JP2015089971A - Low-pressure melamine decorative plate production method - Google Patents
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本発明は、家具や床材等に使用されるメラミン化粧板に関するものである。より詳しくは、低圧メラミン化粧板に関するものである。 The present invention relates to a melamine decorative board used for furniture, flooring and the like. More specifically, the present invention relates to a low-pressure melamine decorative board.
メラミン化粧板は熱圧成型時の成型圧力が異なることから、高圧メラミン化粧板と低圧メラミン化粧板に大別される。
高圧メラミン化粧板は、基本的には、メラミン樹脂を主成分とするメラミン樹脂含浸液を化粧板原紙に含浸し、乾燥したメラミン樹脂含浸化粧板原紙と、フェノール樹脂を主成分とするフェノール樹脂含浸液をクラフト紙等のコア紙に含浸し、乾燥したフェノール樹脂含浸コア紙複数枚とを積層し、成型圧力４０〜１２０ｋｇ／ｃｍ２で熱圧成型して積層体とし、さらにこの積層体をパーティクルボードやＭＤＦ（中密度繊維質板）等の基材表面に接着剤で接着することにより製造される。熱圧成型はコールドプレス、ホットプレス、コールドプレスというサイクルで長時間連続成型される。
The melamine decorative board is roughly classified into a high-pressure melamine decorative board and a low-pressure melamine decorative board because the molding pressure at the time of hot-pressure molding is different.
The high-pressure melamine decorative board is basically impregnated with a melamine resin impregnating liquid mainly composed of melamine resin in a decorative board base paper, dried melamine resin-impregnated decorative board base paper, and phenol resin impregnated mainly with a phenol resin. A core paper such as kraft paper is impregnated with liquid, and a plurality of dried phenol resin-impregnated core papers are laminated and hot-press molded at a molding pressure of 40 to 120 kg / cm 2 to form a laminated body. It is manufactured by adhering to a substrate surface such as a board or MDF (medium density fiber board) with an adhesive. Hot pressing is continuously performed for a long time in a cycle of cold press, hot press, and cold press.
一方、低圧メラミン化粧板は、基本的には、メラミン樹脂含浸化粧板原紙を基材に積層し、成型圧力１０〜４０ｋｇ／ｃｍ２で熱圧成型し、成型と同時に含浸樹脂により接着して製造される。熱圧成型はコールドプレスのないホットプレスのみのショートサイクルである。メラミン樹脂はショートサイクルに適した硬化の早いものが用いられる。
低圧メラミン化粧板は高圧メラミン化粧板に比べて、生産性は良いものの品質的には劣り、例えば光沢の点では劣るという問題点がある。
On the other hand, a low-pressure melamine decorative board is basically manufactured by laminating a melamine resin-impregnated decorative board base paper on a base material, hot pressing at a molding pressure of 10 to 40 kg / cm 2 , and bonding with the impregnating resin simultaneously with the molding. Is done. Hot pressing is a short cycle of only hot press without cold press. As the melamine resin, a fast curing suitable for a short cycle is used.
The low-pressure melamine decorative board has a problem that the productivity is inferior to that of the high-pressure melamine decorative board, but the quality is inferior, for example, in terms of gloss.
メラミン樹脂含浸液の観点から、低圧メラミン化粧板の光沢を改善する方法としては、特許文献１に、メラミン樹脂含浸液に特定組成のジアリルフタレート系エマルジョンを配合することが提案されている。 From the viewpoint of a melamine resin impregnating liquid, as a method for improving the gloss of a low-pressure melamine decorative board, Patent Document 1 proposes that a diallyl phthalate emulsion having a specific composition is blended in a melamine resin impregnating liquid.
化粧板原紙の観点から、低圧メラミン化粧板の光沢を改善する方法としては、本出願人は特許文献２で、紙の熱水ｐＨが６．５〜７．８に調整されたベースの化粧板原紙に、クエン酸とリン酸水素２ナトリウムのｐＨが２．５〜４．５の混合水溶液を外添し、外添乾燥後の紙の熱水ｐＨが６．０〜７．５の範囲になるよう混合水溶液の外添乾燥付着量を０．３〜１．０ｇ／ｍ２に調整された化粧板原紙を用いることを提案している。 As a method for improving the gloss of the low-pressure melamine decorative board from the viewpoint of the decorative board base paper, the present applicant has disclosed a patent document 2 in which the hot water pH of the paper is adjusted to 6.5 to 7.8. To the base paper, a mixed aqueous solution of citric acid and disodium hydrogen phosphate having a pH of 2.5 to 4.5 is externally added, and the hot water pH of the paper after the external addition is dried is in the range of 6.0 to 7.5. It is proposed to use a decorative board base paper in which the amount of dry addition of the mixed aqueous solution is adjusted to 0.3 to 1.0 g / m 2 .
