JPH0482736A - Suede like sheet and preparation thereof - Google Patents

Abstract

PURPOSE:To enhance a high-grade feeling and a soft feeling by obtaining the mat film strongly and closely bonded to a base material sheet by providing a film of mat paint wherein bead pigment is added to the vehicle of a two-pack type curable resin on the base material sheet specified in its wetting index. CONSTITUTION:The wetting index of the surface of a base material sheet is set to the range of 38-60dyne/cm. Bead pigment is prepared by dispersing titanium dioxide in a polyurethane resin and granulating the resulting mixture and synthetic resin beads are formed by especially adding the pigment to polyurethane resin particles having a particle size of about 5-300mum and, since these beads have matting effect and a film has a soft feeling, a high-grade suede like feeling can be developed from the aspect of appearance and the feel. The close adhesiveness of the base material sheet and the suede like film is markedly enhanced by specifying the wetting index of the base material sheet and, since a two-pack type curable resin is used as the vehicle of bead pigment or synthetic resin beads, the abrasion resistance of the film is also enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a strong suede-like matte coating film on the surface of a base sheet, giving it a luxurious appearance and making it easy to touch. This invention relates to a sheet that sometimes feels soft and a method for manufacturing the same.

[Conventional technology]

There is an increasing demand for the surfaces of furniture, home appliances, OA equipment, stationery supplies, etc. to be matte, and in particular to have a soft, suede-like appearance with a soft and calm appearance.

In order to manufacture sheets with a matte appearance, there are methods that include forming an ink layer that mechanically creates minute irregularities on the surface of the sheet,
There are sheets that are printed with ink containing a mantle agent on the surface of the sheet.

However, in the case where fine irregularities are mechanically provided, there is a limit to the degree of matting because the irregularities are minute.

In addition, when adding a mantle agent, fine powders of silica, alumina, polyethylene, etc. are used, but when ink containing these is printed on the sheet surface, the printed layer has no elasticity and the matting effect is small. (Depending on the viewing direction, the matte effect may not appear.

In recent years, bead pigments, that is, fine pigment powders dispersed in synthetic resin and made into particles, have come to be used as colored matting agents.

Paints containing bead pigments have a great matte effect, and can form suede-like coatings that appear matte from any direction and have a soft texture.

If an elastic synthetic resin is used for the coating, it will have the ability to recover even if an object hits the coating surface, so it has the advantage of not causing any scratches on the appearance.

[Problems to be Solved by the Invention] However, the adhesion between the coating film of such paint and the base sheet is not necessarily sufficient, and peeling of the paint film and uneven unevenness are likely to occur. Painting and film-forming methods also have problems in that the manufacturing process is complicated and there is a lot of paint loss.

Therefore, an object of the present invention is to eliminate such drawbacks and provide a suede-like sheet that has a matte coating film firmly adhered to the base sheet and is rich in luxury and softness. It is in.

Another object of the present invention is to provide a method for easily and efficiently manufacturing such a suede-like sheet.

[Means for solving problems]

The gist of the present invention is as follows: 1. A bead pigment and/or synthetic resin beads are added to a two-component curable resin vehicle on a base sheet having a wetting index in the range of 38 to 60 dyne/cvn. A suede-like sheet with a coating of matte paint.

2. The suede-like sheet according to claim 1, wherein the thickness of the coating film is 5 μm or more.

3. The suede-like sheet according to claim 1 or 2, wherein the gloss of the coating film is 1.0% or less.

4. Add bead pigment and/or synthetic resin beads to a two-component curable resin vehicle on a base sheet whose surface has been treated so that the wetting index is in the range of 38 to 60 dyne/cm. A method for producing a suede-like sheet, which comprises applying a matte paint and curing the paint film by drying at room temperature or heating.

5. The method of manufacturing a suede-like sheet according to claim 4, wherein a screen printing method is used as the paint application means.

It is in.

The base sheet used in the present invention is polypropylene, polyethylene, polystyrene, polymethyl methacrylate, A
Plastics such as BS resin, polyvinyl chloride, polycarbonate, polyamide, and polyethylene terephthalate may be used, and a laminate of these or a laminate of these and other materials such as metal may also be used. Furthermore,
Paper, synthetic (artificial) leather, natural leather, etc. may be used.

The thickness of the base sheet depends on strength, ease of handling, etc.
Generally, 50 to 3.000 μm is preferred.

In the present invention, it is necessary that the surface wettability index of this base sheet is in the range of 38 to 60 dyne/am.

The wetting index of the base sheet is the surface tension (
d y n e / c + m), and the wetting index for increasing the adhesion between the base sheet and the suede-like coating film is preferably 38 to 60 dyne/cm, and a value outside this range will result in an insufficient coating film. Adhesion cannot be obtained.

