ABS PA-757F奇美--POLYLAC ABSPA-757F 食品接触应用，熔融指数1.6，洛氏硬度116R,弯曲强度80.4，缺口冲击强度210，耐温95℃，防火等级UL-94=HB
ABS Polymerization Reactor Development:
Although the agitator of Mitsui Dongya Chemical Company'scontinuous bulk polymerization kettle has helical blades andmicro-mixing auxiliary blades at its lower part, the mixing effectcan not meet the re, especially when the conversion rateof polymerization is high and the concentration of polymer is high,the mixing effect is not good, the heat transfer coefficient is nothigh, and the scaling of the ventilation tube of the originalpolymerization kettle device is made, and the difficulty iseliminated. Hard. For this reason, a screw-belt tube agitatorsuitable for continuous bulk polymerization reactor was designed.It can greatly increase the heat transfer area. With the dualfunctions of heat transfer and stirring, the dead angle of stirringcan be eliminated and the stirring range is large, which ensuresthe smooth progress of continuous bulk polymerization. After yearsof continuous improvement and improvement, the bulk ABS productionprocess has made great progress in product performance and processroute diversification. With the expansion of the application of ABSresin, the bulk ABS production process will also become ABSproduction process. Emphasis of industry research.
ABS changes the type of initiator:
ABS uses double functional group initiator instead of singlefunctional group initiator. Without changing the weight averagemolecular weight of resin, the number average molecular weight isreduced and the average molecular weight is increased. Thus theextrusion and injection products have a good surface gloss, but thetoughness and heat resistance are not reduced. Introduce the fourthmonomer: Monsanto Company of USA improves the gloss, tensile,impact resistance and processability of ABS by adding trans-butyricacid dibutyl ester into the continuous bulk process formulation.The notched impact strength, tensile strength and glossiness of thefinal product are 140.6J/m, 41.94 MPa and 69.3% respectively. DowChemical Company grafted acrylonitrile, polybutadiene rubber andstyrene at a mass ratio of 19.6:30.0:50.4 to obtain the graftcopolymer, acrylonitrile and methyl methacrylate at a mass ratio of8:92 to obtain the copolymer with a mass ratio of 55:45 and thencontinued to react to obtain the product. The transmittance of theproduct reaches 88%, and the notched impact strength of thecantilever beam reaches 190J/m. GE company grafted SAN ontostyrene-butadiene rubber to form a graft phase. Free SAN andpolymethylmethacrylate (PMMA) formed SAN/PMMA disperse phase, andfinally obtained transparent ABS resin with excellent performanceand high added value.
The effect of ABS rubber grafting:
ABS styrene and acrylonitrile monomers are grafted onto rubberto form grafted rubber. It produces rigid SAN copolymer branchedchain on flexible rubber main chain, which makes the dispersedrubber phase and continuous SAN phase have better compatibility, sothat ABS resin has better rigidity and toughness. Therefore, thephysical and chemical properties of the grafted rubber aredetermined by the grafting density and amount of monomers on therubber and the length of the grafted chain, which affects thecompatibility of the dispersed phase and the continuous phase inthe product and the final properties of the product. The degree ofgrafting depends on the properties of initiator and modifier andthe different solubility of styrene and acrylonitrile in rubber andmatrix phase. This difference in solubility reduces the degree ofgrafting and leads to the difference in acrylonitrile contentbetween the grafted rubber and the matrix resin.
