JPH07171830A - Processor for glass-based prpreg and its processing method - Google Patents

Abstract

PURPOSE:To produce a laminate without a defect in physical properties by a method wherein resin powder of a glass based prepreg is continuously fixed at a temperature not higher than a melting point of the prepreg resin in combination with a vacuum drying process. CONSTITUTION:In a glass-based prepreg processor and its method, while a B-staged glass-based prepreg cut to a predetermined dimension is continuously fed, it is heated to a temperature not higher than a softening point of a prepreg resin in a short time by a far infrared ceramic heater for fixing the resin powder on the surface and the cut ends to the prepreg in combination with a vacuum drying process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a laminated board, a copper clad laminated board,
It is a method of treating a glass base prepreg cut into a predetermined size used for manufacturing a multilayer printed wiring board or the like. According to this treatment method, the resin powder generated by cutting can be fixed without substantially melting the prepreg resin, and since the prepreg resin is not melted, vacuum drying can be performed in parallel. Is something that can be done.

[0002]

BACKGROUND OF THE INVENTION Glass woven cloth and non-woven fabric based prepreg are
So-called B-stage by impregnating and attaching thermosetting resin
(Semi-cured state where it melts once when heated and then heat cured)
In most cases, it is used for manufacturing a laminated board, a copper clad laminated board, a multilayer printed wiring board, etc. after cutting it to a predetermined size. For cutting to a predetermined size, one or more B-stage long prepregs are cut with a rotary cutter or shear at room temperature. In the case of this method, the glass fiber base material on the cut surface is partially crushed and powdered, and the semi-cured resin on the end surface portion is also powdered over a distance of about 0.5 to 2 mm from the end surface. If the cut prepreg in this state is transferred as it is and used for combination of laminated materials, etc., the generated glass and resin powder will be scattered in the air, deteriorating the environment, and further falling to the place of the combination process of laminated materials. It becomes a foreign material such as a laminated plate. As a method for solving this drawback, after cutting, the end face is heated and melted at a temperature above the softening point of the resin and below the curing temperature with infrared rays, hot air, or a heating plate (Japanese Patent Laid-Open No. 63-158216) or There has been proposed a method (Japanese Patent Application Laid-Open No. 63-158217) in which a cut end surface is cut by heating it at a temperature above the softening point of the resin and below the curing temperature with infrared rays, hot air, or a heating plate. However, in the former case, heating up to the softening point (melting start temperature or melting point) or higher requires a relatively long time, and since the heating temperature is high, the characteristics of the prepreg in the heated portion may change or stickiness may occur. There is a problem of adhering to. Further, in the latter case, there is a drawback that the resin melted and softened at the time of cutting is apt to adhere to the cutting blade and the cutting becomes difficult unless the resin is removed. Further, both of them have a drawback that their curing characteristics are changed because the temperature of the prepreg resin is set to a softening point or higher.

On the other hand, the above-mentioned prepreg is usually in a state of being impregnated with a B-stage resin having a large amount of functional groups, so that it has a larger hygroscopicity than a cured resin. For this reason, there are four seasons like Japan, and particularly in the rainy season and hot and humid summers, it absorbs an extremely large amount of water, and the water tends to become prepreg accumulated on the functional groups and the surface of the base material. As a result, the laminated plate manufactured using the moisture-absorbed prepreg tends to be inferior in water resistance, chemical resistance, adhesion between the reinforcing material and the resin, etc., which is a cause of troubles in physical properties. As a solution to this problem, vacuum drying is conventionally performed, but it is usually a batch method, and it takes time to dry a large number of prepregs that are stacked in a large amount, and drying unevenness easily occurs. There was a flaw.

