The successful development of rubber blending modification technology is not only of great practical significance, but also of great theoretical significance. The theory of rubber blending came into being along with the practical process of blending. Although these theories are still in the process of continuous development and improvement, they have shown an important guiding role in production practice.

　　In summary, these theories are: ① polymer compatibility theory; ② structural morphology theory of rubber product blends; ③ co-crosslinking theory of component polymers in rubber blends; © rubber-plastic blend TPE theory.

　　Implementation methods of rubber product blending and progress of blending modification According to the state of rubber and synthetic resin during blending, there are the following three blending methods: melt blending, liquid blending and solution blending.

　　Melt blending is a method of mixing synthetic rubber or synthetic resin after heating it to a molten state. Melting and mixing are carried out in a rubber mixer or extruder, which is a commonly used method in industrial production. Liquid blending is a method of mixing polymers in an emulsion state, such as NBR/PVC blends.

　　In recent years, research on rubber modification by blending with low molecular weight compounds or oligomers has received more and more attention. These low molecular weight compounds or oligomers generally contain active reactive atoms or groups, which can undergo grafting, block copolymerization or crosslinking reactions with rubber macromolecules during the blending process or the vulcanization process of the blend, thereby modifying the rubber. This blending modification of rubber is called reactive ^^ mixing modification.

　　Blending rubber with low molecules or oligomers can not only improve the mechanical strength of rubber, but also improve other properties. For example, blending natural rubber with maleic anhydride produces a maleic anhydride graft copolymer of natural rubber and vulcanizes it. The tensile stress of the glue is increased by more than 10 times, the number of dynamic fatigue bending resistance is increased by nearly three orders of magnitude, and the heat aging resistance is also significantly improved. Another example is the blending of oligomeric acrylate and nitrile rubber. The former can undergo a cross-linking reaction with the latter in the presence of an initiator, which not only significantly improves the mechanical strength of nitrile vulcanized rubber, but also improves the bond between nitrile rubber and metal. Bond strength.

　　The translational blending modification of low molecular weight compounds or oligomers with rubber products is a supplement to the non-reactive modification technology. With the commercialization of many low molecular weight compounds and oligomers, the application prospect of this modification technology is very promising.