JP4731514B2 - Decorative board base paper - Google Patents
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- JP4731514B2 JP4731514B2 JP2007086869A JP2007086869A JP4731514B2 JP 4731514 B2 JP4731514 B2 JP 4731514B2 JP 2007086869 A JP2007086869 A JP 2007086869A JP 2007086869 A JP2007086869 A JP 2007086869A JP 4731514 B2 JP4731514 B2 JP 4731514B2
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本発明は、各種カウンター、テーブル、洗面所等に使用される化粧板原紙、更に詳しくはポストフォーム加工性に優れた化粧板原紙に関する。 The present invention relates to a decorative board base paper used in various counters, tables, washrooms, and the like, and more particularly to a decorative board base paper excellent in post-form processability.
化粧板は、化粧板原紙（パターン紙）、コア紙等により構成され、化粧板原紙にメラミン樹脂等の熱硬化性樹脂を含浸して表面材とし、フェノール樹脂等の熱硬化性樹脂を含浸した複数のコア紙を基材とし、これらを積層し、熱圧成型して製造される。このような化粧板の中でもカウンタートップやテーブル等に使用されるものはポストフォーム加工を必要とするものがあり、年々、その要求度は増してきている。同時に、顧客が要望する曲げの曲率半径も小さくなってきており、化粧板のポストフォーム加工性を向上させる化粧板原紙の開発の要望も高い。 The decorative board is made of decorative board base paper (pattern paper), core paper, etc., and the decorative board base paper is impregnated with a thermosetting resin such as melamine resin as a surface material and impregnated with a thermosetting resin such as phenol resin. It is manufactured by using a plurality of core papers as a base material, laminating them, and hot pressing. Among these decorative panels, some used for countertops and tables require post-form processing, and the demand is increasing year by year. At the same time, the bending radius of curvature requested by customers is becoming smaller, and there is a high demand for development of decorative board base paper that improves the post-form processability of the decorative board.
従来、化粧板にポストフォーム加工性を付与する方法としては、（１）化粧板原紙、（２）メラミン樹脂、（３）コア層及びフェノール樹脂、からの改良が知られている。
具体的には、（１）については、化粧紙に非木材繊維、合成繊維及び再生繊維を用いる方法（特許文献１）やα―セルロース含量の高いパルプを使用し、熱水抽出ｐＨが６以上であり且つ湿潤紙力剤としてメラミン系樹脂を使用する方法（特許文献２）、調成段階でアルカリ性塩を生成させ、メラミン樹脂の硬化を遅延させる方法（特許文献３）が公知であり、（２）については、メラミン樹脂を変性させたり、メラミン樹脂にｐ−トルエンスルホンアミド等の可塑剤を混合して、メラミン樹脂に可撓性を付与する方法が公知である。又、（３）については、コア紙に用いるフェノール樹脂を変性して可塑性を付与する方法やフェノール層にフィルム等の可塑性のあるシートを挟み、可塑性を付与する方法が公知である。そのほか、メラミン成型板の曲げる部分の裏側を削り、薄くして曲げやすくする等によるポストフォーム加工そのものからのポストフォーム性の改良も行われている。
Conventionally, as a method for imparting post-form processability to a decorative board, improvements from (1) decorative board base paper, (2) melamine resin, (3) core layer and phenol resin are known.
Specifically, for (1), a method using non-wood fibers, synthetic fibers and recycled fibers (Patent Document 1) or pulp having a high α-cellulose content is used for decorative paper, and the hot water extraction pH is 6 or more. And a method of using a melamine-based resin as a wet paper strength agent (Patent Document 2), a method of generating an alkaline salt at the preparation stage and delaying the curing of the melamine resin (Patent Document 3), As for 2), a method of imparting flexibility to the melamine resin by modifying the melamine resin or mixing a plasticizer such as p-toluenesulfonamide with the melamine resin is known. As for (3), a method of imparting plasticity by modifying a phenol resin used for core paper and a method of imparting plasticity by sandwiching a plastic sheet such as a film in the phenol layer are known. In addition, post-formability has been improved from post-form processing itself by cutting the back side of the bent portion of the melamine molded plate to make it thinner and easier to bend.
