Modern rubber processing technology has made great progress, but as a supporting industry, rubber processing industry will always encounter many new problems to be solved, and it will have to develop continuously. Modern development is mainly around high performance, functionalization, green, automation, energy saving and other aspects.
1. Rubber materials: since the implementation of the standard rubber program in Malaysia in 1965 and the scientific and advanced production of natural rubber, the problem to be solved is the protein allergy of natural rubber latex products. 2.5% of the patients showed allergies. Studies have shown that the allergy is caused by residual extractable protein in natural dairy products. China has also developed a low protein emulsion that meets the quality standards of the food and Drug Administration of the United States.
2. In the 1990s, metal catalytic technology was used in industry to synthesize elastomers with adjustable molecular weight distribution and regularity and better performance. Carbon black has been used as a reinforcing agent for 100 years. Although the size range of nano materials is 1-100nm, the reinforcing carbon black and the general white carbon black fall in this range, but that is not considered from the perspective of nanometer. Since the 1990s, the rapid development of nanotechnology, polymer reinforcement, including rubber reinforcement, has given new connotation, which makes rubber field enter a new development period. The specific surface area of nano materials is very large, and there are many active points on the surface. In addition, due to the special effect of particle size, the interaction between nano materials and rubber will be stronger! In particular, the research of in-situ nano materials and intercalation technology can not only obtain the size of nano scale, but also solve the problem of dispersion. The rubber reinforcement has made revolutionary progress.
Anti reversion agent and post vulcanizing agent are a new kind of auxiliaries in vulcanization system. The post vulcanizing agent not only has the function of anti reversion, but also can maintain good dynamic performance in the process of rubber use, such as hexamethylene-1
One of the important directions of the development of modern compounding agents is one agent with multiple functions. There are two ways to achieve this goal. One way is to synthesize functional groups with different functions into a compound, such as N, which has the functions of anti scorch, promotion and vulcanization, and can also improve the heat resistance. Another example is the homogeneous polyester (unsaturated polyester), which acts as a plasticizer in rubber mixing and vulcanizes to participate in the blending process In addition, it has obvious hardening effect on the products and tackifying effect. Another method is compounding, in which the complex with different functions is mixed together.
In terms of rubber technology and equipment, the progress of rubber processing technology has two aspects, one is the improvement of traditional process and equipment, the other is the development of non-traditional new concept technology. Rubber mixing, calendering, extrusion, molding and vulcanization are five basic processes. Modern equipment and tooling have made great progress. At present, the main mixing equipment is mixer. Due to the configuration of upper and lower auxiliary machines and microcomputer control, the automation level has reached a relatively high level.
Since the 1980s, cold feed extruder has become the mainstream. Screw is the main part of the extruder. Vacuum cold feed extruder is even better. It makes the semi-finished products have no pores and are dense.
In terms of vulcanization medium, nitrogen will be further popularized as a vulcanizing medium, and has been widely used in vulcanizing tires and cots in recent ten years. More than 60% of advanced radial tire in foreign countries use hydraulic curing press. In the mold curing press, there are vacuum plate curing press. High degree of automation of the introduction of the self mold plate curing press and between the ordinary plate curing press and injection molding vulcanizing machine transfer type plate curing machine.
