JPH07110531B2 - Suede-like forming sheet and method for producing the same - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a molding sheet for forming a suede-like matte coating film on the surface of an article having a three-dimensional shape,
The manufacturing method is also included.

[Prior art]

For matting on furniture and home appliances cabinets,
In particular, there is a growing need for plastic molded products with a suede-like, moist and calm appearance. Molding sheets are often used to produce molded articles with a matte appearance. The molding sheet used for this purpose has a base film on which an ink layer having mechanically provided fine irregularities on its surface is formed, or a so-called "mat material".
Examples of the material include a material obtained by printing a base film with an ink added with, and a material obtained by laminating a nonwoven fabric on the base film. In the case of mechanically providing fine irregularities, the degree of matting is limited because the irregularities are minute. Fine powder of silica, alumina or polyethylene is used when adding a matte material, but when the ink containing these is printed on the base film, the printed layer does not have elasticity and it is a molded product with a complicated shape. Is not available, and the effect of matting is small,
Depending on the viewing direction, it does not become matte. A product obtained by laminating a non-woven fabric on a substrate film can obtain a high matting effect, but still has the problem that it is difficult to mold because it is not elastic. In recent years, "bead pigments", that is, fine powders of pigments dispersed in a synthetic resin and granulated have come to be used as a colored matting material. The coating material to which the bead pigment is added has a high matte effect and can be matte from any direction to form a suede-like coating film having a soft texture. If you use elastic synthetic resin, even if the matte paint film hits, there is a restoring force.
It has the advantage of not being scratched in appearance. However, it is difficult to obtain a product of uniform quality by coating with such a paint, and the process is complicated and the equipment is large compared to the method of using a molding sheet.

[Problems to be Solved by the Invention]

The object of the present invention is a suede-like coating film that has a sufficient matte effect when viewed from any angle to the article, has a soft impression and large irregularities, and is capable of forming a highly durable product. To provide a seat. It is also an object of the present invention to provide a method for producing such a molding sheet.

[Means for Solving the Problems]

