SU1345266A1 - Method of insulating articles with epoxy compounds - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to electrical insulation technology. The purpose of the invention is to reduce the cure time by accelerating the buildup, viscosity of the compa-; Onda on the surface of the product while maintaining the high technological viability of the compound. The product is impregnated by immersion into the epoxy composition in a vacuumized autoclave, ammonia is fed there and held in its atmosphere for 10-15 minutes at the impregnation temperature, after which the product is subjected to heat treatment. After exposure to ammonia on the surface of the product, a continuous film of the cured compound appears, which completely prevents it from flowing out when the product is moved to the next operation. Similarly, do and in the vacuum pouring product. i (L so j: ate joint venture) O)

Description

This invention relates to an insulating technique, in particular, to a technique for curing epoxy compositions during the manufacture of an insulator.

The purpose of the invention is to reduce the curing time by accelerating the increase in viscosity of epoxy compounds in 1x treated products while maintaining the high technological viability of the main, reusable compound mass.

The goal is achieved by the fact that the curing of epoxy compounds in the products they have processed is carried out after a retention within 10-15 minutes in an atmosphere of ammonia.

After exposure to ammonia on the surface of the product, a continuous film of the cured compound arises, which completely prevents it from leaking when the product is transferred to the curing furnace and thermal sample Example 4, Curing time of the casting compound UP-5-111-3, consisting of epoxy resin - hydride hardener, is

bots.

Example 1, Processed 25 at 100 + 5 C 5.5 ± 0.5 hours. After pre-filling, the product (electrical winding treatment in an ammonia atmosphere) is insulated for 10 minutes at With a temperature tape, placed in an autoclave, where the compound is 55 ± 5 ° C on its surface after being evacuated, a continuous film is partially impregnated by immersing the product in an epoxy-30 cured compound. With an elevated composition of 100 mash. Temperatures up to 100 + 5 ° С ED-22 epoxy resin film and 100 May “h. hardener - ivomethyltetrahydrofta-left anhydride, with a temperature of 50-55 0,

After draining the remains of the composition and draining it off, the product is placed in an airtight container, into which, after evacuation, to 1-5 mm Hg. ammonia is supplied until an atmospheric pressure is created in the vessel. For 12 minutes, a partially cured (polymerized) composition film is formed on the surface of the product to prevent it from flowing. After removal of the 45 partially polymerized ammonia (by vacuuming) of the compound, reduce leakage and

35

goes into a viscous state and dissolves in the rest of the compound. The cure time of such a compound is 4.0 + 0.2 hours.

In all examples, the technological viability of the bulk of the impregnating and casting compositions and compounds, determined by an experimental method, remained the same in comparison with the control samples.

As can be seen from the examples, the use of the proposed method allows, through the formation of continuous plenum, to be transferred to a heat treatment furnace.

The composition on the surface of the product is cured at 150 + 5 ° C for 1.2 + 0.1 hours. The composition not treated with ammonia cures 2.0 to ± 0.1 hours. The viscosity of the composition not treated with ammonia (flowing from the product) after heating the product to 150 + 5 ° С 40-45 s (according to VZ-4), treated 60-65 s.

Example 2. A product impregnated with an epoxy composition (as in example 1) with a temperature of 60-65 ° C is placed in an airtight container and treated with ammonia as in example 1. A film of partially cured composition is formed on the surface of the product for 10 minutes. The curing time of the composition at 150 ± 5 ° C is reduced from 1.8 + 0.1 h to 1.0 + 0.1 h.

Example 3. On the surface of a product treated with an epoxy composition with a temperature of 40-45 ° C and ammonia in Example 1, an uninterrupted film of a partially cured composition is formed in 14-15 minutes. Time

curing the composition at 150 ± 5 ° C reduces from 2.5 + 0.1 h to 2 + 0.1 h. The viscosity of the composition unwrought by ammonia (resulting from the product) at 6Cfc, after heating the product to 150+

+ Y: 32-36 with (PoVZ-L), processed 55-60s.

Example 4, the curing time of the casting compound UP-5-111-3, consisting of epoxy resin and anti-hydride hardener, is

Pu 100 + 5 C 5.5 ± 0.5 hours. After preliminary treatment in an ammonia atmosphere for 10 minutes at an ommpound temperature of 55 ± 5 ° C, a continuous film of partially cured compound appears on its surface. When the temperature rises to 100 + 5 ° С, the film

 partially polymerized compound to reduce leakage and loss

goes into a viscous state and dissolves in the rest of the compound. The cure time of such a compound is 4.0 + 0.2 hours.

In all examples, the technological viability of the bulk of the impregnating and casting compositions and compounds, determined by experimental means, remained the same in comparison with the control samples.

As can be seen from the examples, the use of the proposed method allows, due to the formation of continuous pleo-epoxy compounds when moving products into a heat treatment furnace, to accelerate the increase in viscosity and decrease

gQ is the curing time of the impregnated or cast products. This allows reducing the irreversible loss of epoxy compounds and energy consumption, increasing the throughput capacity of heat treatment furnaces.

Claims (1)

The invention of the method of insulating products with epoch and sulfur compounds, including vacuum impregnation or casting and thermo313452664 processing before curing, about tl and h a-high technological viability, and in order to reduce the compound, the impregnated product This curing time by heat-treating before heat treatment is Renee increase in viscosity by compounding the atmosphere of ammonia for 10-15 minutes on the surface of the product while maintaining the temperature of impregnation or pouring.