JPH0448094B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a light-transmitting curved decorative body, and more particularly, to a light-transmitting curved decorative body having a curved surface such as a cylinder or a conical shape used for ceilings, arcades, domes, lighting, etc. This invention relates to a transparent curved decorative body.

[Conventional technology]

BACKGROUND ART Conventionally, light-transmitting curved decorative bodies having a synthetic resin multilayer structure and having a curved surface such as a cylindrical shape or a conical shape have been known. In order to give strength to these decorations, glass fiber or synthetic fiber woven fabrics,
It is known that a nonwoven fabric is embedded in a surface layer.

[Problem that the invention seeks to solve]

However, in conventional decorative bodies of this type, reinforcing materials such as woven fabrics and non-woven fabrics are embedded in the surface layer, so the surface layer becomes cloudy and has poor light transmittance.
There were many items that were significantly inferior in decoration.

The present invention was made in view of the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide a light-transmitting curved decorative body with rich decorative properties without clouding of the surface layer.

[Means for solving problems]

As a result of intensive research to solve the above problems, the present inventors have found that the cloudiness of the surface layer occurs between the resin that makes up the surface layer and the filamentous or long fiber reinforcing material that makes up the woven fabric or non-woven fabric. It was determined that this was caused by a discrepancy between the two.

That is, as a method for manufacturing this type of decorative body, for example, a soft heat-curable synthetic resin liquid is coated on a mold, a mat-like reinforcing material such as a woven fabric is inserted into the resin liquid, and then hardened and made flexible. A heat-curable synthetic resin liquid that hardens after curing is coated on the flexible layer, and a reinforcing material such as a woven fabric is inserted into the resin liquid and then gelled to form a gelled layer. None, but a method has been adopted in which the flexible laminate is then shaped using a shaping mold to form an arbitrary curved surface, and then the uncured portions are cured to obtain a decorative body having a curved surface. When a flexible laminate is shaped using a shaping mold, the gelled surface layer is deformed into the shape of the shaping mold, and the pine-like reinforcing material is also deformed accordingly.
At this time, a misalignment occurs between the surface layer and the reinforcing material in the layer,
A space is created in the surface layer at the interface between the resin and the reinforcing material fibers. Therefore, when light is transmitted through the cured decorative body, that part appears cloudy.

In the research conducted by the present inventors, it was found that this misalignment is caused by the fact that the reinforcing material is formed into thread-like or long fibers, and this problem is caused by the fact that many needle-like reinforcing materials are used on both surface layers. It has been found that the solution can be solved without reducing the strength by incorporating

That is, the light-transmitting curved surface decorative body of the present invention is a synthetic resin material formed by shaping a synthetic resin laminate having at least one soft heat-curable synthetic resin layer and at least one soft heat-curable synthetic resin layer to have a curved surface. This is a light-transmitting curved decorative body having a resin multilayer structure, characterized in that a large number of acicular reinforcing materials are embedded in two synthetic resin layers forming both surface layers of the decorative body. .

Hereinafter, the present invention will be explained in detail with reference to the drawings.

The light-transmitting curved decorative body of the present invention (hereinafter simply referred to as decorative body) has a synthetic resin multilayer structure formed by shaping a synthetic resin laminate to have a curved surface. For example, as shown in FIG. Even if it has a three-layer structure made of synthetic resin, or
It may have a two-layer structure as shown in FIG. 4, or it may have a laminated structure of four or more layers.

In the figure, 1 is a decorative body, 2 is an internal layer located between the surface layers 3 and 4, 5, 5... are acicular reinforcing materials contained in large numbers inside each surface layer 3, 4, and 6 is an internal layer. The partition frame 2 is provided, and 7 is the unevenness provided on the surface layer.

The decorative body of the present invention can have any shape with a curved surface, such as a cylindrical shape as shown in FIG. 1, a truncated cone shape as shown in FIG. 5, and a semi-cylindrical shape as shown in FIG. Various shapes are possible.
Further, although each layer forming the decorative body must be transparent, some of the layers may be made opaque to enhance the decorative effect.

In the present invention, hard heat-curable synthetic resins and soft heat-curable synthetic resins are used as resins forming each layer of the decorative body.

As the hard heat-curable synthetic resin, unsaturated polyester resins, vinyl ester resins, epoxy acrylate resins, epoxy resins, etc., which are hardened after curing, and which are usually used for this type of decorative body can be used.

