Flocculating agent for agglomerating rubber latex and its production method

摘要

The flocculant of the present invention comprises a first step of forming an aggregation nucleus by batch polymerization so that the alkyl acrylate, anionic surfactant and anionic initiator having a carbon number of 1 to 12 are converted so as to have a conversion of not less than 90% A second step of adding an alkyl acrylate and an ionic comonomer to the flocculant to grow a flocculant by semi-batch polymerization, and a step of adding alkyl acrylate, an ionic comonomer and a second initiator to the polymer of the second step, And a third step for copolymerizing the ionic comonomer which is a functional monomer. The flocculant of the present invention comprises 0.1 to 0.5 parts by weight of an ionic comonomer, 0.5 to 4.0 parts by weight of an anionic surfactant, and 0.3 to 2.0 parts by weight of an anionic initiator, based on 100 parts by weight of the alkyl acrylate. Less than about 5% of the total alkyl acrylate is used in the first stage, about 90% of the total is used in the second stage, and the remaining alkyl acrylates are used in the third stage. 5 to 20% of the total of the ionic comonomers are used in the second stage, and about 80 to 95% of the total is used in the third stage. 90 to 70% of the total of the anionic initiator is used in the first stage, and 10 to 30% of the total is used in the third stage. To agglomerate the rubber latex, 0.1 to 5.0 parts by weight of the flocculant is mixed per 100 parts by weight of the rubber latex.;mj / 50-25