SU990530A1 - Coating for rubber shaping surfaces - Google Patents

Description

(54) LUBRICANTS FOR RUBBER FORMERS

one

The invention relates to compositions for lubricating rubber molding surfaces used in the production of precast concrete, in particular in the production of reinforced concrete pipes by the method of hydraulic pressing and reinforced concrete in rubber-lined molds.

At present, in the manufacture of such products, a lubricant is used on un-aqueous solutions of podmilno-waste & garbage (soap stock) l.

The disadvantage of this lubricant is the increased adhesion of concrete to rubber, which makes it difficult to dismantle & spruce.

In addition, the use of this lubricant leads to the fact that the molding surfaces of rubber in the course of carrying out 10O-10O molding and steaming cycles lose elasticity, which sometimes leads to rupture of the rubber forming covers in the production of reinforced concrete pipes by the method of hydroelectricity. SURFACES

The closest possible result to the invention is a lubricant for rubber forming surfaces in the manufacture of concrete products, including soap and water in the form of a .5-20% aqueous solution of soap f 2.

However, the known lubricant does not sufficiently reduce the adhesion of the concrete to the form and does not provide the necessary service life, Q. rubber forms due to loss of elasticity of rubber.

The aim of the invention is to reduce the adhesion of concrete to the forming surfaces of the latter.

This goal is achieved in that the lubricant for rubber forming surfaces in the manufacture of concrete products, including soap and water, contains 20 additional sodium oxalate and urea in the following ratio of components, wt.%

Soap 5-2 Oh

Sodium oxalate O, O5-1,5

Urea0.03-1, O

WaterEverything

In the proposed lubricant, the oxalate natrv, the water-soluble salt of the oxaloic U1SLOT in urea is anti-adionic additives.

Urea also serves as a reagent that also contributes to the preservation of the elastic properties of rubber in the process of steaming reinforced concrete products.

The lubricant is prepared in the following manner.

Oxalic acid is dissolved in water, an amount of soda ash equimolphic relative to oxalic acid is added to neutralize oxalic acid. In the resulting solution of sodium salt of oxalic acid to. urea and soap. The mixture is stirred at BSO3 C until complete dissolution of the components.

The table shows the composition of lubricants, their anti-adhesive properties, as well. strength characteristics of rubber

.Famous

5% solution of soap3040

2O% solution of soap2OZO

Composition containing additives in an amount less than the proposed

Sodium oxalate 0.03

Urea-0.02,.

Soap

Water94.95

. The proposed composition of sodium oxalate 0.05

Uchevvina0, OZ 1520

Soap5

Water94 92

Sodium oxalate O, 1 Urea 0.03.

Soap51216

Water94,87

Oxapat sodium Oh 5

Urea 0.03.

Soap5810

Water 94.47.

2O

85 100 20

100

20

110

ZO

110

thirty

110

thirty

Continuity gabpvpy

As a result of the tests, it was found out that the samples are easily separated from the mold, which will prolong the service life of the rubber surfaces, namely: after

 500 molding cycles with a lubricant containing, in weight,%: sodium oxalate, 0; urea O, 5i soap Yu, water else, rubber covers (sample) 99 have an elongation of 1OO% and tensile strength of 15 kgf / cm. Thus, the service life of rubber covers is no less than 1.5 cuts. Formula and 3 about 6 re e and i Lubricant for rezinovBps form the surface of the preparation of concrete naples, | iklyuchuyuasha soap and so on, so as to d reduce the adhesion of concrete to: forming surfaces and increase the service life of the latter, it contains additional sodium oxalate and urea with a com- pound ratio of com- pounds, wt.%: 5–2 O sodium oxalate 0.5–1.5 Urea, Water Remaining Sources of information taken in BHH Mairae during examination 1. Ratinov B B, and y. Effective lubricant for vertical cassette forms. Moscow, Building Materials Industry, 1959, No. 3. p., 11, 2. Dovzhik p. And, and Ratinov V. B, Effective lubricants for the production of precast iron. M ,, Stro published, 1966, p. ten.

Claims (1)

Claim Lubricant for rubber molding surfaces <0 in the manufacture of concrete products, including soap and water, is different from the fact that, d to reduce the adhesion of concrete to the forming surfaces and increase the service life of the latter, it additionally contains oxalate sodium and urea with barely ₍ blowing ratio of components, wt.%: Soap '5-20 Sodium Oxalate 0.5-1.5 Urea 0.03-1> 0 Water Else