Electrical steel coating method

FIELD: metallurgy.

SUBSTANCE: electrical steel coating method using lacquer composition for charged core involves application at least of one coating layer of lacquer composition and curing of the applied layer. Lacquer composition for charged core contains 5-95 wt % at least of one alkyd resin with OH nucleophilic groups, 0-70 wt % at least of one polyamid resin containing groups of amide of α-carboxy-β-oxocycloalkylcarboxylic acid, and 5-95 wt % at leas of one organic solvent and/or water. Weight fraction in percents is calculated relative to total weight of the coating composition.

EFFECT: method ensures excellent adhesion and corrosion resistance of coatings, as well as compliance with high-profile standards in combination with various technical requirements.

10 cl, 3 tbl

 

The technical field

The present invention relates to a method for coating electrical steel using a varnish composition for laminated core based on the new polyetheramine imides, polyester imides and provide excellent adhesion of the coatings.

Background of invention

Known varnishes for electrical steel sheet to cover the individual steel plates. Coated electrical steel sheets can be collected together various technical means, such as welding, bonding, Assembly perekrasku, casting aluminum crimp parts or riveting with the formation of a solid core for use in electrical equipment such as transformers, generators and motors. Coatings provide electrical isolation between the metal sheets in the core and must meet the requirements of high insulation resistance surface resistance to mechanical stress and corrosion and thermal stability.

Patents Japan 07336969, 2000345360 and patent EP-A 923 088 refer to enamels for coating electrical steel sheet, where the enamel contain particles such as silica or colloidal particles of aluminum oxide. The obtained composition of the coatings have properties, such as good resistance to scratching, nl is the freezing, chemical attack and corrosion and high isolation surface. Such coatings do not have the function of binding and require additional means for bonding (welding, bonding, Assembly perekrasku, casting aluminum crimp parts or riveting) with the formation of massive core.

There are known systems coatings used for coating electrical steel sheet, suitable for welding or perforation to receive a massive core. With this in mind, the choice of nail laminated core is often a compromise, because there are cases where a single-layer coating does not meet all requirements. Known item classes such coatings, for example, class C3, class C5, class C6 (registered as the standards in the classification system AISI-ASTM A 976-03) show the different requirements of the coatings in this area in respect of such properties. The coating may be a mixture of organic compounds (floor insulation type C3) or a mixture of organic/inorganic complex compounds resins and chromate, phosphate or oxide (insulating coating type C5 and C6).

Apply coatings C3 based on organic resins, such as phenolic, alkyd, acrylic and epoxy. Floor C3 enhances the ability to perforation and steadily during normal who's operating temperature, but can not withstand annealing stress. In General, the coating C5, on the one hand, can be preorganization coated with a very good ability to perforation and good response for welding, and on the other hand, can be almost inorganic coating with an organic resin and inorganic filler, which has excellent properties when welding and thermal stability in combination with good ability to perforation. However, coverage C5, mainly based on the compounds of chromates, phosphates or titanates, which are not considered safe for the environment, in particular, in relation to a residual level of carcinogenic compounds, or they tend to be hygroscopic and poor resistance to annealing and corrosion, or show poor welding properties. Cover C6 are organic coatings with high filler content of approximately 50 wt.%.

Known systems are not able to combine different technical requirements, such as resistance welding, riveting, weave, perforation, skladyvaniyu, pressure and heat stability to ensure excellent properties of high standard.

Known reaction system based on the reaction product with ethyl-alpha-carboxy-beta-cyclopentanediol to obtain coatings to protect the t corrosion (see the patents DE-A 10260299 and DE-A 10260269). Patent WO 2007/019434 discloses a composition for coating wire based on special resins to significantly increase the speed of enamelling. Such coatings do not satisfy the properties required for electrical steel, because, in particular, coating systems based on melamine resins and/or polyol/isocyanate can be brittle coatings, as well as unwanted emission of low molecular weight products that are hazardous to health.

The invention

This invention provides a method for coating electrical steel using a varnish composition for a laminated core, comprising the steps

a) applying at least one layer of a coating varnish composition for laminated core to the surface of the electrical steel, where the composition of the lacquer coating the core layer includes

(A) 5-95 wt.%, at least one resin with nucleophilic groups selected from the group consisting of OH, other, SH, carboxylate and CH-acidic groups,

(B) 0-70 wt.%, at least one resin containing an amide group, and

(B) 5-95 wt.%, at least one organic solvent and/or water,

however, any resin component (a) and/or component (B) contain amide α-carboxy-β-oxocyclohexanecarboxylic acid, and the mass fraction of Yes is rather relative to the total weight of the composition of the coating, and

b) curing the applied layer.

The method according to the invention provides excellent adhesion of the coatings to the surface of the electrical steel, as well as a surprisingly high resistance to corrosion coatings and good electrical insulation. Coverage provided by the method according to this invention exhibit properties that correspond to the highest standards in combination with different technical requirements, such as welding, riveting, Assembly perekrasku, screed, skladivanie, resistance to high pressure and temperature of the electrical steel sheets coated with the composition according to the present invention and cores obtained from this coated electrical steel sheet. Coatings provide better adhesion and mechanical properties than coatings that exist in this area. There is an opportunity to provide a very thin coatings in the range of 1 micrometer in combination with excellent adhesion and corrosion resistance. The coating composition used in this method according to the invention is used as one-component system.

Detailed description of the invention

Technical characteristics and advantages of the present invention will be understood by a person skilled in the art after reading the following detailed description. Should PR shall take into account the fact that what those certain properties of the invention, which for a clear understanding of the above and below in the context of separate embodiments of the invention can be obtained in combination in a single implementation. Conversely, various technical features of the invention, which, for brevity, described in the context of a variant of implementation, can also be obtained separately or in the form of partial Association. In addition, references to the singular may also include the plural (for example, a single number may also refer to one or to one or more), unless the context specifically stated otherwise.

