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Several application areas of ultrafine barium sulfate!
- 2020-03-19-

Several application areas of ultrafine barium sulfate!


As a non-toxic barium salt, barium sulfate (BaSO4) is a white amorphous powder with stable chemical properties, good weather resistance and chemical resistance. It is a basic inorganic chemical raw material with excellent physical and chemical properties. , Plastics, coatings, papermaking, medical and other fields have a wide range of applications.


Ultrafine barium sulfate generally refers to powder 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, and its main purpose is as a filler for paints (oil-based paint, powder paint, water-based paint, special paint, etc.).


The use of ultrafine barium sulfate as a filler can reduce the production cost of coatings. The additive amount of art pigments accounts for 30% of the total solids, and the amount of yellow and white pigments can reach 80%-90%, and watercolors account for 15%. Barium sulfate used in coatings generally requires stable whiteness, pH<8, no="" mechanical="" impurities,="" and="" no="">


2. Plastic and rubber industry


The introduction of some ultra-fine barium sulfate into the polymer matrix will greatly affect its mechanical properties. The addition of barium sulfate has a crucial impact on the mechanical properties of composite materials. Generally speaking, as the addition of barium sulfate increases, the toughness and strength of the composite material will first increase and then decrease, and a small amount (mass fraction) <5%) 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="">


At the same time, the introduction of ultrafine barium sulfate particles affects the thermal properties of the polymer mainly in two aspects. One is to change the crystalline properties of the polymer matrix; The stability has changed.


Ultra-fine barium sulfate will become the heterogeneous core of crystal growth during the cooling and crystallization process of polymer melt, which has a certain promotion effect on the crystallization process, such as increasing the crystallization temperature, accelerating the crystallization rate, increasing the crystallinity, and forming special crystals. It also destroys the perfection of the crystal, and has the effect of refining the crystal grain.


3. Paper industry


Barium sulfate has high whiteness and strong hiding power. Superfine barium sulfate can be used as one of the raw materials for the production of copper paper surface coating agent, and its addition amount is 5% to 15%. The fine barium sulfate particles with scaly morphology can be used to make copy paper, which can make the paper surface smooth and shiny. It is especially suitable for information paper that requires extremely high surface smoothness, such as color copy paper.


4. Ink and pigment industry


Superfine barium sulfate has many performance indicators (strength, whiteness, oil absorption, refractive index, etc.) close 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 it The purpose of product hiding power can also improve product weather resistance, acid and alkali resistance and other indicators.


Ultra-fine barium sulfate particles can be used as a dispersant in colored pigments used in coatings, printing, inks, etc., to make the hue more vivid, gloss, smoothness and fullness.


Ultrafine barium sulfate is used as a filler in the production of color lead printing inks. The addition amount is 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 developed polyethylene (PE)/barium sulfate composite materials can solve the problems in the use of T-type copper-containing contraceptive devices in clinical applications. The fine and uniform barium sulfate can also be used as an auxiliary or additive for X-ray dual imaging technology.