JPH0238002A - Reinforced decorative material - Google Patents

Abstract

PURPOSE:To maintain the woody feeling of a decorative veneer, raise the hardness thereof and improve the anti-cracking property by impregnating a reinforcing agent to a specified thickness woody material, and laminating a specified thickness non-impregnated decorative veneer on at least one side surface thereof, and then press-molding them subsequently. CONSTITUTION:The title material can be obtained in the manner that a decorative veneer with a thickness of 0.2-2mm is laminated, and then press-molded on at least one side surface of a reinforcing agent-impregnated woody material. The woody material used herein is cited by a veneer, sawn board, plywood and the like, each having a thickness of 2-100mm, as example. The reinforcing agent employed herein may desirably be of a type wherein it is liquid under an ordinary temperature, and can be impregnated into a decorative veneer, and besides, can also reinforce the veneer, furthermore, it is preferably of viscosity of 500cps or less. For instance, synthetic resin using usually for reinforcing decorative material can be cited, such as alkyd resin, epoxy resin and the like. Upon impregnating a reinforcing agent into a woody material, it is desirable to employ decompressive and compressive impregnation. And, the impregnating quantity of the reinforcing agent is preferable in the rate of reinforcing agent 20-500pts.wt. to woody material 100pts.wt. Press molding can be performed by cold press or hot press, however, it may desirably be of a hot press mold in order to carry out the mold in short time efficiently.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a reinforced decorative material that maintains a wood texture on the surface and is used as building materials such as walls, ceilings, columns, and floors of houses, furniture, and fittings. It is something that will be done.

[Conventional technology]

BACKGROUND ART It has been known to bond a decorative veneer with beautiful wood grain, such as Japanese cypress, to plywood to make a decorative wood board. The decorative board produced by this method naturally has woody properties, but it is difficult to use on floors, etc., which have harsh environments, because it has poor hardness, abrasion resistance, durability, etc.

Therefore, in order to provide the above-mentioned performance, methods have been proposed in which the decorative veneer is dipped in synthetic resin, or the veneer is fully coated with resin, and this is laminated on the surface of plywood and heated and compressed to create a reinforced decorative board. There is. In particular, with the development of technology for impregnating wood with resin under reduced or pressurized conditions, composites of wood and synthetic resins (wood-plastic co-production, hereafter abbreviated as wPC) have become increasingly popular. . However, although the strength of the surface veneer increases significantly due to these changes,
With either method, the original color and feel of natural wood is often lost, leaving the wood with a printed appearance. In addition, since only the decorative veneer is impregnated and cured, cracks are likely to occur during molding due to the difference in shrinkage rate from plywood, and crack resistance in repeated cold and heat tests is also poor. For these reasons, it has been extremely difficult to obtain a nine-reinforced decorative board that maintains the wood texture.

[Problem to be solved by the invention]

The present invention provides a reinforced decorative material in which plywood and decorative veneer are laminated to maintain the original wood feel of the decorative veneer, and which has high hardness and good crack resistance.

[Means to solve the problem]

The present invention strengthens the wood material by laminating an unimpregnated decorative veneer on a wood material impregnated with a reinforcing agent and compression-molding it, and also impregnates the wood material and causes the reinforcing agent to seep out onto the surface of the decorative veneer. By soaking it into the veneer from the back side and curing it, we were able to strengthen the decorative veneer without damaging the wood texture and solve the above problem.

Examples of wood materials used in the present invention include wood materials such as veneer, sawn board, plywood, particle bead, and fiber &de, and composite materials using these materials for the surface layer.

The reinforcing agent used in the present invention may be any reinforcing agent as long as it is liquid at room temperature, can be impregnated into a decorative veneer, and can strengthen the veneer, and preferably has a viscosity of 500 cps or less. Examples of reinforcing agents include alkyd resins, epoxy resins, polybutadiene resins, urethane resins,
Synthetic resins commonly used for reinforced decorative materials such as unsaturated polyester resins, vinyl ester resins, diallyl phthalate resins, area resins, and melamine resins can be mentioned, and the resin can be appropriately selected from among them. Reactive monomers can also be used as reinforcing agents, and examples of such reactive monomers include vinyl monomers, (meth)acrylic acid monomers, (meth)acrylic acid salt monomers, and the like. Further, an initiator or accelerator may be added for the purpose of promoting the reaction.

