JP2012040689A - Method of manufacturing fiber-reinforced composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a fiber-reinforced composite material having superior adhesiveness to an adhesive material without preprocessing of the fiber-reinforced composite material before bonding.SOLUTION: A polypropylene film or a polyethylene terephthalate film is arranged between a surface on a molding die side of a laminate formed by laminating prepregs and the molding die, then the laminate is cured, when curing the laminate.

Description

  The present invention relates to a method for producing a fiber-reinforced composite material. Furthermore, it is a manufacturing method of the fiber reinforced composite material excellent in adhesiveness with an adhesive agent, without performing the pre-processing process before adhesion | attachment.

  Since fiber reinforced composite materials are lightweight and have high strength, they are widely used as members for golf shafts, tennis rackets, aircraft, automobiles, ships, and the like. A member made of such a fiber-reinforced composite material is used by being bonded to another member as necessary. On the other hand, in order to manufacture a fiber reinforced composite material, a prepreg obtained by impregnating a reinforcing fiber with a resin in advance is laminated to form a laminate, and a fluororesin film is used as a release film between the laminate and the mold. The method of curing is generally used. However, even if an adhesive is directly applied to the fiber reinforced composite material produced by this method, there are cases where good adhesion cannot be obtained. In order to avoid this and improve the adhesion, it is common to perform a pretreatment on the adherend surface of the member. As such adhesion pretreatment, methods such as sanding, grit blasting and shot blasting are widely used.

JP 2007-244980 A

  If a pretreatment process such as sanding, grit blasting, or shot blasting is performed, depending on the treatment conditions, the resin layer on the surface of the fiber reinforced composite material may be excessively removed, and the internal fibers may be damaged. Therefore, in these methods, it is difficult and difficult to set and manage conditions for avoiding a decrease in adhesion between the adhesive and the fiber reinforced composite material and a decrease in strength of the fiber reinforced composite material. In addition, these methods involve a pretreatment process, which increases the production time and requires equipment for the pretreatment process.

  This invention is made in view of such a situation, Comprising: It provides the manufacturing method of the fiber reinforced composite material excellent in adhesiveness with an adhesive agent, without giving the pre-processing process before adhesion | attachment. It is what.

  As a result of intensive studies, the present inventor has reached the present invention. That is, a method for producing a fiber-reinforced composite material in which a polypropylene film or a polyethylene terephthalate film is placed between a molding die surface and a molding die when curing a laminate in which prepregs are laminated. It is.

  ADVANTAGE OF THE INVENTION According to this invention, the fiber reinforced composite material excellent in adhesiveness with an adhesive agent can be manufactured, without performing the pre-processing process before adhesion | attachment.

In this invention, the laminated body which laminated | stacked the prepreg is hardened | cured via a polypropylene film or a polyethylene terephthalate film between the surface at the side of the shaping | molding die of this laminated body, and a shaping | molding die. There is no particular limitation on the thickness of the film. A thickness that is easy to handle can be selected as appropriate. A polyethylene terephthalate film that has been treated with a release agent is preferred because of good release properties after molding. A polypropylene film is preferable because an unstretched film has good release properties after molding. The polypropylene film itself has releasability from the prepreg. On the other hand, in the polyethylene terephthalate film, the mold release treatment applied to the surface thereof is difficult to transfer to the surface of the molded product after molding. Polypropylene film and preferably polyethylene terephthalate film which has been subjected to release treatment can be used in the same manner. The present invention is not limited to the type of prepreg, the material and shape of the mold, the molding temperature condition, and the molding pressure condition.
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, it is not restrict | limited to this.

[Polypropylene film]
The following films were prepared as polypropylene films.
FA No. 40 (unstretched polypropylene film) manufactured by Futamura Chemical Co., Ltd.
[Fluorine resin film]
The following films were prepared as fluororesin films.
Asahi Glass Co., Ltd. Aflex 25MW1250NT (thickness 25μm)

<Example 1>
A polypropylene film is placed on a flat metal plate, and a prepreg (a unidirectional carbon fiber prepreg TR350G125 manufactured by Mitsubishi Rayon Co., Ltd. TR125G125; basis weight 125 g / m ² ) cut into a 10 cm square is placed in order from the bottom in the fiber longitudinal direction. [0 ° / 90 ° / 90 ° / 0 °] were laminated in four layers. Next, a single polypropylene film was placed thereon, and a metal flat plate was placed thereon. Next, these were covered with a polyester nonwoven fabric A3000 manufactured by Airtech Co., Ltd. as a breather, and an outlet for vacuuming was arranged. These were bagged from the top with a nylon film, and the bottom metal plate and the nylon film were fastened with a sealant. The pulling port penetrated the nylon film. These were heated in an autoclave at a heating rate of 2 ° C./min to 130 ° C. and held for 90 minutes, and heated and pressurized at a pressure in the kettle of 0.6 MPa and a pressure in the bag of 80 kPa or less to produce a flat plate of fiber-reinforced composite material. .

  To this fiber reinforced composite material degreased with acetone, a MMA adhesive (Plexus MA310 manufactured by ITW Industry Co., Ltd.) is long so as to be substantially parallel to one side and include the center of the flat plate. A thickness of about 10 cm, a width of about 15 mm, and a thickness of 50 μm were applied and cured at room temperature. Next, in the center portion of the flat plate, the adhesive is made so that the width direction of the adhesive obtained by curing the cellophane tape (CT405AP-24; width 24 mm, manufactured by Nichiban Co., Ltd.) on the flat plate is approximately 90 °, and the width direction of the cello tape is approximately 90 °. It pasted so that it might become the length beyond the width of an agent. The adhered cellophane was peeled off while pulling in the diagonal direction (approximately 45 °) of the flat plate, and the state where the cured adhesive was peeled off was observed. The results are shown in Table 1.

<Example 2>
The same procedure as in Example 1 was performed except that the prepreg was changed to Mitsubishi Rayon Co., Ltd. unidirectional carbon fiber prepreg TR380G100 (weight per unit area: 125 g / m ² ). The results are shown in Table 1.

<Comparative Example 1>
The same procedure as in Example 1 was performed except that the film disposed between the prepreg and the mold was changed to a fluororesin film. The results are shown in Table 1.

<Comparative example 2>
The same procedure as in Example 2 was performed except that the film disposed between the prepreg and the mold was changed to a fluororesin film. The results are shown in Table 1.

Claims (1)

  A method for producing a fiber-reinforced composite material, wherein a polypropylene film or a polyethylene terephthalate film is placed between a prepreg and a mold and cured.