Rubber vulcanization system is mainly composed of what additives, and its respective role is what
Advantages are low compression set, good heat and cold resistance, rubber vulcanization time is short, do not pollute the metal, easy to produce transparent rubber. The disadvantage is generally not used for hot air vulcanization, tearing performance is poor.
Commonly used zinc oxide, magnesium oxide, calcium oxide, calcium hydroxide and so on. Zinc oxide is easy to scorch, plus SA can be slightly slow and scorch tendencies. Magnesium oxide and calcium oxide scorch tend to be smaller and the best for calcium hydroxide. Magnesium oxide dosage to slightly more appropriate, increase the amount of rubber can increase the rate of curing, and improve the strength and hardness of vulcanized rubber. Disadvantages are heat, poor flex resistance. Third, the peroxide vulcanization system
The advantage is that the vulcanized rubber hardness and tensile strength is high, and with epoxy resin, can improve the heat resistance and dynamic properties of vulcanized rubber
(1) Conventional vulcanization system: from sulfur and a small amount of accelerator and other complex agent composition, mainly to poly-sulfur bond. High temperature performance, compression and permanent deformation, after the sulfur is easy to return to the original phenomenon, but the flexion fatigue line is better, higher mechanical strength, rubber and products are not easy to spray cream. (2) effective, semi-effective vulcanization system: sulfur dosage is generally 0.5 copies or less, the usual amount of 0.35 copies, with a large number of accelerators, requires a longer scorch time (speeding accelerator and post-effect and use), activity A sufficient amount of stearic acid (1-8 parts) should be used. Almost no vulcanization of the original phenomenon, good curing vulcanization, heat resistance, low compression deformation, heat small. Disadvantages of resistance to flex fatigue is poor, prone to frosting phenomenon. The use of high TMTD effective vulcanization system formula, although widely used, but the processing stability is poor, cutting cream serious. Second, the metal oxide curing system
