CN101186334A

CN101186334A - Method for preparing lightfastness titanium dioxide

Info

Publication number: CN101186334A
Application number: CNA2007101910235A
Authority: CN
Inventors: 姚恒平; 奉辉; 刘俊; 余婵婉
Original assignee: JIANGSU ZHENTAI CHEMICAL INDUSTRY Co Ltd
Current assignee: JIANGSU ZHENTAI CHEMICAL INDUSTRY Co Ltd
Priority date: 2007-12-06
Filing date: 2007-12-06
Publication date: 2008-05-28
Anticipated expiration: 2027-12-06
Also published as: CN100546917C

Abstract

The invention relates to a preparation method for producing titanium dioxide, and is used in such fields as decorative paper, etc., in particular relating to a preparation method for producing a light resistance titanium dioxide. The method includes the following steps: a. rutile titanium dioxide is added with deionized water and dispersant to prepare slurry, then the PH value of the slurry is regulated less than 4; b. zirconium salt solution is added with the weight being 0.3-1.5 percent of the weight of the titanium dioxide; c. alkali solution is added at 50-70 DEG C and the PH value is modulated to 7-8.5, then a compound of phosphorus is added with the weight being 1-2 percent of the weight of the titanium dioxide and the PH value is controlled at 8-10 while the temperature of the slurry is controlled at 60-80 DEG C; d. aluminum salt solution and corresponding neutralization reagent are added and the PH value is maintained at 8-10, and after curing, the needed titanium dioxide is achieved through filtration, washing, drying and smashing. The invention has the advantage of improving the retention of the titanium dioxide in the decorative paper and the light resistance of the decorative paper.

Description

The preparation method of lightfastness titanium dioxide

Technical field

The present invention relates to a kind of preparation method who is used for the titanium dioxide in fields such as decorative paper, specifically is a kind of preparation method of lightfastness titanium dioxide.

Background technology

Titanium dioxide is a kind of white pigment of performance brilliance, can be widely used in fields such as coating, plastics, papermaking, printing ink, catalyzer and the cosmetics of super quality.In paper industry, decorative paper is a titanium dioxide large usage quantity occasion, consumption can reach 20-45%, be widely used in decorative sheet, laminated flooring, office and furniture with surface lining etc., these occasions require must use to be had the weather resistance and the anti-xanthochromia ability titanium dioxide of getting well and processes, to satisfy the fast light heat-stable performance of decorative paper.

Surface treatment can change the surface property of titanium dioxide, covers the photoactivation point on titanium dioxide surface, stops titanium dioxide organism direct and in the dispersion medium to contact, to improve its weathering resistance.Common sial superpacket coating method is to add dispersion agent in tio_2 suspension, make slurry then at a certain temperature, mix with treatment agents such as water glass and sodium aluminates, regulate the pH value, make silicon oxide and precipitation of alumina in titanium dioxide particulate surface, filter then, wash, dry, the comminution by gas stream titanium dioxide product after obtaining coating.Because the SiO of product surface ₂The difficult control of the compactness extent of coating layer, its photostabilization of using in decorative paper also is affected.

Summary of the invention

Technical problem to be solved by this invention provides a kind of production that can be used in products such as decorative paper, have the preparation method of retention and sunproof lightfastness titanium dioxide preferably.

Method of the present invention may further comprise the steps successively:

A. use not surface treated sulfuric acid process Rutile type Titanium Dioxide, add deionized water and dispersion agent and make the slurry that concentration is about 200-300g/l, regulate below the pH value to 4;

B. add and account for titanium dioxide weight 0.3-1.5% (with ZrO ₂Meter) zirconium salt solution, operable zirconates has zirconyl sulfate, basic zirconium chloride etc., and preferred consumption is 0.5-1.0%;

