Method of attaching cured rubbers based on acrylate rubbers to metallic surfaces
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.
The invention relates to the development of the adhesive composition for attaching rubber to metal during vulcanization and can be used in the manufacture of rubber products for the automotive industry.
Know the use of carbofunctional organosilicon derivatives, in particular 3-aminopropyltriethoxysilane, for the preparation of adhesives and surface treatment (Lazarev GV, Sobolevsky MV, Rosenberg V.R. Carbofunctional organosilane and organosiloxane. Moscow: Chemistry. 1990, c.124; Novitskaya S. p., Nudelman Z.N., Dontsov AA Forecaster. Moscow: Chemistry. 1988, s). Such adhesives may contain resin (rezol, phenolic), 3-aminopropyltriethoxysilane (AGM-9), the solvent (methyl ethyl ketone). The water content of the organic solvent is methylethylketone (TU 6-09-782-76) limited regulatory document and does not exceed 0.8 wt.%. An organic solvent such adhesives is the main water - secondary. Upon dilution with methyl ethyl ketone water in such Klee significantly decreases the adhesive strength of the rubber to the metal.
Famous water company Henkel adhesives XW 7484 and XW7856, which is an aqueous dispersion, cholesteremia on the surface of the heated metal in a solid film (Y. Morozov, Reznichenko S. Recent advances in the chemistry and technology of elastomers. International con who erence on rubber and rubber IRC 98. Rubber & rubber, 1, 1999, p.46). Such adhesives comparable to systems containing the solvent, although somewhat inferior to them in strength of attachment of the rubber to the metal. However, for mounting rubbers on the basis of any of the elastomers and what their composition - no data (Beiersdorf D. Mount rubbers to metal with the help of middleware systems "Henkel". Rubber & rubber, 6, 1996, p.3 7...).
Known adhesives and adhesives for fastening rubber products based on acrylate rubbers to metal surfaces during vulcanization: Hemosil, which are a set of various soluble polymers, dispersed solids.
The composition of water-based glue VA-1 is a water-soluble phenolic resin, the polymer (polybutadiene) and dispersed solids. The concrete structure is not given.
Closest to the claimed method is adhesive composition (Golfarb VI, Lapaeva N.A., Gorban VI, Pichhadze SJ Patent No. 2180675. Adhesive composition, prototype), which is an aqueous adhesive for fluoride rubbers, suitable for mounting acrylate rubber to the metal surface of the valve cuff. The main disadvantage of the adhesive is necessary when it is used to observe the homogeneity of the composition, which is a set of various soluble polymers and dispersed solid substances the.
The technical result of the invention is to achieve a high strength acrylic rubber to the metal surface of the valve seals by separately applying two-component water-soluble adhesive composition with a low content of dry residue.
This technical result is achieved by the synthesis of adhesive directly on the surface of the reinforcement in the presence of AGM-9 and solution of water-soluble resorcinolformaldehyde resin SF-282.
The proposed method of attachment acrylate rubbers 2801 (base rubber Akron AR-740) and 2802 (base rubber Akron XF-5140) to metal surfaces of valves includes pre-processing the valve hydroalcoholic composition on the basis of AGM-9 and subsequent aqueous solution resorcinolformaldehyde resin SF-282. Drying temperature valve 100-150°at a flow rate of adhesive 60-80 ml/m2at each stage of processing valves, respectively.
Into a vessel was placed 20 g of ethyl alcohol, 3.5 g of IM-9 (TU 6-02-724-77) and 76.5 g of deionized water (model 3, table 1). Get clear solution No. 1. To use the solution onto the metal surface of the armature brush, dipping or spraying in one to three layers. Next put a 0.3%aqueous solution of SF-282 (resin resorcinolformaldehyde liquid brand SF-282, THE 6-07-402-9, Congo "Carbolite") - solution No. 2. Drying temperature valve 100-150°at a flow rate of adhesive 60-80 ml/m2at each stage of processing valves, respectively.
Durability of rubber with standard metal samples were evaluated according to THE 38.105-823-88 Details rubber for car Gas, KAMAZ and other plants". The standard specifications for rubber products - not less than 25 kgf/cm2for seals (oil seals).
