SU1384551A1 - Primer enamel - Google Patents

Abstract

The invention relates to silicate glasses, glazes, and enamels, which can be used to obtain an intermediate primer layer, which provides a strong fixation of coating enamels on steel when enameling parts of a gas apparatus, refrigerators, and dishes. The aim of the invention is to reduce the wetting angle at 840 ° C and to increase the adhesion strength. Glass for ground enamel contains, wt%: Cfg 30-46; 13.5-20.5; NajO 18-22; K, 0 2-3; LijO 1-2; CaO 8.8-12.0; SrO 1.5-2.5; NiO 0.6-1.8; CoO 0.4-1.2; MgO 0.5-2.0; TiO 1.2-2.8; 3.0-3.7. Soil enamel has a softening start temperature of 458-495 ° C, the firing temperature is 720-800 ° C, the firing interval is 660-880 ° C, spreadability at 54-97 mm, the wetting angle at 19-20 degrees, and adhesion strength 42-43.5 mNa. 2 tab. cl

Description

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113845

The invention relates to chemical compositions of silicate glasses, glazes and enamels, which can be used to obtain an intermediate primer layer that provides a strong fixation of coating enamels on steel when enameling parts of gas appliances, refrigerators, and cookware.

The purpose of the invention is to reduce the wetting angle while increasing the adhesion strength.

Table 1 shows the proposed formulations

Continued tabl, 1

Table 1

The temperature of the beginning of softening, С 500

Firing temperature

C800

Firing interval, (700-900 Flowability, 860 ° C,

mm

60

 frit is composed of technical 2Q raw materials. Bark

enamels are produced at 1200-1250 ° C.

Frit is milled in ball mills in a wet manner according to the following pick-up, May, h: 25 Granulated enamel 100.0 Clay, 6 часов hours

Fine ground quartz sand 10.0

30 Bura0,8

Sodium Nitrite 0.1 Water 48.0

The enamel is ground to a grinding fineness of 22-24 units, and the picnic is applied to the steel surface by known methods and burned in a wide temperature range for 2-6 minutes,

Table 2 shows enamel compositions and their properties.

table 2

840

481

66

495

760 800 680-860 720-880

54

Indicators

Wetting angle at, 2 min, hail.

Adhesion strength

MPa

The use of the proposed composition of enamel will allow refusing the introduction of surface-active substances for grinding, its wide use for enameling household household utensils and gas appliances, as well as improving the quality of enamelled products.

Claims (1)

Invention Formula Soil enamel, including SiO,,, KiO,, CaO, SrO, NiO, CoO, MgO, TiO, 2, characterized in that, in order to reduce the wetting angle when Continuation of table 2 nineteen 20 20 42.0 42.6 43.5 0 five 840 ° C and having an adhesion strength, it additionally contains VjOj in the following ratio of components, wt%: 0 Sio , Lijo Cao SrO Nio Coo MgO Tio V, 05 30-46 13.5-20.5 18-22 2-3 1-2 8.8-12.0 1.5-2.5 0.6-1.8 0.4-1.2 0.5-2.0 1.2-2.8 3.0-3.7