薄紙等を用いた化粧シートにおいては、印刷層の上にワニスをトップコートすることで印刷層を保護すると共に艶（光沢）を出した化粧シートも用いられている。化粧シートは接着剤で基材に糊貼りされて化粧板に加工されるものである。例えば、特許文献３の実施例ではワニスとしてスチレン−アクリル系樹脂水溶液をトップコートしている。より詳しくはジョンソンポリマー社製の商品名ジョンクリル４５０（ガラス転移点Ｔｇ＝１６℃）を用いている。 In a decorative sheet using thin paper or the like, a decorative sheet that protects the printed layer by top-coating varnish on the printed layer and has a gloss (gloss) is also used. A decorative sheet is processed into a decorative board by being glued to a base material with an adhesive. For example, in the example of Patent Document 3, a styrene-acrylic resin aqueous solution is top-coated as a varnish. More specifically, the product name John Kuryl 450 (glass transition point Tg = 16 ° C.) manufactured by Johnson Polymer Co., Ltd. is used.
本発明はメラミン樹脂含浸液の観点から、低圧メラミン化粧板の光沢を改善する方法を提供するものである。 This invention provides the method of improving the glossiness of a low-pressure melamine decorative board from a viewpoint of a melamine resin impregnation liquid.
本発明の課題は、メラミン樹脂含浸液に水系のワニスを配合することにより達成される。
即ち、本発明は
［１項］低圧メラミン化粧板の製造方法において、化粧板原紙に固形分でメラミン樹脂１００質量部に対して２〜６質量部の水系のワニスを配合したメラミン樹脂含浸液を含浸することを特徴とする低圧メラミン化粧板の製造方法。
［２項］水系のワニスがスチレン−アクリル系樹脂水溶液、スチレン−アクリル系樹脂エマルジョン又は塩ビ系樹脂エマルジョンであることを特徴とする１項記載の低圧メラミン化粧板の製造方法。
［３項］水系のワニスがガラス転移点（Ｔｇ）が７０〜１１０℃であるスチレン−アクリル系樹脂水溶液であることを特徴とする１項記載の低圧メラミン化粧板の製造方法。
［４項］化粧板原紙が、紙の熱水ｐＨが６．５〜７．８に調整されたベースの化粧板原紙に、クエン酸とリン酸水素２ナトリウムのｐＨが２．５〜４．５の混合水溶液を外添し、外添乾燥後の紙の熱水ｐＨが６．０〜７．５の範囲になるよう混合水溶液の外添乾燥付着量を０．３〜１．０ｇ／ｍ２に調整してなる化粧板原紙であることを特徴とする１〜３項のいずれかに記載の低圧メラミン化粧板の製造方法。
The subject of this invention is achieved by mix | blending an aqueous varnish with a melamine resin impregnation liquid.
That is, the present invention provides [1] a method for producing a low-pressure melamine decorative board, in which a melamine resin impregnating liquid in which 2 to 6 parts by mass of an aqueous varnish is blended with 100 parts by mass of melamine resin in a solid content on a decorative board base paper. A method for producing a low-pressure melamine decorative board, comprising impregnation.
[2] The method for producing a low-pressure melamine decorative board according to [1], wherein the aqueous varnish is a styrene-acrylic resin aqueous solution, a styrene-acrylic resin emulsion, or a vinyl chloride resin emulsion.
[3] The method for producing a low-pressure melamine decorative board according to 1, wherein the aqueous varnish is a styrene-acrylic resin aqueous solution having a glass transition point (Tg) of 70 to 110 ° C.
[Section 4] The decorative board base paper is a base decorative board base paper whose hot water pH is adjusted to 6.5 to 7.8, and the pH of citric acid and disodium hydrogen phosphate is 2.5 to 4. 5 is externally added, and the amount of externally added dry adhesion of the mixed aqueous solution is 0.3 to 1.0 g / m so that the hot water pH of the paper after the external addition is dried is in the range of 6.0 to 7.5. 4. The method for producing a low-pressure melamine decorative board according to any one of items 1 to 3, wherein the decorative board base paper is adjusted to 2 .
本発明により、低圧メラミン化粧板の表面強度特性を有すると共に、光沢の高い低圧メラミン化粧板が提供される。また、本発明は低圧メラミン化粧板の製造工程を増やさずに光沢の高い低圧メラミン化粧板を製造する製造方法を提供するものである。低圧メラミン化粧板に樹脂をトップコートして光沢を出そうとすると製造工程が増え、工程が増える分、コストアップとなる。 According to the present invention, a low-pressure melamine decorative board having the surface strength characteristics of a low-pressure melamine decorative board and having high gloss is provided. The present invention also provides a production method for producing a low-pressure melamine decorative board with high gloss without increasing the production process of the low-pressure melamine decorative board. If a low-pressure melamine decorative board is top-coated with a resin to make it glossy, the number of manufacturing processes increases and the number of processes increases.
以下、順を追って本発明を説明していく。先ず、本発明に用いる化粧板原紙について説明する。化粧板原紙はメラミン化粧板の表面化粧材として用いられている。
化粧板原紙は、公知の通り、ＬＢＫＰ、ＮＢＫＰ等のパルプ、色相に応じて酸化チタン等の填料、顔料、染料等と、湿潤紙力増強剤、硫酸バンド、アルミン酸ナトリウム、歩留向上剤等の製紙用の各種添加剤を含有する紙料を長網抄紙機等の抄紙機で抄造することによって得られる。尚、化粧板原紙はメラミン樹脂を高含浸するため、サイズ剤による内添や外添によるサイズ処理はしない特殊紙である。
Hereinafter, the present invention will be described step by step. First, the decorative board base paper used in the present invention will be described. The decorative board base paper is used as a surface decorative material for a melamine decorative board.
