SU1514457A1 - Composition of parting coating for pattern-core equipment - Google Patents

Description

The invention relates to foundry and can be used in the manufacture of molds and cores from mixtures based on modified technical lignosulfo. The invention relates to foundry, in particular for the manufacture of molds and cores, raw materials from mixtures based on modified technical lignosulfonates.

The purpose of the invention is to increase the resistance of the coating.

As part of the release coating, non-saponous hydrocarbons are used, which are obtained in the process of liquidation of the Progress liquid detergent, which are a dark-brown liquid with a specific smell, having a density of

2

natov. The purpose of the invention is to increase the resistance of the coating. This is achieved due to the fact that the composition of the release coating contains unsaturated carbons as a hydrophobic carbon-containing material in the production of detergent Progress, and also additionally contains coG

Apsok is a by-product of alkaline refining of fats and oils and silver graphite with the following ratio of ingredients, May. nevyrymy hydrocarbons in the production of detergent Progress 5-15; soap stock is a by-product of alkaline refining of fats and oils 35–45 silver-graphite 5–15; kerosene else. The release coating of such a composition forms a uniform, durable film on the surface of the snap-in, which allows for the number of removals between treatments 22-54 times.

2 tab.

0.75 - 0.55 g / cm ³ and the initial boiling point is not lower than 65 ° C.

Soapstock - a by-product of alkaline refining of fats and oils - is characterized by the following indicators: color - from light brown to dark brown, consistency at 20 ° C - from liquid to mazoobrazny, smell - specific, typical of soap stock, obtained from various oils and fats; a slight smell of decomposition of organic matter products is allowed: total fat content, 7 not less than 25-30 ·, content

$ 11 ,,,, 1514457 A1

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1514457

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fatty acids, 7, not less than 15. Common fats include neutral fat and fatty acids bound in the form of sodium salts. five

Soap stock is a biologically mild substance that does not adversely affect the environment. Its functional role in the separation coating lies in the fact that it, being distributed over the surface of the snap, prevents the penetration of water molecules and other polar groups of the binder to the snap. Reducing the presence of water on the hydrophilic surface of the section reduces the adhesion of the surface of the core and molding compounds to the aluminum tooling.

Example. For the preparation of 20 coatings on the proposed technical solution used unsaponifiable hydrocarbons with a density of 0.78 g / cm ⁵ ; soap stock; spirits from the second unsaponable; silver graphite (GOST 5279-25

74); lighting kerosene (GOST 4753-65).

The procedure for the preparation of the proposed separation of the following. thirty

Initially, 45 May. 7 soapstock is distributed at 35 May. 7 kerosene, then injected 5 May. 7 unsaponifiable hydrocarbons and 15 May.2! silver graphite and stirred until a homogeneous solution.

Similarly, five proposed formulations were prepared.

In tab. 1 shows the proposed coating compositions 1-5.

The release coating has the ability to form a uniform, durable film on the surface of the tooling, which allows you to achieve the required number of removals while ensuring good surface quality of the molds and cores.

The coating is applied to the snap-in of known methods, for example, with a brush, cloth or spray.

35

40

45

50

Properties of the proposed coatings are given in table. 2

Optimum content neomylae

of hydrocarbons in the composition of the release coating is in the range of 5-15 May L. When the content of the coating contains unsaponifiable

hydrocarbons above May 15.7, decreases the stability of graphite in solution and below 5 May. 7 decreases the efficiency of its action.

The optimal content of soap stock in the separation coating of 35-45 May.7 is below 35 May .7 - the coating resistance decreases. With an increase in soap stock over 45 May. 7, the viscosity of the coating increases and the covering capacity deteriorates.

When the content of silver graphite in the release coating is below 5 May.7 and above 15 May.7, its effectiveness decreases.

The use of the proposed separation of the coating in comparison with the known reduces the adhesion of the mixture to the foundry tooling, which allows to increase the number of removal forms and rods 4-10 times.

Claims (1)

Claim The composition of the separation coating for model-rod tooling mainly in the manufacture of raw forms from mixtures based on modified technical lignosulfonates, including a hydrophobic carbon-containing material and kerosene, characterized in that, in order to increase the resistance of the coating, as a hydrophobic carbon-containing material, the composition contains non-washed hydrocarbons in the production of detergent "Progress" and additionally contains soap stock - a by-product of alkaline refining of fats and oils and silver true graphite with the following ratio of ingredients, May. 7: Neodymy hydrocarbons in the production of detergent "Progress" Soapstock - a by-product of alkaline refining of fats and oils Silver graphite Kerosene 5-15 35-45 5-15 Rest five 15 14457 6 Table 1 Ingredients Content, wt.%, In the composition 2 G s T v five Hydrocarbons 3 five ten 15 20 Soap stock 50 45 40 35 27 Graphite silver 17 ' 15 ten five 3 Kerosene thirty 35 40 45 50 Alcohols from the second neomy- mrs - - - - Table 2 Properties Coatings composition: one I ² 3 I <i Coating viscosity VZ- 4, with 27 18 15 13 12 Coating density g / cm ³ 0.924 0.882 about, 865 0.860 0.847 The durability of the coating ( the amount of removal between treatments) 32-33 53-54 34 -35 22-23 14-15