JP2007021929A - Formaldehyde-capturing fiberboard and its manufacturing method - Google Patents

Formaldehyde-capturing fiberboard and its manufacturing method Download PDF

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JP2007021929A
JP2007021929A JP2005208361A JP2005208361A JP2007021929A JP 2007021929 A JP2007021929 A JP 2007021929A JP 2005208361 A JP2005208361 A JP 2005208361A JP 2005208361 A JP2005208361 A JP 2005208361A JP 2007021929 A JP2007021929 A JP 2007021929A
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formaldehyde
plate
fiberboard
solution
back surface
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JP4684781B2 (en
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Tsutomu Nishio
勉 西尾
Makoto Moriguchi
誠 森口
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Nichiha Corp
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Nichiha Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiberboard that captures formaldehyde efficiently. <P>SOLUTION: A mat formed by papermaking technique is subjected to heat pressing to obtain a board-like molded product. While the board-like molded product is heated, a solution of a formaldehyde capturing agent is sprayed on the rear surface on which the meshes of a wire gauze used in the papermaking technique is transferred. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は建物の内装材、型板材、養生材、内装保護材として使用されるホルムアルデヒド捕捉性繊維板および該繊維板の製造方法に関するものである。   The present invention relates to a formaldehyde-capturing fiberboard used as a building interior material, a template material, a curing material, and an interior protection material, and a method for producing the fiberboard.

建物の内装材や家具の材料である木質板には、ホルムアルデヒドを含む接着剤やバインダーが使用されており、これが原因で室内にホルムアルデヒドが放出され、該ホルムアルデヒドによる人畜の被害が問題となっている。
そこで建物の内装材、養生材等にホルムアルデヒドを捕捉あるいは吸着する物質を含有せしめ、ホルムアルデヒド捕捉性を付与することが提案されている。
例えば特許文献1には、湿式抄造法によって形成された木質繊維板の表面にホルムアルデヒド吸着剤を含んだパラフィンワックスエマルジョンの塗布層を形成して該木質繊維板にホルムアルデヒド吸着性を付与する方法、特許文献2や特許文献3には繊維マットをホットプレスして繊維板とし、該繊維板の一面または両面に水を散布または塗布して調湿を行なう際ホルマリンキャッチャー剤を該水に添加して該繊維板にホルムアルデヒド捕捉性を付与する方法、特許文献4にはホルムアルデヒド吸着剤を含有する基材表面にホルムアルデヒドを化学的に吸着する吸着剤を含有する塗料を塗布して、ホルムアルデヒド捕捉性を付与する方法、特許文献5にはインシュレーションボードの裏面にホルムアルデヒドを化学的に吸着する吸着剤水溶液をロール塗布することによって該吸着剤の塗布層を設けてホルムアルデヒド捕捉性を付与する方法が開示されている。
Wood boards, which are building interior materials and furniture materials, use formaldehyde-containing adhesives and binders. This causes formaldehyde to be released indoors, causing damage to humans due to the formaldehyde. .
Therefore, it has been proposed to add formaldehyde-capturing properties to building interior materials, curing materials, etc. by adding substances that capture or adsorb formaldehyde.
For example, Patent Document 1 discloses a method for forming a coated layer of a paraffin wax emulsion containing a formaldehyde adsorbent on the surface of a wood fiber board formed by a wet papermaking method to impart formaldehyde adsorption to the wood fiber board, Patent In Document 2 and Patent Document 3, a fiber mat is hot-pressed to form a fiber board, and when adjusting moisture by spraying or applying water to one or both surfaces of the fiber board, a formalin catcher agent is added to the water to A method for imparting formaldehyde scavenging to a fiberboard. Patent Document 4 applies formaldehyde scavenging by applying a paint containing an adsorbent that chemically adsorbs formaldehyde on the surface of a substrate containing formaldehyde adsorbent. Method, Patent Document 5 discloses an adsorbent aqueous solution that chemically adsorbs formaldehyde on the back surface of an insulation board. Method for imparting formaldehyde scavenging by providing a coating layer of the adsorbent by roll coating is disclosed.

