Modification methods for surface treatment of titanium dioxide for plastics and coatings

1. The modification method for surface treatment of titanium dioxide powder is characterized in that the cored titanium inner powder is first dispersed in an ionic polyacrylamide aqueous solution by mechanical grinding. Then, the dispersed core is coated with double layers of inorganic and organic composite oxides. The inorganic inner layer is coated by sol-gel method; the organic outer layer is coated by adsorption between polar chemical bonds. The filter cake obtained by filtration after coating is dried by a crushing and drying machine, and fine and ultrafine titanium dioxide products are respectively collected in a cyclone separator and a bag filter machine
2. The dispersion method according to claim 1, characterized in that an ionic polyacrylamide aqueous solution is used as the dispersion, and the concentration range is (0.3-0.0) 5) The liquid ratio between the 10 'dispersion solution and titanium dioxide powder ranges from 2 to 3. When the dispersion time exceeds 35 minutes, the dispersion temperature rises from room temperature to above 45 ℃
3. The coating method for the inner layer coating as claimed in claim 1, characterized in that the total solute molar concentration of inorganic composite sol: silica and alumina ranges from 0.3 to 0 5mol/l, the molar concentration ratio between silica and alumina is less than 0.34; The application range of this composite sol is 0.3-1.5% of the nuclear mass M.
4. The coating method for the inner layer coating as claimed in claim 1, characterized in that the inorganic composite sol: alumina zirconia (M total solute weight+concentration range, 0.25-0.35mol/l; the ratio of their molar concentrations is 10-15%). The dosage of the composite inorganic treatment agent is 0.5-1.5% of the core mass.
5. The coating method of the outer coating according to claim 1, which is characterized in that the water-soluble silicone oil lotion, or sodium stearate and polyacrylic acid emulsion are diluted with hot water. The temperature of the hot water exceeds its melting point temperature, the concentration range of the organic solution is 5-10%, and then it is gradually added to the slurry to complete the inorganic coating. The coating time and aging time exceed 35 minutes: the coating temperature and aging temperature are higher than 60 ℃. The dosage range of sodium stearate solution or organic water-based lotion is (0.3-1.5)% of the core coating mass.
6. The aging method as claimed in claim 1, characterized in that the aging temperature of the felt after 1: sequence is higher than 35 ° C above room temperature.
7. The filtration method according to claim 1, characterized in that the temperature of the filtered liquid after aging 1 is above 35 * C of room temperature.
10. The drying method as claimed in claim 1, characterized in that the hot air inlet and outlet temperatures of the crushing dryer exceed 2100 ℃ and 100 ℃, respectively.
9. The co encapsulation method as claimed in claim 1, characterized in that the partially co encapsulated materials include Li De powder, barium sulfate, talc, mica, etc. Their substitution amount is less than 15% (product count).