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Preparation method of special high-covering-power titanium dioxide for papermaking

A covering power, titanium dioxide technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of cumbersome operation, complex process, strict control of coating conditions, etc.

Inactive Publication Date: 2020-04-21
JINAN YUXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the domestic Zr-Al coating has complex process, cumbersome operation, long production cycle, and strict control of coating conditions.

Method used

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  • Preparation method of special high-covering-power titanium dioxide for papermaking
  • Preparation method of special high-covering-power titanium dioxide for papermaking
  • Preparation method of special high-covering-power titanium dioxide for papermaking

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of special titanium dioxide for papermaking with high hiding power, comprising the following steps:

[0020] (1) Adjust the density of titanium dioxide slurry to 300g / l, raise the temperature to 80°C, add zirconium carbonate in an amount of 0.02% of the mass of titanium dioxide, and stir.

[0021] (2) Add aluminum sulfate solution to the slurry, the addition amount is 0.8% of the mass of titanium dioxide, the pH value of the slurry is 3.0, and then add sodium metaaluminate solution, the addition amount is 0.7% of the mass of titanium dioxide, after adding the slurry The pH value of the slurry is not more than 10, and finally the pH value of the slurry is adjusted to 7.0 with phosphoric acid, and matured for 30 minutes. At this time, the contents of aluminum oxide and phosphorus pentoxide added are respectively 1.5% and 1% of the total content of titanium dioxide;

[0022] (3) Repeat step 2.

[0023] (4) Repeat step 2 again.

[0024] (5) Add alumin...

Embodiment 2

[0039] (1) Adjust the density of titanium dioxide slurry to 315g / l, raise the temperature to 82°C, add zirconium carbonate in an amount of 0.02% of the mass of titanium dioxide, and stir.

[0040] (2) Add aluminum sulfate solution to the slurry, the addition amount is 0.8% of the mass of titanium dioxide, the pH value of the slurry is 3.2, and then add sodium metaaluminate solution, the addition amount is 0.7% of the mass of titanium dioxide, after adding the slurry The pH value of the slurry was 9.7, and finally the pH value of the slurry was adjusted to 7.1 with phosphoric acid, and aged for 30 minutes. At this time, the contents of aluminum oxide and phosphorus pentoxide added were respectively 1.5% and 1.1% of the total content of titanium dioxide;

[0041] (3) Repeat step 2.

[0042] (4) Repeat step 2 again.

[0043] (5) Add aluminum sulfate solution, the addition amount is 0.8% of the mass of titanium dioxide, the pH value of the slurry is 3.1, then add sodium metaalumi...

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Abstract

The invention discloses a preparation method of special high-covering-power titanium dioxide for papermaking. The method utilizes a coating temperature of 80 DEG C and two layers of coating films, wherein the first layer forms a layer of aluminum phosphate precipitates on the surface of titanium dioxide, and comprises the following steps: 1, adding aluminum sulfate, wherein the pH value of the slurry is 3, then adding sodium metaaluminate to enable the pH value of the slurry not to exceed 10, finally adjusting the pH value of the slurry to 7 with phosphoric acid, carrying out curing for 30 min, wherein the coated phosphorus content w(P2O5) is 1% and the coated aluminum content w(Al2O3) is 1.5%, and repeating the step three times, so that the coated aluminum phosphate is relatively compact,and 2, forming precipitates of aluminum hydroxide salt by adding a certain volume of an aluminum sulfate solution, then adding a sodium metaaluminate solution to adjust the pH value of the slurry to7, and carrying out curing for 1 hour. According to the method, the aluminum sulfate, the sodium metaaluminate and the phosphoric acid are added, and the phosphorus-aluminum highly-coated titanium dioxide is prepared through multiple coating operations, so that the finished product has the characteristics of high coverage and high whiteness.

Description

technical field [0001] The invention belongs to the technical field of producing titanium dioxide by a sulfuric acid method, and in particular relates to a preparation method of special titanium dioxide for papermaking with high hiding power. Background technique [0002] The paper industry is an important user of titanium dioxide. Titanium dioxide is used in decorative paper and banknotes. Paper using titanium dioxide has the advantages of high whiteness, high strength, good gloss, thin and smooth, and does not penetrate during printing. Under the same conditions, the opacity of paper is 10 times higher than that of calcium carbonate and talcum powder, and the quality can be reduced by 15% to 30%. [0003] The paper industry's requirements for the quality of titanium dioxide, in order of importance, are: hiding power (opacity) > whiteness > dispersibility > weather resistance > retention rate. [0004] At present, the commonly used titanium dioxide coating meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3653C09C1/3661C09C1/3692C09C3/006C09C3/06C09C3/063
Inventor 仝宇徐梦李达万莹王秀清宋代磊孙家祥
Owner JINAN YUXING CHEM
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