JP2020002222A - Photocurable filler - Google Patents
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Description
本発明は、パーティクルボードの木口処理に適する光硬化性目止め剤に関する。 TECHNICAL FIELD The present invention relates to a photo-curable filler which is suitable for treating a particle board with a wood opening.
一般に造作部材として用いられる木質系基材としては、合板、パーティクルボード、ファイバーボードなどがある。そしてその表面や側面（木口）へ塗装などにより表面仕上げを行う場合には、密着性や硬度などの表面物性向上、平滑性などの意匠性向上を目的に、下地処理を行うことが一般的である。例えば下地隠蔽性を確保するためのシーラー塗布やチタン紙等の隠蔽紙貼り付け、またフラットな表面を確保するための目止め処理などがその一例である。 Wood-based substrates generally used as construction members include plywood, particle board, fiber board and the like. When the surface or side surface (kiguchi) is subjected to surface finishing by painting or the like, it is common to perform a base treatment for the purpose of improving surface physical properties such as adhesion and hardness, and improving design properties such as smoothness. is there. For example, application of a sealer for securing the base concealing property, pasting of concealing paper such as titanium paper, and sealing treatment for securing a flat surface are examples thereof.
目止め処理については、基材表面の凹面の埋め込みによる平滑な塗装下地形成や、塗料の過剰な浸透、吸収を減少させるため必要とされており、例えば不飽和ポリエステル樹脂とエポキシ（メタ）アクリレート及び又はウレタンアクリレート、顔料、光開始剤およびアクリル系モノマーからなる紫外線硬化型目止め塗料組成物が提案されており（特許文献１）、特に基材表面については容易に平滑化が可能で、意匠面の向上を図ることできる。 The filling treatment is required to form a smooth paint base by embedding the concave surface of the base material surface and to reduce excessive penetration and absorption of the paint. For example, unsaturated polyester resin and epoxy (meth) acrylate and Alternatively, an ultraviolet-curable sealing coating composition comprising a urethane acrylate, a pigment, a photoinitiator and an acrylic monomer has been proposed (Patent Document 1), and particularly, the surface of a base material can be easily smoothed, and the surface of a design can be easily designed. Can be improved.
一方側面である木口については、表面と比較して凹凸が大きいため平滑化が難しくなる。特に木材の小片を接着剤と混合し熱圧成形したパーティクルボードについては、低コストである反面、その木口は凹凸と空隙が非常に大きいため、樹脂の吸い込みが不均一で激しく平滑化が非常に難しい。この難しい木口の目止め作業に対し、例えば目止め剤を押し出す加圧器と木口面に沿って移動できる吸盤を有する充填装置が提案されている（特許文献２）。しかしながらパーティクルボードの木口に適した具体的な目止め剤については開示されておらず、また一般的な光硬化性の目止め剤を転用しても基材への浸透が一様でないため、深部硬化性に起因する経時での外観変化の問題があり改善の余地があった。 On the other hand, as for the kiguchi, which is the side surface, the unevenness is larger than the surface, so that smoothing becomes difficult. In particular, particle board made by mixing small pieces of wood with an adhesive and hot pressing is low cost, but its wood mouth has very large irregularities and voids, so the resin suction is uneven and it is extremely smooth. difficult. A filling device having a pressurizer that extrudes a filler and a suction cup that can move along the edge of the opening has been proposed for this difficult opening operation of the opening (Patent Document 2). However, it does not disclose a specific filler suitable for the opening of the particle board, and even if a general photocurable filler is diverted, the penetration into the base material is not uniform, so that the There is a problem of change in appearance over time due to curability, and there is room for improvement.
本発明の課題は、安価で入手性が容易な木質系材料であるパーティクルボードの木口処理で用いる目止め剤であって、木口表面の凹凸や空隙が大きいことにより目止め剤の浸透量が一様でなくとも、充分な深部硬化が可能で、耐熱性や耐溶剤性に優れ、硬化後の外観変化もない小口用目止め剤組成物を提供することにある。 It is an object of the present invention to provide a filler for use in the opening process of particle board, which is an inexpensive and readily available wood-based material, and the penetration amount of the opening agent is reduced due to large irregularities and voids on the opening surface. An object of the present invention is to provide a small-opening sealant composition which can cure sufficiently deep, has excellent heat resistance and solvent resistance, and has no change in appearance after curing.