As is well known, decorative base paper is made of pulp such as LBKP and NBKP, fillers such as titanium oxide, pigments and dyes according to the hue, wet paper strength enhancer, sulfate band, sodium aluminate, yield improver, etc. It is obtained by making a paper stock containing various additives for paper making with a paper machine such as a long paper machine. Note that the decorative board base paper is a special paper that is not impregnated with a sizing agent and is not subjected to a size treatment by external addition because it is highly impregnated with melamine resin.
化粧板原紙には公知の通り隠蔽性が付与されている（この点でオーバーレイ原紙とは識別される。オーバーレイ原紙には透明性が要求される）。隠蔽性とは下地の色相や色相ばらつきを覆い隠す特性をいう。一般的には酸化チタンを抄き込んで隠蔽性を付与しているが、色原紙においては、その色相によっても隠蔽性をもたせることができる。例えば、黒色原紙においては、酸化チタンは抄き込まれておらず、黒色顔料あるいは黒色染料を抄き込むことで隠蔽性を持たせている。 The decorative board base paper is concealed as is well known (in this respect, it is distinguished from the overlay base paper. The overlay base paper is required to be transparent). The concealment property refers to a property of covering the hue and hue variation of the base. In general, titanium oxide is incorporated to provide concealability, but the color base paper can also be concealed by its hue. For example, in a black base paper, titanium oxide is not imprinted, and a black pigment or black dye is imprinted to provide concealability.
化粧板原紙の坪量は７０ｇ／ｍ２以上１３０ｇ／ｍ２以下の範囲が一般的であり、メラミン樹脂の含浸性を考慮し、王研式透気度が５〜３０秒に調整されている。 The basis weight of the decorative board base paper is generally in the range of 70 g / m 2 or more and 130 g / m 2 or less, and considering the impregnation property of the melamine resin, the Oken type air permeability is adjusted to 5 to 30 seconds. .
本発明では一般的な化粧板原紙を用いても光沢度の改善された低圧メラミン化粧板を得ることができるが、本出願人が先に提案している特許文献２の方法により弱酸塩水溶液で処理した化粧板原紙を用いた方が、光沢度を底上げできるため好ましい。尚、本発明においては隠蔽性を有する化粧板原紙であれば特に限定するものではなく、黒色原紙のように酸化チタンを含有しない化粧板原紙にも特許文献２の方法が適用される。 In the present invention, it is possible to obtain a low-pressure melamine decorative board with improved glossiness even when using a general decorative board base paper. However, a weak acid salt aqueous solution can be obtained by the method of Patent Document 2 previously proposed by the present applicant. It is preferable to use the treated decorative base paper because the glossiness can be increased. In the present invention, there is no particular limitation as long as the decorative board base paper has a concealing property, and the method of Patent Document 2 is also applied to a decorative board base paper that does not contain titanium oxide, such as black base paper.
弱酸塩水溶液で処理した化粧板原紙は、紙の熱水ｐＨが６．５〜７．８に調整されたベースの化粧板原紙に、クエン酸とリン酸水素２ナトリウムのｐＨが２．５〜４．５の混合水溶液を外添し、外添乾燥後の紙の熱水ｐＨが６．０〜７．５の範囲になるよう混合水溶液の外添乾燥付着量を０．３〜１．０ｇ／ｍ２に調整することで得られる。外添する方法としては、公知の方法を適用すれば良く、抄紙機のウエットプレス工程でのスプレー塗布、サイズプレス含浸、オフラインでのディッピング含浸等が挙げられる。
一般的に化粧板原紙の熱水ｐＨ（ＪＩＳ Ｐ ８１３３）は中性域の品質が求められる。中性とは一般的にはｐＨ＝６．０〜８．０を指している。熱水ｐＨの品質を維持し、光沢を改善するためにはクエン酸とリン酸水素２ナトリウムの混合水溶液のｐＨは２．５〜４．５が好ましい。
The decorative board base paper treated with the weak acid salt aqueous solution is a base decorative board base paper whose hot water pH is adjusted to 6.5 to 7.8, and the pH of citric acid and disodium hydrogen phosphate is 2.5 to Externally add the 4.5 aqueous solution mixture, and add 0.3 to 1.0 g of the external aqueous solution adhering amount of the aqueous solution so that the hot water pH of the paper after the external drying is in the range of 6.0 to 7.5. / M 2 to obtain. As a method of external addition, a known method may be applied, and examples thereof include spray coating in a wet press process of a paper machine, size press impregnation, and off-line dipping impregnation.
Generally, the hot water pH (JIS P 8133) of the decorative board base paper is required to have a neutral quality. Neutral generally refers to pH = 6.0-8.0. In order to maintain the quality of hot water pH and improve gloss, the pH of the mixed aqueous solution of citric acid and disodium hydrogen phosphate is preferably 2.5 to 4.5.
