JPS63178028A - Manufacture of fiber reinforced synthetic resin molded item - Google Patents

Abstract

PURPOSE:To efficiently produce a molded item uniform is quality by a method wherein synthetic resin foam and fiber reinforcing material are put in the order named onto the outer surface of a main body layer consisting of fiber reinforced synthetic resin so as to be pressed by means of a hydraulic pressurizing vessel. CONSTITUTION:Synthetic resin foam 9 and fiber reinforcing material 10, both of which are cut to desired sizes, are put in the order named onto a main body layer 8 consisting of fiber reinforced synthetic resin and installed just under a hydraulic pressurizing vessel 6. Next, the actuating a hydraulic cylinder 3, the hydraulic pressurizing vessel 6 is lowered together with a hydraulic pressurizing vessel bearer 5 so as to abut the lower end of the side wall of the bearer against the surface 8' of the main body layer 8. At the same time, pressurized air is sent through a fluid pipe 7 in the hydraulic pressurizing vessel 6. as a result, the hydraulic pressurizing vessel 6 expands, resulting in limiting the upper part of the vessel by the inner wall face of the bearer 5 and at the same time pressing the fiber reinforcing material 10 and the foam 9 through the pressing surface 6' of the vessel against the outer surface 8' of the main body layer 8 so as to allow the resin in the foam 9 permeate the fiber reinforcing material 10. Thus, pressurizing force does not fluctuate, resulting in efficiently obtaining a molded item with stable quality.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing a fiber-reinforced synthetic resin molded product.
〇 (Prior art) Regarding the manufacturing method of fiber-reinforced synthetic resin molded products such as bathtubs, waterproof bathtubs, containers, septic tanks, etc., which have excellent strength and insulation properties. Synthetic resin molded products are molded using molding methods such as press molding, hand lay-up molding, and spray-up molding, but these molded products are subjected to a large load on the bottom of the molded product during use, for example, As shown in FIG. 5, after forming the main body layer 8 on the gel coat layer 12, a reinforcing material 13 such as plywood or steel is placed or fixed on the bottom of the molded product, and fiber reinforcement is again applied from above. Usually, the synthetic resin layer 14 is laminated for reinforcement.

(Problems with the Prior Art) However, in the case of the conventional product described above, the main body layer 8 is formed of fiber-reinforced synthetic resin; The surface 8' (back side of the molded product) usually has many irregularities, and the reinforcing material 13 placed or adhesively fixed thereon is.

It is difficult to sit, and many cavities 11 are generated between the main body layer 8 and the reinforcing material 13.
The occurrence of this reduces the reinforcing effect of the reinforcing material 13 and
When an external force is applied to the 0 portion, it becomes flat, resulting in a large quality problem. Moreover, even if the reinforcing material is generally placed on the bottom of the layer 8 and fixed with bolts, or the W&fiber reinforced synthetic resin layer 14 is layered on top of it again, it is done manually. Therefore, there were problems in that a considerable number of man-hours were required, and products of uniform quality could not be obtained, and workability was poor and production efficiency could not be improved.

(Means for Solving the Problems) The uninvented gist for solving the above problems is to form a general layer made of fiber-reinforced synthetic resin using a mold, and to A synthetic resin foam impregnated with a thermosetting resin in advance and a fiber reinforcing material with or without impregnation with a thermosetting resin are layered in this order, and then a soft elastic pressure is applied above the fiber reinforcing material. A fluid pressurized container having a surface is arranged with its pressing surface facing the fiber reinforcement, and then fluid is pumped into the fluid pressurized container, and the fiber reinforcement and the synthetic resin foam are bonded to each other on the pressing surface. The present invention relates to a method for producing a fiber-reinforced synthetic m resin molded product, which is characterized by pressurizing and curing.

(Function) In the uninvented case, the outer surface of the layer is generally coated with a synthetic resin foam impregnated with a thermosetting resin in advance and a fiber reinforcing material with or without a thermosetting resin impregnated in this order. Overlapping,
Next, it is pressurized and cured in a fluid pressurized container, so that the synthetic resin foam and the fiber reinforcement are integrally and stably fixed to the general layer by the resin.

(Example) Fig. 1 shows an example of an apparatus suitable for carrying out the method of the present invention, in which legs 2 are erected at each of the four corners of a top plate l, and a fluid Pressure shilling-3 is provided. As shown in FIG. 2.3, a rectangular parallelepiped fluid pressurized container support 5 with a hole at the bottom is attached to the lower end of the piston rod 4 of the fluid pressure cylinder 3. A bag-shaped fluid pressurizing container 60 made of chloroprene rubber is attached to the periphery of the entrance part of the fluid pressurizing container support 5, and nine fluid inlets and outlets are provided at one place on the upper wall thereof, and one end of the fluid pipe 7 is connected to the periphery of the fluid pressurizing container 60. The other end can be connected to either a compressor or a vacuum pump (not shown). 6 is a lower wall surface of the fluid pressurized container 6, which is a pressing surface.

The fluid pressurized container in the present invention does not necessarily need to be rubbed in a bag-like manner as a whole; for example, 1. The support 5 itself in Figure @2 is used as a container, and a sheet made of a soft elastic material is tightly stretched around the periphery of the bottom opening to serve as a pressing surface, allowing fluid to enter and exit from the top wall of the container. There may be.

