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Differences and characteristics of zinc oxide and basic zinc carbonate
Differences and characteristics of zinc oxide and alkaline zinc carbonate
Compared to zinc oxide, zinc carbonate contains less zinc and shares with zinc oxide the role of activation promoter and accelerated vulcanisation rate. However, another characteristic of zinc carbonate is that it is more transparent than zinc oxide, without whitening, and is generally used in the manufacture of vulcanised sulphur translucent rubber products. Another feature of using zinc carbonate is the significant increase in hardness. Moreover, zinc oxide not only accelerates the rate of vulcanisation, but also has a certain whitening and reinforcing effect, and is commonly used in the colouring of mixed zinc oxide, and it improves the ageing resistance of vulcanised rubber, as well as the thermal conductivity of the product.
Zinc oxide is the electronic structure of a semiconductor catalyst. When a photon with a certain energy or a photon with an energy greater than the band gap Eg of the semiconductor is shot into the semiconductor under the irradiation of light, an electron is excited from the valence band NB to the conduction band CB, leaving behind a hole. The energy and heat that can be input to the excited state of the conduction band electron and valence band hole makes the electron a state electron trapped on the surface of the substance. The valence electron twists the hydroxyl electron in the environment around the conduction band and valence band hole to produce hydroxyl radicals that act as strong oxidants and completely degrade organic matter (or chlorine) will kill bacteria and viruses. Activated zinc oxide is a white spherical powder with a density of 5.47 g/cm3 and a melting point of 1800°C. It is insoluble in acids, alkalis, ammonium chloride and ammonia.
Introduction to Basic Zinc Carbonate:
Physical and chemical properties white fine amorphous powder. Odourless and tasteless. Relative density 4.42 ~ 4.45. Insoluble in water and alcohol. Slightly soluble in ammonia. Soluble in dilute acids and sodium hydroxide. It reacts with 30% hydrogen peroxide, releasing carbon dioxide to form hydrogen peroxide. Zinc oxide is prepared by three main types of methods:direct (also known as the American method), indirect (also known as the French method) and wet chemical methods. Currently, many commercial zinc oxide products are mainly direct or indirect process products with micron-sized particles and small specific surface areas, characteristics that limit their application areas and performance in products.
Properties of zinc oxide and basic zinc carbonate
(a) Properties of activated zinc oxide
1. It has the characteristics of good rollability and dispersion, plus its small volume, light and loose structure, specific surface area and nitrogen adsorption, which makes it evenly distributed in rubber when used as a curing agent, with a large contact area with hydrogen sulphide and a greater chance of interfacial reaction, plus the product has the function of promoting the conversion of active substances and zinc oxide into zinc sulphide with a high conversion rate. Therefore, as a vulcanisation accelerator and a better reinforcing agent for synthetic rubber, it is 50-70% of the amount of common zinc oxide.
2. Used in the rubber industry as a stabilizer for ultraviolet light, it can make polyethylene better gas resistance.
3. The zinc resin prepared by acid reaction with resin can be used to produce fast drying ink with good colouring effect.
4、The desulphurizing agent made of zinc oxide has the characteristics of large specific surface area, high permeation sulphur capacity, high mechanical strength, large stacking gap and small bed pressure drop. It is widely used in the deep desulphurisation and purification process of industrial raw materials such as total ammonia, methanol and hydrogen production gas and oil. At a certain temperature and pressure, it can effectively reduce the concentration of trace hydrogen sulphide and organic sulphur in the gas.
(2) Characteristic uses of basic zinc carbonate
Mainly used as catalyst, desulphurization agent, also used as natural rubber, butyl rubber, butyl rubber, nitrile rubber, neoprene rubber, EPDM rubber, rubber active agent, used in large quantities in the manufacture of transparent products.
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