RU2282643C1 - Method of attaching cured rubbers based on acrylate rubbers to metallic surfaces - Google Patents

Abstract

FIELD: rubber industry.

SUBSTANCE: invention, in particular, relates to attaching acrylate rubber to metal during vulcanization and can be used in manufacture of general mechanical rubber goods (e.g. seals) for automobile industry operated under effects of air and working medium at elevated temperatures (gearset). Carcass is successively treated, in the first stage, with adhesive composition containing 2-5% aminopropyltriethoxysilane, 15-25% ethyl alcohol. And deionized water to 100%. In the second stage, treatment is effected with 0.2-0.4% aqueous solution of resorcinol-formaldehyde resin (SF-282) followed by drying at 100-150^°C. Consumption of composition in the first and second stages of treatment of carcass achieves 60-80 ml/m² for each stage.

EFFECT: increased strength of attachment.

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Description

The invention relates to the development of an adhesive composition for attaching rubber to metal during vulcanization and can be used in the manufacture of rubber products for the automotive industry.

It is known to use carbofunctional organosilicon derivatives, in particular 3-aminopropyltriethoxysilane, for the preparation of adhesives and surface treatments (Motsarev G.V., Sobolevsky M.V., Rosenberg V.R. Carbofunctional organosilanes and organosiloxanes. Moscow: Chemistry. 1990, p. 124 ; Novitskaya S.P., Nudelman Z.N., Dontsov A.A. Fluoroelastomers. Moscow: Chemistry. 1988, p. 180). Such adhesives may contain resins (resole, phenolic), 3-aminopropyltriethoxysilane (AGM-9), and a solvent (methyl ethyl ketone). The water content in the organic solvent - methyl ethyl ketone (TU 6-09-782-76) is limited by the regulatory document and does not exceed 0.8 wt.%. The organic solvent in such adhesives is the main, water - secondary. When diluting methyl ethyl ketone with water in such an adhesive, the adhesive strength of rubber to metal significantly decreases.

Known water adhesives company Henkel XW 7484 and XW7856, which are aqueous dispersions, coalescing on the surface of a heated metal into a monolithic film (Morozov Yu.V., Reznichenko S.V. Recent advances in the field of chemistry and technology of elastomers. - International Conference on Rubber and IRC 98 rubber. Rubber and rubber, 1, 1999, p. 46). Such adhesives are comparable to solvent containing systems, although they are slightly inferior to them in terms of the strength of the rubber to metal. However, there are no data for fixing rubber based on which elastomers and what their composition is (Bayersdorf D. Fastening rubber to metal using Henkel binding systems. Rubber and Rubber, 6, 1996, p.3 ... 7).

Known adhesives and adhesives for attaching rubber products based on acrylate rubbers to metal surfaces during vulcanization: Chemosil, which are a set of various soluble polymers, dispersed solids.

The composition of the water-based adhesive VA-1 includes phenolic water-soluble resin, polymers (polybutadiene) and dispersed solids. The specific composition is not given.

Closest to the claimed method is an adhesive composition (Golfarb V.I., Lyapaev N.A., Gorban V.I., Pichkhidze S.Ya. Patent No. 2180675. Adhesive composition, prototype), which is an aqueous adhesive for fluorine rubbers, suitable for attaching acrylate rubbers to the metal surface of the cuff reinforcement. The main disadvantage of the adhesive is the need to comply with the homogeneity of the composition, which is a set of various soluble polymers and dispersed solids.

The technical result of the invention is the achievement of high strength fastening of acrylate rubbers to the metal surface of the reinforcement of the cuffs by separately applying a two-component water-soluble adhesive composition with a low solids content.

The specified technical result is achieved by synthesis of the adhesive directly on the surface of the reinforcement in the presence of AGM-9 and a solution of the water-soluble resorcinol-formaldehyde resin SF-282.

The proposed method of fastening acrylate rubbers 2801 (rubber base Acron AR-740) and 2802 (rubber base Acron XF-5140) to the metal surfaces of the reinforcement includes pre-treatment of the reinforcement with a water-alcohol composition based on AGM-9 and the subsequent aqueous solution of resorcinol-formaldehyde resin SF-282. The drying temperature of the reinforcement is 100-150 ° C with an adhesive flow rate of 60-80 ml / m ² at each stage of processing of the reinforcement, respectively.

Example

20 g of ethyl alcohol, 3.5 g of AGM-9 (TU 6-02-724-77) and 76.5 g of deionized water (sample No. 3, Table 1) are placed in a vessel. Get a clear solution No. 1. For intended use, the solution is applied to the metal surface of the reinforcement with a brush, dipping or spraying in one to three layers. Then apply a 0.3% aqueous solution of SF-282 (resorcinol-formaldehyde liquid resin brand SF-282, TU 6-07-402-90, KNPO "Karbolit") - solution No. 2. The drying temperature of the reinforcement is 100-150 ° C with an adhesive flow rate of 60-80 ml / m ² at each stage of processing of the reinforcement, respectively.

The bond strength of rubber with standard metal samples was evaluated according to TU 38.105-823-88 "Rubber parts for automobiles GAZ, KamAZ and other plants." The norm for technical specifications for rubber products is at least 25 kgf / cm ² for cuffs (glands).

Samples of adhesive compositions are given in table 1, strength characteristics in table 2. For tests used acrylate rubber compounds of the following composition:

1) rubber compound 2801 (per 100 mass parts of rubber):

Acron rubber AR-740 - 100, sulfonate powder - 3, zinc dimethyldithiocarbamate - 2, acetonanil R - 2, stearic acid - 2, white carbon black BS-100 - 10, microtalc - 20, graphite - 20, technical carbon T-900 - 45;

2) 2802 rubber compound (per 100 mass parts of rubber):

rubber Akron XF-5140 - 100, sulfonate powder - 3, AGM-9 - 2, stearic acid - 2, white carbon black BS-100 - 30, microtalc - 20, graphite - 2, technical carbon T-900 - 45, wollastonite - 20, hexamethylenediamine carbamate - 1, di-ortho-tolylguanidine - 2.

Table 1
Samples of tested adhesive compositions (wt.%) Components Sample one 2 3 four 5 Solution No. 1 3-aminopropyltriethoxysilane one 7 3,5 2 5 Ethanol 10 40 twenty 25 fifteen Deionized water 89 53 76.5 73 80 Solution No. 2 Resorcinol-formaldehyde resin SF-282 0.1 0.5 0.3 0.2 0.4 Deionized water 99.9 99.5 99.7 99.8 99.6 table 2 Physical and mechanical tests of adhesive compositions (average of 5 samples) Sample Adhesive strength, kgf / cm ² , rubber compound 2801 2802 one 23,4 22.4 2 24.5 24.7 3 31.1 30,0 four 28.0 27.1 5 29.6 28.5 prototype 19.5 18.8

Testing of glue (adhesive) for attaching rubber to the metal surface of the reinforcement was carried out on fungi and directly on the part 2101-2402052-03 - the seal of the rear axle gearbox with satisfactory experimental results.

Claims (1)

The method of processing the metal surface of the reinforcement for attaching rubber based on acrylate rubber to it, including sequential processing of the reinforcement at the first stage with an adhesive composition, wt.%: 3-aminopropyltriethoxysilane 2-5 Ethanol 15-25 Deionized water Up to 100 and then in the second stage - 0.2-0.4% aqueous solution of resorcinol-formaldehyde resin SF-282 and drying at 100-150 ° C, while the flow rate of the composition in the first and second stages of processing of the reinforcement is 60-80 ml / m ² , respectively.