Electroinsulation material

FIELD: insulation materials.

SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).

EFFECT: improved performance characteristics.

2 tbl, 13 ex

 

The invention relates to electrical engineering, namely, insulating materials intended for the insulation of the windings of electrical machines.

Known insulating materials containing mica paper, a flexible reinforcing substrate and a binder based on thermosetting resins (ed. St. USSR №240082, CL N 01 In 3/02, N 01 3/40, H 02 To 15/04, 1964; ed. Saint of the Russian Federation No. 2010367 C1, CL N 01 3/40,1992; the Federal Republic of Germany patent No. 1765565, CL 21, 2/02, 1972; GDR patent No. 55632, CL 21, 2/02, 1967; GDR patent No. 77524, CL 21, 2/02, 1970; U.S. patent No. 3998983, CL 427-374, 1977).

As mica paper these pieces of paper used on the basis of mica Muscovite or phlogopite, as a substrate of glass or polymer film, as a binder - adhesive compositions based on polyester, epoxy, silicone resins and other.

The drawback of such materials is low viability, resulting in the manufacturing process, transportation and storage, they become hard, brittle and unsuitable for insulation of the windings. Low viability of known materials is not possible to store them for more than three months and restricts their scope, but also requires additional costs for cooling of the material during transportation and storage (ed. St. USSR №794673, CL N 01 3/04, H 02 To 3/30, H 02 To 15/12,1978).

Also known Elektrisola the ionic materials containing a layer of mica paper substrate of glass and a binder based on epoxy resins (ed. St. USSR №1474747 A1, class H 01 In 3/4, 1987; ed. St. USSR №1720096 A1, class H 01 3/40, 1989).

The disadvantages of such materials include low flexibility and the need to heat them to a temperature of 60°and more after application of the elements of the windings. These materials cannot be used for manual solonoski, and in the case of machine solonoski winding machine must be equipped with heating devices. In addition, the need for heating in the process of solonoski leads to increased toxicity due to increased allocation of flying.

Proved to be widely known insulating material consisting of mica paper, covered on two sides by glass or polyethylene terephthalate film and fiberglass and impregnated epoxyacrylate binder of the following composition, parts:

epoxy resin100
Andik-anhydride37
oligopyrroles TGM-3
(dimethacrylates ether of triethylene glycol)137

(THE 16-91 ITU "Tape Kudinova impregnated grades LSC-110-MP (SPL, ST, TT), LSAC-5-MP (CPF), ISC-SS", date of introduction of 01.01.2003 of technological regulations 05758799.02206.00198 "Tape Kudinova impregnated grades LSC-110-MP (CPF, ST, CT)", approved 30.05.2002, is similar.

This binding belongs to the group of unsaturated polyesters, as in the interaction of epoxy resin and unsaturated Andik-anhydride formed unsaturated polyester. Active double bond Andik-anhydride curing process copolymerized with methacrylate groups oligoadenylate. In this binder oligopyrroles TGM-3 is polimerizacionnye diluent. During curing of the binder forms a cross-linked unsaturated polyester.

The use of this binder allows you to get soaked Kudinova tape with high flexibility. However, the heat resistance of such materials does not exceed 130°and their dielectric characteristics at the operating temperature is not high.

The above disadvantages are mainly determined by the properties of the binder. The composition of the present invention is the closest binder based unsaturated nitrogen-containing polyester, polyarizatsionnogo diluent and peroxide initiator, in which to improve adhesion introduced epoxy resin (ed. St. USSR №294839, class C 08 g 17/14, 1971 - prototype). However, it is not suitable for obtaining steklolaminirovanykh tapes, because of its chemical nature does not provide the necessary flexibility, as the material is "hard" t the PA.

The aim of the invention is the creation of an electrically insulating material having high heat resistance, electrical and mechanical strength, environmental safety and preserving flexibility for long term storage.