Samples of the adhesive compositions shown in table 1, the strength characteristics in table 2. For tests used acrylate rubber mixture of the following composition:
1) the rubber mixture 2801 (per 100 mass parts of the rubber):
rubber Akron AR-740 - 100, sulfonate-powder - 3, zinc dimethyldithiocarbamate - 2, acetonyl R - 2, stearic acid - 2, black white BS-100 - 10, the micro-talc - 20, graphite - 20, carbon technical T-900 - 45;
2) the rubber mixture 2802 (per 100 mass parts of the rubber):
rubber Akron XF-5140 - 100, sulfonate-powder - 3, IM-9 - 2, stearic acid - 2, black white BS-100 - 30, micro-talc - 20, graphite, 2 - carbon technical T-900 - 45, wollastonite 20, diamine carbamate - 1, di-ortho-tolylguanidine - 2.
Samples tested adhesive compositions (weight%)
|Components||Clicks the set of technical documents|
|Solution No. 1|
|Solution No. 2|
|Resin resorcinolformaldehyde SF-282||0,1||0,5||0,3||0,2||0,4|
|Physical-mechanical testing of adhesive formulations (average of 5 samples)|
|Sample||Adhesive strength (kgf/cm2, rubber compound|
Testing of glue (adhesive) for attaching the rubber to the metal surface of the valve was carried out on fungi and directly on the part 2101-2402052-03 - packing of the rear axle gear with satisfactory results of experiments.
The method of processing metal surface fittings for attachment to her rubber-based acrylate rubber comprising the sequential processing of the valve in the first stage adhesive composition, wt.%:
and then in the second stage - 0,2-0,4%aqueous solution of d is orinformation resin SF-282 and drying at 100-150° With the flow rate of the first and second stages of processing armature is 60-80 ml/m2respectively.
FIELD: rubber industry.
SUBSTANCE: invention relates to manufacture of curable rubber compound based on acrylate rubbers used in fabrication of sealing rubber goods suited to be operated in contact with variable motor oils at temperatures to 150°C. Rubber compound is prepared by mixing acrylate rubber with components of compound. Consecutively added are: sodium or zinc stearate, stearic acid (release agent) and curing agent, namely 4,4'-diaminodiphenylmethane dispersed with sodium chloride in dioctyl phthalate, quaternary ammonium base, and, if necessary, mineral filler, carbon black, antioxidant, plasticizer, sulfur or magnesium oxide.
EFFECT: reduced relative residual compaction deformation with preserved stability of technological properties of rubber compound and cured products on storage and in processing.
7 cl, 2 tbl
FIELD: polymer materials.
SUBSTANCE: title polyamides possess also a good elongation capacity and a high thermo-mechanical strength. Object of invention is to obtain polyamides, which would be characterized by resistance to ageing under high working temperature conditions with their flexibility preserved. Disclosed composition contains (i) 60 to 99.5% (preferably 70-93%) of at least one copolyamide depicted by formula X/Y,Ar, wherein Y represents aliphatic diamine groups containing 8 to 20 carbon atoms; Ar represents groups of aromatic dicarboxylic acid; X either represents groups of aminoundecanoic acid H2N-(CH2)10-COOH, lactam-12 or corresponding acid or X represents unit Y.x, which is group resulting from condensation of diamine with aliphatic dicarboxylic acid (x) containing 8 to 20 carbon atoms, or X represents unit Y,I, which is group resulting from condensation of diamine with isophthalic acid; and (ii) 0.5 to 40% (preferably 7-30%) of at least one product selected from plasticizers, nano-fillers, polyolefins, cross-linked polyolefins, and additives. Preferably, X/Y,Ar represents: (1) 11/10,T resulting from condensation of aminoundecanoic acid, 1,10-decanediamine, and terephthalic acid, (2) 12/12,T resulting from condensation of lactam-12, 1,10-decanediamine, and terephthalic acid, (3) 10,10/10,T resulting from condensation of sebacic acid, 1,10-decanediamine, and terephthalic acid, or (4) 10,I/10,T resulting from condensation of isophthalic acid, 1,10-decanediamine, and terephthalic acid. Invention also provides apparatus, materials, and structures involving proposed composition.
EFFECT: improved performance characteristics of material.
27 cl, 4 tbl, 4 ex