特開2005−28797号公報JP-A-2005-28797 特開昭62−1501号公報JP-A-62-1501 特開平6−293009号公報Japanese Patent Laid-Open No. 6-293209 特開2000−356022号公報JP 2000-356022 A 特開2005−111701号公報JP 2005-111701 A

上記木質繊維板表面にホルムアルデヒド吸着剤を含んだパラフィンワックスエマルジョンを塗布する方法では、該エマルジョン中のパラフィンワックスによって上記ホルムアルデヒド吸着剤が板表面に固着されるが、パラフィンワックスの存在によって該エマルジョンに含まれているホルムアルデヒド吸着剤を木質繊維板の内部にまで浸透させることが困難であり、またパラフィンワックスの塗膜は強度に乏しく、上記ホルムアルデヒド吸着剤が剥離し易いし、パラフィンワックスが該吸着剤の表面を被覆して該吸着剤の吸着能力を悪化させるおそれがある。また繊維板調湿時に使用する水にホルマリンキャッチャー剤を添加する方法では、ホルマリンキャッチャー剤の量に比べて、圧倒的に大量の水を使用するので散布する水が周囲に飛び散って吸着剤のロスが大きくなり、ホルマリンキャッチャー剤のボード面の歩留まりが非常に悪くなる。このため、期待するホルマリンキャッチャー能力は得にくゝなる。またホルマリンキャッチャー剤を有効に作用させるために、更に多量の水と併用すると、繊維板が水を吸収し過ぎ、ねじれや反りが発生する。
また更に、湿式法では、繊維板を高温に維持している間に、水を散布または塗布すると表面側は不均一に膨潤して外観不良となる。また更にホルムアルデヒドを化学的に吸着する吸着剤の水溶液をロール塗布することによって該吸着剤の塗布層を設ける方法も、該吸着剤をインシュレーションボード内部にまで浸透させないと、該吸着剤が剥離し易い。
即ち上記従来技術では、繊維板に耐久性のあるホルムアルデヒド捕捉性を付与することは困難であった。
In the method of applying a paraffin wax emulsion containing a formaldehyde adsorbent to the surface of the wood fiber board, the formaldehyde adsorbent is fixed to the board surface by the paraffin wax in the emulsion, but it is contained in the emulsion due to the presence of the paraffin wax. It is difficult to permeate the formaldehyde adsorbent into the inside of the wood fiberboard, and the coating film of paraffin wax is poor in strength, the formaldehyde adsorbent is easy to peel off, and paraffin wax is There is a possibility of covering the surface and deteriorating the adsorption ability of the adsorbent. Also, in the method of adding formalin catcher to the water used when conditioning the fiberboard, the amount of water used is overwhelming compared to the amount of formalin catcher, so the sprayed water splatters and the adsorbent is lost. And the yield of the board surface of the formalin catcher agent becomes very bad. For this reason, the expected formalin catcher ability is difficult to obtain. In addition, when the formalin catcher agent is used in an effective manner, when it is used in combination with a larger amount of water, the fiberboard absorbs water too much, causing twisting and warping.
Further, in the wet method, when water is sprayed or applied while the fiberboard is maintained at a high temperature, the surface side swells unevenly, resulting in poor appearance. Furthermore, in the method of forming the adsorbent coating layer by roll-coating an aqueous solution of an adsorbent that chemically adsorbs formaldehyde, the adsorbent peels off unless the adsorbent penetrates into the insulation board. easy.
That is, with the above-described conventional technology, it has been difficult to impart durable formaldehyde scavenging properties to the fiberboard.

