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Gloss improvement Nov 24, 2016

1. Preparation of nano-TiO 2 colloidal particles

Titanium powder with the right amount of concentrated hydrochloric acid is in a digestion tube, n, under the protection of heat water bath to titanium powder dissolves, forming TiCl solution. Filtering, use distilled water to oxygen and hydrochloric acid is diluted to the desired concentration. Participates in a photochemical reaction with a good ~TiCl solution, to 30mj/mjn flow into the gas to prevent oxidation of the Ti0 Ai, at a certain temperature, acidity and stirring conditions, using ultraviolet light for photochemical reaction system size for TiO 15~30nm. Micelles. Light main reaction type is:

2. Nano-TiO 2 sealant on surface modification of titanium-MICA experiment

Li-hua Pearlescent pigment pigments and nanoscale TiO made suspension micro-particle colloidal solution (L/S=25), under certain conditions of temperature, pH value and stirring response filter after a certain time, from washing to no Cl, after drying at 800-900. C under calcination 1~2H, Nano-TiO rutile, modification of micro-particle coating of titanium-MICA Pearlescent pigments.

According to our experiments indicate that this method can make the average reflectance of pigments is 5% coating layer is more dense and smooth, can significantly improve the pearlescent effect. Surface screen printing of optimum process parameters for pH=1. 50, the reaction temperature is 75. C, stirring rate for 170Y/m_n, time 4H. Mixed with nanometer TiO, charged impurity ions, particles are different, would destroy the Nano TiO, single dispersion particles lead to the flocculation, affect the printing results. Screen printing Pearlescent pigments to 800~900. C calcination, which crystal anatase into rutile, better Pearlescent effect.