JP4140106B2 - Glass fiber fabric and laminated board using the same as reinforcing material - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a laminated board for a printed wiring board used in the electronic / electric field, and a glass fiber fabric used for a reinforcing material thereof.
[0002]
[Prior art]
Laminates for printed wiring boards used in telecommunications equipment, industrial equipment, electronic equipment, etc. require characteristics such as dimensional stability, mechanical strength, electrical insulation, heat resistance, chemical resistance, etc. A glass fiber fabric is generally used as a reinforcing material. However, with the recent increase in the density and the number of layers of printed wiring boards, the requirements for characteristics of laminated boards have become stricter. For glass fiber fabrics, characteristics such as the prevention of yarn breakage and fluffing and resin impregnation properties. There is a growing demand.
[0003]
The woven structure of the glass fiber fabric used for the laminated board for printed wiring boards is usually a plain weave. The plain weave structure is the most woven structure where warps and wefts float and sink, and is a structure in which the glass fiber and the resin are not easily in contact with each other. Therefore, improvement of the resin impregnation property is particularly limited. For this reason, various approaches have been taken from the woven structure in response to the characteristic requirements for the glass fiber fabric.
[0004]
For example, in order to improve dimensional stability, JP-A-63-318196 discloses a glass fiber fabric having an oblique weave structure. In order to prevent warping and twisting, Japanese Patent Application Laid-Open No. 7-52317 discloses a glass fiber woven fabric having a weave structure composed of one warp and two or more wefts. However, although these are effective in terms of resin impregnation, a plurality of wefts are driven while the warp is opened, so the degree of freedom of the wefts increases, the wefts loosen, and the yarn breaks due to friction between the wefts. More fluffing may occur than with plain weave glass fiber fabrics. Further, in order to improve the resin impregnation property, JP-A-8-18180 discloses a glass fiber fabric having an oblique weave texture or a weave weave texture. This is not the case when the weft is a single warp weave, but the shape of the contact surface between the warp yarn of the “floating” portion and the weft yarn of the “sink” portion in the weave structure diagram is It becomes a rectangle about twice or more in the short direction, and heat resistance may not be improved. This is because the weaving / shrinkage ratio due to weaving produces a large difference between the warp and the weft, and the laminate made of this glass fiber fabric as a reinforcing material has a large difference in stress strain between the warp and the weft in response to thermal expansion. This is probably because the expected effect on thermal shock may not be achieved.
[0005]
[Problems to be solved by the invention]
The present invention provides a woven structure of a glass fiber woven fabric that is less likely to cause yarn breakage and fluffing in the weaving process and has excellent resin impregnation properties, and further laminated and molded with the glass fiber woven fabric as a reinforcing material. It is providing the laminated board which has the outstanding heat resistance suitable for.
[0006]
[Means for Solving the Problems]
In order to achieve the object of the present invention, it is preferable to weave the woven structure of the glass fiber fabric in the following manner. That is,
(A) In order to obtain a glass fiber woven fabric with little yarn breakage and fluffing, weaving is performed with a weave structure in which wefts are bundled one by one by warp, thereby preventing friction between flying wefts.
(B) In order to obtain a glass fiber fabric having excellent resin impregnation properties, weaving is performed with a woven structure in which there are few places where warp and weft float and sink in the woven structure diagram to facilitate contact between the glass fiber and the resin.
[0007]
The woven structure of (a) is typified by a plain woven structure, and the woven structure of (b) is typified by a satin weave structure or a twilled structure, but printed wiring other than the problem of the present invention is based on the above-mentioned weaving procedure. The present invention has been completed in consideration of the woven structure of the glass fiber fabric that satisfies the required dimensional stability, mechanical strength, and surface smoothness of the laminated board, which are required characteristics for the laminated board.
[0008]
That is, the weave structure of the glass fiber fabric in the present invention is a warp weave structure in which two or more and four or less warp yarns float and sink simultaneously with respect to one weft. A warp weave structure in which five or more warps are lifted and lowered simultaneously may be difficult to maintain.
[0009]
Furthermore, in a glass fiber fabric woven in a plain weave structure using the same count warp and weft, (weft weave density) / (warp weave density) is close to 0.8, and the weft shrinkage of warp and weft is almost It is known to be equal. In the glass fiber fabric of the present invention, in order to make the weft shrinkage ratio of warp and weft nearly equal, the weave density of weft and warp is (number of warps that float and sink simultaneously on one weft) x (weave density of weft) / (Weaving density of the warp) is 0.6 to 1.1, and the count of the warp and the weft is (number of warps that float and sink at the same time for one weft) x (the count of the warp) / (the count of the weft) ) Is 0.9 to 1.1 .
[0010]
Moreover, the laminated board in the present invention is characterized by using at least one glass fiber fabric, and is suitable for a printed wiring board.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the filament which comprises the thread | yarn used for the glass fiber fabric of this invention, the shape, thickness, and material are not specifically limited.
