Insulating composition

 

(57) Abstract:

Usage: the invention relates to electrical engineering, in particular compositions for the manufacture of coatings for electrical steels for magnetic circuits of electrical machines and devices. The objective of this invention is to provide a dielectric composition with high water and moisture resistance of electrical insulating coating while maintaining its high physical-mechanical properties. The inventive composition comprises, in wt.%: 46 - 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35: 65 wt.% - 18 - 36, phosphate ions (in terms of IN2ABOUT5) - 7,24 - 15,8, polyoxyethylene ether - 1,8 - 3,6, ions of aluminum (Al3+) - 0.1 to 0.3, magnesium ions (Mg2+) - 0,22 - 1,1, ions of boron (in terms of IN2ABOUT3) - 0,012 - 0,088, water - the rest. table 1.

The invention relates to the field of processing of steel for the production of dielectric coatings on its surface and can be used in metallurgy.

Known insulating composition to obtain a coating for electrical steel using manifestatio binder. The disadvantages of this structure are low physics is the composition (patent RF N 1704169, N1, 1992), which contains, by wt.

phosphoric acid or 7,6 13,8

phosphate ions (in terms of P2O5) 5,51 9,99

46 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35:65 wt. 10 20

valerolactam or 0,005 0,015

butyrolactam fraction of fatty alcohols C7-C120,1 0,3

water the rest

The disadvantage of this exposure are low water and moisture resistance of electrical insulating coatings.

The objective of this invention is to provide a dielectric composition with high water and moisture resistance of electrical insulating coatings while maintaining high physical-mechanical properties.

This object is achieved in that on the electrical steel sheet is applied a composition comprising, by wt.

46 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35 to 65 wt.%. 18 36

phosphate ions (in terms of P2O5) 7,24 15,8

polyoxyethylene ether 1,8 3,6

the aluminum ions (Al3+) 0,1 0,3

magnesium ions (Mg2+) 1,1 0,22

ions of boron (in terms of B2O3) 0,012 0,088

water the rest

The composition is prepared by direct mixing of butadiene-stiralnaja compounds. The viscosity B3 4 at 20oC 14 20 C. In all examples, the electrical steel samples were processed within 5 s at a temperature of 205oC. the Excess solution was removed by squeezing rubber rollers. The coating was subjected to heat treatment at a temperature of 400oC for 60 S.

Physico-mechanical properties of the coatings is determined by bending the samples on a cylindrical mandrel with a diameter of 3mm Reducing the wear on the cutting elements of the stamp is compared with manifestati the floor.

Under the water resistance refers to the resistance of the coating to moisture absorption and diffusion permeability; moisture resistance resistance to high heating air humidity at a certain temperature environment.

Methods for determination of moisture absorption and moisture resistance is described in [2]

The compositions of the insulating compositions and properties of coatings based on them are given in table. 1.

As can be seen from the table, the introduction 46 47% of butadiene-styrene latex, phosphate ions, polyoxyethylene ester, ion Al3+, Mg2+and boron in amounts above and below the declared concentration (see examples 4, 8, 9, 13, 14, 18, 19, 23, 24, 28, 29, 33) leads to the reduction of water and moisture resistance, electroic coatings, received the prototype.

This goal is achieved by the combination of all the characteristics claimed in the solution.

The use of the proposed composition can improve the quality of insulation coating that is important in the operation of the rolled electrical steel in conditions of high humidity.

Insulating composition to obtain a coating for electrical steel, containing 46 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35 to 65 wt. phosphate ions, characterized in that it additionally contains polyoxyethylene ether, and ions of aluminum, magnesium and boron in the following ratio, wt.

46 47% styrene-butadiene latex with a ratio of butadiene and styrene in the copolymer of 35 to 65 wt. 18 36

Phosphate ions (in terms of P2O5) 7,24 15,8

Polyoxyethylene ether 1,8 3,6

The aluminum ions (Al3+) 0,1 0,3

Magnesium ions (Mg2+) 1,1 0,22

Ions of boron (in terms of B2O3) 0,012 0,088

Water Ostalnoe

 

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