1
[0042] Embodiment 1, a kind of preparation method of medium molecular weight brominated polymer flame retardant:
[0043] 1. Using tribromostyrene, pentabromostyrene and 1,4-butadiene as polymerization monomers, azobisisobutyronitrile (AIBN) as initiator, 4-cyano-4-(thiobenzo Acyl) valeric acid is a chain transfer agent, and sodium lauryl sulfate is an emulsifier, and obtains medium molecular weight brominated styrene-butadiene-brominated styrene triblock copolymer by three-step polymerization, and the steps are as follows:
[0044] (1), 150 grams of H 2 0 and 7.8 gram sodium lauryl sulfates add in the reactor, add 80 gram tribromostyrenes after stirring, 5 gram 4-cyano groups-4-(thiobenzoyl) pentanoic acid, under nitrogen protection, After heating up to 60°C, adding 0.1 g of azobisisobutyronitrile (AIBN) to react for 2 hours, a brominated styrene homopolymer with a degree of polymerization of 12 was obtained;
[0045] (2) Under the protection of nitrogen, add 65 grams of 1,...
Embodiment 2
[0049] Embodiment 2, a kind of preparation method of medium molecular weight brominated polymer flame retardant:
[0050] 1. Use pentabromobenzyl acrylate and isoprene as polymerization monomers, azobisisobutylimidazoline hydrochloride (AIBI) as initiator, and S-(thiobenzoyl)thioglycolic acid as chain transfer agent , sodium dodecylbenzenesulfonate is an emulsifier, and a medium molecular weight brominated acrylate-isoprene-brominated acrylate triblock copolymer is obtained by three-step polymerization, and the steps are as follows:
[0051] (1), 150 grams of H 2 0 and 3.76 grams of sodium dodecylbenzenesulfonate are added in the reactor, and after stirring, 26 grams of pentabromobenzyl acrylate are added, 1.0 grams of S-(thiobenzoyl) mercaptoacetic acid, under nitrogen protection, the temperature is raised to After adding 0.02 g of azobisisobutylimidazoline hydrochloride (AIBI) at 65°C for 4 hours, a brominated acrylate homopolymer with a degree of polymerization of 12 was o...
Embodiment 3
[0056] Embodiment 3, a kind of preparation method of medium molecular weight brominated polymer flame retardant:
[0057] 1. Using pentabromobenzyl acrylate, pentabromostyrene, and 1,4-butadiene as polymerization monomers, azoisobutylcyanoformamide (V30) as the initiator, and phenyldithioacetic acid-1- Phenylethyl ester is used as chain transfer agent, polyoxyethylene sorbitan fatty acid ester T-80 is used as emulsifier, and medium molecular weight brominated styrene-butadiene-brominated acrylate triblock is obtained by three-step polymerization Copolymer, the steps are as follows:
[0058] (1), 150 grams of H 2 O and 5.2 gram polyoxyethylene sorbitan fatty acid ester T-80 add in the reaction kettle, add 40 gram pentabromostyrenes after stirring, 0.8 gram phenyldithioacetate-1-phenyl ethyl ester, in Under the protection of nitrogen, the temperature was raised to 70°C, and 0.016 g of azoisobutylcyanoformamide (V30) was added to react for 6 hours to obtain a brominated styrene...
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