Minor fluctuations in the direction of increase and decrease within the above ranges can be used to achieve essentially the same results as using values within such ranges. In addition, the disclosure of these ranges is provided in the form of a continuous range, covering any value between the minimum and maximum values.

The coating compositions of the coating method according to this invention is carried out, for example, by spraying, rolling rollers or glazing by dipping the surface of one or both sides of the electrical steel.

Surface Electrotech the standard steel for example sheet steel, may be covered or uncovered before applying according to stage a) according to the method of the invention. The leaves can be pretreated, for example, by washing to remove dirt, grease and other precipitation. Preferably use pre-washed and uncovered electrical steel sheets, coated with the composition according to the invention, preferably a single-layer coating.

Consistently occurs cross-linking (curing) coating of steel sheet by heat under certain conditions, curing, preferably at temperatures of providing MMT (peak metal temperature) in the range of 180-270°C, preferably 230-260°C. Temperature curing can be, for example, in the range 200-600°C, preferably 300-450°C, over a period of time of 10 seconds to 1 minute, preferably 10-40 seconds. Temperature curing may also be, for example, in the range 100-300°C, over a period of time, for example, 60 to 120 minutes. The required heat can provide, for example, in a furnace by induction heating, infrared radiation (IR), near infrared radiation (NIR) and/or hot air.

After curing, you can cut part of the coated steel sheet and then wrap each other and to assemble to obtain charge of the pot core various technical means such as welding, bonding, Assembly perekrasku, casting aluminum crimp forms or riveting, preferably by welding, if necessary providing heat and pressure.

Therefore, this invention is also directed to a method of obtaining cores of electrical sheet steel.

It is possible to apply the composition according to this invention in the form of a composition of the coating is water-based or solvent-based.

Examples of the component (A) are resins such as the polymethacrylates, polyurethanes, alkyd resin, epoxy resin, polyester resin, polyester amides/imides, silicone resins, polyolefins, polyvinyl alcohols, complex polytitanate. Production of resin component (A) is known from the literature (see, for example, Behr, “Hochtemperaturbeständige Kunststoffe” Hanser Verlage, Munich 1969; Cassidy, “Thermally Stable Polymers” New York: Marcel Dekker, 1980; Frazer, “High Temperature Resistant Polymers”, New York: Interscience, 1968; Mair, Kunststoffe, 77 (1987) 204).

Can be used on polyurethane resin as the component (A), for example aliphatic polyurethane resin with a high acid number (mg KOH/g solid resin) in the range 18-33 and a hydroxyl number (mg KOH/g solid resin) in the range of 100-170. The average molar mass Mnthe polyurethane resin may be, for example, 13000-25000.

You can also use polyester resin as component (A), frequent in the spine of the polyesters with a nitrogen-containing heterocyclic rings, for example polyesters with imide, as, benzimidazole, amidon and/or amide and/kidnie patterns, condensed into the molecule. Polyesters are, in particular, the condensation products of polybasic aliphatic, aromatic and/or cycloaliphatic carboxylic acids and their anhydrides, polyhydric alcohols and, in the case mesotelioma polyethers, polyesters with compounds containing amino groups, optionally, with proportional parts of monofunctional compounds, for example, monohydroxy alcohols. Saturated polyester imides are preferably based on the polyester of terephthalic acid, which may also contain polyols and, as an additional component of dicarboxylic acid, the reaction product of diaminodiphenylmethane and anhydride trimellitic acid in addition to dilam.

In addition, it is also possible to use unsaturated polyester resin and/or polyester imides, and polyacrylates.

Other resins may be used as component A), such as epoxy resin, for example, based on bisphenol A or bisphenol F, phenol resin, melamine resin, polymethacrylates imide, polyimide, polybismaleimide imides, polyester imides, polybenzoxazole diones, polyvidone, polyvinylformal, polyacrylates and their derivatives, polyvinylacetal and/or mask is consistent isocyanates.

Zameshivanie resin can be used in addition to the resin component (A), such as, for example, epoxy novolak resins, and is also known epoxy hybrid resins, such as urethane-modified epoxy resins, acrylic-modified epoxy resins and epoxy esters, in an amount in the range of 0-10 wt.% relative to the total weight of the composition of the coating.

Preferably the use of epoxy resins based on bisphenol a or bisphenol F as component A).

The resin component (B) may contain amides of α-carboxy-β-oxocyclohexanecarboxylic acid. Amide group, α-carboxy-β-oxocyclohexanecarboxylic acid preferably include in the final position. The above-mentioned α-carboxyl groups are alkyl - or aryl-esterified. Amides of α-carboxy-β-oxocyclohexanecarboxylic acids of this type can be obtained, on the one hand, from the corresponding carboxylic acid or its reactive derivatives of these products, such as the group of halides of carboxylic acid groups, anhydrides of carboxylic acids or similar groups formed by reaction with aminovymi groups. During synthesis with the use of amine and carboxylic acid, it is advisable to use an auxiliary lidirujuwie substances, such as dicyclohexylcarbodiimide. α-β-oxocyclohexyl carboxylic acid, in turn, can be obtained, for example, in the reaction with esters acid rehalogenating derived methane in basic conditions and subsequent selective saponification. 1-carboxyl-2-oxacyclobutane can, in turn, be obtained synthetically, for example, from esters 1,n-dibasic carboxylic acid in the reaction with bases, obtained after cleavage of alcohols. On the other hand, mentioned amides of α-carboxy-β-oxocyclohexanecarboxylic acid can also be obtained in the basic conditions in the reaction mentioned 1-carboxyl-2-oxocyclohexyl with isocyanates. These 1-carboxy-2-oxacyclobutane can be obtained, for example, from dialkylamino esters of glutaric acid, girilovich esters of glutaric acid, dialkylamino esters of adipic acid, girilovich esters of adipic acid, dialkylamino esters pipelinewall acid, girilovich esters pipelinewall acid, dialkylamino esters octane dibasic acid, girilovich esters octane dibasic acid and alkyl-, aryl-, alkoxy-, aryloxy, alkylcarboxylic, arylcarboxylic-, halogen - and other derivatives of these products, particularly preferably obtain this product from the complex of dimethyl and ethyl esters of adipic acid.

