Hydrophobic lipophilic surface-modified calcium carbonate and preparation method thereof

Abstract

Disclosed hydrophobic lipophilic surface-modified calcium carbonate is characterized by being prepared from the following raw materials in parts by weight: 90-95 parts of calcium carbonate, 2-3 parts of glass fiber, 5-7 parts of polylactic acid, 2-3 parts of polydimethylsiloxane, 3-5 parts of epoxidized triglyceride, 3-5 parts of silica sol, 1-1.5 parts of wood tar, 2-3 parts of titanium tetrachloride, 2-3 parts of expanded perlite, and 2.5-3.5 parts of modified titanium dioxide. By adding polydimethylsiloxane, expanded perlite, wood tar and other hydrophobic waterproof compositions and oily high-molecular polymers, the surface of calcium carbonate is changed into hydrophobicity from hydrophilicity, the effect of calcium carbonate with a polymer interface is enhanced, and a modified unsaturated bond gives play to crosslinking effect during processing with a polymer. The hydrophobic lipophilic surface-modified calcium carbonate can be used to fill plastic, rubber, adhesives and the like.

Description

technical field [0001] The invention relates to the field of industrial fillers, in particular to hydrophobic and lipophilic surface-modified calcium carbonate and a preparation method thereof. Background technique [0002] Calcium carbonate is a commonly used inorganic filler. It is widely used in rubber, plastics, coatings and other fields 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 directly or in large quantities filled in organic matrix materials, 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 composite materials. Therefore, in order to broaden its application field, it is necessary to modify the surface of heavy calcium carbonate to make its surface lipophilic and...

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 directly or in large quantities filled in organic matrix materials, it is not only difficult to disperse evenly, but also has a weak binding force with the matrix. , resulting in defects at the two-phase interface and some performance degradation of the composite

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