[0012]
The yarn count used in the glass fiber fabric of the present invention according to B method of JIS R 3420 5.1.2 is preferably 20 to 80 tex for warp and 40 to 140 tex for weft. When the warp count is 20 tex or the weft count is less than 40 tex, the effect of the present invention may be reduced, and when the warp count is 80 tex or the weft count is greater than 140 tex, the lamination using the glass fiber fabric Problems may arise in the surface smoothness of the plate. (Hereinafter, the count of the glass fiber is described by the value by the above method.)
[0013]
The weaving density of the yarn used in the glass fiber fabric of the present invention is desirably 13 warps / 25 mm to 80/25 mm and 13 wefts / 25 mm to 45/25 mm. More preferably, the warp is 25/25 mm to 60/25 mm, and the weft is 13/25 mm to 30/25 mm. When the weaving density of the warp is 13/25 mm or the weaving density of the weft is less than 13/25 mm, it may be difficult to maintain the woven structure, and the weaving density of the warp is 60/25 mm, or When the weaving density is greater than 45 pieces / 25 mm, the resin impregnation property may be lowered.
[0014]
The number of twists of the warp and weft used in the glass fiber fabric of the present invention is preferably 0.3 times / 25 mm to 2.0 times / 25 mm in order to achieve the object of the present invention. When the number of twists is less than 0.3 times / 25 mm, the converging property of the glass fiber is lowered, and yarn breakage and fluffing are likely to occur. The resin impregnation property may decrease. The twist direction of the warp and weft used in the glass fiber fabric of the present invention may be either S twist or Z twist, and S twist and Z twist warps (or wefts) may be alternately arranged.
[0015]
Moreover, this invention is not restrict | limited to the physical or chemical process in the process from extending | stretching of molten glass to resin impregnation of a glass fiber fabric. As the physical or chemical treatment, coating treatment with a sizing agent immediately after stretching of the molten glass, bulky processing for making the glass fiber bulky with an air jet, etc., coating treatment for warp with a secondary sizing agent during weaving, glass fiber fabric And a surface treatment with a silane coupling agent performed thereafter, a fiber opening treatment in which a glass fiber fabric is treated with a pressure wave of a fluid, and the like.
[0016]
As the matrix resin used in the laminate of the present invention, a thermosetting resin conventionally used in the production of laminates using a glass fiber fabric as a reinforcing material can be used. For example, epoxy resin, polyimide resin, phenol resin, polyester resin, Silicone resin, polyurethane resin, polyvinyl butyral resin, etc. can be used.
[0017]
The laminate of the present invention may be laminated by a conventional method, and the use of the glass fiber fabric of the present invention for the surface side layer of the laminate is effective for achieving the object of the present invention, but is limited to this. It is not a thing.
[0018]
【Example】
Glass fibers coated with a sizing agent were used as warps, and the glass fibers were further coated with a secondary sizing agent to obtain wefts.
[Example 1]
(1) Creation of glass fiber fabric Using an air jet weaving machine, ECG75 1/0 (count 66 tex) is used for warp, ECG37 1/0 (count 132 tex) is used for weft, 44 warps / 25 cm, A glass fiber woven fabric of Example 1 having a warp weave structure in which two warp yarns float and sink simultaneously with one weft yarn at a weaving density of 16 weft yarns / 25 cm was obtained. This weave organization chart is shown in FIG.
[0019]
(2) Preparation of Laminate After the glass fiber fabric obtained in (1) was thermally deoiled, it was surface-treated with an acetic acid aqueous solution of γ-methacryloxypropyltrimethoxysilane. Two sheets of this surface-treated glass fiber fabric are stacked, a glass paper (EPM-4050 manufactured by Nippon Vileen Co., Ltd.) is sandwiched between them, impregnated with a resin varnish having the following composition, and copper foil is stacked on both surface layers. Deaerated for 1 minute, heated at 150 ° C. for 1 hour to obtain a copper clad laminate, and the copper foil was removed by etching to obtain a laminate of Example 1.
[0020]
<Resin varnish formulation>
Unsaturated polyester resin 100 parts by weight Styrene monomer 40 parts by weight Cumene hydroperoxide 1 part by weight
[Example 2]
Using an air jet weaving machine, ECE225 1/0 (count 22 tex) is used for the warp, ECG75 1/0 (count 66 tex) is used for the weft, and the weaving density is 132/25 cm for the warp and 32/25 for the weft. Thus, a glass fiber fabric of Example 2 having a warp weave structure in which three warp yarns float and sink simultaneously with respect to one weft yarn was obtained. Moreover, the laminated board of Example 2 was obtained by the method similar to (2) of Example 1. A woven structure diagram of the glass fiber fabric of Example 2 is shown in FIG.
