JP4830900B2 - Building board and manufacturing method of building board - Google Patents

Building board and manufacturing method of building board

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JP4830900B2
JP4830900B2 JP2007039844A JP2007039844A JP4830900B2 JP 4830900 B2 JP4830900 B2 JP 4830900B2 JP 2007039844 A JP2007039844 A JP 2007039844A JP 2007039844 A JP2007039844 A JP 2007039844A JP 4830900 B2 JP4830900 B2 JP 4830900B2
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wood
polymeric mdi
building board
water
based adhesive
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雅博 中川
伸一 鈴木
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Panasonic Corp
Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Description

本発明は、床、壁、天井、ドア、造作等の内装材、家具やキッチン等の箱物部材、ウッドデッキやフェンス等のエクステリア部材などに用いられる建築板及びその製造方法に関するものである。   The present invention relates to a building board used for interior materials such as floors, walls, ceilings, doors, and structures, box members such as furniture and kitchens, exterior members such as wood decks and fences, and a method for manufacturing the same.

木材で形成される上記のような建築板において、表面の硬度や耐傷性などの表面強度が要求される場合が多い。例えば床材は、キャスターや落下物などによって損傷が生じ易いので、表面強度が特に高く要求される。またドアや壁なども物が当たることによって凹みなどが生じ易いため、同様に表面強度が高く要求される。このため、従来から木材の表面を強化する方法が各種提案されている。   In the above-mentioned building board made of wood, surface strength such as surface hardness and scratch resistance is often required. For example, floor materials are required to have a particularly high surface strength because they are easily damaged by casters or falling objects. Also, since doors and walls are easily dented by hitting objects, the surface strength is similarly required to be high. For this reason, various methods for reinforcing the surface of wood have been proposed.

例えば、古くは、との粉等のフィラーとバインダーとの混合物を木材の表面に刷り込んで充填する方法があるが、この方法では極表面のみが硬くなり、キャスターのような荷重ストレスには効果が期待できない。   For example, in the old days, there is a method in which a mixture of a filler such as powder and a binder is imprinted on the surface of wood and filled, but this method only hardens the extreme surface and is effective for load stress such as casters. I can't expect it.

また最近では、木材に樹脂を含浸して硬化させたり、木材の表面に紙を貼ってこの紙に樹脂を含浸・硬化させたりする方法や、木材の表面にプラスチックシート、MDF、HDF、樹脂含浸シート等の硬質材料を貼る方法などが実施されているが、これらの方法は高い強度を期待することができる反面、工数や材料コストなどがかかり、製造コストが高くなるという問題がある。   Recently, wood is impregnated with resin and cured, or paper is affixed to the surface of wood and resin is impregnated and cured, or plastic sheet, MDF, HDF, resin impregnation on the surface of wood. A method of applying a hard material such as a sheet has been practiced. However, these methods can be expected to have high strength, but have a problem that man-hours, material costs, and the like are increased and manufacturing costs are increased.

また木材の表面を圧密化する方法もあるが、この場合には材料体積減が大きいので、材料コストが高くなるという問題がある。   There is also a method of consolidating the surface of the wood, but in this case there is a problem that the material cost increases because the material volume is greatly reduced.

さらに木材の表面に硬質塗装を行なう方法があるが、この方法では表面の鉛筆硬度を向上する程度の効果はあるが、床材等の建材に必要とされるキャスターや落下物に対する損傷に対する強度を期待することはできない。   In addition, there is a method of hard coating on the surface of wood, but this method has the effect of improving the pencil hardness of the surface, but the strength against damage to casters and falling objects required for building materials such as flooring. I can't expect.

また、特許文献1には、木材の表面にヘキサメチレンジイソシアネートなどのイソシアネートを含浸させて硬化させることによって、木材の表層を改質する方法が提案されている。しかしこのものでは、イソシアネートの含浸を均一にするために、木材の表面を圧密化する工程が必要であり、上記の圧密化の方法と同様な問題があると共に、圧密化のための特別な工程によって製造コストが上昇するという問題もあった。
特許第3715982号公報
Patent Document 1 proposes a method for modifying the surface layer of wood by impregnating the surface of wood with an isocyanate such as hexamethylene diisocyanate and curing it. However, in this case, in order to make the isocyanate impregnation uniform, a step of compacting the surface of the wood is necessary, and there are the same problems as the above-mentioned consolidation method, and a special step for consolidation As a result, there is a problem that the manufacturing cost increases.
Japanese Patent No. 3715982

本発明は上記の点に鑑みてなされたものであり、簡単な工程により、低コストで木材の表面の強度を強化した建築板を製造することを目的とするものである。   This invention is made | formed in view of said point, and it aims at manufacturing the building board which strengthened the intensity | strength of the surface of the timber at low cost by a simple process.