これらのうち、原紙の改良（上記（１））に関しては、特許文献１の方法では、高価な繊維を使用しなければならず、コスト的に高価なものになってしまうという問題がある。又、特許文献２の方法では、結晶化度の高い、結晶化度の高い高α化度セルロースを使用することからパルプの繊維間結合がされにくいため紙力強度が出難く、更には熱水抽出ｐH６以上という環境で湿潤紙力剤であるメラミン系樹脂を使用することから、特に湿潤紙力強度が十分に発現しないという問題がある。又、高α化度セルロースは一般のパルプと比較して高価である。更に、特許文献３の方法では電解質溶液を大量に使用しなければならず、系の安定性に問題がある。
このように、従来の原紙の改良では不十分であることから、化粧板のポストフォーム性への付与は、一般的な化粧紙に上記（２）あるいは（３）の方法を適用していくのが主流となっている。しかしながら、依然として、ポストフォーム性に優れた安価な化粧板原紙の供給が望まれている。
As described above, since the improvement of the conventional base paper is not sufficient, the method (2) or (3) is applied to general decorative paper for imparting the post-form property of the decorative board. Has become the mainstream. However, it is still desired to supply an inexpensive decorative board base paper excellent in post-formability.
本発明は、従来技術の持つ欠点を克服した、ポストフォーム性に優れた安価な化粧板原紙を提供することを課題とする。 An object of the present invention is to provide an inexpensive decorative board base paper excellent in post-formability that overcomes the disadvantages of the prior art.
本発明者らは、かかる課題を解決するため、鋭意検討した結果、パルプと無機填料からなる紙匹に特定のアルカリ性薬剤を付与することにより課題を解決できることを見出し、本発明に到達した。
すなわち本発明によれば、以下の化粧板原紙が提供される。
（１）繊維状物、無機填料及びアルカリ性塩を含む化粧板原紙であって、アルカリ性塩の担持量が化粧板原紙の０．３〜３．０重量％である化粧板原紙。
（２）アルカリ性塩が弱塩基性である上記（１）記載の化粧板原紙。
（３）アルカリ性塩がリン酸系、ホウ酸系又はクエン酸系である上記（１）又は（２）記載の化粧板原紙。
As a result of intensive studies in order to solve such problems, the present inventors have found that the problem can be solved by applying a specific alkaline agent to a paper sheet made of pulp and an inorganic filler, and have reached the present invention.
That is, according to the present invention, the following decorative board base paper is provided.
(1) A decorative board base paper comprising a fibrous material, an inorganic filler, and an alkaline salt, wherein the amount of the alkaline salt supported is 0.3 to 3.0% by weight of the decorative board base paper.
(2) The decorative board base paper according to (1), wherein the alkaline salt is weakly basic.
(3) The decorative board base paper according to (1) or (2), wherein the alkaline salt is phosphoric acid, boric acid or citric acid.
本発明によれば、従来技術の持つ欠点を克服した、湿潤紙力強度が高く、外観を損ねることなく、曲げの曲率半径の小さいポストフォーム性に優れた、安価な化粧板原紙が提供される。 According to the present invention, there is provided an inexpensive decorative board base paper that has overcome the drawbacks of the prior art, has high wet paper strength, and has excellent post-formability with a small bending radius of curvature without impairing the appearance. .
以下、本発明を詳細に説明する。
本発明の化粧板原紙は、繊維状物、填料、アルカリ性塩を含むものである。
用いられる繊維状物としては、従来より化粧紙に用いられてきたものを適用でき、主にＮＢＫＰ、ＬＢＫＰのような木材パルプが用いられるが、非木材繊維、合成繊維及び再生繊維や高α含有セルロースを用いることもできる。
木材パルプは、固形分濃度３〜５％になるようにパルパーで離解する。このパルプスラリーをリファイナーやビーターを用いてカナディアンショッパーフリーネスで３５０〜６００ｍｌに叩解する。
Hereinafter, the present invention will be described in detail.
The decorative board base paper of the present invention contains a fibrous material, a filler, and an alkaline salt.
As the fibrous material used, those conventionally used for decorative paper can be applied, and wood pulp such as NBKP and LBKP is mainly used, but non-wood fiber, synthetic fiber and recycled fiber and high α content Cellulose can also be used.
