Modified heavy calcium carbonate special for paint and preparation method and device thereof

Abstract

Modified heavy calcium carbonate special for paint is prepared by mixing organic materials and inorganic materials. The oil absorption value of the modified heavy calcium carbonate is 17-20 g of oil per 100 g, and the ratio of parts by weight of the organic materials to the inorganic materials is 6-8:1000. According to parts by weight, the inorganic materials include heavy calcium carbonate, aluminum nitride, alpha-aluminum oxide, nano-silica, kaolinite and diatomite, and the organic materials include one or more of oleic acid polyoxyethylene ester, polyethylene wax, styrene and triphenyl phosphate. The materials are stirred to prepare the modified heavy calcium carbonate. The modified heavy calcium carbonate has the advantages that the adding amount of filler can be increased, the use quantity of resin adhesives can be reduced by 3-5%, 15-20% of the use amount of talcum powder, barium sulfate and titanium dioxide can be partially replaced, the use quantity of colorants, antioxidants and brighteners in the paint is reduced by about 5%, and raw material cost is lowered; meanwhile, the production process is environmentally friendly and saves energy, and construction is convenient.

Description

technical field [0001] The invention relates to the field of paints and coatings, in particular to a modified heavy calcium carbonate specially used for paints and coatings and a preparation method and device thereof. Background technique [0002] Ground calcium carbonate is a commonly used inorganic filler. It is widely used as a filler in paints and coatings due to its wide source and low price. However, the surface of heavy calcium carbonate is hydrophilic and oleophobic, the specific surface area is large, the surface energy is high, and the particles are easily agglomerated. When it is directly or in large quantities filled in paint coatings, it is not only difficult to disperse evenly, but also has a weak binding force with the matrix. , leading to two-phase interface defects and some performance degradation of paint coatings. Therefore, it is necessary to modify the surface of heavy calcium carbonate to make its surface lipophilic and hydrophobic, enhance the compati...

AI Technical Summary

Problems solved by technology

However, the surface of heavy calcium carbonate is hydrophilic and oleophobic, the specific surface area is large, the surface energy is high, and the particles are easily agglomerated. When it is directly or in large quantities filled in paint coatings, it is not only difficult to disperse evenly, but also has a weak binding force with the matrix. , leading to two-phase interface defects, some performance degradation of paint coatings

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