SU977421A1 - Composition for producing grey enamel coating - Google Patents

Description

(54) - MASS FOR GETTING A GRAY ENAMEL

COATINGS

The invention relates to compositions of gray enamel coatings and can be used as standard samples for calibration and adjustment of reflective densitometers. As standards for the latter, a set of neutral gray surfaces with optical densities in the range 0.03-2.5 is required. The composition for the enamel coating 1 is known, containing per 100 math. frit 5 ma.ch. clay and 0.2 ma.h. sodium chloride, and the Frit contains, wt%: St0243,7; 16.4; BjOj 2.8; NajAIF 12.2; CaO 6.6; TiO 1.9; ZnO 2.8; SbjOj 12, 0.3; , 0.9. The gray enamel coatings obtained from this recipe have a bluish tint, i.e. lack of neutron power, and low optical density. The closest is the composition of the mass to obtain a gray enamel coating C21 containing, in wt.%: clay 4.4-4.7 / pigment 39 0.5-3.5; TiOj 0.2-4.4; frit 87.7-94.6; moreover, the Frit contains, wt%: SiO 49, 59.3; 6.9-13.4, - CaO 0.1-2.4}, NajO 12.3-h3, 9; F 4.6-11.3; Al, O, 4.7-10.1. The disadvantage of this composition is the low optical density of the coating and the neutrality. The purpose of the invention is to increase the optical density of the coating and improve neutrality. The goal is achieved by the fact that the mass for obtaining a gray enamel coating, including a frit containing SiOj, A,,, CaO, F, clay and pigment, also contains magnesium sulfate, as a pigment contains a pigment based on, Mn (L, CojOj, , a frit additionally contains MgO, SrO, ZrO P the following ratio of components, wt.%: Frit 82.4-90; clay 3.3-5.4; pigment 4.5-14; magnesium sulfate 0.1-0, 3; moreover, the frit contains, in wt.%: SfOj 44.6-49; Al, 0, 8.4-9.3; NaoO 17-29.1; B „0. 5.811, 1; CaO 2.5-6 , 2; F "3.8-8.2; MgO 0.1-1.9; SrO 0.1-0.9; r02 0.1 .5.3 .. Table 1 presents the composition of frits. Frit obtained by melting tim charge consisting of sand feldspar, soda ash, sodium nitrate, borax.

cryolite, chalk, magnesium carbonates and. strontium, zirconium dioxide at 12501280 С with subsequent granulation of water. Mass grind wet LM method.

Table 2 shows the composition of the coating mass.

The resulting mass is applied to preliminarily primed samples, dried, and dried in muffle furnaces at 7 ° -8 ° C for.

Table 3 shows the properties of the coating obtained on the basis of the described masses.

46,246,7

Sio

8.8 17 6 11.0 6.1

8.2

1.9

Hgo

0.1

SrO

0.1

ZrOo

The proposed coatings can be used as neutral-gray high-density standard samples for testing and adjusting reflective densitometers.

The developed enamel coatings are technologically advanced, are characterized by high mechanical strength, low cost and, when used instead of the currently used standards of jammed glass, produce significant economic results. cue effect.

Table 1

49.0

44.6

9.3

8.4 29.1 17.0 5.8 10.7 2.5 6.0

3.8

7.8.

0.1

0.1

0.1

0.1

0.3

5.3

table 2

Pigment 1064

based on C,

MnOj, .CojOj. 4.5

Magnesium sulfate

Optimal temperature

with roasting760

Claims (1)

1. Enameling metalvv. K., 1962, pp. 1313-131. 2, USSR Author's Certificate in Application No. 2976652/33, cl. C 03 S 7/04, 1980.