Study On Hydrated Calcium Silicate Super-fine Powder Enhancing Strength Of The Rubber Composite

With the development and the increasing needs of rubber industry, especially the applied field of tint rubber is extended, the needs for inorganic enhanced filler are rising markedly. Because of the cost of traditional filler carbon black and white carbon black is so high and the common inorganic filler can not meet the required intensity as well as the serious pollution resulted from both of them, to develop a new inorganic filler has been considered as the most important issue in the related fiends. In this paper, in order to develop a cheaper tint rubber filler that will replace carbon black to composite with caoutchouc by surface-modifying of hydrated calcium silicate super -fine powder ,experiments were carried out on the basis of hydrated calcium silicate super -fine powder studied by professor Peng. The following aspects were focused on in this paper:1 Influence on surface modifying of hydrated calcium silicate powder with different equipments.2 Influence on surface modifying of hydrated calcium silicate powder with different kinds of modifier and different types of modifier.3 Influence on surface modifying of hydrated calcium silicate powder with different dosage of modifier.4 Effects of surface modifying were pre-evaluated by testing activation coefficient and oil absorb coefficient, and the a feasibility were carried out simultaneously.5 Technics of hydrated calcium silicate powder composited with caoutchouc as well as the factors that influence NR property were discussed.6 The diffusibility and grain distribution in the colloid of hydrated calcium silicate powder before and after modifying were studied by micro-test. As demonstrated in the experiment, the tensile and tearing strength of the final composite are congruent with that of rubber filled with carbon black (N220), and the final elongation percentage increased evidently after the rubber was ruptured when vulcanized at10MPa and 160℃×r3min and filler was added by 40 percent(based on polymer). Observing by STM and SEM we found that the hydration silicate powder, mass of which was uniformly dispersed in rubber.The result is that under the condition of hydrothermal synthesis with low pressure and temperature, the white amorphous super-fine hydration silicate powder can be made. After modified by agent 501(1%), powder as filler can be used for rubber and preferable performance of the final composite can be gained, and the enhancing effect accorded with that of carbon black (N220) under the laboratory condition.