請求項１の発明は、ビスフェノールＡエポキシジアクリレート（Ａ）と、多官能反応性希釈モノマー（Ｂ）と、光重合開始剤（Ｃ）からなり、前記（Ｃ）の配合量がラジカル重合性成分１００重量部に対し１０〜２０重量部であることを特徴とするパーティクルボード小口用の光硬化性目止め剤組成物を提供する。 The invention of claim 1 comprises a bisphenol A epoxy diacrylate (A), a polyfunctional reactive diluent monomer (B), and a photopolymerization initiator (C), and the compounding amount of the (C) is a radical polymerizable component. Provided is a photocurable sealant composition for a small particle board, which is 10 to 20 parts by weight based on 100 parts by weight.
また請求項２の発明は、組成物の粘度が４０〜１００Ｐａ・ｓであることを特徴とする請求項１記載のパーティクルボードの小口用光硬化性目止め剤組成物を提供する。 The invention according to claim 2 provides the photocurable sealant composition for small-sized particle board according to claim 1, wherein the composition has a viscosity of 40 to 100 Pa · s.
また請求項３の発明は、請求項１または２いずれか記載の光硬化性目止め剤組成物を５〜１０ｇ／１００００ｍｍ２塗布することを特徴とするパーティクルボード木口の目止め方法を提供する。 The invention of claim 3 provides the sealing method of particle board cut end, characterized by applying claim 1 or 2 or a photocurable th preventive composition according 5 to 10 g / 10000 mm 2.
本発明の光硬化性樹脂組成物は、耐熱性や耐溶剤性に優れ硬化後の経時的な外観変化もなく、表面の凹凸や空隙が大きいパーティクルボード木口用の目止め剤として有用である。 INDUSTRIAL APPLICABILITY The photocurable resin composition of the present invention has excellent heat resistance and solvent resistance, has no change in appearance over time after curing, and is useful as a filler for a particle board having a large surface unevenness and voids.
本発明の光硬化型目止め剤組成物の構成は、ビスフェノールＡエポキシジアクリレート（Ａ）と、多官能反応性希釈モノマー（Ｂ）と、光重合開始剤（Ｃ）である。なお、本明細書において、（メタ）アクリレートは、アクリレートとメタクリレートとの双方を包含する。 The composition of the photocurable filler composition of the present invention is bisphenol A epoxy diacrylate (A), a polyfunctional reactive diluent monomer (B), and a photopolymerization initiator (C). In addition, in this specification, (meth) acrylate includes both acrylate and methacrylate.
本発明に使用されるビスフェノールＡエポキシジアクリレート（Ａ）は、（Ｂ）と共に反応して目止め樹脂硬化層を形成する主要成分であり、その剛直な骨格により硬化物の硬度が高く、耐熱性及び耐溶剤に優れ、またハーゼン色数が低い２官能のオリゴマーである。耐溶剤性に優れるため、上塗りで使用する化粧塗料に溶剤が含まれていても表面が侵されることがなく、高い意匠性を確保することができる。また官能基数については、反応性と硬化収縮のバランスの面から３官能以上は不適である。 The bisphenol A epoxy diacrylate (A) used in the present invention is a main component forming a cured resin cured layer by reacting with (B), and the rigidity of the cured product is high due to its rigid skeleton, and the heat resistance is high. And a bifunctional oligomer having excellent solvent resistance and a low Hazen color number. Since it has excellent solvent resistance, even if the cosmetic paint used for the top coat contains a solvent, the surface is not damaged and a high design property can be ensured. Regarding the number of functional groups, three or more functional groups are inappropriate from the viewpoint of the balance between reactivity and curing shrinkage.
前記（Ａ）の全固形分に対する配合量は、６０〜８５重量％が好ましく、７０〜８２重量％が更に好ましい。６０重量％以上とすることで目止め剤として充分な物性を確保することができ、８５重量％以下とすることで目止め作業に適した粘度に調整しやすくできる。 The blending amount of (A) with respect to the total solid content is preferably from 60 to 85% by weight, more preferably from 70 to 82% by weight. When the content is 60% by weight or more, sufficient physical properties as a filler can be secured, and when the content is 85% by weight or less, the viscosity can be easily adjusted to be suitable for the filling operation.