The above-mentioned isocyanates, for example, can b the th propylenediene, trimethylindolenine, tetramethyldisilane, pentamethyldisiloxane, hexamethylenediisocyanate, ethylethylenediamine, 3,3,4-trimethylhexamethylenediamine, 1,3-cyclopentadiene, 1,4-cyclohexyldiamine, 1,2 - cyclohexyldiamine, 1,3-delete the entry, 1,4-delete the entry, 2,5-silenciosamente, 2,6-silenciosamente, 4,4'-biphenylenediisocyanate, 1,5-naphthylenediisocyanate, 1,4-naphthylenediisocyanate, 4,4'-diphenylmethanediisocyanate, 2,4'-diphenylmethanediisocyanate, polycyclic isocyanates, resulting from the reaction of aniline, formaldehyde and COCl2functionality which is higher than that of 2,4,4'-dicyclohexylmethane, 2,4'-dicyclohexylmethane, isophorondiisocyanate or triisocyanate or oligomers and polymers derived from these isocyanates (for example, Orlandini, isocyanurate or similar substances).

You can use the excess urethane or urea derived from the above isocyanates, which receive, for example, in the reaction with ethylene glycol, propylene glycol, butanediol, 1,3-propane diol, hexanediol, neopentylglycol, trimethylolpropane, glycerin, pentaerythritol and other dialami, triolisme, tetralani, polyols or also with aminoalcohols, diamines, triamine and polyamines.

The above is used for amidation amines can be aliphatic primary diamines, as Ethylenediamine, Propylenediamine, tetramethylaniline, pentamethylenebis, hexamethylenediamine were such a cycloaliphatic diamines as 4,4'-dicyclohexylmethane, or even triamine, and also possible to use secondary amines. To the above amines can also include aromatic amines such as diaminodiphenylmethane, phenylenediamine, polycyclic aromatic amines with functionality higher than 2, stillbelieve or their respective derivatives. Is also possible to use amines with functional extension group in the molecule, for example, aminoalcohols such as monoethanolamine and/or monopropylene, or amino acids such as glycine, aminopropionic acid, aminocaproic acid or aminobenzene acid and esters derived from these products.

Amides of α-carboxy-β-oxocyclohexanecarboxylic acid may also be included directly in the component (A). This can be achieved, for example, through reaction of the resin component (A) with di - or polyisocyanates and at least one of carboxyl-β-oxacyclobutane.

If the composition contains component B), preferably component B)containing amide α-carboxy-β-oxocyclohexyl carboxylic acid.

As component C), the composition may contain water and/or the Dean or more organic solvents, such as aromatic hydrocarbons, N-organic, Cresols, phenol, Xylenol, carbonaceous, sterols, vinyltoluene, methylacrylate, aliphatic alcohols.

In addition, the composition of the varnish core steel sheet according to the invention may contain cross-linking agents, known for coating electrical steel, for example, phenolic resins, melamine resins, block polymers, isocyanates, epoxy resin.

Conventional additives and auxiliary substances known to the person skilled in the art may also be used in the coating compositions used in this method, for example, diluents, plasticizers components, curing accelerators, for example metal salts, substituted amines, catalysts, such as tetrabutyltin, isopropylidene, cresol-titanate, their polymeric forms, dibutylthiourea tin, initiators, for example photoinitiator, the initiators to the reaction to heat stabilizers, such as hydrochinone, quinones, ALKYLPHENOLS, alkylphenol esters, prepodavatel and flowability improvers, when the content is 0-10 wt.%, preferably 0.1 to 10 wt.%, relative to the total weight of the composition of the coating.

The coating composition may also contain particles measured in nanometers, an average size of which is in the range from 1 to 300 nm, preferably in the range from 2 to 80 nm. These include,for example, inorganic nano-particles on the basis of such compounds as silicon dioxide (SiO2), aluminum oxide (Al2O3), titanium dioxide (TiO2), boronitride, silicon carbide. Particles may represent, for example, compounds with a spatial structure, which includes elemental oxygen, which includes elements of the set consisting of silicon, zinc, aluminum, tin, boron, germanium, gallium, lead, the transition metals and the lanthanides and actinides, in particular of the set consisting of silicon, titanium, zinc, yttrium, cerium, vanadium, hafnium, zirconium, Nickel and/or tantalum. Applicable particles are, for example, colloidal solutions, or suspensions of such particles as silica, alumina, titanium oxide, preferably colloidal silica, which is commercially available from, for example, Nyacol®Corp., Grace Davison (Ludox®the colloidal silica in water), Nissan Chemical. The surface of the particles with the structure containing elemental oxygen, can be modified chemically active organic groups as described, for example, in patent EP-A 1166283. Examples of suitable reactive particles are products Aerosil from Degussa AG, preferably Aerosil®R 100-8000. The surface of the particles with the structure containing elemental oxygen, can also be modified chemically inactive groups, partially is about or fully. Compounds of this type can contain, for example, in the amount of 0-70 wt.%, preferably 0.1 to 70 mass%, in the composition according to this invention.

The coating composition can contain pigments and/or fillers, for example, based on SiO2, Al2O3, TiO2, Cr2O3for example, inorganic to give the color and/or organic pigments, such as titanium dioxide or carbon black, and providing such effect pigments such as pigments based on metal flakes and/or pearlescent pigments in the number of 0-60 wt.%, preferably 0.1 to 60 wt.%, relative to the total weight of the composition of the coating.

