CS268351B1 - Titanium Dioxide Pigment and Titanium Dioxide Treated Alumina Oxide »and Oxide» Siliceous » - Google Patents

Abstract

New types of micronized titanium dioxide pigments with improved permeability and resistance based on titanium dioxide, treated alumina and silica, and untreated titanium dioxide, each containing by weight based on the weight of the pigment as a whole 4.7 to 49.7%, preferably 15 to 35% of treated titanium dioxide, 50 to 95%, preferably 65 to 85% of untreated titanium dioxide, 0.1 to 20%, preferably 0.5 to 5% of alumina or 0.1 to 20%. preferably 0.5 to 10% of silicon dioxide or mixtures thereof 2 > 1 to 5 t 1 or 1 « 1 to 1 t 5 or 0.1 to 20%, preferably 0.5 to 10% of alkaline earth aluminum and magnesium silicates and 0.1 to 3%, preferably 0.1 to 0.5% of polymethylhydrogenalloxane, or 0.1 to 3%, preferably 0.1 to 0.5% of triethanolamine, or mixtures thereof in a ratio of 1 to 2 to 1 I 5, or 0.1 to 3%, preferably 0.1 to 0.8% of acetate of the condensation product of etheric acid and ethanolamine, they are prepared by micronizing the treated titanium dioxide and the untreated calcined titanium dioxide together with the addition of inorganic additives. Such as alumina, silica, aluminum silicates, alkaline earth and magnesium silicates. Organic active substances are added before or during microfiltration.

Description

The invention relates to new types of micronized T1O ₂ β pigments with good resistance and dispersibility, which are prepared by joint micronization of treated and untreated T1O ₂ pigments (calcate) with addition of inorganic additives Al ₂ 0 ₃ , S1O ₂ , aluminum silicates, alkaline earths and magnesium and organic hydrophilic and hydrophobic active substances ·

In _{addition to optical properties, T10 2} ae pigments primarily require that they be resistant to weathering and work well - dispersed in various binder systems, plastics, paper and the like. This can only be achieved by surface treatment of T10 ₂ pigments with inorganic oxides or hydrates such as Al ₂ O ₃ , S10 ₂ , T1O ₂ , ZrOgf CoOg and additives of organic active substances.

The surface treatment of T1O ₂ pigment is a very demanding and expensive process. 3e double grinding is necessary, own surface treatment with considerable consumption of water and energy for drying, another unpleasant problem is aolnoet of wastewater.

For these reasons, the efforts of researchers involved in the development of titanium white to replace the demanding surface treatment process with a simpler technology. Partly this problem for dlspergovatelnosti solves DT-PS 2946 549, where Jo method for preparing a pigment Tioga common mlkronlzací untreated and treated pigments T10 ₂ · The thus prepared pigments T10 ₂ have EICO good dlepergovatelnost ala lower weather resistance than pigments _B finish. For these reasons, the micronization of treated TiO ₂ pigment and untreated calcined T 10 O with inorganic additives Al _{2 O 3, S 2} O 2, aluminum silicates, alkaline earth metals and magnesium with a high specific surface area in the presence of organic active substances with hydrophilic and hydrophobic character was tested. Surprisingly, it has been found that T10 ₂ pigments can be prepared in this way not only with good dispersibility but also with good resistance. At the same time, the theological properties of the pigment were improved and the sedimentability of the pigment during storage in the paint composition was reduced. The resulting sediment is again evenly dispersed in the paint by mixing.

Pigments with a higher content of 10 to 15% by weight can be obtained particularly easily in this way. ^α 1 · 2 ° 3 ⁸ Si ° 2 'which are well and advantageously processed into aqueous and disperse paints. The technological problem lies primarily in the accurate measurement of individual components before or during the micronization so that the micronized pigment corresponds to the specified composition ·

The essence of the invention lies in the fact that new types of micronized T1O ₂ pigments and good dispersibility and resistance have been prepared, characterized in that they are composed of 50 to 95% by weight of titanium oxide, preferably 65 to 85% and 65 to 85% by weight. and by weight from 4.7 to 49.7%, preferably 15 to 35% of treated titanium oxide, containing by weight 0.1 to 20%, preferably 0.5 to 5% of alumina and 0.1 to 20% by weight, preferably 0 , 5 to 10% of silica.

Furthermore, based on the pigment as a whole, 0.1 to 20%, preferably 0.5 to 5% by weight of alumina and 0.1 to 20%, preferably 0.5 to 10% by weight of silica are based on the pigment. Instead of alumina and silica, 0.1 to 20%, preferably 0.5 to 10% of aluminum, alkaline earth metal and magnesium silicates can be used. To improve the dispersibility, the new types of micronized pigments of titanium dioxide contain, depending on the use in the application of the hydrophilic or hydrophobic active substance, 0.1 to 3% by weight, preferably 0.1 to 0.5%, or mixtures thereof.

The invention also relates to a process for the preparation of these pigments, in which the treated pigment T1O ₂ and the untreated pigment T10 ₂ - calcinate are coronized together with the addition of inorganic additives Al ₂ O ₃ and S10 ₂ or mixtures thereof or aluminum, alkaline earth metal and magnesium silicates with by the addition of organic active substances which ae add before micronization or during micronization. The inorganic additives used must not reduce the optical properties of the T10 ₂ pigments, they must have a high specific surface area 1 and a specific resistance.

