Surface Modification Of Ground Calcium Carbonate By Modified Fatty Acid And Its Application In Polymer

Ground calcium carbonate is a kind of pigments and fillers used very extensively, which involve areas of plastics, rubber, paper, ink and paint, and so on. Ground calcium carbonate need to be modified before using and fatty acids, such as saturated stearic acid and unsaturated oleic acid, are the common surface modifiers because of its cost-effective, wide range of sources mentioned and renewable. Anchoring with calcium carbonate is one of the functions of the modifier, which can prevent particle reaggregation and improving the compatibility between calcium carbonate and organics with solvated chains is another one. However, the combination of stearic acid and oleic acid with calcium carbonate is single-point anchored, which is not strong enough that led to bad performance in surface modification of calcium carbonate and product either;Besides, the way in combination of solvated chain segments of stearic acid and oleic acid with the organic is physical entanglement, causing the decline of film properties for a large number of fatty acids which can not be involved in curing process in special occasions, such as UV floor coating. In order to solve the problem mentioned above, a modified fatty acids1-SRG-MA with double-anchor point and a modified fatty acids S-2-E with photosensitive cross-linking solvated chain, based on fatty acids such as stearic acid and oleic acid, were synthesized.In chapter2, a modified fatty acids1-SRG-MA with multi-anchor point, based on1-stearoyl-rac-glycerol and maleic anhydride, was synthesized and used for modification of ground calcium carbonate. The best modified dosage of1-SRG-MA was explored by oil absorption value test, active rate test and settling volume test; Infrared spectrum confirmed that the modifier was successfully grafted to the surface of ground calcium carbonate; Scanning electron microscopy showed that the agglomeration of modified calcium carbonate is reduced; compared the oil absorption value before and after extraction by Soxhlet,1-SRG-MA is better than stearic acid SA in the anchoring of CaCO3.In chapter3, a modified fatty acids S-2-E with photosensitive cross-linking solvated chain, based on based on oleic acid (OA),2-hydroxy-40-(2-hydroxyethoxy) -2-methylpropiophenone (D2959) and succinic acid anhydride(SA), were synthesized and used for modification of ground calcium carbonate. The best modified dosage of1-SRG-MA was explored by oil absorption value test and active rate test settling volume test;Infrared spectrum confirmed that the modifier was successfully grafted on the surface of ground calcium carbonate; Scan electron microscopy showed that the agglomeration of modified calcium carbonate is reduced; compared the oil absorption value before and after Soxhlet extraction, the modified effects of S-2-E is the same as stearic acid (SA). DPC confirmed that S-2-E-CaCO3is photosensitive, however, S-2-E-CaCO3system is smaller than plus photoinitiator system in monomer polymerization rate and conversion rate.In chapter4, photosensitive S-2-E-CaCO3was applied to UV coatings and OA-CaCO3was used as the contrast to study the effects of S-2-E-CaCO3on UV-cured film via Dynamic Mechanical Analysis, hardness test, water resistance test and resistance to ethyl acetate test. The results showed that UV-cured film filled with S-2-E-CaCO3is higher than that with OA-CaCO3in storage modulus and glass transition temperature, besides, other aspects of performance such as UV-cured film hardness, water resistance and ethyl acetate resistance, is far superior.