Compared to zinc oxide: Zinc carbonate has a low zinc content and it has a common effect with zinc oxide to activate accelerators to accelerate vulcanization. However, zinc carbonate is also characterized by a better transparency than zinc oxide and no whitening phenomenon. It is generally used in the manufacture of sulfur-vulcanized translucent rubber products. Another feature of using zinc carbonate is that the hardness increases significantly. The zinc oxide can not only accelerate the vulcanization speed, but also has a certain degree of whitening and reinforcing effect. In the color adjustment, zinc oxide is commonly used to improve the color, and it can improve the anti-aging properties of vulcanizates and the thermal conductivity of the products.
Zinc oxide preparation methods are divided into three categories: the direct method (also known as the United States law), indirect method (also known as the French method) and the wet chemical method. At present, many commercially available zinc oxides are mostly direct or indirect products, and the particle size is micron, and the specific surface area is small. These properties greatly restrict their application fields and their performance in products. However, nano-scale ultrafine activated zinc oxide prepared by the wet chemical method (NPP-method) can be used as a raw material for various zinc-containing materials, zinc leaching is performed by acid leaching, and impurities in the raw materials are removed by multiple purification, and then precipitated to obtain basic Zinc carbonate is finally baked to obtain nano zinc oxide.
Active zinc oxide features:
1. It has the characteristics of good rolling property and excellent dispersion, plus its small particle size, light and loose structure, large nitrogen adsorption surface area, and high conversion rate of zinc oxide to zinc sulfide. Therefore, as a vulcanization accelerator and a good reinforcing agent for synthetic rubber, it is 50-70% of the amount of ordinary zinc oxide.
2. It is used as a stabilizer for ultraviolet light in the rubber industry and can improve the atmospheric resistance of polyethylene.
3. The zinc resin prepared by reacting with resin acid can be used to produce fast-drying ink and has a good coloring effect.
4. The prepared zinc oxide desulfurizer has the characteristics of large specific surface area, high penetration sulfur capacity, high mechanical strength, large stacking gap, and low bed pressure drop. Widely used in ammonia, methanol and hydrogen and other industrial raw materials gas, oil deep desulfurization purification process. At a certain temperature and pressure, the concentration of trace hydrogen sulfide and organic sulfur in the gas can be effectively reduced.
Basic zinc carbonate:
It is mainly used as a catalyst, desulfurizer, and also as an active agent for natural rubber, styrene-butadiene rubber, butyl rubber, nitrile rubber, chloroprene rubber, EPDM, and rubber. It is widely used in the manufacture of transparent products.