Application of Wollastonite in Interior Wall Latex Paint

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The main components of wollastonite are silica and calcium oxide, because of its special needle-like structure, it helps to improve scrub resistance and improve workability, and it has high whiteness and refractive index, high dielectric, high resistance, non-magnetic, strong heat resistance, abrasion resistance, alkali resistance, low temperature chemical inertness and low oil absorption, so it has attracted much attention. Wollastonite is particularly suitable for the production of white and light colored paints. Some pigments will be severely discolored after ultraviolet irradiation. However, wollastonite has good stability. Wollastonite can replace 5% titanium dioxide in latex paint and 30%-40% titanium dioxide in water-based paint without affecting its hiding power.

As the price of titanium dioxide in the entire international market continues to rise, looking for cheaper cover filler is also a top priority for various coating companies. At present, looking for lower-priced titanium dioxide is the first choice for many companies, and wollastonite is a new type of substitute that cannot be ignored. Filler.

In the interior wall latex paint system, the needle-like or fibrous structure of wollastonite can improve the porosity of pvc interior wall latex paint, and its 95% whiteness is helpful to improve the hiding power. Therefore, even if 20%-30% titanium dioxide in the formula is replaced, the dry and wet hiding degree will not be affected, the low oil absorption of wollastonite can also reduce the viscosity of the paint, and the addition of wollastonite will not affect the scrub resistance of the paint, however, when the replacement amount reached 40%, the hiding power of the coating decreased more seriously, but the scrubbing resistance was significantly improved, indicating that the grinding performance of wollastonite was better than that of the same amount of titanium dioxide.

Therefore, wollastonite can replace 20%-30% titanium dioxide in the system without affecting the coating covering and scrubbing resistance, which can not only improve the scrubbing resistance of the coating film, but also have some PH value adjustment functions. In addition, the needle-like structure of wollastonite has good resistance to cracking, good weather resistance, wollastonite powder as an important filler will also be more and more used in exterior wall coatings.

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