JP4458987B2 - Method for producing flat glass fiber fabric - Google Patents

Description

  The present invention relates to a method for producing a flat glass fiber fabric by opening the glass fiber fabric.

  Glass fiber fabric is widely used as a substrate for resin reinforcement, and in recent years, it is highly used as a reinforcing material for laminates for printed wiring boards. A laminated board using a glass fiber fabric as a reinforcing material is usually produced by impregnating a glass fiber fabric with a thermosetting resin and heating and curing it.

  Glass fiber fabric used as a reinforcing material for laminates for printed wiring boards requires mechanical strength, dimensional stability and heat resistance, and also has good resin impregnation properties and excellent surface smoothness. It is required that In order to improve the surface smoothness and resin impregnation property of such a glass fiber fabric, it is known to open the glass fiber fabric (Patent Document 1).

Patent Document 1 describes a method of opening a glass fiber fabric by spraying a high-pressure water jet onto the glass fiber fabric. However, it requires a large amount of water, requires a high-pressure pump and water treatment, and has a problem that the facility becomes large-scale.
Patent Document 2 describes a method of opening a glass fiber fabric using ultrasonic waves. Patent Document 3 describes a method of opening a glass fiber fabric by spraying a liquid flow containing bubbles on the glass fiber fabric. Patent Document 4 describes a method of opening a glass fiber fabric by heat-treating glass fibers containing moisture with a cylinder dryer. However, none of them is necessarily satisfactory in processing speed and productivity, and a better fiber opening method has been desired.
JP-A-61-194252 JP-A 63-165441 JP 2002-4165 A JP 2003-89967 A

  An object of this invention is to provide the manufacturing method of an industrially advantageous flat glass fiber fabric which overcomes the difficulty which a conventional method has.

As a result of diligent research on a method for producing a flat glass fiber fabric from a glass fiber fabric, the inventors of the present invention have been able to solve the above-mentioned conventional problems at once by spraying water on the glass fiber fabric containing water to open it. I found that it can be solved.
In addition, after obtaining the above findings, the present inventors have further studied and completed the present invention.

That is, the present invention
[1] Production how the flat glass fiber fabric, which comprises opening by injecting water vapor in the air on the water glass fiber fabric is a moisture content 40 to 80%
[ 2 ] The production method according to the above [1], wherein the spray pressure of water vapor is 0.1 to 1 MPa.
[ 3 ] The production method according to [1] , comprising a water treatment for containing the glass fiber fabric and a water treatment for spraying the water-containing glass fiber fabric to open the fiber.
[4] the and performing the water treatment and the steam treatment at the same time [3] Production how according, and [5] The glass fiber woven fabric to water treatment, and then injecting steam into the glass fiber woven fabric and water characterized by opening in [3] production how according,
About.

The production method of the present invention has the following effects (A) to (D), and can produce a flat glass fiber woven fabric with excellent industrial quality.
(A) The processing speed is fast and the productivity is excellent.
(B) Since the water jet can use a low pressure at which water cannot be sprayed uniformly, the glass fiber fabric can be opened without causing roughening of the glass fiber fabric (with no displacement of the constituent filaments) and without affecting the appearance and function. I can be fine.
(C) Compared to the case of using a water jet, a large amount of water is not required, a high-pressure pump and water treatment are unnecessary, and it can be carried out even with a small-scale facility.
(D) It can implement suitably also with a thin glass fiber fabric.

  The method for producing a flat glass fiber woven fabric according to the present invention is characterized by spraying water into a glass fiber woven fabric containing water to open the fiber.

[material]
The glass fiber fabric used as a raw material in the present invention is not particularly limited as long as it is an unopened glass fiber fabric, and may be a known one. In the present invention, a thin glass fiber woven fabric is also preferably used. For example, a glass fiber woven fabric having a thickness of 100 μm or less (preferably 60 μm or less) is preferably used.

The glass fiber fabric is manufactured by weaving glass fibers.
The glass fiber may be a known glass fiber, and the type, fiber diameter, count, etc. are not particularly limited. However, when the kind of glass fiber is dared to be exemplified, one type or two or more types selected from E glass, silica glass, D glass, S glass, T glass, C glass, H glass and the like may be mentioned. Among these, E glass is preferable in the present invention.

