| Acrylonitrile-butadiene-styrene terpolymer(ABS)is a very widely used thermoplastic resin.Due to the special terpolymer structure of ABS,ABS products can be seen everywhere in life.Such as household appliances shell,car surface panels,tubes,sporting goods and so on.This shows that the application of ABS is wide used.Of course,there are shortcomings,due to the presence of polybutadiene rubber phase in the ABS resin,and polybutadiene in the presence of unsaturated double bonds,making the product easy to heat,light and external stress.it caused mechanical properties of a significant decline in resistance aging performance.This paper will be two parts of the work for these two aspects of research and discussion,making the product better performance,heat more stable.In the first part,ABS resin was prepared by melt blending method and SAN resin by changing the polymerization ratio of polybutadiene and comonomer by emulsion polymerization.The ABS resin was prepared by melt blending and SAN resin.The structure and properties of ABS resin were characterized by scanning electron microscopy(SEM)and dynamic mechanical viscoelasticity spectroscopy(DMA).The results show that the impact strength of the blends increase first and then decrease with the increase of the core-shell ratio of the graft copolymer,and the tensile strength is not obvious.The results show that the magnitude of the internal friction(tan?)max of the rubber phase depends on the core-shell ratio of the graft copolymer,and the grafting degree of the SAN copolymer on the PB rubber particles are in the proper range,the internal friction value of the rubber phase and grafting too high or too low are related.The results show that the blends prepared by the graft copolymer with the core-shell ratio of 70/30 have high ductile fracture characteristics,which is consistent with the results of the mechanical tests.In the course of the experiment,it was found that the appearance color of the ABS resin was dark,and the thermal oxygen protection effect of the antioxidant in the synthetic process of the ABS resin was not ideal,so the second part of the experiment was carried out.The second part is to study the anti-aging properties of ABS resin,mainly to study the emulsion of emulsion emulsion added to the emulsion.Through the use of oleic acid and potassium hydroxide reaction between the formation of potassium oleate as an emulsifier preparation complex antioxidant emulsion.The ABS graft powder with complex antioxidant was tested by differential scanning calorimetry(DSC).The optimum conditions for the addition of antioxidant to the ABS emulsion were determined by stirring time,stirring rate,stirring temperature and antioxidant concentration.Under the optimum conditions,the main antioxidant R-245 was used as the auxiliary antioxidant DLTP and the auxiliary antioxidant PS802.The ratio of the main antioxidant to the auxiliary antioxidant and the amount of the addition to the ABS emulsion were studied.The obtained powder was tested with DSC to obtain the optimum experimental formula.The experimental results show that the synergistic effect of the main antioxidant R-245 and the auxiliary antioxidant PS802 is much better than that of the auxiliary antioxidant DLTP.The oxidation induced temperature is about 20 higher than that of the ?commercial antioxidant,and the oxidation induction time is increased by 5 times.Can play a long-term thermal stability,to prevent the resin too fast aging,improved ABS resin appearance color dark phenomenon. |
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