CS277524B6 - Impregnation bath for synthetic textile materials to reinforce rubber products - Google Patents

Abstract

The previously known impregnation baths for the mentioned materials allow a certain increase in their adhesion to rubber. For the most demanding applications, a further increase in adhesion values is required, which is enabled by the impregnation bath according to the solution. The bath based on resorcinol-formaldehyde resin and rubber latexes is modified with polyvinyl chloride latex in an amount of up to 25% by weight of the total dry weight of the impregnation bath.

Description

The invention relates to an impregnation bath for synthetic, in particular polyamide and / or polyester textile materials for reinforcing rubber products, in particular tires, conveyor belts and belts.

Rubber products exposed to long-term periodic deformations are reinforced with suitable textile materials that carry part of the mechanical loads. Sufficient cohesion of the textile frame with rubber is then a condition for the long life of these products under operating conditions.

The required cohesion between the textile reinforcing materials and the rubber is ensured mainly by impregnating the reinforcing materials with impregnation baths based on resorcinol-formaldehyde resins and rubber latexes. Examples are natural latex, butadiene-styrene, vinylpyridine. Impregnations of this type usually provide sufficient cohesion values. However, products of exceptional quality intended for particularly demanding applications, especially with an emphasis on dynamic characteristics, require a further increase in the values of cohesion of textile reinforcement with rubber achieved in this way.

A further increase in the adhesion of said components is made possible by an impregnation bath for synthetic, in particular polyamide and / or polyester textile materials for reinforcing the rubber products according to the invention. The essence of the invention lies in the fact that the impregnation bath, formed on the basis of resorcinol-formaldehyde resin and rubber latexes, contains up to 25% by weight of dry matter of polyvinyl chloride latex from the total dry matter. The impregnation bath according to the invention makes it possible, with considerable economic advantage, to increase the cohesion of the textile reinforcing material with the rubber, as the following examples show.

A resin solution of the following composition was prepared:

resorcinol 1.9 formaldehyde 38% 2.7 NaOH 10% 1.6 water 38.5

44.7 wt. d. (+ 2 h maturation)

This solution was used as a component of individual impregnation baths:

Spa no. 1 2 3 4 COMPOSITION: (mass d.) resin solution 44.7 44.7 44.7 44.7 Bunatex VP 40% 25.7 22.0 18.9 25.0 Kralex 20% 16.0 13.0 16.0 14.0 natural latex 62% 5.6 4.8 5.6 - PVC latex 44% - 6.7 6.7 8.3 NH ₄ OH 25% 0.5 0.5 0.5 0.5 water 7.6 7.5 7.6 4.8

ADHESION: (N)

H-test (ČSN 621462) 126 144 143 149

Continuation of the table

Spa no. 1 2 3 4 Henley (ČSN 621464): def 35 mm 199 211 '214 211 def 43 mm 190 195 212 197 def 51 mm 158 185 205 178 control 200 213 215 215.

The determined values of the adhesive efficiency of baths 2, 3, 4 (dry matter content of PVC latex 15, 18, 20%) show a clear increase compared to bath 1 (without PVC latex). Due to the course of these values, the real range of the effect of the invention is up to 25% by weight of the dry weight of PVC latex from the total dry weight of the impregnation bath.

Claims (1)

PATENT CLAIMS Impregnation bath for synthetic, in particular polyamide and / or polyester textile materials for reinforcing rubber products, in particular tires, conveyor belts and belts, based on resorcinol-formaldehyde resin and rubber latexes, characterized in that it contains up to 25 wt. percent dry weight of polyvinyl chloride latex.