The coating composition may further comprise Monomeric and/or polymeric organic compounds. Examples of polymeric ORGANOMETALLIC compounds are inorganic-organic hybrid polymers, such as those mentioned in patent DE-A 198 41 977. Examples of Monomeric ORGANOMETALLIC compounds are esters orthotitanate acid and/or esters orthocarbonic acid, such as nonyl, cetil, stearyl, triethanolamine, diethanolamine, acetylacetone complex acetoacetic ether, tetraisopropyl, cresyl, tetrabutyltin and lead zirconate, and tetradactyl titanium, others and silicon compounds, for example, garnetttribute and tetraethylsilane and/or different silicone resin. For more polymeric and/or Monomeric ORGANOMETALLIC compounds of this type can be included in the compositions according to the invention, for example, in the amount of 0-70 wt.%.

Therefore, the coating composition used by the method according to this invention may be a composition including

(A) 5-60 wt.%, at least one resin with nucleophilic groups selected from the group consisting of OH, other, SH, carboxylate and CH-acidic groups,

(B) 1-50 wt.%, at least one resin containing amide groups,

(C) 5-90 wt.%, at least one organic solvent and/or water,

(D) 0-10 wt.% and preferably 0.1 to 10 wt.% commonly used additives and auxiliary substances,

(D) 0-70 wt.% and preferably 0.1 to 70 wt.% nanoparticles and

(E) 0-60 wt.% and preferably 0.1 to 60 wt.% traditionally used fillers and/or pigments,

however, any resin component (a) and/or component (B) contain groups of amides of α-carboxy-β-oxocyclohexanecarboxylic acid, and the mass fraction is given relative to the total weight of the composition of the coating.

Preferably, the resin component (B) may contain groups of amides of α-carboxy-β-oxocyclohexanecarboxylic acid.

The composition according to this invention can be obtained by simply mixing the individual components together, for Example, it is possible to obtain a dispersion of resin by mixing the resin component (A) with water. Subsequently add additional components, for example, with shaking to obtain a stable dispersion, optionally using heat and dispersing agents. It is also possible to obtain the mixture of the resin with an organic solvent. Then add the following components, for example, with stirring.

Water or organic solvents as component C) is added in such a quantity to achieve solids, for example, 30-60% in the final composition.

The coating compositions according to the method according to this invention is carried out, for example, on the surface of one or both sides of the electrical steel sheet in the form of one or more layers with a layer thickness in a dry form, for example, 0.1 to 30 μm, preferably 0.2 to 20 μm on the layer.

In particular, the composition according to the invention are suitable in the form of a single layer application.

Further, the present invention is explained in the following Examples. It should be understood that these examples are provided for illustration only. In the present invention is not limited to the illustrative examples set forth below, as determined by the claims contained later in this document.

Examples

Example 1

Obtaining C3, C5 and C6 insulating varnish according to the invention

Insulating varnish composition is shown in Table 1, were obtained from the phenol-modified alkyd resin (with nucleophilic Oh groups) with a solids content 68-75 wt.% in a mixture of water and an organic solvent. Polyamide resin contains at least two amide groups in the molecule α-carboxy-β-oxocyclohexanecarboxylic acid. It is added in the form of a solution with a solids content 48-52% of a mixture of water and an organic solvent. As the inorganic filler used kaolin with a solids content of 100 wt.%. After this exercise supplementation (prepodavatel, a catalyst, a wetting agent, corrosion inhibitor and pigment, as well as butyrophenones as organic solvent and/or water. For the adjustment of pH using dimethylethanolamine. The mixture was mixed and crushed to homogeneity.

TABLE 1
ComponentThe amount in wt.%
Approx. C3
Insulation class
according to ASTM-A976-03
Approx. C5
Insulation class
according to ASTM-A976-0
Approx. C6
Insulation class
according to ASTM-A976-03
The phenol-modified alkyd resin with a nucleophilic Oh groups (solids content 68-75 wt.% in a mixture of water and organic solvent)685529
Polyamide resin with two amide groups in the molecule α-carboxy-β-oxocyclohexanecarboxylic acid (solids content 48-52% in a mixture of water and organic solvent)1713,75
Water/Buyprovigil14164
Filler kaolin-1255
Pigments0,40,32
Supplements0,635
100100100

The coating compositions containing the components listed in Table 1 was coated steel with oriented grains to obtain the insulating layer with a film thickness in a dry form of 1 μm (±0,5). Used sheet steel with a surface roughness Ra less than or equal to 0.5 μm. To apply varnish to the sheet steel used roller. The applied film was utverjdali when LSM (peak metal temperature) 180°-270°C and cooled in the atmosphere.

Example 2

Obtaining C3, C5 and C6 insulating varnishes according to the existing level of technology

Insulating varnish composition is shown in Table 2, were obtained from the phenol-modified alkyd resin (with nucleophilic Oh groups) with a solids content 68-75 wt.% in a mixture of water and an organic solvent. As the inorganic filler used kaolin with a solids content of 100 wt.%. The melamine-formaldehyde resin, which was partially methylated, with a solids content of 90-99 wt.% used as cross-linking of the binder. After this was carried out by the introduction of additives (prepodavatel, a catalyst, a wetting agent, corrosion inhibitor and pigment, as well as butyrophenones as organic solvent and/or water. For the adjustment of pH used dimethylethanolamine. The mixture was stirred and who was smallscale to homogeneity.

