JP2007276249A - Glass scrim cloth prepreg material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass scrim cloth prepreg material which can prevent the lifting of the glass scrim cloth from the prepreg and mold FRP excellent in quality and characteristics and a method for producing the prepreg material. <P>SOLUTION: In the method for producing the glass scrim cloth prepreg material, reinforcing fibers and the glass scrim cloth are impregnated with a matrix resin to manufacture a unidirectional prepreg, a polyethylene film 0.02-0.05 mm in thickness and releasing paper having a water content of 2-6 wt.% overlie both sides of the unidirectional prepreg, respectively, and the laminate is wound into a roll. The viscosity of a resin incorporated into the polyethylene film side is higher than that of a resin incorporated into the releasing paper side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a glass scrim cloth prepreg that is an intermediate substrate for producing a fiber-reinforced composite material (hereinafter also referred to as FRP) suitable for sports use, and is a glass that can form FRP excellent in quality and mechanical properties The present invention relates to a method for manufacturing a scrim cloth.

  As is well known, a prepreg formed by combining a reinforcing fiber such as carbon fiber and a matrix resin such as a B-stage epoxy resin is used for FRP molding. Although there are various types of prepregs, unidirectional prepregs in which reinforcing fibers are aligned in a sheet shape in one direction are often used because the direction and amount of reinforcing fibers can be easily controlled. Many unidirectional prepregs are bonded with glass scrim cloth. This is called a glass scrim cloth prepreg.

  When using such a glass scrim cloth prepreg, for example, when forming a tubular body such as a fishing rod or a golf shaft, first, the glass scrim cloth bonded unidirectional prepreg is set so that the direction of the reinforcing fiber becomes a desired direction. In addition, it is cut into a desired shape, wound around a mandrel so that the direction of the reinforcing fiber is in the desired direction, and further a heat-shrinkable wrapping tape is wound thereon and heated to cause heat shrinkage of the wrapping tape. It is common to mold while using pressure. The glass scrim cloth prevents the arrangement of the reinforcing fibers from being disturbed at the time of cutting or winding, and gives a slightly reinforcing effect to the formed tubular body in a direction perpendicular to the direction in which the reinforcing fibers are aligned. Works.

  Now, such a glass scrim cloth prepreg is conventionally obtained by impregnating a matrix resin into a unidirectionally aligned sheet of reinforcing fibers to obtain a unidirectional prepreg, and then superposing the glass scrim cloth on the unidirectional prepreg, heating, The glass scrim cloth is manufactured by pressurizing and bonding a glass scrim cloth to the unidirectional prepreg (see, for example, Patent Document 1). That is, in this method, a glass scrim cloth is bonded using the tackiness of a unidirectional prepreg. However, according to this method, the glass scrim cloth is impregnated with a small amount of the matrix resin, so that the adhesive strength of the glass scrim cloth is low. When the prepreg is formed into a cylindrical object or the like, the prepreg material is usually cut together with the release paper, attached to the core, peeled off from the release paper, and rolled up to obtain the desired formed body. At this time, the prepreg material that has been cut before being wound around the core is often left for several hours, but in the meantime, with conventional glass scrim cloth prepreg, the release paper is moisture-absorbing in the environment at the time of manufacture and when left unattended. Further, since the dimensional change is caused by the residual pressure during prepreg processing, the glass scrim cloth is partially peeled off from the prepreg, and irregularities may be generated on the surface (hereinafter, the irregularities on the prepreg surface are referred to as “floating”). When the glass scrim cloth prepreg having such a float is wound around the core, wrinkles or voids are generated, resulting in a problem of reduced strength and poor quality of the resulting molded product. In order to prevent the glass scrim cloth prepreg material from being lifted after cutting, means such as shortening the leaving time after cutting or adjusting the ambient temperature to leave can be considered, but when such means are used However, it is difficult to increase the production efficiency of the molded body, and there is a problem that expensive capital investment is required.