本発明に係る建築板の製造方法は、合板又はむく材により構成される木材の表面にポリメリックMDIを塗布し、続いて水系接着剤を塗布し、木材のこの表面に化粧材を重ねた後、木材のこの表面を加熱加圧してポリメリックMDIと水系接着剤を同時に硬化させることを特徴とするものである。 The method for manufacturing a building board according to the present invention comprises applying a polymeric MDI to the surface of a wood made of plywood or a peeling material , subsequently applying a water-based adhesive, and overlaying a decorative material on this surface of the wood, This surface of the wood is heated and pressed to simultaneously cure the polymeric MDI and the water-based adhesive.

ポリメリックMDIは一般に低粘度であり、木材の表面内に良好に浸透させることができるが、続いて塗布される水系接着剤の水分の作用でポリメリックMDIがあまり深く拡散することなく木材の表層に含有されている状態で硬化させることができるものであり、木材の表面を効率的に強化することができるものである。しかもポリメリックMDIや水系接着剤を塗布して加熱加圧するという簡単な工程で、製造コスト安価に木材の表面の強度を強化することができるものである。   Polymeric MDI generally has a low viscosity and can penetrate well into the surface of wood, but the polymer MDI is not contained in the surface layer of wood without being diffused too deeply by the action of moisture of the water-based adhesive applied subsequently. It can be cured in a state where it is applied, and can effectively reinforce the surface of the wood. Moreover, the strength of the surface of the wood can be enhanced at a low manufacturing cost by a simple process of applying polymeric MDI or a water-based adhesive and heating and pressing.

この発明によれば、木材の表面を強化するためのポリメリックMDIと水系接着剤を利用して、化粧材の接着を行なうことができるものである。   According to the present invention, the decorative material can be bonded using the polymeric MDI and the water-based adhesive for reinforcing the surface of the wood.

また更なる発明は、上記の建築板の製造方法において、木材の表面にポリメリックMDIを塗布するにあたって、離型剤を分散させたポリメリックMDIを塗布することを特徴とするものである。 Still further , in the above method for manufacturing a building board, in applying the polymeric MDI to the surface of the wood, the polymeric MDI in which a release agent is dispersed is applied.

この発明によれば、化粧材の上から熱盤等で加熱加圧するにあたって、ポリメリックMDIが化粧材の表面に染み出しても、熱盤に化粧材が貼り付くことを離型剤で防ぐことができ、製造に支障が生じることがないものである。   According to the present invention, when the pressure is applied to the surface of the decorative material with a heating plate or the like, the release agent prevents the cosmetic material from sticking to the heating plate even if the polymeric MDI oozes out on the surface of the decorative material. It is possible to prevent the production from being hindered.

本発明に係建築板は、上記いずれかの方法で製造されたものであり、表面の強度が高く、キャスターや落下物などに対する耐損傷性が高いものである。 Engaging Ru building board to the present invention has been made in any of the above methods, high strength of the surface is what has high damage resistance against such casters or falling objects.