本発明に使用される多官能反応性希釈モノマー（Ｂ）は、組成物の粘度を下げると共に硬化性を向上させる目的で配合する。例えば２官能モノマーとしては、（ポリ）エチレングリコールジ（メタ）アクリレート、ジエチレングリコールジ（メタ）アクリレート、トリエチレングルコールジ（メタ）アクリレート、（ポリ）プロピレングリコールジ（メタ）アクリレート、ジプロピレングリコールジ（メタ）アクリレート、トリプロピレングリコールジ（メタ）アクリレート、１．４−ブタンジオールジ（メタ）アクリレート、４．６−ヘキサンジオールジ（メタ）アクリレート、１．９−ノナンジオールジ（メタ）アクリレート、１．１０−デカンジオールジ（メタ）アクリレート、ペンタエリスリトールジ（メタ）アクリレートなどがある。 The polyfunctional reactive diluent monomer (B) used in the present invention is blended for the purpose of lowering the viscosity of the composition and improving curability. For example, bifunctional monomers include (poly) ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, and dipropylene glycol di (meth) acrylate. (Meth) acrylate, tripropylene glycol di (meth) acrylate, 1.4-butanediol di (meth) acrylate, 4.6-hexanediol di (meth) acrylate, 1.9-nonanediol di (meth) acrylate, 1.10-decanediol di (meth) acrylate, pentaerythritol di (meth) acrylate and the like.
３官能モノマーとして、例えばトリメチロールプロパントリ（メタ）アクリレート、エチレンオキサイド（以下ＥＯ）変性トリメチロールプロパントリ（メタ）アクリレート、プロピレンオキサイド変性トリメチロールプロパントリ（メタ）アクリレート、トリス（２−アクリロキシエチル）イソシアヌレート、ペンタエリスリトールトリ（メタ）アクリレート、ＥＯ変性ペンタエリスリトールトリ（メタ）アクリレート、プロピレンオキサイド変性ペンタエリスリトールトリ（メタ）アクリレート、ジペンタエリスリトールトリ（メタ）アクリレート、アルキル変性ジペンタエリスリトールトリ（メタ）アクリレートがある。更に４官能以上のモノマーとしては、例えばトリメチロールプロパンテトラ（メタ）アクリレート、ペンタエリスルトールテトラ（メタ）アクリレート、ジペンタエリスリトールテトラ（メタ）アクリレート、アルキル変性ジペンタエリスリトールテトラ（メタ）アクリレート、ジペンタエリスリトールペンタ（メタ）アクリレート、アルキル変性ジペンタエリスリトールペンタ（メタ）アクリレート、ジペンタエリスリトールヘキサ（メタ）アクリレート、カプロラクトン変性ジペンタエリスリトールヘキサ（メタ）アクリレート等があり、単独あるいは２種類以上を組み合わせて使用できる。これらの中では反応性と硬化収縮のバランスの点で３官能モノマーが好ましく、特に粘度が低いため希釈効果が高く、硬化物のガラス転移点が-８℃で可撓性の高い分子構造をもつＥＯ変性（６）トリメチロールプロパントリアクリレートが好適である。 As the trifunctional monomer, for example, trimethylolpropane tri (meth) acrylate, ethylene oxide (hereinafter referred to as EO) -modified trimethylolpropane tri (meth) acrylate, propylene oxide-modified trimethylolpropane tri (meth) acrylate, tris (2-acryloxyethyl) ) Isocyanurate, pentaerythritol tri (meth) acrylate, EO-modified pentaerythritol tri (meth) acrylate, propylene oxide-modified pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, alkyl-modified dipentaerythritol tri (meth) acrylate A) Acrylate. Further, as a monomer having four or more functional groups, for example, trimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate, alkyl-modified dipentaerythritol tetra (meth) acrylate, There are pentaerythritol penta (meth) acrylate, alkyl-modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate, and the like, alone or in combination of two or more. Can be used. Of these, trifunctional monomers are preferred in terms of the balance between reactivity and curing shrinkage. Particularly, since the viscosity is low, the diluting effect is high, and the cured product has a glass transition point of -8 ° C and a highly flexible molecular structure. EO-modified (6) trimethylolpropane triacrylate is preferred.
