Study On Structure And Properties Of New Domestic Sibr

The structure and properties of SIBR2505were studied using such analysis instruments as NMR, GPC, FTIR, DSC, etc in this paper. For the effect of SIBR formula system on the performance of SIBR, the dosage of zinc oxide and stearic acid, the types of carbon black, the influence of coupling agent on silica, carbon black/silica incorporation system and silica dispersant were studied. At the same time, the blending of SIBR with NR, BR, SSBR, and the effect of homogenizing agent on blending system were studied. The rubber vulcanization characteristics, Mooney performance, physical and mechanical properties, abrasion resistance, dynamic mechanical properties and SEM were studied synthetically.The results showed that, measured by GPC, the molecular weight distribution curve was bimodal, the first peak stood for coupling peak, and the second peak was the basic peak. The number-average molecular weight (Mn) was616275, the weight-average molecular weight (Mw) being672177, and distribution index (Mw/Mn) being1.091. The styrene content of rubber was about21-23%, for isoprene, the content of3,4-sturcture was higher than1,4-structure. There were three kinds structure of butadiene:1,2-structure, cis-1,4and trans-1,4-structure. The glass transition temperature of rubber was-37.53℃, which was tested by DSC. The Mooney viscosity of raw rubber was57.5.The inspection results of formula system showed that, with the increase of the dosage of zinc oxide, the performance of the rubber increased firstly, then almost the same, even decreased. When the dosage of the Si69was8%-10%of silica, the comprehensive performance of the rubber was the best. The study of various carbon black filled rubber showed that, BL series carbon black, of which the structure degree was high and the particle size was small, could make the curing time and scorching time increased, the crosslinking density of the vulcanizates became higher, Mooney viscosity increased, the slack area reduced, so that the processing became more difficult. Through the strain sweep, we found that the△G‘of BL201was the largest, the amount of the secondary structure was the most, and the Payne effect was the strongest. In the silica filled system, the use of silica dispersant could shorten the curing time, extend the scorch time and weaken the filler network. When added4portions of AT-BT dispersant, the relaxation area was the minimum, in another word, the processability was the best, which could be proved by Scanning electron microscopy photos and the results of RPA strain scanning.The effect of silica on the storage modulus was significantly in the carbon black/silica incorporation system. When silica was added firstly, the curing time of N220was longer than N330. When carbon black was added firstly, the impact disappeared. The Payne effect of N220was stronger than N330, and when silica was added firstly, the dispersion effect was much better. When the dosage of silica was10phr, the wet-skid resistance property was even better. With the increase of the dosage of silica, the rolling resistance and heat production reduced.For rubber blending system incorporated with homogenizing agent, the existence of homogenizing agent could reduce energy consumption, improve the processing performance and to a certain extent, improve the physical properties of the rubber. By adding dispersant, the dispersion of filler was much better, at the same time, the compatibility between the rubbers was improved.