以上説明してきた化粧板原紙は単色のままで或いは印刷を施して表面化粧材として用いられる。印刷はグラビヤ印刷が主流であるがインクジェット印刷も行われている。 The decorative board base paper that has been described above is used as a surface decorative material in a single color or after printing. Gravure printing is the mainstream for printing, but inkjet printing is also performed.
次に、化粧板原紙に含浸するメラミン樹脂含浸液について説明する。メラミン樹脂含浸液はメラミン樹脂を主成分とした水溶液であり、浸透剤、硬化剤、離型剤等の助剤が適宜配合されている。
メラミン樹脂としては公知の通りショートサイクルに適した硬化の速いものが好ましく、例えばヘキスト社製の低圧メラミン化粧板用のメラミン樹脂である商品名マドリットＭＷ５５９が挙げられる。硬化剤としては例えばヘキスト社製の商品名マドリッドハードナーＭＨ８３５、浸透剤としては例えばヘキスト社製の商品名ハイバザールＶＸＴ３７３９が挙げられる。
Next, the melamine resin impregnating liquid impregnated on the decorative board base paper will be described. The melamine resin impregnating liquid is an aqueous solution containing melamine resin as a main component, and auxiliary agents such as a penetrating agent, a curing agent, and a release agent are appropriately blended.
As the melamine resin, as is well known, a resin having a fast curing suitable for a short cycle is preferable. For example, trade name Madrid MW559, which is a melamine resin for a low-pressure melamine decorative board manufactured by Hoechst, is mentioned. Examples of the curing agent include the trade name Madrid Hardener MH835 manufactured by Hoechst, and examples of the penetrating agent include the trade name High Bazaar VXT3739 manufactured by Hoechst.
本発明では、固形分でメラミン樹脂１００質量部に対して２〜６質量部の水系のワニスを配合したメラミン樹脂含浸液を含浸することを特徴としている。メラミン樹脂含浸液の含浸量としては一般的には原紙基準で固形分で１１０〜１５０質量％である。 In this invention, it is characterized by impregnating the melamine resin impregnating liquid which mix | blended 2-6 mass parts aqueous varnish with respect to 100 mass parts of melamine resin by solid content. The impregnation amount of the melamine resin impregnation liquid is generally 110 to 150% by mass in terms of solid content based on the base paper.
ワニスとは顔料は含まず、光沢のある透明な薄膜を形成するものを指している。本発明に用いられる水系のワニスとは、水溶液であるメラミン樹脂含浸液に混合できるものであれば特に限定するものではなく、例えばアルコールに溶解したものを用いることもできる。 A varnish does not contain a pigment and refers to an object that forms a glossy transparent thin film. The aqueous varnish used in the present invention is not particularly limited as long as it can be mixed with the melamine resin impregnating solution which is an aqueous solution, and for example, a solution dissolved in alcohol can also be used.
水系のワニスとしては、例えばスチレン−アクリル系樹脂水溶液、スチレン−アクリル系樹脂エマルジョン、塩ビ系樹脂エマルジョン等を挙げることができる。
本発明ではスチレン−アクリル系樹脂には変性したスチレン−アクリル共重合樹脂も含まれる。
具体的には、スチレン−アクリル系樹脂水溶液としては例えばＢＡＳＦジャパン社製の商品名ジョンクリル６６１０（変性したスチレン−アクリル共重合樹脂、ガラス転移点Ｔｇ＝８５℃、固形分３３．５％）、ジョンクリル７０Ｊ（ガラス転移点Ｔｇ＝１０２℃、固形分３０％）が挙げられる。
スチレン−アクリル系樹脂エマルジョンとしては、例えば大日精化製の商品名グロスレックスＯＰＷ−３３７（固形分３９％）が挙げられる。
本発明では塩ビ系樹脂エマルジョンには変性した塩ビ樹脂エマルジョンも含まれる。塩ビ系樹脂エマルジョンとしては例えば日信化学工業製の商品名ビニブラン７０１（塩ビ樹脂とアクリル系樹脂の固形分で１：１の混合物、ガラス転移点Ｔｇ＝７３℃、固形分３０％）が挙げられる。
Examples of the water-based varnish include styrene-acrylic resin aqueous solution, styrene-acrylic resin emulsion, and vinyl chloride resin emulsion.
In the present invention, the styrene-acrylic resin includes a modified styrene-acrylic copolymer resin.
Specifically, as a styrene-acrylic resin aqueous solution, for example, trade name Jonkrill 6610 (modified styrene-acrylic copolymer resin, glass transition point Tg = 85 ° C., solid content 33.5%) manufactured by BASF Japan, Joncryl 70J (glass transition point Tg = 102 ° C., solid content 30%).
Examples of the styrene-acrylic resin emulsion include trade name Gloss Rex OPW-337 (solid content 39%) manufactured by Dainichi Seika.
In the present invention, the vinyl chloride resin emulsion includes a modified vinyl resin emulsion. As the vinyl chloride resin emulsion, for example, trade name “ViniBran 701” manufactured by Nissin Chemical Industry Co., Ltd. (a 1: 1 mixture of vinyl resin and acrylic resin in solid content, glass transition point Tg = 73 ° C., solid content 30%) can be mentioned. .
