Electrical insulating tape

 

(57) Abstract:

The invention relates to electrical engineering, in particular to the insulation of electrical products. The tape is impregnated with a polymeric binder, contains mica paper, two sides of which are the substrate on the outer surfaces of which is a trivalent alcohol CH2N-NON-CH2HE. Achieves the improvement of the technological characteristics of the tape. maintaining a high level of electrical characteristics. 3 C.p. f-crystals, 1 table.

The invention relates to electrical engineering, namely, insulating tapes, which are used to create electrical isolation devices (products).

Currently, the most common insulating materials are composite materials. Composites are materials consisting of two or more components with specific properties different from the total of the properties of their components. The latter should be well compatible.

Properties of composite materials cannot be defined only by properties of the components without taking into account their interaction. To create composite mA properties and characteristics, other than the properties and characteristics of the original components. In electrical engineering is widely used one of these composite materials - electrical insulation tape, impregnated with a polymeric binder, based on the mica paper, two sides of which are the substrate, at least one of which is formed of fiberglass (Handbook of electrical materials. So 2/ Ed. by Y. C. Koritski in. A. Pasynkova, B. M. Tareev. -M.:Energoatomizdat, 1987, S. 177-150). This tape provides high electrical insulation characteristics of electrical products, however it does not have the necessary technological characteristics that are required when it is wound on the elements of these devices.

When the winding of the tapes become critical process characteristics, such as elasticity and coefficient of friction. Very often there is no slip of the belt layers and the lack of the necessary degree of tightening. As a result of isolation turns loose with poor adherence layers of tape to each other, the presence of folds and voids. Attempts to eliminate these deficiencies by moistening the tape lead to a significant reduction of electrical characteristics of isolatie electrophysical characteristics ( and in some cases they are even better) insulation. This is due to the fact that insulating tape impregnated with a polymeric binder containing mica paper, two sides of which are the substrate, at least one of which is formed of fiberglass, on the outer surfaces of the substrates is a trivalent alcohol CH2OH-CHOH-CH2OH (technical name - glycerol) in an amount of 1-12% by weight of the total feed. Other quantities of glycerin or do not provide improve the technological properties of the tape, or impair the electrical characteristics of insulation on its basis. The tape according to the invention has 2-3 times the best technological features: high elasticity, low coefficient of friction, long shelf life.

The authors do not know the application earlier in the composition of the insulating tape trivalent alcohol CH2OH-CHOH-CH2OH. In common practice, such products are usually used in the cosmetic industry as components for the preparation of various creams, pastes and ointments. Specified trivalent alcohol is a substance of high hygroscopicity, it is difficult to assume that the use of it in insulating tape will not only worsen the isolation electricityand materials cannot be defined only by properties of the components without taking into account their interaction.

Polymer binder ludomania tapes at normal (room) temperature does not react with trivalent alcohol (glycerol). However, as you can imagine, when processing tape in the insulation of electrical products at 140-160oC a new complex: polymer binder is a trivalent alcohol (glycerol). Apparently, the newly-formed complex gives isolation on the basis of the proposed belt high electrophysical characteristics. In particular, the increase of specific volume electric resistance insulation two orders of magnitude.

Because glycerin is located mainly on the outer surfaces of the tape, it is as though her capsulatum. In the harmful substances that can stand out from the tape in the process of isolation, such as small particles of glass, mica and volatile organic compounds, blocked glycerin and does not enter the environment. The arms of izolirovat contacting harmless and environmentally friendly substance, softened, i.e., the result is similar to the use of biological gloves. A very important advantage of the offered tape is longer shelf life (24 months) without changing Smokie voltage, generated during the operation of laying the tape on the electrical device.

