Research And Application Of Central Split Mixing Process

This subject studies the process equipment layout and process design of the central split one-step mixing process.The central split one-step mixing process is quite different from the traditional multi-step mixing process.Compared with the traditional multi-stage mixing process,the central split one-step mixing process mainly adds and mixes the reinforcing and filling materials such as carbon black and white carbon black in the internal mixer,Then put the carbon black or white carbon black master rubber into the primary open mixer for cooling and supplementary mixing.After the temperature is reduced,put the master rubber into the secondary open mixer,add vulcanizing agent,accelerator and other processing aids for mixing.This mixing process effectively separates mixing and dispersion,and fully mixes carbon black,white carbon black and other reinforcement filling materials with rubber by internal mixer,which effectively solves the flying of reinforcement filling materials and reduces the pollution to the environment;At the same time,the high-speed open mixer is used to disperse the processing aids in the rubber,which can effectively solve the "deterioration" of the processing aids at high temperature,and finally affect the performance of the compound and even the vulcanizate.According to the idea of "mixing" and "refining" separation,relying on 800 million Rubber Co.,Ltd.,the first set of "central split one-step mixing production line" in China has been built.The test shows that the dispersion grade of carbon black produced by the "central split one-step mixing production line" is higher than that of the traditional multi-stage method,and the "Payne effect" is significantly weakened,indicating that "Central split one-step mixing process" is more conducive to filler dispersion than the traditional method;the tensile strength and 300% constant elongation of the corresponding vulcanizate are better than the traditional method,and the elongation at break is equivalent to the traditional method."Central split one-step mixing process" The prepared compound was vulcanized and aged.The test showed that the elongation at break,DIN wear,Akron wear and compression heat generation before and after aging reached the enterprise internal control standard.All in all,the compound prepared by the "central split one-step mixing production process" can meet the performance requirements of various parts of the tire and meet the internal control standard of the enterprise.Compared with the existing traditional method,the dispersion of filler has been improved,and the physical and mechanical properties of vulcanizate have been improved,except that the annual elongation at break is equivalent to that of the traditional method,the tensile strength and 300% constant elongation have been improved.