SU1551548A1 - Lubricant for moulds and forms - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the production technology of concrete and reinforced concrete products for the lubrication of forms and formwork. The purpose of the invention is to improve the quality of the surface of concrete products and the stability of the lubricant when used at negative temperatures. Lubrication for molds and formwork contains 96,0-99,5 wt.% Lubricating oil and 0.5-4.0 wt.% Hydrocarbon resin synthesized by oligomerization of C ₅ fraction by-production of isoprene in a solution of mineral spirits. The lubricant works in conditions of high and negative temperatures and provides high quality concrete surface. 2 tab.

Description

The invention relates to the building materials industry and can be used in the production technology of concrete and reinforced concrete products for the lubrication of forms and formwork.

The purpose of the invention is to improve the quality of the surface of concrete products and the stability of the lubricant when used at negative temperatures.

The formwork and formwork lubricant contains engine oil and hydrocarbon resin additives synthesized by oligomerization of the side Ce-fraction of isoprene production in white spirit solution in the following ratio, wt.%:

Machine oil 96-99,5

Hydrocarbon resin 0.5-4.0

The hydrocarbon resin used to prepare the lubricant is synthesized by the oligomerization of the by-product Cs fraction of isoprene production, including isoprene, isoamylenes, cyclopentadiene and piperylene in a white spirit solution in the presence of a modified Friedel-Crafts catalyst. The resulting product is a cooligomer of the above comonomers in the following ratio of components

May%:

Isoprene

Isoamylene

Cyclopentadiene

Piperylene

Main characteristics

Noah resin: mol. May 700- 170-210 g b / yu

0.5-7.5

1.0-7.0

0.3-3.0

Rest

hydrocarbon 1200, iodine number

ate

4 00

The final co-oligomerization product can be isolated both individually and with up to 15–20 wt.% Residual solvent (white spirit). Therefore, both types of hydrocarbon resin are used to prepare lubricants.

The lubricant is prepared as follows.

The required amount of engine oil and hydrocarbon resin is introduced into a vessel equipped with a stirrer and a source of heating current (to create a temperature of 25-30 ° C), then the components are mixed for 5-10 minutes until a homogeneous mixture is obtained. When using a solution of a hydrocarbon resin in white spirit, the lubricant is prepared without heating the components. Stirring is carried out for 3-5 minutes.

The resulting grease is applied to the surface of the molds by any of the known methods: by brush, brush, roller, or by spraying devices. The consumption of lubricant per 1 m2 of the surface of the forms is 70-75 g.

In tab. Table 1 shows the compositions of the proposed and known lubricants, for which viscosity tests, specific {consumption, energy consumption for preparation, transportation and storage, quality of IHOCTH concrete products were carried out.

 Table 2 shows the test results for lubricants.

As can be seen from the table. 2, the proposed lubricant provides improved surface quality of concrete products and the possibility of using lubricant at low temperatures (i.e., achieving positive results in terms of viscosity reduction, reduction in specific consumption, improved processability and transportation).

The lubricant with organic additive based on hydrocarbon resin is frost-resistant: after freezing in the freezer at -15 ° C for 12 hours and subsequent defrosting, it retains its operational properties (composition 6). In addition, in order to save engine oil, the use of used {machine oils is allowed without reducing the anti-adhesive properties (composition 7).

0

five

0

five

0

five

0

The resulting lubricant can be used both for the fabrication of autoclaved hardening and hardening in natural conditions or subjected to heat treatment (steaming). This lubricant can be used in the manufacture of special purpose concrete.

The proposed lubricant also ensures the hydrophilicity of the concrete surface, the natural color of the concrete (whiteness) is preserved in the resulting products, there is no difference in the surface layer and other defects (shells, chips) due to the quality of the lubricant. This allows refusing such a technological operation as cleaning the concrete surface to be trimmed, and also reduces the consumption of surfactants introduced into the aqueous finishing compositions to improve the wetting of the concrete surface. Thus, the use of a hydrocarbon resin in lubrication as an organic additive reduces lubricant consumption, completely eliminates energy consumption during transportation and storage of lubricant, reduces energy consumption for lubricant manufacturing, reduces production costs for cleaning forms and subsequent cleaning of concrete and reinforced concrete products.

Claims (1)

Invention Formula Lubricant for forms and formwork in the manufacture of concrete and reinforced concrete products, including machine oil and the addition of hydrocarbon resin synthesized by oligomerization of the secondary Cz fraction of white spirit production of isoprene, characterized in that, in order to improve the quality of the surface of concrete products and the stability of the lubricant when used at negative temperatures, it contains these components in the following ratio, wt.%: Machine oil 96-99,5 Hydrocarbon resin 0.5-4.0 Table 1 # - : 85% solution of hydrocarbon resin in white spirit. After the freeze-thaw cycle.  Used engine oil. Cannot be used at negative temperatures to lubricate forms. Compiled by V. Lebedeva Editor N. TupitsTehred I. VeresKorrektor A. Obruchar Order 299 Circulation 506 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing combine “Patent, Uzhgorod, ul. Gagarin, 101 a b and c a 2