本発明は上記従来の課題を解決するための手段として、パルプを主体とするスラリーを抄造して抄造マットをフォーミングし、該抄造マットを加熱プレスして板状成形物とし、該板状成形物の裏面に加熱状態でホルムアルデヒド捕捉剤溶液をスプレーし、該ホルムアルデヒド捕捉剤溶液の溶媒を急速に蒸発せしめたホルムアルデヒド捕捉性繊維板を提供するものである。
更に本発明はパルプを主体とするスラリーを抄造して抄造マットをフォーミングし、該抄造マットを加熱プレスして板状成形物とし、該板状成形物の裏面に加熱状態でホルムアルデヒド捕捉剤溶液をスプレーし、該ホルムアルデヒド捕捉剤溶液の溶媒を急速に蒸発せしめ、このようにしてホルムアルデヒド捕捉剤を裏面に付着含浸せしめた板状成形物を常温に冷却した後、該板状成形物の裏面に水打ちを行ないつゝ該板状成形物表面にホルムアルデヒド捕捉剤溶液を塗布し乾燥したホルムアルデヒド捕捉性繊維板の製造方法を提供するものである。
上記板状成形物の密度は0.8〜1.2g/cm3 であることが望ましい。
As a means for solving the above-described conventional problems, the present invention forms a paper mat by forming a slurry mainly composed of pulp, and heat-presses the paper mat to form a plate-shaped product. A formaldehyde scavenger solution is sprayed in the heated state on the back surface of the film, and the formaldehyde scavenger fiberboard in which the solvent of the formaldehyde scavenger solution is rapidly evaporated is provided.
Furthermore, the present invention forms a paper mat by forming a slurry mainly composed of pulp, heat-presses the paper mat to form a plate-shaped product, and a formaldehyde scavenger solution is heated on the back surface of the plate-shaped product. After spraying, the solvent of the formaldehyde scavenger solution is rapidly evaporated, and after cooling the plate-shaped molded article in which the formaldehyde scavenger is adhered and impregnated on the back surface to room temperature, water is applied to the back surface of the plate-shaped molded article. The present invention provides a method for producing a formaldehyde-trapping fiberboard, which is formed by applying a formaldehyde scavenger solution onto the surface of the plate-shaped molded article and drying it.
The density of the plate-shaped molded product is desirably 0.8 to 1.2 g / cm 3 .

〔作用〕
本発明の繊維板はパルプを主体とするスラリーを抄造してフォーミングされた抄造マットを加熱プレスすることによって製造される。上記加熱プレスによって得られた板状成形物は、裏面に抄造の際の網目が転写され、それによって粗面になっている。
そこで該板状成形物の裏面に加熱状態でホルムアルデヒド捕捉剤溶液をスプレーすると、該溶液はミストとなって該板状成形物表面に塗布され、該板状成形物の粗面状態の裏面から内部に浸透するが、加熱されることによって該溶液ミスト中の溶媒は急速に蒸発し、、密度0.8〜1.2g/cm3 の硬質な板状成形物であっても、その蒸気圧によって該溶液中のホルムアルデヒド捕捉剤は更に該板状成形物の内部に押し込まれる。
またその際該ホルムアルデヒド捕捉剤溶液中の溶媒は、該板状成形物に接触した時点で急速に蒸発し、該板状成形物内には殆ど残らなくなるので、該溶媒の吸収しすぎによる繊維板の性能の低下や反り、ねじれの発生はなくなる。このようにして該ホルムアルデヒド捕捉剤は、該板状成形物の裏面上にとどまらず、裏面よりある程度内部に浸透した状態でとどまって固着するようになるので、該板状成形物を製品化して繊維板とした時、該繊維板の裏面近傍にホルムアルデヒド捕捉剤が高濃度でとどまっており、該繊維板は耐久性のある優れたホルムアルデヒド捕捉性を有することになる。
上記板状成形物は、冷却後裏面から調湿のために水をスプレーあるいは塗布しても、該ホルムアルデヒド捕捉剤は前記したように裏面より若干内部に浸透した状態でとどまって固着しているから、調湿のために水に溶出してしまうような不具合は回避出来る。そこで、上記調湿時に上記ホルムアルデヒド捕捉剤溶液を、該板状成形物の表面にスプレーまたは塗布すれば、表裏面がホルムアルデヒド捕捉性を有する繊維板が得られる。
なお加熱状態で、表面にホルムアルデヒド捕捉剤溶液をスプレーすると、表面側は組織が粗な裏面側と異なり緻密となっているので、組織が膨潤して外観不良となる。
[Action]
The fiberboard of the present invention is produced by heating and pressing a papermaking mat formed by papermaking a slurry mainly composed of pulp. The plate-like molded product obtained by the above-described hot press has a rough surface by transferring the mesh at the time of papermaking to the back surface.
Therefore, when the formaldehyde scavenger solution is sprayed in the heated state on the back surface of the plate-shaped molded product, the solution is applied as a mist to the surface of the plate-shaped molded product, and the inside of the plate-shaped molded product from the rough surface back surface However, when heated, the solvent in the solution mist rapidly evaporates, and even a hard plate-shaped molded product having a density of 0.8 to 1.2 g / cm 3 depends on the vapor pressure. The formaldehyde scavenger in the solution is further pushed into the plate-shaped molding.
Further, at that time, the solvent in the formaldehyde scavenger solution rapidly evaporates when it comes into contact with the plate-shaped molded article, and hardly remains in the plate-shaped molded article. Therefore, the fiber board due to excessive absorption of the solvent. No performance degradation, warping or twisting occurs. In this way, the formaldehyde scavenger does not stay on the back surface of the plate-shaped molded product, but stays and adheres to the inside to some extent from the back surface. When a board is used, the formaldehyde scavenger stays at a high concentration in the vicinity of the back surface of the fiber board, and the fiber board has an excellent formaldehyde scavenging property with durability.
Even if the plate-shaped molded product is sprayed or coated with water for conditioning from the back side after cooling, the formaldehyde scavenger stays in the inside slightly from the back side as described above and is fixed. In addition, problems such as elution into water due to humidity control can be avoided. Therefore, if the formaldehyde scavenger solution is sprayed or applied to the surface of the plate-shaped molded product at the time of humidity control, a fiberboard having front and back surfaces having formaldehyde scavenging properties can be obtained.
In addition, when the formaldehyde scavenger solution is sprayed on the surface in a heated state, the surface side is dense unlike the rough back side, so that the tissue swells and the appearance becomes poor.