TABLE 2
Component on the existing level of technologyThe amount in wt.%
Prims
Insulation class
according to ASTM-A976-03
The existing level of technology
Prims
Insulation class
according to ASTM-A976-03
The existing level of technology
Prims
Insulation class
according to ASTM-A976-03
The existing level of technology
the phenol-modified alkyd resin with a nucleophilic Oh groups (solids content 68-75 wt.% in
a mixture of water and organic solvent)
504125
The melamine-formaldehyde resin, partially methylated (solids content 90-99 wt. %)126,95
Water/Buyprovigil36,536,17
Filler kaolin- 1055
Pigments0,422
Supplements1,146
100100100

The coating compositions listed in Table 2, was applied and utverjdali on the electrical steel sheets using the same methods and under the same conditions as described in Example 1. Also used the same method for making sheet steel core as in Example 1.

Example 3

Test

Technological properties of new coatings C3, C5 and C6 according to this invention are presented in Table 3 in comparison with those for the existing level of equipment as standard.

Coated steel sheets were tested according to the common or internal standards. The third line of Table 3 shows the test of resistance to solvent by double wiping solvent with a load of 1 kg until then, until you have done 30 double proteranii. Test of resistance to the solvent acetone also showed properties utverzhdenii dry film. Line 9 shows the resistance to the abrasive action of using the device, developed by DuPont. Spent determining the amount of dust formed between the coated steel sheets after 30 dual friction with a load of 5 kg At line 11 shows the quality of the weld seam formation without swelling and ash, according to the test report SEP 1210 for sample steel-iron.

These results show that the coatings according to this invention provide superior curing, adhesion and insulation surface with a film thickness of 0.5-10 μm. In addition, the corrosion resistance of the coatings according to this invention is improved compared with the coatings on the existing level of technology. Welding tungsten electrode argon-arc welding (TIG) electrical steel coated according to this invention, has improved for C3 and C5 compared to the films on the existing level of technology. Coating of the present invention show excellent properties in terms of resistance to scratching and abrasion rate in the corresponding class of insulation, which indicates that the film will be barely noticeable traces of friction and scratches after cutting or punching compared with the film on the existing level of technology.

TABLE 3
Properties of the coatingApprox. Insulation class
C3
Approx. Insulation class
C3
There is the overall level of technology
Approx. Insulation class
C5
Approx. Insulation class
C5
There is the overall level of technology
Approx. Insulation class
C6
Approx. Insulation class
C6
There is the overall level of technology
1. The thickness of the coating in dry form [µm]0.5 to 30.5 to 30.5 to 30,5-23-103-10
2. Curing rate [sec]
(oven Matisse at a temperature of 300°C
PTM 200°C-250°C)
25302530-353035
3. Resistance to treatment with a solvent 30 times with acetone and ethanolpositivelypositivelyPositivelypositivelypositivelyPolo is sustained fashion
4. Adhesiveness when nadele device with a set of disks with a size of 2 mm ISO 2409000000
5. The resistance to scratching of up to 2 µm [%]
ISO 1518
100801008010080
6. Corrosion resistance Test salt spray according to DIN EN ISO 9227
Assessment of corrosion of the surface [%]
<40
(3 μm/24 h)
60
(3 μm/24 h)
<50
(1 μm/5 h)
100
(1 μm/5 h)
<20
6 μm/24 h
40
6 μm/24 h
7. Insulation resistance surface
Omsm2/μm
ASTM A 717-06
>80
(3 µm)
>60
(3 µm)
>70
(2 µm)
>50
(2 µm)
>1500
(5 microns)
>1500
(5 microns)
8. Insulation surface of th the annealing DIN IEC 60404-12 nono3-72-4nono
9. Resistance
abrasiveness under a load of 5 kg [mg]
<0,5<1,0<1,0>1,5<1,5>2
10. The behavior of the electrical locking facility [%]10010010090nono
11. TIG welding tungsten SEP 1210
Load of 160 N/cm2
speed: 600 mm/min
there is no swelling/no ash=100%
3-4 bubble/no ash=90%
3-4 bubble/ash =80%
100010090nono
12. Stability under load (shrinkage package is 160°C/500 hnono the nono<0,4%<0,7%
13. Potriveste [%]100100100100100100

1. Method of coating electrical steel using a varnish composition for a laminated core, comprising the steps
a) applying at least one layer of a coating varnish composition for laminated core to the surface of the electrical steel, with a lacquer composition for laminated core contains
(A) 5-95 wt.%, at least one alkyd resin with nucleophilic groups HE,
(B) 0-70%by weight, at least one polyamide resin containing amide groups of α-carboxy-β-oxocyclohexanecarboxylic acid, and
(B) 5-95 wt.%, at least one organic solvent and/or water, with
mass percentage is calculated relative to the total weight of the composition of the coating, and
b) curing the applied layer.

2. The method of coating according to claim 1, which is applied at least one layer of a coating varnish composition for laminated core, including
(A) 5-60 wt.%, for me the greater extent, one alkyd resin with nucleophilic groups HE,
(B) 1-50 wt.%, at least one polyamide resin containing amide groups of α-carboxy-β-oxocyclohexanecarboxylic acid,
(C) 5-90 wt.%, at least one organic solvent and/or water
(D) 0-10 wt.% and preferably 0.1 to 10 wt.% traditionally used additives or auxiliary substances,
(D) 0-70 wt.% and preferably 0.1 to 70 wt.% nanoscale particles, and
(E) 0-60 wt.% and preferably 0.1 to 60 wt.% traditionally used fillers and/or pigments, while the mass fraction in percent is given relative to the total weight of the composition of the coating.

3. The method of coating according to claim 1 or 2, in which the amide group of the α-carboxy-β-oxocyclohexanecarboxylic acid in the component (B) in the varnish composition laminated core is attached in the limit position.

4. The method of coating according to claim 1 or 2, in which nano-sized particles in a lacquer composition for laminated core are chemically active with respect to the components a) and/or (B).

5. The method of coating according to claim 1 or 2, wherein the varnish composition for laminated core contains Monomeric and/or polymeric organic compounds.

6. The method of coating according to claim 1 or 2, in which the curing is carried out at temperatures of providing MMT (peak metal temperature) in the range of the e 180-270°C.

