Study On The Preparation Of Different Latexes With Large Particle Size

The most common method of preparing ABS resin is emulsion grafting-blend production. But the key technology is to enlarge the particle size of the latex. In the paper, the continuous distribution and bimodal SIBL latex were prepared by seed emulsion and macromolecule emulsifier.The SIBL with continuous were prepared by the method of seed emulsion polymerization, the viscosity of SIBL is much less than the viscosity of PB latex, it is usefull for the mass and heat transfer in the graft polymerization, the lower viscosity is useful for stabilizing the emulsion polymerization, which enhance the safety fator in the commercial process process.The preparation of bimodal SIBL needs less time, it is usefull for the factory to increase the profit. In this paper, the SIBL was prepared with large particle by the method of seed emulsion polymerization, the ABS resin has perfect performance, which was prepared by SIBL, the performance of impact resistance and rigidity is better than the ABS that was prepared by PB latex. So the ABS that was prepared by SIBL has a wide industrial application.In this paper, using persulfate as initiator, using styrene、 isoprene and butadiene as monomers, the SIBL was prepared by the method of seed polymerization. The product was random distribution terpolymer, not the homopolymer or every two copolymer, which was proved by infrared, 1H NMR and DSC spectrogram. The Tg ranged from -83.13℃ to-45.41℃ and the gel content ranged from 60.08% to 82.46% by changing the composition of monomer mixture.The effects of seed、initial and additional emulsifier、 electrolyte were examined on the diameter of the latex. The results show that the diameter of latex increased when the dosage of the seed、initial and additional emulsionfier were reduced and the dosage of electrolyte was increased. The latex was prepared, which the diameter of the latex is 330nm by changing the above conditions. The latex was 400nm, when the mactomolecule emulsifier was added to the emulsion system. In this article, using macromolecule emulsifier technology to achieve the goal of agglomeration of ternary latex. Studying the influence of the amount of macromolecule emulsifierm, emulsifier, stirring speed and temperature on the latex particle. The result shows the agglomeration technology can achieve the SIBL larger particle size, particle size from 100nm to 300nm.In the graft polymerization of styrene and acrylonitrile, the CHP-FeSO4 which was oxidation-reduction system was used to initiate the polymerization. The graft degree is very closed between the SIBL and PB latex. The ABS resin was manufactured by twin-screw extruder with the ABS graft copolymer and SAN resin as material. The energy factor of ABS resin was examined by the instrumented impact curves, the results showed that the hardness-toughness factor of the ABS resin which was prepared by SIBL is higher than the PB latex. So the comprehensive performance of SIBL is better than the PB latex. The toughening effects of bimodal SIBL is better than the continuous distribution rubber.