水系のワニスの配合量が少ないと光沢度の改善効果が出にくい傾向にあるため、水系のワニスの配合量はメラミン樹脂の固形分１００質量部に対して２質量部以上が好ましく、３質量部以上がより好ましい。配合量が多くなると低圧メラミン化粧板の表面強度特性が低下する傾向にあるため、６質量部以下が好ましく、５質量部以下がより好ましい。表面強度特性とはひっかき硬度、耐摩耗性等である。 Since there is a tendency that the effect of improving the glossiness is less likely to occur when the amount of the aqueous varnish is small, the amount of the aqueous varnish is preferably 2 parts by mass or more with respect to 100 parts by mass of the solid content of the melamine resin. The above is more preferable. Since the surface strength characteristics of the low-pressure melamine decorative board tend to be reduced when the amount is increased, it is preferably 6 parts by mass or less, and more preferably 5 parts by mass or less. Surface strength characteristics include scratch hardness, wear resistance, and the like.
塩ビ系樹脂は環境問題を理由に使用を避ける需要があるため、汎用性の点では塩ビ系樹脂ではない方が好ましい。また、エマルジョンはメラミン樹脂含浸液に配合してからの経時での安定性の懸念があるため、水溶液の方が好ましい。 Since there is a demand for avoiding the use of a vinyl resin because of environmental problems, it is preferable that the resin is not a vinyl resin in terms of versatility. Moreover, since there exists a concern about stability over time after mix | blending an emulsion with a melamine resin impregnation liquid, the aqueous solution is more preferable.
水系のワニスは硬い方が低圧メラミン化粧板の表面強度特性の点では好ましく、ガラス転移点（Ｔｇ）が７０℃以上のものが好ましく、８０℃以上がより好ましい。一方、硬すぎると脆くなる傾向にあるため、１１０℃以下が好ましく、１０５℃以下がより好ましい。また、ガラス転移点Ｔｇ＝７０〜１１０℃、好ましくはＴｇ＝８０〜１０５℃の水系のワニスであれば２種以上を配合することもできる。 The water-based varnish is preferably hard in view of the surface strength characteristics of the low-pressure melamine decorative board, and preferably has a glass transition point (Tg) of 70 ° C. or higher, more preferably 80 ° C. or higher. On the other hand, when it is too hard, it tends to be brittle, and therefore, it is preferably 110 ° C. or lower, more preferably 105 ° C. or lower. In addition, two or more kinds of water-based varnishes having a glass transition point Tg = 70 to 110 ° C., preferably Tg = 80 to 105 ° C. may be blended.
次に、熱圧成型について説明していく。
メラミン樹脂含浸化粧板原紙をパーチクルボード、ＭＤＦ等の基材に積層し、一般的な低圧メラミン化粧板の熱圧成型条件で成型する。その際、用途によってはメラミン樹脂を含浸したオーバーレイ原紙を上層に積層して成型することもできる。また、耐衝撃性を向上させたい場合には、基材とメラミン樹脂含浸化粧板原紙の間に、メラミン樹脂またはフェノール樹脂を含浸したコア紙を積層して成型することもできる。
熱圧成型条件としては、冷却なしのホット−ホットプレスであり、成型圧力は１０〜４０ｋｇ／ｍ２、成型温度は１３０〜２５０℃、成型時間は１０秒〜３０分が一般的である。
Next, hot pressing will be described.
A melamine resin-impregnated decorative board base paper is laminated on a substrate such as a particle board or MDF, and molded under the general hot-pressure molding conditions of a low-pressure melamine decorative board. At that time, depending on the application, an overlay base paper impregnated with melamine resin can be laminated on the upper layer and molded. When it is desired to improve the impact resistance, a core paper impregnated with melamine resin or phenol resin can be laminated between the base material and the melamine resin-impregnated decorative base paper.
The hot-press molding conditions are a hot-hot press without cooling, a molding pressure of 10 to 40 kg / m 2 , a molding temperature of 130 to 250 ° C., and a molding time of 10 seconds to 30 minutes are common.
以下、実施例を挙げて本発明を詳細に説明する。
本実施例では化粧板原紙としてはＫＪ特殊紙製の成型によりベージュ色を呈する単色用化粧板原紙をベース原紙として用いた。用いたベース原紙の坪量は８１．４ｇ／ｍ２、透気度は１４秒、灰分は３０％であった。また、熱水ｐＨは７．３４であった。
Hereinafter, the present invention will be described in detail with reference to examples.
In this embodiment, a single-color decorative board base paper that exhibits a beige color by molding made of KJ special paper was used as the base base paper. The base paper used had a basis weight of 81.4 g / m 2 , an air permeability of 14 seconds, and an ash content of 30%. The hot water pH was 7.34.
次に、弱酸塩水溶液処理した化粧板原紙の作製例を示す。
［弱酸塩水溶液処理した化粧板原紙の作製例１］
ベース原紙に弱酸塩水溶液であるクエン酸／リン酸水素２ナトリウム水溶液（液濃度０．５％、クエン酸のモル数をリン酸水素２ナトリウムのモル数で割ったクエン酸／リン酸水素２ナトリウムのモル比２．７３、ｐＨ＝３．０１）をディッピング含浸により付与し、シリンダードライヤーで乾燥し、米坪８１．８ｇ／ｍ２、透気度１３秒、灰分３０％の弱酸塩水溶液処理した化粧板原紙を得た。塗布量は０．４ｇ／ｍ２であった。また、熱水ｐＨは６．１０であった。
Next, a preparation example of decorative board base paper treated with a weak acid salt aqueous solution is shown.
