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The low cohesive strength of maleic rubber, adhesive self-adhesion is weak, in the mixing process, the raw rubber is broken, with poor dispersion of the agent, prone to de-roller. It is not easy to press the smooth butyl rubber into pieces in the opening machine, and it is easy to take off the roller, so it is better to use small roller torque, low roller temperature (40~50C) mixing. In order to make the mating agent evenly dispersed, the need for additional processing, mixing with the refiner, the capacity can be increased by 10%, the mixing temperature can be slightly higher, in order to facilitate the dispersion of the mating agent, the discharge temperature is generally in the 130~140 ℃, the use of two mixing is conducive to the dispersion of the uniformity of the mixing can be used in reverse mixing method. This can save 40% of the refining time. Carbon black content or the use of high structure of fine particles of carbon black, must be used in two-stage mixing in order to disperse uniformly, can also be used inverse mixing method mixing.
The process performance of cis-butadiene rubber is very different from other synthetic rubbers, basically no force chemical degradation and thermal oxidative degradation within the general processing temperature range (50~140C), when mixed with carbon black will form a hard structure, raw rubber and rubber cohesion strength is low, adhesion and self-adhesion is weak, in the mixing process, raw rubber is broken, with poor dispersion of the agent is prone to de-rolling, so it is generally required to be combined with natural rubber and SBR. Natural rubber and styrene-butadiene rubber and so on. Different varieties of cis-butadiene rubber, mixing characteristics are different, high cis-type type of mixing characteristics are better, including better roll covering and dispersion, open the roll temperature should be lower than the natural rubber to 40 ~ 50 ℃ is more desirable. The medium cis type requires a lower temperature. Low-cis cis-butadiene rubber can not be crystallised, so the processing performance is better. The amount of sulphur in cis-butadiene rubber is lower than that of other diene rubber. This is because the migration of sulfur in the smooth butyl rubber is faster, easy to produce frost phenomenon. The two-stage mixing method should be used as the main method. The use of two-stage mixing, can significantly improve the rubber process performance and the physical and mechanical properties of vulcanised rubber. Using a section of mixing, the plasticity of the conveyor belt covering rubber is 0.33; using two mixing for 0.38, when the plasticity of 0.2 ~ 0.25 will produce the phenomenon of off-roll. The tensile strength of vulcanised rubber is also improved for the rubber prepared by two-stage method. The softener should be added after the carbon black is dispersed, which can improve the tensile strength and constant tensile stress of the vulcanised rubber. Mixing of cis-butadiene rubber with styrene-butadiene rubber in the refiner and then adding other compounding agents does not significantly improve the properties of the rubber and vulcanised rubber. If the raw rubber and carbon black are blended at the same time, and then add softener, it can improve the tensile stress and tensile strength.
The process performance of cis-butadiene rubber is very different from other synthetic rubbers, basically no force chemical degradation and thermal oxidative degradation within the general processing temperature range (50~140C), when mixed with carbon black will form a hard structure, raw rubber and rubber cohesion strength is low, adhesion and self-adhesion is weak, in the mixing process, raw rubber is broken, with poor dispersion of the agent is prone to de-rolling, so it is generally required to be combined with natural rubber and SBR. Natural rubber and styrene-butadiene rubber and so on. Different varieties of cis-butadiene rubber, mixing characteristics are different, high cis-type type of mixing characteristics are better, including better roll covering and dispersion, open the roll temperature should be lower than the natural rubber to 40 ~ 50 ℃ is more desirable. The medium cis type requires a lower temperature. Low-cis cis-butadiene rubber can not be crystallised, so the processing performance is better. The amount of sulphur in cis-butadiene rubber is lower than that of other diene rubber. This is because the migration of sulfur in the smooth butyl rubber is faster, easy to produce frost phenomenon. The two-stage mixing method should be used as the main method. The use of two-stage mixing, can significantly improve the rubber process performance and the physical and mechanical properties of vulcanised rubber. Using a section of mixing, the plasticity of the conveyor belt covering rubber is 0.33; using two mixing for 0.38, when the plasticity of 0.2 ~ 0.25 will produce the phenomenon of off-roll. The tensile strength of vulcanised rubber is also improved for the rubber prepared by two-stage method. The softener should be added after the carbon black is dispersed, which can improve the tensile strength and constant tensile stress of the vulcanised rubber. Mixing of cis-butadiene rubber with styrene-butadiene rubber in the refiner and then adding other compounding agents does not significantly improve the properties of the rubber and vulcanised rubber. If the raw rubber and carbon black are blended at the same time, and then add softener, it can improve the tensile stress and tensile strength.
