Preparation method of titanium dioxide for latex paint
A technology of titanium dioxide and mesoporous titanium dioxide, which is applied in the field of titanium dioxide, can solve the problems of limited purification efficiency of plant absorption method, unsustainable spraying effect of purifier, and inability to put into production and use, so as to promote the transmission of photogenerated electrons, excellent photocatalytic activity, Effect of increasing adsorption force and contact area
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experiment example 1
[0044] Preparation of mesoporous titania:
[0045] 1) Take 50 parts by weight of industrial titanium dioxide, add 10mol / L NaOH solution, stir to completely dissolve the industrial titanium dioxide, add deionized water according to the volume ratio of the solution to deionized water is 1:5, and mix well; Concentrated hydrochloric acid with a mass fraction of 38% was added dropwise to the above solution, the volume of the concentrated hydrochloric acid and the solution was 6:1, after the addition was completed, the reaction was continued for 30 minutes;
[0046] 2) Put the above solution in a high-pressure hydrothermal reaction kettle, react at a temperature of 180° C. for 6 hours, wash the obtained precipitate twice with deionized water, once with absolute ethanol, and dry to obtain porous titanium dioxide.
[0047] The specific surface area of titanium dioxide prepared in Experimental Example 1 is increased, and its photocatalytic activity is greatly improved.
experiment example 2
[0049] Preparation of inorganic coated mesoporous titania:
[0050] This experimental example 2 is based on the experimental example 1, the titanium dioxide prepared in the experimental example 1 is further treated to improve the hiding power of the added titanium dioxide latex paint, so as to obtain the special titanium dioxide for latex paint with better performance. In this embodiment, the mesoporous titanium dioxide prepared in Experimental Example 1 was selected as the raw material, and the following step 3) was performed.
[0051] Step 3): Prepare the mesoporous titanium dioxide in step 2) of Experimental Example 1 with deionized water to make a slurry, add NaOH solution to make the pH of the slurry 9 to 9.5, and ultrasonically disperse for 1 minute; stir and slowly add aluminum silicate Fine powder, the molar mass ratio of aluminum silicate to NaOH is 1:4; add hydrochloric acid with a mass fraction of 38% dropwise, control the pH value to 7.5-8.5, and keep the temperatu...
Embodiment 1
[0066] In this example, on the basis of Experimental Example 2, the titanium dioxide prepared in Experimental Example 2 is further processed, so as to obtain titanium dioxide special for latex paint with better performance. In this embodiment, the titanium dioxide prepared in Experimental Example 2 with a coating ratio of 39% to 69% is selected as a raw material, and the following step 4) is performed.
[0067] Step 4): Put the titanium dioxide with a coating ratio of 39% to 69% prepared in step 3) of Experimental Example 2 in a supercritical fluid kettle, set the temperature at 70°C, and use the heating element in the supercritical fluid kettle to heat After reaching the set temperature, keep the temperature for 3 minutes, then feed a certain proportion of supercritical hydrogen / argon fluid with a pressure of 4.86Mpa (the volume fraction of the hydrogen is 8%, and the volume fraction of the argon is 92%), The volume ratio of supercritical fluid to titanium dioxide is controll...
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