Electric insulating material

FIELD: electrical engineering; insulating materials for wires or commutators of electrical machines.

SUBSTANCE: proposed mica base insulating material has mica paper layer, backing of inorganic fiber (glass or basalt), and binders, such as betulinic and adipic acids having molecular mass of 10 000 to 15 000. Such binders of desired molecular mass can be easily produced.

EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.

1 cl, 2 tbl, 11 ex

 

The invention relates to the field of electrical engineering, namely for insulating materials based on Kudinova securities and reinforcing substrates of inorganic fibers (glass or basalt), for the insulation of wires or collectors in electrical machines.

The prior art layered insulating materials consisting of slyudinitovyh paper, fiberglass, or fabric of basalt fibers, minorityserving in the material of the binder compositions containing including polyester resin (A.S. USSR No. 67092 MKI2N 01 3/04, 1979, U.S. Pat. Of the Russian Federation No. 2084031 IPC6N 01 3/04, 1997, U.S. Pat. Of the Russian Federation No. 2120145 IPC: N 01 3/04, 1998). Also known insulating material, consisting of slyudinitovyh paper, glued on two sides with fiberglass binder brand EP-9125 (TU 16-503. 192-79. Tape steklomagnezitovy impregnated binder grade LSAP-TG. The process of manufacturing steklomagnezitovy tape marks And 79. 011. 168. 00029-79). Lac EP-9125 is a solution in organic solvents epoxy resin and acid polyesters AD-1 (a polycondensation product of adipic acid and ethylene glycol). This material has a heat resistance of not higher than 130°and low dielectric characteristics operating temperature.

Closest to the present invention is a material containing the s-impregnated bonding layer slyudinitovyh paper and combined with it the substrate layer of inorganic fibers, where in use as a binder composition consisting of Dianov resin, polyester resin brand TF-82, which is a polycondensation product of dimethyl ester of terephthalic acid and a mixture of glycols consisting of 80 mol.% of ethylene glycol and 20 mol.% of diethylene glycol, melting point resin TF-82:80-100 C and mol. m 15000-25000, and, as an additive, butoxyethanol crazyforbargains resin. As indicated in the description, the components of the binder in the known method (prototype) do not react with each other until a temperature of 160°and thus the composition is a thermoplastic binder to a temperature of 160°C. Therefore, when drying in an impregnating machine is unacceptable raising the temperature above 160°and excluded From the subsequent stage heat treatment, providing in some cases improving the heat resistance and mechanical strength of the material. Also the disadvantages of this insulating material can be attributed to the technological complexity of making multicomponent binder, low elasticity, relatively low rates of electrodiagnostic, mechanical strength and heat resistance.

The technical result of the proposed technical solution is to eliminate these disadvantages, namely the increase in electrical, mechanical strengths insulating what about the material while enhancing the heat resistance and elasticity while simplifying the technology of the material obtained.

This object is achieved in that the known insulating material containing layer slyudinitovyh paper, a substrate made of inorganic fibers, binder, which includes a polyester resin as a binder contains a polyester-based betulin and adipic acid (mol. m 10000-15000 in the following ratio, wt.%

Kudinova paper 20-60

binder 3-7

the substrate of inorganic fibers else

Only declare the ingredients of the composition and the ratio of the material components ensure the achievement of the objectives specified above.

Stekloobraznye materials - adhesive compounds consisting of heterogeneous components. The adhesive forces in these materials is associated sljudinitovye paper emeraldia its substrate, as well as determine their improved deformation properties, the thickness of the polymer adhesive contributes to the value of electrodiagnostic. Increase the adhesion strength between the layers of material in the proposed method, provided that the polyester-based betulin and adipic acid (mol. m 10000-15000 able in the temperature range 200-240V°to post-polycondensation, the diffusion of the fragments of the binder in the surface layer slyudinitovyh paper and self-organization of supramolecular structures. Accordingly, mechanical p is echnosti, thermal stability and, due to the significant decrease in the content of the organic polymer component in the material and thickness of the polymeric adhesive, the strength of the material, and plastic properties of the used polyester cause higher elasticities. Polyester-based betulin and adipic acid (hereinafter referred to as polyester-BA) mol. m 40000-50000 described (Wainimala and other "Polyester-based betulin and adipic acid" in Physical chemistry of polymers: proceedings of the. Tver, Tomsk state University, 1996, p.124-127). However, the proposed technical solution, it is particularly important that they say. m not exceeding 15000, and its structure is rigid-chain polymer with a short hydrocarbon fragments in the chain separating the fragments stiffness

At these rates, this polymer has heat resistance, ability in a certain temperature range to the post-polycondensation reactions with increasing mol. m to 30000-35000 and simultaneous formation of a highly organized structure. Thus in technology offer insulating material is provided by a heat treatment at a temperature of 200-240°C for 2-3 h, which is the final formation of the structure of a material with a strong interaction of all components as a whole, which in turn provide the provides high heat resistance and mechanical strength, the low content of the organic component is a binder - increased values electrodiagnostic. Binder impregnation is used in the form of a solution of polyester BA in toluene with a concentration of 30 wt.%, the simplicity of the composition of the binder provides a simplification of insulating material.

