DE1219554B - Process for the production of insulation from foils or tapes with synthetic resin infusion - Google Patents

Description

Process for the production of insulation from foils or tapes with synthetic resin impregnation Processes for the production of rod insulation are known, in the case of mica-containing webs made of paper or fabric impregnated with epoxy resin wound onto the rods and then cured in a press mold. Here, the synthetic resin impregnation of the insulating strips becomes a hardener or accelerator Immediately added, the result is that the mica-containing insulating strips only stored for a short time due to the hardening of the synthetic resin and processed quickly Need to become.

According to a known proposal, this disadvantage is intended to avoid this that the hardener is applied separately from the insulating sheet on a thin cover sheet that is only applied to the bar insulation together with the insulating sheet on the slot bar is wound up. The mentioned method for the production of rod insulation is however, in many cases unsatisfactory or inapplicable; Apart from the fact that the Manufacturing process through the inclusion of an accelerator containing f) eMbahn is made more difficult, there is the disadvantage that the specified method at any three-dimensional shape having ladders, in particular ladder bars with attached End winding parts are not the production of contiguous, spread over the entire Allows conductor structure extending insulating sleeves.

It is known per se, for conductor structures of any shape, for. B. Bars with attached winding head parts, the insulation made of mica-containing strips build up, the overlapped wound on the conductor structure and then by soaking or immersion with the synthetic resin. Such a procedure has the great one Advantage that all of the interstices arising within the overlapping tapes completely filled by the impregnating resin after a previous evacuation can be. With such an insulation method, however, there are increased Difficulty in soaking the accelerator adequately distributing it to provide.

As an addition of the hardener or accelerator for the reasons given above to the impregnating resin itself for economic reasons, has already been proposed to use accelerator-free resins for synthetic resin impregnation and the Accelerator of the tape-shaped, composite insulating material in tape manufacture to add.

If the tapes or foils are preferably made of a carrier material, z. B. a paper tape, Ülasseidenband, polyester fleece od. Like. And from a mica-containing Layer composed of flake mica and / or mica paper, so can according to the The aforementioned method of the adhesive formed in particular from an epoxy resin for Combination of components of micaceous insulating tape the accelerator contained, which comes into effect during the subsequent impregnation by the synthetic resin and at the elevated temperatures used, the hardening of the wrap bandage penetrating impregnating resin with the incorporation of the adhesive used for the gimmer tape Resin enables.

The invention is based on the idea that one in the aforementioned Processes may be severely restricted with regard to the use of the synthetic resins is when longer storage times for the wrapping tapes or foils cannot be avoided and impairments of the tapes or foils are possible flexibility, processing ability should definitely be excluded. Further can be found in the specified procedure make it annoying that glue and accelerator are preferred in the manufacture of the tape be pressed into completely unevenly distributed cavities. But the latter can have the consequence that the accelerator during the later winding up of the strip material is unevenly distributed, which in turn results in the even distribution of the accelerator questioned during the synthetic resin impregnation of the wrap bandage. is. Furthermore can also, if necessary, in cavities or gaps at bending points or the like Make the lack of the accelerator very unpleasant.

The invention is based on the object of this E; difficulties to be eliminated and optimal conditions nisse for a quick and Uniform curing of the layered carrier material and the synthetic resin produced insulation.

According to the invention, this object is achieved in that the carrier layers (made of tape, mat or foil) by flooding with or immersion in an accelerator-containing, Easily evaporating solvent that is used before impregnation with the impregnating resin is removed again, with the subsequent hardening of the subsequently to be introduced Impregnating resin required accelerators are provided.

Carrier layers that can preferably be used for the process according to the invention Paper webs, glass fabric, synthetic fiber fabric, polyester fleece or other synthetic resin films use. As indicated, the carrier layers have an applied material good insulating properties, such as mica in flake form, mica paper, crushed mica or other substances such as quartz, snow powder and the like Coated or interspersed material, these substances preferably with before the Processing of the carrier layers combined with them by a synthetic resin adhesive are.

The tape material can be impregnated with the accelerator, before the tape material for the production of the insulating body is layered or wound up will. For example, the mat, tape or film material, - its mica - and carrier layers, if necessary, with a synthetic resin that acts as an adhesive (epoxy resin, Polyester resin) are combined, impregnated with the dissolved accelerator and subsequently treated in heat so that the volatile solvent escapes.

The treatment of the material for the purpose of delivering the accelerator can most easily be done here in such a way that the film or tape material in the delivered form as a role in the whole with that in a volatile medium dissolved accelerator is soaked.

In principle, however, it is also possible to use the one that is guided in a path Tape to move through a soaking tank and a drying room from which if necessary, it is fed to further processing after a winding process will.