Conventionally, in order to keep the dimensional change low, a release paper specially designed to have an elongation of 0.5% or less with respect to the dimension of the absolutely dry state at 60% relative humidity is pasted on one side of the prepreg. A method has been proposed in which a reinforcing woven fabric or a reinforced woven fabric impregnated with the same type of resin as that of the prepreg is bonded to the other surface (see, for example, Patent Document 2). It was necessary to use it, and there was a difficulty in the economical aspect.
Japanese Patent Publication No. 4-60008 JP 60-37811 A

  In view of the problems of the prior art, the present invention has a high adhesive strength of the glass scrim cloth, the occurrence of floating on the surface of the glass scrim cloth prepreg even if left after cutting, and the dimensional change of the glass scrim cloth prepreg are small, and the core body It is an object of the present invention to provide a method for producing a glass scrim cloth prepreg excellent in forming workability that does not float when it is wound around.

  In order to achieve the above object, a method for producing a glass scrim cloth prepreg of the present invention has the following configuration. That is, a reinforced fiber and a glass scrim cloth are impregnated with a matrix resin to produce a unidirectional prepreg, a polyethylene film having a thickness of 0.02 to 0.05 mm on one side and a moisture content of 2 to 6% by weight on the other side. It is a method for producing a prepreg material, each of which is laminated with a release paper, and wound into a roll, wherein the viscosity of the resin impregnated on the polyethylene film side is higher than the viscosity of the resin impregnated on the release paper side, A method for producing a glass scrim cloth prepreg material, or a glass scrim cloth is laminated on a unidirectionally aligned sheet of reinforcing fibers supplied continuously to form a laminated body, and then a matrix resin is applied to both sides of the laminated body. Superimpose the coated release paper so that the coated surfaces face each other, and heat and press while maintaining the clamping state. After transferring and impregnating the matrix resin into a laminated body, a method for producing a prepreg material in which one side of a release paper is peeled off, a polyethylene film having a thickness of 0.02 to 0.05 mm is pressure-bonded on the surface, and wound into a roll The release paper that does not peel is a glass having a moisture content of 2 to 6% by weight, and the viscosity of the resin impregnated on the polyethylene film side is higher than the viscosity of the resin impregnated on the release paper side that does not peel. It is a manufacturing method of a scrim cloth prepreg material.

  Moreover, in order to achieve the said objective, the glass scrim cloth prepreg of this invention has the following structure. That is, it is a glass scrim cloth prepreg manufactured by the above method.

  According to the production method of the present invention, even when the prepreg is left in a normal use environment at a temperature of 24 ° C. and a humidity of 50% Rh for a certain period of time, the quality of the glass scrim cloth prepreg deteriorates and the glass scrim cloth peels off. Thus, a glass scrim cloth prepreg having good handling properties and moldability is obtained. In addition, according to the glass scrim cloth prepreg of the present invention, voids (residual air) in the molded product can be reduced, and therefore FRP excellent in quality and mechanical properties can be provided.

  In the present invention, a reinforcing fiber and a glass scrim cloth are impregnated with a matrix resin to prepare a unidirectional prepreg, a polyethylene film having a thickness of 0.02 to 0.05 mm on one side, and 2 to 6% by weight of moisture on the other side. The prepreg material is produced by laminating release papers having a ratio and winding them in a roll shape, wherein the viscosity of the resin impregnated on the polyethylene film side is higher than the viscosity of the resin impregnated on the release paper side. This is a high manufacturing method of glass scrim cloth prepreg material.

  Here, as a method of impregnating the reinforcing fiber and the glass scrim cloth with the matrix resin, the glass scrim cloth is superposed on the unidirectional alignment sheet of the reinforcing fiber that is continuously supplied to form a superposed body, and then the superposition is performed. Release paper (hereinafter also referred to as resin film) coated with matrix resin on both sides of the body is overlapped so that the coated surfaces face each other, and the matrix resin is heated and pressurized while maintaining the sandwiched state. There is a method of transferring and impregnating the laminated body.

  As the release paper existing in the glass scrim cloth prepreg material obtained here, it is important to use one having a moisture content of 2 to 6% by weight. When the moisture content is less than 2% by weight, the variation in the moisture content due to moisture absorption increases, and the effect of preventing floating is reduced, which is not preferable. Further, if the release paper has a moisture content of more than 6% by weight, it is not preferable because the release paper contracts due to dehumidification due to the heat history during the manufacturing process and causes dimensional changes. The moisture content of the release paper used in the prepreg manufacturing method of the present invention is preferably 2.5 to 5% by weight, more preferably 3 to 5% by weight. Further, after the production of the prepreg material, the moisture content of the release paper is preferably 2.5 to 5% by weight, and more preferably 3 to 5% by weight.