本発明によれば、木材の表面にポリメリックMDIを塗布することによって、粘度の低いポリメリックMDIを木材の表面内に容易に浸透させ、続いて水系接着剤を塗布することによって、その水分をポリメリックMDIと反応させてポリメリックMDIを増粘させ、ポリメリックMDIが浸透し過ぎて木材の表層より深く拡散しないようにし、この状態で加熱加圧してポリメリックMDIと水系接着剤を同時に硬化させることによって、ポリメリックMDIと水系接着剤の硬化樹脂層を木材の表層に形成することができるものであり、ポリメリックMDIや水系接着剤を塗布して加熱加圧するという簡単な工程で、製造コスト安価に木材の表面の強度を強化することができるものである。   According to the present invention, by applying polymeric MDI to the surface of the wood, the low-viscosity polymeric MDI can be easily penetrated into the surface of the wood, followed by application of a water-based adhesive to remove the moisture. To increase the viscosity of the polymeric MDI so that the polymeric MDI penetrates too much and does not diffuse deeper than the surface layer of the wood. And a hardened resin layer of water-based adhesive can be formed on the surface layer of wood. The strength of the surface of the wood can be reduced at a low cost by a simple process of applying polymeric MDI or water-based adhesive and applying heat and pressure. Can be strengthened.

以下、本発明を実施するための最良の形態を説明する。   Hereinafter, the best mode for carrying out the present invention will be described.

木材の表面を効果的に強化するためには、木材が有する空隙に良好に浸透して充填できることが必要である。そして木材の空隙は細かいうえに不定形であるので、この空隙に良好に浸透させて充填するためには、粘度が低く木材との馴染みが良いことが必要であり、このために本発明ではポリメリックMDIを用いるものである。ポリメリックMDIは次の化学構造式からなるポリメチレンポリフェニルポリイソシアネートであり、100〜200mPa・sec(at25℃)程度の低い粘度を有する液体である。本発明においてポリメリックMDIはそれ単独で用いることができるが、ポリメリックMDIを主成分とし、他の成分を混合した溶液として用いることもできる。   In order to effectively reinforce the surface of the wood, it is necessary to be able to satisfactorily penetrate and fill the voids of the wood. Since the voids in the wood are fine and irregular, it is necessary to have a low viscosity and a good familiarity with the wood in order to satisfactorily penetrate and fill the voids. MDI is used. Polymeric MDI is a polymethylene polyphenyl polyisocyanate having the following chemical structural formula, and is a liquid having a low viscosity of about 100 to 200 mPa · sec (at 25 ° C.). In the present invention, polymeric MDI can be used alone, but it can also be used as a solution in which polymeric MDI is the main component and other components are mixed.

Figure 0004830900
Figure 0004830900

また本発明において水系接着剤としては、水系のものであれば特に限定されることなく使用することができるものであり、例えばゴムラテックスエマルジョンなどを用いることができる。   In the present invention, the water-based adhesive is not particularly limited as long as it is water-based, and for example, a rubber latex emulsion can be used.

木材としては、合板やむく材など任意の木質材を用いることができるものであり、本発明では、まず、この木材の表面にポリメリックMDIを塗布する。ポリメリックMDIの塗布量は、木材の材質や要求される強化性能などに応じて任意設定されるものであり、特に限定されるものでないが、50〜200g/m程度の範囲が好ましい。ポリメリックMDIは木材との馴染みが良く、また低粘度であるので、木材の表面に塗布することによって、木材の表層部内に容易に浸透するものである。 As the wood, any woody material such as plywood or peeler can be used. In the present invention, first, polymeric MDI is applied to the surface of the wood. The coating amount of the polymeric MDI is intended to be any set in accordance with the enhanced performances wood material and requests, although not particularly limited, 50 to 200 g / m 2 in the range of about preferably. Polymeric MDI is familiar to wood and has a low viscosity, so that it easily penetrates into the surface layer of wood when applied to the surface of wood.

尚、ポリメリックMDIの硬化を促進するために、トリエタノールアミン等の硬化促進剤を用いることができる。硬化促進剤は、ポリメリックMDIに直接添加するようにしてもよく、あるいは木材の表面に予め硬化促進剤を塗布しておいてもよく、さらに水系接着剤に添加して使用するようにしてもよい。またポリメリックMDIを木材の表面に過剰に塗布して、余分なものを掻き取るようにしてもよい。このようにすれば均一な塗布量となり、表面の強度向上の効果が安定するものである。さらに、表面強度の向上をより安定化させるため、ポリメリックMDIに一般の湿気硬化型ウレタン接着剤を配合し、粘度調整をするようにしてもよい。但しこの場合、ウレタン接着剤の配合量が多くなると本発明の効果は低下するので、ウレタン接着剤の配合量は全体の6割以下にするのが望ましい。   In order to accelerate the curing of the polymeric MDI, a curing accelerator such as triethanolamine can be used. The curing accelerator may be added directly to the polymeric MDI, or the curing accelerator may be preliminarily applied to the surface of the wood, and further added to the water-based adhesive. . Alternatively, polymeric MDI may be applied excessively on the surface of the wood to scrape off the excess. If it does in this way, it will become a uniform coating amount and the effect of the surface strength improvement will be stabilized. Furthermore, in order to stabilize the improvement of the surface strength, a general moisture curable urethane adhesive may be blended with the polymeric MDI to adjust the viscosity. However, in this case, since the effect of the present invention is reduced when the amount of the urethane adhesive is increased, the amount of the urethane adhesive is desirably 60% or less of the whole.

