JP2006297614A - Thermosetting resin molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermosetting resin molded product capable of expressing the pattern applied to paper or cloth or the appearance based on the material itself of the paper or cloth by the emission of fluorescent light in a case irradiated with ultraviolet rays even if the coating of the molded product with fluorescent coating, the printing of the fluorescent coating on a resin sheet and the formation of a masking or ultraviolet barrier layer on the surface coated with the fluorescent coating are not performed. <P>SOLUTION: The thermosetting resin molded product has a resin layer provided on one side or both sides of the paper or cloth containing a fluorescent dye, and at least the resin layer on one side has a total light transmittance of 30% or above. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a thermosetting resin molded product used for various members such as shelves, bathtubs, bathroom ceilings, walls, and floors.

  Conventionally, a molded article coated with a fluorescent light-emitting paint that emits fluorescence by irradiating a black light or LED that emits ultraviolet rays (wavelength: about 300 to 400 nm) or a molded article containing a fluorescent pigment is known. .

As an example of a molded product coated with a fluorescent paint, Patent Document 1 discloses a bathtub in which a fluorescent paint layer is formed on the surface of the bathtub and a transparent acrylic resin layer is further formed on the surface of the fluorescent paint layer. The bathtub shown by patent document 1 light-emits fluorescence by irradiating the black light installed in the edge of the bathtub.
Further, Patent Document 2 discloses a bathtub in which a fluorescent paint is applied in advance to a thermoplastic resin sheet by printing and then vacuum-formed. The bathtub shown in Patent Document 2 is one in which a fluorescent paint with a printed pattern emits fluorescence by irradiating ultraviolet rays from a black light.

  Further, as an example of a molded product containing a fluorescent pigment, Patent Document 3 discloses a product obtained by molding a composition obtained by kneading a fluorescent pigment in plastic (for example, an acrylic resin) with a press or the like. Fluorescence is emitted by irradiating ultraviolet rays from an LED arranged in the vicinity or inside of the molded product.

However, in the case of a molded product coated with a fluorescent paint (Patent Document 1), it is necessary to form a masking or ultraviolet shielding layer on the painted surface when the pattern is to be lifted by fluorescent emission when irradiated with ultraviolet rays. It was. For this reason, there were many work processes, and time and labor were required.
In a molded product (Patent Document 2) in which a fluorescent paint is printed on a thermoplastic resin sheet, it is necessary to print on an acrylic plate or the like. Compared to printing on paper or cloth, acrylic plates are harder, thicker, and heavier, so the workability is inferior, requiring time and effort.

In addition, in the molded product containing the fluorescent pigment (Patent Document 3), the entire surface of the molded product emits light when irradiated with ultraviolet rays. Therefore, when expressing a pattern, a masking or ultraviolet shielding layer is also formed. It was necessary and time and labor was required.
As described above, in these conventional molded products, it is difficult to express the pattern by the emission of fluorescence because it takes time and labor. Further, there has been no known molded product that expresses a pattern on paper or cloth by fluorescence emission or an appearance based on the material of paper or cloth itself.
JP 2000-116557 A JP 2004-17636 A JP 2004-103912 A

  The present invention solves the above-mentioned problem, without applying fluorescent paint on a molded product, printing fluorescent paint on a resin sheet, masking the surface coated with fluorescent paint, or forming an ultraviolet shielding layer. However, it is an object of the present invention to provide a thermosetting resin molded product capable of expressing an appearance based on a pattern on paper or cloth or a material of paper or cloth itself by emitting fluorescence when irradiated with ultraviolet rays. To do.

(1) The present invention is a thermosetting resin molded article having a resin layer on one or both sides of a paper or cloth containing a fluorescent dye, and at least the total light transmittance of the resin layer on one side is 30% or more. It is.
(2) In item (1), the thermosetting resin is an epoxy resin thermosetting resin molded product.
(3) In the item (1) or (2), the paper or cloth is a thermosetting resin molded article that is a Japanese paper or a non-woven fabric.
(4) A thermosetting resin molded article according to any one of items (1) to (3), further comprising one or more layers of paper or cloth.

According to the thermosetting resin molded article according to the present invention, by having a resin layer on one or both sides of a paper or cloth containing a fluorescent dye, a pattern expressed on the paper or cloth by ultraviolet irradiation with black light or the like, or Since the appearance based on the material of the paper or cloth itself emerges, it is possible to express a design that emits various lights by devising the design of the paper or cloth, and it is possible to bring about a better rendering effect.
Here, the pattern refers to a pattern expressed on paper or cloth, and includes patterns expressed by processing such as cutting or forming irregularities.
Further, the appearance based on the raw material itself refers to an appearance caused by a paper, cloth material, manufacturing method, use, or the like.

