CN111040475A - Preparation method of special titanium dioxide with high covering power for papermaking - Google Patents
Preparation method of special titanium dioxide with high covering power for papermaking Download PDFInfo
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- CN111040475A CN111040475A CN201911226886.0A CN201911226886A CN111040475A CN 111040475 A CN111040475 A CN 111040475A CN 201911226886 A CN201911226886 A CN 201911226886A CN 111040475 A CN111040475 A CN 111040475A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3692—Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
Abstract
The invention discloses a preparation method of special titanium dioxide with high covering power for papermaking, which comprises the following steps: the coating temperature is 80 ℃, the coating is mainly divided into 2 layers, the first layer forms a layer of aluminum phosphate salt precipitate on the surface of titanium dioxide, the specific steps are adding aluminum sulfate, the pH value of slurry is 3, adding sodium metaaluminate to ensure that the pH value of the slurry is not more than 10, finally adjusting the pH value of the slurry to 7 by using phosphoric acid, curing for 30min, and the content of coated phosphorus and aluminum is w (P is P), respectively2O5）=1%，w（Al2O3) =1.5%, this step was repeated 3 times, so that the coated aluminum phosphate salt was denser. And secondly, forming aluminum hydroxide salt precipitate, firstly adding a certain volume of aluminum sulfate solution, then adding sodium metaaluminate solution to adjust the pH value of the slurry to 7, and curing for 1 hour. The method prepares the phosphorus-aluminum high-coating titanium dioxide by adding aluminum sulfate, sodium metaaluminate and phosphoric acid and simultaneously performing multiple coating operations, and the finished product has the characteristics of high coverage and high whiteness。
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production by a sulfuric acid method, and particularly relates to a preparation method of special titanium dioxide with high covering power for papermaking.
Background
The paper making industry is an important user of titanium dioxide, the titanium dioxide is used in decorative paper and paper money, and paper using the titanium dioxide has the advantages of high whiteness, high strength, good glossiness, thinness, smoothness and no penetration in printing. The opacity of the paper is 10 times higher than that of the paper added with calcium carbonate and talcum powder under the same condition, and the mass of the paper can be reduced by 15-30 percent.
The requirements of the paper making industry on the quality of the titanium dioxide are as follows according to the order of importance: covering power (opacity) > whiteness > dispersibility > weather resistance > retention.
At present, the commonly used titanium dioxide coating method is to obtain titanium dioxide after calcining metatitanic acid, to carry out wet milling, pulping and dispersing, then to carry out sanding treatment, then to add a coating agent into titanium dioxide slurry, to obtain titanium dioxide after drying and calcining. The coating method has multiple steps, long time, high energy consumption but not enough covering power, and also has the advantages of using the zirconia-alumina coating which can obviously mask the optical active group on the surface of the titanium dioxide lattice and reduce the photochemical activity of the titanium dioxide and does not influence TiO2The brightness and the color of the titanium pigment are beneficial to improving the durability and the dispersion performance of the titanium pigment. Thus, zirconia-alumina coated TiO2The product has higher glossiness, weather resistance and whiteness. However, the Zr-Al coating in China has complex process, complex operation, long production period and strict control of coating conditions. The main focus of the titanium dioxide for papermaking is on covering power and whiteness, so that the titanium dioxide for papermaking with high covering power is prepared.
Disclosure of Invention
In order to solve the problems, the invention provides a novel preparation method of the special titanium dioxide with high covering power for papermaking, and the titanium dioxide prepared by the method is obviously superior to the whiteness of the commercially available titanium dioxide, and has low energy consumption and high efficiency.
The invention is realized by the following technical scheme:
a preparation method of special titanium dioxide with high covering power for papermaking comprises the following steps:
(1) the density of the titanium dioxide slurry is 300-320g/l, and the temperature is raised to about 80 ℃; adding zirconium carbonate with the addition amount of 0.01-0.05% of the mass of the titanium dioxide, and stirring;
(2) adding aluminum sulfate solution into the slurry, wherein the adding amount is 0.8-0.9% of the mass of the titanium dioxide, the pH value of the slurry is 3.0-3.3, then adding sodium metaaluminate solution, the adding amount is 0.6-0.7% of the mass of the titanium dioxide, the pH value of the slurry after the adding is not more than 10, finally adjusting the pH value of the slurry to 6.8-7.2 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and phosphorus pentoxide is 1.4-1.5% and 1-1.1% of the total content of the titanium dioxide respectively;
(3) repeating the step (2) twice;
(4) adding aluminum sulfate solution with the addition amount of 0.8-0.9 percent of the mass of the titanium dioxide, adjusting the pH value of the slurry to 3.0-3.3, adding sodium metaaluminate solution to adjust the pH value of the slurry to 6.8-7.2, wherein the addition amount of the added sodium metaaluminate is about 0.6-0.7 percent of the mass of the titanium dioxide, curing for 1 hour, and finishing coating to prepare the special titanium dioxide for papermaking.
Preferably, the aluminum sulfate solution is 100g/l in terms of alumina content.
Preferably, the temperature of the coating in the steps (2) to (4) is 80-85 ℃.
