JPH03106943A - Photocurable prepreg sheet - Google Patents

Abstract

PURPOSE:To obtain a photocurable prepreg sheet which can be easily held at its ends with clamps or the like and can be fed to a molding apparatus such as a shaping die by coating the surfaces of a prepreg sheet with two thermoplastic resin films so that at least either of the films may have a thickness above a specified value and a tensile modulus above a specified value. CONSTITUTION:A photocurable prepreg sheet prepared by coating the surfaces of a prepreg sheet, prepared by impregnating a fibrous reinforcement with a photocurable unsaturated polyester resin solution, with two thermoplastic resin films, wherein at least either thermoplastic resin film has a thickness >=100mum and a tensile modulus >=2X10<4>kg/cm<2>. The entire sheet has a high modulus, so that this photocurable prepreg sheet can be easily held at its ends with clamps or the like and can be smoothly fed to a molding apparatus such as a shaping die or a cooling zone. Unlike prior art, a high-quality composite molding can be obtained without the necessity for an additional end-curing step.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a photocurable brypreg sheet used for manufacturing composite bodies such as rain gutters. (Prior Art) Prepreg sheets, which are made by impregnating glass fiber material with a photocurable unsaturated polyester resin liquid, are widely used in the production of various composite objects. An example of this type of prepreg sheet is PALAPRBG LHZ (manufactured by BASF). In such prepreg sheets, the resin is in an uncured state, and a polyvinyl alcohol film is coated on both sides to prevent the resin from flowing out and the monomer from evaporating, and to eliminate stickiness on the surface and improve handling workability. A protective film that is flexible and generally has a thickness of about 40 to 80 μm is attached. Then, the prepreg sheet is heated and softened with the protective film still attached, and then formed into a desired shape using a forming mold such as a forming roll.The sheet is irradiated with light to harden the resin, and then the protective film is removed. Various composite structures such as rain gutters are manufactured either by peeling or without peeling. In this case, the uncured prepreg sheet covered with the protective film is held by clamps or the like at both ends or the four circumferential edges and is supplied to the shaping mold or the curing zone. It is so soft that it is difficult to grasp the end with a clamp, etc. For this reason, for example, Japanese Patent Application Laid-open No. 19432/1983 proposes a technique in which only the ends of the prepreg sheet to be gripped are hardened in advance to make them easier to grip with a clamp or the like. (Problem to be Solved by the Invention) However, in the above-mentioned conventional technology, a new method is required to pre-cure only the gripped end of the prepreg sheet before supplying it to the shaping mold or curing zone. The disadvantage is that the edge hardening process increases, which is disadvantageous in terms of productivity, equipment costs, etc. The present invention is intended to solve the above-mentioned drawbacks, and its purpose is to easily grasp it with a clamp or the like to form a forming mold, a hardening zone, etc. without adding a new edge hardening process. The purpose of this invention is to provide a photocurable prepreg sheet that can be supplied to molding equipment. (Means for Solving the Problems) The photocurable prepreg sheet of the present invention is made by impregnating a reinforcing fiber material with a photocurable unsaturated polyester resin liquid, and a thermoplastic resin film is adhered to both sides of the prepreg sheet. A photocurable prepreg sheet, characterized in that at least one thermoplastic resin film has a thickness of 100 μ or more and a tensile modulus of 2 x lO'kg/cj or more, thereby achieving the above purpose. It will be done. below,
The present invention will be explained with reference to the drawings. In FIG. 1, 11 is a prepreg sheet, 12 and l
3 is a thermoplastic resin film, films 12 and 1
3 is adhered to both sides of one prepreg sheet. The thickness of the prepreg sheet 11 is generally about 1 to 6 mm, and it is made by impregnating a reinforcing fiber material with a photocurable unsaturated polyester resin liquid, and the resin is in an uncured state and is flexible, and its surface is It is sticky. Films 12 and 13 are applied to both sides of the prepreg sheet 11 by utilizing this adhesive property. As the reinforcing fiber material, a light-transmitting and strong glass SaW non-woven fabric or woven fabric is generally used, but other reinforcing fibers that do not inhibit light transmission and are strong can also be used. In addition, the photocurable unsaturated polyester resin liquid is a commonly used liquid unsaturated polyester resin mixed with a crosslinking monomer such as styrene and 2,2-dimethoxy-2-
It is a liquid compound containing a photocuring agent such as phenylacetophenone. In addition, a thermosetting agent that can be cured by heating at a relatively low temperature may be used in combination with the above-mentioned photocuring agent. In addition, as the prepreg sheet 11, the above-mentioned BAS
A prepreg sheet made by Company F (7) PALAPREG LHZ with the protective film removed can also be used. As one film l3, a thermoplastic resin film having a thickness of 100 μ or more and a tensile modulus of 2×10 4 kg/cm 2 or more is used. As such a film l3, for example, a film made of polyethylene terephthalate resin (generally called PET) or polycarbonate resin and having a thickness of about 100 to 200 μm is suitably used. Further, as the other film l2, a conventionally used polyvinyl alcohol film or polyethylene film having a thickness of about 40 to 80 μm is suitably used.
