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
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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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