Preparation method of integrated rubber

Abstract

The invention discloses a preparation method of integrated rubber. The method comprises the following steps: respectively adding isoprene, styrene, butadiene, cyclohexane and a structure modifier intoa first polymerization kettle, uniformly stirring, and heating to 40-70 DEG C; respectively adding isoprene, styrene, butadiene, cyclohexane and a structure regulator into a polymerization kettle, uniformly stirring, and heating to 40-70 DEG C; respectively adding a catalyst diluents of n-butyllithium into the first polymerization kettle and a second polymerization kettle, and respectively addingisopropanol into the first polymerization kettle and the second polymerization kettle to terminate the reaction after the reaction time is up; respectively obtaining a low-molecular-weight glue solution and a high-molecular-weight glue solution in the first polymerization kettle and the second polymerization kettle; transferring the glue solutions in the first polymerization kettle and the secondpolymerization kettle to a mixing kettle according to a mass ratio of 0.05-0.2:1, heating to 40 DEG C, and stirring for 20 min; and pouring the glue solution in the mixing kettle into absolute ethylalcohol, carrying out flocculation, and then drying to obtain the filling liquid glue type integrated rubber. The integrated rubber prepared by the method has relatively low Mooney viscosity.

Description

technical field [0001] The invention relates to the technical field of rubber preparation, in particular to an integrated rubber preparation method. Background technique [0002] Integrated rubber (SIBR) is a new type of rubber used for treads. Its notable feature is that the molecular chain is composed of segments of various structures. There are segments that are more flexible like butadiene rubber and have weaker flexibility. For example, the chain segment of styrene-butadiene rubber is similar, and the chain segment of different structure provides different properties of rubber. The flexible and strong chain segment can make the rubber have excellent low-temperature performance, and can also reduce rolling friction resistance and improve the wear resistance of the tire. The more rigid chain segment increases the wet grip of the rubber and improves the safety of the tire on wet roads. [0003] Since Nordsiek and others proposed the concept of integrated rubber, more than...

AI Technical Summary

Problems solved by technology

[0004] The integrated rubber obtained by the traditional anionic solution polymerization method is a rigid structure polymer with a single molecular weight, high molecular weight and narrow molecular weight distribution, which makes it have defects such as high Mooney viscosity and poor processability in actual industrial production.

There are also patents that use the oil-filling method to improve the processing performance of integrated rubber, but the introduction of small molecular oils into integrated rubber will have an adverse effect on rubber rolling resistance and mechanical properties. In addition, the filled oil is easy to precipitate during rubber vulcanization. , thus affecting the use of later vulcanized products, and also has adverse effects on the environment

There are also reports in the literature to prepare star-shaped integrated rubber through coupling reactions, thereby broadening the molecular weight distribution of the polymer and improving its processing performance, but the effect is not obvious

There are also patents that use emulsion polymerization to prepare integrated rubber. Although the emulsion polymerization system initiated by free radicals can achieve a wide molecular weight distribution, it has great limitations in the adjustment of rubber molecular weight and microstructure.

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