In the proposed material used Kudinova paper, obtained by any known method, for example, made of Muscovite or phlogopite (natural mineral mica) with a surface density of 50 to 250 g/cm2, glass or fabric of basalt fibers insulating thickness of 0.03-0.05 mm weighing from 24 to 140 g/m2. The proposed composition of the material provides elasticity (due to the diffusion in the surface layers of ludomania thermoplastic organic polymer binder), extra strength and mechanical strength, thermal stability (melting point formed during post-polycondensation polymer 250° (C)that eliminates the delamination slyudinitovyh paper from the substrate even at temperatures above 200°C.

The invention is illustrated by examples and data of tables 1 and 2.

Example 1. On unwinding node impregnating machine set roll slyudinitovyh paper and a roll of fiberglass. On fiberglass, digamists speed 2-10 m/min, the dipping method is continuously applied to the binder solution (30 wt.% the solution of polyester BA in toluene), soaked fiberglass continuously stack sljudinitovye paper, which is impregnated with a solution of a binder. Thus obtained stekloduvnoe cloth is fed into the drying chamber at a temperature of 95-105°With the evaporation of the solvent, then the blade is served on hot calendering temperature 200°With time passing in calenders 8 min and a pressure of 2 MPa, then delivered in a roll through an insulating strip and placed in a heat chamber with a temperature of 220°With 2 hours the content of the binder in the finished insulating material 3 wt.% content slyudinitovyh paper 40 wt.%, the thickness of 0.09 mm, the strength of 16.2 kV/mm volume resistivity at (155±2)°, Om·m 4.6·1011the hardness is at (20±2)°C, N/m-6, the tensile strength, MPa - 38, adhesive strength, MPa - 2, the volatile content of 0.12 wt.%.

Example 2. Process analogous to example 1. Used sljudinitovye paper, basalt fabric, a binder based polyester BA. The content of the binder in the finished material to 4.5 wt.%, content slyudinitovyh paper 30 wt.%, the thickness of 0.11 mm, the strength of 15.5 kV/mm volume resistivity at (155�B1; 2)°S, MD 6·1011stiffness at (20±2)°C, N/m - 6, the tensile strength, MPa - 36, adhesive strength, MPa and 2.7, the volatile content of 0.12 wt.%.

Other examples of the composition and properties of electrical insulating material in physical form tapes are given in table. 1 and 2, respectively.

Since the insulating material based on polyester BA can be made in the form of various physical forms: tape or sheet material of various thicknesses (collector mica), below provides information about the possible implementation of this alternative design, illustrated by examples 10 and 11.

Example 10. Layered composition consisting of slyudinitovyh paper, glass fabric, impregnated with a solution of polyester BA (similar to examples 1-9) with 10 impregnating machines unite in deleteline canvas on the hot calendering at a temperature of 170°C, a pressure of 4 MPa, the time of passing the fabric through rollers 10 minutes After air cooling monolithically material cut into sheets of a certain size, thickness of material, in this example of 0.95 mm, and the sheets are placed in the chamber of the heat treatment with a temperature of 200-240°With 2 hours the content of the binder in the finished material 3 wt.%, slyudinitovyh paper 40 wt.%. Performance in comparison with GOST 26103-84:

1. Shrinkage at constant pressure, % b is more

the proposed material 3

industrial output 8

2. Electric strength, kV/mm

the proposed material 34

industrial output 28

3. Mass fraction of binder, wt.%

the proposed material 3

industrial output 9

4. Volume resistivity, Ohm·m

the proposed material 6·1011

industrial output 1·1011

5. The long-term allowable working temperature °

the proposed material 200-230

industrial output 130-155

6. The ultimate strength in static bending, MPa

the proposed material 160

industrial output 115

Example 11. Layered composition consisting of slyudinitovyh paper, basalt fabric is impregnated with a solution of polyester BA (similar to examples 1-10), obtained from the leaf cut out sheets of the required size and type in the package (for example, 20 layers), then the package is pressed in the hot press at a temperature of 220°C, a pressure of 10 MPa, the pressing time of 3 minutes the material Obtained after cooling in air subjected to heat treatment at a temperature of 200-240°C for 3 hours the Content of the binder in the material 7 wt.%, slyudinitovyh paper 60 wt.%. Indicators GOST 26103-84.

1. Shrinkage at constant pressure, % no more than

the proposed material 2

industrial output 9

2. E. actionsa strength, kV/mm

the proposed material 30

industrial output 24

3. Mass fraction of binder, wt.%

the proposed material 7

industrial output 9

4. Volume resistivity, Ohm·m

the proposed material 1·1012

industrial output 1·1011

5. The long-term allowable working temperature °

the proposed material 200-230

industrial output 130-155

6. The ultimate strength in static bending, MPa

the proposed material 180

industrial output 115

The shelf life of industrially produced materials (on state) of not less than 12 months due to the reactivity of the applied binder after forming material, and the proposed material indicators of shelf life is considerably exceeded, due to the fact that thermoplastic binder is not subject to chemical transformations in time and shelf-life in this case is caused by natural aging of the polymer-36 months and over.

