JPH07214713A - Manufacture of laminated sheet of composite material having very fine unevenness - Google Patents

Abstract

PURPOSE:To greatly improve the productivity and sliding properties and remarkably reduce the cost. CONSTITUTION:In the manufacture of a laminated sheet of a composite material having very fine unevenness, a plurality of prepreg sheets 3 which are comprised by infiltrating thermoplastic resin into a fiber base are piled up and the same is heated, pressurized and molded by placing between pressurizing sheets 4, at the time of performance of heating, pressurization and molding, a film 1 having the very fine uneven state on the surface facing on at least the prepreg sheet 3 is placed beforehand between the pressurizing sheet 4 and prepreg sheet 3. Hereby, this is a manufacture of the laminated sheet of the composite material having the very fine unevenness, which transfers the very fine unevenness to the surface of the laminated sheet of the composite material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite laminate having fine irregularities, which is suitable for use as a shutter blade of a focal plane shutter.

[0002]

2. Description of the Related Art A composite laminated plate produced by stacking a plurality of prepreg sheets obtained by impregnating a thermosetting resin on a fibrous base material and heat-pressing the prepreg sheets has no sliding property. It is sufficient and the light reflectance is too high. Therefore, it cannot be used as it is, for example, as a material for shutter blades, but the problem of sliding property and light reflectance can be greatly improved by providing fine irregularities on the surface.

The term "prepreg sheet" as used herein means a resin-reinforced fiber after impregnating a thermosetting resin liquid (for example, an uncured liquid material of an epoxy resin or an unsaturated polyester) which is a precursor of a matrix resin. The resin liquid was brought into a B stage state (temporarily solidified and has no apparent fluidity, but can be finally cured by heating).

Conventionally, a method of manufacturing a composite material laminated plate having fine irregularities is such that a plurality of prepregs impregnated with a resin are superposed on a fiber base material, and when the prepregs are heat-pressed, they are finely ground in advance by precision grinding or the like. It was a technique of using a press plate (pressurizing plate) on which unevenness was processed, and transferring the unevenness to the surface of a molded product (composite material laminated plate).

[0005]

However, in the conventional method for manufacturing a composite material laminated plate having fine irregularities, the irregularities of the press plate (pressurizing plate) are directly transferred to the surface of the molded product (composite material laminated plate). Therefore, high precision is required for uneven processing,
Therefore, there is a problem that it is difficult to manufacture a press plate (pressurizing plate).

If the press plate (pressurizing plate) is flawed, it leads to a fatal defect of the molded product (composite material laminated plate), so that the press plate (pressurizing plate) can be handled (including maintenance) sufficiently. Therefore, there is a problem that work efficiency is lowered, that is, productivity is lowered. Further, when molding is performed by this manufacturing method, it is necessary to apply a release agent to the press plate in order to prevent the composite material laminated plate from sticking to the press plate (pressurizing plate). Therefore, the release agent also adheres to the molded product (composite material laminated plate).

Therefore, it is necessary to wash the molded product to remove the release agent adhering to the molded product (composite material laminated plate) before applying the lubricating black paint (sliding agent). However, it is extremely difficult to completely remove the release agent, and there is a problem that the release agent remains in the molded product and the adhesion between the molded product and the lubricative black paint (sliding agent) is significantly reduced. It was Further, there has been a problem that a CFC-based solvent, which is scheduled to be totally abolished in the future, is used for the cleaning because of environmental problems.

In addition, as a method of manufacturing a composite material laminated plate having fine irregularities, a method of sandblasting the composite material laminated plate can be considered. However, in this method, since sand flying at a high speed collides with the surface of the composite material laminated plate to process it, sandblasting of the composite material laminated plate causes fluffing of fibers contained in the composite material laminated plate. Therefore, there is a problem that the sliding property of the composite material laminated plate is deteriorated.

The present invention has been made in view of the above problems, and it is possible to significantly improve the productivity and the sliding property, and further, to reduce the cost, it is possible to significantly reduce the cost. It aims at providing the manufacturing method of.

[0010]

Therefore, the first aspect of the present invention is to "add a plurality of prepreg sheets obtained by impregnating a fibrous base material with a thermosetting resin, and sandwich the prepreg sheets between heating plates to heat them. In the method for producing a composite laminate having fine irregularities by pressure molding, when performing the heating and pressure molding, at least the surface of the prepreg sheet is previously provided between the pressure plate and the prepreg sheet. A method for producing a composite laminate having fine irregularities, characterized in that the fine irregularities are transferred to the surface of the composite laminate by sandwiching a film having one face having fine irregularities and mold release property (claim 1) ”is provided.