7. A method of obtaining a core from electrical steel sheet using blending and assembling electrical steel sheet to obtain a laminated core technological methods selected from the group consisting of welding, a screed Assembly perekrasku, die-casting aluminum crimp parts and riveting, and sheet steel cover on the method of coating according to claims 1-6.

8. The method according to claim 7, in which the Assembly and the Assembly is carried out by welding.

9. The electrical steel sheet, coated by the method of coating according to claims 1-6.

10. Laminated core made of electrical steel, obtained from electrical steel sheets coated according to the method of coating according to claims 1-6.



 

Same patents:

FIELD: physics.

SUBSTANCE: disclosed is a method of making a permanent magnet with Dy and Tb diffused into the crystalline grain-boundary phase of a sintered magnet (S). Obtaining a sintered magnet with good magnetic properties over a short period of time is the technical result of this invention. In particular, the sintered magnet (S) based on an iron-boron-rare-earth element is placed in a working chamber (20) which is heated to a defined temperature while evaporating material (V) which is placed in the same or another working chamber and consists of a hydride containing at least one of Dy and Tb. The evaporated material adheres to the surface of the sintered magnet, and Dy and/or Tb atoms in the adhered evaporated material diffuse into the crystalline grain-boundary phase of the sintered magnet, wherein diffusion of metal atoms takes place before a thin film of at least one of Dy and Tb forms on the surface of the sintered magnet.

EFFECT: method does not have a preliminary step for cleaning the surface of the sintered magnet before attachment of Dy or Tb onto the surface of the sintered magnet, which improves efficiency.

6 cl, 6 dwg, 1 ex

FIELD: physics.

SUBSTANCE: disclosed is a permanent magnet which is made by forming a Dy and/or Tb film on the surface of a sintered magnet based on an iron-boron-rare-earth element, with given configuration, followed by diffusion of elements from the film into the crystalline grain-boundary phase of the permanent magnet. Deposition of evaporated Dy and/or Tb atoms onto the surface of the sintered magnet, for their subsequent diffusion inside, takes place due to the temperature difference between the inside of the chamber and the sintered magnet. Disclosed also is a method of making a permanent magnet, comprising a step for forming a film by evaporating evaporable metallic material containing at least Dy or Tb, a step for attaching the evaporated metal molecules to the surface of the sintered magnet based on the iron-boron-rare-earth element, and a step for diffusion with diffusion of the metal atoms attached to the surface during thermal treatment into the grain-boundary phase of the sintered magnet, wherein the evaporable metallic material contains at least either Nd or Pr.

EFFECT: permanent magnet obtained using said method has high coercitive force and improved magnetic properties.

14 cl, 12 dwg, 6 ex

FIELD: chemistry.

SUBSTANCE: method comprises the following steps: crushing recyclable iron-boron-rare-earth element based waste magnets to obtain a powder; obtaining a sintered bar using a powder metallurgy technique, and processing the sintered bar. Processing includes steps for heating the sintered bar which is put into a processing chamber; evaporating material with an evaporating metal containing at least one of elements Dy and Tb, wherein the material with evaporating metal is placed in the same or different processing chamber; bonding atoms of the metal evaporated at the evaporation step to the surface of the sintered magnet while controlling the amount of evaporated metal atoms fed, and diffusion of the bonded metal atoms into intercrystalline regions and/or the intercrystalline phase of the sintered bar.

EFFECT: possibility of recycling rare-earth elements contained in a mixture with waste magnets before their reprocessing, while reducing expenses and production equipment.

5 cl, 4 dwg, 1 ex

FIELD: physics.

SUBSTANCE: method involves heating an iron-boron-rare-earth element based sintered magnet to a given temperature in a working chamber, evaporating Dy and/or Tb fluoride lying in the same or different working chamber, allowing the evaporated material to attach to the surface of the sintered magnet through diffusion of atoms of the evaporated material into the grain-boundary phase of the sintered magnet.

EFFECT: high efficiency at low cost and improved magnetic properties of permanent magnets.

14 cl, 11 dwg, 4 ex

FIELD: electricity.

SUBSTANCE: cleaved surfaces of crystals of initial powder with more equal orientational mutual location of crystals in magnetic field are located as assembled together so that constant magnet manufacturing method is provided, which has extremely high orientation degree, which is the effect of invention. In the proposed method the initial powder (P) is loaded to cavity (22) and oriented in magnetic field by pressing or squeezing it with pressing device (5) in which pressing element (57) has the surface area which is less than section area of cavity. Subsequent change of position of pressing device throughout the section area of charging chamber provides mixing of initial powder with simultaneous orientation in direction of orientation in magnetic field. Thus, oriented semi-finished product is formed under pressure to the specified shape in magnetic field.

EFFECT: effect of invention is higher magnetic properties of constant magnet.

9 cl, 21 dwg, 2 ex

FIELD: physics.

SUBSTANCE: first step for adhering at least one of Dy and Tb to at least part of the surface of a sintered magnet based on iron-boron-rare-earth element is carried out; and a second step is carried out for diffusion of at least one of Dy and Tb adhered to the surface of the sintered magnet into a crystalline grain-boundary phase of the sintered magnet via thermal treatment at defined temperature. The sintered magnet used is a magnet made by mixing powder of a principal phase alloy, mainly consisting of the R2T14B phase, where R is at least one rare-earth element, mainly consisting of Nd, and where T is a transition metal, mainly consisting of Fe and powder of a liquid phase alloy, having higher content of R than the R2T14B phase, and mainly consisting of a phase rich in R, in given ratio of mixing, pressing the obtained mixed powder in a magnetic field and then sintering the pressed body in a vacuum or atmosphere of an inert gas.

EFFECT: high coercitive force and good magnetic properties with high efficiency.