  Examples of means for weaving the glass fiber include means using a known loom. More specifically, means for weaving glass fibers using a jet loom (for example, an air jet loom or a water jet loom), a sulzer loom, a lepier loom, etc. Is mentioned. Examples of the weaving method include plain weave, satin weave, Nanako weave or twill weave. In the present invention, the weave is preferably a plain weave.

The warping step may be any step as long as the warp can be adjusted. For example, the process etc. which correct | amend the number of desired warps, or adjust length and tension suitably are mentioned.
The gluing step may be any step as long as a sizing agent can be applied to the warp. For example, a step of applying a sizing agent to the warp yarn using a known means may be mentioned. Examples of such known means include dip coating, roller coating, spray coating, flow coating or spray coating. The sizing agent may be a known sizing agent, and what is called a glass fiber sizing agent is preferable. The sizing agent is widely distributed in the market, and in the present invention, these commercially available products may be used as the sizing agent.

  In this invention, it is preferable to use the raw material of a glass fiber fabric as a raw material. In the present invention, by using the raw machine as a raw material, the constituent filaments are slippery and the opening can be performed more effectively.

[Manufacturing process]
The production method of the present invention usually includes a water treatment step (A) in which the glass fiber fabric is hydrated, and a water vapor treatment step (B) in which the water-containing glass fiber fabric is treated with steam to open the fiber. A flat glass fiber fabric may be produced by subjecting the glass fiber fabric to a water treatment and then to a water vapor treatment, or may be produced by simultaneously performing a water treatment and a water vapor treatment. For example, as shown in FIG. 1, a flat glass fiber fabric is manufactured. In FIG. 1, in (a), the water treatment is performed after the water treatment, whereas in (b), the water treatment and the water vapor treatment are performed simultaneously.

  The step (A) is not particularly limited as long as the glass fiber fabric is hydrated. Examples of means for hydrating the glass fiber fabric include a spray method, a dip method, a coating method, and a water curtain method. The treatment temperature is not particularly limited as long as it does not hinder the object of the present invention, and may be room temperature or under heating. That is, the treated water may be cold water, warm water, or hot water. Moreover, tap water may be sufficient and industrial water may be sufficient. Furthermore, it is also possible to add a surfactant to the treated water as necessary. The kind of surfactant is not specifically limited, A well-known thing can be used. In this step, the fiber opening is suitably performed even if the processing time is short. The specific processing time is not particularly limited, but is preferably 10 seconds or more. In this invention, the said glass fiber fabric can be made into the state which can be opened by water vapor | steam by implementing a process (A). Therefore, the step (B) is performed simultaneously with the step (A) or after the step (A).

（上記数式中、イは含水後のガラス繊維織物の質量を表し、ロは含水前のガラス繊維織物の質量を表す。） The step (B) is not particularly limited as long as it can be opened by spraying water vapor on one or both sides of the water-containing glass fiber fabric. Needless to say, in this step, the water-containing glass fiber fabric is used before drying. The water content of the glass fiber fabric used in this step is preferably 20% or more, more preferably 40 to 80%, and most preferably 50 to 80%. The “water content” is a value obtained by the following mathematical formula.

(In the above formula, a represents the mass of the glass fiber woven fabric after hydration, and B represents the mass of the glass fiber woven fabric before hydration.)

