SU1595863A1 - Method of producing iron glaze - Google Patents

Abstract

The invention relates to the technology for producing iron-blue used in the manufacture of pigments and which allows improving the hiding power and moisture absorption of the product. Powdered calcium carbonate in the amount of 83-99g per 100 g of iron blue is added to the aqueous solution of iron sulfate. Alkali metal or ammonium ferrocyanide solution is added. The resulting suspension is heated to 60-70 ° C and oxidized with hydrogen peroxide. The precipitate is washed with water, filtered and dried. Before filtration, the suspension can be treated with 1-5% aqueous emulsion of synthetic C 17-C 20 fatty acids at 70-80 ° C. The hiding power of the resulting pigment is 2.69-5.10 g / m 2, oil absorption 28.8-33.5 g / 100g, moisture absorption 1.1-1.6%. 2 hp ff, 2 tab.

Description

The invention relates to the production of inorganic pigments, namely, to the production of iron blue — a blue pigment used for the manufacture of paints and varnishes, plastics, building and finishing materials.

The aim of the invention is to improve the opacity and moisture absorption of the product.

Example 1. In a 1 liter beaker, 210 ml of iron (II) sulphate solution with a concentration of 50 g / l is poured, 90 g of pulverized calcium carbonate with a particle size of 0.3-3 microns are added. The resulting suspension is heated to 50 and 274 mp solution of potassium ferrocyanide with a concentration of 50 g / l for 10-15 minutes with stirring. The suspension is stirred at 60-70 ° C for .1 h and 68 ml of a 15% hydrogen peroxide solution are added to it within 15-20 minutes. The precipitate is washed with water to remove water-soluble impurities, diluted with water to the ratio, 50 ml of 3% emulsion of synthetic fatty acids in water is added to the resulting suspension, heated to 70g-80 ° C and kept for 30 minutes with stirring, after which the product filtered and dried.

A pigment of the composition, wt.h-dye, is obtained from iron ferrocyants: leza and potassium 10; FFA 1.35; carbonate: calcium 88.65, calculated on the dry matter.

ate

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Hiding power, oil absorption, moisture absorption, reflection coefficient are determined.

B.tabl. 1 shows the conditions for the preparation of the prototype pigment, the pigments obtained by mechanical cm: alloying of the iron blue with calcium carbonate, and the pigments obtained by the j proposed method.

I The properties of the pigments obtained by different methods are described in Table. 2

Comparative analysis of data table. 1, 2 allows us to conclude that the mechanical mixing of iron iron obtained by a known method with fine carbonate does not give a positive effect (the indicators of the prototype are better than those of the mixture).

The introduction of calcium carbonate in the reaction mixture in an amount of 83-99 wt.% - allows you to adjust the pigment shades in the range of 27-80% of. the intensity of the reflected light, opacity in the range of 2.5 -. 9.6 g / m, oil absorption remains at the level of 48-52 g / 100 g, moisture absorption is quite high, 2.6-8.1%. The lower limit of the carbonate content, and atsi, in the pigment H3%, is due to the constant intensity of reflection at the dominant wavelength of light with a decrease in the CaCO3 content in the pigment. The upper limit of 99% - the deterioration of coverage. Pigment treatment; FLC emulsion allows to reduce water absorption by up to 1.1-1.6% while maintaining the viscosity at the same level; oil absorption of pigments also improves. The lower limit of the emulsion concentration

SZhK. 10 g / l is due to the stability of the emulsion, with an increase in the concentration of FFA in an emulsion above 50 g / l, the moisture absorption of the pigment is somewhat worse. As follows from the table. 2, the opacity of the pigment obtained by the proposed method varies within 2.69-5.10 g / m, which significantly exceeds this indicator of the pigment obtained by a known method (21 g / m). Oil absorption decreases to 28.8-33.5 g / 100 g vs. 59.1 g / / 100 g, moisture absorption decreases to 1.1-1.6% compared to 31.1% by a known method.

Claims (3)

1. A method of producing iron la-ri, which includes mixing aqueous solutions of iron (II) sulfate and alkali metal or ammonium ferrocyne, heating and oxidizing the crawling suspension, washing, filtering and drying the product, in order to improve the saturation, previously, powdered calcium carbonate in the amount of 83-99 g per 100 g of iron blue is added to the solution of ferrous sulfate, 2. The method according to claim 1 is different from the fact that oxidation is carried out with hydrogen peroxide. 3. Method according to paragraphs. 1 and 2, about the fact that, in order to reduce the moisture content of the product, the resulting suspension. Before filtration, treat with 1–5% aqueous emus / synthetic synthetic fatty acid, at 70–8 { f with. oh oh 05 g about t in 1 tM about hL vt -ti - about oh. about ON oh oh  sh about oh oh in in about 1L G cm | . about about about about g about trt about 1L -o t iri gfM about 4t in r m about 1L G um ok about vt in g about - about in g tM 00 oh oh 1L CHO vt I - about G- about 0 I- w in “What W with ( with sh with IN in -r G- eat I m with I s with 00 I § I I t II oo oo about in1P - - about “ , I eI "9 & "S 7: S X 1 § ° 5s s: w I o G o V j Sri to o U, about ffv SGP ate oh oh about "Have about st P OO g 00 Ltd -and n in oh oh uhh Ltd School Ltd  Sh Ltd 00 GM yu about 00 Mr.-in w o I I I sh SG | about% SP about . Iel -O1 S and & 0. .by g “With about S m with and.; h 3 about 41 (. S rs gp e; gg with n