The wood pulp is disaggregated with a pulper so that the solid content concentration is 3 to 5%. This pulp slurry is beaten to 350-600 ml with Canadian shopper freeness using a refiner or beater.
填料としては、主に二酸化チタンが用いられるが、タルク、カオリン、炭酸カルシウム等を単独及び二酸化チタンと併用したものを用いても良い。
これら填料は、繊維状物１００重量部に対して１〜１５０重量部用いられる。
As the filler, titanium dioxide is mainly used, but talc, kaolin, calcium carbonate and the like may be used alone or in combination with titanium dioxide.
These fillers are used in an amount of 1 to 150 parts by weight per 100 parts by weight of the fibrous material.
本発明で用いられるアルカリ性塩としては、例えば、炭酸ナトリウム、炭酸水素ナトリウム、リン酸３ナトリウム、リン酸水素２ナトリウム、クエン酸３ナトリウム、クエン酸３カリウム、水酸化ナトリウム、水酸化カルシウム、等が例示されるが、弱塩基性塩、特にリン酸水素２ナトリウム、クエン酸３ナトリウムのような、リン酸系又はクエン酸系のものである。
これらのアルカリ性塩は、単独あるいは２種類以上を混合して弱塩基性水溶液として用いるか、弱酸又は弱酸性塩と混合して中性緩衝液として用いても良い。緩衝液として使用する場合、溶液のｐＨ安定性等の利点がある。緩衝液とする弱酸としては、酢酸、リン酸、クエン酸、ホウ酸、酒石酸等が例示され、弱酸性塩としては、リン酸２水素カリウム、クエン酸水素２ナトリウム、フタル酸水素カリウム等が例示される。
これらのアルカリ性塩の含有量（担持量）は、化粧板原紙の０．３〜３．０重量％である。０．３重量％よりも少ないと成型板にしたときのポストフォーム性が十分に発現しない。一方、３．０重量％よりも多いと、原紙が変色したり成型板にした際の表面性が損なわれてしまうという問題を生じる。
Examples of the alkaline salt used in the present invention include sodium carbonate, sodium bicarbonate, trisodium phosphate, disodium hydrogen phosphate, trisodium citrate, tripotassium citrate, sodium hydroxide, calcium hydroxide, and the like. Illustrative are weakly basic salts, especially those based on phosphate or citrate, such as disodium hydrogen phosphate, trisodium citrate .
These alkaline salts may be used alone or in combination as a weakly basic aqueous solution, or may be mixed with a weak acid or weakly acidic salt and used as a neutral buffer. When used as a buffer solution, there are advantages such as pH stability of the solution. Examples of the weak acid used as the buffer include acetic acid, phosphoric acid, citric acid, boric acid, and tartaric acid, and examples of the weak acid salt include potassium dihydrogen phosphate, disodium hydrogen citrate, and potassium hydrogen phthalate. Is done.
The content (supported amount) of these alkaline salts is 0.3 to 3.0% by weight of the decorative board base paper. When it is less than 0.3% by weight, the post-formability when formed into a molded plate is not sufficiently exhibited. On the other hand, if the amount is more than 3.0% by weight, there arises a problem that the surface property of the base paper when it is discolored or formed into a molded plate is impaired.
本発明では、更に各種製紙用薬品、例えば、歩留まり向上剤、湿潤紙力剤、ｐＨ調整剤、着色顔料、着色染料等を、必要により添加することができる。
歩留まり向上剤としては、硫酸アルミニウム、塩化アルミニウム、ポリ塩化アルミニウム等の無機凝結剤や、ポリアクリルアミド系、ポリエチレンイミン系、ポリアミド系の有機凝結剤、有機凝集剤が用いられる。これらは１種又は２種以上を組み合わせて用いることができる。
歩留まり向上剤は、繊維状物の０．０１〜５重量％添加される。
In the present invention, various papermaking chemicals such as a yield improver, a wet paper strength agent, a pH adjuster, a color pigment, and a color dye can be added as necessary.
