JP2001058371A - Acrylic resin film laminated veneer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart depth and to improve processability and durability while reducing cost by laminating an acrylic resin film of which the tensile breaking elongation at specific temp. is a specific value. SOLUTION: An acrylic resin film of which the tensile breaking elongation at 23 deg.C is 80% or more is laminated. As an acrylic resin, an innermost layer polymer using a monomer containing alkyl acrylate and/or alkyl methacrylate and a graft crosslinking agent, a crosslinked elastic polymer (intermediate layer) using an alkyl acrylate monomer and the graft crosslinking agent and an outermost layer polymer using an alkyl methacrylate monomer are used. If an ultraviolet ray absorber is added when the acrylic resin film is produced, weatherability is obtained and a benzotriazole or triazine type ultraviolet absorber is preferable. The thickness of the acrylic resin film is preferably 15-300 μm. Veneer is obtained, for example, by cutting wood and the thickness thereof is preferably 100-700 μm from an aspect of handling properties and processability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acrylic film laminated veneer having a deep, high-class feel and good workability.

[0002]

2. Description of the Related Art Veneer boards have been widely used for building materials, furniture, automobile interior materials and the like. For example, there is a veneer with backing made of Japanese paper or nonwoven fabric to improve strength and handleability, and a veneer with improved weather resistance by applying a clear coating having an ultraviolet absorbing function to the surface.

[0003]

Generally, building materials, furniture,
Products such as automobiles require durability. On the other hand, veneers are brittle and easily broken. Therefore, when a veneer is used for such a product, it is necessary to prevent the crack by bonding paper to the back surface of the veneer, and this causes an increase in cost.

[0004] In order to give the surface of the veneer a luxurious feeling with a sufficient depth and also to provide weather resistance, it is necessary to repeat the coating several times to several tens of times, which also increases the cost. Cause. Further, since a large amount of solvent is used in the coating process, there is a problem in terms of working environment.

[0005] An object of the present invention is to provide a low-cost veneer plate which is excellent in a deep luxury feeling, has good workability and durability, and is low in cost.

[0006]

The present invention is a veneer laminated with an acrylic film having a tensile elongation at break at 23 ° C. of 80% or more.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below.

[0008] The acrylic film used in the present invention is 23
It is necessary that the tensile elongation at break at 80 ° C. is 80% or more. The tensile elongation at break is a value measured by preparing a tensile test specimen of an acrylic film according to JIS C-2318. By using such an acrylic film, cracking of the veneer during processing or transportation can be very effectively prevented, workability and durability of the veneer can be significantly improved, and the veneer manufacturing cost is low.

The raw material of the acrylic film is not particularly limited. In order to obtain a film having a tensile elongation at break of 80% or more, in particular, it is necessary to use a multilayer structure polymer containing an acrylic resin crosslinked structural elastic copolymer alone or in combination with another acrylic resin-based polymer. preferable. In addition, from the viewpoint of workability, handling, design, and a sense of depth during manufacturing and post-processing, those having high flexibility and transparency are preferable.

[0010] For example, Japanese Patent Publication No. 6-45737,
Acrylic resin-based multilayered polymers and compositions thereof described in JP-B-62-19309 and JP-B-63-20559 can be used.

Specifically, as the acrylic resin, an innermost layer polymer obtained by using a monomer containing an alkyl acrylate and / or an alkyl methacrylate and a graft crosslinking agent, an alkyl acrylate, and if necessary, a polyfunctional resin A crosslinked elastic polymer (intermediate layer) obtained using a monomer containing a monomer and a graft crossing agent, and an outermost layer polymer obtained using a monomer containing an alkyl methacrylate as a basic structural unit. Acrylic resin-based multi-layered polymer or the like can be used. As the acrylic resin-based multilayer structure polymer, one kind may be used alone, two or more kinds of multilayer structure polymers may be used in combination, or another resin may be used in combination.

