JPH0345940Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention aims to efficiently obtain glass fiber-containing unsaturated polyester resin molded products by irradiating and curing ultraviolet rays while molded into a desired shape. Regarding UV-curable FRP sheets.

(Prior art) Recently, as a new type of molding material, two colorless sheets are used to cover both sides of an uncured glass fiber-containing unsaturated polyester resin layer (hereinafter referred to as FRP layer) that can be cured by ultraviolet irradiation. A UV-curable FRP sheet coated with a transparent polyvinyl alcohol resin film (hereinafter referred to as PVA film) has been developed.

This sheet is convenient because it can be molded into a desired shape using a vacuum forming machine, for example, and then irradiated with ultraviolet rays in that state, the FRP layer will quickly harden and the desired molded product can be obtained. but,
As described below, there is a problem in that it is difficult to color.

(Problem to be solved by the invention) In other words, as a method for coloring such an ultraviolet curable FRP sheet, two sheets of PVA covering the FRP layer are used.
There are two possible methods: one in which one of the films is a colored opaque PVA film containing a colorant, and the other in which the FRP layer itself is colored by containing a colorant in the FRP layer. Therefore, when the FRP layer is cured, the releasability of the PVA film from the FRP layer increases significantly, so that both the colorless transparent PVA film and the colored opaque PVA film are easily peeled off. Therefore, with the latter method, it is necessary to color the FRP layer itself by adding a colorant to the FRP layer. However, when a colorant is added to the FRP layer in this way, the ultraviolet transmittance decreases. It takes a long time to cure, making it difficult to obtain molded products efficiently.Also, if a large amount of colorant is added to make the product opaque, ultraviolet rays will be blocked, making it difficult to cure, so there is the problem that it cannot be colored opaquely. be.

The present invention aims to solve these problems.

(Means for solving the problem) To this end, the ultraviolet curable FRP sheet of the present invention has an F′RP layer, that is, an uncured glass fiber-containing unsaturated polyester resin layer that can be cured by ultraviolet irradiation. One side is covered with a UV-transparent film, and the FRP
The opposite side of the layer is covered with a colored opaque acrylic resin film that adheres to the FRP layer when the FRP layer is cured.

(Functions and Effects) In the case of an ultraviolet curable FRP sheet having such a structure, one side of the FRP layer is covered with an ultraviolet transmitting film and the FRP layer does not contain a colorant.
If ultraviolet rays are irradiated through this ultraviolet transmitting membrane,
To efficiently obtain a beautiful colored molded product in which an FRP layer can be rapidly cured, and since the colored opaque acrylic resin film is irremovably adhered to the FRP layer when the FRP layer is cured, there is no risk of decolorization due to peeling. I can do it. Furthermore, if one side of the resulting molded product is covered and protected with a colored opaque acrylic resin film, the acrylic resin film has excellent weather resistance, so the FRP layer deteriorates in a short period of time, and the glass fibers are exposed to the surface. This also has the advantage of improving the weather resistance and aesthetics of the molded product.

Hereinafter, the present invention will be described in detail with reference to Examples.

(Example) Fig. 1 is an enlarged end sectional view showing an example of an ultraviolet curable FRP sheet of the present invention, where 1 is an uncured FRP layer, and one side of this FRP layer 1 is exposed to ultraviolet rays. It is covered with a transparent film 2, and the opposite side is covered with a colored opaque acrylic resin film 3.

The FRP layer 1 is mainly composed of unsaturated polyester resin, which is blended with glass fiber, an ultraviolet curing agent (e.g. disulfide curing agent), a diluent (e.g. styrene), etc. In this state, the surface is sticky and sticky, and is soft and deformable; however, when irradiated with ultraviolet light, the ultraviolet curing agent becomes sensitized and quickly hardens to become a tough cured product. Such FRP layer 1
For example, the same FRP layer as in conventional UV-curable FRP sheets is used.
PALAPREG LHZ (UV curing type manufactured by BASF)
The FRP layer in FRP sheet (trade name) is suitably employed.

The ultraviolet transmitting film 2 covering one side of this FRP layer 1 is
This is provided to eliminate the stickiness of the FRP layer 1 and improve handling, and is attached using the adhesiveness of the FRP layer 1. As the ultraviolet transmitting film 2, various conventionally known transparent synthetic resin films (colorless and transparent or colored and transparent) capable of transmitting ultraviolet rays can be used, and they may be bonded to the FRP layer 1 or not bonded to the FRP layer 1. However, it is preferable to use a transparent acrylic resin film, etc., which has good weather resistance and can be bonded to the FRP layer. When such an acrylic resin film or the like is used, one side of the FRP layer 1 of the resulting molded product is protected by the film adhered to it, so the FRP layer 1 may yellow due to sunlight or glass fibers may come out. This is because weather resistance and the like are improved.