〔効果〕
したがって本発明においては、耐久性のあるホルムアルデヒド捕捉性を有する繊維板を容易に製造することが出来る。
〔effect〕
Therefore, in the present invention, it is possible to easily produce a fiberboard having a formaldehyde scavenging property having durability.

本発明を以下に詳細に説明する。
〔スラリー調製〕
本発明において使用するパルプは、木材を原料とし、該木材のチップを機械的処理することによってパルプ化するメカニカルパルプ、化学的処理することによってパルプ化するケミカルパルプ、機械的処理と化学的処理を併用してパルプ化するセミグラウンドパルプのいずれもが使用出来る。
上記パルプは通常3質量%程度の濃度で水に分散されスラリーとされる。更に通常フェノール樹脂、メラミン樹脂、尿素樹脂等の熱硬化性樹脂バインダーを上記スラリーに対して0.5〜1.5質量%程度、パラフィンワックス、シリコン化合物、ジルコニウム化合物等の撥水剤を上記スラリーに対して0.5〜1.5質量%、その他必要に応じて防腐剤、老化防止剤等を添加する。
The present invention is described in detail below.
[Slurry preparation]
The pulp used in the present invention is made from wood as a raw material, mechanical pulp which is pulped by mechanically treating the wood chips, chemical pulp which is pulped by chemical treatment, mechanical treatment and chemical treatment Any semi-ground pulp that is pulped in combination can be used.
The pulp is usually dispersed in water at a concentration of about 3% by mass to form a slurry. Furthermore, a thermosetting resin binder such as a phenol resin, a melamine resin, or a urea resin is usually about 0.5 to 1.5% by mass with respect to the slurry, and a water repellent such as a paraffin wax, a silicon compound, or a zirconium compound is added to the slurry. 0.5 to 1.5 mass% with respect to the other, and other antiseptics, anti-aging agents and the like are added as necessary.

