Method for manufacturing insulating prepreg

FIELD: electrical engineering; insulating materials.

SUBSTANCE: proposed method for manufacturing insulating materials used in insulators and surge limiters, as well as in manufacturing pipelines, bushes, shells, bearings, wiring insulation of cases includes some additional operations; pre-drying, impregnation, and final drying of prepreg are effected in vacuum chamber and arbor is preheated before prepreg rolling up. Electric strength of prepreg produced by this method is 3.7 to 4.5 kV/mm which is much higher than that of known tubular prepregs.

EFFECT: enhanced quality of fabric surface pre-treatment, improved conditions of impregnation process.

1 cl

 

The invention relates to electrical engineering, in particular to methods for the production of dielectric materials used in insulators and arresters, as well as the manufacture of pipes, sleeves, bearing bushings, insulating the wiring of buildings.

Known methods of manufacturing electrical products on the basis of pre-impregnated materials (prepregs). As the basis of prepregs can be fabric, paper, film, and as the binder components are commonly used compositions based on epoxy resins.

Properties of electrical insulating material, in particular, type a prepreg is largely determined by the properties of the binder. Binder based on thermosetting resins have been used due to their low shrinkage during curing, good dielectric properties and heat resistance. The methods for the production of prepregs, as a rule, consist of two main technological operations. The first is that on the basis of (fiberglass, paper and the like) is applied binder containing the hardener. The second operation consists in drying the impregnated prepreg certain time at a given temperature. The temperature and drying time of the prepreg are chosen to maximize the removal of the prepreg of volatile substances, as well as for Costigan the I effect of the absence of tack-free. For compositions with volatile diluents, their low content and high content of hardeners desired lower temperature and drying time. A higher value of temperature and drying time required for compositions with more severe thinner, more content and a lower content of hardeners. If these dependencies hardness of the manufactured material is reduced. All these processes are well studied, however, the variation of these parameters significant improvements in electrical properties of prepreg does not provide.

So in the application for invention No. 95109303, priority from 16.06.95 g, class H 01 3/00, 3/48, described insulating prepreg on the basis of aramid paper with polyester fibers and thermosetting binder based on epoxy resins containing condensation product of triphenol and epichlorohydrin, tetrabromodiphenylether (or diphenylsulfone), a complex of boron TRIFLUORIDE with benzylamine (or monoethanolamine), solvent. This prepreg is made as follows. The paper is subjected to thermomechanical processing on the calenders. Then, on one or both sides put a method of coating a solution of a binding compound. The resulting intermediate product is passed through a drying chamber to remove solvent.

However, the obtained prepreg does not have quite the full high insulating properties.

In the invention No. 2016003 described the prepreg, which is based on aramid & nylon fabric, and as the binder used anionic sulfacetamide polyurethane. The impregnated fabric is carried out by immersing it in an aqueous solution of the polyurethane dispersion and subsequent drying at room temperature.

Known installation for the manufacture of products of the compound under vacuum to patent No. 2061593 from 03.02.93,, CL 29 With 31/04, 39/42. The system includes a tank for resin and hardener, heater, mixer with the mixing body and the vacuum unit; containers for resin and hardener are heated, so that in them the raw material has reached the required technological state. Next, the raw material is fed into a mixer where it is thoroughly mixed. Then the material vacuumized using a vacuum cap and supplies and under vacuum loaded in shape for manufacturing various types of products. In this case, the vacuum can reduce the loss of raw materials, reduces the duration of the technological cycle, and eliminates air leaks in the mix a lot, which helps to improve the quality of molded products.

In the patent for invention №2029998 from 13.12.91 g, class H 01 3/00, as the basis of the prepreg proposed fabric representing linen paraplegia complex woven with Alannah threads.

The closest solution to offer can be considered a method of manufacturing an electrically insulating material described in the invention of the Russian Federation No. 2094871 of 20.05.93 g, class H 01 3/40, 19/00, 29 To 105:08 B 29 L 24:00.