The present invention secondly provides "the manufacturing method according to claim 1 (claim 2), characterized in that the film is a polyolefin resin film". In addition, the present invention thirdly provides "the manufacturing method according to claim 2 (claim 3), wherein the polyolefin-based resin is polyethylene, polypropylene or polymethylpentene".

A fourth aspect of the present invention provides "the manufacturing method according to claim 1 (claim 4), characterized in that the film is a fluororesin film". In the fifth aspect of the present invention, "the fluorine-based resin is polyfluorinated ethylene,
5. A propylene fluoride, a polyethylene propylene fluoride, or a polyvinyl fluoride.
The manufacturing method described in claim 5).

A sixth aspect of the present invention provides "a manufacturing method according to any one of claims 1 to 5 (claim 6), characterized in that the unevenness of the fine unevenness is 0.2 μm or more and 4 μm or less. .

[0014]

In the present invention, when a plurality of prepreg sheets obtained by impregnating a fibrous base material with a thermosetting resin are piled up and sandwiched between pressure plates and heat-pressed, a press plate (press plate) is used. ) 4 and the prepreg sheet 3, at least one surface facing the prepreg sheet 3 has a fine concavo-convex shape (surface) 2 and a film 1 having releasability, so that the fine concavo-convex is formed on the surface of the molded product. Since it is transferred to, a constant fine unevenness is always formed on the surface of the molded product (composite material laminated plate) 5.

Therefore, the press plate (pressurizing plate) 4 does not need to be processed with high-precision ruggedness, and the cost can be greatly reduced. The film 1 having a desired fine uneven shape
Can be obtained comparatively easily by subjecting the film to a matting process (for example, a process of finishing the film surface to a satin surface, that is, a fine uneven surface by a blasting process or a corona discharge process).

Further, at the time of heat and pressure molding, the film 1
Plays a role as a kind of cushion, the surface scratches of the press plate (pressure plate) 4 have a very small effect on the molded product (composite material laminated plate) 5. Therefore, handling of the press plate (pressure plate) 4 (including maintenance)
Becomes much easier, and the workability, that is, the productivity is greatly improved.

Further, since the film 1 has releasability,
No need to apply release agent. Therefore, the step of applying the release agent can be omitted. That is, it is possible to significantly improve productivity and significantly reduce cost. Furthermore, since the release agent does not adhere to the surface of the molded product, it has excellent adhesion to the lubricative black paint (sliding agent), and as a result, a molded product with excellent sliding properties (composite laminate) 5 can be obtained.

The fine uneven surface 2 formed on the surface of the composite laminate according to the present invention has a difference in unevenness of 0.2 μm or more and 4 μm or less (particularly preferably, in consideration of proper sliding property and light reflectance. 0.5 μm or more and 1.5 μm or less) is preferable. In addition, the film 1 according to the present invention,
Polyolefin resin (for example, polypropylene, polyethylene, polymethylpentene [trade name TPX], etc.),
Fluorine-based resin (for example, polyfluorinated ethylene [trade name Teflon], polyfluorinated ethylene propylene, polyfluorinated propylene, polyvinyl fluoride resin [trade name Tedler], etc.), etc. on at least one surface of each film having releasability, It is preferable that the mat treatment is performed in the range of 0.2 μm or more and 4 μm or less (particularly 0.5 μm or more and 1.5 μm or less).

Curing and laminating the prepreg sheet 3,
Considering the optimization of the formation of the fine uneven surface on the laminate, the heating temperature according to the present invention is 70 ° C. or higher and 140 ° C. or higher.
C or less is preferable, and the heating time is preferably 1 hour or more and 2 hours or less. Pressurization pressure is more than 2Kg / cm ² and 10Kg / c
It is preferably m ² or less. The thickness of the composite material laminated plate 5 manufactured according to the present invention is not particularly limited, but when it is used for a shutter blade of a focal plane shutter, it is 50 μm.
As described above, it is preferably 150 μm or less.