10 cl, 6 dwg, 2 ex

FIELD: electricity.

SUBSTANCE: in compliance with the first aspect, the secondary side of non-contact energy transfer device includes the following: retaining element which is physically separated from primary side, magnetic layer, screening layer for screening of electromagnetic interferences, and heat insulation layer. Secondary coil represents a flat coil and is supported with retaining element, and at least magnetic layer is applied to one side of flat coil and is an integral unit with flat coil. In compliance with the second aspect, the secondary side of device includes many magnetic layers. Permeability of each of magnetic layers differs from each other, and each of magnetic layers forms lines of magnetic induction with primary side.

EFFECT: reducing the influence of heat and interference.

24 cl, 34 dwg

FIELD: electricity.

SUBSTANCE: fabrication line of strap magnetic circuit of transformer includes two extension-type knife-edge supports installed on assembly table, holding down device arranged with possibility of movement of packs in vertical direction, and clamping device for offset of packs relative to each other in horizontal direction, as well as holding down devices for horizontal movement of units. Mandrel for formation of closed circuit of units is demountable and is located above assembly table with possibility of vertical movement. Device for fixing units on the mandrel is made in the form of a clamp. Device for pressing the units to the mandrel is made in the form of platform with possibility of vertical movement, as well as groups of holding down rollers and two reeling rollers with possibility of horizontal movement.

EFFECT: enlarging functional capabilities.

4 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electric engineering, namely, to manufacturing of magnetic conductors from amorphous soft magnetic materials. Method includes winding of tape from amorphous soft magnetic material, its annealing, cooling and application of poly-para-xylylene layer onto cooled wound tape by gas phase deposition with thickness of 1-8 mcm. When conductor is installed into body, a silicon organic compound KLT-30 is applied pointwise onto its inner surface. Tape is annealed in magnetic field: longitudinal, with intensity of 5-30 E, or transverse, with intensity of 10-50 E. Magnetic conductors manufactured by proposed method preserve stable magnetic parameters under climatic and mechanical exposure in the range of temperatures of -60°C -+85 °C, which is the technical result of the invention. Absence of elastic tensions in conductors is confirmed by availability of 15% samples of each batch with high coefficient of squareness Ks=0.95-0.999; Ks of conductors with linear hysteresis loop makes 0.3-0.7; Ks of conductors with perminvar loop ≤0.01.

EFFECT: increased efficiency of method.

5 cl, 3 ex

FIELD: electricity.

SUBSTANCE: in strip magnetic conductor of distribution transformer manufacturing method the forming of pack block closed circuit is performed by indentation of the block by mandrel, the outer geometry of which is equal to inner geometry of finished strip magnetic conductor, inside the operating cavity of strip magnetic conductor coiling device. Pack block is tightly pressed against the mandrel along its surface. Block ends are fixed at the outer surface in the area of external pack block joint. The laying of the next block is performed by repeating the operation on the formed block till strip magnetic conductor of specified cross-section is obtained.

EFFECT: increase of response speed.

7 cl, 9 dwg

FIELD: electrical engineering; three-phase transformers.

SUBSTANCE: proposed flat magnetic system has three legs and two yokes. System stacks are assembled of identical groups of layers, three ones per group. External and internal outlines of all layers are rectangular. External outlines of all layers coincide. All laminations are rectangular. Each stack is assembled of similar sets of laminations of four type varieties. Laminations of all stack legs are identical. Yoke laminations are of three type varieties equal in length and different in width. Wide and intermediate, intermediate and narrow ones differ in width by same and small value. Top yoke lamination in first layer of group is narrow and that of bottom one, wide. Laminations of top and bottom yokes in second layer are identical and medium in width. Top-yoke lamination in third layer is wide and bottom-yoke one, narrow, Leg laminations of first layer are displaced upwards and those of third layer, downwards relative to those of second layer. All interleaving joints are horizontal. Group layers are assembled so that joint lines of laminations are disposed at different heights for each layer of group. In this way three-layer alternating interleaving of joints is attained to afford better distribution of magnetic field at corners of magnetic system compared with prior-art one.

EFFECT: reduced active and reactive saturation power loss at magnetic system corners, provision for automatic control of process.

1 cl, 1 dwg

FIELD: electrical engineering; transformer construction engineering.

SUBSTANCE: proposed laminated magnetic circuit of transformer has three legs and two yokes assembled of lamination stacks of similar groups of layers. Each layer has similar set of laminations, each incorporating one lamination of two extreme and intermediate legs, two laminations of upper yoke, and two laminations of lower yoke which are beveled at corners. Laminations of extreme legs 1 and yokes 2 are trapezium-shaped and beveled at extreme corners through 45 deg. Laminations of intermediate leg 3 are higher than those of legs 1, symmetrically shaped over two relatively perpendicular axes, with top angles 2α° and are relatively shifted in each group of layers along axis toward lower and upper yokes through pitch A. Laminations of yokes 2 have bevel toward extreme legs at angle of 45 deg. and toward intermediate leg, at angle of (90 - α) deg. Auxiliary gap in joints between laminations of one layer is overlapped by laminations of preceding and next layers.

EFFECT: facilitated pre-manufacture procedures and manufacture of transformer magnetic circuit.

1 cl, 4 dwg

FIELD: electrical engineering; oil-immersed power transformers.

SUBSTANCE: system stacks are built of similar groups of layers, three layers per group. Inner and outer contours of all layers are rectangular in shape. Inner and outer contours of all layers are aligned. Plates of legs are rectangular and trapezoidal and those of yokes are trapezoidal and beveled through 45 deg. All layers of each stack are assembled of similar sets of plates of five type varieties. Plates of first layer of extreme left and intermediate legs are trapezoidal and those of extreme right leg are rectangular. All plates of second layer are disposed as mirror images of axis drawn over outer vertical edge of extreme right leg plate. Central-leg plate of third layer is rectangular. Group layers are assembled so that junction areas of plates on straight lines are different for each layer of group. Such design ensures better distribution of magnetic field flux density at magnetic system corners compared with prior art.