In the invention, the coating amount of the obtained titanium dioxide is as follows: w (P)2O5）=3%，w（Al2O3) =6%, and the material after coating does not thixotropic when washed with water, and the finished product has good covering whiteness. The coating process comprises the following steps: the coating temperature is 80 ℃, the coating agent adopts diluted phosphoric acid, aluminum sulfate and sodium metaaluminate, the coating is mainly divided into 2 layers, the first layer forms a layer of aluminum phosphate salt precipitate on the surface of titanium dioxide, and the phosphorus and aluminum contents of the coating are about w (P) respectively2O5）= 3%，w（Al2O3) = 4.5%. The concrete steps are adding aluminum sulfate, the pH value of the slurry is 3, and then adding sodium metaaluminate to ensure that the pH value of the slurry is not higher than that of the slurryAdjusting pH to 7 with phosphoric acid, aging for 30min to obtain coated P-Al content of about w (P)2O5）=1%，w（Al2O3) =1.5%, this step was repeated 3 times, so that the coated aluminum phosphate salt was denser. And secondly, forming aluminum hydroxide salt precipitate, firstly adding a certain volume of aluminum sulfate solution, then adding sodium metaaluminate solution to adjust the pH value of the slurry to 6.8-7.2, and curing for 1 hour.
Advantageous effects
The invention provides a preparation method of special titanium dioxide with high covering power for papermaking, which is characterized in that aluminum sulfate, sodium metaaluminate and phosphoric acid are added, and the phosphorus-aluminum high-coating titanium dioxide is prepared through multiple coating operations, and the finished product has the characteristics of high covering power and high whiteness.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
A preparation method of special titanium dioxide with high covering power for papermaking comprises the following steps:
(1) adjusting the density of the titanium dioxide slurry to 300g/l, heating to 80 ℃, adding zirconium carbonate with the addition amount of 0.02 percent of the mass of the titanium dioxide, and stirring.
(2) Adding an aluminum sulfate solution into the slurry, wherein the adding amount of the aluminum sulfate solution is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.0, then adding a sodium metaaluminate solution, the adding amount of the sodium metaaluminate solution is 0.7 percent of the mass of the titanium dioxide, the pH value of the slurry after the adding is not more than 10, finally adjusting the pH value of the slurry to 7.0 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and the content of the added phosphorus pentoxide are respectively 1.5 percent and 1 percent of the total content of the titanium dioxide;
(3) and (5) repeating the step (2).
(4) Repeat step 2 again.
(5) Adding aluminum sulfate solution with the addition amount of 0.8 percent of the mass of the titanium dioxide, adding sodium metaaluminate solution with the pH value of 3.0 to adjust the pH value of the slurry to 7.0, wherein the addition amount of the sodium metaaluminate solution is about 0.7 percent of the mass of the titanium dioxide, curing for 1 hour, and finishing coating to prepare the special titanium white 1 for papermaking. The amount of the outer layer of alumina was 1.5% of the total amount of titanium dioxide. The materials after coating are fully washed without thixotropic phenomenon. Elemental analysis and particle size distribution and whiteness test conditions by grinding after drying.
Elemental analysis is given in the table below
TABLE 1 elemental analysis of high-coverage titanium dioxide for papermaking
It can be seen from table 1 that the amount of phosphorus and aluminum coating both reached the expected amounts.
(1) In the particle size distribution of the titanium dioxide coated at this time, d (0.5) =0.401um, the distribution pattern is basically normal distribution, and the particle size is similar to that of the most popular product in the market (d (0.5) is 0.4 um).
(2) Comparison of Dry powder whiteness with market products
As shown in Table 2, the whiteness of the titanium dioxide dry powder prepared by the method is slightly higher than that of the products popular in the market.
TABLE 2 Dry powder whiteness contrast table
(3) Comparison of hiding power with market products
TABLE 3 Dry powder whiteness degree comparison table
As shown in Table 3, the covering power of the titanium pigment for papermaking 1 prepared by the method is higher than that of the commercially popular product.
Example 2
(1) Adjusting the density of the titanium dioxide slurry to 315g/l, heating to 82 ℃, adding zirconium carbonate, wherein the adding amount is 0.02 percent of the mass of the titanium dioxide, and stirring.
(2) Adding an aluminum sulfate solution into the slurry, wherein the adding amount of the aluminum sulfate solution is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.2, then adding a sodium metaaluminate solution, the adding amount of the sodium metaaluminate solution is 0.7 percent of the mass of the titanium dioxide, the pH value of the slurry after the adding is 9.7, finally adjusting the pH value of the slurry to 7.1 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and the content of the added phosphorus pentoxide are respectively 1.5 percent and 1.1 percent of the total content of the titanium dioxide;
(3) and (5) repeating the step (2).
(4) Repeat step 2 again.
