CN109266048B - Preparation process of low-viscosity and high-dispersity titanium dioxide slurry - Google Patents

Preparation process of low-viscosity and high-dispersity titanium dioxide slurry Download PDF

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CN109266048B
CN109266048B CN201811398067.XA CN201811398067A CN109266048B CN 109266048 B CN109266048 B CN 109266048B CN 201811398067 A CN201811398067 A CN 201811398067A CN 109266048 B CN109266048 B CN 109266048B
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titanium dioxide
slurry
viscosity
stirring
dispersing agent
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CN109266048A (en
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姜志刚
穆宇同
王建伟
刘立新
李冬旭
许丽岩
赵秀梅
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CITIC Titanium Industry Co Ltd
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    • 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
    • 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
    • C09C1/3669—Treatment with low-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C09C1/3676—Treatment with macro-molecular organic compounds
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    • 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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    • 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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    • 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
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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    • 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
    • C09C3/10—Treatment with macromolecular organic compounds

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  • Paper (AREA)

Abstract

A preparation process of titanium dioxide slurry with low viscosity and high dispersibility comprises the steps of adopting a rutile type titanium dioxide semi-finished product prepared by a chlorination method, pulping by deionized water to obtain a titanium dioxide slurry primary product with the mass concentration of 20-30%, and uniformly stirring; adding inorganic alkali liquor, adjusting the pH value of the slurry to 4.5-5.5, and uniformly stirring; adding water-soluble citric acid and sodium polycarboxylate composite solution as a dispersing agent, wherein the addition amount of the dispersing agent accounts for TiO20.2 to 0.5 percent of the weight is calculated, and the mixture is stirred evenly; and continuously adjusting the pH value of the slurry to 8.5-10.5 by using an inorganic alkali solution, and uniformly stirring to obtain the titanium dioxide slurry with low viscosity and high dispersibility. The advantages are that: the process is simple and reasonable, and the dispersed TiO can be improved in the water phase by changing the type of the dispersing agent and adjusting the pH value range of the dispersing agent2The effect is to reduce agglomeration and reduce the viscosity of the titanium dioxide slurry.

