Electrical insulating polyesteramide varnish

FIELD: polymer materials.

SUBSTANCE: insulating varnish for coating enameled wires contains polyesteramide resin cresol solvent, petroleum solvent, and tetrabutoxytitanium, said cresol solvent being the one recovered by treatment coal oil and consisting of phenol, o-, m-, and p-cresols, and xylenols, which has following fraction composition (by volume): up to 180°C not more than 3%, 190-205°C at least 70% and up to 210°C at least 85%.

EFFECT: lowered cost price of varnish and improved quality of finished product.

1 tbl, 9 ex

 

The invention relates to polymer chemistry, in particular for insulating paints, varnishes and lacquers for coating of enamel wires.

Known electrical insulating varnishes based polyetherimide resins. The closest in technical essence of the present invention is a dielectric composition (Ed. mon. The USSR №943859, N 01 3/42, Z. 02.06.81 g, op. 15.07.82, BI No. 26.), containing oligophrenic, aromatic solvent and tetrabutoxide.

As an aromatic solvent, a mixture of cresol and solvent. Wire, enameled this composition satisfies the requirements of enamelled wires with temperature index 155.

The objective of the invention is the expansion of raw materials, replacement of expensive cresol and reducing the cost of varnish.

The essence of the invention lies in the fact that the proposed electrical insulating varnish, which includes polyetherimide resin obtained by condensation trimellitic anhydride and aromatic diamine with terephthalic acid oligoesters containing hydroxyl groups, solvent, tetrabutoxide and kretly solvent, selected by the processing of coal-oil, and consisting of phenol, o -, m-, p-Cresols and xylenols following fractional composition % (by volume):

up to 180°With no more than 3

p> from 190 to 205°With at least 70

up to 210°With not less than 85

Technical result achieved from the implementation of the present invention is to reduce the cost of the lacquer to improve the quality of the finished product due to the exclusion of the lacquer composition costly tricresol and replaced by kretly solvent resulting from the processing of coal oil.

Method for producing electrical insulating varnish next. In a reactor equipped with a stirrer, reflux condenser and thermometer, download polyetherimide resin and kretly solvent. The resulting mass is heated to 150°and mixed, and then the resin solution is cooled to 90-100°With the injected mixture krasilnogo solvent with solvent and stirred for 3 hours. After the resin solution to 60°With, introducing the catalyst in crezygnom solvent and stirred for 1 hour. After filtration get ready enamel-lacquer.

The invention is illustrated by the following examples.

Example 1.

In a reactor equipped with a stirrer, thermometer and reflux condenser, load 580 g polyetherimide resin and 440 g krasilnogo solvent, selected by the processing of coal-oil, and consisting of phenol, o-, m-, p-Cresols and xylenols next fractional composition, % (by volume):

up to 180° - 3,0

from 190 to 205° - 7,0

up to 210° - 85,0

The resulting mass is heated to 150°and mixed, and then the resin solution is cooled to 90-100°and introducing a mixture of 54 g krasilnogo solvent and 166 g of solvent. Stirring is continued for 3 hours. After the resin solution to 60°C, introduce a solution of 9.6 g of tetraethoxysilane 54 g krasilnogo solvent and stirred for 1 hour. After filtration get ready enamel-lacquer in the number 1270

Example 2.

In the conditions of example 1 of 580 g polyetherimide resin, 166 g of solvent, 9.6 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°C - 2.5

from 190 to 205°s - 75

up to 210°S - 90

get 1280 g enamel varnish.

Example 3.

In the conditions of example 1 of 580 g polyetherimide resin, 166 g of solvent, 9.6 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°S - 2,9

from 130 to 205°C - 83

up to 210°C - 95

get ready enamel-lacquer in the number 1280,

Example 4.

In the conditions of example 1 of 556 g polyetherimide resin, 166 g of solvent, 9.3 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180° - 3,0

from 190 to 205° - 71,0

up to 210°-85,0

get ready enamel-lacquer in the number 1260

the example 5.

In the conditions of example 1 of 556 g polyetherimide resin, 166 g of solvent, 9.3 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°C - 2.5

from 180 to 205°s - 75

up to 210°S - 90

get 1265 g of lacquer.

Example 6.

In the conditions of example 1 of 556 g polyetherimide resin, 166 g of solvent, 9.3 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°S - 2,9

from 190 to 205°C - 83

up to 210°C - 95

get ready enamel-lacquer in the number 1259,

Example 7.

In the conditions of example 1 of 603 g polyetherimide resin, 166 g of solvent, 10.0 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180° - 3,0

from 190 to 205° - 71,0

up to 210° - 85,0

get ready enamel-lacquer in the number 1305

Example 8.

In the conditions of example 1 of 603 g polyetherimide resin, 166 g of solvent, 10.0 g of tetraethoxysilane and 548 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°C - 2.5

from 190 to 205°s - 75

up to 210°S - 90

get ready enamel-lacquer in the amount of 1300

Example 9.

In the conditions of example 1 of 603 g polyetherimide resin, 166 g of solvent, 10.0 g of tetraethoxysilane and 548 g krasilnogo solvent, imeushih the following fractional composition, % (by volume):

up to 180°S - 2,9

from 190 to 205°C - 83

up to 210°C - 95

get ready enamel-lacquer in the number 1310

Samples of varnish was used for enameling wire on the adopted technology.

The results of the tests of varnishes and enamel wires shown in the table.

As can be seen from table, the proposed lacquer provides reception of enameled wires meeting the requirements of IEC wire polyetherimides insulation with temperature index 155.

Insulating varnish for enameling wire containing polyetherimide resin, kretly solvent, solvent and tetrabutoxide, characterized in that as krasilnogo solvent it contains kretly solvent, selected by the processing of coal-oil, and consisting of phenol, o-, m-, p-Cresols and xylenols next fractional composition, vol.%: up to 180°With not more than 3; from 190 to 205°With not less than 70; 210°With not less than 85.



 

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