次に、このように木材の表面にポリメリックMDIを塗布した後、引き続いて木材の表面に水系接着剤を塗布する。水系接着剤の塗布量も特に限定されるものでないが、50〜160g/m程度の範囲が好ましい。ポリメリックMDIは上記のように木材に良好に浸透するが、木材の内部に深く浸透して拡散してしまうと、ポリメリックMDIによって木材の表面の強度を強化する効果が高く得られず、また強度にバラツキが生じる。このため、ポリメリックMDIを塗布した後に、引き続いてこの上に水系接着剤を塗布するものであり、このように水系接着剤を塗布すると、水系接着剤の水分がポリメリックMDIのイソシアネートと反応し、ポリメリックMDIの粘度が高まり、ポリメリックMDIが木材に深く浸透して拡散することを防いで、木材の表層部内にポリメリックMDIを保持させることができるものである。 Next, after applying polymeric MDI to the surface of the wood in this way, a water-based adhesive is subsequently applied to the surface of the wood. The coating amount of the water-based adhesive is not particularly limited, but a range of about 50 to 160 g / m 2 is preferable. Polymeric MDI penetrates well into wood as described above, but if it penetrates deeply into the wood and diffuses, the effect of strengthening the surface of the wood by polymeric MDI cannot be obtained and the strength is increased. Variations occur. For this reason, after applying the polymeric MDI, the aqueous adhesive is subsequently applied thereto. When the aqueous adhesive is applied in this way, the water in the aqueous adhesive reacts with the isocyanate of the polymeric MDI, and the polymeric The viscosity of the MDI is increased, the polymeric MDI is prevented from deeply penetrating into the wood and diffusing, and the polymeric MDI can be held in the surface layer portion of the wood.

従って、ポリメリックMDIを塗布した後、長時間を経過した後に水系接着剤を塗布してもこのような効果を得ることができないものであり、ポリメリックMDIを塗布した後、20分以内に水系接着剤の塗布を行なうのが望ましい。また、ポリメリックMDIと水系接着剤を混合して使用すると、混合後20分程度でポリメリックMDIの粘度が高くなり過ぎて、木材の表層部内に浸透させることができなくなるので、このような混合使用は不可である。   Accordingly, even if a long time has passed after applying the polymeric MDI, it is impossible to obtain such an effect even if the aqueous adhesive is applied, and within 20 minutes after applying the polymeric MDI, It is desirable to apply. In addition, when polymeric MDI and water-based adhesive are mixed and used, the viscosity of polymeric MDI becomes too high in about 20 minutes after mixing, and cannot be permeated into the surface layer of wood. It is impossible.

上記のように木材の表面にポリメリックMDIと水系接着剤を塗布した後、木材の表面を熱盤などでプレスして加熱加圧することによって、木材の表層部に浸透させたポリメリックMDIと水系接着剤を硬化させる。ポリメリックMDIは水系接着剤に含有される水分の作用で容易に硬化する。ポリメリックMDIが水分の作用で硬化する際に、炭酸ガスが発生するが、ポリメリックMDIに水を混合した場合のような急激な炭酸ガスの発生ではないので、パンク不良のような問題は発生しない。加熱加圧の条件は特に限定されるものではないが、温度100〜140℃、圧力0.2〜1.5MPa、時間1〜5分の範囲に設定するのが好ましい。   Polymeric MDI and water-based adhesive permeated into the surface layer of wood by applying polymeric MDI and water-based adhesive to the surface of the wood as described above, and then pressing the surface of the wood with a hot platen and heating and pressing. Is cured. Polymeric MDI is easily cured by the action of moisture contained in the water-based adhesive. Carbonic acid gas is generated when the polymeric MDI is cured by the action of moisture, but since carbon dioxide gas is not generated as rapidly as when water is mixed with the polymeric MDI, problems such as puncture failure do not occur. The heating and pressurizing conditions are not particularly limited, but it is preferable to set the temperature to 100 to 140 ° C., the pressure 0.2 to 1.5 MPa, and the time 1 to 5 minutes.