On the other hand, the colored opaque acrylic resin film 3 covering the opposite side of the FRP layer 1 is provided for coloring, and is irremovably adhered to the FRP layer 1 when the FRP layer 1 is cured. As the colored opaque acrylic resin film 3, for example, a colored opaque acrylic resin film mixed with a coloring agent such as a pigment or dye to block approximately 90% or more of ultraviolet rays is suitably used. A material colored with a pattern is also suitably used.

Such a colored opaque acrylic resin film 3 is
It is attached using the adhesiveness of FRP layer 1,
Although the FRP layer 1 is peelable in an uncured state, when the FRP layer 1 is cured by ultraviolet rays, it is irremovably adhered. Although the mechanism of this adhesion is not clear, the colored opaque acrylic resin film 3 described above
Since the FRP layer 1 has the property of being soluble in the diluent such as styrene, the contact surface of the acrylic resin film 3 melts and soaks in the diluent that gushes out onto the surface of the FRP layer 1, causing the FRP layer 1 to harden. It is thought that this causes an irremovable adhesion.

To explain how to use the ultraviolet curable FRP sheet with the above structure, taking as an example a case where a rain gutter with a U-shaped cross section is manufactured, as shown in Fig. 3, a vacuum forming machine 4 etc. is used. The ultraviolet-transmissive film 2 is formed into a U-shaped cross section using
irradiate the FRP layer 1 with ultraviolet rays using an ultraviolet lamp 5 or the like through the ultraviolet transmitting film 2 to harden the FRP layer 1;
If the mold is then demolded, the desired rain gutter made of unsaturated polyester resin containing glass fibers can be obtained. In this case, it is preferable to use an ultraviolet lamp that emits ultraviolet light with a wavelength of 365 to 400 nm, and the irradiation time should be 5 to 6 mm or less since the FRP layer 1 does not contain a colorant. If so, a few minutes is sufficient. Further, as the molding machine, in addition to the vacuum molding machine 4 illustrated, a pressure molding machine, a press molding machine, etc. can also be used.

The molded product (here, a rain gutter) obtained in this way is
In some cases, the ultraviolet transmitting film 2 on the inner surface is peeled off, but the outer surface is covered with a colored opaque acrylic resin film 3 that is irremovably adhered to the FRP layer 1 and is beautifully colored, so that decolorization due to peeling is not possible. There is no fear at all. Furthermore, if the outer surface of the molded product is protected by being covered with the above-mentioned colored opaque acrylic resin film 3 with excellent weather resistance, the FRP layer 1 will not deteriorate and the glass fibers will not come out to the outer surface. The weather resistance of the molded product is improved, and especially when the ultraviolet transmitting film 2 on the inner surface is also an adhesive synthetic resin film as described above, the weather resistance is further improved. Further, as described above, when the colored opaque acrylic resin film 3 is colored in two or more colors to form a pattern, the aesthetic appearance is further improved, which is highly desirable.

FIG. 2 is an enlarged partial sectional view showing another embodiment of the present invention, in which the ultraviolet curable FRP sheet has an ultraviolet opaque film 6 covering the ultraviolet ray transparent film 2 in a removable manner. As the ultraviolet opaque film 6, a synthetic resin film containing carbon, titanium, etc. is preferably used. The other configurations are the same as those in the previous embodiment.

In this way, the UV-transparent film 2 is covered with the UV-impermeable film 6 in a removable manner, and the FRP on the opposite side is covered with the UV-impermeable film 6.
When the surface of the layer 1 is covered with the colored opaque acrylic resin film 3, approximately 90% or more of ultraviolet rays are blocked by both films 6 and 3, and almost no ultraviolet rays reach the FRP layer 1.
Unlike conventional UV-curable FRP sheets, there is no need to store it in a UV-blocking packaging bag to prevent it from curing, and it becomes possible to store and transport it as it is. Then, during use, this ultraviolet opaque film 6
By peeling and removing it, it is possible to efficiently obtain a beautiful colored molded product in the same manner as described above, which is extremely convenient.

[Brief explanation of the drawing]

Fig. 1 is an enlarged end sectional view showing one embodiment of the invention, Fig. 2 is an enlarged partial sectional view showing another embodiment of the invention, and Fig. 3 is an explanatory diagram of an example of the use of the invention. be. 1... FRP layer, 2... Ultraviolet transmitting film, 3...
Colored opaque acrylic resin film, 6... Ultraviolet opaque film.

Claims (1)

[Scope of utility model registration request] One side of an uncured glass fiber-containing unsaturated polyester resin layer that can be cured by ultraviolet irradiation is covered with an ultraviolet-transparent film, and the opposite side of the resin layer is colored opaque acrylic that adheres to the resin layer when the resin layer is cured. An ultraviolet curing type characterized by being covered with a resin film.
FRP sheet.