JPS6029351B2 - Manufacturing method of release sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing heat-resistant embossed rattan-shaped sheets, and more specifically, to manufacturing methods for manufacturing various plastic sheet-like products such as synthetic leather. The present invention relates to a method for manufacturing a release sheet with embossed molds that can withstand a heating process and does not cause uneven gloss or return of embossed parts.

The secondary embossed release sheet is made of a resin that has good adhesion to the material to be released, such as polyvinyl chloride or polyurethane, such as a thermoplastic resin such as polypropylene, or silicone, on the transfer sheet base material. After coating with a thermosetting resin such as a modified amino alkyd resin, embossing was applied using an embossing mold. However, since the former is a thermoplastic resin, it is not heat resistant and tends to cause uneven gloss and return of the embossing, while the latter forms a thermosetting resin film, making it difficult to obtain deep and sharp embossing. It was there. The present invention provides a heat-resistant embossed adjacent sheet that solves the above-mentioned problems.

That is, the gist of the present invention is a method for manufacturing a machine sheet, which includes the following steps.

'a - After coating a mold release agent composition containing a scale-like polymer, a reactive monomer or/and a reactive oligomer, and a solvent on a release sheet base material, the solvent is evaporated by drying, and a mold release polymer film is formed. A step of forming a mold layer having on the surface, [b- A step of imparting embossing to the mold layer with an embossing mold, and [c- Curing the embossed release layer by irradiating with ultraviolet rays or radiation. Process.

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

In the present invention, first, as shown in the first figure, a release agent composition containing a nutritious polymer, a reactive monomer or/and a reactive oligomer, and a solvent is coated on a transfer sheet substrate 1, and dried to form a nutritious mold. A wisteria-shaped paper 2 having a polymer film on the surface is formed.

As a result, a resin film made of a releasable polymer containing a reactive monomer and/or a reactive oligomer can be formed between the template polymer film on the surface and the base material. For this reason, it is also possible to wind up a coating sheet with reactivity inherent in it. Next, as shown in FIG. 2, Esovos E is applied to the release layer 2 of the coating sheet by applying heat and pressure to the release layer 2 of the coating sheet using an embossing die 3 from the release polymer film side.

As a result, some of the reactive monomers and/or reactive oligomers may be polymerized or crosslinked depending on their properties, but in order to completely cure them, ultraviolet rays or radiation 4 is irradiated as shown in the third figure to form a hard crane-cone-shaped layer 2A. Form. Next, materials, equipment, etc. used in the present invention will be explained according to the order of the steps.

First, the release sheet base material is required to have smoothness, wettability and adhesion with the sand molding agent composition so that it can be coated with the sand molding agent composition, and it is necessary to use materials such as high-quality paper, art paper, coated paper, etc. Plastic films such as paper and polyester can be used.

Next, the scale agent composition will be explained. The template polymer may be a polymer or prepolymer having mold release properties that has been conventionally used for release papers, such as silicone resins, alkyd resins, urethane resins, polyester resins, amino resins, One or a mixture of two or more phenolic resins can be used. Furthermore, these polymers or prepolymers can be provided with functional groups on side chains or terminals so as to be crosslinked or polymerized by light or radiation. Reactive monomers and reactive oligomers are the main parts of the present invention, and the present invention takes advantage of their good processability and good physical properties after polymerization or crosslinking. .

As the reactive monomer, photopolymerizable monomers can be used, such as acrylic acid or acrylic esters, methacrylic acid or methacrylic esters, acrylamides, vinyl esters, N-vinyl lactams, N-
- Among vinylpyridines, maleic acid or maleic acid esters, fumaric acid or fumaric acid esters, aromatic vinyl derivatives, vinyl ethers, etc., nonvolatile high-boiling monomers are preferably used.

Reactive oligomers have a molecular weight of 500 to 10,000 and have a functional group or unsaturated group at the terminal or side chain.
Oligomers of putadiene and isoprene, oligomers containing epoxy groups and isocyanate groups, oligoester acrylates: oligostyrenes, oligoesters, oligoamides, oligosiloxanes, and phenol formaldehyde with hydroxyl or carboxyl groups at the terminals. , trilobamide; oligovinylene, oligophenylene, oligoacetylene, oligophenylene quinone, and the like. Next, the solvent not only functions to adjust the viscosity of the release agent composition to a level that is easy to coat, but also evaporates under drying conditions below the temperature at which the reactive monomers and reactive oligomers do not react, and is released onto the surface of the coating layer. It is necessary to form a moldable polymer resin film, and alcohols such as ethyl alcohol and inpropyl alcohol, ketones such as ethyl ethyl ketone and ethyl isobutyl ketone, esters such as ethyl acetate and butyl acetate,
Aromatic hydrocarbons such as toluene and xylene, aliphatic hydrocarbons, ethers, etc. can be used.

In addition, the thickness of the scale-shaped layer is preferably 3 to 100 mm.

Further, when ultraviolet rays are used, efficient curing can be achieved by adding a photosensitizer to the above-mentioned mold release agent composition.