Plastic base sheets generally have low energy surfaces and lack activity, and therefore often have poor adhesion to the coating film used in the present invention.

As a means for adjusting the wettability index of the base sheet to 38 to 60 dyne/-, it is preferable to modify the surface of the base sheet by surface treatment.

Surface treatment methods for keeping the wettability index of the base sheet within the target range include corona discharge treatment, plasma treatment, flame treatment, ultraviolet treatment, electron beam treatment, radiation treatment, chemical treatment, and physical roughening treatment. , and surface coating treatment.

Bead pigments include titanium dioxide, yellow iron oxide, red iron oxide, navy blue, chrome green, carbon black, Hansa yellow, lake red, quinacridone violet, copper phthalocyanine, calcium carbonate, barium sulfate, talc,
Fine powder of inorganic or organic pigment such as clay is mixed with polyurethane resin, acrylic resin, epoxy resin, polyester resin, polyamide resin, fluororesin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, etc. Elastic resin, or plasticizer, stabilizer, surfactant, dispersant, antifoaming agent, leveling agent, thickener, film-forming aid, anti-mold agent, anti-aging agent as required. , antioxidants, ultraviolet absorbers, heat stabilizers, light stabilizers, and other known additives for coatings.
It is made into particles, and the distribution range is 5 to 300μ.
It is m. Paints containing such bead pigments include:
For example, there are products manufactured by NOF ■ such as the product name Bellsoft.

Note that the color of the bead pigment may be selected as desired. By combining bead pigments of two or more colors, a coating film with a wide variety of characteristics can be obtained.

Next, the synthetic resin beads in the present invention include polyurethane resin, acrylic resin, epoxy resin, polyester resin, polyamide resin, fluororesin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate resin, and the like used in the bead pigment. Elastic resins such as polymer resins, or plasticizers, stabilizers, surfactants, dispersants, antifoaming agents, leveling agents, thickeners, film-forming aids, and mold-proofing agents as required. It is made into particles with a size of about 5 to 300 μm and contains various additives known for use in paints, such as additives, anti-aging agents, antioxidants, ultraviolet absorbers, heat stabilizers, and light stabilizers. Therefore, pigments are not particularly added or dispersed.

Therefore, it can be made into colorless and transparent beads, and when used, a deep matte coating film can be obtained.

Next, as the two-component curable resin used for the vehicle, the main resin used is urethane-modified acrylic resin, urethane-modified polyester resin, urethane-modified alkyd resin, urethane-modified epoxy resin, etc., and the curing agent is: As the polyisocyanate prepolymer, for example, tolylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, an adduct of hydrogenated xylylene diisocyanate and trimethylolpropane, or biuret or isocyanurate of the above diisocyanate can be used. It will be done.

Preferred organic solvents that can be used to dilute the two-component hard resin include ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, ester solvents such as ethyl acetate and butyl acetate, and aromatic solvents such as toluene and xylene. Hydrocarbon solvents and cellosolve solvents such as butyl cellosolve can also be used.

The crosslinking reaction (cure) of the two-component curable resin depends on the thickness of the suede-like coating film formed on the base sheet and the material of the base sheet, but it is generally performed at 70'C to 100C to 150C.
This is done by heating and drying for 30 minutes.

This crosslinking reaction may be carried out by drying at room temperature instead of by heating, but in this case, it takes more time for the solvent to evaporate and for the curing to progress than in heating drying.

The thickness of the suede-like coating film coated on the base sheet is 5
It is preferable that it is .mu.m or more. If the thickness is less than 5 μm, a suede-like matte effect can be obtained, but the soft feeling visually or to the touch is insufficient, making it difficult to obtain a coating film with an overall calm appearance.

The gloss level, which is a measure of the matte effect of the suede-like coating film applied on the base sheet, is determined by measuring the surface gloss with a gloss meter (both incident angle and acceptance angle 60°), and the value is 1.
．． Preferably, it is 0% or less, and more preferably,
It is 0.5% or less, and in this case, the coating surface is almost completely matte and has an appearance with an excellent soft feel.

If the gloss level is 1.0% or more, it is slightly glossy,
The appearance of the coating film tends to be lacking in softness.

When using bead pigments and/or synthetic resin beads with a relatively large particle size, the method of forming a matte paint film on a base sheet is based on the particle size of the bead pigment or synthetic resin beads rather than the film thickness. Since it is larger, roll coat,
reverse coat, kiss coat, flow coat, screen printing, knife coat, barcode, spray coat,
It is necessary to select a coating method that makes this possible, such as a known coating method such as dip coating.

The present invention is characterized in that a screen printing method is employed as a method for forming a coating film of a matte paint on a base sheet.

The reason for this is that paint loss is much lower than with other methods. It is possible to produce a wide variety of products in a small loft.

