Study On The Phase Conversion Of ABS Resins In Continuous Bulk Polymerization

ABS resins is a thermoplastic polymer mixture with a very broad application prospects, ABS resins have excellent impact resistance and mechanical strength. Which is widely used in automotive, household appliances and office equipment, building materials and other field. The main methods for producing ABS resins currently are emulsion graft-bulk blending polymerization and continuous bulk polymerization. Due to its pure product, no waste water pollution, the continuous bulk polymerization have broad development prospects. In this paper, we study the four rubber with a continuous bulk polymerization method, and develop high flow ABS resins. Lay the foundation of high flow ABS resins by studying bulk ABS polymerization kinetics, phase inversion, rubber particle size distribution of different rubber in a plug flow reactor. We successfully prepared products in a pilot plant, and verified the polymerization process.By analysis the four rubber sample, it is confirmed that P30AF and A35AE are low-cis PB rubbers, A35AE is linear structure while P30AF is star structure with bimodal distribution. T2000A and T2003 are styrene butadiene copolymer rubber. The styrene content of T2000A and T2003 is 15.4% and 16.1%, the block polystyrene of them is 5.39% and 11.43%.It is investigated that when prepare ABS resins with single or compound rubber with mass ratio of 1:1, the low-cis PB rubber is faster than styrene-butadiene rubber in rate of polymerization. Since the block of styrene reduces the viscosity of the system and avoid the generation of the gel effect. Vinyl 1,2 structure is the main site of rubber graft reactions, it contributes to improve graft efficiency, accelerate the rate of polymerization. Phase conversion studies have shown that, the phase conversion of star low-cis PB rubber is earlier than styrene-butadiene rubber. The phase transition of A35AE is the most significant, the phase conversion of compound rubber is significantly expand than single rubber. The rubber particle size of low-cis PB is relatively larger than SBR. The rubber particle size of P30AF/T2000 compound rubber is bimodal distribution.Refer to Dow ABS resins process and the results of the laboratory work, we raise preparation process of bulk high flow ABS resins. We prepared lots of ABS resins with middle impact and high MFR with block SBR 1322 and star butadiene rubber 565T and the four rubber and their compound rubber. We analyzed their performance, the results show that high flow bulk ABS resins is prepared by compound rubber. Styrene-butadiene block copolymer and star low-cis PB complex in mass ratio 8.5:3.5 is the most appropriate. The compound rubber of styrene-butadiene copolymer 1322 and P30AF can successfully develop high flow ABS resins.