Deviating from the method described above, however, the accelerator can also be introduced into the strip material in such a way that initially, for example the winding material without accelerator according to its use on the ladder bar, a bobbin or the like wound up and then the wound bandage produced in this way the rod conductor or the coil is penetrated by impregnation with the accelerator. For a pretreatment or for after impregnation with the accelerator Solvent necessary evaporation of the solvent can also be a vacuum and / or higher temperatures are used, which is also used for pretreatment for the Impregnation with the actual impregnating resin can serve, which is introduced with the Accelerator is to be cured.

As can be seen, the method according to the invention enables the tape or film material before or after winding to a sufficient extent to feed the accelerator so that in the subsequent synthetic resin impregnation, the in connection to the impregnation process for introducing the accelerator, if necessary after inserting a limited interim period to remove the volatile Solvent occurs evenly within the wound bandage the accelerator is sufficiently available. However, the latter is more essential Meaning if after soaking the bandage with the accelerator-free one - Epoxy resin uniform curing of the synthetic resin in a satisfactorily short time Time to be achieved.

It is essential for the process according to the invention that as a result of the separate impregnation process with the accelerator any impairments both of the synthetic resin that may be used as an adhesive for the tape or film material as well as the synthetic resin used for the actual impregnation of the bandage, in particular epoxy resin are excluded. As indicated, come with that Method according to the invention as an adhesive for the tape material, in particular, which contains mica especially epoxy resin or mixtures of other epoxy resins without accelerators into consideration. But it is also possible to use such polyester resins or other adhesives to be used when the later hardening of the for the impregnation of the bandage Do not interfere with the accelerator-free resin used and in the impregnating resin of the bandage to be built in.

For the actual impregnation process of the wrap bandage are suitable also especially epoxy resins.

As an accelerator that is used in the special impregnation process Wrapping tapes or the wound tape can be supplied, preferably come the following substances are considered: ditertiary aromatic amine, 4,4 '- (dimethylamino) -diphenylmethane, tertiary aliphatic amine + primary aliphatic.

Amine, leuco malachite green (ditertiary aromatic amine), crystal violet carbinol base (tritertiary aromatic amine), tri-iso-octylamine (tertiary aliphatic amine), ditertiary aromatic amine, boron trifluoride-ethylamine complex, zinc naphthenate, (diprimary aromatic amine, 4,4'-diamino-diphenyl methane).

The substances that can be used as accelerators are in toluene, Acetone or similar easily evaporating solvents dissolved, with the proportion of the accelerator on the liquid solution is on the order of about 0.1 to 30 percent by weight.

The inventive method is not electrical on rod insulation High voltage machines limited; rather, it is also applicable for manufacture of impregnated insulation in converters, transformers and capacitors as well for the production of molded parts, insulating rods, sleeves and plates that consist of one fabric-like or film-like, layered material with impregnation by a means Accelerators may be made of thermosetting resin.

Claims (7)

Claims: 1. Method for producing insulation, in particular for winding bars and the like, as well as insulating bodies made of carrier layers and on top preferably with the use of a synthetic resin adhesive applied substances higher electrical strength are wound or piled up and in which the Wrap or layered dressing with a later hardened resin, in particular epoxy resin, is impregnated, d a -characterized in that the carrier layers (made of tape mat or foil) by flooding with or dipping in an accelerator-containing, light evaporating solvent, which is again before impregnation with the impregnating resin is removed, with that for the later hardening of the subsequently to be introduced Impregnating resin required accelerators are provided. 2. The method according to claim 1, characterized in that the accelerator the tape or film material in a separate impregnation process before winding or layers of the material for producing the insulating body are supplied. 3. The method according to claim 1, characterized in that the tape or film material first od on the insulating rod. Like. Wound or is applied and only here- according to the accelerator contained in a solvent the carrier layer association is supplied in an impregnation process. 4. The method according to claim 2 or 3, characterized in that the composite tape or sheet material prior to feeding the accelerator Treated in vacuo and completely with an accelerator-containing under the application of pressure Solvent is soaked. 5. The method according to claim 2 or 3, characterized in that the solvent is evaporated by the application of heat and / or vacuum and that the heating and / or evacuation process simultaneously as a pretreatment of the Impregnation with the curable impregnating resin is used. 6. Application of the method according to claim 1, 2, 4 or 5 for production the insulation of transformers, converters and capacitors. 7. Application of the method according to claim 1, 2, 4 or 5 for the production of press plates, pipes, rods or molded parts using epoxy, polyester or other synthetic resins. Publications considered: Swiss patent specification No. 305535.