このようにして、木材1の表層部内にポリメリックMDIや水系接着剤からなる硬化樹脂層2を設けて形成される図1(a)のような建築板を得ることができるものである。木材1の表層部の硬化樹脂層2はポリメリックMDIが硬化した硬質ポリウレタンによって主として形成されるものであり、表面硬度や耐傷性などの表面強度が高い建築板を得ることができるものである。   In this way, a building board as shown in FIG. 1A, which is formed by providing a cured resin layer 2 made of polymeric MDI or an aqueous adhesive in the surface layer portion of the wood 1, can be obtained. The cured resin layer 2 in the surface layer portion of the wood 1 is mainly formed by hard polyurethane obtained by curing polymeric MDI, and can obtain a building board having high surface strength such as surface hardness and scratch resistance.

また、上記のように木材の表面にポリメリックMDIと水系接着剤を塗布した後、木材のこの表面に化粧材を重ね、この状態で上記と同様に加熱加圧を行なうようにしてもよい。化粧材としては、木質のスライス単板や、紙、樹脂化粧シートなど任意のものを用いることができる。このようにポリメリックMDIと水系接着剤を塗布した表面に化粧材を重ねて加熱加圧することによって、ポリメリックMDIや水系接着剤を利用して化粧材の貼り付けを行なうことができるものであり、化粧材の接着工程を兼用することができるものである。図1(b)に木材1の表面に化粧材3を貼った建築板を示す。   Alternatively, after applying polymeric MDI and a water-based adhesive to the surface of the wood as described above, a decorative material may be stacked on the surface of the wood, and in this state, heating and pressing may be performed in the same manner as described above. As the decorative material, any material such as a wood slice veneer, paper, and a resin decorative sheet can be used. In this way, a cosmetic material can be applied using a polymeric MDI or an aqueous adhesive by applying a cosmetic material on the surface coated with the polymeric MDI and an aqueous adhesive and applying heat and pressure. It can also be used as a material bonding step. FIG. 1B shows a building board in which a decorative material 3 is pasted on the surface of the wood 1.

ここで、上記のように木材の表面にポリメリックMDIと水系接着剤を塗布した後に熱盤で加熱加圧するにあたって、加熱加圧条件によっては熱盤にポリメリックMDIが付着するおそれがある。特に木材の表面に化粧材を重ねた状態で加熱加圧する場合には、ポリメリックMDIが化粧材を浸透して表面に染み出し、化粧材の表面を熱盤で加熱加圧する際にポリメリックMDIが熱盤に接着して化粧材が熱盤に貼り付き、熱盤を離型することが困難になり、場合によっては化粧材が木材から剥がれるおそれがある。 Here, when the polymer MDI and the water-based adhesive are applied to the surface of the wood as described above and then heated and pressurized with a hot platen, the polymeric MDI may adhere to the hot plate depending on the heating and pressing conditions. In particular, when heating and pressurizing in a state of overlapping the decorative material to the surface of the wood, poly Meri click MDI exudes to the surface to penetrate the decorative material, poly surface of the decorative material during hot pressing by heating platen Meri-click MDI is with a decorative material adhered to the heating plate is bonded to the heating plate, it is difficult to the heating plate is released, in some cases there is a possibility that the decorative material is peeled off from the wood.