前記（Ｂ）の全固形分に対する配合量は、３〜２０重量％が好ましく、６〜１５重量％が更に好ましい。３重量％以上とすることで充分な硬化反応性を確保することができ、２０重量％以下とすることで目止め作業に適した粘度に調整しやすくできる。 The blending amount of (B) with respect to the total solid content is preferably 3 to 20% by weight, and more preferably 6 to 15% by weight. When the content is 3% by weight or more, sufficient curing reactivity can be ensured, and when the content is 20% by weight or less, the viscosity can be easily adjusted to be suitable for the filling operation.
本発明で使用される光重合開始剤（Ｃ）は、紫外線や電子線などの照射でラジカルを生じ、そのラジカルが重合反応のきっかけとなるもので、ベンジルケタール系、アセトフェノン系、フォスフィンオキサイド系等汎用の光重合開始剤が使用できる。重合開始剤の光吸収波長を任意に選択することによって、紫外線領域から可視光領域にいたる広い波長範囲にわたって硬化性を付与することができる。具体的にはベンジルケタール系として２．２-ジメトキシ-１．２-ジフェニルエタン-1-オンが、α−ヒドロキシアセトフェノン系として２-ヒドロキシ−２−メチル-１-フェニル−プロパン−１−オン及び１−ヒドロキシ−シクロヘキシル−フェニル−ケトン及び１−［４−（２−ヒドロキシエトキシ）−フェニル］−２−ヒドロキシ−２−メチル−１−プロパン−１−オンが、α-アミノアセトフェノン系として２-メチル-１-(４-メチルチオフェニル)-２-モルフォリノプロパン-１-オンが、アシルフォスフィンオキサイド系として２．４．６-トリメチルベンゾイル-ジフェニル-フォスフィンオキサイド及びビス（２．４．６‐トリメチルベンゾイル）‐フェニルフォスフィンオキサイド等があり、単独または２種以上を組み合わせて使用できる。これらの中では、黄変しにくいα−ヒドロキシアセトフェノン系を含むことが好ましい。 The photopolymerization initiator (C) used in the present invention generates radicals upon irradiation with ultraviolet rays or electron beams, and the radicals trigger the polymerization reaction. Benzyl ketals, acetophenones, and phosphine oxides are used. General-purpose photopolymerization initiators can be used. By arbitrarily selecting the light absorption wavelength of the polymerization initiator, curability can be imparted over a wide wavelength range from the ultraviolet region to the visible light region. Specifically, 2.2-dimethoxy-1.2-diphenylethan-1-one is used as a benzyl ketal type, and 2-hydroxy-2-methyl-1-phenyl-propan-1-one and α-hydroxyacetophenone are used as an α-hydroxyacetophenone type. 1-Hydroxy-cyclohexyl-phenyl-ketone and 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one are 2-alpha as α-aminoacetophenones. Methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one was used as an acylphosphine oxide system for 2.4.6-trimethylbenzoyl-diphenyl-phosphine oxide and bis (2.4.6). -Trimethylbenzoyl) -phenylphosphine oxide and the like, and can be used alone or in combination of two or more. Among these, it is preferable to include an α-hydroxyacetophenone-based compound that does not easily yellow.
前記（Ｃ）の配合量はラジカル重合性成分１００重量部に対して、１０〜２０重量部配合であり、１２〜１８重量部が好ましく、１３〜１５重量部が更に好ましい。この範囲で配合する事により、塗布量が不均一な木口面でも経時的な外観変化が無く、効率的に硬化させる事ができる。市販品としてはＩｒｇａｃｕｒｅ１８４及び同１１７３（商品名：ＢＡＳＦジャパン社製）などがある。 The amount of (C) is 10 to 20 parts by weight, preferably 12 to 18 parts by weight, more preferably 13 to 15 parts by weight, based on 100 parts by weight of the radical polymerizable component. By blending in this range, there is no change in appearance over time even on a wooden surface having an uneven application amount, and curing can be efficiently performed. Commercial products include Irgacure 184 and Irgacure 1173 (trade name: manufactured by BASF Japan).
