What are the benefits of adding barium sulfate to water-based industrial anti-corrosion paints?

What are the benefits of adding barium sulfate to water-based industrial anti-corrosion paints?

Barium sulfate is an amorphous white powder, slightly soluble in water and insoluble in acid. The solubility in water is only 0.0024g/100g. Soluble in hot concentrated sulfuric acid. It has the advantages of strong chemical inertness, good stability, acid resistance, alkali resistance, moderate hardness, high specific gravity and good whiteness. It can be used as a white filler, and barium sulfate manufacturers can also be used as a filler in rubber and paper, which can increase its weight and lubricity. It can be used as filler, brightener and weighting agent in rubber, plastic, paper, paint, ink, coating and other industries. As a clarifying agent for glass products, it can defoam and increase gloss.

In recent years, preferential policies for water-based coatings have followed one after another: first, the paint consumption tax was officially implemented, and secondly, the state officially levied sewage charges on volatile organic compounds. The squeeze effect of this policy on the paint living space should be very obvious. However, in my country, industrial coatings account for more than 60% of the share, which is still the world of traditional coatings, and the proportion of water-based coatings is less than 5%.

Water-based industrial coatings use water as a diluent, which is a new type of environmentally friendly anti-rust and anti-corrosion coatings different from oil-based industrial coatings. Waterborne industrial coatings are widely used in bridges, steel structures, ships, electromechanical and steel. Due to the energy saving and environmental protection, it will not cause harm and pollution to the human body and the environment, and is very popular among users. It is the future development direction of the coating industry and a substitute for coatings.

Nano-precipitated barium sulfate is to further process the modified precipitated barium sulfate, so that its D50 (median particle size distribution) is controlled between μm. Due to the high processing requirements, there are few domestic manufacturers that can produce nano-precipitated barium sulfate, and the price is relatively high. Nano-precipitated barium sulfate is mainly used in paint, coating and other industries.

The barium sulfate index directly affects downstream products, such as uneven particle diameter and particle size in plastics or coatings, which affects the overall function of the product. How to distinguish the mass of barium sulfate? Of course it also affects the shape of the particles. In general, the particle size distribution is uniform and the effect of particle shape depends on the specific product.

Barium sulfate contains a lot of impurities. Due to artificial synthesis, the noise of barium sulfate is greatly reduced, but more or less mechanical impurities will be generated during the production process. The less impurities, the less difficult the machine black spots, and the better the quality. Production costs can be saved due to low oil volumes, and dispersion also affects product quality.

As an extender pigment, barium sulfate is used in coatings, which plays an important role in improving the thickness, wear resistance, water resistance, heat resistance, surface hardness and impact resistance of coatings. In addition, barium sulfate has high reflectivity in the wavelength range of 300-400 microns, can protect the coating film from light aging, and is an effective and inexpensive white inorganic light stabilizer. Due to its low oil absorption and high filling amount, it can reduce the cost of coatings and can be used for water-based coatings, primers, center coatings, oil-based coatings, etc.