[0004]

DISCLOSURE OF THE INVENTION The present inventors diligently studied a method for preventing the generation of powder from a cut B-staged glass base prepreg and not changing the characteristics of the prepreg. As a result, it was found that the far-infrared ceramic heater heat-treated for a short time to a temperature below the softening point of the prepreg resin to fix the resin powder on the surface and the cut end to the prepreg and applied for a patent.
1-230364). Furthermore, as a result of further study, a method of continuously carrying out a large amount of this method, and further carrying out this method under reduced pressure to fix the powder of the prepreg,
They have found that the problem of poor physical properties of the laminate caused by moisture absorption and the like can be solved, and have completed the present invention.

[0005]

[Means for Solving the Problems] That is, the present invention is to continuously transfer a set of one or a plurality of B-staged glass base prepregs cut into a predetermined size while continuously transferring the set.
A device for fixing a resin powder on a surface and a cut end to a prepreg by heat-treating at a temperature up to a softening point of the prepreg resin for a short time, wherein a heat-treating part of the prepreg comprises:
A processing apparatus for a glass-based prepreg characterized by comprising a far-infrared ceramic heater section provided at least on the outside of a side surface thereof and a chain-shaped transfer section. Far-infrared ceramic heaters are further provided above and below the heat-treatment section. It is provided.

Further, the present invention is a powder fixing and depressurizing / continuous drying apparatus for glass-based prepregs, wherein the depressurizing chamber is provided with a depressurizing roll sealer having one set of rolls or two or more sets of rolls at the entrance and exit, respectively. In addition, a continuous conveying / drying section for B-staged glass base material prepreg is provided, and a far infrared ceramic heater heating section is provided at least at the inlet side or outlet side of the conveying section or in the middle of the pressure reducing roll sealer section. It is a processing device for a glass-based prepreg consisting of
The conveying path of the glass base material prepreg in the portion where the far infrared ceramic heater heating section is provided is a horizontal transfer system, and the conveying means is a chain or rope. Furthermore, the present invention is a set of one or a plurality of B-staged glass base material prepregs cut into a predetermined size,
A glass substrate characterized in that it is heat-treated under reduced pressure with a far-infrared ceramic heater to a temperature below the softening point of the prepreg resin for a short time to fix the resin powder on the surface and the cut end to the prepreg and to dry under reduced pressure. A method of treating a material prepreg, the temperature of the prepreg by the heating is 10 ° C or lower than the softening point of the prepreg resin, and the B-staged glass base prepreg is a set of a plurality of layers, Furthermore, it is a method of treating a glass base prepreg, which comprises fusing the ends of the prepreg together.

The structure of the present invention will be described below. Of the present invention
B-staged glass base prepreg is made of glass fiber used as a base material for the production of laminated boards, copper clad laminated boards, multilayer boards, etc., and is impregnated with glassy resin at room temperature. Alternatively, it is not particularly limited as long as it is attached. Here, woven fabrics and non-woven fabrics using various glass fibers such as E glass, S glass, D glass, and quartz glass as the glass substrate, and these glass fibers and other fibers such as alumina, cellulose, and wholly aromatic group are used. Polyamide, polyimide, fluororesin, polyphenylene sulfide, polyether ether ketone, woven fabric in combination with a substrate made of super heat-resistant resin such as polyether imide, usually contains a glass fiber such as non-woven fabric as an essential component Examples include base materials.

The thermosetting resin to be impregnated into the base material is a phenol resin; a polyester resin; a bisphenol A type, a novolac type, a halogenated bisphenol A type, a halogenated novolac type, and other polyfunctional compounds having three or more functional groups. Epoxy resin such as epoxy compound; cyanate resin, cyanate ester-epoxy resin, cyanate ester-maleimide-epoxy resin and other cyanate ester resin; polyfunctional maleimides such as bismaleimide and bis (4- Examples include maleimide-based resins containing a polyfunctional amine such as aminophenyl) methane as a main component; and mixtures of two or more of the above thermosetting resins.