An acrylic resin-based multilayer structure obtained by polymerizing a monomer containing a methacrylate ester in the presence of an elastic copolymer obtained from a monomer containing an acrylic ester and a crosslinkable monomer. A polymer (rubber-containing polymer) can also be used. As the acrylic resin-based multilayer structure polymer, one kind may be used alone, two or more kinds of multilayer structure polymers may be used in combination, or another resin may be used in combination. Examples of use in combination with other acrylic resins include the above-mentioned acrylic resin-based multilayer structure polymer (rubber-containing polymer) and a polymer obtained using a monomer containing a methacrylic acid ester, which has a reduced viscosity (polymer Is dissolved in 100 ml of chloroform and measured at 25 ° C.) and a thermoplastic polymer containing 0.1 L / g or less of a two-component acrylic resin composition.

[0013] Another example of using together with another acrylic resin is the above-mentioned acrylic resin-based multilayer polymer (rubber-containing polymer) and a polymer obtained by using a monomer containing methyl methacrylate. And a polymer obtained by using a thermoplastic polymer having a reduced viscosity (measured under the above conditions) of more than 0.1 L / g and a monomer containing a methacrylic acid ester, and having a reduced viscosity (measured under the above conditions) And an acrylic resin composition containing three components with a thermoplastic polymer having a content of 0.1 L / g or less.

The method of forming these raw materials (acrylic resin composition) into a film is not particularly limited, but a melt extrusion method is preferred in terms of productivity. Typical melt extrusion methods include a T-die method and an inflation method. From the viewpoint of production stability, the T-die method is particularly preferred.

In the production of the acrylic film, it is preferable to add an ultraviolet absorber. As a result, sufficient weather resistance is obtained, and the veneer is hardly discolored even when used for a long time,
Cracks due to deterioration hardly occur. The ultraviolet absorber is not particularly limited, but a benzotriazole-based or triazine-based ultraviolet absorber is preferable from the viewpoint of weather resistance.

If necessary, conventionally known compounding agents such as stabilizers, lubricants, processing aids, plasticizers, impact aids, foaming agents, fillers, coloring agents, matting agents and the like are added. You can also.

The thickness of the acrylic film is preferably 15 μm or more and 300 μm or less. 15 μm thickness
In this case, a high-grade sense of depth tends to be more remarkably exhibited. When the thickness is 300 μm or less, it is advantageous in terms of cost.

The veneer used in the present invention is not particularly limited, and various types of veneers conventionally known can be used. Such a veneer can be manufactured, for example, by cutting desired wood. The thickness of the veneer is not particularly limited,
It is preferably about 100 μm to 700 μm from the viewpoint of handleability and workability. Further, the surface of the veneer plate may be subjected to coloring if necessary.

The acrylic film laminated veneer of the present invention is obtained by laminating the acrylic film described above on such a veneer. The laminating method is not particularly limited, but a method of laminating and bonding both using an adhesive is preferable.

The adhesive is preferably transparent or becomes transparent when cured. Specifically, vinyl acetate, ethylene-vinyl acetate, urea, melamine, phenol, acrylic, urethane, polyurethane, epoxy, silicone, resorcinol, polyester, isocyanate, synthetic rubber Adhesives such as adhesives. These can be used alone or as a mixture.

At the time of bonding, it is preferable to perform pressure bonding by a method such as a roll press, a cold press, a hot press, a laminator, lapping, and a vacuum press, if necessary. Further, at the time of bonding, embossing can be performed on the acrylic film surface side.

[0022]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.
In the examples, “parts” means “parts by weight” unless otherwise specified. Each abbreviation in the examples indicates the following compounds. Methyl methacrylate MMA Methyl acrylate MA Butyl acrylate BuA Allyl methacrylate AMA 1,3-butylene methacrylate BD Styrene St Ethyl acrylate EA Cumene hydroperoxide CHP n-octyl mercaptan NOM

The evaluation of various physical properties in the examples was performed according to the following test methods.

1) Reduced viscosity of thermoplastic polymer 0.1 g of the polymer was dissolved in 100 mL of chloroform.
It was measured at 5 ° C.