Further, it has the advantage that a desired design can be printed on the base sheet and that multicolor overcoating (multicolor printing) can be performed.

The screen gauze used for screen printing is silk,
These include nylon, Tetron, stainless steel, nickel, and alpha.

In the present invention, it is particularly preferable to use stainless steel for the screen gauze because of its excellent dimensional stability, ink permeability, chemical resistance, etc.

The mesh of stainless steel screen gauze is 150 (105
[mu]m) to 60 (250 [mu]m) mesh can be preferably used.

If it is coarse (less than 60 meshes), there will be too much paint attached and the printing accuracy will decrease, and if it is finer than 150 meshes, the amount of paint deposited will be too small, making it difficult to obtain the desired coating film. .

[Effect]

Matte paints made by adding bead pigments or synthetic resin beads into a two-component hardening resin are different from matte paints using conventional matting agents such as fine powders of silica, alumina, polyethylene, etc. Large-diameter particles of bead pigments and synthetic resin beads protrude from the surface and form irregularities, causing diffuse reflection of light and producing a matte effect.

The beads themselves are made of elastic synthetic resin, and the bait particles are covered with elastic synthetic resin, so even if an external force is applied, the particles will deform and absorb it, and when the external force is removed, the particles will deform. Since the shape of is restored, the appearance of the extinguisher does not change.

Since the beads in the coating are made of elastic synthetic resin,
The paint film has a soft feel, so in terms of appearance,
In addition, it can give the feel of a high-quality suede to the touch.

The adhesion between the base sheet and the suede-like paint film can be significantly improved by specifying the wettability index of the base sheet, and by using a two-component curable resin as a vehicle for bead pigments and synthetic resin beads. This also improves the abrasion resistance of the paint film.

〔Example〕

Prepare three polypropylene sheets with a thickness of 0.5 mm,
38 to 42 dyne/am on each side of these,
-47~51dyne/ci+, 56~60dyne/
Corona discharge treatment was carried out so that it fell within the range of cm.

A paint containing urethane resin beads (manufactured by Fujikura Kasei Co., Ltd., product name, Bell pex),
To make it easier to print, an appropriate amount of thinner was added, and a 100-mesh stainless steel screen was used to print to a thickness of 20 pm, and the coating was dried by heating at 80°C for 20 minutes to harden the coating. .

The surface gloss of the obtained sheet was 0.2 when measured with a gloss meter, and visually it was
It also had a high-quality suede-like surface to the touch.

In addition, a test for peeling the paint film of the obtained sheet was conducted by firmly pasting an adhesive sheet on the surface and peeling it off, but the paint film adhered to the polypropylene sheet side.
There was no peeling at all.

[Comparative example]

First, two polypropylene sheets with a thickness of 0.5 mm similar to those in the above example were prepared, and only one of them was
Corona discharge treatment was carried out so that it fell within the range of 31 to 35 dyne/cm, and then the above 2.
Two sheets were printed and the coating was cured under the same conditions.

Next, a coating film peeling test was performed on the obtained sheet in the same manner as in the example, and it was found that, like the untreated corona discharge sheet, the corona discharge treated sheet also had a portion of the paint film removed on the pressure sensitive adhesive sheet side. I've been beaten.

〔Effect of the invention〕

As described above, according to the present invention, there is a sheet that has a large diffused reflection of light and a large matte effect, and also has an excellent appearance.
It also has a tactile feel similar to that of high-quality suede.

Further, the adhesion between the base sheet and the suede-like coating film is good, and the coating film also has wear resistance, so there is an advantage that it can be used in products that require durability.

In addition, by using a two-component curable resin as a binder, the coating film can be formed with simple equipment such as heating, and by using a screen printing method as the coating method, It has the advantages of improving yields by reducing paint loss, being able to handle small-lot production of a wide variety of products, printing desired design patterns, and printing in multiple colors.

Claims (1)

[Claims] 1. A matte paint prepared by adding bead pigments and/or synthetic resin beads to a two-component curable resin vehicle on a base sheet having a wettability index in the range of 38 to 60 dyne/cm. A suede-like sheet with a coating film. 2. The suede-like sheet according to claim 1, wherein the thickness of the coating film is 5 μm or more. 3. The suede-like sheet according to claim 1 or 2, wherein the gloss of the coating film is 1.0% or less. 4. A matte paint in which bead pigments and/or synthetic resin beads are added to a two-component curable resin vehicle on a base sheet that has been surface-treated to have a wettability index in the range of 38 to 60 dyne/cm. 1. A method for producing a suede-like sheet, the method comprising: coating the film and curing the coating film by drying at room temperature or heating. 5. The method of manufacturing a suede-like sheet according to claim 4, characterized in that a screen printing method is applied as a means for applying the paint.