Water vapor generated in various known boilers may be used as the water vapor used in the step (B). As the water vapor, saturated water vapor is generally used, but superheated water vapor can also be used as necessary.
The means for spraying water vapor is not particularly limited as long as the object of the present invention is not impaired, and may be a known means. For example, a method of spraying from a spray nozzle, a method of spraying from a slit, a method of spraying from a nozzle plate having a large number of fine holes formed at equal intervals such as a water jet nozzle are suitable. The spray pressure of water vapor is not particularly limited as long as the object of the present invention is not impaired, but is preferably a low pressure, specifically 2 MPa or less, more preferably 0.1 to 1 MPa. Although the temperature of water vapor | steam is not specifically limited unless the objective of this invention is inhibited, Preferably it is 120-250 degreeC, More preferably, it is 120-200 degreeC. In the present invention, the time for performing the water vapor treatment is not particularly limited as long as the object of the present invention is not impaired, but the glass fiber fabric can be suitably opened in a short time of about several seconds to 30 seconds.
In this step, it is preferable to use a support such as a suction, a net, a wire net, and a flat plate for the glass fiber fabric at the time of water vapor injection in order to suppress the fluttering of the glass fiber fabric due to the water vapor injection. Moreover, in this process, it is preferable to heat the water-containing glass fiber fabric and subject it to steam treatment.

  Moreover, in this invention, when performing the said process (A) and process (B) simultaneously, it cools a saturated water vapor | steam, makes a part of water vapor | steam drain, and injects the water vapor | steam containing the drain obtained in this way. It may also be performed by spraying water vapor on the glass fiber fabric in water.

  The flat glass fiber woven fabric obtained through the above steps (A) and (B) is usually naturally dried or subjected to a drying treatment. The drying means for the drying process may be a known means such as using a dryer. The drying temperature is not particularly limited as long as the object of the present invention is not impaired, but is preferably 150 ° C. or higher from the viewpoint of productivity.

  The flat glass fiber woven fabric is clogged and further reduced in thickness. The thickness of the flat glass fiber fabric is preferably 0.75 times or less the thickness of the glass fiber fabric used as a raw material. The open area ratio is preferably 0.35 times or less the open area ratio of the glass fiber fabric used as the raw material. The flat glass fiber fabric is used for various applications in the electrical field, the architectural field, the industrial field, the medical field, and other fields, and is particularly useful as a printed wiring board. Here, “for printed wiring board” specifically means that it is useful as a reinforcing material for a laminated board used for manufacturing a printed wiring board.

  In the present invention, when a glass fiber woven fabric machine is used as a raw material, the flat glass fiber woven fabric is preferably subjected to a heat cleaning treatment after the steam treatment, and thus cannot be completely removed by the steam treatment. The sizing agent of the flat glass fiber fabric can be completely removed. The flat glass fiber fabric subjected to the heat cleaning treatment may be subjected to a surface treatment with a known surface treatment agent, and the surface treatment means may be a known means. For example, impregnation, application, or spraying with a surface treatment agent can be used.

  Examples of the surface treatment agent include a silane coupling agent, and more specifically, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-anilinopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride) ), Γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane and the like Is mentioned. In the present invention, the silane coupling agent is preferably N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), γ-anilinopropyltrimethoxysilane, or a mixture thereof. .

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely using an Example, this invention is not limited to these Examples.

Example 1
Glass fiber woven fabric (raw machine) {E02E manufactured by Unitika Glass Fiber Co., Ltd. (yarn: ECBC2250 1/0, density: warp 95/25 mm, weft 95/25 mm, woven structure: plain weave)} width 30 cm, length 40 cm The upper and lower sides of the raw machine cut with a jig were fixed. In addition, a steam nozzle (hole diameter: about 3 cm) was connected to a pipe from a boiler that generates saturated steam at a pressure of 0.45 MPa (temperature: 154 ° C.) using a heat-resistant pressure-resistant hose. Next, the heat-resistant pressure-resistant hose was intentionally exposed to the atmosphere to cool the water vapor, thereby obtaining water vapor containing drain (hot water). Subsequently, the water content treatment and the steam treatment were performed by bringing the gap between the living machine and the nozzle close to about 10 cm and injecting steam and warm water into the living machine to obtain a flat glass fiber fabric.

(Example 2)
Implemented except that E03E manufactured by Unitika Glass Fiber Co., Ltd. (yarn: ECC1200 1/0, density: warp 69/25 mm, weft 72/25 mm, woven structure: plain weave) was used as the glass fiber fabric (raw machine) A flat glass fiber fabric was produced in the same manner as in Example 1.

