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Yuan Lei's Little Knowledge | Which Coating (I) Are Different Mineral Powders Suitable

Release time:

2024-01-29 09:34

Non-metallic minerals are mainly used as functional fillers in the coatings industry. The purpose is to reduce the cost of coatings; increase the consistency of latex paint, improve the suspension of pigments in the paint; give coatings functionality and improve their properties, including gloss, hiding Power, flow and homogenization, durability, film thickness, penetration and rheology.

There are many kinds of mineral fillers and their performance varies greatly. Therefore, it is the key for non-metallic mineral powder manufacturers to open the coating market to thoroughly understand the performance and best application of mineral fillers.

 

 
 

water-based coatings

Water-based coatings are a class of environmentally friendly coatings that have developed rapidly in recent years, and their solvents are mainly water or water-based solvents. In addition to all mineralogically useful features, the role of the chemical composition of the filler is very important in waterborne coatings.

One is that the mineral filler should be stable under acid and alkali conditions, and the water soluble matter has little water content. These characteristics are particularly important in the anti-corrosion coating series;

Second, in order to obtain good activity (wettability) and dispersibility, mineral fillers must be hydrophilic, otherwise they will flocculate;

Third, the specific surface area is low, because the amount of adhesive and surfactant in the coating is extremely small, and the adhesive ability and hindering function of the emulsified resin (adhesive) are not high. Considering the cost, the amount of adhesive should be as small as possible.

(I) talc

Talc has a good hydrophilic character and does not disperse thoroughly in water unless a deflocculant is added. Where the activity and dispersing power must be increased, the lamellar morphology of the talc must be retained in order to enhance the mechanical properties (resistance to cracking).

In interior wall coatings, talc can be used as a flow regulator, matting agent and titanium dioxide supplement. Talc also improves the wash-off resistance of the coating.

(II)Kaolin

Because of good hydrophilicity, kaolin in water-based coatings dispersion is very good, can be used to induce thixotropy and improve the anticoagulant, but also to improve the ability to wash and improve whiteness, irregular granular coarse kaolin can reduce the coating gloss.

Calcined kaolin has a low aging rate, so it can also be used as a building exterior wall coating. Without affecting the gloss of the coating, with ultrafine high whiteness of kaolin can replace 10-20% of titanium dioxide, when the particle size of kaolin and titanium dioxide is very similar, can be a good place to replace the space occupied titanium dioxide particles.

 

 

(III) Wollastonite and Nepheline Syenite-like Minerals

Wollastonite and nepheline syenite minerals are alkaline minerals (pH 10), especially suitable for water-based paint series, they can improve the storage stability of paint. Since nepheline syenite is well suited for use in waterborne coatings, the modification of waterborne coatings requires only an increase in the amount of mineral used in the nepheline syenite, which is now used as a functional filler in new surfactant-free coatings because it is readily dispersible in the waterborne series of coatings.

(IV) dolomite

Dolomite has high brightness, flake, small particle size (D50=0.3~0.4 μm), hydrophilic, can be used as a substitute for titanium dioxide, in white paint instead of 30% of titanium dioxide, without affecting the hiding power of the coating.

Suitable for, paint, mineral, waterborne, filler, kaolin, titanium dioxide, talc, improvement, nepheline

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