Description

Preparation process of low-viscosity and high-dispersity titanium dioxide slurry
Technical Field
The invention relates to a preparation process of titanium dioxide slurry with low viscosity and high dispersibility in the chemical field.
Background
Titanium dioxide is the best white pigment and is also an important chemical raw material, and is widely applied to the fields of coating, plastics, papermaking and the like due to excellent optical performance, stable chemical performance, high refractive index and good covering power, and the dispersion quality of titanium dioxide semi-finished product slurry directly influences the dispersion effect of a process product, the storage stability of a finished product, the use of a downstream product and related application performance.
With the continuous development of economy in China, the demand for titanium dioxide is continuously increased, as the world is the largest titanium dioxide producing country and titanium dioxide consuming country, the titanium dioxide industry in China is always the "rude type" of lead, and compared with the same industry in China, the titanium dioxide industry in China still has certain technical gaps, such as dispersion performance, particle size control, coating control, environmental protection treatment and the like. The dispersion problem of titanium dioxide is more prominent, for example, the semi-finished product of titanium dioxide is ground, and surface treatment is performed after the granularity is qualified, but titanium dioxide particles are often agglomerated together in the process, so that the product performance is greatly reduced.
Before the coating treatment of titanium dioxide, a dispersing agent is generally needed to disperse titanium dioxide slurry, and the conventional dispersing agent for dispersing the titanium dioxide slurry is a sodium hexametaphosphate solution.
Disclosure of Invention
The invention provides a preparation process of titanium dioxide slurry with low viscosity and high dispersibility for solving the problems of large dispersion viscosity and finished product dispersion effect of titanium dioxide semi-finished product slurry, and dispersed TiO can be improved in a water phase by changing the type of a dispersing agent and adjusting the pH value range of the dispersing agent2The effect is to reduce agglomeration and reduce the viscosity of the titanium dioxide slurry.
A preparation process of titanium dioxide slurry with low viscosity and high dispersibility comprises the following specific steps:
the method comprises the steps of pulping rutile type titanium dioxide semi-finished products prepared by a chlorination method by using deionized water to obtain titanium dioxide slurry primary products with the mass concentration of 20-30%, and stirring for 10-30 min;
adding inorganic alkali liquor, adjusting the pH value of the slurry to 4.5-5.5, and stirring for 10-20 min;
adding water-soluble citric acid and sodium polycarboxylate composite solution as a dispersing agent into the three, wherein the adding amount of the dispersing agent accounts for TiO20.2 to 0.5 percent of the weight, and stirring for 10 to 20 min;
and fourthly, continuously adjusting the pH value of the slurry to 8.5-10.5 by using an inorganic alkali solution, and stirring for 5-10 min to obtain the low-viscosity and high-dispersity titanium dioxide slurry, so that a high-quality material basis is provided for the chemical treatment of the next procedure.
Further, the inorganic alkali solution in the steps (2) and (4) is at least one of a sodium hydroxide solution and a potassium hydroxide solution.
Further, the mass concentration of the inorganic alkali solution in the steps (2) and (4) is 20-45%.
Further, in the step (3), the water-soluble citric acid and sodium polycarboxylate composite solution is prepared by mixing (5-10) of citric acid, 15-25) of sodium polycarboxylate and (65-80) of water in a mass ratio.
Compared with the prior art, the invention has the beneficial effects that:
the rutile type titanium dioxide semi-finished product slurry prepared by the chlorination method can improve the dispersion of TiO in the water phase by changing the type of the dispersant and adjusting the pH value range of the dispersant2The effect is to reduce agglomeration and reduce the viscosity of the titanium dioxide slurry, the viscosity is reduced by 35 to 60 percent compared with the viscosity of the sodium hexametaphosphate solution dispersed slurry, a high-quality material basis is provided for the chemical treatment of the next procedure, and the titanium dioxide slurry can be widely used in the post-treatment stage of the titanium dioxide production under the condition of ensuring the product quality.
Detailed Description
For a better understanding of the present invention, reference is made to the following examples.
Example 1
Pulping rutile type titanium dioxide semi-finished product prepared by chlorination with deionized water to obtain uniform titanium dioxide slurry primary product with mass concentration of 20%, stirring for 10min, adding sodium hydroxide alkaline solution with mass concentration of 20%, adjusting slurry to a specified pH value of 4.5, and stirring for 10 min; adding a water-soluble citric acid and sodium polycarboxylate composite solution as a dispersing agent, wherein the water-soluble citric acid and sodium polycarboxylate composite solution is prepared by mixing citric acid, sodium polycarboxylate and water in a mass ratio of 5:15:80, and the adding amount of the water-soluble citric acid and sodium polycarboxylate composite solution accounts for TiO2And the weight percent of the slurry is 0.2 percent, the slurry is stirred for 10min, the pH value of the slurry is continuously adjusted to 8.5 by using sodium hydroxide alkali liquor with the mass concentration of 20 percent, the slurry is stirred for 5min, and the viscosity of the slurry is detected to be 780mPa.s, so that a material basis is provided for the chemical treatment of the next working procedure.
Example 2
Adopting rutile type titanium dioxide semi-finished product prepared by chlorination method, using deionized water to make beating to obtain titanium dioxide whose mass concentration is 25% uniformStirring the slurry for 20min, adding 33% sodium hydroxide lye with the mass concentration, adjusting the pH value of the slurry to 5.0, stirring for 15min, adding a water-soluble citric acid and sodium polycarboxylate composite solution as a dispersing agent, wherein the water-soluble citric acid and sodium polycarboxylate composite solution is prepared by mixing citric acid, sodium polycarboxylate and water in a mass ratio of 10:25:65, and the adding amount accounts for TiO20.35 percent by weight, stirring for 15min, continuously adjusting the pH value of the slurry to 9.5 by using 33 percent by mass of sodium hydroxide alkali liquor, stirring for 7min, detecting the slurry with the viscosity of 450mPa.s, and providing a material basis for the chemical treatment of the next procedure.
Example 3
Pulping rutile type titanium dioxide semi-finished product prepared by adopting chlorination method by using deionized water to obtain uniform titanium dioxide slurry primary product with mass concentration of 30%, stirring for 30min, adding sodium hydroxide alkali liquor with mass concentration of 45%, adjusting slurry to specified pH value of 5.5, stirring for 20min, adding water-soluble citric acid and sodium polycarboxylate composite solution as dispersing agent, wherein the water-soluble citric acid and sodium polycarboxylate composite solution is prepared by mixing citric acid, sodium polycarboxylate and water in a mass ratio of 6:24:7, and the adding amount accounts for TiO2And the weight is 0.5 percent, the stirring is carried out for 20min, the pH value of the slurry is continuously adjusted to 10.5 by sodium hydroxide lye with the mass concentration of 45 percent, the stirring is carried out for 10min, and the slurry with the viscosity of 650mPa.s is detected, so that a material basis is provided for the chemical treatment of the next working procedure.
