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Extensive use of ultramarine blue, hue it is not instead of, or with other pigments mixed methods can not get. Excellent performance of ultramarine blue, but not acid, acidic atmosphere will make it even faded to gray, thus affecting their effectiveness. Ultramarine pigments currently used for modification of SiO2, although to some extent, improve the acid resistance of Ultramarine, but because of inorganic SiO2, which forms the coating layer is not good enough density, poor adhesion and ultramarine pigments, easy off . Further, since the resin coating inorganic and organic compounds such as poor compatibility resulting pigment in the paint easily gathered into a group, is difficult to disperse uniformly, resulting in decreased gloss coating, the film is poor, and poor flexibility . This topic optional to silane coupling agent modified Ultramarine respectively, which are Y-aminopropyl triethoxysilane (APTES), tetraethyl orthosilicate (TEOS), octyl trimethoxy silane ( OTMOS). First of temperature, water, the molar ratio of silicon, catalyst, time on the hydrolysis-condensation product was APTES ultramarine pigment surface loading rate. APTES to determine the optimal conditions for modification of ultramarine pigments. Then prepare different load rate modification ultramarine pigments, pigment using these modified pigment printing, compare their application performance, The optimum load rate. Last modified in the best conditions and the best load rate conditions, respectively TEOS and OTMOS modified on ultramarine pigments, compare the three silane coupling agent ultramarine pigments modification effect. In this paper, self-mixing mill laboratory to study the milling time, the ball feed ratio, colorant concentration of dispersant, ball size and gradation on particle size and distribution of ultramarine. Then different size silane coupling agent modified ultramarine pigments, ultramarine pigments compare the modified application performance, ultramarine blue pigment obtained optimum particle size range. The above studies show, in an amount of 0.5g of ultramarine conditions, with APTES modification of Ultramarine optimum conditions are: modification temperature was 70 ℃, water / silica molar ratio of 15:1, the amount of ammonia 0.4 mL, the reaction time was 3h. APTES modification of Ultramarine, ultramarine pigment surface with APTES hydrolyzed condensate loading rate of increase, the gradual increase in acid resistance, the surface of the pigment ultramarine APTES hydrolyzed condensate load is 50% of the acid can be obtained when a better effect, the printed fabric dipped 0.1% hydrochloric acid for 2min, color progression from the original one to improve to 4-5. The modified pigment printed fabric dry rubbing fastness little change, the wet rubbing fastness of the pigment surface with APTES hydrolyzed condensate loading rate of increase gradually increase, the load was 90%, the wet rubbing fastness increased from two to 4. By comparison APTES, TEOS, OTMOS modified, the load of 50% of the three modified ultramarine pigment dispersion stability, acid resistance and wet and dry rubbing fastness, can draw the best results Ultramarine changed modified Xing agent is APTES. Ultramarine pigment in the milling process, the pigment particle size with milling time decreases with the ball feed ratio, paste the concentration of dispersant increases decreases and then increases, ball size and gradation on pigment particle size little impact. Ultramarine pigments of different particle size modification, the smaller the particle size, acid resistance worse; Sui ultramarine pigment particle size decreases, printed fabric dry rubbing fastness tendency to increase, wet rubbing fastness to decline. Comprehensive ultramarine pigments consider the performance of applications, ultramarine pigment particle size to 800nm ??or so.
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