〔抄造〕
上記スラリーは通常パルプ濃度として1〜1.5質量%程度に希釈して抄造に使用される。抄造には丸網法、長網法、チャップマン法等の公知の方法が適用される。いずれの方法においても、金網上に該スラリーを流し出し、金網裏面から真空吸引脱水を行なってウェットマットをフォーミングする。
上記ウェットマットにあっては、表面側ではパルプは長手方向が略水平方向になるように配向され、裏面側(金網側)では真空吸引力によって長手方向が略垂直になるように配向され、かつパルプ密度は表面側では比較的高く、裏面側では比較的低くなっており、更に裏面は金網の網目が転写されることによって粗面になっている。上記ウェットマットは所望なれば冷間プレスによってドライネスが約30〜40%になるまで脱水される。
[Paper making]
The slurry is usually used for papermaking after being diluted to a pulp concentration of about 1 to 1.5% by mass. For papermaking, known methods such as the round net method, the long net method, and the Chapman method are applied. In either method, the slurry is poured out onto a wire mesh, and vacuum wet dehydration is performed from the back surface of the wire mesh to form a wet mat.
In the wet mat, the pulp is oriented so that the longitudinal direction is substantially horizontal on the front side, and is oriented so that the longitudinal direction is substantially vertical by vacuum suction on the back side (wire mesh side), and The pulp density is relatively high on the front surface side and relatively low on the back surface side, and the back surface is roughened by transferring a mesh of a wire mesh. If desired, the wet mat is dewatered by cold pressing until the dryness is about 30-40%.

〔加熱プレス〕
上記ウェットマットは次いで加熱プレスされる。上記加熱プレスは通常180℃〜220℃程度の温度で行なわれるが、プレス圧力は例えば40kg/cm2 、50〜60秒、8〜10kg/cm2 、60〜90秒、20〜25kg/cm2 、60〜90秒の三段階のプレス方式によって行なわれる。上記三段階のプレス方式では、中間で圧力を低下してウェットマットに含まれている水分や空気が抜け易くし(息抜き工程)、ウェットマットのパンク現象が防止される。なおプレス装置は上型と下型とを備えるが、下型型面に金網や多孔板をスペーサーとして敷設し、該ウェットマットから搾出される水の排水を図る。前記したように、該ウェットマットの裏面側においてはパルプが長手方向を略垂直にして配向され、また比較的低密度になっているから、ウェットマットからの水の搾出は、該パルプ間にガイドされて円滑に行なわれる。
前記したように該ウェットマットにはホルムアルデヒドを含む熱硬化性樹脂バインダーが若干含まれているが、上記加熱プレスによって該樹脂中のホルムアルデヒドは遊離して殆ど揮発してしまう。
[Heating press]
The wet mat is then hot pressed. Although the heat pressing is carried out at a temperature of usually about 180 ° C. to 220 ° C., pressing pressure e.g. 40kg / cm 2, 50~60 seconds, 8~10kg / cm 2, 60~90 seconds, 20~25kg / cm 2 , By a three-stage press method of 60 to 90 seconds. In the above three-stage press method, the pressure is lowered in the middle so that moisture and air contained in the wet mat can be easily removed (breathing process), and the puncture phenomenon of the wet mat is prevented. The press device includes an upper die and a lower die, and lays a wire net or a perforated plate as a spacer on the surface of the lower die to drain water squeezed from the wet mat. As described above, on the back side of the wet mat, the pulp is oriented with the longitudinal direction being substantially vertical, and has a relatively low density. Guided and smooth.
As described above, the wet mat contains some thermosetting resin binder containing formaldehyde, but the formaldehyde in the resin is liberated and almost volatilized by the heating press.