As the yield improver, inorganic coagulants such as aluminum sulfate, aluminum chloride, and polyaluminum chloride, polyacrylamide, polyethyleneimine, and polyamide organic coagulants and organic coagulants are used. These can be used alone or in combination of two or more.
The yield improver is added in an amount of 0.01 to 5% by weight of the fibrous material.
湿潤紙力剤としては、ＰＡＥ系樹脂やメラミン系樹脂が用いられる。中性領域からアルカリ性領域で使用する場合は、ＰＡＥ系樹脂の方が湿潤強度発現能力に優れているので好ましい。メラミン系樹脂を使用する場合は、調成段階で酸性にしておけば良い。
湿潤紙力剤は、繊維状物の０．３〜５重量％添加される。
As the wet paper strength agent, a PAE resin or a melamine resin is used. When used in a neutral region to an alkaline region, a PAE resin is preferable because it has a higher wet strength development ability. When using a melamine-based resin, it may be acidified at the preparation stage.
The wet paper strength agent is added in an amount of 0.3 to 5% by weight of the fibrous material.
ｐＨ調整剤については、アルミン酸ナトリウム、水酸化ナトリウム等が用いられる。 As the pH adjuster, sodium aluminate, sodium hydroxide, or the like is used.
着色顔料及び着色染料としては、酸化鉄等の無機顔料や有機顔料、及び染料等が用いられる。 As the color pigment and the color dye, inorganic pigments such as iron oxide, organic pigments, dyes, and the like are used.
本発明の化粧板原紙は、パルプ、填料を含む湿式抄紙法で得られるシートにアルカリ性塩を担持させることにより、製造することができる。
例えば、叩解したパルプに、填料、及び必要に応じて各種製紙用薬品を添加し、液濃度が固形分０.０２〜２.０％程度に水で希釈し、長網抄紙機や円網抄紙機にて抄造し、その過程でアルカリ性塩の水溶液を付与する。その後、紙匹はドライヤー（乾燥ゾーン）へ移動し乾燥されることにより、アルカリ性塩が担持された化粧板原紙を製造することができる。
The decorative board base paper of the present invention can be produced by supporting an alkaline salt on a sheet obtained by a wet papermaking method containing pulp and filler.
For example, fillers and various papermaking chemicals are added to the beaten pulp, and the liquid concentration is diluted with water to a solid content of about 0.02 to 2.0%. Paper is made by a machine, and an aqueous solution of an alkaline salt is applied in the process. Thereafter, the paper sheet is moved to a dryer (drying zone) and dried, whereby a decorative base paper carrying an alkaline salt can be produced.
弱アルカリ性塩水溶液の担持法としては、オンマシンやオフマシンでの含浸法（サイズプレス法）や塗工法等が挙げられ、特に限定されるものではないが、湿紙の段階で弱アルカリ性塩をスプレー塗工等により付与させる方法は、余分な乾燥ゾーンが不要になるため好ましい。 Examples of the method of supporting the weak alkaline salt aqueous solution include an on-machine or off-machine impregnation method (size press method) and a coating method. Although not particularly limited, a weak alkaline salt solution is added at the wet paper stage. A method of applying by spray coating or the like is preferable because an extra drying zone is unnecessary.
以下、本発明を実施例により更に詳細に説明する。
尚、本実施例、比較例における評価は以下の方法で行った。
（１）ポストフォーム性
化粧板原紙にメラミン樹脂を含浸率が９０〜１１０％になるように含浸した後、９５℃の乾燥機で５分間乾燥した。このメラミンを含浸した化粧板原紙とフェノール樹脂を含浸したフェノールコア（太田コア）を積層させ、温度１３０〜１４０℃、圧力６０〜８０ｋｇ／ｃｍ２、加熱時間７分、冷却時間１０分で熱圧成型した。
作製した成型板は、ＮＥＭＡ規格（ＮＥＭＡ Ｓｔａｎｄａｒｄｓ Ｐｕｂｌｉｃａｔｉｏｎ ＬＤ ３）「ＨＩＧＨ−ＰＲＥＳＳＵＲＥ ＤＥＣＯＲＡＴＩＶＥ ＬＡＭＩＮＡＴＥＳ ３．１４ ＦＯＲＭＡＢＩＬＩＴＹ」に準じてポストフォーム加工性を評価した。なお、成型板は１６０℃に暖めて、曲げの評価を行った。
ポストフォーム性は、原紙の米坪、灰分率の影響が大きく（米坪、灰分率共に高い方がポストフォーム性には不利）、比較するサンプル間の米坪と灰分率が大きく異なっている場合は単純に数字を比較して優劣を判断することはできない。
（２）成型板表面性
成型板の表面状態を目視し、下記の基準で評価した。
○…異常無し
×…変色、ブリスター、表面荒れ等が認められる。
（３）湿潤紙力強度
ＪＩＳ Ｐ８１３５に準じて測定した。
（４）ｐＨ
横河電機株式会社製Ｍｏｄｅｌ ＰＨ８１ パーソナルｐＨメーターにより測定した。
Hereinafter, the present invention will be described in more detail with reference to examples.
