JPH06270149A - Production of glass fiber preform product - Google Patents

Abstract

PURPOSE:To reduce production equipment cost by dispensing with at least an upper mold when an FRP molded object is produced by a resin injection method and to produce the FRP molded object regardless of simple, general and complicated shapes. CONSTITUTION:A nylon film 19 4s heated by the heat possessed by a glass fiber mat 10 to become stretchable to be closely bonded to the mat 10 to form a mutually superposed laminate. In this state, a molding machine 17 is clamped to subject the laminate 17 to compression molding.

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 glass fiber preform product applicable to a resin injection method, which is one of the methods for producing an FRP molded product.

[0002]

2. Description of the Related Art Conventionally, there are various methods for producing an FRP molded body, and one of them is a resin injection method. In this method, a glass fiber continuous strand mat or a glass fiber chopped strand mat to be a reinforcing material is placed between the upper and lower molding dies, and after positioning by clamping the upper and lower dies, in this state, or Connect the vacuum pump to either the upper or lower mold,
This is a method of injecting an unsaturated polyester resin, a vinyl ester resin, an epoxy resin or the like into a mold and curing it while the mold is evacuated.

[0003]

Compared to the hand layup method and the spray up method, the resin injection method does not require the skill of the operator and is performed by the closed mold method, so that styrene odor is not generated. It is a method characterized by a small number and a good working environment, but it requires a robust and expensive mold, and it also requires peripheral equipment to hold it, which raises the problem of high production equipment costs. Have

However, FR having a shape close to a plane
In the case of producing a P molded body, a film is placed on the surface of the glass fiber continuous strand mat or the glass fiber chopped strand mat placed in the lower mold, and the film is pulled by vacuum to pull the film into the glass fiber continuous strand mat or the glass fiber chopped strand mat. It is possible to use the film as a substitute for the upper mold and reduce the cost of production equipment by using the above method.
The RP molded body is limited to those having an extremely simple shape. That is, when an FRP molded product having a complicated shape is to be produced by this method, the film is more wrinkled, and the resin injected into the film accumulates, causing problems such as a decrease in the mechanical strength of the FRP molded product and a poor appearance. Because.

The present invention has been made in view of the above circumstances, and when an FRP molded body is manufactured by the resin injection method, at least the upper mold is not required, so that the production facility cost can be reduced and only the simple shape can be obtained. It is another object of the present invention to provide a method for producing a glass fiber preform product that enables the production of FRP molded products having general shapes and complicated shapes.

[0006]

That is, the method for producing a glass fiber preform product according to the present invention comprises heating a glass fiber mat having at least a glass fiber continuous strand mat and then laminating a film on one side or both sides thereof. It is characterized in that a laminate is produced and then the laminate is compression molded.

By the way, generally, as a method for producing a glass fiber preform, a direct preform method,
There are two methods, the stamped preform method.

The direct preform method is a method in which glass roving is cut into about 2 inches, sprayed on a mold having a predetermined shape together with a liquid binder, dried and then removed from the mold.

In the stamped preform method, first, a glass fiber continuous strand mat is prepared, heated at a temperature at which the organic binder attached thereto is softened, and then,
It is a method of producing a preform by compression molding into a predetermined shape.This method has a higher production efficiency than the direct preform method, and since continuous production is possible, mass production of glass fiber preforms is possible. Suitable for, the method for producing a glass fiber preform of the present invention,
This stamped preform method is applied.
By the way, a continuous glass fiber strand mat is formed by stacking a large number of spirally twisted glass strands that are continuous and of uniform thickness on a flat surface, and formed into a mat using an organic binder made of a thermoplastic resin. Is.

The glass fiber mat used in the present invention can be produced by laminating one or a plurality of glass fiber continuous strand mats, or by laminating a glass fiber chopped strand mat thereon.
In order to obtain a glass fiber preform product having a predetermined shape without being cut when it is compression-molded, at least a glass fiber continuous strand mat must be provided.

Further, the present invention is characterized in that the film is one kind selected from a nylon film, a PVA film and a polyolefin film.

That is, the film used in the present invention does not pass through the resin injected during the preparation of the FRP molded product, and can be stretched by being heated, and the film can be stretched on the surface of the glass fiber preform even after compression molding. Since it is required to adhere along these lines, nylon-based films, PVA-based films, and polyolefin-based films that satisfy these requirements are suitable.

Further, since this film is heated by the heat possessed by the preheated glass fiber mat, when the thickness thereof is 100 μm or more, the whole film is not sufficiently heated and it is difficult to expand during compression molding. , Thickness is 30μ
If the thickness is less than m, the resin may be damaged at the time of injection. Therefore, the thickness is preferably 30 to 100 μm.

[0014]

According to the method of the present invention, it is possible to continuously produce an FRP molded product having a film attached on one side or both sides, and when this glass fiber preform product is used, a resin injection method is used. When the FRP molded body is manufactured by the above, at least the upper mold is unnecessary.