Methods for impregnating wood materials with reinforcing agents include known dipping methods,
A vacuum impregnation method, a pressurization impregnation method, and a vacuum pressure impregnation method can be used, but the vacuum pressure impregnation method is preferable for performing the impregnation efficiently in a short time. In addition, the amount of impregnation of the reinforcing agent is 1
00 parts by weight of the reinforcing agent is preferably 20 to 500 parts by weight, more preferably 40 to 200 parts by weight. If the amount of impregnation is less than 20 parts by weight, sufficient hardness and abrasion resistance may not be obtained due to insufficient transfer of the reinforcing agent from the wood material to the decorative veneer during molding, and if it is more than 500 parts by weight, reinforcement will not be achieved. The agent often seeps onto the surface of the decorative veneer, significantly damaging the wood feel of the veneer.

The reinforced decorative material of the present invention is obtained by laminating a decorative veneer with a thickness of 0.2 to 2 strips on at least one side of a wood material impregnated with a reinforcing agent, and compression molding the laminated decorative veneer.

At this time, the decorative veneer that can be used is a beautiful wooden veneer used for the surface layer, and may be rotary veneer, sliced veneer, or sawn veneer, and the type of material is not particularly limited.
Red pine, rainbow pine, larch, koyamaki, Spanish mackerel,
Domestic coniferous trees such as cedar, hemlock, fir, nezuko, cypress, biva, etc. may be used, or imported coniferous trees such as Japanese pine, Canadian spruce, loblolly, pine, Douglas fir, and radiata pine may be used. Domestic broad-leaved trees such as asada, Japanese maple, macanipa, tungsten, camphor, zelkova, cypress, white oak, cypress, sen, alder, beech, oak, etc., as well as lauans such as walnut, ebony, rosewood, mahocanilamine, yellow meranti, etc. Imported broadleaf such as rosewood may also be used. The thickness of the plate ranges from 0.2 to 21,111 mm, preferably from 0.4 to 1 mm. It's Owm. The plate thickness is 0.2■
If it is less than 2.0 m thick, the reinforcing agent may seep out and impair the wood texture, and if it is thicker than 2.0 m, the reinforcing agent will not transfer sufficiently and sufficient hardness and wear resistance will not be obtained. Further, the decorative veneer may be subjected to consolidation treatment for the purpose of improving impregnability and increasing hardness.

For compression molding when manufacturing the reinforced cosmetic material 'It-M' of the present invention, known molding methods using F-mf press roll press, belt press, etc. can be used, and cold pressure or hot pressure can be used. However, in order to perform this molding efficiently in a short time, hot pressure molding is preferable.The molding conditions vary depending on the combination of reinforcing agent, decorative veneer, and wood material used, and the pressing temperature is 20°C (room temperature) ~ 150℃, press pressure is contact pressure ~3
okg/crII2, and the pressing time is 5 minutes to 3 days, but the pressure conditions can be roughly divided into two. One is 4 to 10 Yu/cfR2 when using a decorative hardwood veneer with tracheids and a dense tissue, and the other is a softwood veneer with tracheids and easy to seep out of the reinforcing agent. In the case of a decorative veneer, a contact pressure of ~5 kg7cm2 is preferable. Furthermore, in order to further reduce the degree of leaching, a wood material impregnated with a reinforcing agent may be dried with hot air to form a B stage.

By the way, in the conventional method of laminating impregnated decorative veneer on unimpregnated wood material and compression molding, the reinforcing agent impregnated into the decorative veneer is highly impregnated (decorative veneer) in order to obtain sufficient hardness and wear resistance. It is necessary to add at least 90 parts of the reinforcing agent per 100 parts of the board, and although this impregnation improves the transparency of the veneer, it changes the original color tone of the veneer. or,
Because the reinforcing agent seeps out of the decorative veneer during molding, the surface of the veneer also feels like plastic. Furthermore, since only the decorative veneer is impregnated and strengthened, the shrinkage rates of the decorative veneer and the wood material are significantly different, the incidence of cracking during molding is high, and the crack resistance in repeated cold and heat tests is also poor.