Here, the moisture content is measured by the following method. That is, a sample to be measured is cut into a 100 mm square and weighed. This sample was dried in an oven at 120 ° C. for 1 hour, then cooled in a desiccator, weighed again, and the moisture content was calculated by the following equation.
Moisture content (% by weight) = {(weight before drying) − (weight after drying)} / (weight before drying) × 100
In the present invention, the glass scrim cloth surface layer is covered with a polyethylene film in order to protect the surface layer of the glass scrim cloth prepreg and suppress moisture absorption. As a polyethylene film to be used, a polyethylene film having a thickness of 0.02 to 0.05 mm is used. The polyethylene film is preferably transparent since the surface of the prepreg is visible when the defect is confirmed after the prepreg is produced.

  In the production method of the present invention, as an example of a method for producing a unidirectional prepreg by impregnating a reinforcing fiber and a glass scrim cloth with a matrix resin, a glass scrim cloth is applied to a unidirectionally aligned sheet of reinforcing fibers supplied continuously. After stacking, the release paper with matrix resin applied on both sides of the stack is stacked so that the coated surface faces the stack, and heating and heating are performed while maintaining the sandwiched state. The matrix resin is transferred and impregnated into the laminated body. After impregnation, the release paper on one side is peeled off, and a polyethylene film is pressure-bonded to the surface from which the release paper is peeled off. It is preferable to release the release paper on the glass scrim cloth side and to dispose a polyethylene film on the glass scrim cloth side because the quality of the glass scrim cloth and prepreg surface can be easily confirmed. After the polyethylene film is pressure-bonded as described above, the obtained prepreg material is wound into a roll.

  Moreover, in the manufacturing method of the glass scrim cloth prepreg material of this invention, what has a higher viscosity than resin by the side of the release paper which exists in a prepreg material is used as resin by the side of a polyethylene film. Generally, when only a resin having a low viscosity is used, if the prepreg is left as it is, the resin sinks into the prepreg layer, so that the adhesive force between the glass scrim cloth and the prepreg is reduced, but the resin on the polyethylene film side When a material having a high viscosity is used, not only can the glass scrim cloth and the prepreg be impregnated firmly, but also the sinking is delayed, so that the adhesion between the glass scrim cloth and the prepreg is improved. Preferably, the viscosity of the resin on the polyethylene film side in the temperature range of 120 ° C. is higher than the viscosity of the resin on the release paper side existing in the prepreg material. Further, it is more preferable that the viscosity of the resin on the polyethylene film side is higher than the viscosity of the resin on the release paper side existing in the prepreg material over a temperature range of 100 to 130 ° C. Here, the resin viscosity can be measured by dynamic viscoelasticity measurement. In the dynamic viscoelasticity measurement at a measurement frequency of 0.5 Hz and 120 ° C., the viscosity of the resin on the polyethylene film side is 2500 to 3000 Pa · s, and the viscosity of the release paper side resin existing in the prepreg material is 1500 to 2000 Pa · s. It is preferable to be within the range.

  When the viscosity of the resin on the polyethylene film side is less than 2500 Pa · s, the resin flows to both ends when the reinforcing fiber is impregnated, and the impregnation property to the reinforcing fiber may be deteriorated. In addition, the resin may protrude from the release paper and adhere to the device, resulting in a decrease in work efficiency. On the other hand, when the viscosity of the resin on the polyethylene film side exceeds 3000 Pa · s, the impregnation property to the reinforcing fibers may be deteriorated and the workability of the prepreg may be lowered.

  On the other hand, if the viscosity of the resin on the side of the release paper existing in the prepreg material is less than 1500 Pa · s, the shape retention of the obtained prepreg is reduced or tack is insufficient, and thereby workability in the process of laminating the prepreg. May decrease. Further, when the viscosity of the resin on the release paper side exceeds 2000 Pa · s, the impregnation property to the prepreg is lowered, and therefore workability may be lowered in the step of laminating the obtained prepreg.

