RU2409606C2 - Heat resistant paint for electrode marking - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: heat resistant paint for electrode marking contains graphite at amount of 91.0-93.0 wt %, zinc oxide at amount of 6.8-8.8 wt %, hydrochloric acid - 0.08-0.14 wt %, ethyl alcohol - 0.06-0.10 wt % and tri-ethylen-glycol at amount of 0.005-0.015 wt %.

EFFECT: heat resistant paint for electrode marking possesses high adhesion properties and resistance to abrasion; it has sharp image of black colour with metallic shine on electrode coating of various colour gamma, long shelf life and low consumption rate.

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Description

The invention relates to the field of metallurgy, in particular to heat-resistant paints that can withstand high temperatures, and can be used in the manufacture of welding electrodes for their marking.

Known heat-resistant paint for marking electrodes, containing the following components in their ratio, wt.%: Pigment red iron oxide 63,0-66,0; zinc oxide 5.44-6.47; iron trichloride 6-water 28.5-30.5; ethyl alcohol 0.02-0.04; triethylene glycol 0.01-0.02 (Patent RU No. 2340643, C09D 5/18, publ. 2008.12.10).

The closest to the proposed paint and selected as a prototype is a heat-resistant paint for marking electrodes, containing the following components, wt.%: Pigment red iron oxide 91,0-93,0; zinc oxide 6.8-8.8; hydrochloric acid 0.05-0.10; ethyl alcohol 0.04-0.10; triethylene glycol 0.01-0.03 (Application RU 2007119529, C09D 5/18, published on November 27, 2007, bull. No. 33).

These paints meet all the requirements for paints for marking electrodes. However, the use in the compositions of electrode coatings of new materials, such as manganese ore, iron oxide, etc., staining the coatings in pink or red, do not allow for clearly distinguishable marking, since these colors are bright red.

The objective of the present invention is to develop a heat-resistant ink for marking electrodes, with high adhesive properties and withstanding temperatures up to 400 ° C, with obtaining a high-quality print on marked electrodes having different coating colors.

The problem is solved in that the heat-resistant paint for marking the electrodes, containing zinc oxide, hydrochloric acid, ethyl alcohol and triethylene glycol, according to the invention additionally contains graphite in the following ratio, wt.%:

graphite 91.0-93.0 zinc oxide 6.8-8.8 hydrochloric acid 0.08-0.14 ethanol 0.06-0.10 triethylene glycol 0.005-0.015,

while graphite has a particle size of not more than 315 microns.

A new technical result achieved by the implementation of the developed composition is that the introduction of graphite in the composition of heat-resistant paint provides the necessary color solution and does not adversely affect the welding and technological properties due to the fact that graphite has properties such as metallic luster and high electrical conductivity. And when graphite interacts with other components, heat-resistant paint acquires uniformity in its composition and color, is easily applied to electrode coatings at ambient temperatures from +15 to + 35 ° C and is capable of long-term storage. When dried, the paint can be diluted with water, which not only reduces its consumption, but also significantly prolongs its use. Also, the use of this paint allows to reduce the ink consumption per ton of electrodes from 0.066 kg to 0.062 kg (for electrodes of the UONI-13/55 brand) in comparison with the prototype, which has the lowest consumption of Russian paints for marking electrodes. After calcination, the applied paint is resistant to weathering, has high adhesive properties and abrasion resistance, has a clear black image with a metallic sheen on electrode coatings of various colors.

The above technical result is ensured by the fact that:

- heat-resistant ink, containing 91.0-93.0% graphite with a particle size of not more than 315 microns, allows you to get a stable print when marking the electrodes and, after calcining them, maintain the sharpness of the image. With values of more than 93.0%, the paint becomes thick, after calcination, paint is chalked on the surface of the electrodes, and with values of less than 91.0%, the required image brightness is not achieved;

- zinc oxide in the paint in the amount of 6.8-8.8% is a hardener.

- hydrochloric acid in an amount of 0.08-0.14% in the composition of heat-resistant paint helps to dissolve the components of the paint until a homogeneous mass;

- the introduction of ethyl alcohol in an amount of 0.06-0.10% and triethylene glycol in an amount of 0.005-0.015% is necessary for quick drying of the paint on the surface of the marked electrodes and ensuring the adhesion strength of two dissimilar surfaces, i.e., paint with an electrode.

Implementation of the proposed heat-resistant paint for marking electrodes was carried out in the workshop for the production of pipes and electrodes of OJSC "West Siberian Metallurgical Plant".

Heat-resistant paint (example No. 2 of the table) was prepared as follows. At first 0.11 wt.% (134 ml) of hydrochloric acid was poured into a metal container, 92.2 wt.% (184.4 g) of graphite was added with particle sizes not exceeding 315 μm and 7.6 wt.% (15.2 g) zinc oxide, then ethanol was added in an amount of 0.08 wt.% (204 ml) and triethylene glycol in an amount of 0.01 wt.% (18 ml) and then the resulting composition was thoroughly mixed. After that, the composition was kept for 24 hours for the reaction to proceed between the components. Then, using a marking device consisting of transfer rollers and a marking roller, marking with heat-resistant paint was applied on the surface of the welding electrodes (for example, UONI 13/55). Then the electrodes were dried and calcined at temperatures of 20 ° C and 400 ° C, respectively.

The composition of heat-resistant paint and the results of the marking on the electrodes are presented in the table.

The table shows that the marking on the surface of the welding electrodes according to examples 1-3 with the claimed quantitative values of the components of the specified composition was of good quality: high adhesive properties, a clear, readable print and a black image with a metallic sheen. The weather resistance of the ink was estimated by the number of wetting and drying cycles of the electrode coating, in which the print is easy to read. Humidification was carried out up to twice the normalized moisture content in the coating. For example, for electrodes of the UONI 13/55 brand, the moisture content in the coating increased from 0.2 to 0.4%. In addition, the marking with this paint withstood calcination at a temperature of 400 ° C, after which the exfoliation of the paint did not occur. When the quantitative content of the paint components was lower and higher than the limit values in Examples 4 and 5, the marking roller was clogged with paint and, as a result, it was unevenly applied to the marked electrodes, pale, hard to read and smeared prints.

The use of the inventive heat-resistant paint for marking electrodes provides high adhesive properties, a clear inscription, bright color, resistance to temperatures up to 400 ° C and allows to extend its use. In addition, heat-resistant paint is simple in technology for its manufacture and application to marked electrodes.

Claims (1)

Heat-resistant paint for marking electrodes containing zinc oxide, hydrochloric acid, ethyl alcohol and triethylene glycol, characterized in that it additionally contains graphite in the following ratio, wt.%:
graphite 91.0-93.0 zinc oxide 6.8-8.8 hydrochloric acid 0.08-0.14 ethanol 0.06-0.10 triethylene glycol 0.005-0.015,
while graphite has a particle size of not more than 315 microns.