The invention is illustrated by examples of the manufacture of electrical insulation tapes, differing in design, composition of the polymeric binder and the content of glycerol (see table. 1). Structurally, the tapes were of different material and thickness of the substrate, the type and thickness of mica paper, the composition of the polymeric binder. As substrates were used: insulating glass or fibreglass mesh with a thickness of 0.03 - 0.06 mm; polyethylene terephthalate film with a thickness of 0.01 - 0.05 mm; polyimide film with a thickness of 0.03 - 0.06 mm; polyethylene terephthalate paper thickness of 0.01 - 0.06 mm; aramid paper thickness 0,01-0,07 mm as mica paper used: Kudinova paper thickness 0.03 - 0.08 mm; Sudoplatov paper of a thickness of 0.04 to 0.08 mm; mica paper foreign production - samica, rumika, mecaplast thickness of 0.04 to 0.08 mm as the polymeric binder used in the composition based; epoxy and polyester; polyorganosiloxane; epoxy resin and anhydride; polysulfone; polyacrylate. In our experiments we used glycerin different purity: technical; food; chemically Chi technology: fiberglass soaked up in the tub, containing a solution of a polymeric binder. Impregnated fiberglass combined with mica paper, and cloth tape received in the drying zone, where it was subjected to drying at 90-150oC for 5-7 minutes On the output from the last drying zone to the mica paper superimposed polyethylene terephthalate film coated on the inner surface of the layer of the binder. Before combination cloth tape and the varnished surface of the film was the last to dry a little by blowing warm air at 70-75oC.

Combined cloth tape was received at the receiving mechanism of the machine and was tied in a roll. Then the roll was installed in the summer vacation mechanism lakirovanie-drying machine. Cloth tape was laterolog in the process of unwinding roll glycerin. If the number of plotted glycerol was regulated by a special scraper mechanism. After applying the required quantity of glycerin tape came in a drying device to dry a little at 70-80oC for 5-7 minutes Then roll tape cut into the machine on the rollers of the specified width.

The obtained tape was subjected to electro-physical tests.

Example 1. As the polymer binder used is interealty film. The tape contained 1% of glycerin.

Example 2. As the polymer binder and the substrate was used a composition similar to example 1. The tape contained 3% glycerol.

Example 3. As the polymer binder used in the composition based on epoxy resin and anhydride. As substrates we used two fiberglass. The tape contained 6% glycerol.

Example 4. As the polymer binder composition was used on the basis of polyorganosiloxane. As the substrates used were glass and polyimide film. The tape contained 9% of glycerin.

Example 5. As the polymer binder and the substrate was used a composition similar to example 1. The tape contained 12% glycerin.

With the goal of establishing boundary values of the amount of glycerin in the tape were performed control experiments, including experience in the manufacture of tape on the prototype does not contain glycerin.

The properties of the tapes according to examples 1-5, reference examples 1 and 2 and the prototype shown in the table.

As can be seen from this table, in the absence of glycerol, the rigidity of the tape corresponds to 12.0 H/m, and the friction coefficient is 0.9. Such rigidity and Vysocina devices. The content of glycerol in the amount of 1% leads to a decrease of the rigidity of the tape to 5.6 H/m, and the coefficient of friction is reduced to 0.6, and the volume resistivity at (1552)oC on samples of insulation is increased to 6.1010Homme.

When the content of glycerol up to 6% of the stiffness of the tape corresponds to 2.7 H/m, and the coefficient of friction of 0.4. As you can see their examples NN 1-5, change the content of glycerol in the feed from 1 to 12% allows you to adjust the stiffness in the range from 1.5 to 5.6 H/m and the coefficient of friction of 0.2 to 0.6. When this electrical resistivity at (1552)oC on samples of insulation is increased by at least two orders of magnitude, and the warranty period of storage of the tape is increased to 24 months.

Thus, as can be seen from the table, the content of glycerol in the feed in the amount of 1-12% allows to solve in the invention the task of raising the technological characteristics of the tape while maintaining a high level of electrical characteristics.

Sources of information

1. Handbook of electrical materials. So 2/ Ed. by Y. C. Koritski in. A. Pasynkova, B. M. Tareev. -M.: Energoatomizdat, 1987, S. 127-150.

1. Insulating tape to isolate electrotehnica the received substrate, at least one of which is formed of fiberglass, characterized in that on the outer surface of the substrate caused a trivalent alcohol CH2HE IS NON-CH2HE is in the amount of 1.0 to 12.0% by weight of the total tape.

2. Tape p. 1, characterized in that the second substrate is made of fiberglass.

3. Tape p. 1, characterized in that the second substrate is made of polyethylene terephthalate film.

4. Tape p. 1, characterized in that the second substrate is made of polyimide film.

 

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