According to this invention, a woven or paper base soaked in a bath filled with a solution of insulating composition containing thermosetting resin and the complex BF - Amin. Then dried at elevated temperature. Thus prepared cloth tape is wound into a roll, and then cut into clips of given width. To improve the technological parameters of the product in the proposed invention, various additives, which include the compound before impregnation. With this change the drying mode.

According to the invention was able to control the rigidity of the insulating material, but this has not led to a significant improvement of electrostaticaly.

The objective of the proposed solutions increase the dielectric strength of prepregs.

To solve this problem a method of manufacturing a dielectric prepreg includes the steps of pre-drying insulating material, impregnation its binding compound based on epoxy resin, drying the prepreg and collapse it into a roll on the mandrel. From known methods offer differs in that the operation is Yu pre-drying insulating material, it impregnation binder compound and drying the prepreg is carried out in a vacuum chamber, and before the collapse of the prepreg roll mandrel is preheated.

In addition, the binder compound add coalescent WOOK-555.

As the mandrel using a cylindrical tube.

Compound based on epoxy resin includes hardener - anhydride isomethyltetrahydrophthalic and accelerator for the curing of epoxy resins UE 606/2.

Use in the way that new operations can more efficiently prepare the basis of the prepreg for the operation of impregnation, and also increases the efficiency of impregnation.

So pre-drying insulating material in vacuum, and the impregnation of the prepreg under vacuum allows you to remove from its surface adsorbed moisture and volatile substances, and also eliminates possible porosity of the product, thereby increasing the mechanical and dielectric properties of the finished prepreg.

The introduction of additives in the form of coalescent WOOK-AND 555 in the composition of the compound contributes to the complete removal of air from a compound that affects the quality of impregnation of the material and also contributes to the solution of the task.

The method is implemented as follows.

As an insulating material selected fabric insulating EZ-200 P(115)-763 GOST 19907-83. the Kan is a continuous fibrous material with white glass woven filament yarn, made plain weaves. The width of the fabric is 1150 mm, and the thickness 0,190 mm

Pre-drying fabric is performed on the machine of special design in vacuum at a temperature (150±5)°With its continuous movement with a speed of 3 m/min over the heated surface. In the process of pre-drying the fabric surface are removed volatile matter and adsorbed moisture, and eliminates possible porosity of the product, thereby increasing the mechanical and dielectric properties of the final product.

Further, also in the vacuum chamber are impregnated fabric binding compound. The compound is a low viscosity liquid from dark yellow to light brown. The compound consists of a resin epoxy ED-20, hardener - anhydride someinteresting (IMTFE) and accelerator curing epoxy resins UE 606/2. Compound supplemented by coalescent WOOK-555, which helps to remove air from the compound. The gelation time of the compound is 6.0 to 6.5 hours at a temperature of (50±2)°C. the Impregnation is carried out by pulling the fabric through the bath with the compound. At the ends of the fabric is fixed on the rotating rollers that automatically feed the fabric into the bath. The operation of impregnation is carried out with 1 mm RT. Art. and with a speed of 0.8 m/min

The impregnated and dried fabric is wound on pre-heated to a temperature (65±5)°With technological mandrel in the form of a hollow cylinder (pipe). In the process of winding the prepreg is heated to a temperature of 50±2°by continuous rotation of technological mandrel with prepreg in a heating Cabinet.

Finished product is a tube (cylinder) steklotekstolity epoxy-novolak T (C)the SEF with an electric strength of 3.7 to 4.5 kV/mm, which is significantly higher than all known tubular prepreg.

Thus, due to the additional operations of the proposed method achieved a more thorough preparation of the surface of the fabric, as well as improved operations impregnation, thereby improving the basic quality of the prepreg - electric resistance. In addition, it is possible to speed up the process and reduce energy consumption.