In the case of the present invention, the decorative veneer is strengthened by a reinforcing agent that oozes out from the impregnated base material during compression molding, penetrates from the back side of the veneer, and hardens. At this time, appropriate molding conditions are selected so that the reinforcing agent does not seep into the surface of the decorative veneer, so that the feel of the surface of the veneer does not change even after strengthening. Even without reinforcing the veneer by infiltrating the veneer with a reinforcing agent to the extent that the color tone of the decorative veneer changes, the hardness and abrasion resistance are sufficient due to the mutual effect with the reinforced impregnated base material. Become something. Furthermore, since the reinforced decorative material of the present invention strengthens both the decorative veneer and the wood material, the difference in shrinkage rate is smaller than that of conventional materials, and the cracking rate during molding is also low, making it resistant to cold and heat. The crack resistance in repeated tests is also improved.

〔Example〕

The present invention will be further explained below with reference to Examples.

Example 1 An impregnation container equipped with a pressure reduction device and a pressure device has a length of 50 ctn.
, six pieces of plywood with a width of 12α and a thickness of 9 were inserted.

Next, unsaturated polyester (Polylite C8-810 manufactured by Dainippon Ink and Chemicals Co., Ltd.): Styrene monomer:
A reinforcing agent mixed with benzoyl peroxide in a weight ratio of 60:40:1 and having a viscosity of 50 cps (at 25° C.) was placed in an impregnating container and the plywood was completely immersed. Next, operate the pressure reducing device to reduce the pressure inside the impregnation container to a degree of vacuum of 40+aHg, and keep it there for 1 hour.

Next, after returning to normal pressure, operate the pressurizing device to a pressure of 10 kg/
Pressure was applied to crn and maintained for 1 hour. The pressure was returned to normal again, the plywood was taken out, and a layer of unimpregnated beech decorative plywood with a length of 50 cW1, a width of 12 cm, and a thickness of 0.7 cm was laminated on the surface of the plywood, and a press pressure of 6'Kg / cFn2 A reinforced decorative material that maintained a woody feel was obtained by hot-pressing molding at a press temperature of 125° C. and a press time of 13 minutes. We carefully measured the hardness, wear resistance, crack resistance, and appearance of this material. Table 1 shows the measurement results.

Comparative Example 1 An unimpregnated beech decorative veneer used in Example 1 was attached to an unimpregnated plywood using a water-based vinyl urethane adhesive (Dainippon Ink Kagaku Kogyo Agricultural Dickpond V-255: Fickpinto M-3=
A laminated beech decorative material was obtained using a weight ratio of 9:1 and approximately 10,000 cps). Although this beech decorative material has a woody feel, its hardness and abrasion resistance are significantly inferior to the reinforced decorative material of Example 1. Hardness as in Example 1,
Table 1 shows the results of measurements regarding abrasion resistance, crack resistance, and appearance.

Comparative Example 2 Pressure reduction device, pressurization device Six beech decorative veneers similar to those in Example 1 were placed in a container impregnated with gold bias. Next, the reinforcing agent of Example 1 was placed in an impregnating container, and the decorative veneer was completely immersed, and subjected to reduced pressure and pressure treatment under the same conditions as Example 1. The obtained impregnated decorative veneer was laminated on a plywood board with a length of 5ocrn, a width of 12crn, and a thickness of 9cm, and pressed using a flat plate press at a pressing pressure of 6kg7.
(2) A reinforced decorative material was obtained by hot-press molding under the conditions of a press temperature of 125° C. and a press time of 13 minutes. This reinforced decorative material lacks the woody feel of veneer, and its crack resistance is extremely poor.

As in Example 1, the hardness, abrasion resistance, crack resistance, and appearance were measured and the results are shown in Table 1.

Example 2 Pressure reducing device, pressurizing device, gold bias and impregnation container length 30 cm
, 6 pieces of plywood 10m wide and 9 sheets thick were inserted.

Next, vinyl ester (Dainippon Ink & Chemicals Co., Ltd. Daycrite UE3505): methyl methacrylate monomer: penzoylnochloride oxide; 70:30
:Blended at a weight ratio of 1, with a viscosity of 7°cps (25°C)
The reinforcing agent was placed in the impregnating container and the plywood was completely immersed. Next, operate the pressure reducing device to reduce the pressure inside the impregnation container to 50 degrees.
A vacuum was applied to mHg and maintained for 30 minutes. Thereafter, after the pressure was returned to normal, the pressure device was operated to increase the pressure to 10 kg/cIn2 and maintain it for 30 minutes.