In addition, evaluation in a present Example and a comparative example was performed with the following method.
(1) Post-form property After impregnating the decorative board base paper with melamine resin so that the impregnation rate is 90 to 110%, it was dried with a dryer at 95 ° C for 5 minutes. This decorative stencil base paper impregnated with melamine and a phenolic core impregnated with phenolic resin (Ota core) are laminated and heated at a temperature of 130-140 ° C., a pressure of 60-80 kg / cm 2 , a heating time of 7 minutes, and a cooling time of 10 minutes. Molded.
The produced molded plate was evaluated for post-form workability in accordance with NEMA Standard (NEMA Standards Publication LD 3) “HIGH-PRESSURE DECORATIVE LAMINATES 3.14 FORMABILITY”. The molded plate was warmed to 160 ° C. and evaluated for bending.
Post-form properties are greatly affected by the base weight and ash content of the base paper (the higher the tsubo and ash content, the more disadvantageous the post-form properties). Cannot simply compare numbers to determine superiority or inferiority.
(2) Molded plate surface property The surface state of the molded plate was visually observed and evaluated according to the following criteria.
○… No abnormality
X: Discoloration, blistering, surface roughness, etc. are observed.
(3) Wet paper strength strength Measured according to JIS P8135.
(4) pH
It measured with Model PH81 personal pH meter by Yokogawa Electric Corporation.
実施例１
ＮＢＫＰを２０重量部、ＬＤＫＰを２０重量部、ＬＢＫＰを６０重量部配合したパルプに、二酸化チタン１０５重量部、及び無機凝結剤、メラミン樹脂系湿潤紙力剤、助剤及び着色顔料を加え、アルミン酸ナトリウムでｐＨを４．９に調整した。この原材料を長網抄造し、リン酸水素２ナトリウム溶液を付与した。その後、乾燥ゾーンにて乾燥させ、米坪１５３ｇ／ｍ２、灰分４７％の化粧板原紙を得た。リン酸水素２ナトリウムの付与量は化粧板原紙の１．０重量％であった。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、及び成型板の表面状態評価を行った。
結果を表１に示す。
Example 1
A pulp containing 20 parts by weight of NBKP, 20 parts by weight of LDKP, and 60 parts by weight of LBKP is added with 105 parts by weight of titanium dioxide, an inorganic coagulant, a melamine resin-based wet paper strength agent, an auxiliary agent and a color pigment, The pH was adjusted to 4.9 with sodium acid. This raw material was made into a long web and provided with a disodium hydrogen phosphate solution. Then, it was made to dry in a drying zone, and a decorative board base paper having a rice floor of 153 g / m 2 and an ash content of 47% was obtained. The amount of disodium hydrogen phosphate applied was 1.0% by weight of the decorative board base paper.
This decorative board base paper was impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability and evaluation of the surface condition of the molded board were performed. .
The results are shown in Table 1.
実施例２
実施例１において、リン酸水素２ナトリウムの付与量を化粧板原紙の１．６重量％にした以外は、実施例１と同様に実施した。
Example 2
In Example 1, it implemented similarly to Example 1 except having made the application amount of disodium hydrogen phosphate into 1.6 weight% of the decorative board base paper.
比較例１
実施例１において、リン酸水素２ナトリウムを付与しなかった以外は、実施例１と同様に実施した。
Comparative Example 1
In Example 1, it implemented like Example 1 except not having provided disodium hydrogenphosphate.