2) Tensile Rupture Elongation of Acrylic Film According to JIS C-2318, a tensile test measurement specimen of an acrylic film was prepared, and its tensile fracture elongation at 23 ° C. was measured.

3) Workability An acrylic film laminated veneer or a veneer alone was wound around a metal rod having a diameter of 3 mm, and the presence or absence of cracks was evaluated.

4) Weather resistance An accelerated weather test at 63 ° C. was performed using a weather resistance tester (Sunshine Weatherometer manufactured by Suga Test Instruments Co., Ltd.) to evaluate.

<Example 1> a) Production of thermoplastic polymer (I) A reaction vessel was charged with 200 parts of ion-exchanged water substituted with nitrogen, and 1 part of potassium oleate and 0.3 part of potassium persulfate as emulsifiers were added. I charged. Next, MMA 40 parts, BuA
10 parts and 0.005 part of NOM were charged and placed in a nitrogen atmosphere.
The mixture was stirred at 5 ° C. for 3 hours to complete the polymerization. Continue with M
A monomer mixture composed of 48 parts of MA and 2 parts of BuA was added dropwise over 2 hours, and after the completion of the addition, the mixture was maintained for 2 hours to complete the polymerization. The resulting latex was added to a 0.25% by weight aqueous sulfuric acid solution, and the polymer was subjected to acid coagulation, followed by dehydration, washing and drying to recover a powdery polymer. ) Got. The reduced viscosity of the obtained copolymer was 0.38 L / g.

B) Production of Rubber-Containing Polymer (II) Into a reaction vessel, the following raw material (a) and half the amount of the following raw material (b) are charged and stirred at 80 ° C. for 90 minutes in a nitrogen atmosphere. Polymerization was performed. Thereafter, the other half of the raw material (b) was continuously added over 90 minutes, and polymerization was further performed for 120 minutes to obtain an elastic latex.

The following raw material (c) is added to the elastic latex, and the mixture is stirred.
It was added continuously at 0 ° C. for 45 minutes, and then polymerized continuously at 80 ° C. for 1 hour to obtain a rubber-containing polymer (II) latex. Subsequently, coagulation, coagulation and solidification reactions were performed using calcium chloride, followed by filtration, washing with water and drying to obtain a rubber-containing polymer (II).

Raw material (a) Deionized water 300 parts N-acyl sarcosine acid 1.5 parts Boric acid 1.0 parts Sodium carbonate 0.1 part Sodium formaldehyde sulfoxylate 0.5 parts Ferrous sulfate 0.00024 parts Ethylenediamine Disodium tetraacetate 0.00072 parts Raw material (b) BuA 80.0 parts St 19.0 parts AMA 1.0 part CHP 0.3 parts Raw material (c) Deionized water 5 parts N-acyl sarcosine acid 1.2 parts Raw material (D) MMA 76.6 parts EA 3.2 parts NOM 0.28 parts CHP 0.24 parts (c) Production of acrylic film

The thermoplastic polymer (I) obtained as described above
And rubber-containing polymer (II) and thermoplastic polymer (II
As I), a methyl methacrylate / methyl acrylate copolymer (methyl methacrylate / methyl acrylate = 98 /
2, reduced viscosity 0.06 L / g) using a Henschel mixer at a ratio shown in Table 1 below.

Then, using a 40 mmφ screw type extruder (L / D = 26), the cylinder temperature was set to 200 ° C.
The mixture was melt-kneaded at 260 ° C. and a die temperature of 250 ° C., and pelletized. The pellets are dried at 80 ° C. all day and night.
An acrylic film having a thickness of 50 μm was manufactured using a die. The tensile elongation at break of this film was 82%.

An ethylene-vinyl acetate adhesive (manufactured by Nippon Fuller Co., Ltd., JW
-2022) was applied in an amount of about 120 g / m ² , and bonded to an acrylic film using a roll press to obtain an acrylic film laminated veneer having a deep and high-quality feel.

When the processability of the acrylic film laminated veneer was evaluated, no cracks occurred and good processability was exhibited. Further, when an accelerated weathering test was performed, discoloration was observed in 250 hours.

