JPH04138216A - Manufacture of prepreg - Google Patents

Abstract

PURPOSE:To obtain a light-weight prepreg capable of being shaped by a simple shaping means by removing the excess resin component of a mat excessively supplied with a UV curing resin component and covering the mat with a sheet- shaped article such as a film, paper, etc. CONSTITUTION:A mat 1 composed of rolled glass fibers having a high void is dipped in a UV curing resin component 3 introduced into a tank 2. The mat 1 is passed between pinch rolls 4, 4, and the excess resin component 3 is removed. Consequently, a mat 1, in which the resin component 3 is attached to the peripheries and crossed sections of the fibers of the mat 1 consisting of glass fibers and which has the high void, is manufactured. Sheet-shaped articles 5, 5 such as a film, paper, etc., are attached on both the surface and the rear of the mat 1 and wound, thus manufacturing a prepreg 6. Accordingly, the prepreg 6 manufactured can be shaped by a simple shaping means such as vacuum molding, simple press molding or the like, and irradiated by a UV lamp under the shaped state, thus curing the prepreg 6 in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing prepreg, and more particularly to a method for manufacturing a curable and lightweight prepreg.

(Prior art) As a conventional prepreg manufacturing method, Japanese Patent Application Laid-Open No. 1-31
There is one disclosed in Japanese Patent No. 4769.

In the manufacturing method disclosed in JP-A-1-314769, a mat-like material made of inorganic fibers and a thermoplastic resin is heated and compressed with a roll or the like through an endless belt, and at the exit of the mat-like material, the endless belt is coated with a mat-like material. This involves depressurizing the adhesive, increasing the thickness, and then cooling and peeling it off.

(Problems to be Solved by the Invention) However, the prepreg obtained by the manufacturing method disclosed in JP-A-1314769 has poor heat resistance because it uses a thermoplastic resin, and for example, it is difficult to mold this prepreg as a ceiling material. As a material, there is a demand for prepreg that can be shaped easily and at low cost.

An object of the present invention is to solve the above-mentioned conventional problems.

That is, an object of the present invention is to provide a prepreg manufacturing method that can be shaped by a simple shaping means such as vacuum forming or simple press molding, and can obtain a lightweight prepreg.

(Means for Solving the Problems) In order to solve the above problems, the present invention supplies a mat made of inorganic fibers with a high porosity with an excessive amount of an ultraviolet curable resin component, and passes this mat through a squeezing roll. After removing the excess resin component, the mat was covered with a sheet-like material such as film or paper on either the front or back surface.

(Function) Therefore, the prepreg obtained as above is
For example, it is possible to shape by a simple shaping means such as vacuum forming or simple press molding.

Then, in this shaped state, it can be cured in a short time by irradiating it with an ultraviolet lamp.

Also, the apparent specific gravity is approximately 0. It is possible to obtain a lightweight molded product with a weight of less than 5, and even less than about 0.24.

For example, when the porosity is set to about 66%, an apparent specific gravity of 0.6 is obtained, and when the porosity is set to 87%, an apparent specific gravity of about 0.6 is obtained. 5, but the rigidity is such that the apparent specific gravity is 0.5 or less (for example, bending strength 40 kg/cff1
above), it will be very useful in practical terms.

(Example) Hereinafter, a prepreg manufacturing method according to the present invention will be described based on drawings showing embodiments thereof.

FIG. 1 is a schematic front view showing an example of a manufacturing apparatus used to carry out the prepreg manufacturing method according to the present invention, and FIG. 2 is a longitudinal sectional view of the prepreg manufactured by the manufacturing method of the present invention.

The prepreg manufacturing method of the present invention will be explained based on FIG. 1.

A mat 1 made of rolled glass fiber with high porosity is immersed in an ultraviolet curable resin component 3 placed in a tank 2.

Next, the mat 1 is passed between squeezing rolls 4 to remove excess resin component 3.

In this way, a mat 1 made of glass fibers with a high porosity in which the resin component 3 is attached to the periphery and intersecting portions of the fibers of the mat 1 is produced.

Thereafter, a sheet-like material 5.5 such as a film or paper is attached to both the front and back surfaces of the mat 10 and rolled up to produce a prepreg 6.

Incidentally, reference numerals 7, . . . are rollers for guiding and transporting the mat 1, and reference numerals 8.8 and 8 are rollers for transporting and adhering the sheet-like material 5.5.

In this embodiment, the prepreg 6 is wound up, but the prepreg 6 may be formed into a sheet.

Further, as a method for adhering the resin component 3 to the mat 1 made of glass fiber with a high porosity, in addition to the above-mentioned dipping method, there is also a method of spraying.

As a material made of glass fiber with high porosity,
Continuous strand mat manufactured by Asahi Fiberglass Co., Ltd. was used.

As the ultraviolet curable resin component 3, for example, unsaturated polyester #2064 manufactured by Showa Kobunshi Co., Ltd.
A mixture of 0.5 parts by weight of a photocuring agent Irgacure #651 manufactured by Nippon Chiha Geigy Co., Ltd. and 10 parts by weight of styrene monomer was used.

The prepreg 6 manufactured in this way has the following characteristics.

That is, it can be shaped by a simple shaping means such as vacuum forming or simple press forming.

Then, by irradiating this shaped state with an ultraviolet lamp, it can be cured in a short time.

Furthermore, a lightweight prepreg with an apparent specific gravity of about 0.24 or less can be obtained, and therefore a lightweight molded product can be obtained.

(Effects of the Invention) As explained above, the present invention supplies an excessive amount of an ultraviolet curable resin component to a mat made of inorganic fibers with high porosity, and passes this mat through a squeezing roll to remove the excess resin component. After removal, the front and back surfaces or either one of the surfaces of the mat is covered with a sheet-like material such as a film or paper, so that the following effects are achieved.

That is, the prepreg manufactured by the above manufacturing method can be shaped by a simple shaping means such as vacuum forming or simple press forming.

Then, by irradiating this shaped state with an ultraviolet lamp, it can be cured in a short time.

Furthermore, the apparent specific gravity is 0. It is possible to obtain a lightweight molded article with a particle size of 5 or less, and further, a weight of about 0.24 or less.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing an example of a manufacturing apparatus used for carrying out the prepreg manufacturing method according to the present invention;
FIG. 2 is a cross-sectional view of a prepreg manufactured by the manufacturing method of the present invention. 1... Mat 3... UV curable resin component 4... Squeezing roll 5... Sheet-like material 6... Prepreg patent applicant Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Kaoru: Y' , 2 t'4

Claims (1)

[Claims] 1) After supplying an excessive amount of ultraviolet curable resin component to a mat made of inorganic fibers with high porosity and removing the excess resin component by passing this mat through a squeezing roll, A method for producing prepreg, which comprises covering the surface of the prepreg with a sheet-like material such as film or paper.