To achieve this, according to the invention serves insulating material containing a layer of mica paper, one or two substrate of glass or fiberglass and polyester or polyimide film and a binder based on an unsaturated polyester, polyarizatsionnogo diluent, peroxide initiator, including unsaturated nitrogen-containing polyester obtained by polycondensation of maleic anhydride and polyhydric alcohols with N - (β-oxyethyl)-1,2-aminophthalic, N-(β-oxyethyl)-1,2-aminosalicylates, N-(β-oxyethyl)-1,2-aminoantipyrene hydroptilidae acids or mixtures thereof; poliarizatsionnoy thinner - oligopyrroles; target additive and possibly low molecular weight epoxy resin as the second binder in the following ratio of components, parts:

unsaturated nitrogen-containing polyester39,6-of 40.9
poliarizatsionnoy thinner - oligopyrroles36,0-48,7
additives target2,4-14,0
including a second bindera 2.0 to 12.1
peroxide initiator0,8-1,0

As the polyhydric alcohols used diethylene glycol (binder No. 1) or Tris-((β-oxyethyl)-isocyanurate (binder No. 2). For the implementation of this invention are also suitable: triethylene glycol; 1,2-propylene glycol; 2,2'-DIMETHYLPROPANE (neopentylglycol); 1,1,1-trimethylolpropane (atrial) and 1,1,1-trimethylated (Merial). This difunctional alcohols can be used to equimole replacement of diethylene glycol in binder No. 1, and trifunctionally - in binder No. 2.

As polyarizatsionnogo diluent - oligoadenylate is mainly used TGM-3 (dimethacrylates ether of triethyleneglycol), can also be used oligoadenylate IFG-1 (α,ω-methacrylate-(bis-ethylene glycol)phthalate), IFG-9 (α,ω-methacrylate-(bis-triethylene glycol)phthalate) and MEG (monomethacrylate ether of ethylene glycol) or mixtures thereof.

To improve thermal stability of the compound and, accordingly, the heat insulating material part polyarizatsionnogo diluent - oligoadenylate - can be replaced by allyl esters of polycarboxylic acids, which can be used diallylphthalate or isoft is at and treelistener or isocyanurate.

Target additives may include peroxide initiators, accelerators and inhibitors of radical polymerization, latent catalysts, adhesion promoters and other commonly used additives and low-molecular-weight epoxy resin.

A binder according to the invention provides insulating material flexibility and environmental safety, retains its technological properties for at least 6 months and provides high dielectric and mechanical properties of insulation at operating temperatures 155-180°allowing you to use it in the form of tapes or sheets for continuous or tubular insulation of the windings of electrical machines.

As mica paper in insulating material used paper-based mica Muscovite or phlogopite weighing from 50 to 160 g/m2as the substrate used fiberglass weighing from 25 to 80 g/m2and the polyethylene terephthalate film of a thickness of from 0.008 to 0.02 mm or polyimide with a thickness of 0.03 to 0.04 mm Instead of the polyethylene terephthalate can be used other polyester film, for example polietilentereftalata or polycarbonate.

Insulating material is made by impregnating machine horizontal type with two drying chambers in two stages. Ready the insulating material is fed to the transport mechanism and delivered in a roll. If necessary, the roll can be cut into the rollers.

The examples of the preparation of the binder.

Binder No. 1.

The reactor is placed (vesc) 15,7 someinteresting anhydride. Include a stirrer and a weak current of inert gas portions slowly (to avoid ejection of the reaction mass) for 1-2 h load 6.0 monoethanolamine so that the temperature in the mass did not rise above (120±2)°by ekzotermicheskie reaction of the anhydride and monoethanolamine. Thus obtained N-(β-oxyethyl)-1,2-aminosalicylate acid is heated for 1.0-1.5 h to (180±5)°C and maintained at this temperature for 2-3 h until an acid number of ≤5 mg KOH/g, the Heating off, the reaction mass is cooled to (75±5)°and load 12,0 maleic anhydride, 9.1 diethylene glycol, hydroquinone 0.05, 0.05 turama D and 0.08 Tetra-butoxysilane. Then include the heating and the temperature raised to 180-185°C. the Polycondensation is carried out at a given temperature to reach an acid number of 35 to 40 mg KOH/g thus Obtained nitrogen-containing unsaturated polyester in the amount of 40.9 cooled down to 120-130°and poured into the mixer under a layer of previously inhibited 0.05 benzoquinone 36.0 oligoadenylate TGM-3. The solution is cooled to 20-30°and load 0,82 lead-manganese drier LCD 12, peremeci is up for 0.5-1 h until smooth, then enter 2% of a 50%aqueous solution of peroxide of Dicumyl in dibutyl phthalate and again stirred for 0.5-1.0 hours

