A method of preparation of titanium dioxide watery dispersion and its products and applications
A water-based dispersion, titanium dioxide technology, used in chemical instruments and methods, fibrous fillers, coatings, etc., can solve the problems of pigment particle precipitation, poor compatibility, poor covering power, etc. Good storage stability, hiding power and good weather resistance
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[0033] like figure 1 As shown, a preparation method of titanium dioxide aqueous dispersion, comprising the following steps:
[0034] 1) Preparation of titanium dioxide suspension:
[0035] The titanium dioxide powder is added to the aqueous solution containing sodium hexametaphosphate, and the titanium dioxide suspension is obtained after dispersion and grinding; in terms of parts by mass, the total mass of the titanium dioxide suspension is 100 parts, including the following components:
[0036] 30-60 parts of titanium dioxide powder, 1-5 parts of sodium hexametaphosphate, and the balance is water;
[0037] 2) Preparation of alumina-coated titanium dioxide:
[0038] The titanium dioxide suspension obtained in step 1) was placed in an electrolytic cell, and the pH value was adjusted to 9.0 to 13.0. The aluminum sheets used as anode and cathode were placed in the electrolytic cell and connected to the positive and negative electrodes of the AC power supply, heated and stirred...
Embodiment 1
[0068] like figure 1 As shown, a preparation method of titanium dioxide aqueous dispersion, comprising the following steps:
[0069] 1) In parts by mass, add 3 parts of sodium hexametaphosphate in mass to 57 parts of water, then add 40 parts of titanium dioxide in mass, and grind 5 times with a grinder after uniform dispersion to obtain titanium dioxide suspension. turbid liquid;
[0070] 2) The titanium dioxide suspension obtained in step 1) is placed in an electrolytic cell, the pH value is adjusted to 11.0 with a sodium hydroxide solution, and two aluminum sheets as anode and cathode are placed in an electrolytic cell and connected to an alternating current power supply. The positive and negative electrodes of , the voltage is set to 30V, the frequency is 3000Hz, the heating temperature is 40°C, the stirring rate is 600r / min, and the reaction time is 30h; filter and dry to obtain alumina-coated titanium dioxide;
[0071] 3) adding 0.5 parts of surfactant A1 and 2.5 parts ...
Embodiment 2
[0073] like figure 1 As shown, a preparation method of titanium dioxide aqueous dispersion, comprising the following steps:
[0074] 1) adding 5 parts of sodium hexametaphosphate in quality to 35 parts of water, then adding 60 parts of titanium dioxide in quality, and after dispersing evenly, grind 8 times with a grinder to obtain a titanium dioxide suspension;
[0075] 2) The titanium dioxide suspension obtained in step 1) is placed in the electrolytic cell, the pH value is adjusted at 13.0 with potassium hydroxide pH value regulator, and two aluminum sheets as anode and cathode are placed in the electrolytic cell and Connect the positive and negative poles of the AC power supply, the voltage is set to 50V, the frequency is 2000Hz, the heating temperature is 50°C, the stirring rate is 500r / min, and the reaction time is 36h; filter and dry to obtain alumina-coated titanium dioxide;
[0076] 3) adding the quality of 2 parts of surfactant A2 and the quality of 2 parts of surfac...
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