上記に加えて、本発明の樹脂組成物は性能を損なわない範囲で、必要に応じレベリング剤、酸化防止剤、消泡剤、充填剤、有機微粒子、シランカップリング剤、着色剤などの各種添加剤を併用することができる。 In addition to the above, the resin composition of the present invention may contain various additives such as a leveling agent, an antioxidant, an antifoaming agent, a filler, organic fine particles, a silane coupling agent, and a coloring agent, as long as the performance is not impaired. Agents can be used in combination.
本発明の光硬化性目止め剤組成物の塗布方法は特に制限は無く、刷毛やローラー、樹脂コーティングに用いるガン方式のコーティングヘッドなどにより塗布することができるが、木口という木質材料の側面に塗布するため、手により均一に塗布することが難しくまた塗布量が多すぎるとたれ易くなるため、コーティングヘッドを用いて自動機により塗布することが好ましい。塗布量は５〜１０ｇ／１００００ｍｍ２が好ましく、６〜８．５ｇ／１００００ｍｍ２が更に好ましい。５ｇ以下では木口への樹脂吸い込みにより表面がフラットに仕上がりにくい傾向があり、１０ｇ以上では樹脂が垂れて同じく表面がフラットに仕上がりにくい傾向がある。 The method of applying the photocurable filler composition of the present invention is not particularly limited, and can be applied with a brush, a roller, a gun-type coating head used for resin coating, or the like, but applied to the side of a wood material called Kiguchi. Therefore, it is difficult to apply uniformly by hand, and if the amount of application is too large, it is easy to sag. Therefore, it is preferable to apply by an automatic machine using a coating head. The coating amount is preferably from 5~10g / 10000mm 2, 6~8.5g / 10000mm 2 is more preferable. If the amount is 5 g or less, the surface tends to be hardly finished due to the suction of the resin into the mouth, and if the amount is 10 g or more, the resin tends to drip and the surface tends to be hardly finished.
本発明の光硬化性目止め剤組成物を木口に塗布後は、紫外線照射機を用いて硬化させる。紫外線を照射する場合の光源としては例えば、低圧水銀ランプ、高圧水銀ランプ、趙高圧水銀ランプ、カーボンアーク灯、キセノンランプ、メタルハライドランプ、無電極紫外線ランプなどが挙げられ、これらの中では立ち上がり時間が短い無電極紫外線ランプが好ましい。ランプ出力としては１．０〜５．０Ｋｗが例示され、照射強度等は光源と基材との距離、照射面積、照射時間等により適宜選択される。 After the photocurable filler composition of the present invention has been applied to the wood end, it is cured using an ultraviolet irradiator. Examples of the light source for irradiating ultraviolet light include a low-pressure mercury lamp, a high-pressure mercury lamp, a Zhao high-pressure mercury lamp, a carbon arc lamp, a xenon lamp, a metal halide lamp, and an electrodeless ultraviolet lamp. Short electrodeless UV lamps are preferred. The lamp output is exemplified by 1.0 to 5.0 Kw, and the irradiation intensity and the like are appropriately selected depending on the distance between the light source and the substrate, the irradiation area, the irradiation time, and the like.
パーティクルボード木口は表面の凹凸が激しくまた空隙も大きいため、目止め剤の吸い込みが激しい。そのため目止め剤の塗布後は、時間をおかずに紫外線を照射し硬化させることが好ましい。照射までの時間が長いと、目止め剤の不均一な吸い込みにより表面に凹凸ができやすくなる。また目止め剤に溶剤が含まれると基材中に溶剤が取り込まれ、紫外線照射により表面が硬化されると、溶剤が基材中に滞留することになり、その後の様々な不具合の要因となるため、目止め剤は無溶剤であることが好ましい。 Particle board Kiguchi has severe surface irregularities and large voids, so the filler is sucked in hardly. For this reason, it is preferable to irradiate ultraviolet rays and harden after a short time after the application of the filler. If the time until irradiation is long, unevenness is likely to be formed on the surface due to uneven suction of the filler. In addition, when the solvent is contained in the filler, the solvent is taken into the base material, and when the surface is cured by irradiation with ultraviolet rays, the solvent stays in the base material, which causes various troubles thereafter. Therefore, the filler is preferably solvent-free.