Binder No. 2.

The reactor is placed (parts) of 16.2 someinteresting anhydride. Include the stirrer, which runs until the end of the process. In a weak current of inert gas portions (to avoid ejection of the reaction mixture from the reactor) at first slowly and then faster load 6.2 monoethanolamine so that the temperature in the mass did not rise above (120±2)°by ekzotermicheskie reaction of the anhydride and monoethanolamine, and then include the heating of the reactor and increase the temperature to (180±5)°for 1.0-1.5 hours Heating off when the condensate becomes Athanasia from the reaction mixture and the acid number of the product cyclodehydration initially formed N-(β-oxyethyl)-1,2-aminosalicylate acid is not more than 5 mg KOH/g

The reaction mass is cooled to (75±5)°and add in it a 9.5 maleic anhydride, hydroquinone 0.05, 0.05 tetramethoxysilane and 0.05 turama D. the Temperature was raised to 110-120°C and maintained to 1.0-1.1 hours After that load of 9.6 Tris-(β-oxyethyl) isocyanurate, raise the temperature to 180-185°for 1.0-1.5 hours

Carry out the polycondensation at this temperature until the acid number (40±3) mg KOH/g Obtained unsaturated nitrogen-containing on Ieper in the number 39,6 cooled down to 140-145° With and merge into the mixer while the mixer, where is 48.7 oligoadenylate TGM-3, previously inhibited 0.3 benzoquinone. The solution is stirred for 0.5 hours Then at 40-50°download 12,1 epoxy resin ED-22, 0.35 tetramethoxysilane and 0.5 desiccant LCD 12 and stirred for 0.5 hours Then add 2% of a 50%aqueous solution of peroxide of Dicumyl in dibutyl phthalate and again stirred for 0.5-1.0 hours

Examples of the production of dielectric material.

Example 1.

1 stage. Fiberglass weighing 27 g/m2soaked in a bath containing a solution in toluene of natural rubber at a concentration of 2.7%, impregnated fiberglass continuously laid mica paper based on the Muscovite surface density of 50 g/m2,and received selolwane canvas comes in the first drying chamber with a temperature of 100-130°C. From the drying chamber selolwane canvas arrives at the receiving mechanism and delivered in a roll.

stage 2. Roll selolwane canvas with the release mechanism goes into a treatment site containing binder for impregnation based on unsaturated nitrogen-containing polyester, polyarizatsionnogo diluent and special additives: free radical initiator, inhibitor and accelerator (binder No. 1).

Soaked the second selolwane canvas comes in the first drying chamber with a temperature of 30-60° With and at the outlet of the drying chamber is combined with the polyethylene terephthalate film of a thickness of 0.01 mm coated on the inner surface with a layer of epoxy-polyester paint EP-S.

Before combining the film was Lateralus and dry a little in the second drying chamber at a temperature of 30-40°C.

Ready insulating material arrives at the receiving mechanism and delivered in a roll.

The content of the binder in the finished insulating material 25 to 35 wt.%, electric strength not less than 50 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 2.

1 stage. Fiberglass weighing 38 g/m2soaked in a bath containing a solution in toluene of natural rubber at a concentration of 2.7%, impregnated fiberglass continuously laid mica paper based Muscovite weighing 60 g/m2,and received selolwane canvas comes in the first drying chamber with a temperature of 100-130°C.