〔ホルムアルデヒド捕捉剤の含浸〕
このようにしてプレス成形された板状成形物は裏面側を上向きにするために裏返しにされ、上記加熱プレスにより該板状成形物が加熱状態にあるうちにホルムアルデヒド捕捉剤の溶液が該板状成形物裏面に上方からスプレーされる。上方からスプレーする方法は、下方からスプレーする方法に比べて、ホルムアルデヒド捕捉剤の歩留まりが圧倒的によく、殆ど繊維板に留まることになると云う利点がある。この利点のために設備も汚れにくゝなり、ホルムアルデヒド捕捉剤を回収するための設備も不要となる。
上記ホルムアルデヒド捕捉剤としては、イミノ基、アミノ基、アミド基、メチロール基等ホルムアルデヒドと反応可能な官能基を有する化合物が使用される。例えば上記官能基がアミノ基の場合にはホルムアルデヒドは下記の反応によって捕捉される。
〜H2N+HCHO→〜HNCH2OH
〜HNCH2OH+HOCH2NH〜→〜HNCH2OH2CNH〜+H2
〜HNCH2OH+H2N〜→〜HNCH2NH〜+H2
上記化合物としては、例えばイミダゾール類としてイミダゾリジノン、イミド類としては、ジアセチルイミド、フタルイミド、アミン類としては、メラミン、ナフチルアミン、シクロヘキシルアミン、ジアミルアミン、アミド類としては、尿素、エチレン尿素、プロピレン尿素、5−ヒドロキシプロピレン尿素、5−メトキシフロピレン尿素、5−メチルプロピレン尿素、パラバン酸(グリオキザールモノウレイン)、4,5−ジメトキシエチレン尿素、ピロリジン、ピペリジン、モルホリン、ジシアンジアミドもしくはその誘導体が例示される。
上記化合物はホルムアルデヒドと反応して捕捉し、そして捕捉したホルムアルデヒドを解離させない。
[Impregnation of formaldehyde scavenger]
The plate-shaped molded product thus press-molded is turned inside out so that the back side faces upward, and the solution of the formaldehyde scavenger is added to the plate-shaped product while the plate-shaped molded product is heated by the heating press. Sprayed from above on the back of the molding. The method of spraying from above has the advantage that the yield of the formaldehyde scavenger is overwhelmingly better than the method of spraying from below and almost remains on the fiberboard. Because of this advantage, the equipment is less likely to become dirty, and no equipment is needed to recover the formaldehyde scavenger.
As the formaldehyde scavenger, a compound having a functional group capable of reacting with formaldehyde such as imino group, amino group, amide group, methylol group is used. For example, when the functional group is an amino group, formaldehyde is captured by the following reaction.
~ H 2 N + HCHO → ~ HNCH 2 OH
~HNCH 2 OH + HOCH 2 NH~ → ~HNCH 2 OH 2 CNH~ + H 2 O
~HNCH 2 OH + H 2 N~ → ~HNCH 2 NH~ + H 2 O
Examples of the compound include imidazolidinone as imidazoles, diacetylimide, phthalimide as imides, melamine, naphthylamine, cyclohexylamine, diamylamine, and amides as urea, ethyleneurea, propyleneurea, Examples include 5-hydroxypropyleneurea, 5-methoxypropyleneurea, 5-methylpropyleneurea, parabanic acid (glyoxal monourene), 4,5-dimethoxyethyleneurea, pyrrolidine, piperidine, morpholine, dicyandiamide or derivatives thereof. .
The compound reacts with and traps formaldehyde and does not dissociate the trapped formaldehyde.