A method of manufacturing a dielectric prepreg, comprising the operations of pre-drying insulating material of the fabric, impregnated her binder compound based on epoxy resin, drying the impregnated fabric and folding it into a roll on the mandrel, wherein the operation of pre-drying insulating material, the impregnation and drying the impregnated material is carried is collected in the vacuum chamber, as the insulating material from a tissue selected fabric EZ-P, which is pre-dried at a temperature 145-155°linking compound contains coalescent, isomethyltetrahydrophthalic anhydride and a catalyst for the curing of epoxy resins with time gelling compound 6-6,5 h, at a temperature of 48-52°With, before collapsing impregnated material into a roll mandrel in the form of a cylindrical tube is heated to a temperature 48-52°C.



 

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FIELD: electrical engineering; insulating materials.

SUBSTANCE: proposed method for manufacturing insulating materials used in insulators and surge limiters, as well as in manufacturing pipelines, bushes, shells, bearings, wiring insulation of cases includes some additional operations; pre-drying, impregnation, and final drying of prepreg are effected in vacuum chamber and arbor is preheated before prepreg rolling up. Electric strength of prepreg produced by this method is 3.7 to 4.5 kV/mm which is much higher than that of known tubular prepregs.

EFFECT: enhanced quality of fabric surface pre-treatment, improved conditions of impregnation process.

1 cl

FIELD: the invention describes the method for manufacture of a high-voltage insulator with an elongated central solid or hollow body, plastic casing and one or several plastic sheds.

SUBSTANCE: the method consists of several stager: the casing from plastic is obtained by means of casting or extrusion for the solid or hollow body; the sheds are formed from plastic; the plastic of the casing and/or the plastic of the sheds is partially stitched, and whenever necessary, the incompletely stitched plastic of the casing or shed are stitched completely, the shed is fastened on the specified place on the casing, and the obtained blank of the high-voltage insulator is stitched completely. The silicon rubber contains at least two stitching catalysts reacting at various temperatures, or at least two inhibitors suppressing the reacting of connection at various temperatures.

EFFECT: facilitated procedure.

28 cl, 3 dwg

FIELD: manufacture of column-shaped high-voltage bushing insulators.

SUBSTANCE: proposed bushing insulator has symmetrical hollow cylindrical external insulator 1 with lead-through head 2 supported by one of its butt-ends and designed for connection to high-voltage supply. Resting on opposite end of insulator is lead-through base 3 designed for connection to ground potential. Proposed method involves sequential fitting of lead-through base 3, external insulator 1, and lead-through head 2 on drawing frame 5; lead-through base 3 rests in this case on insulating case 6. Lead-through base 3 and lead-through head 2 are tightly fitted to one another through drawing frame 5 that mounts insulating case 6. Clamping member 21 made for shifting in axial direction is installed on flange 22 of lead-through head 2 prior to fitting the latter on drawing frame 5; head flange 22 and clamping member 21 are pressed against one another to produce pre-tensioning force. During next fitting of pre-tensioned lead-through head 2 clamping member 21 is secured on end of drawing frame 5 passed through insulator 1, and then clamping member 21 is taken off head flange 22 to form negative allowance.

EFFECT: enhanced economic efficiency in manufacturing high-voltage bushing insulator.

7 cl, 2 dwg

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EFFECT: the invention ensures the shorten duration of the material molding and curing, that reduces the production time of the insulators.

12 cl, 3 dwg

FIELD: electrical engineering.

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EFFECT: ability of producing high-voltage parts having relatively small diameter.

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FIELD: electrical engineering; polymeric insulators and their manufacturing process.

SUBSTANCE: proposed composite insulator manufacturing process includes skeleton fixation in winding mechanism that rotates it about longitudinal axis at the same time moving skeleton along its axis, production of profiled band from T-section silicone rubber band by means of extruder, installation of fin in a spaced relation between turns followed by its rolling-on. Skeleton rotating and moving mechanism is inclined relative to extruder through angle equal to that of fin inclination. Fin is thickened at least on one end of base and this end is flattened in the course of rolling to fill up clearance between adjacent turns. Then part obtained is polymerized and wiring hardware is mounted thereon.

EFFECT: facilitated manufacture, improved termination of silicone finning edge.

1 cl, 2 dwg

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