RU2400512C1 - Method of gluing rubber to metal - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention can be used in rubber industry to make rubber-metal articles, particularly water-resistant articles used at high temperatures (up to 90°C). The invention relates to a method of gluing rubber to metal through a cold curing method, which involves applying a layer of glue onto a processed metal surface. Rubber is glued to the metal using a ternary adhesive composition: a first layer of Chemosil 211 glue is applied onto a processed metal surface and dried, a second layer of Chemosil 221 or Chemosil 222 glue is applied on the first layer and dried, and two layers of 88 KR glue are applied on each processed metal and rubber surfaces, drying each of the layers and then gluing the surfaces.

EFFECT: higher bonding strength of polar raw rubber-based rubber with a metal alloy while maintaining high adhesiveness and adhesion strength when the article is used in water at high temperatures.

2 cl, 1 tbl

Description

The invention relates to a method for bonding rubber to metal with a polymer-based adhesive composition and can be used in the rubber industry in the manufacture of rubber-metal products, in particular water-resistant, operated at elevated temperatures (up to 90 ° C).

Known adhesive composition 88 NP (A.P. Petrova. Adhesive materials. M., Rubber and Rubber, 2002, p. 75) based on polychloroprene and butylphenol-formaldehyde resin, soluble in a mixture of ethyl acetate and nefras, used for bonding vulcanized rubbers to each other, with metals and other materials working in air at temperatures up to + 70 ° С.

The disadvantages of the known adhesive composition and method of its application is reduced water resistance and the inability to use it in products operating at temperatures above + 70 ° C.

The closest in technical essence and the achieved technical result (prototype) is the adhesive composition 88 KR and the method of its application (A.P. Petrova. Adhesive materials. M., Kauchuk and Rezina, 2002, p. 75) based on polychloroprene and phenol-formaldehyde resin soluble in a mixture of ethyl acetate and nefras. This composition is used for bonding vulcanized rubbers with metals, leather, wood and other materials working in air and water at temperatures up to + 90 ° C.

The disadvantage of this method is that the use of a single adhesive 88 KR does not provide sufficient bond strength, which leads to peeling of the adhesive film from the metal.

The technical result of the present invention is a method for bonding rubber to metal with a triple adhesive composition, which allows to obtain higher bond strengths of rubbers based on polar rubbers with a metal alloy while maintaining increased tack and fastening strength when using products in water at elevated temperatures.

The technical result is achieved by the fact that in the bonding method, the Hemosil 211-Hemosil 221 adhesive system is used as a primer before applying 88 KR glue to the surface of the shot metal.

Chemosil 211 is a universal primer (primer) for many adhesives brand Chemosil. Chemosil 211 adhesive combines crude rubber compounds based on nitrile butadiene rubber with metal and plastics. The connection occurs during the vulcanization process.

Chemosil 221 and 222 is a universal adhesive for bonding rubber compounds based on various rubbers with metal and plastics during the vulcanization process. They are mainly used in two layers with Chemosil 211 (Clay Chemosil 211, 221, 222. Instruction “Use of Henkel Chemosil glues for fastening rubbers to metal during vulcanization”, 1980, NIIRP).

Although Chemosil 211 and Chemosil 221 are hot cured adhesives, the method proposes to carry out the curing process of these adhesives at room temperature. When products are used at high temperatures, glue will cure over time. According to the proposed method, a triple combination of adhesives is applied in the following sequence: the first layer of Chemosil 211 glue is dried for 30-40 minutes, the second layer of Chemosil 221 glue (or Chemosil 222) is dried for at least 30 minutes at room temperature until the glue completely dries. At lower temperatures, the glue can dry for more than 40 minutes. At the final stage, according to the proposed method, the treated surfaces of rubber and metal are glued with 88 KR glue according to TU 201-951-10-96.

In the proposed method, in the adhesive composition, instead of one 88 KP glue, a triple glue composition (Chemosil 211, Chemosil 221 and 88 KP glue) is used in a certain sequence, and the curing of the glue composition occurs at room temperature by cold curing.

The technological process of applying a triple adhesive combination on the surface of rubber and metal is as follows:

1. On a metal-free skimmed nefras and dried for (15 ± 2) min, one layer of Hemosil 211 glue is applied with a thin brush and dried at a temperature of 18-35 ° С for 30-40 min until the glue completely dries.

2. Chemosil 221 or Chemosil 222 glue is applied to the metal surface treated as described above and dried for at least 30 minutes until the glue completely dries.

3. The surface of the rubber billet is treated with a steel wire brush or a circular brush.

4. The surface of the rubber billet is degreased with nefras and dried for (15 ± 2) min.

5. On the surfaces of metal and rubber treated by the methods described above, two layers of 88 КР glue are applied, drying the first layer of glue for 20-30 minutes, the second layer of glue - 5-7 minutes before tacking.

6. The surfaces of rubber and metal with successively applied Chemosil 211 and Chemosil 221 adhesives (or Chemosil 222) according to claims 1, 2 and 88 KR glue are glued according to TU 201-951-10-96.

To compare the bond strength of rubber with metal in rubber-metal products, the surfaces of which are treated in a known manner with one glue and the proposed method with a triple adhesive composition, samples were tested according to existing methods at elevated temperatures.

The test results of the bond strength of rubber with metal according to GOST 411-77 are presented in the table.

The test results of rubber-metal samples on the bond strength of rubber based on styrene-butadiene rubber SKMS-30 ARK, for example, with a PT-3V titanium alloy, allow us to conclude that the method of using a triple combination of Hemosil 211, Hemosil 221 adhesives and 88 KR glue applied in a certain sequence on the surface of rubber and metal, allows to increase the adhesive strength of rubber with metal and to obtain higher performance when using products at elevated temperatures compared with known methods of applying Ia adhesive mixture used without primer.

The company has positive experience in using the proposed method for bonding rubber with metal with a triple adhesive composition using the cold curing method in the manufacture of rubber metal products operated at elevated temperatures.

Claims (2)

1. The method of bonding rubber with metal by cold curing, which consists in applying a layer of glue to the treated metal surface, characterized in that the bonding of rubber with metal is carried out by a triple adhesive composition: the first layer of Hemosil 211 glue is applied to the treated metal and dried, the first layer is applied the second layer of glue Chemosil 221 or Chemosil 222 and dried, then two layers of 88 KP glue are applied to the treated metal and rubber surfaces, drying each of them, and then glued. 2. The method of bonding rubber with metal according to claim 1, characterized in that the drying time when bonding with the Chemosil 211-Chemosil 221 system (Chemosil 222) is: the first layer of Chemosil 211 glue is dried for 30-40 minutes, the second layer of Chemosil 221 glue or Chemosil 222 is dried for at least 30 minutes until completely dry, the first layer of 88 КР glue is dried for 20-30 minutes, the second layer of 88 КР glue is 5-7 minutes.