NIUMAG
SBR is also known as polystyrene butadiene copolymer. Its physical mechanism performance, processing performance and product performance are close to natural rubber. Some properties such as wear resistance, heat resistance, aging resistance and vulcanization speed are better than natural rubber. It can be used in combination with natural rubber and various synthetic rubbers. It is used in the production of tires, tapes, hoses, wires and cables, medical equipment and various rubber products.
According to the polymerization process, styrene-butadiene rubber is divided into emulsion styrene-butadiene rubber (ESBR) and solution styrene-butadiene rubber (SSBR). Compared with the solution-polymerized styrene-butadiene rubber process, the emulsion-polymerized styrene-butadiene rubber process is more advantageous in terms of cost saving. About 75% of the production capacity of the global styrene-butadiene rubber plant is based on the emulsion-polymerized styrene-butadiene rubber process. Emulsion polystyrene-butadiene rubber has good comprehensive properties, mature technology and wide application. Its production capacity, output and consumption all occupy a place in styrene-butadiene rubber. Oil-extended styrene-butadiene rubber has the advantages of good processing performance, low heat generation, good low temperature flexibility, etc. It has excellent traction performance and wear resistance when used in tread rubber. Can reduce costs and increase production. At present, oil-filled styrene-butadiene rubber accounts for about 50-60% of the total output of styrene-butadiene rubber.
SBR is a general-purpose rubber with the largest consumption and is widely used. It can be used in general occasions except for special situations such as oil resistance, heat resistance, and special medium resistance. Mainly used in tire industry, and also used for covering rubber of conveyor belt, water hose, rubber shoe outsole, rubber roller, waterproof rubber products, tape products, microporous sponge products, shockproof products, etc.
Rubber content test, principle of low-field NMR method
The NMR signal of the matrix decays very quickly, generally decaying to zero within ten micrometers. The NMR signal decay of rubber packing is much slower, usually the signal can last for tens or hundreds of milliseconds. Therefore, by properly sampling the NMR signal, it is possible to obtain only the NMR signal of the rubber for quantitative measurements, as shown in the Free Induction Decay (FID) signal detected after a 90-degree pulse. In the test, according to the determined standard curve, determine the relationship between NMR signal intensity and rubber content, the rubber content can be measured within 30-2 minutes.