  If the viscosity of the resin on the polyethylene film side and the resin on the release paper side is within the above range, the adhesion between the glass scrim cloth and the prepreg is improved, and the glass scrim cloth does not peel off from the prepreg surface.

The viscosity of the matrix resin conforms to JIS K 5600-2-3 (1999) "Paint General Test Method-Part 2: Properties and Stability of Paint-Section 3: Viscosity (Cone / Plate Viscometer Method)". To measure. The cone angle is 0.8 °, the diameter is 48 mm, the shear rate during measurement is 7.5 Nsec ⁻¹ , and the measurement is performed in the temperature range to be measured (for example, 120 ° C.).

  As the matrix resin, either a thermoplastic resin or a thermosetting resin can be appropriately selected according to the purpose.However, when the strength and rigidity of the molded body are required, such as golf or fishing rod, the thermosetting resin is used for that purpose. Accordingly, it is preferably used. Examples of thermosetting resins include epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins, cyanate ester resins, etc. Especially, epoxy resins and resin compositions mainly composed of epoxy resins are used. can do.

  The production method of the present invention will be described more specifically using an example. In FIG. 1, reinforcing fiber bundles 1 drawn out from a plurality of packages (not shown) are guided to comb 4 through free rotating aligning rolls 2 and 3 and are aligned in parallel in one direction and in sheet form. The unidirectional alignment sheet 5 is obtained. A glass scrim cloth 7 supplied via an introduction roll 6 is superimposed on the one-way aligning sheet 5 from above.

  Next, the upper release paper 9 which is supplied to the superposed body of the one-way aligning sheet 5 and the glass scrim cloth 7 through the introduction roll 8 and coated with a B-stage thermosetting resin on one surface. And the release paper 11 introduced through the introduction roll 10 and coated with the B-stage thermosetting resin on one side in a similar manner so that the resin-coated surface is directed to the side of the body. After the body is heated by the first heater 12 to reduce the viscosity of the thermosetting resin, the reinforcing fiber bundle 1 is pushed by heating and pressurizing with the first impregnation roll 13 composed of the base roll 13a and the nip roll 13b. Expansion and transfer to the unidirectional alignment sheet 5 and glass scrim cloth 7 of the thermosetting resin on the release papers 9 and 11 and impregnation are performed. Here, as the release paper that does not peel in the process described later, one having a moisture content of 2 to 6% by weight is used. Of course, both release papers may have a moisture content of 2 to 6% by weight. Such transfer and impregnation are performed by the second heater 14, the second impregnation roll 15 comprising the base roll 15a and the nip roll 15b, and the third heater 16, the third impregnation roll 17 comprising the base roll 17a and the nip roll 17b. 3 steps. Thus, a glass scrim cloth prepreg is obtained. After the transfer and impregnation of the thermosetting resin, the upper release paper 9 is peeled off through the outlet rolls 18 and 19, and a thickness of 0.02 is formed on the surface of the glass scrim cloth prepreg. A transparent polyethylene film having a thickness of ˜0.05 mm is pasted by the base roll 21a and the nip roll 21b, and the glass scrim cloth prepreg material is wound into a roll together with the release paper 11 having a lower moisture content of 2 to 6% by weight. And

  The glass cloth scrim prepreg material of the present invention is a glass scrim cloth prepreg material obtained by the production method of the present invention described above.

  The glass scrim cloth prepreg in the present invention is more preferable as the fiber content is higher because the strength of the FRP obtained can be maintained even when the weight is reduced. However, if the fiber content is too high, the adhesiveness between the glass scrim cloth and the prepreg is lowered, and the glass scrim cloth is partially peeled off from the prepreg, and the float tends to occur. Wrapping around the body will cause wrinkles and voids, resulting in a decrease in strength of the resulting FRP, and the problem of poor quality, so the fiber content is preferably 50 to 88% by weight, More preferably, it is 67 to 88% by weight.

  The reinforcing fiber contained in the glass scrim cloth prepreg material of the present invention can be appropriately selected according to its required strength as long as it is generally used as a reinforcing fiber. For example, carbon fiber, glass fiber, Kevlar, boron Fiber, silicon carbide fiber, chemical fiber such as nylon, natural fiber, metal fiber such as alumina fiber, or the like may be used, and these may be combined or may be combined with other organic fibers.