The prepreg of the present invention is prepared by cutting the B-staged ordinarily long resin-impregnated glass cloth base material prepreg, usually by laminating one or more sheets with a rotary cutter or a shear under normal temperature or heating. It was done. The glass fiber base material at the cut end of the cut prepreg is crushed and powdered, and the semi-cured resin at the end face is 0.5 to 2 from the end face.
The powder is whitened or powdered over a distance of about mm, and the generated powder is partially scattered and adhered to the other surface of the prepreg.

According to the present invention, a set obtained by combining one sheet of the above-mentioned prepreg or a plurality of sheets for a laminated plate is used for drying under reduced pressure and fixing the powder.

First, for powder fixing, a far-infrared ceramic heater is used under reduced pressure, and the prepreg surface resin is heated for a short time to a temperature below the melting and softening temperature to selectively generate the above-mentioned powder. By melting and fixing to the prepreg surface. The heating by the far infrared ceramic heater is not particularly limited as long as it is within the above range, but normally, the distance between the heater surface and the prepreg surface is 1 to 20 cm, the heater surface temperature is 200 to 600 ° C, and the treatment time is 3 to 120 seconds. Select appropriately. For example, in the case of melting only the end of the prepreg, the temperature of at least the end of the far infrared ceramic heater can be controlled independently,
By setting the surface temperature higher than that of the inside, the resin powder on the other surface can be fixed, and at the same time, a large amount of powder at the end can be rapidly melted and fixed.

The far-infrared ceramic heater used in the present invention is a heater using a far-infrared radiator having a wavelength of 5 to 30 μm, and emits far-infrared light which is uniform over almost the entire wavelength range. Anything is fine. In this wavelength range,
There are absorption spectra for prepreg impregnated resins such as epoxy resin. As a result, far infrared energy is efficiently absorbed by the resin, and of course the entire prepreg is melted, especially before the surface temperature reaches the softening point of the prepreg resin. Then
It can be fixed on the prepreg surface. Further, even when the prepreg with the powder fixed thereon is immediately overlaid, the surface of the prepreg is not softened and the prepreg is cooled immediately so that the prepregs do not fuse with each other. Further, far infrared rays easily pass through the end surface of the powdered prepreg. Therefore, even when the prepregs are stacked and processed, the powder inside can be melted and fixed. Further, since the surroundings are hardly heated, the surface of the prepreg is of course lowered when the power source of the heater is turned off, and the surface temperature of the heater is easily lowered in a short time, so that its management is also easy.

As the heating means, there are ordinary infrared lamps and hot air. In the infrared lamps, the radiation wavelength range is 1 to 10 μm, most of which is in the range of 5 μm or less, and only the resin powder is heated. The efficiency is significantly inferior. As a result,
It becomes difficult to heat, melt and fix the resin powder only in a short time.
The surface and surroundings of the prepreg are also heated above the softening point, the temperature of the prepreg itself rises above the softening point, and it takes time to cool. Further, with hot air, uniform heating is difficult and scattering of the resin powder occurs, which is not suitable for fixing the resin powder to the prepreg.

The heating in reduced pressure drying is not particularly required, but it is preferably used in order to obtain a prepreg having a desired moisture absorption amount in a shorter time, and since it is a reduced pressure, ordinary radiation heating or the like is performed. Is preferred. As described above, the heating temperature is not higher than the softening point of the prepreg resin, preferably not higher than 10 ° C. lower than the softening point. In the case of the present invention, the reduced-pressure drying time is one or a maximum of about eight laps of the prepreg, so that the desired moisture absorption can be achieved very quickly, and it usually depends on the degree of reduced pressure. ~ 30
It may be in the range of minutes, preferably in the range of 3-10 minutes.

Next, an example of the concept of the device of the present invention for carrying out the present invention will be described with reference to the drawings. In FIG. 1, powder is fixed by a continuous method.