比較例２
実施例１において、リン酸水素２ナトリウムの付与量を化粧板原紙の３．３重量％にした以外は、実施例１と同様に実施した。
Comparative Example 2
In Example 1, it carried out like Example 1 except having made the application quantity of disodium hydrogenphosphate into 3.3 weight% of the decorative board base paper.
実施例３
ＮＢＫＰを３０重量部、ＬＢＫＰを７０重量部配合したパルプに、二酸化チタン７４重量部、及び無機凝結剤、ポリアミドポリエピクロロヒドリン樹脂系湿潤紙力剤、助剤及び着色顔料を加え、アルミン酸ナトリウムでｐＨを８．９に調整した。この原材料を用いて米坪８５ｇ／ｍ２、灰分４０％の化粧板原紙を抄造し、化粧板原紙の０．７重量％のリン酸水素２ナトリウムを付与した。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、及び成型板の表面状態評価を行った。
結果を表２に示す。
Example 3
To pulp containing 30 parts by weight of NBKP and 70 parts by weight of LBKP, 74 parts by weight of titanium dioxide, an inorganic coagulant, a polyamide polyepichlorohydrin resin wet paper strength agent, an auxiliary agent and a color pigment are added, and aluminate The pH was adjusted to 8.9 with sodium. Using this raw material, a decorative board base paper having a basis weight of 85 g / m 2 and an ash content of 40% was made, and 0.7% by weight of disodium hydrogen phosphate of the decorative board base paper was applied.
This decorative board base paper was impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability and evaluation of the surface condition of the molded board were performed. .
The results are shown in Table 2.
実施例４
実施例３において、リン酸水素２ナトリウムに替えてホウ酸ナトリウムにした以外は、実施例３と同様に実施した。
Example 4
In Example 3, it implemented similarly to Example 3 except having changed into the sodium borate instead of disodium hydrogenphosphate.
比較例３
実施例３において、リン酸水素２ナトリウムを付与しなかった以外は、実施例３と同様に実施した。
Comparative Example 3
In Example 3, it implemented like Example 3 except not having provided disodium hydrogenphosphate.
比較例４
実施例３において、リン酸水素２ナトリウムに替えて炭酸ナトリウムにした以外は、実施例３と同様に実施した。
Comparative Example 4
In Example 3, it implemented similarly to Example 3 except having replaced with disodium hydrogenphosphate and using sodium carbonate.
実施例５
ＮＢＫＰを２０重量部、ＬＤＫＰを２０重量部、ＬＢＫＰを６０重量部配合したパルプに、二酸化チタン６２重量部、及び無機凝結剤、ポリアミドポリエピクロロヒドリン樹脂系湿潤紙力剤、着色顔料を加え、アルミン酸ナトリウムでｐＨを９．０に調整した。この原材料を用いて米坪１３４ｇ／ｍ２、灰分３５％の化粧板原紙を抄造し、リン酸水素２ナトリウムを化粧板原紙の１．５重量％付与した。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、成型板の表面状態評価、及び湿潤紙力強度測定を行った。
結果を表３に示す。
Example 5
To a pulp containing 20 parts by weight of NBKP, 20 parts by weight of LDKP, and 60 parts by weight of LBKP, 62 parts by weight of titanium dioxide, an inorganic coagulant, a polyamide polyepichlorohydrin resin wet paper strength agent, and a coloring pigment are added. The pH was adjusted to 9.0 with sodium aluminate. Using this raw material, a decorative board base paper having a basis weight of 134 g / m 2 and an ash content of 35% was made, and disodium hydrogen phosphate was added to 1.5% by weight of the decorative board base paper.
This decorative board base paper is impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability, evaluation of the surface condition of the molded board, and wet paper Force intensity measurements were made.
The results are shown in Table 3.