From the drying chamber selolwane canvas arrives at the receiving mechanism and delivered in a roll.

stage 2. The technological process is similar to stage 2 of example 1.

The content of the binder in the finished insulating material 25 to 35 wt.%, electric strength not less than 45 is In/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 3.

1 stage. Fiberglass weighing 45 g/m2soaked in a bath containing a solution in toluene of natural rubber at a concentration of 2.7%, impregnated fiberglass continuously laid mica paper based on the Muscovite surface density of 70 g/m2,and received selolwane canvas comes in the first drying chamber with a temperature of 100-130°C.

From the drying chamber selolwane canvas arrives at the receiving mechanism and delivered in a roll.

stage 2. The technological process is similar to stage 2 of example 1.

The content of the binder in the finished insulating material 25 to 35 wt.%, electric strength not less than 40 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 4.

1 stage. The technological process is similar to stage 1 of example 1.

stage 2. Roll selolwane canvas with the release mechanism goes into a treatment site containing binder for impregnation based on unsaturated nitrogen-containing polyester, polyarizatsionnogo diluent and special additives: free radical initiator, inhibitor, accelerator, latent catalysis the ora - tetramethoxysilane and epoxy resin ED-22 (binder No. 2).

Impregnated selolwane canvas comes in the first drying chamber with a temperature of 30-60°and at the outlet of the drying chamber is combined with a polyimide film with a thickness of 0.03 mm coated on the inner surface with a layer of epoxy-polyester paint EP-S.

Before combining the film was Lateralus and dry a little in the second drying chamber at a temperature of 30-40°C.

Ready insulating material arrives at the receiving mechanism and delivered in a roll.

The content of the binder in the finished insulating material 25 to 35 wt.%, electric strength not less than 50 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 180°C.

Example 5.

1 stage. The technological process is similar to stage 1 of example 2.

stage 2. The technological process is similar to step 2 of example 4.

The content of the binder in the finished insulating material 25 to 35 wt.%, electric strength not less than 45 kV/mm, the tangent of dielectric loss angle not greater than 0.25 at a temperature of 180°C.

Example 6.

1 stage. Fiberglass weighing 38 g/m2and 45 g/m2soaked respectively in the lower and upper bath impregnating host machine containing solution in toluene n is moralnego rubber with a concentration of 2.7%. Impregnated fiberglass from the bottom of the bath combined with mica paper based on the Muscovite surface density of 70 g/m2impregnated fiberglass from the top of the bath placed on a mica paper on top, and obtained selolwane canvas comes in the first drying chamber with a temperature of 100-130°C.

From the drying chamber selolwane canvas arrives at the receiving mechanism and delivered in a roll.

stage 2. Roll selolwane canvas with the release mechanism goes into a treatment site containing a binder No. 2.

Impregnated selolwane canvas comes in the first drying chamber with a temperature of 30-60°C.

Ready insulating material arrives at the receiving mechanism and delivered in a roll.

The content of the binder in the finished insulating material 30 to 40 wt.%, electric strength not less than 25 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 7.

1 stage. The technological process is similar to stage 1 of example 6. The two substrates are used fiberglass weighing 45 g/m2and mica paper based on the Muscovite surface density of 70 g/m2.

stage 2. The technological process is similar to stage 2 of example 6. The content of the tie is found in the finished insulating material 30 to 40 wt.%, electric strength not less than 20 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 8.

1 stage. The technological process is similar to stage 1 of example 6. The two substrates are used fiberglass weighing 45 g/m2and mica paper based Muscovite weighing 90 g/m

stage 2. The technological process is similar to stage 2 of example 6. The content of the binder in the finished insulating material 30 to 40 wt.%, electric strength not less than 18 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 155°C.

Example 9.

