Preparation Of ABS Resin With High Performance And New Application Of Its Intermediate

ABS resin is a rubber-toughened thermoplastic material which was polymerized by three kinds of monomers:acrylonitrile (AN), styrene (ST) and butadiene (BD). The typical micro structure of ABS resin was shown as which rubbery polybutadiene (PB) particles were uniformly dispersed into the continuous phase of poly (ST-co-AN)(SAN). With the rapid development of science and material industry, the requirement for production of higher performance and lower cost of ABS resin is increased continuously even though massive industrialization production of ABS resin has been achieved in China. Therefore, the research and development of high performance ABS resin made great sense.In this thesis, the technological survey of ABS resin, the technological progress of ABS resin with bimodal distribution of rubber particles, the technological features of panel grade ABS resin, and the technological requirements of ABS resin in preventing thermal-oxidative aging, as well as the preparation and application of spherical polyelectrolyte brushes based on ABS intermediate were summarized. The main research works were:(1) ABS resins with bimodal distribution of rubber particles were prepared by bi-seeded emulsion grafting copolymerization, and their performance was compared with those with unimodal distribution of rubber particles.(2) Panel grade ABS resin with high impact resistance and high melt viscosity was prepared by three process routes. The effects of grafting ratio, grafting chain length and rubber phase content on impact strength, tensile strength, melt index and micromorphology of ABS resin were investigated.(3) Hindered phenol antioxidants, Irganox1076and Irganox245, were combined with thioester antioxidant DLTP, respectively. The stabilization and synergistic effect of the antioxidant on ABS resin were investigated.(4) Spherical polyelectrolyte brushes were synthesized by using ABS intermediate polybutadiene (PB) colloidal particles as core. With the brush as a nanoreactor, nanoparticles of Ni, Co and Ag were obtained and being used as catalysts to catalyze the model reduction reaction of p-nitrophenol into p-aminopheno.The main results were showed as follows:(1) The bimodal distribution ABS resin (HL-ABS) displayed better performance than unimodal distribution one (L-ABS). HL-ABS achieved the best performance at large-sized PB colloidal particles (H-PBL,575nm) ratio of10.0%. Keeping the same rubber content, HL-ABS had higher impact strength than L-ABS and almost the same tensile strength. Keeping the same impact strength, HL-ABS had higher tensile strength with less rubber content compared to L-ABS. The L-ABS intrinsic equilibrium restriction of toughness and rigidity was overcome by using two different size rubber particles for the rubbery phase, and the synergistic effect of the large and the small rubber particles was the essential reason why bimodal distribution ABS resin HL-ABS displays higher performance than L-ABS.(2) Panel grade ABS resins were prepared successfully by the process route (Treating mixed rubber particles of H-PBL and320nm large-sized PBL (L-PBL) as basic rubber particles, blending ABS grafting powder with bimodal distribution of rubber particles (HL-PB-g-SAN) with SAN-32). When PB content was18.5%, all the performance including impact strength, tensile strength, breaking elongation and melt index could match the property requirements of panel grade ABS resin, and the resulted panel grade ABS resin product was applied successfully to refrigerator internal bladder with favorable processing performance.(3) The combination of Irganox245and DLTP showed much better stabilization effect than the individual components due to the strong synergistic effect. Only weak synergism could be observed in the combination of Irganox1076and DLTP. Irganox1076and Irgnox1076/DLTP exhibited similar behaviors between antioxidants with the highest and lowest efficiencies.(4) The particle size of the synthesized spherical polyelectrolyte brushes (PB-PAA brush) with PB as core was obviously larger than that of its core, and the particle size distribution of PB-PAA brush was narrow. The PB-PAA brush thickness could be controlled by adjusting the amount of acrylic acid (AA), and it varied regularly with pH and salt concentration in solution. Emulsion concentration, grafting density, polymer chain length and so on had obviously influence on the stability of PB-PAA brush. Catalysts of Ni, Co and Ag nanoparticles which prepared and loaded in spherical PB-PAA nano-reactors possessed relatively high catalytic activity, and their catalytic efficiency increased with the rise of capacity of metal nanoparticles and the temperature.