[Preparation example 1 of base paper for decorative board treated with weak acid aqueous solution]
Citric acid / disodium hydrogen phosphate aqueous solution (liquid concentration 0.5%, moles of citric acid divided by moles of disodium hydrogen phosphate) (Molar ratio 2.73, pH = 3.01) was applied by dipping impregnation, dried by a cylinder dryer, and treated with a weak acid salt aqueous solution having a rice basis weight of 81.8 g / m 2 , an air permeability of 13 seconds, and an ash content of 30%. A decorative base paper was obtained. The coating amount was 0.4 g / m 2 . The hot water pH was 6.10.
本実施例ではメラミン樹脂含浸液の調整と含浸は次のようにして行った。
＜メラミン樹脂含浸液の調整と含浸＞
ヘキスト社製の低圧メラミン化粧板用のメラミン樹脂である商品名マドリットＭＷ５５９の１００質量部に、硬化剤としてヘキスト社製の商品名マドリッドハードナーＭＨ８３５を０．２質量部と、浸透剤としてヘキスト社製の商品名ハイバザールＶＸＴ３７３９を１質量部を配合して水に溶解して５５質量％水溶液を調整し、メラミン樹脂含浸液を原紙基準で含浸率１３０±１０％となるよう含浸した。水系ワニスを用いる場合には、この水溶液にメラミン樹脂１００質量部に対して水系のワニスを配合して、メラミン樹脂含浸液を原紙基準で含浸率１３０±１０％となるよう含浸した。
In this example, the adjustment and impregnation of the melamine resin impregnation liquid were performed as follows.
<Adjustment and impregnation of melamine resin impregnation solution>
100 parts by mass of the brand name MW 559, which is a melamine resin for low-pressure melamine decorative boards made by Hoechst, 0.2 part by mass of the brand name Madrid Hardener MH835 made by Hoechst as a curing agent, and made by Hoechst as a penetrant 1 part by weight of the product name High Bazaar VXT3739 was dissolved in water to prepare a 55% by weight aqueous solution, and impregnated with a melamine resin impregnating solution so that the impregnation rate was 130 ± 10% based on the base paper. In the case of using an aqueous varnish, an aqueous varnish was added to 100 parts by mass of the melamine resin in this aqueous solution, and impregnated with the melamine resin impregnating solution so that the impregnation rate was 130 ± 10% based on the base paper.
本実施例では低圧メラミン化粧板の作製は次のようにして行った。
＜低圧メラミン化粧板の作製方法＞
厚さ１２ｍｍのＭＤＦにメラミン樹脂含浸化粧板原紙を積層し、熱圧成型機で１８０℃、２０ｋｇｆ／ｃｍ２、４５秒の条件でホット−ホットプレスした。尚、プレス板は艶有り仕様のものを使用している。
In this example, the low-pressure melamine decorative board was produced as follows.
<Production method of low-pressure melamine decorative board>
A melamine resin-impregnated decorative base paper was laminated on MDF having a thickness of 12 mm, and hot-hot pressing was performed with a hot press molding machine at 180 ° C., 20 kgf / cm 2 , for 45 seconds. The press plate has a glossy specification.
［実施例１］
作製例１の化粧板原紙に、水系ワニスとしてスチレン−アクリル系樹脂水溶液であるＢＡＳＦジャパン社製の商品名ジョンクリル６６１０（ガラス転移点Ｔｇ＝８５℃）をメラミン樹脂１００質量部に対して３質量部配合したメラミン樹脂含浸液を含浸し、熱圧成型して低圧メラミン化粧板を得た。
[Example 1]
3% by mass of 100% by weight of melamine resin is used for the decorative base paper of Preparation Example 1 as a water-based varnish with BASF Japan's trade name Jonkrill 6610 (glass transition point Tg = 85 ° C.), which is an aqueous styrene-acrylic resin solution. An impregnated melamine resin impregnating solution was impregnated and hot-press molded to obtain a low pressure melamine decorative board.
［実施例２］
ジョンクリル６６１０の配合量を５質量部に変更した以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Example 2]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that the amount of Joncrill 6610 was changed to 5 parts by mass.
［実施例３］
スチレン−アクリル系樹脂水溶液としてジョンクリル６６１０に変えてＢＡＳＦジャパン社製の商品名ジョンクリル７０Ｊ（ガラス転移点Ｔｇ＝１０２℃）を用いた以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Example 3]
A low-pressure melamine decorative board is obtained in the same manner as in Example 1 except that the product name Jonkrill 70J (glass transition point Tg = 102 ° C.) manufactured by BASF Japan is used instead of Jonkrill 6610 as a styrene-acrylic resin aqueous solution. It was.
