RU2315804C1 - Lubrication emulsion - Google Patents

Abstract

FIELD: lubricants.

SUBSTANCE: invention relates to production of lubricants, reversed and direct emulsions, and, in particular, to lubrication emulsion that, due to its stability and whiteness, can be used to lubricate metal and gypsum molds employed in manufacture of decorative white and colored concrete and reinforced-concrete articles. Emulsion is prepared at rotation of a rotor in mixer inclined by up to 45° to horizon using speed 1100-1200 rpm. Emulsion is composed water, 30-50%, oil, 30-50%, lime, 0.5-2%, and hydrophobic chalk, 18-22%. The latter is obtained by hydrophobization of chalk with synthetic fatty acid fraction C17-C20 having whiteness above 90%.

EFFECT: increased stability of emulsion and quality of concrete articles manufactured in the process involving this emulsion, eliminated fat spots on articles, increased their whiteness, and facilitated removal thereof from molds.

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Description

The claimed invention relates to the production of various lubricants, emulsions, pastes in the manufacture of building materials and can be used for the lubrication of metal, gypsum concrete and other forms before molding products from decorative concrete and reinforced concrete. From the technical level for the lubrication of molds before the manufacture of concrete and reinforced concrete products, the known lubricant containing water and chalk is known (Sizov VN Technology of concrete and reinforced concrete products. 1972, p.255).

The disadvantage of this lubricant is erosion when filling the form with a solution and does not hold well on the walls of the form.

At the technical level, the composition is known that is closest to the claimed inverse emulsion, used to lubricate concrete and reinforced concrete products, containing, wt.%: Spindle oil - 19, bottoms - 1, water - 79.5, lime - 0.5 ( Gershberg SA Technology of concrete reinforced concrete products. Publishing house of building literature. M., 1971, p.199).

A disadvantage of the known lubricant composition is its low stability. This grease is non-heat resistant, burns out when applied to a hot surface of a metal mold, leaves oil stains on the surface of concrete and reinforced concrete products.

The objective of the invention is to improve the quality of molded concrete and reinforced concrete products using grease.

The technical result that can be obtained by implementing the inventive emulsion for lubrication are:

- its stability,

- whiteness,

- retention on the surface of the molds,

- non-burnout on a hot metal surface,

- manufacturability in cooking,

- the absence of grease stains on the surface of decorative concrete products.

The solution of this problem and the achievement of the above results became possible due to the fact that the composition of the emulsion for lubricating the surface of metal and gypsum concrete forms for the manufacture of decorative concrete and reinforced concrete products is prepared in an inclined homogenizer, and a stable inverse emulsion contains hydrophobic chalk with the following ratios of components, wt.%:

water 30-50 oil 30-50 lime 0.5-2 hydrophobic chalk 15-22

Hydrophobic chalk is a fine powder consisting of particles of chalk coated with a layer of water repellent.

Synthetic fatty acids of the C17-C20 fraction are used as a water repellent.

In the process of preparing a stable inverse emulsion for lubrication, dispersion under the action of the homogenizer blades, the hydrophobic chalk aggregates crack, part of the surface becomes hydrophilic, and the chalk particles as a whole become diphilic. Water in the emulsion for lubrication breaks up into droplets with a diameter of 50-200 microns, particles of hydrophobic chalk cover the surface of each drop with the so-called “armor layer”, the hydrophilic surface is drawn into the aqueous phase, and the hydrophobic is ejected from it, so that the chalk particles are located on the interface water-oil, forming, stabilizing the inverse emulsion for lubrication.

The proposed emulsion for lubrication has high adhesion, stickiness to metal, which ensures its resistance to erosion when filling molds for the manufacture of concrete and reinforced concrete products.

The introduction in the manufacture of an emulsion for the lubrication of a hydrophobic chalk having a whiteness of more than 90% stabilizes the emulsion for lubrication, it does not delaminate and is stored for a long time, the appearance of oil stains on concrete products is eliminated, the whiteness is increased, the clarity of concrete and reinforced concrete products is increased, the emulsion increases erosion resistance when filling the mold with concrete, it increases adhesion, stickiness to the surface of the metal mold, does not fade when applied to a hot surface of a metal mold. In particular examples, the proposed composition of the emulsion for lubrication involves the use of not only spindle, but other types of oils, for example, solar. Lime with an activity of up to 80% can be used in the form of slaked fluff or in the form of lime paste, milk. The hydrophobic chalk produced by the Shebekinsky combine of building materials or other plants. Tap water or technical water from open reservoirs or wells.

Example

The composition of the emulsion for lubrication was prepared with a specially designed mixer, inclined up to 45 degrees, with a volume of 150 liters and a shaft rotation speed of 1100-1200 rpm. Water was poured - 40 liters, lime powder or lime dough - 1 kilogram, after 3-5 minutes hydrochloric oil - 40 liters was added, after 10-15 minutes evenly hydrophobic chalk - 19 kilograms was added in small portions and mixed for another 5-10 minutes until a uniform emulsions for lubrication. The emulsion for lubrication was subjected to natural tests in the workshop of the concrete goods plant-3 and in laboratory conditions for stability, daily sediment, and the ability to increase the whiteness of concrete products.

Table Composition No. (wt.%) one 2 3 four 5 6 prototype Chalk hydrophobic 19 eighteen 19 twenty 21 22 0 Water 40 thirty fifty 39.5 45 32,5 79.5 Oil 40 fifty thirty 39.5 32,5 45 19 Lime one 2 one one 1,5 0.5 0 VAT residue 0 0 0 0 0 0 1,5 Emulsion Properties for Lubrication Sludge,% 1 day 0.1 0.1 0.1 0.1 0.1 0.1 13 30 days 0.6 0.8 0.5 0.7 0.5 0.6 17 The increase in whiteness,% 16 17 fifteen eighteen fifteen twenty 0

According to the test results, it is clear that the proposed composition of the prepared emulsion for lubrication does not exfoliate for a long time, has high stability, which lasts more than a month. When using the emulsion for lubrication, the whiteness of finished concrete products increases by 15-29%, grease stains do not form on the products, they are easily separated from the metal mold, the emulsion is effective not only on the clean surface of the mold tray, but also on a cement film, uneven metal surface forms with scratches and dents. The emulsion for lubrication was applied to the surface of the metal mold with a roller, brush or spray, held well on horizontal and vertical surfaces of metal molds, did not fade on a hot surface up to 100 ° C, did not adversely affect hardening concrete, improved the production culture, sanitary conditions, safe in a firefight.

Emulsion for lubrication is especially effective at concrete plants and DSK in the manufacture of concrete products with a white or colored surface, in the volumetric and cassette production of concrete and reinforced concrete products

Claims (1)

An emulsion for lubrication containing water, oil and lime, characterized in that it is prepared by rotating the rotor in a mixer, tilted up to 45 ° to the horizon, at a speed of 1100-1200 rpm, the emulsion contains hydrophobic chalk obtained by hydrophobization of chalk with synthetic greasy acids of the C17-C20 fraction and having a whiteness of more than 90% with the following content of components, wt.%: Water 30-50 Oil 30-50 Lime 0.5-2 Chalk hydrophobic 18-22