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Effect of barium sulfate, wollastonite and illite on the performance of waterproof coatings

Release time:

2024-01-29 09:38

Effect of barium sulfate, wollastonite and illite on the performance of waterproof coatings

 

Waterproof coating is a general term for a waterproof film material with waterproof performance formed by coating and construction. Waterproof coatings are mainly used for some structural parts or structural components of buildings that may be eroded by water, such as roofs, basements, bathroom rooms, water towers, pools, water storage tanks and other structures of waterproof, moisture-proof and impermeable.

For acrylic waterproof coatings, precipitated barium sulfate, wollastonite, heavy calcium carbonate, sericite, illite and other mineral materials are important functional fillers, but their mineral forms are different, which have different effects on the performance of waterproof coatings.

 

Application of precipitated barium sulfate (granular) in coatings

 

Barium sulfate in the building waterproof coating as a filler has two forms: natural mineral barite as raw material processing preparation of barite powder and chemical production of precipitated barium sulfate. Due to the needs of some special functions, the general choice of building waterproof coating with precipitated barium sulfate.

Precipitated barium sulfate because of low oil absorption, high density, granular or spherical structure, used in waterproof coatings, can improve the film covering, compactness and other properties, improve product light resistance, weather resistance, chemical and electrochemical corrosion resistance, can enhance the impact strength of the coating. The precipitation of barium sulfate and titanium dioxide in the waterproof coating has a synergistic effect on titanium dioxide, thereby reducing the amount of titanium dioxide.

 

Application of Wollastonite (Needle) in Waterproof Coatings

 

Wollastonite is used in building waterproof coatings, and its needle-like structure has anti-cracking properties, which helps to improve the wear resistance and durability of the paint film, and enhance the hardness and strength of the paint film. Mixed with wollastonite color acrylic waterproof coating, in addition to bright color, the construction also has good leveling.

 

Application of illite (flake) in waterproof coating

 

Illite is a potassium-rich silicate mica clay mineral, which is often irregular scale-like aggregates under the electron microscope.Similar to montmorillonite.

Illite is rich in potassium, high aluminum, low iron and smooth, bright, fine, heat resistant and other superior chemical and physical properties. Illite as a filler of waterproof coating can improve the dispersion, heat resistance, frost resistance and water resistance of the coating. The illite powder can reflect ultraviolet light and adsorb the coating into the lattice layer. The coating used as filler can not fade for a long time and improve the performance of the coating.

 

comprehensive comparative analysis

 

The purpose of adding various mineral materials to acrylic waterproof coatings is mainly to improve the mechanical properties of the coating film, improve the durability and impermeability of the product..

from different forms of mineral materials/Acrylic waterproof coating system performance test results combined with micro fabric analysis, it can be seen that the morphology of mineral materials in the acrylic waterproof coating system, have different effects:

The wollastonite particles are columnar and needle-like, which show obvious reinforcing effect in acrylic waterproof coating;

Illite is a flaky mineral material, which has a certain reinforcing effect in acrylic waterproof coating, but more advantages should be in the durability and impermeability of the product;

Precipitated barium sulfate is a granular or massive mineral material, its advantages are not enhanced, but in increasing the flexibility of the product, so that the product elongation at break.500%。

In addition, in order to effectively improve the overall performance of the coating, barium sulfate, wollastonite, calcium carbonate, mica, illite and other mineral fillers can be compounded to produce economical, practical and good performance waterproof coating.

 

Waterproof coating, barium sulfate, mineral, illite, acrylic, wollastonite, property, precipitation, material

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Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.