JPH04163364A - Production of glass fiber fabric - Google Patents

Abstract

PURPOSE:To improve the varnish-impregnating property and soldering heat resistance of a glass fiber fabric by blasting compressed air on the glass fiber fabric to open wefts and warps composing the fabric. CONSTITUTION:A glass fiber fabric formed of glass fibers as both warps and wefts is subjected to a thermal de-oiling treatment and further to an epoxy silane treatment. The surface of the treated fabric is uniformly blasted with a dust-removed air or inert gas such as nitrogen gas from small aperture nozzles arranged at equal distances in the width direction of the fabric in a blasting pressure of 0.5-30kg/cm<2> to open the warps and wefts composing the web.

Description

Detailed Description of the Invention <Industrial Application Field> The present application relates to a method for manufacturing glass fiber cloth used as a reinforcing material for textile reinforced plastics, and in particular to a method for manufacturing glass fiber cloth used as a base material for printed wiring boards. Regarding the manufacturing method.

<Conventional technology> Conventionally, printed wiring boards are copper-clad laminates obtained by laminating glass fiber cloth with prepreg impregnated with thermosetting resin such as epoxy or polyimide, overlaying copper foil on the surface layer, and heating and pressing. It is made by processing.

In recent years, as electronic devices have become smaller and more highly packaged, the characteristics required of printed wiring boards have also become more sophisticated. In particular, there is an increasing demand for improvements in heat resistance, dimensional stability, etc.

In order to meet this requirement, glass fiber cloth is treated with various silane coupling agents to chemically improve the adhesive properties between glass fiber cloth and thermosetting resin. Efforts are being made to increase the

In addition, various physical treatments have been proposed to further enhance the treatment effects of this silane coupling agent. For example, there are methods such as nipping the glass fiber cloth between rollers, bringing an ultrasonic oscillator into contact with the moving glass fiber cloth, and spraying high-pressure liquid onto the surface of the glass fiber cloth.

All of these methods aim to achieve a synergistic effect with the chemical effect of the silane coupling agent by opening the constituent yarns of the glass fiber cloth and improving their impregnability with the resin.

<Problems to be Solved by the Invention> Among the various physical methods described above, the method of injecting high-pressure liquid onto the surface of glass fiber cloth is currently in practical use because its opening effect is poor. However, the method of spraying high-pressure liquid results in the glass fiber cloth being wetted by the liquid.

Therefore, when the liquid is water, it is necessary to dry the water, and when the liquid is an organic solvent, it is necessary to recover the solvent at the same time as drying.

Further, the fiber opening treatment for the glass fiber cloth is usually carried out after the glass fiber cloth is woven, subjected to an oil removal treatment, and further subjected to a surface treatment. For this reason, the treatment agent deposited during the surface treatment process is sprayed with high-pressure liquid.
There was a problem that part of it came off.

<Means to Solve the Problem> The inventors of the present application have found that it is possible to solve the above problem by injecting compressed gas into a glass fiber cloth and opening the warp and weft yarns that constitute the glass fiber cloth. I found out.

Effects> The present invention is a method for producing glass fiber cloth, which is characterized by injecting compressed gas onto the glass fiber cloth.

The compressed gas used in this application is preferably dust-removed air or nitrogen gas, which is an inert gas, and the injection pressure thereof is selected from 0.5 to 30 kg/cm2. If this injection pressure is small, the opening of the glass fiber cloth will be insufficient and the effect will not be exhibited. On the other hand, if the pressure is too high, local fiber disturbances of the fiber cloth may occur, which is not preferable.

The air or inert gas can be injected by arranging small-diameter nozzles at equal intervals in 11 directions of the fiber cloth and eccentrically rotating them around an axis for uniformity. The diameter of the nozzle is preferably about 1 to 3 mm.

Alternatively, it is also possible to use a slit-shaped injection port in place of the nozzle, and this can be selected as appropriate depending on the required quality.

Since the method of the present invention uses compressed gas instead of high-pressure liquid, the object to be treated is not wetted with liquid, and therefore a drying step is not necessary. In addition, in the case of a liquid, since the mass of the liquid itself is large, a phenomenon was observed in which a part of the silane force/7 pulling agent that was already attached was peeled off by jetting the high-pressure liquid, but in the case of the present application. No such phenomenon occurs.

The glass fiber cloth used in the present invention is not limited in its constituent glass composition, and any fiber diameter can be used as long as it can be woven.

The weave and IN weave may be any type of weave, such as plain weave, twill weave, and satin weave. Further, a fiber cloth made of fibers other than glass fibers, such as a mixed fiber cloth made of glass fibers and carbon fibers, etc., may be used, and is not affected by moisture absorption, swelling, etc. due to water or organic solvents.

<Example>ECG75'/ as warp and weft. Glass fiber cloth [Nitto Boseki ■Product name: WEA18W] woven with a warp density of 44 threads/25 mm and a weft density of 33 threads/25 mm using
was heated to remove oil and then treated with epoxy silane.

The above-mentioned treated glass fiber cloth was subjected to fiber opening treatment under various conditions shown in Table 1.

In the spraying method of Example 1.2, a slit nozzle with a slit in the width direction of the cloth was used. Nozzle width is 1.0
mm, and the distance between the nozzle surface and the glass fiber cloth was 50 mm.

In addition, in the injection method of Comparative Example 1.2, nozzles with a diameter of 0.1 mm were arranged at equal intervals, and high-pressure liquid was injected while rotating eccentrically with respect to the axis.

Table 1 Table 2 shows the varnish impregnation properties of the various opened glass fiber cloths obtained and the properties of the substrates made from them.

Comparative Example 3 in Table 2 is data for a glass fiber cloth that was not subjected to opening treatment.

Table 2 The test was conducted under the following conditions, which are not shown in Table 2.

■ Epoxy varnish composition Epicor 1-1001 (manufactured by Yuka Shell Co., Ltd.) 100 parts by weight Epicort 1.54 () 20 Dicyandiamide 4.0 Hensyl dimethylamine 0.2 ■ Glass fiber impregnated with varnish into glass fiber cloth The ability to impregnate cloth with varnish is as follows: The varnish has a viscosity of 1.
A glass fiber cloth was floated on the varnish using a 50 centimeter void, and the time until there were no air bubbles on the glass fiber cloth was measured.

■　Prepreg creation conditions '' Two pairs of shoes were impregnated with varnish to create prepreg.

At that time, the resin content was adjusted to 42%, and the drying conditions were 15%.
The temperature was 0°C for 3 minutes.

■ Laminate preparation conditions and PCT soldering Soldering heat resistance 8 prepreg sheets were stacked, 18 μm thick copper foil was laminated on both sides, pressed at 130 kg/cm2, and cured at 1.
A copper-clad laminate was prepared by heating under pressure at 70° C. and curing time of 90 minutes. Next, the laminate was humidified using a pressure cooker, and then immersed in a 260° C. solder bath for 5 seconds to check for interfacial peeling of the laminate.

<Effects of the Invention> The glass fiber cloth according to the present invention provides similar effects in terms of varnish impregnability and solder heat resistance of laminates, compared to glass fiber cloths opened by other methods. Furthermore, the fiber opening method of the present application has the advantage that drying and solvent recovery after the fiber opening process are not required.

Claims (1)

[Claims] A method for producing a glass fiber cloth, which comprises opening warp and weft yarns constituting the glass fiber cloth by injecting compressed gas onto the glass fiber cloth.