RU2030948C1 - Parting coating for model equipment - Google Patents

Abstract

FIELD: casting. SUBSTANCE: vat residue of preparing hydrated fuel is used as a base of said coating. Products of oil processing, alcohols and fat acids are added to this base. Extracts of selective refining of petroleum oil distillates or of mazut, or alcohols, or unsaponifiable compounds having 6-22 carbon atoms, or fat acids being side products of their production of paraffin or of sebacic acid production which represents mixture of saturated and unsaturated acids may be used as mentioned above additives. EFFECT: improves quality of casting. 2 tbl

Description

 The invention relates to foundry, and in particular to compositions of release coatings for model equipment.

 Separation coatings for model equipment based on kerosene are known in the foundry industry, including various technological additives, such as fatty acids [1], alcohols from the second unsaponifiables [2].

All these coatings basically comprise kerosene, relating to flammable liquids (HIL), a flash point of 40 ^{° C} (GOST 4753-68) that creates increased fire risk. In addition, kerosene has a pungent odor, and its use as a part of dividing coatings worsens sanitary and hygienic working conditions.

Closest to the invention in technical essence and the achieved effect is a release coating for tooling containing an extract of selective purification of oil distillates of oil, as a processing aid, and kerosene as a base in the following ratio of ingredients, wt. %: Extract of selective purification of oil distillates of oil 5-15 Kerosene 85-95 [3]
However, the known coating has an increased fire hazard, since it basically also contains a flammable liquid - kerosene.

 The technical result of the invention is to reduce fire hazard and improve working conditions.

Separation coating for model equipment, consisting of a base and a technological additive in the form of an extract for the selective purification of oil distillates of oil or fuel oil, or fatty acids, or alcohols from second unsaponifiables, contains base residues of hydrogenated fuel production under the RZh-8 brand in the following ratio ingredients, wt.%: VAT residue of the production of hydrogenated fuel, RZH-8 50-95 Technological additive The rest
The bottoms of hydrogenated fuel production is a product of oil refining, is produced according to TU 38.101.883-83 under the brand name RZH-8 and is a mixture of hydrocarbons of various molecular weights.

RG-8 does not belong to the group of flammable liquids, does not irritate the skin and mucous membranes, it does not have a pungent odor and has the following characteristics: Flash point in closings crucible 120 ^C.
(not lower) Kinematic viscosity at 20 ^о С 6.0-8.5 mm ² / s Mass fraction of aromatic hydrocarbons 5.5%
(no more) pour point minus 6.0 ^о С
(not higher) Mass fraction of sulfur 0,01%
(not higher)
To obtain the proposed separation coating were prepared five compositions of the ingredients (1, 2, 3, 4, 5) and in parallel was prepared composition 6 of the known coatings, adopted as a prototype.

 In addition, three mixtures were prepared (7, 8, 9) with different technological additives based on bottoms from the production of RZh-8 hydrogenated fuel to compare the technological properties of the separation coatings with the known technological additives. Fatty acids are taken as fatty acids, which are a by-product in the production of sebacic acid and are a mixture of saturated and unsaturated acids.

 Alcohols from the second unsaponifiables are alcohols containing from 6 to 22 carbon atoms and are a by-product in the production of fatty acids from paraffin derived from oil.

 Examples of the composition of the separation coatings are given in table 1.

 Each mixture was prepared separately in containers by simple mixing of the components. Finished coatings were sprayed onto the model equipment.

 The test results of each mixture are presented in table.2.

 From the above table. 2 data shows that the claimed separation coating (compositions 2, 3, 4) provides good technological properties, that is, it has good hiding power, there is no adherence of the mixture to the tooling and a sufficient number of mold removal.

 With a decrease in the content of still bottoms of the production of hydrogenated fuel RZH-8 less than 50 wt.h. in structure 1, the adhesion of the release coating to the model equipment is noted.

 With an increase in the content of RZH-8 more than 95 parts by weight in composition 5, the coating is applied with a thinner layer, which reduces the number of mold removal.

The proposed separation coating will reduce the fire hazard, since it basically contains bottoms from the production of hydrogenated fuel RZH-8, which is a mixture of different mol. weight of hydrocarbons having a flashpoint of at least 120 ° ^C.

 When working with the proposed coating there is no pungent odor, and there is no irritating effect on the skin and mucous membranes.

Claims (1)

SEPARATION COVER FOR MODEL EQUIPMENT, containing a base from an oil refining product and an extract for the selective purification of oil distillates of oil or fuel oil, or alcohols from second unsaponifiables containing 6 to 22 carbon atoms and which are a by-product in the production of fatty acids from paraffin, or fatty acids, which are a by-product in the production of sebacic acid and are a mixture of saturated and unsaturated acids, characterized in that as the basis of the product of oil refining comprises a hydrogenated resid fuel in the following ratio, wt.%:
Distillation residues of hydrogenated fuel production - 50 - 95
The extract of selective purification of oil distillates of oil or fuel oil, or alcohols from second unsaponifiables containing 6 to 22 carbon atoms and which are a by-product in the production of fatty acids from paraffin, or fatty acids, which are a by-product in the production of sebacic acid and are a mixture of limiting and unsaturated acids - Else

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