SU858120A1 - Method of impregnating glass filler with binder - Google Patents

Description

(54) METHOD OF DRINKING GLASS-CONTAINING BONDING METHOD

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The invention relates to the field of methods for the impregnation of glass filler to a binder, applied to the mandrel used in the manufacture of hollow products for electrical purposes.

For the continuous impregnation of a bundle of fibrous material, a method is known that consists in pulling through series-connected evacuation, pressure impregnation and evacuation chambers, the sealing elements l are installed at the inlet and outlet of which. However, due to the bulkiness of the impregnated assemblies and additional devices for creating a vacuum, they cannot be installed on a device that performs a circular rotation around the mandrel.

The closest in its essence and the achieved result to the proposed is a technical solution, which consists in installing a glass-fiber on a disk rotating in a vertical plane and inserting the glass-fiber into a container located on the disk with a binder, and pulling it through the last 2.

The disadvantages of this method are that the air inclusions in the filler, which are formed when it is immersed in the solution, prevent

10 high-quality and complete impregnation of the filler, as well as over-expenditure due to the forced application of it in larger quantities than is required.

The purpose of the invention is to increase the quality of impregnation and save the binder.

Claims (1)

The goal is achieved by using an airtight container into which glass-fiber is inserted in the direction opposite to the centrifugal force on the binder, after which the glass-fiber is degassed in the free space of the sealed container and reintroduced into the hydraulic wedge as it exits the container. The drawing shows one of the possible devices with which the glass filler can be impregnated according to the proposed method. The method of impregnating the glass filler to a binder spiral-wound on a mandrel mounted on a rotor in the vertical plane of the rotor is as follows. A reel 1 with a glass-filler 2 and a sealed impregnation bath 3 are mounted with a disc rotating in the vertical plane 4. The glass; the filler 5, to be impregnated, is passed through the guide sleeve 5 and the seal 6 of the inlet from the version, the seal 7 and the guide sleeve B of the outlet after which it is attached to the mandrel (mandrel) 9, on which it will be wound. When the disk rotates under the action of centrifugal force, the binder 10 is pressed against the inlet of a sealed impregnation bath. In this case, an increased pressure is created in the binder. At the same time, a free space 11 is formed between the binder (i) and the outlet of the glass filler, which helps to remove air inclusions from the impregnated glass fill and the binder due to its discharge, created by the centrifugal force and the binder flow. Then the glass filler passes through the hydraulic wedge formed in the outlet sealant funnel due to the excess binder remaining on the glass filler after the initial impregnation under pressure. The glass filler is pulled through the hermetic impregnation bath by winding it onto the mandrel as the disc rotates. It is advisable, when impregnating dense or woven glass fillers, to act overpressure at an angle to the opposite direction of movement of the glass filler. The best results are achieved if the rotational speed of the bath is selected so that the circumferential velocity of the liquid point, most distant from the axis of rotation, is 3-5 m / s According to the proposed method, a tube of 30 mm and 4 mm thick steamer 4 mm was made, consisting of three layers: an inner one of unidirectional fibers 1.5 mm thick and two spiral 1.25 mm thick, wound on the inner layer in different directions. In this case, glass roving (bundles) of the brand RBN-10-2520-78 (roving of glass filaments with a linear density of 2520 tex on lubricant No. 78) was used for all layers. All layers are interconnected with a thermosetting binder of the following composition, wt%: Resin epoxy-Dianova uncured grade ED-2056 Anhydride iso-methyltetrahydrophthalmic A and B grades 43.2 Accelerator A-31-.1.5 0.8 Normal density of used the binder is equal to 1.2 g / cm; the speed of the pipe movement was 432 mm / min; the step of winding the spiral layers was 4 mm. The winding of the spiral layers was carried out with four bundles, each of which was carried out in an individual hermetic bath, according to the device close to the drawing. A 25 mm unidirectional fiber tube with a change thickness of 1.5 mm, previously obtained by drawing, was used as a mandrel. Wound in different directions, on each other, two layers with a pitch of 4 mm. In this case, the unidirectional tube was preheated to 160 ° C and at this temperature, the annular layers were wound, followed by heat treatment in a thermal furnace. Using the proposed method of impregnating a glass filler to a binder, as compared with the known methods, the almost complete removal of air inclusions introduced by the glass filler into the binder, as well as significant binder savings, while ensuring stable mechanical and dielectric characteristics. The invention of the glass fiber impregnation method is connected with an adhesive consisting in installing a glass fiber on a disc rotating in a vertical plane, and