[0022]
[ Reference Example 1 ]
Using an air jet weaving machine, ECG75 1/0 (count 66 tex) is used for warp and weft, and weaving density is 44 warps / 25 cm and weft 32/25 cm. A glass fiber fabric of Reference Example 1 having a knot weave structure in which warp yarns float and sink simultaneously was obtained. Moreover, the laminated board of the reference example 1 was obtained by the method similar to (2) of Example 1. FIG. A woven structure diagram of the glass fiber fabric of Reference Example 1 is shown in FIG.
[0023]
[Comparative Example 1]
Using the air jet weaving machine, ECG37 1/0 (counter 132 tex) is used for the warp yarn and ECG75 1/0 (counter 66 tex) is used for the weft yarn. Thus, a glass fiber woven fabric of Comparative Example 1 having a weaving density of 16 warps / 25 cm and a weft density of 44 wefts / 25 cm, in which two wefts float and sink simultaneously with respect to one warp, was obtained. Moreover, the laminated board of the comparative example 1 was obtained by the method similar to (2) of Example 1. FIG. The weave structure diagram of Comparative Example 1 is shown in FIG.
[0024]
[Comparative Example 2]
Using an air jet weaving machine, ECG75 1/0 (count 66 tex) is used for warp and weft, and the weft density is 44 warps / 25 cm and 32 wefts / 25 cm. A glass fiber fabric of Comparative Example 2 having a weave texture was obtained. Moreover, the laminated board of the comparative example 2 was obtained by the method similar to (2) of Example 1. FIG. A woven structure diagram of the glass fiber fabric of Comparative Example 2 is shown in FIG.
[0025]
[Comparative Example 3]
Using an air jet weaving machine, ECG75 1/0 (count 66 tex) is used for the warp and weft, and the weave density is 44 warps / 25cm and 32 wefts / 25cm. A glass fiber fabric of Comparative Example 3 having a structure was obtained. Moreover, the laminated board of the comparative example 3 was obtained by the method similar to (2) of Example 1. FIG. A woven structure diagram of the glass fiber fabric of Comparative Example 3 is shown in FIG.
[0026]
[Evaluation]
(A) Evaluation of glass fiber fluff The glass fiber fabrics of the examples and comparative examples were evaluated for the number of fluff occurrence per unit length of glass fiber and the state of fluff in four stages.
[0027]
(B) Evaluation of resin impregnation property of glass fiber fabric In each example and comparative example (2), the defoaming state after impregnating the glass fiber fabric with the resin varnish was observed and evaluated in four stages.
[0028]
(C) Evaluation of heat resistance of laminated board About the laminated board of each Example and a comparative example, the soldering iron of diameter 2mm heated at 300 degreeC was applied for 10 second each, applying 100g load, and generation | occurrence | production of the occurrence of measling The state was examined and evaluated in four stages.
[0029]
In the above evaluation, the evaluation criteria are as follows, and the evaluation results are shown in Table 1.
Rank 1: Defects do not occur.
Rank 2: Although some troubles occurred, judging from the number of occurrences and the degree of occurrence, there was no problem in terms of quality as a laminated board for printed wiring boards.
Rank 3: There is a problem and there is no quality problem as a laminated board for printed wiring boards, but further improvement is desired.
Rank 4: Problems occur, and there are some problems in quality as a laminated board for printed wiring boards.
[0030]
[Table 1]
Evaluation results
[0031]
【The invention's effect】
The glass fiber fabric of the present invention has an excellent resin impregnation property, and a laminated board using the glass fiber fabric as a reinforcing material is improved in heat resistance due to the particularly excellent resin impregnation property, and is suitable for a printed wiring board.
In addition, the glass fiber woven fabric with a woven structure in the present invention can be woven using a normal weaving machine for plain weaving, and the productivity is almost the same as that of weaving with a plain weaving structure.
[Brief description of the drawings]
FIG. 1 is a woven structure diagram of a two warp woven structure (Example 1).
Fig. 2 Weaving structure diagram of three warp weaving structures (Example 2)
Fig. 3 Weaving structure diagram of two warp weaving structures (Example 3)
FIG. 4 is a weave structure diagram of a two weft weave structure (Comparative Example 1).
FIG. 5 shows a weave structure diagram of a 2/2 diagonal weave structure (Comparative Example 2).
FIG. 6 is a weave structure diagram of a plain weave structure (Comparative Example 3). In all of FIGS. 1 to 6, the black-painted portion indicates the portion where the warp is “floating”, and the white portion indicates the portion where the warp is “sink”. Show.

Claims (2)

A warp weaving structure in which two or more and four or less warps float and sink simultaneously for one weft , (number of warps simultaneously sinking for one weft) x (weave density of weft) / (warp Woven density) is 0.6 or more and 1.1 or less , and (the number of warp yarns that float and sink simultaneously with respect to one weft) × (warp yarn count) / (weft yarn count) is 0.9 or more and 1 Glass fiber fabric that is less than or equal to 1. A laminate for a printed wiring board obtained by laminating at least one sheet of the glass fiber fabric according to claim 1 .