After returning to normal pressure again, the plywood was completely destroyed, and a length of 30 mm was placed on this surface.
crR, 12 widths, 0.6cm thick unimpregnated cypress decorative veneers are laminated, and press pressure cuff klil/c is made using a flat plate press.
A reinforced decorative material that maintained a woody feel was obtained by hot-pressing molding under the following conditions: m2, press temperature: 130° C., and press time: 13 minutes. Table 2 shows the results of measuring the hardness, abrasion resistance, and appearance of this material.

Comparative Example 3 An unimpregnated cypress decorative veneer similar to Example 2 was bonded to unimpregnated plywood using a water-based vinyl urethane adhesive (Dainippon Ink & Chemicals).
A cypress decorative material was obtained by bonding using a 9:1 weight ratio of Dick Punto V-255 to Dick Punt M-3 (9:1). Although this decorative material had a woody feel, its hardness and abrasion resistance were significantly inferior to the reinforced decorative material of Example 2. Table 2 shows the results measured in the same manner as in Example 2.

Comparative Example 4 Six volumes of cypress decorative veneer similar to Example 2 were placed in an impregnation container equipped with a pressure reduction device and a lateral pressure device i. Next, the reinforcing agent of Example 2 was placed in an impregnation container and the decorative veneer was completely immersed.
It was subjected to pressure reduction and pressure treatment under the same conditions as . The obtained nine-impregnated decorative veneer was laminated on a plywood board with a length of 30an, a width of 12crR, and a thickness of 9cm2, and was pressed into a press cuff of 9/cm2 using a flat plate press.
A reinforced decorative material was obtained by hot-press molding at a press temperature of 130° C. and a press time of 13 minutes. This reinforced decorative material lacks the woody feel of veneer and has extremely poor crack resistance.

Table 2 shows the results measured in the same manner as in Example 2.

Wood material (Examples 1 and 2) or decorative veneer (Comparative example 2.4)
) Parts by weight of the reinforcing agent after impregnation based on 100 parts by weight*2 Visually inspect the surface of the decorative veneer after molding.

*3 Percoll hardness meter & 936 tl - Number of measurements using: 40
Measured by the average value and deviation of.

*4 Full use of Toyo Seiki Co., Ltd. beauty taper wear tester,
Sandpaper AA400, load 25 to 9, rotation speed 3
The wear loss was measured under the condition of 00 rotations.

Car 5 After molding, it was left standing for one day and night and then visually measured.

$6 Measure the number of cracks after 2 cycles of the JAS cold/heat repeated test.

*1 and 29'' / / [Effects of the Invention] The reinforced decorative material of the present invention is obtained by laminating and compression molding unimpregnated decorative veneer with beautiful wood grain on a wooden material fully impregnated with a reinforcing agent. Maintains the feel of the material of the board itself.
As it is, it has properties such as hardness. For example, when used as a diagnostic makeup veneer, the hardness of the unreinforced veneer (Percoll hardness tester A936) is O~5, whereas the hardness of the reinforced veneer can be 50 or higher. The reinforced decorative material obtained in this manner can be used not only for walls and ceilings, but also for floors, etc., which are used in harsh environments, for example, when used in houses. In addition, this reinforced decorative material has sufficient wood windows and is extremely natural, so even residents who are sensitive to wood feel will not feel any strangeness at all.

Agent: Katsutoshi Takahashi Procedural amendment stamp button: June 1999, Date of 1986, Patent Application No. 186756 2, Name of the invention: Reinforced cosmetic material 3, Relationship with the case of the person making the amendment Patent applicant 3-35-58 Sakashita, Itabashi-ku, Tokyo 174 (28
8) Dainippon Ink and Chemicals Co., Ltd. Representative: Shigeru Kuni Mura 4, Agent Address: 6-7-20, 3-7 Nihonbashi, Chuo-ku, Tokyo 103 Contents of the amendment (11 Specification, page 5, line 11, Correct "pa" to "hiba".

(2) In the same book, page 5, line 15, "Makanipa" is corrected to "Makamba."

(3) "Daylight" in the second line of page 11 of the same book is replaced with "
Corrected to "Dick Light".

(4) “〜〜〜〜” in Table 1, page 13 of the same book
～5. Subject of correction～”

Claims (1)

[Claims] A wood material with a thickness of 2 to 100 mm is impregnated with a reinforcing agent, and an unimpregnated decorative veneer with a thickness of 0.2 to 2 mm is laminated on at least one side of the wood material, and the wood texture is maintained on the surface by compression molding. A reinforced cosmetic material.