Here, as the photosensitizer, penzoin, benzoin ethyl ether, benzoin isobutyl ether, benzyl, diacetyl, benzophenone, anthraquinone, etc., and derivatives thereof can be used, and the amount added depends on the reactive monomer or/and 0 for reactive oligomers
．． It is used in a range of 1 to 1% by weight. Furthermore, for the purpose of stable storage of the template agent composition, a polymerization inhibitor may be added, such as hydroquinone, catechol, benzoquinone, nitrobenzene, naphthylamine, etc.
1000 legs can be added. Next, coating methods for the release agent composition include gravure coating, roll coating, spray coating, flow coating, /di coating,
Conventional coating methods such as air knife coating can be used.

Next, the embossed type will be explained.

An ordinary metal mold can be used as the emboss mold, and the emboss is formed by a dew coin method, an etching method, etc., and the shape can be a flat plate or a roll. Appropriate conditions for the embossing temperature vary depending on the type of scale agent, the shape of the embossing plate, the embossing pressure, and the heating and pressing time, but a range of 80°C to 180°C is appropriate. Next, after forming the embossing, ultraviolet rays or radiation is irradiated for post-curing.

As the ultraviolet rays, a mercury lamp, a chemical lamp, or the like having a wavelength of 280 to 460 can be used. Further, as a radiation source, an electron beam, a Co-60y beam, etc. can be used. As described above, the present invention provides a method for producing a heat-resistant embossed mold release sheet, and the release material that can be applied to the machine mold sheet obtained by the present invention includes most polymer compounds. Examples include liquid resin compositions. For example, cellulose resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl alcohol resin, nylon resin, polyacrylic acid and its ester resin, polymethacrylic acid and its ester resin, polyester resin, polyethylene ,
Thermoplastic resins such as olefin resins such as polypropylene: phenolic resins, aromatic hydrocarbon resins, urethane resins, amino resins such as urea resins and melamine resins, epoxy resins, unsaturated polyester resins, alkyd resins It is possible to use thermosetting resins containing thermosetting resins such as these and their derivatives alone or in mixtures as main components, to which plasticizers, stabilizers, curing agents, blowing agents, solvents, etc. are added as appropriate. Further, the liquid resin composition may be of an aqueous solution type, an emulsion type, a solvent type, or a melt type. Using the release sheet obtained according to the present invention, the above-mentioned material to be released 5 is applied onto the embossed surface of the rock-formed release layer 2A as shown in the fourth figure, and then dried and released as shown in the fifth figure. This makes it possible to make synthetic leather and decorative sheets with embossing, but it takes 150 oo to 25 mil to dry.
0,000 degrees of temperature is required, and with conventional transfer paper, the emboss returned and uneven gloss occurred, but with the release sheet of the present invention, no change is observed even after repeated use, and it is extremely heat resistant. be.

Hereinafter, this will be explained in more detail with reference to Examples.

Example 1 A scale-forming agent having the following composition was dried and roll-coated onto clay coat paper (manufactured by Kanzaki Paper ■) to a thickness of 30 layers.

Next, it was dried with 150 qo hot air to evaporate the solvent and form a silicone resin film.

After applying a present-like pattern to this using an embossing roll at 110℃, an in-line output 3 skin/skin high-pressure mercury lamp (
A release sheet was obtained by irradiating it with light (manufactured by Toshiba Corporation) at a distance of 1 cucumber. Using this release sheet, a mechanically foamed emulsion-type urethane resin is coated, a base fabric is buried, and then dried at 20 mm, and the release sheet is peeled off to form a foam with a pattern on the surface. Urethane synthetic leather was obtained.

Example 2 A mold release agent having the following composition was coated on kraft paper with a knife to a thickness of 20 mounds after drying.

Next, it was dried with hot air at 1802C to evaporate the solvent and form a film of melamine-modified alkyd resin.

This is then layered with an embossed flat plate with a crack pattern.1200
After hot-pressing at 0 for 3 minutes, the sheet was irradiated with an electron beam using a curtain beam type electron beam accelerator to obtain a template sheet. This template sheet was coated with an emulsion-type urethane resin containing an azo foaming agent, and dried and foamed at 20,000°C to obtain a synthetic leather made of foamed urethane with a crack pattern.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic sectional views for explaining each step of the manufacturing method of the present invention, and Figures 4 and 5 are for explaining how to use the release sheet obtained by the manufacturing method of the present invention. FIG. DESCRIPTION OF SYMBOLS 1... Release sheet Motomura, 2... Template layer having a release polymer film on the surface, 2A... Hardened scale layer, 3... Embossed type, 4 ...Ultraviolet rays or radiation, 5...Material to be released. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A method for producing a release sheet comprising the following steps. (a) After coating a release agent composition containing a release polymer, a reactive monomer or/and a reactive oligomer, and a solvent on a release sheet base material, the solvent is evaporated by drying, and the release polymer is coated. a step of forming a release layer having a film on its surface; (b) a step of applying embossing to the release layer using an embossing die; and (c) curing the embossed release layer by irradiating it with ultraviolet rays or radiation. process.