［実施例４］
水系ワニスをスチレン−アクリル系樹脂エマルジョンである大日精化製の商品名グロスレックス３３７に変えた以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Example 4]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that the water-based varnish was changed to the trade name Gloss Rex 337 manufactured by Dainichi Seika Co., Ltd., which is a styrene-acrylic resin emulsion.
［実施例５］
水系ワニスを塩ビ系樹脂エマルジョンである日信化学工業製の商品名ビニブラン７０１（ガラス転移点Ｔｇ＝７３℃）に変えた以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Example 5]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that the water-based varnish was changed to the vinyl chloride resin emulsion trade name Vini Blanc 701 (glass transition point Tg = 73 ° C.) manufactured by Nissin Chemical Industry.
［比較例１］
化粧板原紙としてベース原紙を用い、水系ワニスを配合していないメラミン樹脂含浸液を用いた以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Comparative Example 1]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that a base base paper was used as a decorative board base paper and a melamine resin impregnating liquid not containing an aqueous varnish was used.
［比較例２］
水系ワニスを配合していないメラミン樹脂含浸液を用いた以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Comparative Example 2]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that a melamine resin impregnating liquid not containing an aqueous varnish was used.
［比較例３］
ジョンクリル６６１０の配合量を１質量部とした以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Comparative Example 3]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that the amount of Joncryl 6610 was 1 part by mass.
［比較例４］
ジョンクリル６６１０の配合量を７質量部とした以外は実施例１と同様にして低圧メラミン化粧板を得た。
[Comparative Example 4]
A low-pressure melamine decorative board was obtained in the same manner as in Example 1 except that the amount of Joncryl 6610 was changed to 7 parts by mass.
表１に実施例１〜３、表２に実施例４〜５、表３に比較例１〜４の低圧メラミン化粧板の評価結果を示す。
尚、評価方法は以下の方法により行った。低圧メラミン化粧板の表面強度特性としてはひっかき硬度（鉛筆法による鉛筆硬度）、耐摩耗性を評価した。
Table 1 shows evaluation results of the low-pressure melamine decorative boards of Examples 1 to 3, Table 2 to Examples 4 to 5, and Table 3 to Comparative Examples 1 to 4.
In addition, the evaluation method was performed by the following method. As surface strength characteristics of the low-pressure melamine decorative board, scratch hardness (pencil hardness by the pencil method) and abrasion resistance were evaluated.
＜光沢度の測定＞
化粧板の光沢度は、ＪＩＳ Ｚ ８７４１に基づきハンディ光沢計ＩＧ―４１０（堀場製作所製）で測定した。比較例１を基準にして比較例２をみると光沢度としては９０以上が好ましい。本実施例では比較例２を基準にして水系ワニスによる光沢度の改善効果を評価した。別途、ベース原紙を鏡面仕様の高圧メラミン化粧板に成型したものの光沢度は１０５であったため、光沢度は高圧メラミン化粧板並の１０５以上を良好とした。
<Measurement of glossiness>
The glossiness of the decorative board was measured with a handy gloss meter IG-410 (manufactured by Horiba Seisakusho) based on JIS Z 8741. When the comparative example 2 is seen on the basis of the comparative example 1, the glossiness is preferably 90 or more. In this example, the improvement effect of the glossiness by the aqueous varnish was evaluated based on Comparative Example 2. Separately, the glossiness of the base base paper molded into a high-pressure melamine decorative board with a specular surface was 105. Therefore, the glossiness was 105 or better, comparable to that of the high-pressure melamine decorative board.
＜ひっかき硬度（鉛筆法による鉛筆硬度）の測定＞
鉛筆法による鉛筆硬度の測定はＪＩＳ Ｋ ５４００で行った。数値が高い方が硬くて傷がつきにくい。比較例１の鉛筆硬度９Ｈを基準として、９Ｈで良好とした。
<Measurement of scratch hardness (pencil hardness by pencil method)>
Measurement of pencil hardness by the pencil method was performed according to JIS K 5400. Higher numbers are harder and less likely to be scratched. Based on the pencil hardness 9H of Comparative Example 1 as 9H, 9H was considered good.
＜耐摩耗性の測定＞
耐摩耗性の測定はＪＩＳ Ｋ ６９０２で行った。１００回転当たりの低圧メラミン化粧板の重量減少量（ｇ）を測定した。数値が小さい方が耐摩耗性に優れている。比較例１の測定結果０．０７１ｇを基準として、０．１００ｇ以下で可とし、０．０８０ｇ以下で良好とした。
<Measurement of wear resistance>
The abrasion resistance was measured according to JIS K 6902. The weight reduction amount (g) of the low-pressure melamine decorative board per 100 revolutions was measured. The smaller the value, the better the wear resistance. Based on the measurement result of 0.071 g in Comparative Example 1, 0.100 g or less was acceptable, and 0.080 g or less was satisfactory.
表１の結果から、本発明に相当する実施例１〜５は比較例２に比べて光沢度が高く、低圧メラミン化粧板としての傷のつきにくさ、耐摩耗性も良好であった。
一方、水系ワニスの配合量の少ない比較例３は比較例２を基準として光沢度の改善効果がまだ不十分であった。
水系ワニスの配合量の多い比較例４は低圧メラミン化粧板の傷のつきにくさと耐摩耗性が劣ることがわかる。
From the results shown in Table 1, Examples 1 to 5 corresponding to the present invention had higher gloss than Comparative Example 2, were less likely to be scratched as a low-pressure melamine decorative board, and had good wear resistance.
