JPH0516251A - Manufacture of fiber-reinforced plastic molded form - Google Patents

Abstract

PURPOSE:To impregnate a fiber-reinforced material with a resin, to omit defoaming work conducting defoaming by using a defoaming roll and to save labor improve productivity by impregnating the fiber-reinforced material with a resin composition and defoaming the fiberreinforced material by utilizing a decompressed state. CONSTITUTION:The top face of a mold 1 under a decompressed state is supplied with a glass roving 10 while the glass roving 11 is cut in glass chops 11 in approximately 50mm by cutters 6. The cut glass chops 11 are held on the top face of the mold because the internal surface of the mold 1 is brought to a decompressed sucked state. The upper sections of the glass chops 11 are supplied with a resin liquid 12 as a resin composition 14, in which the resin liquid 12 is mixed by a spray gun 7 together with a curing agent 13. The resin composition 14 fed is permeated toward the internal surface of the mold 1 under the decompressed state while being impregnated with a fiber-reinforced material and being defoamed, thus allowing defoaming in a short time.

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 fiber reinforced plastic molded product.

[0002]

2. Description of the Related Art Fiber reinforced plastics (hereinafter abbreviated as FRP), which is a composite of glass fiber reinforced material and unsaturated polyester resin, are widely used in housing materials, boats, industrial equipment, electric parts, automobile parts, etc. It has become an essential material for daily life. As a molding method for producing an FRP product, there are a manual method such as a hand lay-up method and a spray-up method, and a mechanical molding method such as an SMC method, a FW method and a continuous method.

[0003]

In the hand lay-up method, glass fiber and polyester resin are manually laminated on the surface of the mold, and the glass fiber is impregnated with the polyester resin, defoamed and then cured, and then cured from the mold. The product is extracted to obtain a molded product. In the spray-up method, the glass roving is cut using a spray-up machine and sprayed onto the surface of the mold together with the polyester resin, and then defoaming roll is used to manually defoam and cure, and the cured product is extracted from the mold. Get the goods. Both of the hand lay-up method and the spray-up method require defoaming work using a defoaming roll. This defoaming work requires considerable labor, and if this defoaming work is not sufficient, a satisfactory molded product cannot be obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention reduces the defoaming work process in the hand lay-up method, spray-up method and the like, and de-foams when molding an FRP molded product by the hand-lay-up method, spray-up method or the like. It is intended to provide a method for manufacturing an FRP molded product that eliminates the work.

According to the present invention, one side of a mold having a large number of small holes is kept in a decompressed state, air is sucked from the small holes, and the surface of the mold in contact with the atmosphere is covered with a fiber reinforcing material or is fiber reinforced. The present invention relates to a method for producing an FRP molded product in which a resin composition is sprayed or sprayed in a state where the material is sucked into a mold to impregnate the resin composition into a fiber reinforced material and then cured.

In the present invention, one side of a mold having a large number of small holes is kept in a depressurized state, air is sucked from the small holes, and the surface of the mold in contact with the atmosphere is covered with a fiber reinforcing material, or the fiber is The resin composition is sprayed or sprayed while the reinforcing material is sucked onto the mold. Since one side of the mold is in a reduced pressure state, the resin composition sprayed or sprinkled is automatically impregnated and defoamed into the fiber reinforcement, and then cured. As described above, in order to impregnate and defoam the resin composition into the fiber reinforcement by utilizing the reduced pressure state, the conventional hand lay-up method, the spray-up method, etc., the fiber reinforcement is impregnated with the resin composition,
The defoaming work of defoaming using a defoaming roll can be omitted.

The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. Here, 1 is a mold having a large number of small holes 2, 3 is a depressurizing device for keeping the mold 1 in a depressurized state, 7 is a spray gun, 10 is glass roving which is a kind of fiber reinforcement, and 12 is a resin liquid. ,
Reference numeral 13 represents a curing agent. 6 is glass roving 10 50
It is a cutter for cutting into glass chops 11 of about mm. The molding die 1 used in the present invention has a predetermined shape to be molded, and the aperture ratio of the small holes 2 is about 50%, and punching metal or FRP can be preferably used. A general suction fan can be used as the decompression device 3. Reference numeral 5 is a pressure gauge for measuring the reduced pressure state. To absorb and hold the fiber reinforcement or resin supplied to the mold surface, and to impregnate and defoam the resin, one surface of the mold is 100 to 4
It is preferable to maintain a reduced pressure state of about 00 mmHg. 1
If it is less than 00 mHg, suction and retention are insufficient, and 40
If it exceeds 0 mHg, it may be sucked too much, and the resin may enter the inside of the mold through the small holes when the resin is supplied. Since the amount of atmospheric air to be sucked is proportional to the surface area of the mold, the pressure reducing damper 4 should be used in order to maintain an optimal pressure reduction state.
Is installed on the suction fan.

Next, the materials used in the present invention will be described. As the fiber reinforcing material used in the present invention, glass fiber, carbon fiber, aramid fiber or the like is used, and there is no particular limitation. Further, the fiber reinforcing material can be used in any state such as mat, cloth, continuous fiber or roving. Examples of the resin used in the present invention include thermosetting resins such as unsaturated polyester resin and epoxy resin.
To these resins, an accelerator, a curing agent, and if necessary, a filler, a coloring agent, a thixotropic agent, etc. are used. The resin composition used in the present invention needs to have appropriate viscosity, thixotropy and curability. The viscosity of the resin composition is preferably 10 poise or less. If the viscosity is too high, the impregnation of the resin into the fiber reinforcement will be poor, and it will be difficult to degas only by the decompression force. A molded product having a vertical surface has a degree of fluctuation of 1 to 5 (25 ° C, BL to prevent dropping of the resin from the vertical surface).
It is preferable to use a resin composition having a mold, 6/60 rpm). As for curing, any of room temperature curing type, medium temperature curing type and high temperature curing type can be applied. Hand layup method,
As in the spray-up method and the like, a room temperature-curing type is generally used in which a room-temperature curing type curing agent is added and used.

