SU905114A1 - Composition for preventing sticking of rubber mixes - Google Patents

Description

(COMPOSITION FOR PREVENTION OF SLIPPING OF RUBBER MIXTURES

I

This invention relates to the rubber industry and concerns the development of a composition for preventing adhesion of rubber compounds.

Known composition based on aqueous suspensions of powdered components 1. However, this composition results in dusty production.

Closest to the proposed technical essence is a composition based on an aqueous solution of a surfactant — an alkyl sulfate, for example, a secondary sodium alkyl sulfate C23.

However, this mixture does not reduce the stickiness of the rubber compounds and reduce the foaming of the composition.

The purpose of the invention is to reduce the adhesiveness of rubber compounds and reduce the foaming of the composition.

The goal is achieved by the fact that the composition for preventing

adhesion of rubber mixtures based on an aqueous solution of surfactant - alkyl sulfate contains as a surfactant alkyl sulfates with alkyl Cg-Cj, and additionally monoethanolamine in the following ratio, wt.%: Alkyl sulfates with alkyl

Cr 3,0-7,0

Monoethanolamine, 0.1-0, Water Else

Example 1. To prepare an insulating composition, components are taken at a ratio, wt.: Alkyl sulfates of the Cj-C fraction, - 3.0; monoethanolamine - 0.1; water - 96.9.

The components are placed in a vessel with a vertical stirrer and stirred at room temperature until a homogeneous mass is obtained. The tendency of the composition to foaming is determined as follows: 100 cm of the prepared composition is placed in a granular glass cylinder. The cylinder is held from the front parts

with two hands in a horizontal position and shake in the direction of the longitudinal axis. After shaking, the cylinder is placed on the table, the plug is removed and the volume of foam formed is counted. The time for the foam to be quenched is determined.

After determining the tendency of the insulating composition to foam, the granules of the rubber mixture are treated on the basis of 100 May. synthetic cis-1, -isoprene rubber SKI-3 (type brekerna, mixture). To obtain pellets, the rubber mixture, preheated on rollers, is passed through a syringe machine. The resulting billet in the form of a cord ф mm is cut into areas of 20–25 mm long (granules). The granules treated with the proposed insulating composition are dried at room temperature until complete drying and then determined

the amount is placed in an aluminum cup. On the entire surface of the granules put the load, based on a specific load of 30 gf / cmL The glass is placed

thermostat and incubated for a certain time at itOiZ C. Granularity-granules are determined visually and are characterized by the ability to disperse them when the glass is tilted 180 degrees from a certain height.

Example 2. Similar to example 1, but the components are taken in a ratio, wt.%: Alkyl sulfates (fraction

C5-C) -5.0; monoethanolamine - 0,2; water - gf.e.

Example 3. Similar to examples 1 and 2, but the components are taken in the ratio, wt.%: Alkyl sulfates

(fraction Cg-C) - 7, JO; monoethanolamine - Ojf; water - 92.6.

The test results are shown in the table.

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The analysis of the presented results shows that the proposed insulating composition, which includes alkyl sulfates (Cg-Cj fraction) and monoethanolamine at the indicated ratios of the components, has a much lower tendency to foaming compared to the known surfactant-based composition. Progress times, its total quenching time is 5-6 times than the known one.

In addition, the proposed insulating composition has high anti-adhesive properties. So, the storage time without sticking granulated rubber mixtures treated with the proposed composition containing 7.0 wt. alkyl sulfates (fractions Cg-Cg) and 0, May,% monoethanolamine, is 13 days, while the granules treated with the known isolating composition containing surfactant Progress adhere after 5 days of storage.

Claims (1)

1.Nazarov V.D. and others. Storage granulated (x rubber mixtures. Manufacture of tires, rubber and asbestos products). Scientific and technical abstract collection. M., 1978, p. 2T-2B. 2, Novikov M.M. and others. The use of surfactants to protect rubber compounds from sticking. Production of tires, rubber and asbestos products. Scientific and technical abstract collection. M., 1966, No. 1, p. 13-1 (prototype).