  In addition, the resin molded product of the present invention can be manufactured by impregnating a paper or cloth containing a fluorescent dye with a thermosetting resin in advance and placing it in a mold used for molding, followed by heat curing. In addition, since it does not require printing on a resin molded product, masking or formation of an ultraviolet shielding layer, it is excellent in productivity.

  The present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment in which a resin layer is formed on one side of a paper or cloth in a thermosetting resin molded product according to the present invention.
FIG. 2 is a cross-sectional view showing an embodiment in which resin layers are laminated on both sides of paper or cloth in the thermosetting resin molded product according to the present invention.
FIG. 3 is a cross-sectional view showing an example in which a paper or cloth and a resin layer are multilayered in the thermosetting resin molded product according to the present invention.
In the figure, 1 is a resin layer and 2 is a paper or cloth layer.

  As shown in FIG. 1, the thermosetting resin molded product of the present invention has a resin layer on one side of paper or cloth treated with a fluorescent dye and whitened, and the total light transmittance of the resin layer is 30%. This is the thermosetting resin molded product as described above. As shown in FIG. 2, it is possible to provide resin layers on both sides of paper or cloth, or to form a multilayer structure of resin layers, paper or cloth layers as shown in FIG.

  The resin layer 1 is obtained by appropriately selecting, blending, and curing a thermosetting resin, a curing agent, a curing accelerator, a polymerizable monomer, a filler, an internal mold release agent, a colorant, and the like according to the application. is there.

  The thermosetting resin may be any thermosetting resin having a total light transmittance of the resin layer of 30% or more. For example, epoxy resin, polyester resin, vinyl ester resin, urethane resin, urea resin, silicone resin, There are allyl resins, alkyd resins, and the like, and the curing agent can be selected according to the resin used.

The total transmittance of the resin layer of the thermosetting resin molded product is set to 30% or more unless it has transparency, and the effect of floating the paper or cloth inside the molded product cannot be sufficiently obtained and cured. This is because the production effect is faded.
The total transmittance of the resin layer of the thermosetting resin molded article is the total light transmittance of the resin layer excluding the paper or cloth layer when the resin layer is provided on one side of the paper or cloth containing the fluorescent dye. Say. When a resin layer is formed on both sides of a paper or cloth containing a fluorescent dye, it means the total light transmittance of at least one of the resin layers excluding the paper or cloth layer.
The total light transmittance is measured according to JIS K 7361-1: 1997.

  The fluorescent dye is not particularly specified. For example, bis (triazinylamino) stilbene disulfonic acid derivative, coumarin derivative, pyrazoline derivative, naphthalimide derivative, bisbenzoxazolyl derivative, bisstyryl biphenyl derivative, etc. are used. be able to.

  The paper or cloth layer 2 may be any layer that contains a fluorescent dye. For example, Japanese paper, shoji paper, dust paper, blotting paper, writing paper, gravure paper, art paper, fine paper treated with fluorescent dye and whitened. In addition to these, work cloths, non-woven fabrics, etc. can be used.

By using paper or cloth containing fluorescent dyes, the appearance of the pattern on paper or cloth that does not appear in sunlight or normal lighting, or the appearance based on the material of the paper or cloth itself, It becomes possible to make it appear by irradiating with ultraviolet rays.
Further, by using a paper or cloth that does not contain a fluorescent dye together with one containing a fluorescent dye at the time of molding, it is possible to improve the design when the ultraviolet light is not irradiated with black light or the like.
For this reason, the kind and number of paper or cloth not containing the fluorescent dye used together with the paper or cloth containing the fluorescent dye are not particularly limited.
In this way, when a paper or cloth that does not contain a fluorescent dye and a thing that contains a fluorescent dye have a multi-layer structure, a pattern of paper or cloth that does not contain a fluorescent dye appears under sunlight or normal lighting, On the other hand, under ultraviolet light such as black light, a pattern of paper or cloth containing a fluorescent dye emerges, and the design effect is further increased.

  Note that black light is illumination that emits ultraviolet rays of about 300 to 400 nm (also referred to as near ultraviolet rays), and the fluorescent material emits fluorescence when irradiated with this light.

  Paper or cloth can be cut or patterned to improve design, and paper or cloth having irregularities can also be used.

  As a method for producing a thermosetting resin molded article having a resin layer on one side or both sides of paper or cloth containing a fluorescent dye, any general molding method used for molding a thermosetting resin may be used. For example, there are cast molding, vacuum molding, press molding, and the like.

