Five major application areas of ultrafine barium sulfate!
Barium sulfate (BaSO4) is a non-toxic barium salt. It has the appearance of a white amorphous powder, stable chemical properties, good weather resistance and chemical resistance. It is a basic inorganic chemical raw material with excellent physical and chemical properties. It is widely used in rubber, plastics, coatings, papermaking, medical and other fields.
Ultrafine barium sulfate generally refers to powders with a particle size of less than 10μm. Ultrafine treatment can greatly improve product quality and expand its application range.
1. Paint industry
Barium sulfate has high whiteness and good hiding properties. Its main use is as a filler for coatings (oil-based coatings, powder coatings, water-based coatings, special coatings, etc.).
Ultrafine barium sulfate can be used as a filler to reduce the production cost of coatings. Its addition amount in art pigments accounts for 30% of the total solids, and its use in yellow and white pigments can reach 80%-90%, and watercolor accounts for 15%. Barium sulfate used in coatings generally requires stable whiteness, pH <8, no mechanical impurities, and no granularity.
2. Plastic and rubber industry
Introducing some ultrafine barium sulfate into the polymer matrix will greatly affect its mechanical properties. The amount of barium sulfate added has a crucial influence on the mechanical properties of the composite material. Generally speaking, with the increase of the amount of barium sulfate added, the toughness and strength of the composite material will first increase and then decrease. A small amount (mass fraction <5%) of nano barium sulfate can significantly improve the mechanical properties of the composite material, while excessive addition will cause agglomeration and reduce the performance of the composite material.
At the same time, the introduction of ultrafine barium sulfate particles affects the thermal properties of the polymer in two aspects. One is that it changes the crystallization characteristics of the polymer matrix; the other is that it affects the thermal decomposition behavior of the material and changes its thermal stability.
Ultrafine barium sulfate will become a heterogeneous core for crystal growth during the cooling and crystallization process of the polymer melt, and has a certain promoting effect on the crystallization process, such as increasing the crystallization temperature, accelerating the crystallization rate, increasing the crystallinity, forming a special crystal form, etc., and it will also destroy the perfection of the crystal and have the effect of refining the grains.
3. Papermaking industry
Barium sulfate has high whiteness and strong hiding power. Ultrafine barium sulfate can be used as one of the raw materials for producing coated paper surface coating agents, and its addition amount is 5%~15%. Fine barium sulfate particles with scale morphology can be used to make copy paper, which can make the paper surface smooth and shiny, especially suitable for information papers with high requirements for paper surface smoothness, such as color copy paper.
4. Ink and pigment industry
Ultrafine barium sulfate has many performance indicators (strength, whiteness, oil absorption value, refractive index, etc.) similar to titanium dioxide. Adding an appropriate amount of ultrafine barium sulfate to the product can prevent flocculation, thereby reducing the amount of titanium dioxide without affecting the hiding power of the product, and can also improve the weather resistance, acid and alkali resistance and other indicators of the product.
Ultrafine barium sulfate particles can be used as dispersants in colored pigments used in coatings, printing, inks, etc., making the color more vivid, glossy, smooth, and fuller.
Ultrafine barium sulfate is used as a filler in the production of color lead printing inks, with an additional amount of 10%-30%. The quality generally requires a particle size distribution of 15~20μm, a neutral pH, and stable whiteness and oil absorption.
5. Medical field
Adding barium sulfate to polyethylene to prepare X-ray-developable polyethylene (PE)/barium sulfate composite materials can solve the problems in the use of T-type copper-containing contraceptive devices in clinical applications. Fine and uniform barium sulfate can also be used as an auxiliary agent or additive in X-ray double contrast technology.