C. under temperature is 50-70 ℃ condition, add alkali lye, regulate the pH value, the slaking regular hour, add and account for titanium dioxide weight 1-2% (with P to 7-8.5 ₂O ₅The compound of phosphorus meter), the available compound comprises phosphoric acid, Sodium hexametaphosphate 99 and phosphoric acid salt etc., preferred consumption is 1-1.5%, the slaking regular hour, regulate the pH value to 8-10, slurry temperature is controlled at 60-80 ℃;

D. add aluminum salt solution and corresponding neutralization reagent, keep the pH value at 8-10, aluminium salt can be selected sodium aluminate, Tai-Ace S 150 etc., and dosage is that the 3-6% of titanium dioxide weight is (with Al ₂O ₃Meter), adds the post curing certain hour, filter, wash, dry and pulverize and obtain required titanium dioxide.

The invention has the advantages that and to improve the retention of titanium dioxide in decorative paper and the photostabilization of decorative paper.

Embodiment

Embodiment one:

Get scattered concentration and be about slurry about 300g/l, add sulphur acid for adjusting pH value to 3, be warming up to 50 ℃, add and account for titanium dioxide 0.6% (with ZrO ₂Meter) zirconyl sulfate solution slowly adds the oxygen sodium hydroxide solution then and regulates slurry pH value to 8, slaking 30 minutes, and adding accounts for titanium dioxide 1.2% (with P again ₂O ₅Meter) sodium hexametaphosphate solution stirred slaking 20 minutes, readjusted slurry pH value to 9, and rising slurry temperature to 70 ℃ adds simultaneously and accounts for titanium dioxide 4% (with Al ₂O ₃Meter) sodium aluminate solution and dilute sulphuric acid, maintenances slurry pH value is 9-9.5, adds post curing 30 minutes, regulates pH value to 7, filters, washing, drying and pulverizing, obtains required titanium dioxide.

Embodiment two:

Get scattered concentration and be about slurry about 300g/l, add sulphur acid for adjusting pH value to 4, be warming up to 60 ℃, add and account for titanium dioxide 1.5% (with ZrO ₂Meter) zirconium oxychloride solution slowly adds the oxygen sodium hydroxide solution then and regulates slurry pH value to 7, slaking 30 minutes, and adding accounts for titanium dioxide 1% (with P again ₂O ₅Meter) phosphoric acid solution stirred slaking 20 minutes, readjusted slurry pH value to 8, and rising slurry temperature to 80 ℃ adds simultaneously and accounts for titanium dioxide 3% (with Al ₂O ₃Meter) sodium aluminate solution and dilute sulphuric acid, maintenances slurry pH value is 8-8.5, adds post curing 30 minutes, regulates pH value to 7, filters, washing, drying and pulverizing, obtains required titanium dioxide.

Embodiment three:

Get scattered concentration and be about slurry about 300g/l, add sulphur acid for adjusting pH value to 3, be warming up to 70 ℃, add and account for titanium dioxide 0.5% (with ZrO ₂Meter) zirconyl sulfate solution slowly adds the oxygen sodium hydroxide solution then and regulates slurry pH value to 8.5, slaking 30 minutes, and adding accounts for titanium dioxide 2% (with P again ₂O ₅Meter) sodium hexametaphosphate solution stirred slaking 20 minutes, readjusted slurry pH value to 9.5, and rising slurry temperature to 80 ℃ adds simultaneously and accounts for titanium dioxide 6% (with Al ₂O ₃Meter) sodium aluminate solution and dilute sulphuric acid, maintenances slurry pH value is 9.5-10, adds post curing 30 minutes, regulates pH value to 7, filters, washing, drying and pulverizing, obtains required titanium dioxide.

Comparative Examples:

Get scattered concentration and be about slurry about 300g/l, add sodium hydroxide and regulate pH value to 10, be warming up to 80 ℃, adding accounts for titanium dioxide 1% (with SiO ₂Meter) sodium silicate solution adds dilute sulphuric acid simultaneously, and the maintenance slurry pH value is 9.5-10, adds post curing 30 minutes, regulates slurry pH value to 8, adds to account for titanium dioxide 3% (with Al again ₂O ₃Meter) sodium aluminate solution and dilute sulphuric acid, maintenances slurry pH value is 8-8.5, adds post curing 30 minutes, regulates pH value to 7, filters, washing, drying and pulverizing, obtains required titanium dioxide.