Such polyvinyl alcohol films and polyethylene films have a tensile modulus of less than 2 x 10' kg/cii and are flexible. In addition, the tensile modulus is ASTM D
-638. Of the films 12 and 13, at least the film on the side to which light is irradiated is naturally a film with good light transmittance, such as a transparent film. In this way, the photocurable prepreg sheet 10 of the present invention is constructed. In order to manufacture a composite shaped body using the photocurable prepreg sheet 10 of the present invention, for example, in the method detailed in JP-A-62-19432 cited as the prior art, only the edge curing step is required. The method that excludes this is preferable. Note that instead of holding it with a clamp, it may be held with a suitable holder. Furthermore, although the above publication describes in detail the case of continuously manufacturing long rain gutters, it is also possible to manufacture various composite gutter bodies in a batch manner using the vacuum molding method or the pressure forming method. ．． In this case, nonwoven fabric, woven fabric, leather, foam sheet, etc. may be laminated and integrated on the photocurable prepreg sheet 10. In the manufactured composite body, there are cases in which the film 12 or 13 is integrally adhered to the prepreg sheet 11, and cases in which it is removable. If it is peelable, the film 12 or 13 is peeled off to form the final product. (Function) In the present invention, the thermoplastic resin film attached to at least one side of the prepreg sheet has a thickness of 100 mm.
μ or more, the tensile modulus is 2×10'kg/c or more, and its rigidity is high. Therefore, the photocurable prepreg sheet of the present invention has high rigidity as a whole, and can be easily grasped or held with a clamp or holder, and smoothly supplied to shaping equipment such as a shaping mold or a curing zone. This makes it possible. (Example) Examples of the present invention will be shown below. 100 parts by weight of unsaturated polyester resin liquid (#2064: manufactured by Showa Kobunshi Co., Ltd.), a photocuring agent (Irgacure #65)
1: manufactured by Nippon Ciba Geigy) and 1.5 parts by weight of a thickener (magnesium oxide) were mixed to prepare a photocurable unsaturated polyester resin liquid. A reinforcing fiber material made of glass fiber strand mat #450 was impregnated with this photocurable unsaturated polyester resin liquid to form a material with a width of about 300 wm, a thickness of about 1 mm, and a glass fiber content as shown in Fig. 1. A prepreg sheet 11 containing approximately 30% by weight was produced. Next, this prepreg sheet 11
Thickness 120μ on one side, tensile modulus 2.8 x 104kg
/cm2 transparent polyethylene terephthalate film CPET film H3, and the other side of the prepreg sheet 11 was coated with a thickness of 60u and a tensile modulus of 0. IX10'kg/d
A transparent polyvinyl alcohol film 12 was adhered by being lightly pressed with a roll to produce a photocurable blob resin film 10 shown in FIG. After this photocurable prepreg sheet 10 is passed through a feed roll 20 as shown in FIG. 2, its both ends are held by clamps 60 and sent to a preheater af30 where it is heated and softened to about 100°C, and then It is formed into an inverted U-shape with a forming roll 40, and then sent to a light irradiation device 50 where IOC
The resin was cured by irradiating it with a 400H ultraviolet lamp for about 2 minutes from a distance of I. Thereafter, this cured composite shaped body (10°) was taken off by a pulling device (not shown), and the films 12 and 13 were peeled off to produce a long rain gutter composite shaped body. In the manufacturing process of this rain gutter composite shape, the photocurable prepreg sheet 10 is easily and securely gripped and transferred by the clamp 60, and the rain gutter composite shape has satisfactory quality without causing lateral displacement. Met. (Effects of the Invention) As described above, in the photocurable prepreg sheet of the present invention, at least one of the thermoplastic resin films adhered to both surfaces of the prepreg sheet has a thickness of 100μ or more and a tensile elasticity. Rate is 2 x 10'kg
/cj or more, and the sheet as a whole has high rigidity. Therefore, the photocurable prepreg sheet of the present invention can be easily gripped or held at its edge with a clamp or holder, and smoothly supplied to a shaping device such as a shaping mold or a curing zone. ．． Therefore, it is possible to obtain a composite shaped body of satisfactory quality without lateral slippage without adding a new edge hardening process as in the conventional technique, and the productivity is improved compared to the conventional technique, and the equipment cost is low. It has the advantage of being .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a photocurable prepreg sheet of the present invention, and FIG. 2 is an explanatory diagram showing an example of a method for manufacturing a composite pre-shaped body from the photocurable prepreg sheet of the present invention. DESCRIPTION OF SYMBOLS 10... Photocurable prepreg sheet, 11... Prepreg sheet, 12, l3... Thermoplastic resin film, 20... Feed roll, 30... Preheating device, 40...
...Four ξ roll, 50...Preliminary irradiation device, 60
...Clamp, 10゛...Hardened composite precept form.

Claims (1)

[Claims] 1. A photocurable prepreg sheet in which thermoplastic resin films are adhered to both sides of a prepreg sheet formed by impregnating a reinforcing fiber material with a photocurable unsaturated polyester resin liquid, wherein at least one thermoplastic resin film is Thickness is 10
0 μ or more and tensile modulus of 2 x 10^4 kg/cm^
2 or more.