Double Vigour Chemical Rubber Accelerator Auperiority
Most of the synthetic rubber of the raw rubber is low strength, unfavorable to the bag roll, in the formulation to add a filler with high activity and high structural as well as chlorinated polyethylene rubber accelerator, improved bag roll. The bag roll, increasing the strength of the plastic material. Natural rubber, isoprene rubber carbon black was added, the mix of strength, package roll improved. Zinc oxide, barium sulfate, titanium dioxide, and other non-reinforcing filler is added, the gum base will reduce the strength of the mix, unfavorable to the bag roll. The rubber compound added talc, make a roll tendency intensifies.
As the temperature rises again, to enter the section Ⅳ area, in the region Ⅳ rubber was viscous while the package on the roll, and produce a large plastic flow, when conducive rubber material the rolling operation. Therefore, in the rubber mixing operation should be strict control of process conditions, select the appropriate roll temperature of the plastic material in the II zone processing, in the the Ⅳ area rubber calendering operation.
The molecular weight of the raw rubber, the molecular weight distribution, glass transition temperature, degree of branching, the gel content of the rubber bag roll resistance. With increasing molecular weight, molecular weight distribution is wide, the plastic material fracture elongation ratio increases, the temperature in the range of the first zone Ⅱ expand, the rubber bag roll performance improvement. The glass transition temperature of the rubber is appropriate rubber accelerator effects, better performance of the package of plastic material roll.
Region Ⅰ and Ⅱ area of natural rubber and styrene butadiene rubber mixing only in the normal operating temperature, there is no obvious area Ⅲ package roll better performance, better the role of rubber accelerator; butadiene rubber bag roll the main reason for the poor low glass transition temperature, low modulus, the strength of the raw rubber. With the degree of branching increases, the gel content increases, the elongation at break of the rubber ratio decreases, the strength of the raw rubber is reduced. Therefore, to reduce the gel content and the degree of branching, can improve the resistance of the plastic material bag roll.