On the other hand, Comparative Example 3 with a small amount of water-based varnish blended with Comparative Example 2 as a reference still had insufficient gloss improvement effect.
It turns out that the comparative example 4 with many compounding quantities of a water-based varnish is inferior to the scratch resistance and abrasion resistance of a low-pressure melamine decorative board.
家具や床材等に用いられる低圧メラミン化粧板において、光沢の高い化粧板が得られるため、低圧メラミン化粧板での光沢用途への展開が期待できる。
In a low-pressure melamine decorative board used for furniture, flooring, etc., a highly glossy decorative board can be obtained.
以下、順を追って本発明を説明していく。先ず、本発明に用いる化粧板原紙について説明する。化粧板原紙はメラミン化粧板の表面化粧材として用いられている。
化粧板原紙は、ＬＢＫＰ、ＮＢＫＰ等のパルプ、色相に応じて酸化チタン、顔料、染料等と、湿潤紙力増強剤、硫酸バンド、アルミン酸ナトリウム、歩留向上剤等の製紙用の各種添加剤を含有する紙料を長網抄紙機等の抄紙機で抄造することによって得られる。尚、化粧板原紙はメラミン樹脂を高含浸するため、サイズ剤による内添や外添によるサイズ処理はしない特殊紙である。
Hereinafter, the present invention will be described step by step. First, the decorative board base paper used in the present invention will be described. The decorative board base paper is used as a surface decorative material for a melamine decorative board.
Veneer base paper, L BKP, pulp such NBKP, titanium oxide emissions in accordance with the hue, pigments, and dyes, wet strength agents, various papermaking such sulfate, sodium aluminate, retention aids It is obtained by making a paper stock containing an additive with a paper machine such as a long paper machine. Note that the decorative board base paper is a special paper that is not impregnated with a sizing agent and is not subjected to a size treatment by external addition because it is highly impregnated with melamine resin.
化粧板原紙には隠蔽性が付与されている（この点でオーバーレイ原紙とは識別される。オーバーレイ原紙には透明性が要求される）。隠蔽性とは下地の色相や色相ばらつきを覆い隠す特性をいう。一般的には酸化チタンを抄き込んで隠蔽性を付与しているが、色原紙においては、その色相によっても隠蔽性をもたせることができる。例えば、黒色原紙においては、酸化チタンは抄き込まれておらず、黒色顔料あるいは黒色染料を抄き込むことで隠蔽性を持たせている。 Hidden in veneer sheet蔽性is granted (the overlay sheet at this point is identified. Transparency is required to overlay base paper). The concealment property refers to a property of covering the hue and hue variation of the base. In general, titanium oxide is incorporated to provide concealability, but the color base paper can also be concealed by its hue. For example, in a black base paper, titanium oxide is not imprinted, and a black pigment or black dye is imprinted to provide concealability.
次に、化粧板原紙に含浸するメラミン樹脂含浸液について説明する。メラミン樹脂含浸液はメラミン樹脂を主成分とした水溶液であり、浸透剤、硬化剤、離型剤等の助剤が適宜配合されている。
メラミン樹脂としてはショートサイクルに適した硬化の速いものが好ましく、例えばヘキスト社製の低圧メラミン化粧板用のメラミン樹脂である商品名マドリットＭＷ５５９が挙げられる。硬化剤としては例えばヘキスト社製の商品名マドリッドハードナーＭＨ８３５、浸透剤としては例えばヘキスト社製の商品名ハイバザールＶＸＴ３７３９が挙げられる。
Next, the melamine resin impregnating liquid impregnated on the decorative board base paper will be described. The melamine resin impregnating liquid is an aqueous solution containing melamine resin as a main component, and auxiliary agents such as a penetrating agent, a curing agent, and a release agent are appropriately blended.
Preferably fast-curing that is suitable for sheet Yotosaikuru as melamine resins, for example, trade name Madoritto MW559 is a Hoechst melamine resin for the low-pressure melamine decorative plate and the like. Examples of the curing agent include the trade name Madrid Hardener MH835 manufactured by Hoechst, and examples of the penetrating agent include the trade name High Bazaar VXT3739 manufactured by Hoechst.
Claims (4)
The decorative base paper is a base decorative base paper whose hot water pH is adjusted to 6.5 to 7.8, and a mixed aqueous solution of citric acid and disodium hydrogen phosphate having a pH of 2.5 to 4.5. Externally added, and adjusted the external addition dry adhesion amount of the mixed aqueous solution to 0.3 to 1.0 g / m 2 so that the hot water pH of the paper after the external addition drying is in the range of 6.0 to 7.5. The method for producing a low-pressure melamine decorative board according to any one of claims 1 to 3, wherein the decorative board base paper is obtained.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113584934A (en) * | 2021-07-30 | 2021-11-02 | 常州市利德装饰材料有限公司 | Melamine hot-pressing coating method |
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