比較例５
α−セルロース含量の高いＬＤＫＰ（α化度９７％）を１００重量部配合したパルプに、二酸化チタン８０重量部、及び無機凝結剤、メラミン系湿潤紙力剤を加え、アルミン酸ナトリウムでｐＨを９．５に調整した。この原材料を用いて米坪１３２ｇ／ｍ２、灰分３９％の化粧板原紙を抄造した。
以下、実施例５と同様に実施し、ポストフォーム加工性の評価、成型板の表面状態評価、及び湿潤紙力強度測定を行った。
Comparative Example 5
80 parts by weight of titanium dioxide, an inorganic coagulant, and a melamine wet paper strength agent are added to pulp containing 100 parts by weight of LDKP having a high α-cellulose content (a degree of gelatinization of 97%), and the pH is adjusted to 9 with sodium aluminate. Adjusted to .5. Using this raw material, a decorative board base paper having a basis weight of 132 g / m 2 and an ash content of 39% was made.
Thereafter, the same procedure as in Example 5 was performed, and post-form processability evaluation, surface condition evaluation of the molded plate, and wet paper strength measurement were performed.
実施例６
ＮＢＫＰを２０重量％、ＬＤＫＰを３０重量％、ＬＢＫＰを５０重量％配合したパルプに、二酸化チタン９８重量％、及び無機凝結剤、ポリアミドポリエピクロロヒドリン樹脂系湿潤紙力剤、助剤及び着色顔料を加え、アルミン酸ナトリウムでｐＨを８．９に調整した。この原材料を用いて米坪１４２ｇ／ｍ2、灰分５０％の化粧板原紙を抄造し、クエン酸３ナトリウムを化粧板原紙の１．５重量％付与した。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、及び成型板の表面状態評価を行った。
結果を表４に示す。
Example 6
Pulp containing 20% by weight of NBKP, 30% by weight of LDKP and 50% by weight of LBKP, 98% by weight of titanium dioxide, and inorganic coagulant, polyamide polyepichlorohydrin resin-based wet paper strength agent, auxiliary agent and coloring The pigment was added and the pH was adjusted to 8.9 with sodium aluminate. Using this raw material, a decorative board base paper having a basis weight of 142 g / m 2 and an ash content of 50% was made, and trisodium citrate was added to 1.5% by weight of the decorative board base paper.
This decorative board base paper was impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability and evaluation of the surface condition of the molded board were performed. .
The results are shown in Table 4.
比較例６
実施例６において、クエン酸３ナトリウムを付与しなかった以外は、実施例６と同様に実施した。
Comparative Example 6
In Example 6, it implemented like Example 6 except not having provided trisodium citrate.
実施例７
ＮＢＫＰを２０重量％、ＬＤＫＰを３０重量％、ＬＢＫＰを５０重量％配合したパルプに、二酸化チタン７２重量％、及び無機凝結剤、ポリアミドポリエピクロロヒドリン樹脂系湿潤紙力剤、助剤及び着色顔料を加え、アルミン酸ナトリウムでｐＨを８．９に調整した。この原材料を用いて米坪１４８ｇ／ｍ2、灰分４６％の化粧板原紙を抄造し、ｐＨ７．５リン酸水素２ナトリウム／リン酸２水素カリウム緩衝液を付与した。リン酸水素２ナトリウムの付与量は化粧板原紙の２．２重量％、リン酸２水素カリウムの付与量は化粧板原紙の０．４重量％であった。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、及び成型板の表面状態評価を行った。
結果を表５に示す。
Example 7
Pulp containing 20% by weight of NBKP, 30% by weight of LDKP and 50% by weight of LBKP, 72% by weight of titanium dioxide, inorganic coagulant, polyamide polyepichlorohydrin resin wet paper strength agent, auxiliary agent and coloring The pigment was added and the pH was adjusted to 8.9 with sodium aluminate. Using this raw material, a decorative board base paper having a weight of 148 g / m 2 and an ash content of 46% was made, and a pH 7.5 disodium hydrogen phosphate / potassium dihydrogen phosphate buffer solution was applied. The amount of disodium hydrogen phosphate applied was 2.2% by weight of the decorative board base paper, and the amount of potassium dihydrogen phosphate applied was 0.4% by weight of the decorative board base paper.
This decorative board base paper was impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability and evaluation of the surface condition of the molded board were performed. .
The results are shown in Table 5.
