DE1769695B2 - USE OF SALTY MIXED POLYMERISATES TO FORM ELECTRICALLY SEPARATING COATINGS - Google Patents

Description

3 4

If necessary, plasticizers such as poly- Example 3

vinyl acetate, propionate, polyacrylic butylate, and also pig- "_", _. . . , _., .., .. "

elements such as mica, lithopone and graphite as well as 25 ·, copolymer acrylic ester / methacrylic acid,

Dyes, can also be used. 30 / o Dimethylethanolainm,

The following are exemplary embodiments of the inven- S * Vo homopolymer of vinyl propionate,

Proper use of agents for the ^ 5 VoUthopone,

stratification of electrical steel sheets with electrically separating ^{42 / o water-} permeable coatings.

All percentages relate to pigmented paint by weight with a viscosity of 1 mm

percent. 10 (Ford cup, 6 mm) medium-hard, plastic from 75 ° C,

high adhesive strength

example 1 Example 4

25% copolymer Acrylester / acrylic acid, 30 o / ₀ Vinylester copolymer / Croton / maleic

3Vo monoethanolamine, 15 acid,

24 Vo Lithopone, 4 o / _o Diethanol lamb,

2 Vo urea-formaldehyde resin, water-soluble, 20 Vo mica 5 mm,

1 Vo ammond dichromate, 46 Vo water.

45 Vo water.

20 Pigmented lacquer with a viscosity of 2 min

Pigmented lacquer with a viscosity of 1 min (Ford cup, 6 mm), medium-hard, plastic from 75 ° C. 30 see (Ford cup, 6 mm) hard, elastic, low
Plasticity from 180 ° C. B e 1 s ρ 1 e 1 5

15 Vo copolymer acrylic ester / acrylic acid, bis ρ ie 1 2 ² 5 10 Vo shellac, wax-free,

6% dimethylethanolamine,

40% acrylic ester / acrylic acid copolymer, 23% lithopone,

5 Vo melamine resin, water-soluble. 1 o / _o graphite powder,

5 Vo dimethylethanolamine, 45% water.

50 Vo water. 30th

Pigmented varnish with a viscosity of 1 min

Clear lacquer with a viscosity of 1 min (Ford cup, 30 see (Ford cup, 6 mm) hard, smooth surface, 6 mm) hard, elastic, low plasticity from 200 ° C. practically non-plastic.

Claims (3)

1 2 towards the end of sheet metal production on the still warm patent claims: sheet metal is applied. The insulating agent dries through the inherent sheet metal 1. Use of aqueous solutions to heat while cooling the sheet metal, which means no known alkanolamine salts of copoly- 5 require additional energy for the drying process merisates of acrylic, methacrylic, croton or will. However, maleic acid is required to carry out this procedure with acrylic or vinyl esters for burens complex devices are necessary, and it Application of electrically separating coatings on electrical remains the difficulty of uniform layer thicknesses sheet metal. to reach. 2. Use of solutions according to an io The object of the invention is to provide a means for Claim 1 with an additional content of 1 to coating of electrical steel is available 5% of a reactive resin or 5 to 15%, which represents the good properties of the Shellac for the purposes of claim 1. German Patent 1246 071 described Mit- 3. Use of solutions according to Antel, especially the high adhesion to metals 1 or 2, which also has a soft 15 lish surface, but is evenly distributed macher included, for the purpose of bringing in at cost savings Proverb 1. This task is accomplished by using water igen solutions of known alkanolamine salts of copolymers of acrylic, methacrylic, croton-20 or maleic acid with acrylic or vinyl esters / ut formation of electrically separating coatings on electrical sheet metal solved. In principle, any of the acids mentioned can be polymerized with any of the esters mentioned. Polymerizations 25 with an acid number of 85 to 110 and a toughness at 20 ° C of 1 · 10 * to 1.5 · 10 ⁴ cP, which suffice The invention relates to the use of saline-reactive groups in the heat, like copolymers to form electrically, for example above 150 ° C to crosslink. as separating coatings on electrical sheets. The elec- Alkanolamines are in particular ethanolamines trically separating coatings are used on electrical steel sheets. The alkanolamines are stoichiometric State of the art is used in German metric quantities. Patent specification 1 246 071 by the same applicant It is known per se that by copolymer described walking. Said patent even sation of acrylic acid with acrylic acid ester and of relates to the use of aqueous dispersions of vinyl esters with crotonic or maleic acid macrethermoplastic Plastics or thermoplastic 35 molecular substances arise as a result of the content Natural products, such as preferably polyacrylic acid esters, on carboxyl groups for salt formation - z. B. with the Polyvinyl ester. Polyvinyl ether or natural latex, amines, such as the ethanolamines - are capable and together with a small amount, preferably of water-soluble. 1 to 5 percent by weight, of a phosphoric acid or solutions of this water-soluble, film-forming an acidic phosphate, optionally in polymeric substances with solids contents between 50 and 40 mm, for the formation of electrically separating coatings. 60 ⁰ O are applied by rolling, for example with the aid of the rubber rollers known in German Auslegeschrift 1058179, evenly thinly on coating media based on aqueous poly electrical steel sheets, which describes excellent acrylate dispersions that are achieved for coating electrically separating coatings,
hen wires, sheet metal, walls, fabrics, etc. _{45 It is} easy to obtain coatings, to find use. These dispersions contain a material which becomes plastic below 100 ° C. in order to achieve a mixed polymer of acrylonitrile, an α-olefin _{with a} certain self-adhesion of the coated niche monocarboxylic acid and an ester of a material. However, even with -olefinic monocarboxylic acid with an aliphatic, significantly higher temperatures, primarily monovalent C ₁ . ₈ alkanol. Optionally kön- ₅₀ at 200 ° C, plastic coatings with high hardness and NEN them Epihydrinalkoholderivate or aldehyde _smoothness i _e i _{t ore who} the. A plasticity is only added when high condensation resins are added. Temperatures are particularly In the application of such dispersions, is dung from urea-melamine, formaldehyde Melauf the spraying process instructed achieved a method amine resins and wax-free shellac, or which susceptible to interference and in which rather un- 55, it may also contain small quantities of thermoplastic gjeiche Layer thicknesses result. Thus beispiels- _sc hen plastics or thermoplastic nature was carried out at a coating thickness of 10 μτη the products are added as difference as a basis ± 3 μΐη, corresponding to 30% absolute. Since it prepares fo _r the aqueous dispersions of the German Ausallgemein difficulties dispersions are used to attach font 1,240,071. While solids contents of more than 25 to 30% have to be handled by injection molding, the additives of condensation products of the urine are technically to be handled, in the case of such types of coating material formaldehyde or melamine the plasticity processing methods reduce high water contents in the coating without increasing the film hardness too much , resources are indispensable. This water must always cause additions of shellac to a strong increase, but in the following Tre-V-n process the film hardness and smoothness are evaporated with extremely low plastids, so that the process is very cost-effective. Ultimately, the small amounts encourage the burden to be borne. Substances according to the German Auslegeschrift 1 246 071 In the German Auslegeschrift 1176 219, the plasticity is strong and at the same time increase the Process described in which the insulation means flexural strength and elasticity of the insulation film.