Comparative example 1
Pulping rutile type titanium dioxide semi-finished product prepared by chlorination with deionized water to obtain uniform titanium dioxide slurry primary product with mass concentration of 20%, stirring for 10min, adding sodium hydroxide alkaline solution with mass concentration of 20%, adjusting slurry to a specified pH value of 4.5, and stirring for 10 min; adding water-soluble sodium hexametaphosphate solution as dispersant, wherein the addition amount of the dispersant accounts for TiO2And the weight is 0.2 percent, the stirring is carried out for 10min, the pH value of the slurry is continuously adjusted to 8.5 by using sodium hydroxide alkali liquor with the mass concentration of 20 percent, the stirring is carried out for 5min, and the slurry with the viscosity of 1200mPa.s is detected, so that a material basis is provided for the chemical treatment of the next procedure.
Comparative example 2
The rutile type titanium dioxide semi-finished product prepared by the chlorination method,pulping with deionized water to obtain uniform titanium dioxide slurry with mass concentration of 25%, stirring for 20min, adding 33% sodium hydroxide alkaline solution, adjusting pH to 5.0, stirring for 15min, adding sodium hexametaphosphate solution as dispersant in TiO amount20.35 percent by weight, stirring for 15min, continuously adjusting the pH value of the slurry to 9.5 by using 33 percent by mass of sodium hydroxide alkali liquor, stirring for 7min, detecting the slurry with the viscosity of 1125mPa.s, and providing a material basis for the chemical treatment of the next working procedure.
Comparative example 3
Pulping rutile type titanium dioxide semi-finished product prepared by chlorination with deionized water to obtain uniform titanium dioxide slurry primary product with mass concentration of 24%, stirring for 22min, adding sodium hydroxide alkaline solution with mass concentration of 20%, adjusting slurry to specified pH4.5 value, and stirring for 17 min; adding water-soluble citric acid solution as dispersant, wherein the addition amount of the water-soluble citric acid solution accounts for TiO2And the weight percent of the slurry is 0.2 percent, the slurry is stirred for 14min, the pH value of the slurry is continuously adjusted to 8.5 by using sodium hydroxide lye with the mass concentration of 20 percent, the slurry is stirred for 8min, and the viscosity of the slurry is detected to be 820mPa.s, so that a material basis is provided for the chemical treatment of the next working procedure.
Comparative example 4
Pulping rutile type titanium dioxide semi-finished product prepared by chlorination with deionized water to obtain uniform titanium dioxide slurry primary product with mass concentration of 23%, stirring for 27min, adding sodium hydroxide alkaline solution with mass concentration of 20%, adjusting slurry to specified pH4.5 value, and stirring for 19 min; adding water-soluble sodium polycarboxylate solution as a dispersing agent, wherein the adding amount of the water-soluble sodium polycarboxylate solution accounts for TiO2And the weight percent of the slurry is 0.2 percent, the slurry is stirred for 17min, the pH value of the slurry is continuously adjusted to 8.5 by using sodium hydroxide alkali liquor with the mass concentration of 20 percent, the slurry is stirred for 6min, and the viscosity of the slurry is detected to be 855mPa.s, so that a material basis is provided for the chemical treatment of the next working procedure.
TABLE 1
Figure BDA0001875655560000031
Figure BDA0001875655560000041
As can be seen from the comparison of the product indices of examples 1 to 3 in Table 1: the correlation index and the application index of the three samples have little difference.
As can be seen from comparison results of comparative examples 1 and 2 and examples 1 and 2, the viscosity of the titanium dioxide semi-finished product slurry is obviously reduced by adopting the water-soluble citric acid and sodium polycarboxylate composite solution dispersant, the difference between the viscosity of the titanium dioxide semi-finished product slurry and the related indexes and application indexes of a sodium hexametaphosphate sample is very small, and the fineness of the samples of examples 1 to 3 is better than that of the comparative examples 1 and 2.
As can be seen from the comparison results of comparative examples 1-4 and examples 1-3, the viscosity of the titanium dioxide semi-finished product slurry is obviously reduced by adopting the water-soluble citric acid and sodium polycarboxylate composite solution dispersant, and the fineness of the samples in examples 1-3 is better than that in comparative examples 1-4.
Under the condition that the stirring form and the rotating speed of a wetting and pulping tank are completely the same, the viscosity of the slurry before sanding can be reduced to 60% of the original state at most by using the dispersing agent of the invention, while the lowest viscosity before sanding can only reach 1125mPa.s by using the conventional dispersing agent (comparative examples 1 and 2), the pH value of the dispersing agent of the invention is stabilized at about 9.50, the viscosity of the slurry is obviously reduced, the grain diameter of the slurry after sanding is obviously reduced, and a high-quality material basis is provided for the chemical treatment of the next procedure.
The above description is only exemplary of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A preparation process of titanium dioxide slurry with low viscosity and high dispersibility comprises the following specific steps:
the method comprises the steps of pulping rutile type titanium dioxide semi-finished products prepared by a chlorination method by using deionized water to obtain titanium dioxide slurry primary products with the mass concentration of 20-30%, and stirring for 10-30 min;
adding inorganic alkaline solution, adjusting the pH value of the slurry to 4.5-5.5, and stirring for 10-20 min;
adding water-soluble citric acid and sodium polycarboxylate composite solution as a dispersing agent into the three, wherein the adding amount of the dispersing agent accounts for TiO20.2 to 0.5 percent of the weight, and stirring for 10 to 20 min;
the water-soluble citric acid and sodium polycarboxylate composite solution is prepared by mixing (5-10) of citric acid, sodium polycarboxylate and water in a mass ratio of (15-25):
(65～80)；
and fourthly, continuously adjusting the pH value of the slurry to 8.5-10.5 by using an inorganic alkali solution, and stirring for 5-10 min to obtain the low-viscosity and high-dispersity titanium dioxide slurry.
2. The process for preparing a low-viscosity and high-dispersibility titanium dioxide slurry according to claim 1, wherein: in the steps (2) and (4), the inorganic alkali solution is at least one of a sodium hydroxide solution and a potassium hydroxide solution.
3. The process for preparing a low-viscosity and high-dispersibility titanium dioxide slurry according to claim 1, wherein: the mass concentration of the inorganic alkali solution in the steps (2) and (4) is 20-45%.
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