Key SR Industrialization Technology Made Staged Achievements in China

21 February 2019 | Source from China Rubber Journal

Lately, the journalist learned from CNPC Petrochemical Institute that key SR industrialization technology, a key national R&D project led and undertaken by this institute had made staged achievements to realize significant technological breakthrough in core technological fields such as BSBBR/BIIR synthesis and double B tire manufacturing technology. These “heavyweight” technologies improved the overall level of China’s tire industry.

This project was led by CNPC Petrochemical Institute and jointly undertaken by 7 domestic scientific research institutions as well as colleges and universities such as Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Dalian University of Technology, Tsinghua University, Shandong Jinyu Industrial, Rubber Valley and Zhejiang Cenway.

BSBBR/BIIR is a rubber variety urgently required during high-end process of China’s tire industry to improve the service life of curing bladder and thin the inner liner. BSBBR is a high-end product of butyl rubber, whose production has large technological difficulty and requires harsh condition and a polymerization temperature of nearly -100℃, and there are always no mature technologies and products at home. The project team tackles key problems in three aspects, polymerization materials, polymerization process and polymerization formula, to break through slurry process butyl rubber polymerization technology, adopts anion polymerization technology and theory, prepares series branching agent with the function of slurry stability for cation butyl rubber polymerization technology and develops a whole set of slurry process BSBBR preparation technology.

The scientific research personnel took the lead to discover the law of dynamics and regulation mechanism of bromination reaction of butyl rubber in China and develop new reaction process of controlling bromine replacement position and improving bromine utilization rate to increase the bromine selection of BIIR from 84.2% to 97%.

Curing bladder is a core part in tire manufacturing and building and has an important influence on tire quality and cost. At present, the number of repeated use of domestic products is about 450, which still has a large gap with overseas advanced level and causes that the tires manufactured in China are worse than the overseas advanced double B tires by 2~3 grades.

Aiming at the structure features of BSBBR products, the project team innovated the processing theory to develop the high temperature-resistant and deflection-resistant curing bladder formula of BSBBR to improve its average service life by over 15% to reach 527 times. As for the “magic triangle” problem that the rolling resistance, slip resistance property and wear-resisting property can not be improved simultaneously, the project team developed the formula balancing and regulation technology of rolling resistance and slip resistance property of the tread rubber by establishing the correlation between the microstructure of the rubber and the filler and the rolling resistance, slip resistance property and dry and wet land regulation property of the tread rubber, and both the rolling resistance and slip resistance property of the prepared tires of 225/55ZR16 specification reached the requirement of level B.   

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