1 stage. The technological process is similar to stage 1 of example 6. The two substrates are used fiberglass weighing 45 g/m2and mica paper based Muscovite weighing 120 g/m2.

stage 2. The technological process is similar to stage 2 of example 6. The content of the binder in the finished insulating material 35 to 45 wt.%, electric strength not less than 30 kV/mm, the tangent of dielectric loss angle zapressovanny isolation is not greater than 0.25 at a temperature of 155°C.

Example 10.

1 stage. The technological process is similar to stage 1 of example 6.

2 with the pushing. Roll selolwane canvas with the release mechanism goes into a treatment site containing a binder No. 2.

Impregnated selolwane canvas comes in the first drying chamber with a temperature of 30-60°C.

Ready insulating material arrives at the receiving mechanism and delivered in a roll.

The content of the binder in the finished insulating material 30 to 40 wt.%, electric strength not less than 25 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 180°C.

Example 11.

1 stage. The technological process is similar to stage 1 of example 7.

stage 2. The technological process is similar to stage 2 of example 10. The content of the binder in the finished insulating material 30 to 40 wt.%, electric strength not less than 20 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 180°C.

Example 12.

1 stage. The technological process is similar to stage 1 of example 8.

stage 2. The technological process is similar to stage 2 of example 10. The content of the binder in the finished insulating material 30 to 40 wt.%, electric strength not less than 18 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 180°C.

Example 13.

1 stage. Technologists who institutions the process is similar to stage 1 of example 9.

stage 2. The technological process is similar to stage 2 of example 10. The content of the binder in the finished insulating material 35 to 45 wt.%, electric strength not less than 30 kV/mm, the tangent of dielectric loss angle pressed isolation is not greater than 0.25 at a temperature of 180°C.

Characteristics of insulating materials according to examples 1-13 are shown in table 1 and 2.

Table 1
DescriptionWe offer insulating material (EIM) examples:Known aim (similar)
12345
Nominal thickness, mm0,080,100,130,100,130,13
The average dielectric strength, kV/mm, not less than504540504530
Specific breaking load tensile N/mm, not less than7012015080100120
The binder phase content, wt.%25-3525-3525-3525-35/td> 25-3525-35
Warranty period of storage at a temperature of 15-35°S, mo.666663
The-classified °155 (F)155 (F)155 (F)180 (H)180 (H)130 (In)
The tangent of dielectric loss with temperature:
155°0,250,250,25---
180°---0,250,25-

Table 2
DescriptionWe offer insulating material (EIM) examples:Known aim
678910111213(similar)
Nominal thickness, mm0,130,150,170,200,13 0,150,170,200,15
The average dielectric strength, kV/mm, not less than252018302520183018
Specific breaking load tensile N/mm, not less than240240240240240240240240240
The binder phase content, wt.%30-4030-4030-4035-4530-4030-4030-4035-4530-40
Warranty period of storage at a temperature of 15-35°S, mo.666666663
The-classified °155 (F)155 (F)155 (F)155 (F)180 (H)180 (H)180 (H)180 (H)130 (In)
The tangent of dielectric loss with temperature:
155°0,250,250,250,25-----
180°----0,250,250,250,25-

Insulating material containing a layer of mica paper, one or two substrate of glass or fiberglass and polyester or polyimide film and a binder based on an unsaturated polyester, polyarizatsionnogo diluent and peroxide initiator, characterized in that the binder contains unsaturated nitrogen-containing polyester obtained by polycondensation of maleic anhydride and polyhydric alcohols with N-(β-oxyethyl)-1,2-aminophthalic, N-(β-oxyethyl)-1,2-aminosalicylates, N-(β-oxyethyl)-1,2-aminoaspartatetransferae acids or mixtures thereof, poliarizatsionnoy thinner - oligopyrroles, targeted supplements, and possibly low molecular weight epoxy resin as the second binder, the following ratio of components, parts:

Unsaturated nitrogen-containing polyester 39,6-of 40.9
Active diluent - oligopyrroles36,0-48,7
Additives target2,4-14,0
including
The second bindera 2.0 to 12.1
Peroxide initiator0,8-1,0



 

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