  A Japanese paper treated with a fluorescent dye and whitened in a casting mold was placed and fixed so as not to move during resin injection, and the mold was clamped with a clamp. Thereafter, an equivalent mixture of epoxy resin (EP-4100: manufactured by Asahi Denka Kogyo Co., Ltd.) and polyamine type curing agent (EH-3895: manufactured by Asahi Denka Kogyo Co., Ltd.) was poured into the mold, and impregnated into Japanese paper. After confirming this, it was cured by heating at 80 ° C. for 2 hours to obtain a thermosetting resin molded product having Japanese paper inside.

  The total transmittance of the resin layer of the thermosetting resin molding thus obtained is 87%, and it is not necessary to perform operations such as painting or masking during painting, and ultraviolet irradiation using black light or the like. As a result, only the Japanese paper inside the molded product emits light, which is excellent in design and brings about a good rendering effect.

  A nonwoven fabric treated and whitened with a fluorescent dye was set in a casting mold and clamped with a clamp. Then, an epoxy resin (EP-4100: manufactured by Asahi Denka Kogyo Co., Ltd.) and a polyamine curing agent (EH-3895: manufactured by Asahi Denka Kogyo Co., Ltd.) are poured into the mold and impregnated into the nonwoven fabric. After confirming that, a thermosetting resin molded product having a non-woven fabric inside was obtained by heat curing at 80 ° C. for 2 hours.

  The total transmittance of the resin layer of the thermosetting resin molding thus obtained is 87%, and it is not necessary to perform operations such as painting or masking during painting, and ultraviolet irradiation using black light or the like. As a result, only the non-woven fabric inside the molded product emits light, which is excellent in design and brings about a good rendering effect.

  A Japanese paper containing a fluorescent dye was placed and fixed in a casting mold so as not to move during resin injection, and the mold was clamped with a clamp. Thereafter, an equivalent amount of an epoxy resin (EP-4100: manufactured by Asahi Denka Kogyo Co., Ltd.) and a polyamine curing agent (EH-3895: manufactured by Asahi Denka Kogyo Co., Ltd.) is further added to silica (F8: High Silica Industry ( Manufactured by the same company) to produce blends with different transparency (total transmittance), poured into a mold and impregnated into paper or cloth, and then thermally cured at 80 ° C. for 2 hours to obtain paper or A thermosetting resin molded article having resin layers with different total transmittances on one side of the cloth was obtained.

For each thermosetting resin molded product thus obtained, the total transmittance of the resin layer was measured according to JIS K 7361-1: 1997 (Plastic-Test method for total light transmittance of transparent material-Part 1: Single. According to the beam method, it was measured using a turbidimeter (Nippon Denshoku Industries Co., Ltd., model: NDH-1001DP).
Further, in the dark room, the thermosetting molded product was placed at a distance of 5 cm from the black light (Mitsubishi Electric Manufacturing, 10 W), irradiated with ultraviolet rays from the resin layer side, and the fluorescence emission state was visually observed.
At that time, the fluorescence emission from the Japanese paper inside the thermosetting resin molded product can be visually confirmed, and a case where a good production effect is obtained is evaluated as 、, and a case where the light emission of the Japanese paper is difficult to understand is evaluated as △. did.
Table 1 shows the relationship between the total transmittance of the resin layer and the emission state of fluorescence from Japanese paper in this example.

表１に示すように、樹脂層の全透過率が３０％以上の場合は、和紙からの蛍光の発光が目視で確認でき、良好な演出効果が得られた。一方、２５％以下の場合は、和紙からの蛍光の発光がわかり難く、演出効果が不十分であった。

As shown in Table 1, when the total transmittance of the resin layer was 30% or more, fluorescence emission from Japanese paper could be visually confirmed, and a good rendering effect was obtained. On the other hand, in the case of 25% or less, it was difficult to understand the fluorescence emission from Japanese paper, and the effect of production was insufficient.

It is sectional drawing of the thermosetting resin molded product which has a resin layer on the single side | surface of the paper or cloth containing the fluorescent dye which is one Example of this invention. It is sectional drawing of the thermosetting resin molded product which has a resin layer on both surfaces of the paper or cloth containing the fluorescent dye which is one Example of this invention. 1 is a cross-sectional view of a thermosetting resin molded product in which a paper or cloth containing a fluorescent dye and a resin layer are multilayered according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin layer 2 Paper or cloth layer containing fluorescent dye 3 Paper or cloth layer

Claims (4)

  A thermosetting resin molded article having a resin layer on one or both sides of a paper or cloth containing a fluorescent dye, and having a total light transmittance of at least 30% on the resin layer on one side.   The thermosetting resin molded article according to claim 1, wherein the thermosetting resin is an epoxy resin.   The thermosetting resin molded product according to claim 1 or 2, wherein the paper or cloth is Japanese paper or non-woven fabric. 4. The thermosetting resin molded article according to claim 1, further comprising one or more layers of paper or cloth.

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