(Example 3)
Example, except that E06E (ECD450 1/0, density: warp 53/25 mm, weft 53/25 mm, woven structure: plain weave) manufactured by Unitika Glass Fiber Co., Ltd. was used as the glass fiber fabric (raw machine). A flat glass fiber fabric was produced in the same manner as in Example 1.

(Test Example 1)
The properties of the raw machine before treatment of Examples 1 to 3 and the flat glass fiber fabric after treatment were measured. The measurement results are shown in Table 1. In addition, the measuring method of each property is as follows.

(1) Measurement of Thread Width The width of the warp and the width of the weft were measured while observing the sample at 150 times with a microscope.
(2) Measurement of yarn gap The yarn gap of the warp yarn and the yarn gap of the weft yarn were measured while observing the sample magnified 150 times using a microscope.
(3) Calculation of the hole area ratio Using the thread width and density, the area of the void is calculated by subtracting the area of the thread from the entire area, and then the area of the hole area is divided by the entire area and multiplied by 100. Asked.
(4) Measurement of thickness The thickness of the sample was measured with a micrometer.
(5) Measurement of air permeability The air permeability of the sample was measured using a Fragile Permemeter manufactured by Toyo Seiki Seisakusho.

Example 4
Glass fiber fabric (raw machine) {E02E manufactured by Unitika Glass Fiber Co., Ltd. (yarn: ECBC2250 1/0, density: warp 95/25 mm, weft 95/25 mm, woven structure: plain weave)} in water in the aquarium After immersion and water treatment, a steam nozzle (hole diameter: about 3 cm) was connected to the piping from the boiler using a heat-resistant pressure-resistant hose, adjusted to saturated steam at a pressure of 0.5 MPa (temperature 159 ° C.), A flat glass fiber woven fabric was obtained by reducing the distance from the nozzle to about 1 cm and injecting water vapor into the living machine.

(Comparative Example 1)
A flat glass fiber woven fabric was obtained in the same manner as in Example 4 except that no water treatment was performed.

(Comparative Example 2)
A flat glass fiber woven fabric was obtained by opening the raw glass fiber woven fabric treated with water using a high-pressure water of 2.8 MPa in place of the steam treatment by water jet treatment.

(Test Example 2)
Table 2 shows the properties of the flat glass fiber fabrics obtained in Example 4 and Comparative Examples 1 and 2. Further, as reference data, unopened and untreated glass fiber woven raw material {E02E manufactured by Unitika Glass Fiber Co., Ltd. (thread: ECBC2250 1/0, density: warp 95/25 mm, weft 95/25 mm, woven structure: Table 2 also shows the properties of the plain weave)}. The yarn width, the yarn gap, the hole area ratio, the thickness, and the air permeability were measured by the same method as in Test Example 1. Further, the porosity reduction index and the thickness reduction index were measured by using the following mathematical formulas.

  From Table 2, it can be seen that Example 4 has an excellent fiber opening effect as compared with Comparative Examples 1 and 2. Further, in Comparative Example 1, it can be seen that the opening ratio was very high (opening ratio reduction index = 0.78), and satisfactory fiber opening effects were not obtained for all other properties. In Comparative Example 2, the hole area ratio and the yarn width, particularly the weft yarn width, were not satisfactory.

  According to the present invention, a flat glass fiber fabric useful for various uses in the electrical field, the architectural field, the industrial field, the medical field, and other fields, particularly useful for a printed wiring board, can be produced industrially advantageously.

It is a flowchart explaining the suitable manufacturing method of this invention.

Claims (5)

Producing how the flat glass fiber fabric, wherein the water content is opened to inject steam in air on the water glass fiber fabric is a 40% to 80%.   The manufacturing method according to claim 1, wherein the water vapor injection pressure is 0.1 to 1 MPa. The manufacturing method according to claim 1 , comprising a water-containing treatment for containing a glass fiber fabric, and a water-treatment for spraying the water-containing glass fiber fabric to open the fiber. Producing how according to claim 3, characterized in that the water treatment and the steam treatment at the same time. The glass fiber woven fabric and water treatment, then water was prepared how the flat glass fiber fabric according to claim 3, characterized in that the opening by injecting steam into the glass fiber fabric.

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