Method for preparing EPT rubber graft by emulsion method
A technology of EPDM rubber and graft, which is applied in the field of polymer chemistry, can solve the problems of difficult heat transfer, large consumption of solution polymerization solvent, etc., and achieves stable polymerization reaction process, production cost saving, and high grafting efficiency. Effect
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Embodiment 1
[0024] First, add EPDM rubber / n-hexane mucilage 92g (solid content 9.873% (mass fraction)) in the there-necked flask, styrene 30g, acrylonitrile 10g, disproportionated rosin 5.28g; Weigh 2.64g potassium hydroxide, Dilute with 50g of deionized water and add to the constant pressure dropping funnel, assemble the constant pressure dropping funnel, three-neck flask, inert gas protection tube and high-speed stirrer, and connect the inert gas tube to below the oil phase liquid level. Open the inert gas protection tube, fully replace the air in the three-necked bottle, start stirring, the shear rate is 6000r / min, first mix the oil phase evenly, then open the constant pressure dropping funnel, and add dropwise at a speed of 1-8 drops / s Potassium hydroxide aqueous solution was emulsified while being saponified, and a total of 150 g of deionized water was added. During the emulsification process, it can be clearly seen that the continuous phase of the system changes from an oil phase to ...
Embodiment 2
[0028]First, add EPDM rubber / n-hexane mucilage 62g (solid content 14.65% (mass fraction)) in there-necked flask, dissolve disproportionated rosin 5.28g with 30g n-hexane, join in the there-necked flask after dissolving; Dilute 2.64g of potassium hydroxide with 50g of deionized water and add it to the constant pressure dropping funnel. Assemble the constant pressure dropping funnel, three-necked flask, inert gas protection tube and high-speed stirrer, and connect the inert gas tube to the oil phase below the liquid level. Open the inert gas protection tube, fully replace the air in the three-necked bottle, start the stirring, first mix the oil phase evenly, then open the constant pressure dropping funnel, add potassium hydroxide aqueous solution dropwise at a speed of 1-8 drops / s, and saponify while For emulsification, add 150g of deionized water in total. During the emulsification process, it can be clearly seen that the continuous phase of the system changes from an oil phase...
Embodiment 3
[0032] The amount of material added is the same as in Example 2, the shear rate during emulsification is 10000r / min, 30g of styrene and 10g of acrylonitrile mixed monomers are added at once after the temperature of the emulsion system rises to 65°C, and the initiator potassium persulfate is 0.32g ( Dissolve it with 10g of deionized water) After the system temperature rises to 65°C, add it all at once. After 10 hours of reaction, the reaction was stopped, and the monomer conversion rate was measured to be 61.16%. Pour the emulsion in the reactor into a beaker to cool.
[0033] Configure a glacial acetic acid aqueous solution with a pH of 3, add glacial acetic acid to break the emulsion while stirring the emulsion in the beaker, wash and dry to obtain 38.83 g of the product, use acetone as the extraction agent, and use the Soxhlet extraction method to obtain styrene-ternary The graft rate of ethylene propylene rubber-acrylonitrile graft was 192.6%, and the graft efficiency was ...
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