The composition for surface protection of metal products in local processing

 

(57) Abstract:

The invention relates to the insulation of the surfaces of metal products, mainly jewelry, at local, predominantly electrochemical and chemical processes, and is intended for use in the jewelry industry, instrument-making, machine-building and local industry. The composition contains, wt%: the copolymer of butyl methacrylate and methacrylic acid (the content of butyl methacrylate in the copolymer of 95 wt.%) 19,80-26,70; a copolymer of ethylene with vinyl acetate (vinyl acetate content in the copolymer 26-30 wt. %) of 0.85-1.00; toluene 14,50-15,80; butyl acetate 36,10-39,50; ethanol 7,20-8,00; butanol 14,50-15,80; organic dye 0,10-0,20. Technical result: developed and reproduced the composition for surface protection of metal products in local electrochemical and chemical processes, with high adhesion and electrical insulation properties and can be easily removed from metal surfaces after local processing. table 1.

The invention relates to the insulation of the surfaces of metal products, mainly jewelry, at local, predominantly electrochemical and chemical, the local industry.

Electrochemical processes impose compositions for protection (isolation) of the surfaces of metal products, with their local processing, a number of specific requirements. Such compounds must be resistant to the electrolyte and electric current in the layer of coating composition should not be point defects contributing to the penetration of electrolyte. Such compositions should also have good adhesion to metal products. In processing the protective compositions of jewelry, especially those produced by electroforming, it is necessary that the drying is carried out at room temperature and in a short time. After applying the plating removing composition should happen quickly and without thermal or mechanical impact on the product.

Known compositions for surface protection of metal products in their local processing, such as Capon-varnishes, based on nitrocellulose (1). Nitrocellulose lacquers do not meet the requirements of high adhesion to metal products.

Repeated application and require longer drying other known compounds such as bakelite or perchlorovinyl varnishes, as well as acid-resistant varnish surfaces of metal products with electrochemical and chemical processes on the basis of methacrylate-40, also containing adhesive leikonat, methyl ethyl ketone and toluene in the following ratio of components, wt.%:

Methacrylate - 41-45

Glue leikonat - 3-5

Methyl - 25-28

Toluene - 25-28

In this case, methacrylate-40 is used in the above composition as the insulating film-forming substances, glue leikonat being also electrically insulating film-forming substance used in the composition to improve adhesion, and the methyl ethyl ketone and toluene as solvents methacrylate.

The composition used in tool making, however, ineffective for a number of reasons for protecting surfaces such temporalities products as jewelry and similar items. Methacrylate-40 is a copolymer of butyl methacrylate and methyl methacrylate content of monomers, respectively, 40 and 60 wt.%, but does not contain any polar groups such as carboxyl, which impairs the adhesion properties of the protective composition to the metal workpiece, especially for precious metals and alloys. Glue leikonat, as is known from the literature and practice, is used for bonding rubber to metals, for which the rubber is subjected to heat-cured, but C is haunted properties of the adhesive lacunata, obviously, you are not able. The viscosity of the composition is too high and is VZ-4 150 C, which affects all of its major properties.

The task that sent the invention is to provide a composition for surface protection of metal products, including precious metals, for local processing, mainly electrochemical and chemical having a high adhesive and insulating properties remaining in the drying conditions at room temperature and can be easily removed from metal surfaces after local processing of products.

This object is achieved due to the fact that the composition for surface protection of metal products in local electrochemical and chemical processes contains insulating film-forming substances, one of which is the connection on acrylate basis, and organic solvents, one of which is toluene, and the composition further comprises an organic dye, and as a connection on acrylate-based copolymer of butyl methacrylate and methacrylic acid, as the insulating film-forming substances is ol in the following ratio of components, in wt.%:

The copolymer of butyl methacrylate and methacrylic acid (the content of butyl methacrylate in the copolymer is 95 wt.%) - 19,80-26,70

A copolymer of ethylene with vinyl acetate (vinyl acetate content in the copolymer - 26-30 wt.%) - 0,85-1,00

Toluene - 14,50-15,80

Butyl acetate - 36,10-39,50

Ethanol - 7,20-8,00

Butanol - 14,50-15,80

Organic dye - 0,10-0,20

The proposed structure has high adhesiveness to metal surfaces, because all acids contain polar, in this case, the carboxyl group.

Necessary electrical characteristics of the composition offers high electrical resistivity initial film-forming substances. So vcopolymer of butyl methacrylate and methacrylic acid (copolymer BMC - 5. OST 6-01-75) is (1,08-1,38)1013Mme andvcopolymer of ethylene with vinyl acetate (Savile, THE 301-05-56-90) is in the range 1017-1018Homme, at that time, as film-forming closest analogue (methacrylate-40) has a resistivityvonly in range (0,9-3,4)1012Homme.