Further, as the above-mentioned soft heat-curable synthetic resin, unsaturated polyester resin, vinyl ester resin, epoxy acrylate resin, epoxy resin, etc. which have been modified so as to exhibit flexibility without being hardened after curing can be used. An example of a modified unsaturated polyester resin is synthesized using adipic acid or the like as a saturated dibasic acid.

These hard heat-curable synthetic resins and hard heat-curable synthetic resins can be used in any of the layers forming the decorative body, but at least one of each layer is a hard heat-curable synthetic resin layer, and at least one of the other layers is a hard heat-curable synthetic resin layer. One layer must be a soft heat-curable synthetic resin layer. For example, in FIG. 2, the surface layer 3 may be made of a hard heat-curable synthetic resin, and the surface layer 4 and the inner layer 2 may be made of a soft heat-curable synthetic resin, or only one or any other layer may be formed. 2
Both layers may be made of a hard heat-curable synthetic resin, but preferably one surface layer is a soft heat-curable synthetic resin layer and the other surface layer is a soft heat-curable synthetic resin layer. desirable.

The reason why at least one layer made of hard heat-curable synthetic resin is necessary is to maintain the curved state formed by the shaping mold when forming the decoration, and at least one layer made of soft heat-curable synthetic resin. The reason for this is that when producing the decorative body of the present invention, it is mainly carried out by hand molding, so it is difficult to obtain the same gelation rate at the same time for both surface layers sandwiching the decorative layer, so one surface layer is made soft. This is to increase the degree of gelation and to prevent misalignment between the fiber and the resin during bending.

In the present invention, a large number of acicular reinforcing materials are embedded in the two synthetic resin layers forming both surface layers.

The needle-shaped reinforcing material in the present invention has a total length of
The length used is 1.0 cm or less, preferably the total length is 0.1 cm or less, and more preferably the total length is 0.01 cm or less.
Further, it is preferable that the diameter of the acicular reinforcing material is appropriately selected within the range of 100 μm or less.

If the total length of the reinforcing material exceeds 1.0 cm,
When the resin and the reinforcing material are shaped into a curved shape using a shaping mold, there is a possibility that the resin and the reinforcing material may be misaligned, warped, or wrinkled, and as a result, the decorative body becomes cloudy.

The amount of reinforcing material embedded in each surface layer is about 5 to 200 parts by weight, preferably about 10 to 30 parts by weight, based on 100 parts by weight of the resin forming each surface layer. The amount of reinforcement material buried is the resin that forms the surface layer.
If it exceeds 200 parts by weight to 100 parts by weight, the transparency of the decorative body will be reduced, and if it is less than 5 parts by weight, the reinforcing effect will be poor.

As for the material of the reinforcing material, any material that has traditionally been used for this type of decorative body can be used, such as glass, nylon, vinylon, Tetron, etc., and other potassium titanate crystals etc. can be used. be.

In the present invention, in order to enhance the decorativeness of the decorative object, for example, as shown in FIGS. 2 to 4, a partition frame 6 having an arbitrary shape such as a design or a picture is provided in the surface layer or the inner layer.
, and the portion surrounded by the partition frame may be a colored transparent resin layer, or a portion thereof may be opaque. At this time, the above-mentioned hard or soft heat-curable synthetic resin is used to form the partition frame 6. Moreover, it is also possible to simply color one or more of the surface layer and the inner layer without forming a partition frame. Furthermore, Japanese paper or the like may be interposed between both surface layers instead of the inner layer. Further, an intermediate layer may be provided between the soft heat-curable synthetic resin and the hard heat-curable synthetic resin.

Further, each layer forming the decorative body may contain a cure accelerator, a catalyst filler, a pigment, a dye, etc., if necessary.

Furthermore, each surface layer can also be provided with irregularities. For example, as shown in FIG. 2, both surface layers 3 and 4 can be provided with unevenness 7, 7, or a third
As shown in Fig. 4, the unevenness 7 is only on one surface layer
It is also possible to provide However, it is not necessary to provide irregularities on both surface layers. As a method for manufacturing the decorative body of the present invention constructed as described above, a method for manufacturing the decorative body 1 shown in FIGS. 1 and 2 will be explained as an example. A soft heat-curable synthetic resin liquid that exhibits flexibility after curing is coated on the mold, and is cured to form a flexible surface layer 4;
Next, after forming a partition frame 6 with a soft heat-curable synthetic resin liquid on the surface layer 4, it is gelled, and then a hard heat-curable synthetic resin liquid is injected into the part blocked by the partition frame 6, and it gels to form the inside. Form layer 2.