The amount of fibers per unit area is not particularly limited, but when a molded product such as a golf shaft or a fishing rod is manufactured in a light weight, those having a low amount of fibers per unit area are preferably used. 10-300 g / m < ² > is preferable at the fiber amount per area, 25-200 g / m < ² > is more preferable, Furthermore, 55-200 g / m < ² > is preferable.

  The glass scrim cloth prevents the arrangement of the reinforcing fibers of the unidirectional prepreg from being disturbed and gives a slight reinforcing effect in the direction orthogonal to the direction of the reinforcing fibers when the FRP is molded. It is preferable that the weft density (density in the direction orthogonal to the direction of the reinforcing fiber of the unidirectional prepreg) is slightly higher than the density in the direction of the reinforcing fiber of the prepreg, and the warp density is 39 to 60 / 25.4 mm. It is preferable to use a weft density of about 47 to 70 pieces / 25.4 mm.

The glass scrim cloth prepreg material of the present invention has a scrim cloth peel strength (hereinafter also referred to as initial peel strength) of 1,000 g / 25 mm or more in an atmosphere of a temperature of 24 ° C. and a humidity of 50% Rh, and The rate of decrease in peel strength (hereinafter also referred to as peel strength after standing) when left in the above atmosphere for 10 days is preferably 5% or less.

If the initial peel strength is less than 1000 g / 25 mm, there may be a problem that the glass scrim cloth is easily peeled off from the prepreg. Such a peel strength is preferably as high as possible from the viewpoint of making it difficult for the glass scrim cloth to peel off from the prepreg, but 2000 g / 25 mm is often sufficient for the purpose of the present invention. Further, if the reduction rate of peel strength after standing exceeds 5%, the glass scrim cloth may be easily peeled off from the prepreg when left in the above atmosphere for 10 days, and may be peeled off during handling. The smaller the rate of decrease in peel strength later, the better. However, it is often difficult to make it 1% or less due to the sinking or transformation of the resin. The peel strength of the glass scrim cloth is measured as follows. That is, first, a glass scrim cloth prepreg material is cut into a width of 25 mm and a length of 300 mm with the direction of the reinforcing fiber as the length direction to obtain a test piece. Next, the glass scrim cloth of a portion from one end of the test piece to 20 mm is peeled off, and the glass scrim cloth is attached to one chuck of the tensile tester and the one-way prepreg is attached to the other chuck at the peeled portion. Then, a tensile test is performed at a speed of 100 mm / min, and the glass scrim cloth and the unidirectional prepreg are peeled off in the 180 ° direction. The maximum load at the time of peeling is defined as the peel strength. When the glass scrim cloth breaks in the middle, the load at the time of breakage is taken as the peel strength. This tensile test is performed in an atmosphere at a temperature of 24 ° C. and a humidity of 50% Rh. The peel strength of the glass scrim cloth in an atmosphere of temperature 24 ° C. and humidity 50% Rh, that is, the initial peel strength is Sb, and the peel strength when left in that atmosphere for 10 days is Sa. The rate is obtained by the following equation.

    Decrease rate of peel strength (%) = ((Sb−Sa) / Sb) × 100

Hereinafter, the present invention will be described more specifically with reference to examples.
<Example 1>
A glass scrim cloth prepreg was manufactured using the method shown in FIG.

As the reinforcing fibers, carbon fibers having an average single fiber diameter of 7 μm, the number of single fibers of 12,000, a tensile strength of 4,900 MPa, and a tensile elastic modulus of 230 GPa are used, and the fiber amount per unit area of the carbon fibers is 100 g / m ² . A plurality of lines were aligned in one direction to obtain a one-way alignment sheet.

  In addition, as a matrix resin, 100 parts by weight of a mixed resin containing a phenol novolac type epoxy resin and a bisphenol A type epoxy resin in a ratio of 7: 3 by weight, with respect to dicyandiamide and 3- (3,4-type) as a curing agent. Dichlorophenyl) -1, 1dimethylurea was blended at a weight ratio of 5: 3, and the base was used. And, 100 parts by weight of this base with 5 parts by weight of polyvinyl formal added as a viscosity modifier (hereinafter referred to as matrix resin A) and 10 parts by weight (hereinafter referred to as matrix resin B) Two types of matrix resins were used. The viscosity of the matrix resin A at 120 ° C. is 1700 Pa · s, and that of the matrix resin B is 2800 Pa · s.