比較例７
実施例７において、ｐＨ７．５リン酸水素２ナトリウム／リン酸２水素カリウム緩衝液を付与しなかった以外は、実施例７と同様に実施した。
Comparative Example 7
In Example 7, it implemented like Example 7 except not having provided pH7.5 disodium hydrogenphosphate / potassium dihydrogenphosphate buffer solution.
実施例８
ＮＢＫＰを２０重量％、ＬＤＫＰを３０重量％、ＬＢＫＰを５０重量％配合したパルプに、二酸化チタン１１５重量％、及び無機凝結剤、ポリアミドポリエピクロロヒドリン樹脂系湿潤紙力剤、助剤及び着色顔料を加え、アルミン酸ナトリウムでｐＨを９．０に調整した。この原材料を用いて米坪１４２ｇ／ｍ2、灰分５０％の化粧板原紙を抄造し、ｐＨ７．２リン酸水素２ナトリウム／クエン酸緩衝液を付与した。リン酸水素２ナトリウムの付与量は化粧板原紙の２．０重量％、クエン酸の付与量は化粧板原紙の０．２重量％であった。
この化粧板原紙にメラミン樹脂（日本カーバイド製；Ｓ−１７６）を含浸、乾燥し、フェノールコアを積層させ、熱圧成型後、ポストフォーム加工性の評価、及び成型板の表面状態評価を行った。
結果を表６に示す。
Example 8
Pulp containing 20% by weight of NBKP, 30% by weight of LDKP, and 50% by weight of LBKP, 115% by weight of titanium dioxide, inorganic coagulant, polyamide polyepichlorohydrin resin-based wet paper strength agent, auxiliary agent and coloring The pigment was added and the pH was adjusted to 9.0 with sodium aluminate. Using this raw material, a decorative board base paper having a basis weight of 142 g / m 2 and an ash content of 50% was made, and a pH 7.2 disodium hydrogen phosphate / citrate buffer solution was applied. The amount of disodium hydrogen phosphate applied was 2.0% by weight of the decorative board base paper, and the amount of citric acid applied was 0.2% by weight of the decorative board base paper.
This decorative board base paper was impregnated with melamine resin (manufactured by Nippon Carbide; S-176), dried, laminated with a phenol core, and after hot-press molding, evaluation of post-form processability and evaluation of the surface condition of the molded board were performed. .
The results are shown in Table 6.
実施例９
実施例８において、ｐＨ７．２リン酸水素２ナトリウム／クエン酸緩衝液に替えてｐＨ６．５リン酸水素２ナトリウム／クエン酸緩衝液を付与し、リン酸水素２ナトリウムの付与量を化粧板原紙の３．０重量％、クエン酸の付与量を化粧板原紙の０．８重量％とした以外は、実施例８と同様に実施した。
Example 9
In Example 8, pH 6.5 disodium hydrogen phosphate / citric acid buffer solution was applied instead of pH 7.2 disodium hydrogen phosphate / citrate buffer solution, and the amount of disodium hydrogen phosphate applied was determined on the decorative board base paper. This was carried out in the same manner as in Example 8, except that the amount of citric acid applied was 0.8% by weight of the decorative board base paper.
比較例８
実施例８において、ｐＨ７．２リン酸水素２ナトリウム／クエン酸緩衝液を付与しなかった以外は、実施例８と同様に実施した。
Comparative Example 8
In Example 8, it implemented like Example 8 except not having provided pH 7.2 disodium hydrogenphosphate / citrate buffer.
本発明によれば、湿潤紙力強度が高く外観を損ねることなくポストフォーム性に優れた安価な化粧板原紙が提供されるため、特に、小さな曲率半径が要求されるカウンタートップやテーブル等に使用される化粧板にも好適に用いることができる。 According to the present invention, an inexpensive decorative board base paper having high wet paper strength and excellent post-form properties without impairing the appearance is provided, so that it is used particularly for countertops and tables that require a small radius of curvature. It can also be suitably used for decorative panels.
Claims (1)
A decorative board base paper comprising a fibrous material, an inorganic filler, and a phosphoric acid-based or citric acid-based alkaline sodium salt, wherein the amount of the alkaline sodium salt supported is 0.3 to 3.0% by weight of the decorative board base paper Board base paper.
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