SU796199A1 - Mass for making enamel coating on steel - Google Patents

Description

(54) MASS FOR GETTING ENAMEL COATING ON STEEL

The invention relates to a technique for producing brightly colored red silicate coatings on steel products for household purposes, gas equipment and building tiles. The composition of the pulp is known for producing an enamel coating on steel containing frit, clay and pigments 1. The disadvantage of this composition is a small limit of the stability of the color of the red coatings relative to their calcination temperature + 15 ° C. The closest to the proposed one is the composition of the mass 2 for obtaining an enamel coating on steel containing, in wt.%: Frit 86.2-89.1 ; clay 2.6-2.7; red selejadmium pigment 3.4-3.6; silica sol 438-7,68 boric anhydride 0.15-0.25, moreover, the frit contains, wt%: SJD 46.6-47.8; AljQj 4.4-5.8; NajO 18.5-22; B, O, 13.3-16.1; CaF, 2.8-31; Na.AIF 5.8-8.5; CaO 0.6-0.9; MgO 03-0.6, 5-1.5. This composition has a firing temperature of 760-. 820 ° C, thermal color stability +25 ° C, slip stability 168 hours. The purpose of the invention is to increase the thermal stability of the red color and increase the stability of the slip. This goal is achieved by the fact that the mass for producing an enamel coating on steel, including a frit containing SiO,, H 2 O, CaF, MgO, clay, red selenocadmium pigment, additionally contains carbonate strontium and magnesium sulphate, and the frit additionally contains MnO / j in the following ratio of components, wt.%: Frit 89.46-90.13; clay 5325, 72; red pigment pigment 4,204, 50; strontium carbonate 0.2-0.4; magnesium sulphate 0.08-0.12; and the frit contains, wt%: SiOi 45.80-47.56; ,, 430-5.77; 19.40-19.80; BjOj 14.43-15.80; CaF 2.99-4.90; Na-AIF 6.90-8.45; CaO 0.60-1.45; MgO 0300, 80; MnO, 0.25-0.50. In tab. 1 shows the specific compositions of the proposed mass. 379619 Specific formulations of the proposed frits are presented in table. 2 The following raw materials are used to cook the frit: sand, feldspar, soda ash, crystal borax, sodium chloride, fluorite, chalk, magnesium oxide, cryolite and pyrolusite. The cooking process is carried out at 1200-1250С for 1 h 35 min 1 h 40 min. The preparation of the mass is carried out by the method of wet grinding in a ball mill the components up to a fineness of 15-17 units. according to Lysenko. After grinding the mass in the form of a slurry is subjected to:. .

89,8089,4690,13

5,425,725,32

foxy

4,504,304,20

0,200,400,25

0,080,120,10

.:. 45, 801

19.65

14.95

.

table 2

J.

46.20

4.30

19.80

15.80

3.75

7.70

1.45

0.65

0.35 4 are heated (aging) for at least 24 hours with occasional stirring with a mechanical stirrer. Properties of the proposed formulations are presented in table. 3. The proposed composition allows to obtain brightly colored coatings of red color with a single application of a slip on the primed surface and is consistent with white titanium coatings during firing. The enamel slip on its basis has good covering properties and is stable in time. Table

Roasting temperature, ° С 760-820

Thermal color stability, ° С

Chemical resistance

by 4%

acetic acid,

mg / cm

Chemical resistance to water, mg / cm

Claims (2)

Slip Stability, Formula of the Invention Mass to obtain an enamel coating on steel, including a Frit, containing Sipi, N82.0, ,, CaRj,, CaO MgO, clay, red selenocadmium pygmite, characterized in that, in order to improve thermal stability the red color of the coating and higher stability of the slip, it additionally contains strontium carbonate and magnesium sulfate, and the frit additionally contains MnOj with the following ratio of components, wt.%: Frit89.46 - 90.13 Clay5.32 - 5.72 760-840 760-840 760-840 ± 25 ± 40 + 40 + 40 1,388 1,386 0.159 0.160 210 210 Red selenocadmium pigment4.20 - 4.50 Carbonic strontium0.2 - 0.4 Magnesium sulphate, 0.08 - 0.12, and frit contains, in wt.%: SiOa. 45.80-47.56; 4.3-5.77; 19.4-19.8; 14.43-15.8; SaG; 2.99-4.9; 6.9-8.45; CaO 0.6-1.45; MgO 0.3-0.8; MnOj 0.25-0.5. Sources of information taken into account in the examination 1. The author's certificate of the USSR N 533559, cl. From 03 to 7/04, 1974. 2. USSR author's certificate in application N 2438039/33, cl. From 03 to 7/04. 1977.