Further, as the release paper, the matrix resin A was applied to a release paper (hereinafter referred to as release paper A) having a moisture application rate of 0.5% by weight or less so that the resin amount per unit area was 25 g / m ² . A resin sheet (hereinafter referred to as “resin film A”) and the above matrix resin B on a release paper (hereinafter referred to as “release paper B”) having a moisture application rate of 2 to 6% by weight so that the resin amount per unit area is 25 g / m ^2. Two types of coatings (hereinafter referred to as “resin film B”) were used.

A glass scrim cloth (fiber amount per unit area: 24.5 g / m ² , warp density: 60 pieces / 25 mm, weft density: 51 pieces / 25 mm) is overlaid on the unidirectionally aligned sheet, and further glass scrim The resin film A was overlapped with the cloth, and the resin film B was overlapped with the unidirectionally aligned sheet. The impregnation roll temperature is 120 ° C., and the linear pressure is 1.5 kg / cm for the first stage, 1.5 kg / cm for the second stage, and 1.0 kg / cm for the third stage, and then glass scrim cloth. A 0.03 mm thick polyethylene film was attached to the surface and wound into a roll to obtain a glass scrim cloth prepreg material. The specifications of the obtained glass scrim cloth prepreg material were as follows.

Matrix resin content: 33% by weight
Peel strength (initial): 2,550 g / 25 mm
Peel strength (after standing for 10 days): 2,510 g / 25 mm
Glass scrim cloth prepreg quality after standing for 10 days: No floating (no peeling)
FRP quality applied to glass scrim cloth prepreg after standing for 10 days: No void Peel strength reduction rate: 1.6%
<Example 2>
In Example 1, except that the matrix resin A was changed to one added with 3 parts by weight of polyvinyl formal as a viscosity modifier with respect to 100 parts by weight of the base, and changed to one added with 9 parts by weight of matrix resin B. A glass scrim cloth prepreg material was obtained in the same manner as in Example 1. The viscosity of the matrix resin A at 120 ° C. is 1550 Pa · s, and that of the matrix resin B is 2600 Pa · s. The specifications of the obtained glass scrim cloth prepreg material were as follows.

Matrix resin content: 32% by weight
Peel strength (initial): 2,460 g / 25 mm
Peel strength (after standing for 10 days): 2,380 g / 25 mm
Glass scrim cloth prepreg quality after standing for 10 days: No floating (no peeling)
FRP quality applied to glass scrim cloth prepreg after standing for 10 days: No void Peel strength reduction rate: 3.2%
<Comparative Example 1>
A glass scrim prepreg material was obtained in the same manner as in Example 1 except that both release papers A and B were those having a moisture content of 0.5% by weight. The specifications of the obtained glass scrim cloth prepreg were as follows.

Matrix resin content: 32% by weight
Peel strength (initial): 2,400 g / 25 mm
Peel strength (after standing for 10 days): 1,500 g / 25 mm
Glass scan after standing for 10 days Klim cross prepreg quality: Glass scan after standing 1 m ² around 50% of the floating generating 10 days Klim cross prepreg applied FRP quality: rate of decrease in the void Peeling strength: 37.5%
<Comparative example 2>
The release papers A and B were both made to have a moisture content of 0.5% by weight, and the matrix resin A was changed to 100% by weight of the base resin with 1 part by weight of polyvinyl formal added as a viscosity modifier. A glass scrim prepreg material was obtained in the same manner as in Example 1 except that the amount was changed to 15 parts by weight. The viscosity of the matrix resin A at 120 ° C. is 1000 Pa · s, and that of the matrix resin B is 3300 Pa · s. The specifications of the obtained glass scrim cloth prepreg were as follows.

