Electrical insulating polyesteramide varnish

FIELD: polymer materials.

SUBSTANCE: insulating varnish for coating enameled wires contains polyester resin, titanium catalyst, and organic solvents, titanium catalyst being, in particular, tetrabutoxytitanium and organic solvents being petroleum solvent and cresol solvent 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 on polyester resins. The closest in technical essence of the present invention is an insulating varnish PE-A (Toy, Two, Yevtuhova. Insulating varnishes, M., Chemistry, 1981, 49), which is composed of polyester resin, organic solvents (tricresol and solvent), tetrabutoxide.

To obtain a varnish PE-A use expensive tricresol grade (GOST 2264), having the following composition % (by volume):

up to 180°With not more than 5

from 180 to 205°With not less than 85

up to 210°With not less than 95.

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

The essence of the invention lies in the fact that a lacquer, which include polyester resin, obtained by the interaction of dimethyl terephthalate with ethylene glycol and glycerol with an excess of an alcohol component, a solvent, tetrabutoxide and kretly 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 10° With not more than 3

from 190 to 205°With not less than 70

up to 210°With not less than 85.

Method for producing electrical insulating varnish next. In a reactor equipped with a stirrer, reflux condenser and thermometer, upload polyester resin and kretly solvent. The resulting mass is heated to 130-140°and mixed, and then the resin solution is cooled to 90-100°and introducing the mixture krasilnogo solvent and solvent. After the resin solution to 60°With, introducing the catalyst in crezygnom solvent. After filtration get ready enamel-lacquer.

Technical result achieved when using this invention, is as follows:

- reducing the cost of the varnish due to the exclusion of the lacquer composition costly tricresol and replacing it with kretly solvent resulting from the processing of coal oil;

- improving the quality of the finished product.

The invention is illustrated by the following examples:

Example 1.

In a reactor equipped with a stirrer, thermometer and reflux condenser, download 536 g of polyester resin and 500 g krasilnogo 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 3.0

from 190 to 205°71

up to 210°85.

P is obtained mass is heated to 130° C and stirred, and then the resin solution is cooled to 90°and introducing a mixture of 46 g krasilnogo solvent and 205 g of solvent. Stirring is continued for 3 hours. After the resin solution to 60°With injected a solution of 9 g of tetraethoxysilane 51 g krasilnogo solvent and stirred for 1 hour. After filtration get ready enamel-lacquer in the amount of 1300

Example 2.

In the conditions of example 1 of 536 g of polyester resin, 205 g of the solvent, 9 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°With 2.5

from 190 to 205°75

up to 210°90

get ready enamel-lacquer in the number 1296

Example 3.

In the conditions of example 1 of 536 g of polyester resin, 205 g of the solvent, 9 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°From 2.9

from 190 to 205°83

up to 210°With 95

get ready enamel-lacquer in the number 1310

Example 4.

In the conditions of example 1 of 507 g of polyester resin, 205 g of solvent, 8.5 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°With 3.0

from 190 to 205°71

up to 210°85

get ready enamel-lacquer in number 1290

Example 5.

In the conditions of example 1 of 507 g of polyester resin, 205 g of SOLV the NTA, 8.5 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°With 2.5

from 190 to 205°75

up to 210°90

get ready enamel-lacquer in the number 1287,

Example 6.

In the conditions of example 1 of 507 g of polyester resin, 205 g of solvent, 8.5 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°From 2.9

from 190 to 205°83

up to 210°With 95

get ready enamel-lacquer in the number 1292,

Example 7.

In the conditions of example 1 of 552 g of polyester resin, 205 g of solvent, 9.4 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°With 3.0

from 190 to 205°71

up to 210°85

get ready enamel-lacquer in the number 1340

Example 8.

In the conditions of example 1 of 552 g of polyester resin, 205 g of solvent, 9.4 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°With 2.5

from 190 to 205°75

up to 210°90

get 1338 g of lacquer.

Example 9.

In the conditions of example 1 of 552 g of polyester resin, 205 g of solvent, 9.4 g of tetraethoxysilane and 597 g krasilnogo solvent having the following fractional composition, % (by volume):

up to 180°From 2.9

from 190 to 205°83

up to 210°With 95

get ready enamel-lacquer in the number 1342,

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 follows from the data table, lacquer PE-943 And received on crezygnom solvent, provides the enameled wires that meet the IEC requirements for cables with polyester insulation with temperature index 130.

No. of sample lacquerPE-943 A (prototype)
123456789
Characterization of Lac:
a) viscosity of the OT-412013513010011095140145160145
b) mass fraction of non-volatiles, %34,535,234,732,9 33,032,536,035,836,035,0
Feature an enamel-wire (wire diameter 1 mm)
a) the breakdown voltage, In97009300950095009400920098001000097009000
b) fur. strength, number of double strokes of the needle>100>100>100>100>100>100>100>100>100>100
C) thermal shock (ratio of diameter)5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)
5d

(160°)

Insulating varnish for enameling wire containing polyester resin, a titanium catalyst and an organic solvent, is great for the decomposing those as titanium catalyst contains tetrabutoxide, and as organic solvents solvent and 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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