Integrated rubber (SIBR) is the fourthgeneration of SSBR and new tire tread with great market potential, prepared by butadiene,styrene and isoprene as monomers and organic lithium compound as catalyst.
At present, only the United StatesGoodyear tire and rubber company industrializes SIBR,named as Cyber, grade Siberflex2550.The capacity is 50kt and the products areall occupied, mainly used for high performance car tire production. Nordsiekproposed the concept of integrated rubber first, namely introducing thesegments of NR, BR and SBR to the same polymer chain. Thereby the rubberobtains all these advantages so that the situation of phase separation will beimproved while NR, BR and SBR blend. Yanshan branch of BRICI developed SIBR industrial technology with complete independent intellectualproperty. This technology uses a new regulatorsystem, which is dissolved in non-polar solvents easily, less dosage,completely removal from the solvent and efficient control of the content ofstyrene micro block and lateral side group. Yanshan branch of BRICI developedtwo industrial grades, namely SIBR2535 and SIBR2505, and completed the PDP of30 kt SIBR plant.
SIBR for with low rollingresistance and high performance tire
SIBR2505is a grade of medium vinyl structure, used as a variety of rubber products,especially suitable for tire tread rubber. The specific sequence structuremakes the products high wet skid resistance and good brake safety of cars,obtained by a new polar structure regulator regulating the rate of styrene,butadiene and isoprene. Step by stepfeeding process can improve the content of styrene micro block, and generatediblock polymers. The flexible segment can reduce the rolling resistance ofrubber and give tires fuel economy.
Comparedwith the domestic products, the rolling resistance is reduced 11.8%, wetpavement braking distance is shortened by 10.7% while dry braking performanceis not reduced. It is conducive to the improvement of the wet pavement brakingsafety and energy saving.
SIBR for wet skidresistant high performance tire
SIBR2535 is agrade of middle vinyl structure and oil filled in 25, used as a variety ofrubber products, especially suitable for tire tread rubber. SIBR2535 has starrandom structure by coupling technology. Blended with other rubbers, SIBR2535can effectively improve the compatibility.
SIBR2535 grade has completedindustrial trial production in Yanshan branch of BRICI, and been applied for225/50ZR17 98W enhanced high performance tire in domestic tire factory. Thetire passed all the tests of manufacturers and the national safety standardstesting center. The test results show that, compared with the samespecifications tire, SIBR2535 tire has the same rolling resistance while drybraking distance is shortened 5%, and wet pavement braking distance isshortened by 13.9%. It is conducive to the improvement of safety brakingperformance in the wet road.