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Is the effect of zinc oxide on the properties of high temperature resistant silicone tube?
First of all, zinc oxide is a metal oxide, has a good thermal conductivity, high temperature resistant silicone tube in the system will be used in. So, in the production of sulfide will not affect its performance?
Second, the chemical principle of zinc oxide in the curing system.
Resistant high temperature silicon rubber vulcanization process often cracking, sulfur bond cleavage to generate hydrogen sulfide groups, and ZnO and the role, the fracture of the crosslinks to cross into Xinjian. If there is a small amount of H2S generated during the curing process (especially in the high temperature, it is more likely to produce), the H2S can decompose the sulfur bonds, and zinc oxide can prevent this reaction. In addition, zinc oxide can promote the decomposition of sulfur bonds, so that the sulfur atom number of sulfur bonds is reduced, and finally to generate a sulfur bond and two disulfide bonds.
From this it appears that the oxidation of zinc is the role of the multi - sulfur bond shorter, making it more resistant to heat, and to increase the crosslinking density. Zinc oxide and promoter MBT, MBTS, TMTD and other zinc salts, such as Zn (MBT) 2, ZDMC and other anti aging effects, in particular, the anti aging effect of ZDMC. In addition to the active agent, zinc oxide also has a reinforcing, coloring and increasing the thermal conductivity of rubber material. If the dosage of active agents to further increase the amount of zinc oxide (about 10 phr or more), it will produce the following effects:
1 in general, the reinforcing effect can be improved, which is a great influence on the elastic and dynamic properties of the vulcanized rubber.
2 then it is obvious that the increase of the adhesive material to the fine particles of zinc oxide is particularly significant, which can be used to improve the stability of the shape of high temperature resistant silicone tube.
3 in the final step is to further improve the thermal conductivity of rubber material, which is very beneficial to the hot air curing and curing of thick products.
This paper comes from Shenzhen,.
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