The analysis of the experimental results presented in the examples and tables that show the increase of electrodiagnostic, elasticity, heat resistance of the material obtained with a simultaneous increase of the physical-mechanical characteristics and technology simplification that can be explained by a significant reduction of organic com is Ananta - thermoplastic binder material, a complex structure of polymeric adhesive, formed during the production of dielectric material with the flow of diffusion processes in the surface layers slyudinitovyh paper and increase the adhesive interaction (due to the presence of polar groups in the binder and self-organization of polymer during heat treatment to the substrate.

It is experimentally shown that changing the ratio of components in the direction of increasing the binder content leads to a decrease in electrical characteristics that are associated with increased thickness of the organic polymer adhesive and the changing nature of self-organization during the heat treatment, and reducing the binder content below 3 wt.% leads to a sharp drop physico-mechanical properties and elasticity. Change in the proportion of components in the material in the direction of increasing the content slyudinitovyh paper leads to the reduction of physical-mechanical properties - tensile strength and strength in static bending is lower compared to the state standard, reducing the same content slyudinitovyh paper below 20 wt.% reduces electrical characteristics of the material also lower compared to the standard.

The use of rigid thermoplastic polymers as a binder for composite materials the print materials for civil purposes is restrained due to their high cost and complexity of the synthesis, however, the offer of the claimed technical solution polyester BA obtained from secondary unusable at present, raw materials chemical industry, which significantly reduces the cost compared to industrially produced of rigid-rod polymers. Additional benefits of the proposed technical solution is also easy to obtain polyester BA (mol. m 10000-15000 in the melt of the monomers at a temperature of 255°process time : 4 h and the atmospheric pressure at standard domestic equipment.

Table 1
The composition of the insulating material
The name and contentThe proposed material for exampleKnown tape
component insulating material, wt.%3456789The placeholderSimilar
Kudinova paper203040605050505530
Fiberglass-65 3645-473232
Basalt fabric73    46 --
Binder:7534543  
Polyester BA mol. M 10000-15000         
          
Epoxy resin ED-22       8,725
Polyester resin TF-82       413
Crazyforbargains resin        0,7 
butoxycarbonyl RB         

Table 2
Characteristics and properties of electrical insulating material
IndexThe proposed material for exampleKnown material
 3456789The placeholderSimilar
Thickness0,120,110,10,080,10,100,080,130,15
UD. Volume electric resistance (155±2)°, Om·m6·10118·10116·10116·10116·10116·10116·10116·1011 6·1011
Electric strength, kV/mm152021232122201513
Stiffness at (20±2)°C, n/m8664554919
The tensile strength, MPa403638303536403010
Adhesive strength, MPa2,81,92,61,51,82,22,61,20,5
The binder content, wt.%7463467the 13.438
The content of volatile, wt.%0,150,100,150,100,100,150,150,506,00
Test methods comply with GOST 26103-84

Insulating material containing layers slyudinitovyh paper, under which oku from inorganic fiber, binder containing a polyester resin, wherein the binder contains a polyester-based betulin and adipic acid with a molecular mass of 10000-15000 in the following ratio of components in the material, wt.%:

Kudinova paper 20-60

Polyester-based betwene

and adipic acid with

molecular weight 10000-15000 3-7

A substrate made of inorganic fibers Else



 

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The invention relates to electrical engineering materials, namely, fire-resistant insulating materials intended primarily for the protection of cables, operating in high temperature conditions

FIELD: electrical engineering; insulating materials for wires or commutators of electrical machines.

SUBSTANCE: proposed mica base insulating material has mica paper layer, backing of inorganic fiber (glass or basalt), and binders, such as betulinic and adipic acids having molecular mass of 10 000 to 15 000. Such binders of desired molecular mass can be easily produced.

EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.

1 cl, 2 tbl, 11 ex

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

FIELD: physics; electricity.

SUBSTANCE: fibre glass layer contains out-of-wind fibre glass. It can be woven fibre glass fabric. The material is applied mainly for covering electric conductor, such as wire applicable for high-temperature environments and coils for high-voltage electric motors and generators.

EFFECT: possibility of production of thinner insulation material without deterioration of mechanical or electric properties.

19 cl, 3 tbl, 3 ex

FIELD: chemistry.

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EFFECT: invention increases fire-resistance of the sheath, its flexibility and resistance to mechanical stress, enables to obtain a wire or cable with a lower weight and diameter.

12 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: improved electrically insulating tape (16) is offered which comprises the protective layer (20) and the electrically insulating layer (18) joined with the protective layer (20). At least, one of either the electrically insulating layer (18) or the protective layer (20) includes a set of formed apertures (26) to improve penetration of impregnating pitch into the insulating tape (16) during pitch impregnation.

EFFECT: invention provides optimum impregnation of the tape that improves the ability to resist to impact of voltage and premature breakdown and accident.

10 cl, 11 dwg

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