上記ホルムアルデヒド捕捉剤は、通常5〜40質量%程度の濃度の水溶液とされるが、溶媒としては水の他、メタノール、エタノール、イソプロパノール、アセトン等の水溶性有機溶媒が水と共にあるいは水に代えて使用されてもよい。更に上記溶液には例えばアニオン性、ノニオン性、カチオン性の界面活性剤が浸透剤として添加されてもよい。該界面活性剤としては、例えばアニオン性界面活性剤は高級アルコールサルフェート(Na塩またはアミン塩)、アルキルアリルスルフォン酸塩(Na塩またはアミン塩)、アルキルナフタレンスルフォン酸塩(Na塩またはアミン塩)、アルキルナフタレンスルフォン酸塩縮合物、アルキルフォスフェート、ジアルキルスルフォサクシネート、ロジン石鹸、脂肪酸塩(Na塩またはアミン塩)等があり、ノニオン性界面活性剤はポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェノールエーテル、ポリオキシエチレンアルキルエステル、ポリオキシエチレンアルキルアミン、ポリオキシエチレンアルキロールアミン、ポリオキシエチレンアルキルアマイド、ソルビタンアルキルエステル、ポリオキシエチレンソルビタンアルキルエステル等があり、カチオン性界面活性剤はオクタデシルアミンアセテート、イミダゾリン誘導体アセテート、ポリアルキレンポリアミン誘導体またはその塩、オクタデシルトリメチルアンモニウムクロライド、トリメチルアミノエチルアルキルアミドハロゲニド、アルキルピリジニウム硫酸塩、アルキルトリメチルアンモニウムハロゲニド等がある。   The formaldehyde scavenger is usually an aqueous solution having a concentration of about 5 to 40% by mass, but as a solvent, water or a water-soluble organic solvent such as methanol, ethanol, isopropanol, or acetone is used together with water or in place of water. May be used. Further, for example, an anionic, nonionic or cationic surfactant may be added as a penetrating agent to the solution. As the surfactant, for example, anionic surfactants include higher alcohol sulfate (Na salt or amine salt), alkyl allyl sulfonate (Na salt or amine salt), alkyl naphthalene sulfonate (Na salt or amine salt). , Alkyl naphthalene sulfonate condensate, alkyl phosphate, dialkyl sulphosuccinate, rosin soap, fatty acid salt (Na salt or amine salt), etc. Nonionic surfactants are polyoxyethylene alkyl ether, polyoxyethylene Alkylphenol ether, polyoxyethylene alkyl ester, polyoxyethylene alkylamine, polyoxyethylene alkylolamine, polyoxyethylene alkylamide, sorbitan alkyl ester, polyoxyethylene sorbita There are alkyl esters and the like, and cationic surfactants include octadecylamine acetate, imidazoline derivative acetate, polyalkylene polyamine derivative or salt thereof, octadecyltrimethylammonium chloride, trimethylaminoethylalkylamide halide, alkylpyridinium sulfate, alkyltrimethylammonium halogen. There are Nido etc.

上記ホルムアルデヒド捕捉剤溶液を上記板状成形物裏面にスプレーする場合、前記板状成形物は前記したように加熱状態にあるが、その温度としては80℃〜180℃、望ましくは100℃〜160℃の範囲にあることが望ましい。またスプレー量は通常1〜2g/尺2 程度に設定される。 When the formaldehyde scavenger solution is sprayed on the back side of the plate-shaped molded product, the plate-shaped molded product is in a heated state as described above, and the temperature is 80 ° C to 180 ° C, preferably 100 ° C to 160 ° C. It is desirable to be in the range. The spray amount is usually set to about 1 to 2 g / scale 2 .

上記ホルムアルデヒド捕捉剤溶液をスプレーするとミストになって該板状成形物裏面に塗布されるが、該板状成形物裏面は前記したように網目の転写による粗面になっており、更に該板状成形物中のパルプは裏面付近では略垂直方向に配向され、また比較的低密度になっているから該溶液は該裏面から該板状成形物内部に効率的に浸透する。しかし該溶液はミスト状で該板状成形物裏面に塗布されるので、該溶液中の溶媒は急速に蒸発し、その蒸気圧によっても該ホルムアルデヒド捕捉剤は該板状成形物内部に押し込まれる。しかし該溶媒は上記したように急速に蒸発するから、該溶液は該板状成形物の深部までは達せず、該板状成形物の溶媒含浸による歪の発生の問題は生じない。このようにして該ホルムアルデヒド捕捉剤は、該板状成形物の裏面よりある程度内部に浸透した状態でとどまって固着するようになるから、該板状成形物裏面近傍のホルムアルデヒド捕捉剤の濃度は高くなる。
該溶液スプレー後は該板状成形物は室温にまで冷却される。
When the formaldehyde scavenger solution is sprayed, it forms a mist and is applied to the back side of the plate-like molded product. The back side of the plate-like molded product has a rough surface due to the transfer of the mesh as described above, and further The pulp in the molded product is oriented in a substantially vertical direction near the back surface and has a relatively low density, so that the solution efficiently penetrates into the plate-shaped product from the back surface. However, since the solution is applied in the form of a mist on the back side of the plate-shaped molded product, the solvent in the solution rapidly evaporates, and the formaldehyde scavenger is pushed into the plate-shaped molded product by the vapor pressure. However, since the solvent evaporates rapidly as described above, the solution does not reach the deep part of the plate-like molded product, and the problem of generation of strain due to the solvent impregnation of the plate-like molded product does not occur. In this way, the formaldehyde scavenger stays and fixes in a state where it has penetrated to some extent from the back surface of the plate-like molded product, so that the concentration of the formaldehyde scavenger in the vicinity of the back surface of the plate-shaped product becomes high. .
After the solution spraying, the plate-shaped product is cooled to room temperature.

