INFLUENCE OF STYRENE CONTENT ON SBR HARDNING (IN THE PRESENCE OF HEAT AND UV)

Abstract

Rubber is a group of industrial material like metelas, fibres, wood,plastic, glass etc. On which the world of modern technology depends. The world consumption of rubber is in the order of about 16 million tons per annum and has been increasing in the resent years at the rate of about 4% per annum. Out of this about 1/3 is man made synthetic rubber mainly produced from petroleum fractions. Total rubber consumption is of India in 1990 were approximately 460,000 tons and the ratio of NR: SR consumption is about 70:30.The resilience and elasticity are factors the distinguish different types of rubbers. Many of its modern applications rubber is not used alone but reinforced with textiles, metals etc. contributions of rubber in the field of engineering, space research, medical Sciences, family planning etc is vital. According to my research, my raw materials are Styrene butadiene rubber (SBR), Poly butadiene (BR), & High styrene resin (piolite/HSR). HSR is a powder form rubber. In order to prepare rubber blends I have mixed 2 raw materials among them. Then above samples divided in to 2 series. I have exposed to sunlight & heat treatment. Then I was determined the Mooney viscosity of samples according to the number of days 0, 3, 7, 10, 14, 21, 30‘...etc.SBR, BR and HSR are synthetic rubbers that are been used in tire industry. They are used at various composition mixtures. This work involves study of viscosity properties of several blends of rubber that was prepared by mixing SBR and HSR at different proportions with BR. The viscosity properties of the blend was determined using Moony visco meter and in the presence of heat and UV radiation.SBR, BR blends showed sensitivity towards heat and HSR: BR blends showed sensitivity towards UV radiation.