Lacquer composition

Abstract

FIELD: radio engineering industry; instrument engineering; aviation industry.SUBSTANCE: invention relates to lacquer protective compositions and can be used in the radio engineering industry, instrument engineering, aviation industry, and other sectors of the national economy for the anti-corrosion protection of aluminum, copper, iron, and their alloys. A lacquer composition is proposed, including 0.6-1.10 g / l of 50% butanolized melamine-formaldehyde resin K-421-02, 0.6-1.10 g / l pentaphthalic varnish “ПФ-060”, 0.78-1.05 g / l triethylamine, 15.8-16.5 g / l resin “BMA”-0120, which is a solution in isopropyl alcohol hydrolyzed a product consisting of a maleinated mixture of linseed and dehydrated castor oils, 0.025-0.03 g / l of manganese sulfate and water up to 1 liter.EFFECT: invention provides a protective composition capable of forming a corrosion-resistant transparent coating on the surface of metals, while reducing the amount of solvents in the composition.1 cl, 2 ex

Description

[0001] The invention relates to protective varnish compositions and can be used in the radio engineering industry, instrument making, the aviation industry and in other areas of the national economy for the anti-corrosion protection of aluminum, copper, iron and their alloys.

[0002] A water-based varnish composition for applying coatings by electrodeposition is known in modern technology (SU 1764307 A1 IPC C09D 119 / 00, published 06 / 20 / 1996), comprising a 60-70% solution in a mixture of ethyl glycol acetate and butanol, partially neutralized with formic acid of an epoxy-amino rubber adduct iodified with melamine-formaldehyde resin, and water. In addition, it additionally contains acetic acid, carbonofluoride and diacetone alcohol or ethyl cellosol in the following ratio of ingredients, g / l:

[0003] 60-70% solution in a mixture of ethyl glycol acetate and butanol, partially neutralized with formic acid, of epoxy-amino rubber adduct modified with melamine-formaldehyde resin 225-275 Acetic acid 0,13-2,5 Carbonofluoride 12,5-50,0 Diacetone alcohol or ethyl cellosolve 12,5-62,5 Water rest

[0004] The disadvantage of this composition is the presence of a large number of solvents.

[0005] Also known is the "Composition for producing a coating by electrodeposition" (SU No. 691475, IPC C09D 5 / 40 published on 15.10.1979) comprising residrol, which is a maleated product of the reaction of a mixture of linseed and hydrated castor oils, glycerin and rosin with the addition of ionol, an organic solvent, triethylamine and water. Additionally, it contains 50% butanolyzed melamine-formaldehyde resin, pentaphthalic resin, polyethylene glycol ether of alkyl phenol and ammonium chromate in the following ratio of components, g / l:

[0006] Residrol 7,40-11,74 50% butanolyzed melamine formaldehyde resin 0,57-1,10 pentaphthalic resin 0,32-0,52 triethylamine 1,08-1,45 polyethyleneglycol ether alkylphenol 0,04-0,09 organic solvent 3,50-5,62 ammonium chromate 0,04-0,09 water rest

[0007] The disadvantage of this composition is the presence of chromium and a large amount of solvents.

[0008] The closest to the proposed technical solution is the "Composition for sealing products made of aluminum and copper alloys" (RU 2276176 C1, published 10.05.2006, IPC C09D 167 / 08), including residrol BA-133 based on a hydrolyzed adduct of maleic anhydride and a mixed glycerol ester of rosin and fatty acids of linseed and dehydrated castor oils, 50% butanolyzed melamine-formaldehyde resin K-421-02, pentaphthalic varnish PF-060, triethylamine and water, and additionally it contains manganese sulfate and xylene in the following ratio of components, g / l:

[0009] Residrol BA-133 15-16 Resin K 421-02 0,8-12 Pentaphthalic varnish PF-060 0,8-12 Triethylamine 1,5-1,9 Manganese sulfate 0,01-0,03 Xylene 0.3-0.5 ml / l Distilled water Rest pH 7,5-7,8

[0010] The disadvantage of “Composition for sealing products made of aluminum and copper alloys” is the large amount of solvents.

[0011] The technical result of the claimed “Varnish composition” is the creation of a protective composition capable of forming a corrosion-resistant transparent coating on the surface of metals, while reducing the amount of solvents.

[0012] The solution to the problem is achieved by the proposed varnish composition containing 50% butanolyzed melamine-formaldehyde resin K-421-02, pentaphthalic varnish PF-060, triethylamine, and water. New features that ensure the achievement of the stated technical result are the content of VMA-0120 resin, which is a solution in isopropyl alcohol of a hydrolyzed product consisting of a maleinized mixture of linseed and dehydrated castor oils, and manganese sulfate in the following ratio of components, g / l:

[0013] resin VMA-0120 15,8-16,5 resin K-421-02 0,6-1,10 PF-060 varnish 0,6-1,10 triethylamine 0,78-1,05 manganese sulfate 0,025-0,03 water up to 1 l

[0014] The claimed varnish composition is prepared as follows: K-421-02 resin and PF-060 varnish are added to VMA-0120 resin and mixed thoroughly at room temperature. The resin mixture is neutralized with triethyleneamine while stirring continuously. In a separate container, manganese sulfate is dissolved in distilled water and the resin mixture is slowly added while stirring vigorously. The solution is diluted with distilled water to the required volume and mixed until completely homogeneous.

[0015] Example 1.

[0016] Aluminum alloy products were protected from corrosion using a varnish composition of the following composition, g / l:

[0017] VMA-0120 resin 15,8 Resin K-421-02 0,6 Varnish PF-060 0,6 Triethylamine 1.08 ml Manganese sulfate 0,025 Distilled water up to 1 l pH of the composition 7,3

[0018] A coating of good quality in appearance was obtained.

[0019] The products have been tested for exposure to high temperatures of plus 85°C for 2 hours, low temperatures of minus 65°C for 24 hours, cyclic temperature changes from minus 65°C to plus 85°C (3 cycles), exposure to tropical humidity for 56 days (relative humidity 98±2% at a temperature of 35°C) and salt fog for 7 days (sodium chloride concentration 50 g / l).

[0020] After testing, the appearance of the varnish film remained unchanged, no metal corrosion was detected.

[0021] Example 2.

[0022] Corrosion protection of copper alloy products was carried out using a composition of the following composition, g / l:

[0023] VMA-0120 resin 16,5 Resin K-421-02 1,1 Varnish PF-060 1,1 Triethylamine 1.45 ml Manganese sulfate 0,03 Distilled water up to 1 l pH of the composition 7,8

[0024] A high-quality varnish coating was obtained, firmly adhering to the metal base. After testing under high humidity and sea fog (Example 1), the varnish film's appearance remained unchanged. No corrosion was observed.

Claims

A varnish composition comprising 50% butanolyzed melamine-formaldehyde resin K-421-02, pentaphthalic varnish PF-060, triethylamine and water, characterized in that it contains resin VMA-0120, which is a solution in isopropyl alcohol of a hydrolyzed product consisting of a maleinized mixture of linseed and dehydrated castor oils, and manganese sulfate in the following ratio of components, g / l: resin VMA-0120 15,8-16,5 resin K-421-02 0,6-1,10 PF-060 varnish 0,6-1,10 triethylamine 0,78-1,05 manganese sulfate 0,025-0,03 water up to 1 l