[Figure 1]

In FIG. 1, PP, which is cut or combined into a predetermined size, is loaded into a loading table (1) composed of a belt type transfer tool. The PP moves from left to right, moves from the charging roll (2) to the transfer chain (4), and is moved by the far infrared heater (3) to fix the powder.
It is taken out to the take-out stand (6) through the take-out part roll (5). Here, far infrared heaters are provided on both outer side surfaces in the PP moving direction so that only the powder near the sides in the PP moving direction is fixed, or by providing it on the upper and lower surfaces as well. Can also be fixed. If there is a large amount of powder in the vicinity of the side perpendicular to the moving direction, perform the above processing by rotating the input PP by 90 degrees, or use a similar device to the unloading stand (6). It is efficient to install it vertically.

FIG. 2 shows an apparatus for performing vacuum drying and powder fixing applicable to thin PP, and FIG. 3 shows a plan view of the apparatus shown in FIG.

[Fig. 2]

In FIG. 2, PP is a vacuum roll unit for charging.
It is put between the rolls of (1), transferred from left to right while being vacuum-sealed, and then placed on the elevator PP transfer table (21) through the rolls at the inlet of the reduced pressure drying section (2). . Transfer stand
(21) moves upward along the transfer table guide (22) by a chain method, a screw method, etc., and reaches the horizontal transfer tool (23) at the upper part, where the horizontal transfer tool (23) moves to the right. It is sent to the descending section. It descends as it is, rides on the moving belt, is transferred to the right, and is taken out via the roll of the vacuum roll unit (3) for taking out. The transfer table (21), which has moved the PP further downward from the transfer belt, is moved from the right to the left by the horizontal transfer tool at the bottom and re-rotated. Here, the powder is fixed in the vicinity of the side parallel to the moving direction by providing far infrared heaters on both outer surfaces of the charging vacuum roll part (1) or the taking out vacuum roll part (3), and also the moving direction. The vicinity of the side perpendicular to the above can be easily performed by providing far-infrared heaters on both sides of the elevating part near the PP receiving or extracting part of the elevating type PP transfer table (21).

[0019]

[Figure 3] Further, FIG. 3 is a plan layout view centering on the loading and unloading section of FIG. 2, and PP is a loading vacuum roll section (1).
It is transferred to the elevating type PP transfer table (21), moved up and down to be dried, taken out through the take-out vacuum roll section (3), and dried and fixed with powder.

[0020]

The present invention will be specifically described below. Example 1 Plain weave E glass woven fabric substrate (width 1040 mm, thickness 0.2 mm, weight
A continuous glass substrate epoxy prepreg (hereinafter referred to as PP) having a thickness of 0.19 mm and having 205 g / m ² ) as a substrate was cut with a rotary cutter at the point of leaving the PP drying and heating zone. 50% by weight of PP resin, gelling time at 170 ℃ 90
Second, the resin flowability at 170 ° C was 35% by weight, the softening point (melting start temperature) was 80 ° C, and powder was formed up to about 1 mm from the cut end. This PP was heat-treated using a far infrared ceramic heater to fix the powder on both side surfaces and the end of the PP to the PP.
The processing conditions were as follows.・ Heating device; A device that uses the rapid heating far-infrared heater, QUT-40, manufactured by Teikoku Piston Ring Co., Ltd., arranges 11 upper and lower parts with a vertical distance of 120 mm, and passes PP in the middle. ・ Heater surface temperature : Upper and lower surface heater 310 ℃, end surface heater 430 ℃. ・ Space between PP and heater: Upper and lower surface 60mm, end surface 40
mm ・ PP passing speed: 13 m / min. ・ PP heating time: 3 seconds ・ PP surface temperature: 70 ° C. The resin powder on the treated PP surface and the resin powder on the edges are all completely It was fixed. The gelling time, resin flowability, and softening point (melting start temperature) of this PP were the same as before treatment.

