Rubber technology

The nitrosamine produced by the secondary amine accelerator may be carcinogenic, and may be replaced by a promoter of a primary amine structure and a benzylamine structure, such as NS instead of NOBS, such as the use of tetrabenzyldisulfide thiuram instead of TMTD in a green tire compound; Instead of PZ and EZ, zinc dibenzyldithiocarbamate was used. Rhein Chemie has developed a dithiophosphate-free accelerator that does not have nitrosamines and has a good effect in maintaining the environment.

Phenylnaphthylamine anti-aging agents are just around the corner due to toxicity. The performance of p-phenylenediamines is good, especially 4020, which is widely used. The development of anti-extraction, low-volatilization, low-diffusion and long-acting anti-aging agents is an important topic in rubber production research. It has two functional groups, p-phenylenediamine and triazine. It is resistant to static, dynamic oxygen and ozone aging. It is non-polluting. Better anti-aging agents Regarding non-polluting anti-ozone anti-aging agents, some people think that tocopherol APT and its complexes may be more reliable.

Since the performance of solution-polymerized styrene is better than that of emulsion polystyrene, it gradually penetrates into the tire industry, and it accounts for about 70% of styrene. The third-generation solution of styrene-butadiene benzene uses the concept of integrated rubber, and maximizes the performance through molecular design and chain structure optimization. It has become the focus of the development of synthetic rubber, and the processing property of BR made by rare earth lanthanide catalyst. Physical properties and wet skid resistance are superior to other catalytic systems, and butyl rubber has a star-branched type IIR and a star-branched halogenated IIR that have significantly improved processability. In terms of high performance of NBR, there are powdered nitrile and hydrogenated nitrile. Thermoplastic elastomers are growing at times that are comparable to those of conventional rubbers.

Application of nano materials in rubber reinforcement

Carbon black has been used as a reinforcing agent for 100 years. Although nanomaterials range in size from 1 to 100 nm, the reinforcing carbon black and the general white carbon black structure fall within this range, but then Not considered from a nano perspective. Since the 1990s, the rapid development of nanotechnology, the enhancement of polymers, including the reinforcement of rubber, has given new meaning, making this field a new development period. The size of traditional inorganic fillers (except white carbon black) is much larger than that of nanomaterials, and their hydrophilicity. Although it has achieved considerable effects in surface modification, the problem of agglomeration of fillers has not been fundamentally Solution.

Nanomaterials have a large specific surface area, and there are naturally many active sites on the surface. In addition, due to the special effect of particle size, nanomaterials and rubber can be more effective. In particular, research on in-situ generation of nanofillers and intercalation techniques can achieve both nanometer size and dispersion problems. This makes it possible to make revolutionary progress in rubber reinforcement.