The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

[0021]

EXAMPLE A unidirectionally oriented prepreg sheet of carbon fibers (an example of a prepreg sheet according to the present invention) 3 was laminated at 0 ° / 90 ° / 0 °, and this laminate was subjected to centerline average roughness ( Roughness difference) 0.5 μm or more and 1.5 μm or less, sandwiched by a polyvinyl fluoride resin [trade name Tedlar] film (one example of a film according to the present invention, see FIGS. 2 and 3) 1 having one or both surfaces matted, and further , Mirror-like press plate (pressurizing plate) that has not been processed with fine irregularities
Sandwiched by 4 and heat-pressed to form a laminate of the carbon fiber reinforced resin of this embodiment (an example of a composite laminate, thickness 100 μm).
m) 5 was obtained (see FIGS. 1 and 4). Table 1 shows the performance of the laminated plate 5.

The heating temperature is 120 ° C or higher, 140 ° C.
The heating time was 1 hour or more and 2 hours or less, and the pressure was 2 kg / cm ² or more and 10 kg / cm ² or less. on the other hand,
For comparison with this example, unidirectionally oriented carbon fiber prepreg sheets were laminated at 0 ° / 90 ° / 0 ° and the laminate was subjected to precision grinding to obtain a center line average roughness of 0.
It was sandwiched between press plates processed to have a thickness of 5 to 1.5 μm (previously coated with a release agent) and heat-pressed to obtain a carbon fiber reinforced resin laminate of Comparative Example (thickness 100 μm).
The performance of this laminate is shown in Table 1. The heating and pressing conditions are
Same as the embodiment.

As is clear from Table 1, the laminated product of the example has a substantially same physical property value as compared with the laminated product of the comparative example, but the coating process (the coating of the lubricious black paint on the surface of the laminated product).
It was possible to greatly reduce the defective rate in the, and as a result, it was possible to significantly improve the sliding property of the laminated product. Further, in the example, since the step of applying the release agent to the press plate and the step of removing the release agent from the molded product (laminated product) are unnecessary, the productivity is significantly improved as compared with the comparative example. The cost can be reduced significantly.

Although the case where a carbon fiber prepreg sheet is used has been described as an example, the manufacturing method of the present invention is applicable to all fiber-reinforced composite laminates and further to plastic molded articles for finely roughening. It can be applied to all cases where

[0025]

[Table 1]

[0026]

As described above, according to the present invention, the productivity and the sliding property of the composite material laminated plate 5 having fine irregularities can be greatly improved, and the cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing each arrangement of a press plate 4, a film 1 and a prepreg sheet 3 when a prepreg sheet 3 is heated and pressed.

FIG. 2 is a schematic side view of a releasable film 1 having a fine concavo-convex shape (surface) 2 on one surface, which is an example of a film according to the present invention.

FIG. 3 is a schematic side view of a releasable film 1 having fine irregularities (faces) 2 on both sides, which is an example of the film according to the present invention.

FIG. 4 is a schematic side view of a composite laminate 5 having a fine uneven surface 2 produced according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Film having releasability and fine uneven surface 2 ... Fine uneven surface 3 ... Prepreg sheet 4 ... Press plate (pressurizing plate) 5 ... Composite material laminate having fine uneven surface Above the board

Claims (6)

[Claims] 1. A composite laminate having fine irregularities by stacking a plurality of prepreg sheets obtained by impregnating a fibrous base material with a thermosetting resin, sandwiching the prepreg sheets between them, and heat-pressing them. In the method for producing a plate, when performing the heating and pressure molding, at least a prepreg-sheet is previously provided between the pressure plate and the prepreg-sheet.
A method for producing a composite laminate having fine irregularities, characterized in that the fine irregularities are transferred to the surface of the composite laminate by sandwiching a film having one face facing the sheet having fine irregularities and mold releasability. . 2. The manufacturing method according to claim 1, wherein the film is a polyolefin resin film. 3. The method according to claim 2, wherein the polyolefin resin is polyethylene, polypropylene or polymethylpentene. 4. The manufacturing method according to claim 1, wherein the film is a fluororesin film. 5. The method according to claim 4, wherein the fluorine-based resin is polyfluorinated ethylene, polyfluorinated propylene, polyfluorinated ethylene propylene, or polyvinyl fluoride. 6. The unevenness of the fine unevenness is 0.2 μm or more,
The method according to claim 1, wherein the thickness is 4 μm or less.