JPS5865053A - Unidirectionally reinforced composite material intermediate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite intermediate material suitable for molding.

Generally, when a composite material is used to mold a member that requires high strength and rigidity, a unidirectionally reinforced material is often used to create tubular, plate-shaped, etc. However, with this material, even if the matrix resin flows slightly during molding, the fibers do not flow smoothly, so when molding something with a slightly uneven shape, the lamination work must be done with great precision prior to molding. It is necessary. This work is generally very elaborate and expensive.

Molded products with irregularities are often formed by press molding, but if the fibers and resin can flow together and fit into the mold, molding work including lamination work is very easy. Materials that have been developed in the past with such characteristics include, for example, fiber bundles cut into 10 to 100 mm lengths in random directions; There is a molding compound (hereinafter referred to as 8MC) material that is used in various applications.

However, the 8MC material is randomly oriented and is suitable for molding items that require equal strength and rigidity in all directions, but it is not suitable for molding items that require strength and rigidity in a particular direction. It is something that is lacking.

As mentioned above, unidirectionally reinforced materials and randomly oriented reinforced materials each have their advantages and disadvantages, and in practice, they are used together, or SMC materials with unidirectional fibers added have been developed.

The present invention does not require the complicated molding operations conventionally used to mold molded products that require strength and rigidity in a specific direction, and the molding material has good moldability.
Moreover, it is an object of the present invention to provide a sheet-like material that can maintain high strength and rigidity.

A specific example of the molding material intermediate of the present invention is one in which a unidirectional carbon fiber-reinforced prepreg is cut into lengths of 1 to 200 mm in the longitudinal direction, and which maintains the original shape of the prepreg. can be mentioned. An example is shown in FIG. If the length of the reinforcing fibers is less than 1, the orientation of the fibers will be poor during molding, and the aspect ratio will be low, making it difficult to develop the strength and rigidity of the resulting molded product. Furthermore, if the number of fibers exceeds 200, it becomes difficult for the fibers to flow, resulting in poor moldability.

Such materials are difficult to handle as they separate from the cut section, and are usually pasted onto uncut pieces of paper or releasable or non-releasable films. good.

In order to make it even easier to handle, we stacked two pre-cut prepreg sheets with the same fiber direction,
Alternatively, it can be rolled into a cylinder or cylinder. If the cut portions of the fibers of the laminated fibers do not overlap, the release paper or film will not fall apart, making it an easy-to-handle material.

In order to achieve this purpose more clearly, it is preferable that the cut portion is not perpendicular to the fiber direction of the prepreg, but is deviated from the perpendicular angle. This is because when the prepreg surfaces are pasted together, the cut portions only intersect at points, as shown in FIG. Also, instead of cutting the entire width of the prepreg in a single straight line, it may be cut in a zigzag pattern.

Examples of reinforcing fibers used in the material of the present invention include glass fibers, vertical fibers, verticalized silicon fibers, alumina fibers,
Examples include boron fiber and aramid fiber.

In addition, resins include thermosetting resins such as epoxy resins, unsaturated polyester resins, and phenolic resins, and thermoplastic resins such as nylon 6, nylon 66, muis, polycarbonate, polybutylene terephthalate, polyphenylene sulfide, and polyacetal. For example, polyester resins can be mentioned. It can also be applied to metal matrices such as aluminum, nickel, and copper.

Further, the thickness of the sheet-like material according to the present invention is preferably in the range of 0.05 to several -.

In order to make the material according to the present invention, for example, a unidirectional reinforcing fiber aligned prepreg is made, cut on a steel belt while being cut, pasted on release paper, and rolled up to form a continuous product. Obtainable. Then, the surfaces of the two obtained four-shaped materials are bonded to each other, and the material is rolled up using a heated roll or the like.

Alternatively, cut the sheet-shaped Gripreg appropriately and make 2 of these.
It is also possible to stack the sheets one on top of the other.

A suitable application of the material according to the present invention is, for example, press-molding the teeth of a gear using a mold. Using this material, it is possible to arrange the fibers along the tooth pattern and effectively strengthen the strength of the tooth. This can be applied to various gears including worm gears. It can also be applied to bolts and nuts in a similar manner.

In addition, in press molding of FRP, if it is used particularly for parts where high strength and rigidity are desired, it can be effectively used even for parts with complex shapes.

In order to use it, the material provided by the present invention is laminated in the required number and in the required direction, and molded at appropriate temperature and pressure conditions according to the type of thermosetting resin or thermoplastic resin. can.

As described above, the unidirectionally reinforced composite material intermediate according to the present invention is an excellent material that is extremely effective in that it is easily moldable and exhibits high strength and rigidity.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an intermediate of the present invention obtained by cutting a single unidirectionally reinforced composite material intermediate obliquely in the width direction, and Fig. 2 is a plan view of the intermediate of the present invention obtained by overlapping two intermediates shown in Fig. 1. FIG. 2 is a schematic diagram of a unidirectionally reinforced composite material intermediate obtained by this method. l... Unidirectionally reinforced composite material intermediate 2 - Release paper or film 3, s' - Cut surface patent Applicant
Mitsubishi Rayon Co., Ltd. Representative Patent Attorney 1) Taketoshi Mura Figure 1 Figure 2

Claims (2)

[Claims] (1) 1 to 200 fibers arranged closely in the width direction
A unidirectionally reinforced composite material intermediate, which is cut into lengths and arranged on a release paper or film, so that the entire material is in the form of a sheet. (2) The unidirectionally reinforced composite material intermediate according to claim 1, wherein the cut surface is not perpendicular to the direction in which the fibers are arranged.