SU1239137A1 - Method of modifying pigment titanium dioxide - Google Patents

Description

The invention relates to the production of titanium dioxide pigment, in particular, to the technology of its modification, and can be used in the paint industry.

The aim of the invention is to increase the weather resistance of a paint and varnish coating based on titanium dioxide pigment dioxide. , ...

Example 1. Preparation of pigment O is not added again 11.4 mp of solution of grade AO-1.

To 200 ml of an aqueous suspension of anatase titanium dioxide heated to 60 ° C containing 100 g / l of TiOj, is added

sodium silicate (70 g / l SiOg) per 4% SiO by weight of TiOg; stirred. 6.65 ml of aluminum dihydroxy sulfate solution (60 g / l

1.45 ml of NajSiO concentration (15) solution calculated for 2% A1jO к by weight of 70 g / l SiO per 0.5% TiO, is mixed. Neutralize with sus-Sipj to the mass of TiO, mix the pentium with 2.4 ml of soda solution (100 g / l, 20 min, add 3.33 ml of solution) to pH 4.5, mix, and condense the aluminum hydroxide sulfate with a concentration of 2 55 ml of a solution of sodium hydroxide with a solution of 60 g / l, calculated on 1% 20 (110 g / l NaOH) –to pH 6.5, mixed with AljO by weight of TiO, are mixed. 30 minutes, add 3.8 ml of soda solution with a concentration of 100 g / l to a pH of 4.5, stir 20 minutes. 2.8 ml of a solution of sodium hydroxide with a concentration of 100 g / l of NaOH are added to pH 6.5, stirred for 20 minutes. After that, the suspension is filtered on a funnel.

Buchner. Pasta repulp and again

- | C

The resulting pigment has the following parameters: BPQ content 0.45%; pH of the aqueous extract is 6.9; B - 96.0 used; PC - 1150 used; D in drying oil - 25 microns; Y - 55 content of titanium dioxide is 86.8%. Atmosphere resistance and, accordingly, PCA are similar to pigment

. filtered, dried at, 30 in example 1. smash rubbed. EXAMPLE 3. Preparation of pigment

The resulting pigment brand AO-1 brand P-02- has the following indicators: containing

water soluble salts (VRS) „„

p 107 / l. To 200 ml of aqueous suspension of rutile, 1U / s, disintegrating ability (PC), with / inn / Tin

- 35% titanium dioxide (100 g / l

add 2.3 MP sodium silicate solution (70 g / l SiO,) calculated on the 8% SiO-mass to TiO, mix. 6.25 ml of dihydroxosulfate 0 aluminum is added (60 g / l per 2% mass: TiOj is stirred, 1 ml of pacTBOpli sulfate U1H-ka (60 g / l ZnO) is added, calculated on 0.3% ZnO up to 7% of cracking, the surface of the TiO mass is stirred. Neutrality of the coating .45 application is carried out by 4 mp soda solution

(, 100 g / l) to pH 4.5 with 1,200 services. units, oil absorption (M) 30 g / 100 g of pigment, dispersibility in drying oil 13 µm, opacity (U) 35 g / m and contains 95% titanium dioxide. The coating based on this pigment does not change color in the absence of chalking, flaking and blistering for 18 months; at the same time, this pigment is observed in the coating compared to a similarly treated pigment using. aluminum sulphate has improved

the next 1 m by stirring, and then 2 ml of sodium hydroxide solution (100 g / l NaOH) to pH 6.8, followed by another 1 m stirring, and then 2 ml of sodium hydroxide solution (100 g / l NaOH) to pH 6.8 followed by phytotechnical activity (PCA) by 50 stirring. After performing the corre sponding on o / i), the general final operations, including the final stage 2. Preparation of pigment and filtration of the suspension, drying and

brands A-03.

Process temperature, duration

rubbing, the pigment has the following indications: HRV content of 0.22%; mixing and order of operations is 55 pH of the water solution 7,22; In the same as in example 1. 95.2 services. ed; PC - 1720 conventional units;

To 200 ml of an aqueous suspension of dioxy-M - 25 g / 100 g of pigment; D - 15 microns; yes titanium (100 g / l) add 10 ml U - 38 dioxide content

sodium silicate solution (70 g / l SiOg) calculated to 3.5% SiO to the mass of TiO; mix; add 8.33 ml of aluminum dihydroxy sulfate solution (60 g / l) to 2.5% AljjO to the mass Ti-Oj, mix, add 5.6 ml of soda solution (100 g / l) to pH 5.2, mix. In the second stage, modify as follows by stirring, and then 2 ml of sodium hydroxide solution (100 g / l NaOH) to pH 6.8, followed by stirring. After completing the corresponding1; general end operations, including 312391374

titanium 93.9%. Weatherability exceeds this indicator for a pigment similar to that of a pigment treated with the use of 1. PHA of the proposed pigment with aluminum sulphate, of the order of 65%.

Claims (1)

METHOD FOR MODIFICATION OF PIGMENT TITANIUM DIOXIDE, including treating it in an aqueous suspension with water-soluble silicon compounds. and aluminum when heated, introducing an alkaline agent into the suspension, then filtering it, rinsing, drying and microparticulating the pigment, characterized in that, in order to increase the weather resistance of the paint coating based on the target pigment, aluminum dihydrosulfate is fed for processing as an aluminum compound Al _z (0H) ₂ (S0 ₄ ) ₂ . '1239137 ¹