JPH01317712A - Method for impregnating base material with varnish - Google Patents

Abstract

PURPOSE:To obtain a resin impregnated base material having no air bubbles by immersing a base material in a solvent tank equipped with an ultrasonic generator and subsequently guiding the base material to a varnish tank to impregnated the same with varnish. CONSTITUTION:For example, a paper-base material 1 is immersed in a solvent tank 4 equipped with an ultrasonic horn 3 having water 2 received therein and the fibers of the paper base material are loosened each other to expel air bubbles in the base material and, subsequently, the base material thus treated is guided to a varnish tank 7 having phenol resin varnish 6 received therein through an air-drying process to be impregnated with the phenol resin varnish 6. After impregnation, the base material is moved by squeeze rolls 8 while the resin content thereof after drying is adjusted to 50wt.% to obtain a resin impregnated base material 9 having no air bubbles. As the solvent, water, methyl alcohol, ethyl alcohol, acetone, cyclohexanone or styrene monomer are used in general and the varnish to be used is prepared by adding a solvent such as water, methyl alcohol, acetone, cyclohexanone or the like to one of a phenol resin, an epoxy resin, an unsaturated polyester resin, a melamine resin or a modified resin thereof or a mixture thereof if necessary. As the base material, a fabric, a nonwoven fabric, paper, a mat or the like composed of an inorg. fiber, an org. fiber or a natural fiber such as cotton is used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for impregnating varnish into decorative board substrates, laminate board substrates, multilayer wiring board substrates, and the like.

[Conventional technology]

Conventionally, when producing prepreg by impregnating and drying varnish into decorative laminate substrates, laminate board substrates, and multilayer wiring board substrates such as paper, cloth, and woven glass fabric, the substrate is placed in an impregnating tank containing varnish. The base material is impregnated with varnish, but the air contained in the base material is impregnated, and as a countermeasure to this, it is possible to install an ultrasonic generator in the varnish tank. A widely practiced lie.

[Problem that the invention seeks to solve]

As described in the conventional technology section, even if the base material is impregnated with varnish using a varnish bath equipped with an ultrasonic generator, which is currently widely used, the cavitation created by the ultrasonic generator will cause air bubbles to form on the road. The effect will be reduced because it will remain. The present invention has been made in consideration of the above-mentioned problems in the prior art, and its purpose is to provide a method for impregnating a base material with varnish that can obtain a resin-impregnated base material without air bubbles. be.

[Means for solving problems]

The present invention is a method of impregnating a base material with varnish, which is characterized in that the base material is immersed in a solvent tank equipped with an ultrasonic generator, and then introduced into a varnish tank to impregnate the base material with varnish. The air contained in the varnish is quickly released into a low-viscosity solvent such as water or a solvent, and the air bubbles that are released are immediately released into the air from the low-viscosity solvent, so even when varnish is impregnated, there are no air bubbles. The present invention will now be described in detail.

The solvent used in the invention may be any solvent as long as it is compatible with the varnish used, and generally water or organic solvents such as water, methyl alcohol, ethyl alcohol, acetone, cyclohexanone, styrene monomer etc. are used, as long as they are compatible with the varnish used. can be used. The ultrasonic generator may be any device that generates ultrasonic waves, such as an ultrasonic horn, and is not particularly limited. If necessary, add a solvent such as water, methyl alcohol, acetone, cyclohexanone, styrene, etc. to polyimide resin, polysulfone, polybutadiene, fluorinated resin, polybutylene terephthalate, polyether ether ketone, etc. or a mixture thereof. ffs KaLt Tawanis, the base material is glass,
Inorganic fibers such as asbestos, polyester, polyamide,
A base material such as woven or non-woven fabric made of organic synthetic fibers such as polyvinyl alcohol and acrylic, or natural fibers such as cotton, paper, marito, etc. After immersing the base material in the solvent bath equipped with the ultrasonic generator, the base material may be immersed as it is or air-dried. Or after drying, the page is led to a varnish bath,
By impregnating the base material with the ζ varnish, it is possible to obtain a resin-impregnated base material in which the core of the base material is impregnated with resin.

Note that the conditions used for the drying, curing, winding, cutting, etc. of the base material impregnated with varnish may be those used in the production of ordinary resin-impregnated base materials and laminates.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 is a paper base material, and a solvent bottle 4 with an ultrasonic horn 3 containing water 2
The paper base material 1 is immersed in water to loosen the fibers of the paper base material and remove any air bubbles in the base material.Then, the air drying process is carried out to a varnish tank 7 containing a phenolic resin varnish 6. The base material 9 is impregnated with a phenol resin varnish 6, dried with a squeeze roll 8, adjusted and moved so that the amount of resin becomes 50% by weight, and a resin-impregnated base material 9 is obtained.

〔Effect of the invention〕

The present invention is constructed as described above. The method of impregnating a base material with varnish having the structure described in claim 1 has the effect that a resin-impregnated base material without bubbles can be obtained.

[Brief explanation of the drawing]

The drawing is a simplified cross-sectional view showing one embodiment of the method of the invention. 1 is a base material, 2 is water, 3 is an ultrasonic horn, 4 is a solvent bath, 5
6 is an air drying process, 6 is a varnish, 7 is a varnish bath, 8 is a squeeze roll, and 9 is a resin-impregnated base material.

Claims (1)

[Claims] (1) A method for impregnating a base material with varnish, which comprises immersing the base material in a solvent tank equipped with an ultrasonic generator, and then introducing the base material into a varnish tank to impregnate the base material with varnish.