そこでこの場合には、ポリメリックMDIに離型剤を分散し、この離型剤を分散したポリメリックMDIを木材の表面に塗布するようにするのがよい。離型剤としては、ポリエチレンワックスエマルジョンなどのワックスエマルジョンを用いることができる。またポリメリックMDIに対する離型剤の添加量は、ポリメリックMDI100質量部に対して1〜5質量部の範囲が好ましい。   Therefore, in this case, it is preferable to disperse the release agent in the polymeric MDI and apply the polymeric MDI in which the release agent is dispersed to the surface of the wood. As the mold release agent, a wax emulsion such as a polyethylene wax emulsion can be used. The amount of the release agent added to the polymeric MDI is preferably in the range of 1 to 5 parts by mass with respect to 100 parts by mass of the polymeric MDI.

そして木材の表面に離型剤を分散したポリメリックMDIを塗布し、続いて水系接着剤を塗布し、木材のこの表面に化粧材を重ねた後、熱盤で加熱加圧するにあたって、ポリメリックMDIが化粧材を浸透して表面に染み出しても、離型剤のワックスエマルジョンも加熱加圧時に水蒸気とともに化粧材を透過して表面に出てくるものであり、分子量の大きなポリメリックMDIが離型剤によって包まれる。このようにポリメリックMDIを包み込む離型剤の離型効果によって、熱盤にポリメリックMDIが付着することを防ぐことができるものであり、熱盤にポリメリックMDIが接着して化粧材が熱盤に貼り付くことを防ぐことができ、加熱加圧後に熱盤を離型する際に、熱盤を離型することが困難になったり、化粧材が木材から剥がれたりすることを防止することができるものである。 Then, apply polymeric MDI with a release agent dispersed on the surface of the wood, then apply a water-based adhesive, overlay a cosmetic material on this surface of the wood, and then heat and press with a hot platen. Even if the material penetrates and oozes out to the surface, the wax emulsion of the release agent also penetrates the cosmetic material together with water vapor during heating and pressurization and emerges on the surface. Polymeric MDI having a large molecular weight is caused by the release agent. Wrapped. This way polymeric MDI the enveloping releasing effect of the release agent, which can prevent the polymeric MDI in the heating plate is attached, the heating plate on poly Meri click MDI adheres to the decorative material is heat It is possible to prevent sticking to the board, and when releasing the hot board after heating and pressurization, it is difficult to release the hot board or to prevent the decorative material from peeling off from the wood. It is something that can be done.

次に、本発明を実施例によって具体的に説明する。   Next, the present invention will be specifically described with reference to examples.

(実施例1)
木材として、厚み12mmの表面ラワン合板を用いた。そして木材の表面にポリメリックMDI(三井化学ポリウレタン株式会社製「コスモネートM−100」)を100g/mの塗布量で塗布した。
Example 1
A surface lauan plywood having a thickness of 12 mm was used as the wood. Polymeric MDI (“Cosmonate M-100” manufactured by Mitsui Chemicals Polyurethane Co., Ltd.) was applied to the surface of the wood at a coating amount of 100 g / m 2 .

次に、水系接着剤としてゴムラテックスエマルジョン(株式会社サンベーク社製の「NM591K」と「C−20」を7:3の質量比で混合)を用い、ポリメリックMDIを塗布した直後(約3秒後)に、この水系接着剤を木材の表面に110g/mの塗布量で塗布した。 Next, a rubber latex emulsion (mixed with “NM591K” and “C-20” manufactured by Sunbake Co., Ltd. at a mass ratio of 7: 3) was used as an aqueous adhesive, and immediately after applying polymeric MDI (after about 3 seconds) The aqueous adhesive was applied to the surface of the wood at a coating amount of 110 g / m 2 .

このようにポリメリックMDIと水系接着剤を塗布した後、木材を熱盤の間にセットし、120℃、0.8MPa、3分間の条件で加熱加圧することによって、ポリメリックMDIと水系接着剤を硬化させ、表面を強化した建築板を得た。   After applying polymeric MDI and water-based adhesive in this way, set the wood between hot plates, and heat and press at 120 ° C, 0.8 MPa for 3 minutes to cure the polymeric MDI and water-based adhesive. To obtain a building board with a reinforced surface.