Organic dye, such as Rhodamine 6G, enables visual controlremote. As the organic dye in addition to basic colors with colored cations, which include Rhodamine 6G can be used dyes, soluble in alcohols, fats, esters, and other similar organic solvents (for example, fat-soluble anthraquinone blue, Burgundy alcohol C and others).

Drying time at room temperature caused a protective composition is within 5-10 minutes With a layer of the composition is smooth, which can not be achieved by applying the composition - the closest analogue, because almost the same volatility used solvents.

The technical result of the invention is to achieve the target is not achieved using the nearest analogue, namely: developed and reproduced the composition for surface protection of metal products in local electrochemical and chemical processes, with high adhesion and electrical insulation properties and can be easily removed from metal surfaces after local processing, which is also confirmed by table N 1 (Properties of protective structures depending on the availability of and relationship with local processing poverhnosti NN 1-10, and the composition N 1 corresponds to the nearest analogue compositions NN 2-6 composition of the invention and compositions NN 7-10 violating the ratio of components according to the invention. The table shows that the best to achieve the objectives of the invention, the property has a composition N 5 (see also "Example of a specific application and enforcement of composition"), and the output of the regulated limits leads to deterioration of the properties of the composition, and makes it generally unsuitable for use.

An example of a specific application and enforcement staff.

1. The manufacturer of the protective composition (see example No. 5 table No. 1). In a mixer with a capacity of 1.5 l was introduced 155,5 g (179 ml) of toluene, 361 g (410 ml) of butyl acetate, to 74.5 g (94 ml) of ethanol, 149,8 g (184 ml) of butanol and 2.0 g of Rhodamine 6G (organic dye). The mixing of these components produced during 1,0 min, found a container in a water bath with t= 40-50oC and, under stirring, in portions introduced into the obtained colored red, solvent mixture of 248 g of a copolymer of butyl methacrylate and methacrylic acid and 9.2 g of a copolymer of ethylene with vinyl acetate. As part of the state of homogeneity, it was cooled to room temperature (20-La the local gold plating was used brooch made of low-melting alloy of tin, lead and antimony.

The brooch was applied over the Nickel layer of silver. Before applying a protective composition for local gold plating and cyanide electrolyte surface was degreased with ethanol, dried at room temperature, after which the areas not to be gilded, caused by brush protective structure in two layers. The drying time of each layer at room temperature was 10 minutes

3. Processing object after applying a protective composition and drying.

After drying the product was subjected to electrochemical degreasing solution containing 30 g/l Na3PO4, Na2CO3and NaOH at room temperature and U 4 for 1,0 min, washed with water t 40oC, then the product was decipherable in 50% hydrochloric acid solution, washed in cold water and subjected to a local plating cyanide electrolyte for Dk= 0,6 A/DM2in the course of 3.7 minutes the product is Then removed from the bath, washed with water and dried. The amount of protective coating made by washing in acetone.

As a result of gilding were only specified areas of products, the protective layer was not electrically is called after previous operations.

The positive results of the use of the compositions according to the regulated intervals of components that are directly related to the fact that the viscosity is within their (B3-4) 60-94 C.

The invention for its use does not require expensive equipment, optional equipment, critical materials and components.

The proposed composition and process of its manufacture and use can be easily and repeatedly reproduced in industrial production.

Sources of information taken into account in the development of an invention.

1. Galvanic coatings in engineering. Handbook Ed. by M. A. Shluger M., engineering, 1985, T. I, pp. 89-90.

2. Ginberg A. M. electroplating, Sudpromgiz, 1965, S. 46-47,

3. USSR author's certificate N 1601224, IPC 5 C 25 D 5/02, B. I. N 39 from 23.10.90.

The composition for surface protection of metal products in local electrochemical and chemical processes containing insulating film-forming substances, one of which is the connection on acrylate basis, and organic solvents, one of which is toluene, the balance of the th basis contains a copolymer of butyl methacrylate and methacrylic acid, as the insulating film-forming agent is a copolymer of ethylene and vinyl acetate, and the organic solvents butyl acetate, ethanol and butanol in the following ratio, wt.%:

The copolymer of butyl methacrylate and methacrylic acid (the content of butyl methacrylate in the copolymer is 95 wt.%) - 19,80 - 26,70

A copolymer of ethylene with vinyl acetate (vinyl acetate content in the copolymer - 26 - 30 wt.%) - 0,85 - 1,00

Toluene - 14,50 - 15,80

Butyl acetate - 36,10 - 39,50

Ethanol - 7,20 - 8,00

Butanol - 14,50 - 15,80

Organic dye - 0,10 - 0,20 about

 

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