Example 2 At the time of producing an acrylic film,
An acrylic film having a thickness of 50 μm was produced in the same manner as in Example 1 except that an ultraviolet absorber (trade name: Tinuvin P, manufactured by Ciba Specialty Chemicals Co., Ltd.) was added in the composition shown in Table 1. The tensile elongation at break of this film is 8
3%.

An acrylic film laminated veneer was produced in the same manner as in Example 1 except that this acrylic film was used. When this workability was evaluated, no cracks occurred and good workability was exhibited. Further, when an accelerated weathering test was performed, almost no discoloration was observed even after 1000 hours.

Example 3 The rubber-containing polymer (II) shown in Example 1 and a methyl methacrylate / methyl acrylate copolymer (methyl methacrylate / methyl acrylate) were used as the thermoplastic polymer (III). = 98/2, reduced viscosity 0.
06 L / g) with a Henschel mixer at a ratio shown in Table 1 below.

Thereafter, an acrylic film laminated veneer was manufactured in the same manner as in Example 1. When the workability of this acrylic film laminated veneer was evaluated, no cracks occurred and good workability was exhibited. The tensile elongation at break of the acrylic film itself was 90%.

Example 4 d) Production of Multilayer Polymer (IV) The following materials (e) were charged into a reaction vessel and stirred under a nitrogen atmosphere, and then 1.6 parts of MMA, 8 parts of BuA, and 0.4 parts of BD were added. ,
A mixture consisting of 0.1 parts AMA and 0.04 parts CHP was charged. After the temperature was raised to 70 ° C., the reaction was continued for 60 minutes.

Raw material (e) Deionized water 250 parts N-acyl sarcosine acid 2 parts Boric acid 1 part Sodium carbonate 0.1 part Sodium formaldehyde sulfoxylate 0.5 parts Ferrous sulfate 0.00024 parts Disodium ethylenediaminetetraacetate 0.000072 copies

Subsequently, 1.5 parts of MMA, 22.5 BuA
Parts, 1.0 part of BD, 0.25 parts of AMA and 0.05 parts of CHP were added dropwise for 60 minutes.

Subsequently, a mixture of 5 parts of MMA, 5 parts of BuA and 0.1 part of AMA was reacted, and finally a mixture of
A monomer mixture having a composition of 25 parts and 2.75 parts of BuA was reacted to obtain a multilayer polymer (IV) latex. Subsequently, coagulation, coagulation and solidification reactions were performed using calcium chloride, followed by filtration, washing with water and drying to obtain a multilayer polymer (IV).

An acrylic film laminated veneer was produced in the same manner as in Example 1 using this multilayer structure polymer (IV). When this workability was evaluated, no cracks occurred and good workability was exhibited. The tensile elongation at break of the acrylic film itself is 1
20%.

<Comparative Example 1> When the workability of the veneer plate alone was evaluated, it was found that the veneer plate cracked and the workability was poor.

Comparative Example 2 An acrylic film having a thickness of 50 μm was produced in the same manner as in Example 1 except that the composition was changed to the composition shown in Table 1. The tensile elongation at break of this film is 4
It was 0%.

An acrylic film laminated veneer was produced in the same manner as in Example 1 except that this acrylic film was used. When this workability was evaluated, cracks occurred and sufficient workability was not obtained.

[0048]

[Table 1]

[0049]

As described above, the veneer of the present invention is
Since the acrylic film having a tensile elongation at break of 80% or more at 23 ° C. is laminated, the veneer is a low-cost veneer which is excellent in a deep, high-grade appearance, has good workability and durability, and is low in cost.

Further, if an acrylic film containing an ultraviolet absorber is used, a veneer excellent in weather resistance can be obtained.

Claims (3)

[Claims] 1. A veneer laminated with an acrylic film having a tensile breaking elongation at 23 ° C. of 80% or more. 2. The veneer according to claim 1, wherein the acrylic film contains an ultraviolet absorber. 3. The veneer according to claim 1, wherein the thickness of the acrylic film is 15 μm or more and 300 μm or less.