(実施例2)
実施例1と同様にして木材の表面にポリメリックMDIと水系接着剤を塗布した後、なら材のスライス単板からなる厚み0.3mmの化粧材を木材の表面に重ね、これを熱盤の間にセットして実施例1と同様に加熱加圧することによって、化粧材付の建築板を得た。
(Example 2)
In the same manner as in Example 1, after applying polymeric MDI and a water-based adhesive to the surface of the wood, a 0.3 mm thick decorative material made of sliced single plate of material is stacked on the surface of the wood, and this is placed between the hot plates. The building board with a decorative material was obtained by heating and pressing in the same manner as in Example 1.

(比較例1)
実施例2において、ポリメリックMDIを塗布せず、水系接着剤のみを塗布するようにした。その他は、実施例2と同様にして化粧材付の建築板を得た。
(Comparative Example 1)
In Example 2, the polymeric MDI was not applied, but only the water-based adhesive was applied. Others were the same as in Example 2 to obtain a building board with a decorative material.

(比較例2)
実施例1で用いたポリメリックMDIと水系接着剤を3.5:5の質量比で混合し、この混合溶液を木材の表面に220g/mの塗布量で塗布するようした。その他は、実施例2と同様にして化粧材付の建築板を得た。
(Comparative Example 2)
The polymeric MDI used in Example 1 and an aqueous adhesive were mixed at a mass ratio of 3.5: 5, and this mixed solution was applied to the surface of wood at a coating amount of 220 g / m 2 . Others were the same as in Example 2 to obtain a building board with a decorative material.

(比較例3)
木材の表面に実施例1と同様にポリメリックMDIを塗布した。次に1時間経過した後に、この上に実施例1と同様に水系接着剤を塗布するようにした。その他は、実施例2と同様にして化粧材付の建築板を得た。
(Comparative Example 3)
Polymeric MDI was applied to the surface of the wood in the same manner as in Example 1. Next, after 1 hour had passed, a water-based adhesive was applied thereon as in Example 1. Others were the same as in Example 2 to obtain a building board with a decorative material.

上記のように実施例1〜2及び比較例1〜3で得た建築板を用い、その強化した表面の上に25kgの荷重をかけた直径50mmの金属製キャスターを1000往復走行させ、最大凹み量を測定した。結果を表1に示す。   Using the building boards obtained in Examples 1 and 2 and Comparative Examples 1 to 3 as described above, a metal caster with a diameter of 50 mm with a load of 25 kg applied on the reinforced surface traveled 1000 times and the maximum dent. The amount was measured. The results are shown in Table 1.

Figure 0004830900
Figure 0004830900

表1にみられるように各実施例のものは、最大凹み量が小さく、表面の強度が高いことが確認された。   As can be seen in Table 1, it was confirmed that each example had a small maximum dent amount and a high surface strength.

(実施例3)
ポリメリックMDI(実施例1と同じ)100質量部に対して、離型剤としてポリエチレンワックスエマルジョン(三井化学ポリウレタン株式会社製「コスモネート XRA−600」を3質量部添加して混合することによって、ポリメリックMDIに離型剤を分散させた。そして木材として厚み12mmの表面ラワン合板を用い、木材の表面にこの離型剤を分散したポリメリックMDIを100g/mの塗布量で塗布した。
(Example 3)
By adding 3 parts by mass of polyethylene wax emulsion (“Cosmonate XRA-600” manufactured by Mitsui Chemicals Polyurethane Co., Ltd.) as a release agent to 100 parts by mass of polymeric MDI (same as Example 1) A release agent was dispersed in MDI, and a surface lauan plywood having a thickness of 12 mm was used as the wood, and polymeric MDI in which the release agent was dispersed was applied to the surface of the wood at a coating amount of 100 g / m 2 .

次に、水系接着剤としてスチレンブタジエンゴム及びメラミンからなるエマルジョン接着剤(株式会社サンベーク製の「NM591C」と「C−20」を質量比6:4で混合)を用い、離型剤を分散したポリメリックMDIを塗布した直後(約3秒後)に、この水系接着剤を木材の表面に70g/mの塗布量で塗布した。 Next, an emulsion adhesive composed of styrene butadiene rubber and melamine (mixed with “NM591C” and “C-20” manufactured by Sunbake Co., Ltd. at a mass ratio of 6: 4) as a water-based adhesive was used, and the release agent was dispersed. Immediately after applying the polymeric MDI (after about 3 seconds), this aqueous adhesive was applied to the surface of the wood at a coating amount of 70 g / m 2 .