Sil Silicone compounds - polysiloxanes / polyhydrogenmethylslloxane, polydlmethylslloxane, polymethylsilylslloxane, polysilolylslloxane, polystylbenzylslloxane / have proved to be the best hydrophobic organic substances. Of the hydrophobic compounds, monoatanolamine, trlotanolamine, tripropanolamine and trisopropanololane are well suited. Of the compounds and the balanced polarity and hydrophobic-hydrophilic character, divalent polyethylene glycols with a molecular weight of 200 to 1000 and condensation products of aliphatic or aromatic amines and higher fatty acids or ethylene oxide were used.

The progress achieved by the invention consists mainly in the preparation of new types of micronized pigments T10 ₂ and with significantly lower energy consumption while maintaining good dispersibility and resistance to weathering.

Example 1 kg of rutell calcate and 20 kg of treated rutl white / 3% Al ₂ O ₃ , 1% S10 ₂ , 1% T10 ₂ / a and uniformly homogenized with the addition of 2.4 kg AlgO 3, 0.8 kg S10 ₂ and micronized under addition of 0.8 kg of polyethylene glycol (PEG). It receives aa universal pigment e 95.2% TiO ₂ .

Example 2

71.6 kg of rutell calcate and 15 kg of treated rutl white / 10% S10 ₂ and 5% Al ₂ O ₃ / are uniformly homogenized and by the addition of 8.5 kg S10 ₂ , 4.25 kg Al ₂ 0 ₃ , 0.15 kg polymethylhydrogenalloxane and 0.45 kg of trlethanolamine and micronized. Receives a universal pigment with 84.3% T10 ₂ ·

Example 3

Same as Example 1, except that ground PEG ae added 0.25 kg of polymethylhydrogonHexane and 0.75 kg of trletonolamine. Receives ae universal pigment and 95% T10 ₂ ·

Example 4

The same as Example 1 and with the difference that Al ₂ 0 ₃ and S10 ₂ ae thickeners add 3.2 kg of synthetic aluminum silicate.

Example 5

The same as Example 1 and with the difference that ground Al ₂ O ₃ and S _{10 2} aa add 3.2 kg of finely ground talc.

Example 6

Same as Example 1, except that 3.2 kg of synthetic calcium silicate was added _{instead of Al 2} O ₃ and S _{2 O 2.}

Example 7

Same as Example 1, except that 0.6 kg of trlethanolamine was added instead of PEG. Obtains ae apacelle pigment for aqueous medium and 95.4% T10 ₂ «

Example 8.

Same as Example 1 except that 0.5 kg of polymethylanhydroganslloxane was added instead of PEG. A special pigment for a hydrophobic environment with 95.5% T10 ₂ «is obtained

Example 9 t

Same as Example 1, except that ground PEG ae was added prior to micronization of Syntamln PA (acetate of the condensation product of stearic acid with ethanolamine). · A universal pigment with 95.2% of T10 _{2 was obtained} .

Tests of dispersibility and resistance to weathering were performed in a baking alkydomelamine term in an alkyd-melamine ratio of 3: 1. The paint was dispersed for 1 hour in an attritor and the friction was measured on a grindometer. After standing for 40 days, the coatings were applied to the test plates and fired for 30 minutes. at 120 ° C. Evaluation of resistance was performed in a Xenotest 450 weatherometer without ultraviolet

CS 268 351 Bl ₃ filters according to the Kempf method. The results obtained are shown in the following Table 1 with 2 reference samples of rutile white. .

Table 1

Example Type of pigment Data on grindomster / Um Resistance according to Ksmpfy / 5 / hour. 1 Universal rutile. pigment 13 85 2 Universal rutile. pigment 12 110 3 Universal rutile. pigment 10 87 4 Universal rutile. pigment 12 90 6 Universal rutile. pigment 13 86 Modified rutile white / 3% Al ₂ O ₃ , 1% SiO ₂ , 1% TiOg / 10 90 Modified rutile white / 5% A1 ₂ O ₃ , 9% S10 ₂ / 12 115

Samples prepared according to Examples 5, 7, 8 and 9 were not evaluated in the alkylaminamide term. .

Claims (2)

SUMMARY OF THE INVENTION A pigment based on titanium dioxide treated with alumina and silica and untreated titanium dioxide, characterized in that it contains, based on the weight of the pigment as a whole, AND/ 4.7 to 49.7% treated titanium dioxide, which in addition to titanium dioxide itself a / 0.1 to 20% alumina a b / 0.5 to 10% of silica, 8 / 50 to 95% titanium dioxide, c / o. i to 20% alumina or silica or mixtures thereof in a weight ratio of 2 t 1 to 5: 1 1 t 1 to 1 i 5 or aluminum, alkaline earth metal and magnesium silicates and or 0 / 0, 1 to 3% polymethylhydrogenslloxane or triothanolamine or mixtures thereof in a ratio of 1 t 2 to 1 t 5 or acetate of the condensation product of stearic acid s ethsnolsnin emž perceive these are always meant by weight. 2. A process for the preparation of nucleated titanium dioxide pigments according to claim 1, characterized in that the treated titanium dioxide and the untreated calcined titanium dioxide are coronized after the addition of alumina, quartz oxide, aluminum silicates, alkaline females and magnesium, the organic active substances being added before or during micronization.