RU2190526C2 - Lubricating agent for metallic forms - Google Patents

Abstract

FIELD: industry of building materials. SUBSTANCE: invention relates to lubricating agents for forms in making concrete and ferroconcrete articles. A lubricating agent for metallic forms in making concrete and ferroconcrete articles comprises spent motor or machine oil, emulsifying agent, tall pitch and an oxalic acid and water as an addition in the following ratio of components. , wt. %: spent motor or machine oil, 15-45; saponified tall pitch, 1.5-4.5; oxalic acid, 0.1-0.3; water, the balance. Invention provides the enhancement of quality of articles surface, among them, whiteness, enhanced stability of a lubricating agent, its multiple using, exclusion of corrosion of metallic forms. EFFECT: enhanced quality and properties of lubricating agent, decreased cost. 1 tbl

Description

 The invention relates to the building materials industry, namely, lubricants for molds in the manufacture of concrete and reinforced concrete products.

 Form lubrication is a mandatory technological operation in the production of concrete and reinforced concrete products.

 Known lubricant for metal molds in the manufacture of concrete products, including motor oil and an additive - oxalic acid / 1 /.

 The disadvantage of this lubricant is its low stability and the use of expensive oil-based oil compounds in the lubricant, leading to an increase in its cost.

The closest technical solution, selected as a prototype, is a lubricant for metal molds, including used motor or engine oil, saponified tall oil pitch, sulfuric acid and water in the following ratio, wt.%:
Waste engine or engine oil - 10-45
Saponified tall pitch - 1.0-1.5
Sulfuric acid - 0.08-0.15
Water - the rest / 2 /
The disadvantage of this lubricant is that when using saponified tall oil pitch obtained in the production of pulp, with this ratio of components, the formation of greasy spots on the surface of concrete products is not currently ruled out.

 The objective of the invention is to improve the quality of the surface of products, including its whiteness, increase the stability of the lubricant, eliminate corrosion of metal forms, reduce the cost of lubrication, the possibility of reusable use of lubricant.

This problem is solved in that the lubricant for metal forms in the manufacture of concrete and reinforced concrete products, including used motor or machine oil, emulsifier - saponified tall oil pitch, the additive - acid, and water, contains oxalic acid as an additive in the following ratio of components, wt. %:
Spent engine or engine oil - 15-45
Saponified tall pitch - 1.5-4.5
Oxalic acid - 0.1-0.3
Water - Else
The interaction of used motor oil, saponified tall oil pitch and oxalic acid results in the formation of a lubricant - a complex composition including esters. Oxalic acid in this composition acts as an optical brightener - it increases the whiteness of concrete products.

 For the preparation of the lubricant, used engine oil, saponified tall oil pitch (OTP), a waste from the Bratsk LPK / OST-13-145-82 / sulfate-cellulose production, which is a surfactant, oxalic acid and water, was used. The introduction of OTP in the composition of the lubricant provides a stable lubricant by obtaining a stable emulsion in the pitch - tar and fatty acids. As a result of the reaction of components of saponified tall oil pitch with waste oil and oxalic acid, sodium soaps are formed, which are hydrophilic emulsifiers and give an oil-in-water emulsion.

 Used motor oil based grease is a brown paste that is easily applied to the mold surface by rubbing or spraying under pressure.

 The paste has a sufficiently high adhesion to the surface of metal molds and ensures the application of a lubricant with a thin layer of uniform thickness. Greasing can be done both in cold and in hot condition.

 Examples of the composition of the lubricant, eliminating the formation of greasy spots on the surface of products, excluding corrosion of metal forms, increasing the stability of the lubricant in the following ratio of components, wt.% (See table).

Spent engine or engine oil - 15; thirty; 45
Saponified tall pitch - 1.5; 3.0; 4,5
Oxalic acid - 0.1; 0.2; 0.3
Water - Else
Lubricant preparation is carried out in a paddle mixer and therefore lubrication can be prepared in any plant or precast test site. The total duration of mixing the components is determined by the time to obtain a homogeneous paste and is approximately 20-30 minutes

 All components except oil are used in the form of aqueous solutions, with oxalic acid being added along with the estimated amount of water.

To accelerate the dissolution of saponified tall oil pitch, it is recommended to heat the water to 30-40 ^o C.

 To improve the quality of the lubricant after long-term storage, short-term mixing for 1 minute is desirable.

 The use of a lubricant of this composition makes it possible to ensure good redistributability, a flat and smooth surface of concrete and reinforced concrete products without greasy stains that impair appearance and require additional costs for their removal, to eliminate corrosion of metal forms. The use of waste motor or machine oils will allow you to abandon the use of expensive oil-based petroleum compounds for lubricants, this will reduce the cost of lubrication.

Sources of information taken into account
1. A.S. 546477, B 28B 7/38, 1977.

 2. A.S. 1768394, B 28 V 7/38, 1992 - prototype.

Claims (1)

Grease for metal molds in the manufacture of concrete and reinforced concrete products, including used motor or machine oil, emulsifier - saponified tall oil pitch, additive - acid and water, characterized in that it contains oxalic acid as an additive in the following ratio, wt.%:
Spent engine or engine oil - 15-45
Saponified tall pitch - 1.5-4.5
Oxalic acid - 0.1-0.3
Water - Remains

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