このように木材の表面に離型剤を分散したポリメリックMDIと水系接着剤を塗布した後、なら材のスライス単板からなる厚み0.3mmの化粧材を木材の表面に重ね、これを熱盤の間にセットし、120℃、0.7MPa、1分間の条件で加熱加圧することによって、化粧材付の建築板を得た。   After applying the polymeric MDI with the release agent dispersed on the surface of the wood and the water-based adhesive in this way, a 0.3 mm thick decorative material consisting of a single slice of material is stacked on the surface of the wood, and this is put on the hot platen. A building board with a decorative material was obtained by heating and pressing under conditions of 120 ° C., 0.7 MPa, and 1 minute.

(比較例4)
実施例3において、離型剤を分散したポリメリックMDIを塗布せず、水系接着剤のみを塗布するようにした。その他は、実施例3と同様にして化粧材付の建築板を得た。
(Comparative Example 4)
In Example 3, the polymeric MDI in which the release agent was dispersed was not applied, but only the aqueous adhesive was applied. Otherwise, a building board with a decorative material was obtained in the same manner as in Example 3.

(参考例1)
離型剤を分散しないポリメリックMDIを用いるようにした。その他は、実施例3と同様にして化粧材付の建築板を得た。
(Reference Example 1)
Polymeric MDI that does not disperse the release agent was used. Otherwise, a building board with a decorative material was obtained in the same manner as in Example 3.

上記のように実施例3、比較例4、参考例1で得た建築板を用い、化粧材の表面の上に25kgの荷重をかけた直径50mmの金属製キャスターを2000往復走行させ、最大凹み量を測定した。また加熱加圧した後の熱盤の離型性を評価した。結果を表2に示す。   Using the building board obtained in Example 3, Comparative Example 4, and Reference Example 1 as described above, a metal caster having a diameter of 50 mm and a load of 25 kg was applied on the surface of the decorative material, and 2,000 reciprocating travels were performed. The amount was measured. Moreover, the release property of the hot platen after heating and pressing was evaluated. The results are shown in Table 2.

Figure 0004830900
Figure 0004830900

表2にみられるように、実施例3のものは、最大凹み量が小さく表面の強度が高いことが確認されるものであり、また離型剤を分散しないポリメリックMDIを用いた参考例1では、熱盤に化粧材が付着して取り出しに時間がかかり、離型性に問題があったが、離型剤を分散したポリメリックMDIを用いた実施例3のものは離型性が良好であった。   As seen in Table 2, it is confirmed that Example 3 has a small maximum dent amount and high surface strength, and in Reference Example 1 using a polymeric MDI that does not disperse a release agent. However, it took a long time to take out the cosmetic material on the hot platen and there was a problem in the releasability, but the product of Example 3 using the polymeric MDI in which the release agent was dispersed had good releasability. It was.

本発明の実施の形態の一例を示すものであり、(a)(b)はそれぞれ概略図である。1 shows an example of an embodiment of the present invention, and (a) and (b) are schematic views.

符号の説明Explanation of symbols

1 木材
2 硬化樹脂層
3 化粧材
1 Wood 2 Hardened resin layer 3 Cosmetic material

Claims (3)

合板又はむく材により構成される木材の表面にポリメリックMDIを塗布し、続いて水系接着剤を塗布し、木材のこの表面に化粧材を重ねた後、木材のこの表面を加熱加圧してポリメリックMDIと水系接着剤を同時に硬化させることを特徴とする建築板の製造方法。 Apply polymeric MDI to the surface of wood made of plywood or peeler , then apply a water-based adhesive, overlay a decorative material on this surface of wood, then heat and press this surface of wood to make polymeric MDI And a water-based adhesive are simultaneously cured. 木材の表面にポリメリックMDIを塗布するにあたって、離型剤を分散させたポリメリックMDIを塗布することを特徴とする請求項1に記載の建築板の製造方法。   2. The method for manufacturing a building board according to claim 1, wherein the polymeric MDI in which a release agent is dispersed is applied when the polymeric MDI is applied to the surface of the wood. 請求項1又は2の方法で製造されたものであることを特徴とする建築板。   A building board produced by the method according to claim 1 or 2.
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