本発明の光硬化性目止め剤組成物を硬化後は、表面の凹凸を平坦化するため、サンディング加工をすることが好ましい。サンディング加工は、荒い番手から細かい番手へ順に複数回の加工工程で行うことが好ましく、これにより表面状態がよりフラットとなり、その上に化粧塗装を行ったときの外観を著しく向上させることができる。 After curing the photocurable filler composition of the present invention, it is preferable to perform a sanding process in order to flatten surface irregularities. The sanding is preferably performed in a plurality of processing steps in order from a rough count to a fine count, whereby the surface state becomes flatter, and the appearance when decorative coating is performed thereon can be significantly improved.
本発明の光硬化性目止め剤組成物の粘度は４０〜１００Ｐａ・ｓであることが好ましく、４５〜８０Ｐａ・ｓであることが更に好ましく、５０〜６０Ｐａ・ｓであることが特に好ましい。４０Ｐａ・ｓ以上とすることで高温時の垂れを防止すると共に基材への過剰な吸い込みを防止でき、１００Ｐａ・ｓ以下とすることで適切な塗布量にコンロトールしやすくできる。 The viscosity of the photocurable filler composition of the present invention is preferably from 40 to 100 Pa · s, more preferably from 45 to 80 Pa · s, and particularly preferably from 50 to 60 Pa · s. By setting the pressure to 40 Pa · s or more, dripping at a high temperature can be prevented, and excessive suction into the substrate can be prevented. By setting the pressure to 100 Pa · s or less, control can be easily performed to an appropriate application amount.
以下、本発明について実施例及び比較例を挙げてより詳細に説明するが、具体例を示すものであって、特にこれらに限定するものではない。なお表記が無い場合は、室温は２５℃相対湿度６５％の条件下で測定を行った。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but it shows specific examples, and the present invention is not particularly limited thereto. In addition, when there was no description, the measurement was performed under the condition of room temperature of 25 ° C. and relative humidity of 65%.
白色目止め樹脂の作成
前記（Ａ）としてＭＩＲＡＭＥＲ ＰＥ２１０（商品名：ＭＩＷＯＮ社製）を、前記（Ｂ）としてＭＩＲＡＭＥＲ Ｍ３１６０（商品名：同社製、ＥＯ変性（６）トリメチロールプロパントリアクリレート）を、前記（Ｃ）としてＩｒｇａｃｕｒｅ１１７３（商品名：ＢＡＳＦジャパン社製、α−ヒドロキシアセトフェノン系）及びＩｒｇａｃｕｒｅ１８４（商品名：同社製、α−ヒドロキシアセトフェノン系）及びＩｒｇａｃｕｒｅＴＰＯ（商品名：同社製、アシルフォスフィンオキサイド系）を用い、表１記載の配合にて遮光ビンに入れ均一になるまで撹拌脱泡し、実施例および比較例の目止め樹脂組成物を調整した。なお配合表の単位は重量部とする。
Preparation of White Filling Resin MIRAMER PE210 (trade name: manufactured by MIWON) as (A) and MIRAMER M3160 (trade name: EO-modified (6) trimethylolpropane triacrylate) as (B), As the above (C), Irgacure 1173 (trade name: manufactured by BASF Japan, α-hydroxyacetophenone type) and Irgacure 184 (trade name: manufactured by the company, α-hydroxyacetophenone type) and Irgacure TPO (trade name: manufactured by the company, acylphosphine oxide type) ) Was placed in a light-shielding bottle with the composition shown in Table 1, and the mixture was stirred and defoamed until the mixture became uniform, thereby preparing the filling resin compositions of Examples and Comparative Examples. The unit of the composition table is parts by weight.
表１
Table 1
評価方法は以下の通りとした。 The evaluation method was as follows.