Example 2 In Example 1, a continuous glass epoxy prepreg having a thickness of 0.11 mm was continuously cut into predetermined dimensions, and the upper and lower heater surface temperatures were 270 ° C. and the end surface heater surface temperatures were 400 ° C. The same procedure was followed except that the cut end was on the heater side of the end face, and PP was passed through.
As a result, the PP surface temperature at the end was 75 ° C. The resin powder on the surface that passed through other than the end of the treated PP was completely fixed on the PP surface and passed through the end of the heater.
The PP edge was melted and fused over a width of 5 mm. The gelation time, resin flowability and softening point of this PP were the same as before treatment.

Example 3 In Example 1, the pressure reduction degree (30 mmHg), temperature (70 ° C.),
The same operation was carried out except that a far-infrared heater was set between the depressurizing rolls at the outlet part, together with the time (15 minutes) vacuum drying. The treated PP had a weight loss of 0.015% and the resin powder on the surface and the end face was completely fixed. Also, as a result of manufacturing a laminated board using this PP,
The heat resistance against moisture absorption was 960 Hrs or more at 40 ° C and 90% RH.
This was a significant improvement compared to the occurrence of blisters at 240 Hrs without this treatment.

[0023]

As described above, according to the continuous method of the prepreg treatment in which the far-infrared ceramic heater of the present invention is heated to a temperature below the softening point of the prepreg resin for a short time, the characteristics of the prepreg are described. The work environment can be greatly improved by eliminating the dust generated by the resin powder generated by cutting without changing the temperature. Moreover, it is a short-time treatment, and the treatment method of the present invention can be applied without disturbing the existing manufacturing process. Further, performing this continuous treatment method simultaneously with or in combination with reduced-pressure drying is described in the present invention. It can be carried out easily, and the drying time can be shortened, and its industrial significance is extremely high.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technology display location // B29K 105: 08 B29L 9:00 (72) Inventor Norio Sayama 2-5-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Gas Chemical Co., Ltd.

Claims (7)

[Claims] 1. A set of one or a plurality of B-staged glass base prepregs cut into a predetermined size are continuously transferred, and the temperature is kept at a temperature below the softening point of the prepreg resin for a short time. An apparatus for fixing resin powder on the surface and cut ends to a prepreg by heat treatment, wherein the heat treatment section of the prepreg comprises a transfer section by a chain-like object and a far infrared ceramic heater section provided at least outside the side surface thereof. Glass-based prepreg processing apparatus characterized by 2. The apparatus for treating a glass substrate prepreg according to claim 1, further comprising far-infrared ceramic heaters provided above and below the heat treatment section. 3. A powder-fixing and pressure-reducing / continuous-drying device for a glass-based prepreg, wherein a decompression chamber having a decompression roll sealer consisting of one set of rolls or two or more rolls at the entrance and exit, stage A glass substrate that is provided with a continuous conveying / drying unit for a prepreg made of a glass material, and a far infrared ceramic heater heating unit is provided at least on the inlet side or the outlet side of the conveying unit or in the middle of the pressure reducing roll sealer unit. Processing equipment for wood prepreg 4. The glass base material prepreg according to claim 3, wherein a transport path of the glass base material prepreg in the portion provided with the far infrared ceramic heater heating portion is a horizontal transfer system, and the transport means is a chain or a rope. Processing equipment 5. A set in which one or a plurality of B-staged glass base material prepregs cut into a predetermined size are stacked,
A glass substrate characterized in that it is heat-treated under reduced pressure with a far-infrared ceramic heater to a temperature below the softening point of the prepreg resin for a short time to fix the resin powder on the surface and the cut end to the prepreg and to dry under reduced pressure. Processing method of wood prepreg 6. The method for treating a glass-based prepreg according to claim 5, wherein the temperature of the prepreg by the heating is 10 ° C. or lower than the softening point of the prepreg resin. 7. The method for treating a glass-based prepreg according to claim 5, wherein the B-staged glass-based prepreg is a set in which a plurality of prepregs are stacked, and the ends of the prepreg are fused together.