| Skim rubber latex is produced after the skim through the centrifuge by sulfuric acid coagulation, table-ting, and the product obtained after drying. The rubber hydrocarbon content is low, non-rubber component content is high, the variation is big and the color is dark brown. The color of natural rubber (NR) is one of the important indicators of the quality of products, it directly affects the people on the visual and psychological perception of the product, also affect its application in some areas. Therefore, it is necessary to the appearance of low value by-product skim rubber can be improved to improve the added value of natural rubber in the manufacturing process, to further broaden the application field of skim rubber. In this paper, the preparation process is improved, select suitable for soaking liquid skim rubber chemical immersion, to improve the appearance and mechanical properties of skim rubber. At the same time, the preparation of silica/skim rubber composites, and the difference meter, density meter, electronic tensile testing machine, RPA GC-MS, TG, DMA, DSC, atomic absorption spectrometer and the indexes of rubber and composites of rubber, structure and performance are analyzed.The skim rubber’s processing branch of the four processing factories of Hainan Rubber Group were analyzed. The results show that there are some differences between the performance of several kinds of skim rubber, the rubber processing branch 4 and the mechanical properties of rubber and aging resistant performance is poor. In order to further improve the performance of 4 skim rubber, of oxalic acid, phosphoric acid, sodium bicarbonate, sodium hydroxide solution influences the varieties and dosage on the skim rubber color and performance. The study found that soaking liquid can improve the skim rubber smell to a certain extent. Among them, sodium hydroxide on the skim rubber color effect is best, but after treatment with sodium hydroxide the mechanical properties of skin rubber decreased slightly, while oxalic acid processing skim plastic rubber and plastic PO initial retention rate increased significantly, the mechanical properties and aging resistance performance has been greatly improved, and the grass acid treated skim Rubber thermal stability is better, in general, in the amount of range, oxalic acid concentration was 2-3%, the skim rubber appearance and performance improvement effect is remarkable. Different soaking liquid on the glass transition temperature of skim rubber (Tg) has little effect on TGA analysis showed that the thermal stability of rubber fluctuate.The results show that when the silica was added, the curing time of T90 blends was greatly extended, and with the increase of silica content, the cross-link density decreases gradually, when adding 10phr, the tensile strength increased slightly; silica added composite Tg had small changes, effectively improve the thermal stability of composite rolling resistance and wet skid performance to improve, but the Mc did not affect when the amount exceeds 30phr, to reduce rolling resistance adverse. Modification agent was added to mixed rubber vulcanization process, composite hardness decreased and the tensile strength and resistance to aging properties were improved, and the glass transition temperature (TG) changed little, composite materials stock exchange between the average molecular weight fluctuations, which add PY modified agent colloid of MC and swelling degree minimum, cross-linking density maximum. Modified agent can effectively improve the silica gel rubber composite thermal stability performance of showed that the modified agent is added to improve the composite rolling resistance and anti-slippery performance. |