Matrix resin content: 32% by weight
Peel strength (initial): 1,800 g / 25 mm
Peel strength (after standing for 10 days): 830 g / 25 mm
Glass scan after standing for 10 days Klim cross prepreg quality: Glass scan after standing 1 m ² around 70% of the floating generating 10 days Klim cross prepreg applied FRP quality: rate of decrease in the void Peeling strength: 53.9%
<Comparative Example 3>
In Comparative Example 1, except that the matrix resin A was changed to one added with 6 parts by weight of polyvinyl formal as a viscosity modifier with respect to 100 parts by weight of the base, and changed to one added with 5 parts by weight of the matrix resin B. A glass scrim cloth prepreg material was obtained in the same manner as in Comparative Example 1. The viscosity of the matrix resin A at 120 ° C. is 2150 Pa · s, and that of the matrix resin B is 1700 Pa · s. The specifications of the obtained glass scrim cloth prepreg material were as follows.

Matrix resin content: 32% by weight
Peel strength (initial): 2,220 g / 25 mm
Peel strength (after standing for 10 days): 1,630 g / 25 mm
Glass scan after standing for 10 days Klim cross prepreg quality: Glass scan after standing 1 m ² around 40% of the floating generating 10 days Klim cross prepreg applied FRP quality: rate of decrease in the void Peeling strength: 26.6%

It is the schematic which shows a mode that the scrim cloth bonding one-way prepreg of this invention is manufactured.

Explanation of symbols

1: reinforced fiber bundle 2: aligning roll 3: aligning roll 4: comb 5: unidirectional aligning sheet 6: introduction roll 7: scrim cloth 8: introduction roll 9: release paper coated with matrix resin 10: introduction roll 11: Release paper coated with matrix resin 12: First heater 13: First impregnation roll
13a: Base roll
13b: Nip roll 14: Second heater 15: Second impregnation roll
15a: Base roll
15b: Nip roll 16: Third heater 17: Third impregnation roll
17a: Base roll
17b: nip roll 18: outlet roll 19: outlet roll 20: polyethylene film 21a: base roll 21b: nip roll 22: roll body of glass scrim cloth prepreg

Claims (7)

  A unidirectional prepreg is prepared by impregnating a reinforcing fiber and a glass scrim cloth with a matrix resin, a polyethylene film having a thickness of 0.02 to 0.05 mm on one side and a moisture content of 2 to 6% by weight on the other side. A method for producing a prepreg material in which pattern paper is laminated and wound into a roll, wherein the viscosity of the resin impregnated on the polyethylene film side is higher than the viscosity of the resin impregnated on the release paper side. A method for producing a cross prepreg material.   A glass scrim cloth is laminated on a unidirectionally aligned reinforcing fiber sheet that is continuously supplied to form a laminated body, and then a release paper having a matrix resin coated on both sides of the laminated body is coated on the laminated body side. While maintaining the sandwiched state, heat and pressurize, transfer and impregnate the matrix resin into the overlapped body, peel off one of the release papers, and remove the thickness 0.02 on the surface. A method for producing a prepreg material in which a polyethylene film of ˜0.05 mm is pressure-bonded and wound up into a roll, and the release paper that does not peel off has a moisture content of 2 to 6% by weight and is on the side of the release paper that does not peel off A method for producing a glass scrim cloth prepreg material in which the viscosity of the resin impregnated on the polyethylene film side is higher than the viscosity of the resin to be impregnated.   Release resin side having a viscosity in dynamic viscoelasticity measurement at a measurement frequency of 0.5 Hz and 120 ° C., the resin impregnated on the polyethylene film side is 2500 to 3000 Pa · s, and has a moisture content of 2 to 6% by weight. The method for producing a glass scrim cloth prepreg material according to claim 1 or 2, wherein the resin impregnated into the glass scrub is 1500 to 2000 Pa · s.   A glass scrim cloth prepreg material manufactured by the method according to claim 1.   The glass scrim cloth prepreg material according to claim 4, wherein the fiber content is 50 to 88% by weight. Amount of fibers per unit area is ^{10g / m 2 ~300g / m 2} , the glass scrim cloth prepreg material according to claim 4 or 5.   The peel strength of the scrim cloth in an atmosphere at a temperature of 24 ° C and a humidity of 50% Rh is 1000 g / 25 mm or more, and the reduction rate of the peel strength when left in the same atmosphere for 10 days is 5% or less. 6. A glass scrim cloth prepreg material described in any one of 6 above.

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