Study Of CM Elastomer Modified By Organic Silane And Its Crosslinking In Water Bath

Silane crosslinking is a new method for crosslinking polyolefins. The method is based on the hydrolysis condensation reaction of silane compounds, which has the advantages of low investment in equipment, low vulcanization temperature, good aging resistance of crosslinking products and long service life. At present, the silane crosslinking method has been applied in the cross-linking modification of polyolefin such as polyethylene, polyvinyl chloride and so on, showing good modification effect and application prospect. In order to make this comprehensive and comprehensive cross-linking method applied to CM materials, to carry out silane modification and its cross-linked CM research, for the rich CM modification and crosslinking, expansion of silane cross-linking theory and practice are of great significance The The main contents of this paper are:1. Study on the water bath cross-linking of KH550 modified CM elastomers. Based on the different water environment and DBTDL existence method, the kinetic characteristics of CM crosslinking under different conditions were analyzed,and FTIR and TMA were characterized by different samples. The results show that the silane modification - water bath method is an effective way for CM crosslinking. DBTDL concentration, water content in external environment and water bath condition have significant influence on the crosslinking of modified CM. Among them, the modified CM matrix containing DBTDL samples with the highest cross-linking efficiency; with the increase in the temperature of the bath, modified CM hydrolysis faster cross-linking.When the water bath temperature is set at 90 ?, the water bath time 3h can make the cross-linking reaction is completed, then the cross-linked CM gel content of the maximum 70%. Compared with uncrosslinked CM, the thermal stability and tensile properties of crosslinked CM were improved greatly. The calculated activation energy of modified CM was 10KJ / mol , Indicating that the crosslinking reaction can be carried out under mild conditions.2.The crosslinking conditions, mechanical properties and thermal properties of the rubber were studied by using VTEOS modified CM as the research object. The results showed that the gel content and apparent crosslink density increased with the increase of the boiling time in the 90 ? water bath, and reached the maximum at 12h. TG results show that the initial decomposition temperature of the modified CM and VTEOS is increased from 244 ? to 276 ?, and the heat resistance is improved obviously. At the same time, the effects of the distribution of each group on the cross-linking of CM were investigated. The results showed that when the content of DBTDL was 0.13phr at 7phr,the mechanical properties of Vulcanized rubber were the best when the content of MgO was 4phr.3. The effect of different grafting processes (two-roll mill, mixer and twin-screw extruder) on the performance of VTEOS cross-linked CM was studied in this chapter.According to the FT-IR spectrum, we know that the three grafting processes allow VTEOS to be grafted onto the CM molecular chain. TG results show that the thermal stability of the VTEOS cross-linked CM obtained by the three grafting processes is improved with respect to the CM, and the VTEOS cross-linked CM obtained by the chemical grafting of the two-roll mill is the best. Mechanical properties, gel content,hardness and other data show that the three grafting process VTEOS-g-CM cross-linked by water bath, the tensile strength of cross-linked CM samples increased, breaking elongation decreased; The resulting three-dimensional structure allows the gel portion of the crosslinked CM to be insoluble in THF and also increase the hardness of the crosslinked CM.