SU149844A1 - Method of producing electrically insulating adhesive varnish for polyethylene terephthalate film - Google Patents

Description

Methods are known for preparing an electrically insulating adhesive varnish for a polyethylene terephthalate film. However, the adhesion of varnish at temperatures up to 150 ° is insufficient.

The proposed method is characterized in that rubber N ° 90, tetraethoxysilane and an organic solvent, which is a mixture of ethyl alcohol, toluene and acetone, taken in a 1: 1: 1 ratio, are used as constituents. This allows the lacquer to give long-lasting adhesion at temperatures up to 150 ° C, low pressure sensitivity and stability at 70% concentration.

In the process, the compacted resilient resin No. 90 (manufactured by HIPI-4) is dissolved in an organic solvent, which is a mixture of ethyl alcohol, toluene and acetone (1: 1: 1). Tetraethoxysilane is then introduced into the solution.

Example. 70 weight. including alccde resin dissolved in 25.1 wt. including mixtures of organic solvents- Then the solution is modified 4.9 weight. including tetraethoxysilane. Lacquer is filtered. Characteristic varnish:

Concentration - at least 70%

Viscosity by viscometer VZ-1 (nozzle f 5.4 mm -1-2 min.

The duration of the drying of the varnish film on copper and temperature of 150 ° - no more than 8 hours. Thermoelasticity of a varnish film on copper at a temperature of 150 ° -100-200 hours.

No. 149844-2 Breakdown voltage, kV1mm:

a) at a temperature of 20 ° - 70-90;

b) at a temperature of 155 ° - 50-60;

c) after being in an atmosphere of 95 + 2%; relative humidity for 24 hours, 50-60.

Specific volume electrical resistance, ohm-cm:

a) at a temperature of 20 ° - 1.0-10;

b) at a temperature of 155 ° - 1,

c) after being in an atmosphere of 95 + 2% relative humidity for 24 hours, 1.0 to 1.5.

Adhesive lacquer provides durable bonding of film / cardboard.

Subject invention

A method of producing an electrically insulating adhesive lacquer for a polyethylene terephthalate film, characterized in that, in order to impart to the varnish long-lasting adhesion at low temperatures up to 150 ° C, low sensitivity to pressure and resistance at 70% concentration, rubber resin is used as components. No. 90, tetraethoxysilane and an organic solvent, which is a mixture of ethyl alcohol, toluene and acetone, taken in a 1: 1: 1 ratio.