評価用試験片の作成
３００ｍｍ×４５ｍｍ×厚さ２５ｍｍのパーティクルボードの側面(木口面)に、ヘラを用いて光硬化性目止め剤を平滑に塗装する。その後、アイグラフィックス社製の露光装置アイグランテージＥＣＳ−１５１Ｕを用い、高圧水銀灯光源で出力４０ｍＷ／ｃｍ２、積算光量４５ｍＪ／ｃｍ２で紫外線照射して硬化させたものを試験片とした。
Preparation of Test Piece for Evaluation A photocurable filler is applied smoothly to the side surface (cut surface) of a particle board of 300 mm × 45 mm × 25 mm in thickness using a spatula. Thereafter, a test piece was obtained by irradiating an ultraviolet ray at a power of 40 mW / cm 2 and an integrated light quantity of 45 mJ / cm 2 with a high-pressure mercury lamp light source using an exposure apparatus Eye Grantage ECS-151U manufactured by Eye Graphics Co., Ltd. to obtain a test piece.
粘度：東機産業製のＢＭ型粘度計ＴＶＢ−１０を用い、Ｎｏ.４ローターで２５±１℃、回転数６ｒｐｍで測定した。 Viscosity: Measured using a BM type viscometer TVB-10 manufactured by Toki Sangyo with a No. 4 rotor at 25 ± 1 ° C. and a rotation speed of 6 rpm.
冷熱サイクルテスト：上記試験片を、８０℃の恒温槽に２時間放置した後、直ぐに−２０℃の恒温槽に２時間放置する。これを計４サイクル実施した後、室温まで放置し、試験片に剥離や浮き、割れを目視にて確認し、何も問題が無いものを○、いずれか問題があるものを×とした。 Cooling / heating cycle test: The test piece was left in a constant temperature bath at 80 ° C. for 2 hours, and then immediately left in a constant temperature bath at −20 ° C. for 2 hours. After a total of 4 cycles, this was allowed to stand at room temperature, and peeling, floating, and cracking of the test piece were visually observed. A sample having no problem was evaluated as ○, and a sample having any problem was evaluated as ×.
耐熱性：上記試験片を６０℃、８０℃、１００℃の恒温槽に各々１時間放置し、その後室温まで放置後に、剥離や浮き、割れを目視にて確認し、何も問題が無いものを○、いずれか問題があるものを×とした。 Heat resistance: The above test pieces were left in a constant temperature bath at 60 ° C., 80 ° C., and 100 ° C. for 1 hour, respectively, and then left at room temperature. Then, peeling, floating, and cracks were visually observed. 、, any of which had a problem was rated as ×.
経時外観変化：硬化して１週間経過後、塗膜上に著しい外観変化があるか目視にて確認し、変化無しを○、変化ありを×とした。 Appearance change over time: One week after curing, it was visually confirmed whether or not there was a remarkable change in appearance on the coating film.
塗装性：実施例及び比較例１、５について、コーティングヘッドを用いた自動機によりパーティクルボードの木口へ実際に塗布して液ダレ性を目視にて確認し、液ダレがなく均一を◎、液ダレがなしを○、ありを×とした。 Paintability: For Examples and Comparative Examples 1 and 5, the coating was actually applied to the tip of the particle board by an automatic machine using a coating head, and the liquid dripping property was visually checked. No dripping was indicated by "O", and dripping was indicated by "X".
評価結果
表２
Evaluation results Table 2
実施例１及び２の光硬化型目止め樹脂組成物は、各評価結果いずれも良好であった。 Each of the evaluation results of the photocurable sealing resin compositions of Examples 1 and 2 was good.
一方、（Ｃ）の配合量が少ない比較例１〜４は経時的な外観変化があり、また（Ｃ）の配合量が多い比較例５は塗装性が×となり、いずれも本願発明に適さないものであった。 On the other hand, Comparative Examples 1 to 4 in which the blending amount of (C) is small have a change in appearance over time, and Comparative Example 5 in which the blending amount of (C) is large has poor paintability, and none of them are suitable for the present invention. Was something.
本発明の光硬化型目止め樹脂組成物は、硬化性及び耐熱性に優れ経時的な外観変化も無く、パーティクルボード木口の目止め剤として有用である。
The photocurable sealing resin composition of the present invention is excellent in curability and heat resistance, does not change in appearance over time, and is useful as a filler for particleboard wood.
Claims (3)
The filling method of particle board butt end, characterized in that the claim 1 or 2 photocurable th preventive composition according to any one to 5 to 10 g / 10000 mm 2 coating.
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