To carry out the uninvented method using the described apparatus, first a body 18 of fiber-reinforced synthetic resin is formed. As the method, hand lay-up molding method and spray-up molding method are suitable, and the material thereof is a fiber-reinforced synthetic resin that is commonly used in these molding methods. On the other hand, separately prepare a synthetic resin foam and a fiber reinforcing material. As the synthetic resin foam, various types of open 9L foam can be used, but soft foam is most suitable, especially when the specific gravity is α.
02 to 0.03 is preferred. Examples of the thermosetting resin to be impregnated therein include unsaturated polyester resins, vinyl ester resins, epoxy resins, etc., which are used in the form of liquid or slime. Examples of the fiber reinforcing material include glass fiber mats, roving cloths, continuous strand mats, etc. Even when the material is pre-impregnated with a thermosetting resin, the same kind of material as the synthetic resin foam may be used. And this synthetic tR
The resin foam suspension and the fiber reinforcing material 10 are cut into desired sizes and stacked on the main body layer 8 in this order. Thus roughly M8
It is also installed directly below the fluid pressurized container 6.

At this time, the pressing surface 6 and the fiber reinforcing material 1G must face each other. In addition, the main body PI! 8 may be placed directly under the fluid pressurized container 6 first, and then a synthetic resin foam or the like may be superimposed thereon.

Next, the fluid pressure cylinder 3 is actuated to lower the fluid pressurized container 6 together with the fluid pressurized container support 5 so that the lower end of its side wall is brought into contact with the surface 8' of the main body layer 80, and at the same time, pressure is applied from the first fluid pipe 7. Pressurized air is sent into the fluid pressurized container 6. In this way, the fluid pressurized container 6 expands, and as shown in FIG. The foam 9 is pressurized against the outer surface 8' of the main body layer 8, and even if the fiber reinforcing material 1O is not impregnated with thermosetting resin, this pressurization causes the resin in the synthetic resin foam 9 to Penetrate. The compression ratio of the synthetic resin foam 9 is Q8~α at the initial stage.
The amount of resin impregnated into the resin is preferably about 1.2 at the time of final compression. It is preferable that the capacity is about 50 to 20%. Air pressure Fit~7 to be fed to the fluid pressurized container 6
9/ffl is appropriate. If the fluid is not air, it depends on the physical properties of the fluid.

Once sufficient pressurization is obtained, the pressurized air inside the @body pressurization container 6 is removed, but this can be done by connecting the other end of the fluid pipe 7 to a vacuum pump, or by connecting it to a free state [IK]. It can be done by doing this. Then, the fluid pressure cylinder 3 is operated to raise and restore the fluid pressurized container support 5, and the cycle is completed.

As shown in FIG. 4, the fiber-reinforced synthetic resin molded product manufactured in this manner has the synthetic resin foam 9 compressed and well-fitted to the uneven outer surface 8' of the main body layer 8, so that the fibers can be bonded without leaving any voids. An integral K11li was obtained together with the reinforcing material 10.

(Effects) The method for producing a fiber-reinforced synthetic resin molded product of the present invention includes forming a main body layer, and then applying a synthetic resin foam impregnated with a thermosetting resin in advance to the outer surface of the main body layer, and a synthetic resin foam impregnated with a thermosetting resin in advance. and a fiber reinforcement material impregnated with or not impregnated in this order,
Next, it is pressurized and cured in a fluid pressurized container, so the synthetic resin foam provides insulation to the molded product, absorbs irregularities on the outer surface of the main body layer, prevents the formation of cavities, and hardens itself. Therefore, it shares the reinforcing function and also stabilizes the sitting of the fiber reinforcing material, which is the original reinforcing material layered on top of the main body layer.

In addition, since the synthetic resin foam Kti is pre-impregnated with a thermosetting resin, it will work as one and firmly attach to the outer surface of the main body layer, regardless of the presence or absence of the thermosetting resin in the fiber reinforcement material laminated on top of it. It is laminated and exhibits sufficient reinforcing function.

In addition, since the fluid is pressurized using a pressurized fluid container, work efficiency is improved compared to manual work, and it also has the effect of efficiently obtaining stable quality products without variations due to the pressurizing force and its components. be.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an example of a device preferably used to carry out the manufacturing method of the present invention, together with a used ffi;
Figure 2 is a front sectional view of the same as above, showing the state before pressurization;
Fig. 3 Fi is a diagram showing the state after pressurization of the same as above, Fig. 4 is an enlarged sectional view of the main part of the fiber-reinforced synthetic resin molded product obtained by the manufacturing method of the present invention, and Fig. 5 is a diagram showing the state after pressurization of the same as above. FIG. 3 is an enlarged sectional view of the main part of the molded product.

Claims (1)

[Claims] 1. Form a main body layer made of fiber-reinforced synthetic resin using a molding mold, and impregnate the outer surface of the main body layer with a synthetic resin foam that has been pre-impregnated with a thermosetting resin and a thermosetting resin. or a non-impregnated fiber reinforcing material are stacked in this order, and then a fluid pressurized container having a flexible and elastic pressing surface is placed above the fiber reinforcing material with its pressing surface facing the fiber reinforcing material,
A method for manufacturing a fiber-reinforced synthetic resin molded product, which comprises then pressurizing and curing the fiber reinforcing material and the synthetic resin foam on the pressing surface of the fluid by pumping the fluid into a fluid pressurizing container.