That is, in the case of using a glass fiber preform product having a film attached to only one side,
Prepare only a robust lower mold, place the glass fiber preform product so that the surface without the film is in contact with the mold, and then inject the resin between the mold and the film, the resin will pass through the film. Therefore, an FRP molded product having a shape that matches the shapes of the molding die and the film can be obtained.

In the case of using a glass fiber preform product having films adhered on both sides, a lower mold made of a relatively inexpensive material having a shape matching the shape of the lower surface of the glass fiber preform product. After placing the glass fiber preform product in this lower mold and injecting a resin between both films, the resin does not pass through the film and the FR has a shape matching the shape of both films.
A P molded body is obtained.

[0017]

EXAMPLES The present invention will be described in detail below based on examples.

FIG. 1 is an explanatory view showing a method for producing a glass fiber preform product of the present invention.

In FIG. 1, two glass fiber continuous strand mats 10a and 10b each having a width of 1400 mm wound into a roll have a basis weight of 450 g / m ² , and the first tension adjusting roller. After being gradually pulled out by the first belt conveyor 13 via 11, 12 and overlapping each other to form the glass fiber mat 10, the glass fiber mat 10 is stopped at a predetermined position, and the cutting blade 14 causes 900
It is cut to a length of mm.

Then, the cut glass fiber mat 1
0 is a heating furnace 16 by the second belt conveyor 15
To the front of the heating furnace 16 and further moved to the inside of the heating furnace 16 by a mat moving device (not shown) having a mechanism for holding and moving the periphery thereof.

The heating furnace 16 is set to an ambient temperature of about 300 ° C., where the glass fiber mat 10 is held for a certain period of time, whereby the organic binder adhering to the surface of the glass fiber is sufficiently softened. .

Further, above the clamp frame 18a under the molding machine 17, a nylon film 19 having a thickness of 50 μm, which is cut to a predetermined size, is arranged in advance, and the heated glass fiber mat 10 moves on the mat. When the molding machine 17 is moved between the upper die 17a and the lower die 17b by a device (not shown), the upper and lower clamp frames 18b and 1b are shaped so as to be mounted around the upper die 17a and the lower die 17b.
8a moves quickly, and the periphery of the glass fiber mat 10 and the nylon film 19 is pinched. At this time, the nylon-based film 19 is heated by the heat of the glass fiber mat 10 so that it can be expanded, and at the same time, the two are brought into close contact with each other to form a laminated body. In this state, the molding machine 17 is clamped. The laminate is compression molded.
After a certain period of time, the upper mold 17a and the lower mold 17b are opened to take out the molded product in the mold, that is, the glass fiber preform product having the nylon film 19 attached to one surface thereof.

Next, a method for producing an FRP molded body using this glass fiber preform will be described with reference to FIG.

First, the glass fiber preform product 20 is placed on a lower mold 21 for FRP molding which is made of an epoxy resin and a filler and has a predetermined shape, with the surface on which the nylon film 19 is not attached facing down. After arranging and pressing the periphery with the rubber pinch 22, the resin injection port 23
And hoses 25 and 26 were attached to the vacuum degassing ports 24, respectively. After that, while drawing air from the vacuum degassing port 24, the unsaturated polyester resin containing the curing agent is injected from the resin injection port 23, and is held in this state for about 30 to 40 minutes, and then the rubber pinch 22 is removed to remove the FRP. A molded body was obtained. Next, this FRP molded body was removed from the FRP molding lower mold 21, and then the nylon film 19 was also removed together with the hoses 25 and 26.

The FRP molded body thus obtained is FRP
It had a shape matching the shapes of the lower mold 21 for molding and the nylon film 19.

[0026]

As described above, when the glass fiber preform product manufactured by the method of the present invention is used, at least the upper mold is not required when manufacturing the FRP molded body by the resin injection method, so that the production equipment cost is reduced. In addition to the simple shape, it is possible to produce not only simple shapes but also FRP molded bodies having general shapes and complicated shapes. Further, according to the method of the present invention, such glass fiber preform products can be continuously manufactured. It becomes possible to do.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for producing a glass fiber preform product of the present invention.

FIG. 2 is an explanatory view showing a method for producing an FRP molded body using the glass fiber preform product of the present invention.

[Explanation of symbols]

 10 glass fiber mat 14 cutting blade 16 heating furnace 17 molding machine 19 nylon film 20 glass fiber preform product 21 lower mold for FRP molding

Claims (2)

[Claims] 1. A glass fiber mat provided with at least a glass fiber continuous strand mat is heated, and then a film is laminated on one or both surfaces of the glass fiber mat to prepare a laminate, and the laminate is then compression molded. Of manufacturing glass fiber preform products. 2. The film is a nylon film, PV
The method for producing a glass fiber preform product according to claim 1, wherein the glass fiber preform product is one type selected from an A-based film and a polyolefin-based film.