Sample after getting 4g and pulverizing and 300g paper pulp filter and copy paper with after 400ml water high-speed stirring is mixed, and paper is dried, and the crucible calcination that places constant weight is calculated retention behind the measurement ash content.The retention of example 1-3 and Comparative Examples is as follows:

The paper of copying is put into ultraviolet accelerated deterioration instrument, is accelerated deterioration 5 hours under 70 ℃ the condition in temperature, and the colour-change Δ E that measures paper weighs the photostabilization of paper, and Δ E is little, and photostabilization is good.The Δ E data of example 1-3 and Comparative Examples are as follows:

This shows, adopt the inventive method that titanium dioxide is carried out surface treatment, can improve retention and the photostabilization of titanium dioxide in decorative paper.

Claims

1. the preparation method of a used for decorative paper lightfastness titanium dioxide, it is characterized in that: this method may further comprise the steps successively,

A. use not surface treated sulfuric acid process Rutile type Titanium Dioxide, add deionized water and dispersion agent and make the slurry that concentration is 200-300g/l, regulate below the pH value to 4;

B. add zirconium salt solution, the add-on of zirconates is with ZrO ₂Meter accounts for the 0.3-1.5% of titanium dioxide weight, in temperature is to add alkali lye under 50-70 ℃ the condition, regulates the pH value to 7-8.5, slaking;

C. the compound that adds phosphorus, the compound add-on of phosphorus is with P ₂O ₅Meter accounts for the 1-2% of titanium dioxide weight, after the slaking, regulates the pH value to 8-10, and slurry temperature is controlled at 60-80 ℃;

D. add aluminum salt solution and corresponding neutralization reagent, keep the pH value at 8-10, the add-on of aluminium salt is with Al ₂O ₃Meter accounts for the 3-6% of titanium dioxide weight, adds post curing, filters, washs, dry and pulverize and obtain required titanium dioxide.

2. the preparation method of used for decorative paper lightfastness titanium dioxide according to claim 1, it is characterized in that: described step a is, use not surface treated sulfuric acid process Rutile type Titanium Dioxide, add deionized water and dispersion agent and make the slurry that concentration is about 200-300g/l, regulate below the pH value to 3.

3. according to the preparation method of used for decorative paper lightfastness titanium dioxide according to claim 1, it is characterized in that: described step b is, adds zirconium salt solution, and the add-on of zirconates is with ZrO ₂Meter accounts for the 0.5-1.0% of titanium dioxide weight, in temperature is to add alkali lye under 50-60 ℃ the condition, regulates the pH value to 7-8.5, slaking.

4. according to the preparation method of used for decorative paper lightfastness titanium dioxide according to claim 1, it is characterized in that: described step c is, adds the compound of phosphorus, and the compound add-on of phosphorus is with P ₂O ₅Meter accounts for the 1-1.5% of titanium dioxide weight, after the slaking, regulates the pH value to 8-10, and slurry temperature is controlled at 70-80 ℃.

5. according to the preparation method according to claim 1 or 3 described used for decorative paper lightfastness titanium dioxides, it is characterized in that: the zirconates among the step b is zirconyl sulfate or basic zirconium chloride.

6. according to the preparation method according to claim 1 or 4 described used for decorative paper lightfastness titanium dioxides, it is characterized in that: the compound of the phosphorus among the step c is phosphoric acid or Sodium hexametaphosphate 99 or phosphoric acid salt.

7. according to the preparation method of used for decorative paper lightfastness titanium dioxide according to claim 1, it is characterized in that: the aluminium salt in the steps d is sodium aluminate or Tai-Ace S 150.