As shown in FIG. 1, the suede-like molding sheet of the present invention typically has a particle size distribution in the range of 5 to 80 μ and a maximum distribution of 10 to 10 on a substrate film having good moldability. A bead pigment in the range of 35μ is added to a vehicle of an ionizing radiation curable resin to form a coating film of a matte coating, and the coating film is cured by irradiation with ionizing radiation. The substrate film used in the present invention is a film of plastic having good moldability such as ABS resin polypropylene, polymethylmethacrylate, polystyrene, polyethylene, polyvinyl chloride, and a laminate of these may be used. The thickness of the base film is generally preferably 38 μm or more from the standpoint of strength and ease of handling. On the other hand, if the thickness is too thick, the formability is lowered, so the upper limit is 2 mm. The bead pigment, as described above, Fe ₂ O ₃ , TiO ₂ , CaCO ₃ ,
Fine powder of commonly used pigments such as quinacridone is used as an elastic resin such as polyurethane, acrylic resin, epoxy, polyester, nylon, fluororesin, vinyl chloride-vinyl acetate copolymer, or if necessary, a plasticizer and stabilizer. It is a granulated product obtained by dispersing it in a product to which a surfactant is added, and its particle size varies depending on the thickness of the coating film to be formed, but the distribution range is 5 to 80 μm. It is particularly preferable that the maximum distribution is in the range of 10 to 35 µ. The color of the bead pigment may be selected as desired. For example, an almost colorless and transparent bead pigment can be used to form a deep matte coating film, and even if two or more bead pigments are combined, a varied matte surface can be produced. A typical example of the ionizing radiation curable resin used for the vehicle is an electron beam curable resin, examples of which include epoxy acrylate, urethane acrylate, acrylic acid modified alkyd, and acrylic modified polyester as monomers or oligomers. Monomers such as neopentyl glycol-diacrylate pentaerythritol-triacrylate, trimethylolpropane-triacrylate, trimethylolpropane-trimethacrylate, and dipentaerythritol hexaacrylate were blended for the purpose of adjusting the crosslinked structure and adjusting the viscosity. It is a thing. If these monomers are added in a too large amount, the flexibility and the hardness of the cured resin will decrease, so that the physical properties of the cured product may be adjusted by appropriately diluting it with a solvent such as methyl ethyl ketone, ethyl acetate or toluene. If a vehicle in which a thermoplastic resin such as urethane elastomer, cellulose acetate propionate, acrylic resin, polyester, polystyrene, vinyl chloride-vinyl acetate copolymer or rubber resin is mixed is used as the resin, the moldability of the coating film is improved. And thus the moldability of the molding sheet can be improved. The coating film preferably has a breaking elongation of 60% or more in order to realize sufficient moldability. As shown in FIG. 2, it is a recommended mode to provide a surface protective layer on the coating film (2) to improve surface physical properties such as abrasion resistance and scratch resistance of the molded product. Suitable materials for the surface protective layer are, for example, acrylic, vinyl chloride-vinyl acetate copolymer or urethane elastomer, and those obtained by adding an appropriate additive thereto. The production method of the present invention for providing a molding sheet as described above has the above-mentioned particle size on the base film, that is, the particle size distribution is in the range of 5 to 80 μ, and the maximum distribution is in the range of 10 to 35 μ. It consists of applying a coating material in which a certain bead pigment is added to the vehicle of an ionizing radiation curable resin, and irradiating it with ionizing radiation such as an electron beam or ultraviolet rays to cure the coating film. As a modification, as shown in the process in FIG. 3, the above coating material is applied to an auxiliary film (4) having a mirror surface or a matte and peelable surface, and the coating film (2) is sandwiched between the auxiliary film (4). It is also possible to follow the steps of laminating the material film (1), then irradiating it with ionizing radiation to cure the coating film, and then peeling off the auxiliary film. In FIG. 3, (8) is a coating material application means, and (9) is an ionizing radiation irradiation means. As yet another aspect, the above coating material is applied onto a substrate film having good moldability, and an auxiliary film having a peeling property with a mirror surface or matte is sandwiched so as to sandwich the coating film,
Then, a step of irradiating with ionizing radiation to cure the coating film and then peeling the auxiliary film is also possible. When the surface protective layer is provided in these embodiments, it may be formed in advance on the surface of the auxiliary film to which the coating material is applied. If it is desired to make the surface of the paint matt particularly strongly, the surface of the auxiliary film should be matted. Suitable materials for the auxiliary film are polyimide, polyamide, eval, polypropylene, cellophane, polyester, fluororesin, polymethylpentene, and the like, and these may be laminated on paper. Further, paper may be used as a release layer by providing a cured layer of silicone or melamine. Matte treatment is powder kneading, sand blasting,
It can be performed by known means such as scientific processing. The molding sheet can also have a surface matte finish by using an auxiliary film having a coating film-forming surface provided with a layer of a heat-crosslinking resin in which a matting material and a slip material are mixed. When a bead pigment with a relatively large particle size is used, the particle size of the bead pigment may be larger than the film thickness, so roll coating, reverse coating, kiss coating, screen printing, etc. , Choose what makes it possible. Electron beams are emitted from various electron beam accelerators, and 100 to 300
KeV, preferably with an energy in the range 150-200 KeV is used. Irradiation may be performed from either the base film side or the curable resin (auxiliary film) side. The surface protective layer may be formed on the auxiliary film or on the coating film by a known coating means.

[Work]

The matte paint with bead pigment added to the vehicle has a larger particle size than conventional matte paints that use conventional matte materials such as silica powder, and the large-diameter particles project on the surface to form irregularities. By doing so, a matte effect is obtained. Since the unevenness is large and deep, the matte degree is sufficient. Since the pigment particles are covered with the elastic resin, the shape of the particles is restored when the external force is removed, so that the matte appearance does not change. Since the coating film has a soft feel, it is possible to give a high-grade suede-like appearance and feel. However, the above-described matte coating uses a thermosetting resin as a vehicle, and requires a curing step by heating to form a coating film. On the other hand, it is necessary to use a material having good moldability as the base film of the molding sheet, but such a film is generally weak to heat and cannot withstand the heating conditions for curing the coating film. . There is also a means of curing a coating film on a heat resistant film and laminating it on a base film, but heat resistant films are generally not elastic and few have good moldability. Therefore, the present inventors have used a matte coating which uses an ionizing radiation curable resin as a vehicle, which can be cured without heating. Typical ionizing radiations are ultraviolet rays and electron beams, and among them, electron beams that can be cured by using a colored vehicle are advantageous. Further, many sheets having good moldability have poor solvent resistance, but the electron beam curable resin is convenient because it does not require a solvent.