Next, a method of supplying the fiber reinforcement and the resin to the upper surface of the mold will be described with reference to FIG. In the present invention, first, the fiber reinforcement is supplied to the upper surface of the mold 1 in a reduced pressure state.
In the example of FIG. 1, glass roving is used as a fiber reinforcement, and the glass roving 10 is cut into glass chops 11 of about 50 mm by a cutter 6 installed above the mold 1 and supplied to the upper surface of the mold 1. 50 mm
The glass chop 11 cut to some extent is held on the upper surface of the mold because the inner surface of the mold 1 is in a vacuum suction state.
The glass roving may be cut to an appropriate length, or may be continuously supplied without being cut. Instead of roving, chopped strand mat, continuous mat, glass cloth, roving cloth, or the like may be supplied to the upper surface of the mold. It is also possible to use these materials in combination. Next, the method of supplying the resin composition will be described. The resin liquid 12 is supplied onto the glass chop 11 as the resin composition 14 mixed with the curing agent 13 by the spray gun 7. In FIG. 1, the resin composition is sprayed and supplied by using a spray gun, but the resin may be supplied by using a mohair roll used in the hand layup method, or these may be combined. In the present invention, since the supplied resin composition penetrates into the mold in a depressurized state while being impregnated and defoamed into the fiber reinforcement, the fiber reinforcement is first supplied to the mold, and then the resin composition is fiber-reinforced. In principle, it is supplied onto the material, but this may be repeated, or the fiber reinforced material and the resin composition may be supplied simultaneously. To supply while cutting the glass roving of the fiber reinforcement and further to spray-supply the resin composition, the spray-up machine used in the spray-up method can be used as it is.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The specific specifications of the equipment and materials of FIG. 1 were implemented as follows. 1. Equipment specifications (1) Type: dimensions Width x length x height = 1000 x 1000
× 1000mm: Material Punched metal: Open area ratio 50%: Surface area approx. 5m ² (2) Pressure reducing device (exhaust fan): Exhaust capacity 200m ³ / min (3) Supply device for resin and fiber reinforced material Fig. 1 The supply portion of the resin composition and the fiber reinforcement was carried out using a spray-up machine. Spray up machine: manufactured by Togiken Co., Ltd.

2. Materials used (1) Fiber reinforced material Glass roving: RS-240F-114AJ (manufactured by Nitto Boseki Co., Ltd.) (2) Unsaturated polyester resin: Polyset 5595A
PT-S (manufactured by Hitachi Chemical Co., Ltd.) (3) Hardener: Permec N (manufactured by NOF Corporation)

3. Molding method Fluorine-based release agent (Frecoat FRP: HYS
OL AEROSPACE & INDUSTRIA
L PRODUCTS DIVISION) is applied and mold release processing is performed. Next, the decompression device was operated to adjust the decompression adjusting damper to 250 mmHg. Next, about 12 kg was uniformly sprayed onto the surface of the mold while the glass roving was cut into 50 mm by using a spray-up machine (the discharge capacity of the glass chop was adjusted to 3 kg / min). Next, using a spray-up machine, the resin liquid was mixed with the curing agent and sprayed onto the glass chops on the mold surface (spraying amount: 24 kg, curing agent mixing ratio: 1.0% by weight, composition discharge amount: approx. The spray-up machine was adjusted to 6 kg / min). Approximately 5 minutes after spraying the resin composition, the glass chop was impregnated with the resin composition and became in a defoamed state. At this point, set the decompression adjustment damper to 50
It was adjusted to mmHg. Further, after standing at room temperature for 5 minutes, curing of the resin started. The operation of the exhaust fan of the decompression device was stopped when the resin was completely cured. Further, it is left at room temperature for 20 minutes to cure and release, and then the FRP molded product shown in FIG. 2 (thickness is about 4.
6 mm, the unit of numbers is mm).

[0014]

In the method for producing an FRP molded product of the present invention, the fiber reinforced material is impregnated and degassed by utilizing the reduced pressure state. Therefore, the conventional hand layup method, spray up method or the like is used. It is possible to omit the defoaming work of impregnating the fiber reinforcement with a resin and defoaming it using a defoaming roll. Also, since defoaming can be done in a short time, it is possible to use a resin with a short curing time of the resin, the time until demolding can be shortened, and labor saving and productivity are improved as compared with the conventional handlay method, spray up method, etc. Can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a schematic view of a molded product obtained in an example of the present invention.

[Explanation of symbols]

 1 Mold 2 Small hole 3 Pressure reducing device 4 Pressure reducing adjustment damper 5 Pressure gauge 6 Cutter 7 Spray gun 10 Glass roving 11 Glass chop 12 Resin liquid 13 Curing agent 14 Resin composition

Claims (1)

Claim: What is claimed is: 1. One side of a mold having a large number of small holes is kept in a depressurized state, and while sucking air from the small holes, the surface of the mold which is in contact with the atmosphere is covered with a fiber reinforced material. A method for producing a fiber-reinforced plastic molded article, which comprises spraying or spraying a resin composition while impregnating the fiber reinforcement with a mold and impregnating the resin composition with the resin composition to cure the resin composition.