(5) Adding aluminum sulfate solution, wherein the adding amount is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.1, then adding sodium metaaluminate solution to adjust the pH value of the slurry to 7.0, the adding amount of the sodium metaaluminate is about 0.8 percent of the mass of the titanium dioxide, curing for 1 hour, finishing coating, and preparing the titanium dioxide 2 for high-covering paper making. The materials after coating are fully washed without thixotropic phenomenon. The elemental analysis and particle size distribution and whiteness tests performed by grinding after drying were as follows:
TABLE 4 elemental analysis of high-coverage titanium dioxide for papermaking 2
TABLE 5 Dry powder whiteness contrast table
TABLE 6 Dry powder whiteness contrast table
The high-covering-power papermaking titanium dioxide 2 has good covering power and whiteness.
Comparative example 1
The preparation method of the titanium dioxide only coated with one layer of phosphor-aluminum comprises the following steps:
(1) adjusting the density of the titanium dioxide slurry to 300g/l, heating to 80 ℃, adding zirconium carbonate with the addition amount of 0.02 percent of the mass of the titanium dioxide, and stirring.
(2) Adding an aluminum sulfate solution into the slurry, wherein the adding amount of the aluminum sulfate solution is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.0, then adding a sodium metaaluminate solution, the adding amount of the sodium metaaluminate solution is 0.7 percent of the mass of the titanium dioxide, the pH value of the slurry after the adding is not more than 10, finally adjusting the pH value of the slurry to 7.0 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and the content of the added phosphorus pentoxide are respectively 1.5 percent and 1 percent of the total content of the titanium dioxide;
(3) and (5) repeating the step (2).
(4) And repeating the step 2, prolonging the curing time to 1 hour, and finishing the coating. At this time w (P)2O5）=3%，w（Al2O3) And =4.5%, the materials are fully washed after being coated, the thixotropic phenomenon of the washed materials is very serious, and the filter pressing operation of three washing plate frames cannot be carried out in a workshop.
Comparative example 2
Low phosphorus aluminum coating (w (P)2O5）=2%，w（Al2O3) = 4.5%) titanium dioxide preparation method:
(1) adjusting the density of the titanium dioxide slurry to 300g/l, and heating to 80 ℃;
(2) adding an aluminum sulfate solution into the slurry, wherein the adding amount of the aluminum sulfate solution is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.1, then adding a sodium metaaluminate solution, the adding amount of the sodium metaaluminate solution is 0.7 percent of the mass of the titanium dioxide, the pH value of the slurry after the adding is 9.7, finally adjusting the pH value of the slurry to 7.0 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and the content of the added phosphorus pentoxide are respectively 1.5 percent and 1.0 percent of the total content of the titanium dioxide;
(3) and (5) repeating the step (2).
(4) Repeat step 2 again.
(5) Adding aluminum sulfate solution, wherein the adding amount is 0.8 percent of the mass of the titanium dioxide, the pH value of the slurry is 3.2, then adding sodium metaaluminate solution to adjust the pH value of the slurry to 7.0, the adding amount of the sodium metaaluminate is about 0.8 percent of the mass of the titanium dioxide, curing for 1 hour, and finishing coating. The materials after coating are fully washed without thixotropic phenomenon. And drying and grinding the washed materials to obtain the low-phosphorus-aluminum coated titanium dioxide, and performing application test analysis on the other materials to obtain the titanium dioxide with the whiteness and the covering power lower than those of the high-covering-power papermaking titanium dioxide 1 and 2.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A preparation method of special titanium dioxide with high covering power for papermaking is characterized by comprising the following steps:
(1) the density of the titanium dioxide slurry is 300-320g/l, and the temperature is raised to about 80 ℃; adding zirconium carbonate with the addition amount of 0.01-0.05% of the mass of the titanium dioxide, and stirring;
(2) adding aluminum sulfate solution into the slurry, wherein the adding amount is 0.8-0.9% of the mass of the titanium dioxide, the pH value of the slurry is 3.0-3.3, then adding sodium metaaluminate solution, the adding amount is 0.6-0.7% of the mass of the titanium dioxide, the pH value of the slurry is not more than 10, finally adjusting the pH value of the slurry to be 6.8-7.2 by using phosphoric acid, and curing for 30min, wherein the content of the added aluminum oxide and phosphorus pentoxide is 1.4-1.5% and 1-1.1% of the total content of the titanium dioxide respectively;
(3) repeating the step (2) twice;
(4) adding aluminum sulfate solution with the addition amount of 0.8-0.9% of the mass of the titanium dioxide, adjusting the pH value of the slurry to be 3.0-3.3, adding sodium metaaluminate solution with the addition amount of 0.6-0.7% of the mass of the titanium dioxide, adjusting the pH value of the slurry to be 6.8-7.2, curing for 1 hour, and finishing coating to prepare the special titanium dioxide for papermaking.
2. The method according to claim 1, wherein the aluminum sulfate solution is 100g/l in terms of alumina content.
3. The method according to claim 1, wherein the coating temperature in the steps (2) to (4) is 80 to 85 ℃.
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| CN109762372A (en) * | 2019-03-01 | 2019-05-17 | 河南佰利联新材料有限公司 | A kind of preparation method improving titanium dioxide weatherability |
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2019
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| CN104194409A (en) * | 2014-08-13 | 2014-12-10 | 攀钢集团钛业有限责任公司 | High-temperature-resistant titanium white, and preparation method and application thereof |
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Application publication date: 20200421 |