Next, a hard heat-curable synthetic resin liquid that has been pre-contained with a needle-shaped reinforcing material and hardens after curing is coated, the surface of the coated resin liquid is covered with a flexible mold, and then the resin liquid is gelled. After that, the flexible laminate is placed on a shaping mold to be shaped, and the uncured portions are cured to obtain the decorative body 1.

The decorative body of the present invention can be used for lighting, ceilings, arcades, domes, etc., and the surface layer will not become cloudy.
It is a highly decorative object that is transparent to light.

〔Example〕

A cellophane sheet mold with a thickness of 50μ is spread out and placed on a level flat plate. On this mold, a soft heat-curable synthetic resin having the following blending ratio (A) and exhibiting flexibility after curing is drawn in a pattern.

Compounding ratio (A) Flexible unsaturated polyester resin 100 parts by weight Carbon black (pigment) 100 parts by weight Silica filler 20 parts by weight 6% cobalt naphthenate (cure accelerator)
0.5 parts by weight methyl ethyl ketone peroxide (catalyst)
1 part by weight Next, on the uncoated portion of the resin liquid on the mold, a heat-curable synthetic resin liquid having the following blending ratio (B) that exhibits flexibility after curing is added, with an average total length of 1 part by weight.
Glass fiber needle powder with a diameter of 100μ and a diameter of 20μ is used as a resin.
The design is constructed by adding 50 parts by weight of the dispersion to 100 parts by weight.

Compounding ratio (B) Flexible unsaturated polyester resin 100 parts by weight Blue (pigment) 0.3 parts by weight 6% cobalt naphthenate (cure accelerator)
0.5 parts by weight methyl ethyl ketone peroxide (catalyst)
1 part by weight Next, cure the coated soft heat-curable synthetic resin liquid that exhibits flexibility after curing, and add the following composition (C) to the soft heat-curable synthetic resin liquid that becomes hard after curing on average total length. A acicular powder of glass fiber having a diameter of 100 μm and a diameter of 50 μm dispersed in an amount of 50 parts by weight per 100 parts by weight of resin was added.

Blending ratio (C) Unsaturated polyester resin 100 parts by weight 6% cobalt naphthenate (cure accelerator)
0.3 parts by weight methyl ethyl ketone peroxide (catalyst)
1 part by weight Next, the surface of the coated resin liquid was covered with a cellophane sheet mold with a 50μ thick uneven design, and left at room temperature for about 5 minutes to gel.

Next, the flexible laminate, which had been separated from the flat plate and was sandwiched between cellophane sheet molds, was placed on the curved wooden mold prepared in advance, and pressed to fit into the wooden mold. let

Next, the wooden mold was placed in an oven for after-curing at 50°C for about 4 hours to completely cure the uncured parts.

Next, it was taken out of the oven, removed from the wooden mold, cut into desired dimensions, and the covered cellophane sheet mold was peeled off to obtain a product. The obtained product was free from cloudiness and had excellent decorative properties.

Comparative Example A decorative body was produced in the same manner as in the example except that glass fiber mat was used instead of the reinforcing material of glass fiber needle powder. The obtained decorative body had some parts that became cloudy when light was transmitted through it.

〔Effect of the invention〕

As explained above, the decorative body of the present invention is formed by shaping a synthetic resin laminate having at least one soft heat-curable synthetic resin layer and at least one hard heat-curable synthetic resin layer to have a curved surface. A light-transmitting curved decorative body with a synthetic resin multilayer structure,
Since the two synthetic resin layers forming both surface layers of the decorative body contain a large number of needle-shaped reinforcing materials, there is no cloudy part that is seen in conventional decorative bodies of this kind, and it is light-resistant. It is a decorative body because of its excellent transparency and rich decorative properties.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing an embodiment of the decorative body of the present invention, FIG. 2 is a vertical sectional view taken along the line of FIG. 1, and FIGS. The figures are longitudinal sectional views showing other embodiments of the present invention, FIG.
FIG. 6 is a perspective view showing still another embodiment of the present invention. 1...Light-transparent curved decorative body, 3, 4...Surface layer, 5
...Needle-shaped reinforcement.

Claims (1)

[Claims] 1. A light-transmitting curved decorative body having a synthetic resin multilayer structure, which is obtained by shaping a synthetic resin laminate having at least one soft heat-curable synthetic resin layer and at least one hard heat-curable synthetic resin layer to have a curved surface. A light-transmitting curved decorative body characterized in that a large number of acicular reinforcing materials are embedded in two synthetic resin layers forming both surface layers of the decorative body.