EFFECT: reduced loss at magnetic system corners.

1 cl, 4 dwg

The invention relates to the field of electrical engineering and can be used in the manufacture of transformers, chokes and other devices with bronwyne magnetic wires

The invention relates to heat-resistant antifriction coatings and can be used as a primer, get on a flat metal substrate by the method of rolling, followed by molding, in particular - kitchen utensils

FIELD: chemistry.

SUBSTANCE: composition for fixing wrapping articles contains A) 1-60 wt % of at lest one resin of α,β-unsaturated polyether based on at least one unsaturated mono-, di- or tricarboxylic acid and/or substance containing molecules with mono-, di- or tricarboxylic acid groups, at least one polyol, B) 0.1-80 wt % of at least one inorganic and/or an organic-inorganic hybrid component, having functional groups for reaction with components A) and C), where said hybrid components are polymers or colloidal solutions based on silicon, titanium or zirconium and oxygen atoms, which contain hydroxyl and/or alkoxy groups and/or hydroxyalkyloxy groups and/or organic fragments, which have epoxy and/or isocyanate and/or unsaturated groups, C) 2-80 wt % of at least one monomer and/or oligomeric unsaturated component, which is styrene, vinyl toluene, hexanediol dimethacrylate, butanediol dimethacrylate and/or (meth)acrylates of products of a polyaddition reaction of ethylene oxide with trimethylolpropane capable of reaction with components A and B, and D) 0-15 wt % conventional additives, where wt % is calculated relative the total weight of the composition.

EFFECT: excellent heat conductivity properties and high level of electrical insulation along with excellent adhesion and thermal stability.

6 cl, 1 tbl, 2 ex

Liquid hardening // 2447114

FIELD: chemistry.

SUBSTANCE: invention relates to curing agents for air-drying alkyd-based resins, coating compositions, such as paint, varnish, wood stain, inks and linoleum floor coverings. Described is a curable liquid medium containing a) from 1 to 90 wt % of an alkyd-based resin and b) from 0.0001 to 0.1 wt % of a siccative in form of an iron or manganese complex with a tetradentate, pentadentate or hexadentate nitrogen donor ligand.

EFFECT: said siccative has high activity and enables hardening of compositions at relatively low concentration in a curable liquid medium.

19 cl, 8 tbl, 5 ex

FIELD: metallurgy.

SUBSTANCE: binding consists of cross-linking agent and branched poly-ether with partially remote functional groups with acidic functional groups. Said branched poly-ether consists of at least one multi-functional component, of at least one di-functional component reaction capable relative to a functional group of multi-functional component and at least one mono-functional component containing fat acid. Temperature of poly-ether vitrification is 40°C or more.

EFFECT: production of binding applicable for compositions of powder coating where binding improves corrosion resistance.

12 cl, 3 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: composition contains the following in wt %: 16-23 film-forming agent; 38-40 mixed pigments; 2.0-3.0 organic complexing agent - tanning and derivatives thereof; 1.0-2.0 inorganic filler - talc; 3.0-4.0 mixture of C2-C4 alcohols and an organic solvent - the rest. The film-forming agent is 12-15 wt % alkyd varnish and additional 4-8 wt % synthetic chlorinated rubber. The mixed pigments are in form of a mixture of zinc oxide, zinc powder and micaceous iron. The mixture of alcohols contains ethyl alcohol, butyl alcohol and isobutyl alcohol in ratio 1.0:1.0:1.4. The invention enables to obtain compositions with service life of coatings of at least 10-15 years.

EFFECT: coatings have good impact properties and high rate of drying, priming composition does not require surface mechanical pre-treatment in order to remove scales and rust.

6 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: composition contains the following, wt %: alkyde primer 90-98, organosilicon amide of perfluorocarboxylic acid of formula C3F7OCF(CF3)CF2OCF(CF3)CONH(CH2)3Si(OC2H5)3 1-5 and 1-5 product of reaction of boric acid, diethanolamine and fatty acid of plant oil. The fatty acid of plant oil is selected from oleic acid, linoleic acid and linolenic acid, in molar ratio of 1:4:2, respectively.

EFFECT: invention enables to obtain anticorrosion coatings with good physical-mechanical and water-, oil- and gasoline-resistant properties.

3 tbl, 5 ex

Composite oil paint // 2415897

FIELD: chemistry.

SUBSTANCE: invention is used in shipbuilding, construction works in shafts, for repair works on metallurgical factories, for painting concrete and plastered structures, for painting metal structures, wooden structures and slate roofing. The paint contains components in the following ratio in wt %: film-forming agent 50-90, titanium dioxide and/or chalk 0.1-32.0, cement and/or cement dust 0.1-30.0, siccative 0.5-5.0, microtalc and/or micromica or sand and/or lime or lime milk and/or flue ash and/or microcalcium and/or sulphanol and/or iron oxide - the rest. The film-forming agent contains components in the following ratio in wt %: pentaphthalate and/or glyphtal lacquer or mixture thereof with nitrocellulose and/or perchlorovinyl and/or ethylcellulose and/or coal-tar varnish 1-55.0, drying oil or masut or bitumen 1-45.0, bustilat and/or liquid glass 1-10.0, water and/or nefras and/or solvent and/or benzine and/or solvents 647, 646, 650, 651 3-20.0, sulphanol or butyldiglycol - the rest.

EFFECT: paint film has good adhesion to surfaces, coating does not crack during bending and sharp change in temperature, paint film has high resistance to water, acid, alkali, benzene, the paint can be applied on a rusty, oily or wet surface, does not form a dried up film during storage and is environmentally safe.

3 cl, 4 tbl, 70 ex

Up!