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 minutes3. 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
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyesteramide resin cresol solvent, petroleum solvent, and tetrabutoxytitanium, said cresol solvent being the one recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
FIELD: polymer materials.
SUBSTANCE: insulating varnish for coating enameled wires contains polyester resin, titanium catalyst, and organic solvents, titanium catalyst being, in particular, tetrabutoxytitanium and organic solvents being petroleum solvent and cresol solvent recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.
EFFECT: lowered cost price of varnish and improved quality of finished product.
1 tbl, 9 ex
SUBSTANCE: there is disclosed insulating coating composition, containing bitumen in amount 90-100 wt fractions, fluorocarbon polymer 32 LN in amount 10-15 wt fractions, butyl acetate in amount 40-45 wt fractions, acetone in amount 40-45 wt fractions and mica in amount 2-3 wt fractions.
EFFECT: improved insulating properties, mechanical strength and chemical stability.
1 tbl, 1 ex
SUBSTANCE: varnish contains a varnish base, a functional additive which increases coating hardness, siccative HF and methyl ethyl ketoxime radical polymerisation inhibitor. The varnish base is an oligomer with strongly polar chromane rings. The oligomer is obtained by reacting tung oil and 101L phenol-formaldehyde resin, taken in equivalent ratio of 1:0.15-0.18, respectively, while heating said mixture for 60 minutes at temperature 160°C. After extracting water, temperature is raised to 182°C until achieving viscosity of 25-36 s. The oligomer is added to the composition in 50% xylene solution. The functional additive used is rosin ester with glycerine. Components are in the following ratio, wt %: oligomer - 31.0-36.2, rosin ester with glycerine - 9.0-3.8, siccative HF - 2.00, methyl ethyl ketoxime - 0.60, xylene - the balance.
EFFECT: wider raw material base, replacing molten amber, which is not produced on an industrial scale, with rosin ester with glycerine, high content of non-volatile substances, elasticity and electrical strength of the coating.
1 tbl, 2 ex
SUBSTANCE: invention relates to use of nanomaterials in wire enamel for improving thermal properties of enamel. The nanomodified wire enamels are usually used in making insulated winding wire. The polymer base of wire enamel is selected from a group comprising polyamideimide, polyester, polyesterimide, polyurethane and mixtures thereof. The nanomaterial is selected from a group comprising nano-oxides, metal nano-oxides, metal oxides or hydroxides of aluminium, tin, born, germanium, gallium, lead, transition metals, lanthanides, actinides and mixtures thereof. The nanomaterial is also selected from a group comprising nano-oxides, metal nano-oxides, metal oxides and hydroxides of aluminium, silicon, titanium, zinc, yttrium, vanadium, zirconium, nickel and mixtures thereof. After applying enamel on the wire and curing thereof, the wire exhibits improved thermal and mechanical properties.
EFFECT: improved thermal properties of enamel.
8 cl, 6 tbl
SUBSTANCE: invention can be used in producing wires with enamel insulation for motors, coils and transformers. The wire enamel contains binder, an organic solvent, auxiliary substances and additives, an adhesion promoter selected from imidazole, pyrrolidone, amidocarboxylic acids, derivatives thereof and mixtures thereof. The method of coating electric wires with the enamel involves providing an electric wire, applying the enamel and curing.
EFFECT: improved adhesion of the enamel to electric wires.
20 cl, 9 ex
SUBSTANCE: invention relates to production of electrically insulating lacquer for coating metal bases. Said lacquer contains (wt %): epoxy-diane resin 7-7.4, polyphenyltetraepoxy siloxane - 2.4-3, alkyd-epoxy resin VEP-0179 - 2.4-3.8, triethylamine - 0.16-0.28, acetone - 20.1-23.6, distilled water - the balance. To apply the lacquer onto a metal substrate, two electrodes - the article-electrode and an auxiliary electrode - are immersed in said lacquer. Positive potential is applied across the article-electrode relative the second auxiliary electrode and with current density of 0.2-1.5 mA/cm2 for 5-15 s, a dense homogeneous electrophoretic film-forming precipitate is electrically deposited on the article-electrode. The article is then placed in a heating cabinet for 30-50 s in which there is a vacuum of 50-60 torr and temperature of 30-40°C. The article is then held in a furnace for 1-1.5 min at temperature of 400-500°C.
EFFECT: inventions reduce emissions of harmful volatile substances, increase mechanical strength and breakdown voltage of the electrical insulation, enable to deposit a dense, homogeneous and quality film layer without using any mechanical devices.
2 cl, 1 tbl, 9 ex
SUBSTANCE: invention relates to obtaining electroinsulating varnishes for covering metal bases, for instance, copper wires, starter slots and electric motor armatures, conductors of printed circuit boards, etc. Method of application of electroinsulating coating on metal substrate includes preparation of electrophoretic composition based on varnish PE-939 of grade B, for which purpose it is mixed with 1% ammonia solution, ethylcellosolve and dioxane, after which into prepared electrophoretic solution submerged are two electrodes at distance 10-30 mm, one of which is electrode-product and the other is auxiliary electrode; positive potential relative to second auxiliary electrode is supplied to said electrode-product, and dense homogeneous electrophoretic sediment of film-forming is electrically precipitated on product at current density 2-10 mA/cm2 for 10-20 s, after that, electrode-product is removed from varnish, placed into heat chamber, 50-60 Torr vacuum and temperature 30-40°C are created in heat chamber, and electrode-product is kept at said temperature for 20-40 s, after that said electrode-product is removed from heat chamber and placed into oven, inside which temperature 350-450°C is created, and electrode-product is kept in oven for 60-90 s, after which electrode-product is removed from oven.
EFFECT: method provides increase of quality and exploitation reliability of insulating coating: specific volume resistance, resistance to chemical reagents, elasticity, electric and mechanical strength.
SUBSTANCE: invention relates to chrome-free material for an insulation coating of non grain-oriented electrical steel. Material contains the following components with the corresponding weight fractions: primary acid salt of metal of phosphorus acid in the volume of 100 fractions, epoxy resin in the volume of 10-60 fractions, a drying agent - naphthenate or a drying agent - salt of metal of isooctane acid in the volume of 0.001-10 fractions, an organic solvent in the volume of 0.001-100 fractions and clean water in the volume of 60-2000 fractions. As primary acid salt of metal of phosphorus acid there used is Al(H2PO4)3, Mg(H2PO4)2, Ca(H2PO4)2, Zn(H2PO4)2. As epoxy resin there used is water-soluble epoxy resin or an epoxy resin emulsion.
EFFECT: after chrome-free material of an insulation coating is applied to non grain-oriented electrical steel, it has highly transparent appearance, excellent insulation properties, corrosion resistance, adhesion ability, weldability and processibility, which eliminates demerits inherent in existing chrome-free coatings, for example adhesiveness and bad wear resistance, as well as meets environmental protection requirements.
5 cl, 4 tbl
SUBSTANCE: invention relates to electric engineering, and more specifically to compositions of insulating coatings and impregnation compounds for windings of electrical machines and mechanisms operated at high temperatures and intended mainly for application of coating by dipping. Impregnating insulating enamel includes polymethylphenylsiloxane lacquer, metal oxides, acrylate copolymer, butyl acetate, silicone antifoamer, rheological additive with thixotropic effect and aromatic solvent.
EFFECT: coatings are obtained with electric strength of enamel film at AC voltage (50 Hz) at temperature of 15-35°C and relative humidity of 45-75% equal to at least 60 kV/mm and specific volume resistance of enamel film in initial state at temperature of 15-35°C relative humidity of 45-75% equal to at least 1,0·1012 Ohm·cm.