2016-12-28

Physical properties, uses and characteristics of rubber-grade zinc oxide

Physical properties of rubber-grade zinc oxide: white crystalline system crystals or powder, odorless, non-toxic, fine texture. Relative density 5.606, refractive index 2.008-2.009, melting point 1975. Soluble in acid, sodium hydroxide, ammonium chloride, insoluble in water, ethanol and ammonia, belonging to amphoteric oxide, absorbs carbon dioxide and water in the air to generate zinc carbonate, which is yellow, turns yellow when heated, and recovers white after cooling. It does not transmit ultraviolet light and does not turn black when exposed to hydrogen sulfide. Uses of rubber-grade zinc oxide: In the rubber industry, it is used as a vulcanization activator for natural rubber, synthetic rubber and latex, as well as a reinforcing agent and coloring agent. It can also be used to produce...

2016-12-23

Methods for zinc powder preparation

Zinc powder preparation methods: There are two methods: ball milling and atomization. Ball milling produces coarse zinc powder with a wide particle size distribution, but it has high production efficiency, low energy consumption, and low cost. By strengthening the atomization process and screening and grading technology, finer powder that meets the requirements can also be produced. Atomization produces fine zinc powder with high active metal content. 1. Ball milling method Wet ball milling can prepare zinc powder slurry with a flake structure. The flake structure zinc powder has a large covering power, and the amount of zinc powder used when preparing coatings is less than that of granular zinc powder. Atomized zinc powder and fat

2016-12-02

The difference in the quality of 99.7% zinc oxide

The difference between indirect and direct zinc oxide lies in their manufacturing materials and processes, resulting in different applications. For tires, indirect zinc oxide is generally used because it is produced from zinc ingots and greatly aids in rubber vulcanization. Direct zinc oxide, however, is produced from zinc ash and has poor rubber vulcanization properties, limiting its use to other applications, typically in ceramics. You get what you pay for. The price of any product is based on cost, and zinc oxide is no exception. Costs are related to raw materials and manufacturing processes. Zinc oxide manufacturing methods are divided into dry and wet methods.

2016-11-25

Zinc oxide—Sunscreen in cosmetics

Zinc oxide is used in sunscreens because it acts as a UV ray reflector, using reflection to resist the two main culprits we know: UVA and UVB. UVB has a wavelength of 280-320nm, and UVA has a wavelength of 320-400nm. Zinc oxide can reflect ultraviolet rays with a wavelength of 280-400nm (some data shows it to be 280-390nm). In any case, this wavelength range is quite long. Combined with titanium dioxide (TitaniumDioxide), they can achieve full protection against UVB and UVA. Zinc oxide

2016-11-17

Zinc oxide function - latex glove additive

Latex gloves are a type of glove made from latex and zinc oxide. Made from natural latex and other fine auxiliaries, latex gloves undergo special surface treatment, making them comfortable to wear. They are widely used in industrial and agricultural production, medical care, and daily life. Latex gloves made from 100% natural latex have high dexterity, are very comfortable to wear, and have high strength. With a low pinhole rate, they have excellent sealing and protective properties. They are widely used in electronics, food, medicine, and optoelectronics industries. Zinc oxide and natural latex are essential additives for latex gloves, and are also used in

2016-11-09

The role of zinc oxide in coatings

The Role of Zinc Oxide in Coatings Zinc oxide is an alkaline compound that reacts with trace amounts of free fatty acids to form zinc soaps, which tend to thicken the paint. It dissolves in inorganic acids or acetic acid. Zinc oxide has a high refractive index and the ability to absorb ultraviolet light. It also has strong coloring power and hiding power, but its color is pure white, it does not chalk, and it has good light and heat resistance. It can form coordination compounds with carboxylate ions in the coating, thereby reducing the sensitivity of the coating to water. Therefore, zinc oxide can improve the weather resistance and anti-chalking ability of the coating, making it suitable for exterior wall coatings. Zinc oxide makes the product coating flexible, firm, waterproof, and ...

2016-10-31

Market Development Status of Zinc Oxide

While zinc oxide isn't a new product, it's an extremely important component in shoe materials, especially in foamed materials. First, let's understand what zinc oxide is. Zinc oxide is an oxide of zinc. It is insoluble in water but soluble in acids and strong alkalis. Zinc oxide is a commonly used chemical additive, widely used in the production of plastics, silicate products, synthetic rubber, lubricating oils, paints and coatings, ointments, adhesives, food, batteries, flame retardants, etc. I. Current Status of the Zinc Oxide Industry: Currently, there are three main production methods for zinc oxide: direct method, impregnation method, and indirect method. 1. Direct Method

2016-10-24

Zinc oxide is the best activator for sulfur vulcanization of natural rubber

Zinc oxide, as a rubber vulcanization activator, is widely used due to its comprehensive functions. To date, zinc oxide remains the best activator for sulfur vulcanization of natural rubber. Zinc oxide, stearic acid, sulfur, and accelerators together constitute the vulcanization system. Zinc oxide and stearic acid form zinc stearate, which can accelerate sulfur vulcanization together with the accelerator. If sulfur is used alone, the vulcanization process will be very long. However, the release of zinc during the production, processing, and recycling of rubber products can have adverse effects on the environment, human health, and especially aquatic organisms. A new trend in rubber industry production is to reduce the zinc content in products and to explore alternatives.

2016-07-30

A Brief Discussion on the Applications of Zinc Powder

Zinc, as a basic metal, plays a significant role in economic life and has a wide range of applications. Zinc powder, as an important form of zinc, is widely used in daily life. The price of zinc powder is relatively lower than that of ordinary zinc, which greatly expands the application space of zinc powder. Zinc powder, pure zinc is a gray metal, with metallic luster, melting point 419.5℃, boiling point 918℃, density 7.13g/cm3. The raw material used to manufacture zinc powder is zinc ingot, with the grade ZN-4 and a purity of 99.5%. Zinc has considerable corrosion resistance in the atmosphere, but it is not corrosion-resistant in acidic and alkaline salts. When zinc is in contact with metals with stronger positive electricity,

2016-07-05

Zinc oxide: A case study of contemporary computational solid-state chemistry research

Abstract: Computational techniques have been extensively applied to the study of the chemical and physical properties of zinc oxide. Atomic-scale and density functional theory methods are used to investigate structural, thermodynamic, surface, and defect properties. This paper investigates the structure and energy of zinc oxide nanoparticles. While bulk properties have been extensively described from both fundamental and applied perspectives due to the physical and chemical properties of zinc oxide, here we focus on computational efforts. Polymorphism and physical properties: Over a wide range of temperatures and pressures, including ambient conditions, zinc oxide exhibits a wurtzite (B4) crystal structure (mineral zincite), with all atoms in tetrahedral coordination.