Example 1 A matte paint having the following composition was prepared. Urethane acrylate 50 parts Bifunctional acrylate monomer 17 parts Acrylic resin beads 30 parts Polyethylene wax 3 parts Polyvinyl chloride film "GX-1" (manufactured by Riken Vinyl) with a thickness of 0.35 mm, roll coater (roll temperature: 60) ℃), and irradiated with an electron beam of 200 KeV. The elongation of the obtained forming sheet was 120%, and vacuum forming at 130 ° C. was possible.

Example 2 A matte paint having the following composition was prepared. Urethane acrylate 30 parts Dipentaerythritol hexaacrylate 10 parts Urethane beads 20 parts Polymethylmethacrylate 20 parts Polyethylene wax 3 parts Methyl ethyl ketone and ethyl acetate 17 parts Coat a thermosetting acrylic resin mixed with a matting agent on a 25μ thick polyester film. The film "# 100F type" (manufactured by Panac Industrial Co., Ltd.), which has been baked and then release-coated, is used as the auxiliary film, and the ABS resin film "A404" (manufactured by Sanpo Resin) with a thickness of 0.35 mm is used as the base film did. The above paint was applied to the auxiliary film to form a coating film having a thickness of 40 μm, and a base film coated with acrylic primer “HS-32G” (manufactured by Showa Ink Co., Ltd.) was laminated on the coating film. 18
After irradiating 0 KeV electron beam, peel off the auxiliary film,
A molding sheet of the present invention was obtained. This molding sheet was placed in an injection molding die for vacuum preforming, and then ABS resin was injection-molded to obtain an insert-painted product. The obtained product had a suede-like three-dimensional surface.

【The invention's effect】

By using the molding sheet of the present invention, a suede-like coating film having a sufficient matte effect and a soft feeling can be provided on the surface of a plastic molded product having a three-dimensional shape. Therefore, if this molded product is used as an exterior material or the like, a dignified product can be obtained. According to the manufacturing method of the present invention, such a molding sheet can be easily obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a basic form of a molding sheet of the present invention. FIG. 2 is a sectional view similar to FIG. 1, showing a preferred embodiment of the molding sheet of the present invention. FIG. 3 is a conceptual diagram of an apparatus for explaining the method for manufacturing a molding sheet of the present invention. 1 ... Substrate film, 2 ... Coating film, 3 ... Surface protective layer, 4 ... Auxiliary film, 8 ... Coating means, 9 ... Ionizing radiation irradiation means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 31/28 7148-4F // B29C 45/16 8823-4F 63/02 9446-4F

Claims (3)

[Claims] 1. A bead pigment having a particle size distribution in the range of 5 to 80 μm and a distribution maximum in the range of 10 to 35 μm is added to a vehicle of an ionizing radiation curable resin on a substrate film having good moldability. A suede-like molding sheet obtained by providing a coating film of the matte paint and curing the coating film by irradiation with ionizing radiation. 2. An ionizing radiation-curable bead pigment having a particle size distribution in the range of 5 to 80 μm and a maximum distribution in the range of 10 to 35 μm on an auxiliary film having a mirror surface or a matte and releasable surface. Apply the paint added to the resin vehicle, attach a base film with good moldability so that the coating film is sandwiched, then irradiate an electron beam or ultraviolet ray to cure the coating film and then peel the auxiliary film A method for producing a suede-like sheet for molding. 3. A bead pigment having a particle size distribution in the range of 5 to 80 μm and a distribution maximum in the range of 10 to 35 μm is added to a vehicle of an ionizing radiation curable resin on a substrate film having good moldability. The matte coating is applied, and an auxiliary film having a peelable surface is mirror-finished or matte so as to sandwich the coating, and then the coating is cured by irradiating it with an electron beam or ultraviolet rays, and then the auxiliary film. A method for producing a suede-like molding sheet, which comprises peeling.