〔調湿〕
該板状成形物は冷却後、裏面に水を散布して該板状成形物の全体的な含水量を調節する。この際、ホルムアルデヒド捕捉剤は裏面からある程度内部に浸透した状態で、しかも固着しているから、該水に殆ど溶出しない。
上記調湿と同時に所望なれば該板状成形物表面には該ホルムアルデヒド捕捉剤溶液が塗布される。該溶液の塗布はスプレー塗布が一般的であるが、ロールコーティング、ナイフコーティング、カーテンフローコーティング等が適用されてもよい。
[Humidity control]
After cooling the plate-shaped molded product, water is sprayed on the back surface to adjust the overall water content of the plate-shaped molded product. At this time, the formaldehyde scavenger penetrates into the interior to some extent from the back surface and is fixed, so that it hardly dissolves in the water.
If desired, the formaldehyde scavenger solution is applied to the surface of the plate-shaped molded article simultaneously with the humidity control. The solution is generally applied by spraying, but roll coating, knife coating, curtain flow coating or the like may be applied.

〔サンディング処理〕
上記調湿後は該板状成形物即ち繊維板は堆積して1〜2日間養生され、その後所定寸法に切断され、表面をサンディング処理され、厚みを調節される。
上記サンディング処理によって該繊維板表面には微細な毛羽立ちが形成され、表面積が増加するから、繊維板表面に該ホルムアルデヒド捕捉剤溶液を塗布した場合には、周囲のホルムアルデヒドに対する該捕捉剤の接触面積も増大し、ホルムアルデヒド捕捉効率が向上する。
上記ホルムアルデヒド捕捉剤溶液は、上記サンディング処理の後に塗布されてもよい。この場合には繊維板表面が上記サンディング処理によってポーラスになっているから、上記溶液が繊維板表面から内部に良好に浸透する。
[Sanding treatment]
After the above humidity control, the plate-like molded product, that is, the fiberboard is deposited and cured for 1 to 2 days, then cut to a predetermined size, the surface is sanded, and the thickness is adjusted.
By the sanding process, fine fluff is formed on the fiberboard surface and the surface area is increased. Therefore, when the formaldehyde scavenger solution is applied to the fiberboard surface, the contact area of the scavenger with the surrounding formaldehyde is also increased. And formaldehyde capture efficiency is improved.
The formaldehyde scavenger solution may be applied after the sanding process. In this case, since the fiberboard surface is made porous by the sanding process, the solution penetrates well from the fiberboard surface to the inside.

以下に本発明を実施例により更に具体的に説明する。
〔実施例〕
下記の成分を水に分散させて、パルプ濃度として3質量%のスラリーを調製した。
メカニカルパルプ(平均長1cm) 100質量部
フェノール樹脂 1 〃
パラフィンワックス 1 〃
上記スラリーは更にパルプ濃度として1.2質量%に希釈され、金網上に流し出し、裏面から真空脱水してウェットマットをフォーミングした。
上記ウェットマットは冷間プレスによってドライネス(数1参照)を35質量%に調節し、その後200℃の加熱プレスが行なわれた。加熱プレス条件は40kg/cm2 圧,50秒、9kg/cm2 圧,70秒、23kg/cm2 圧,80秒に設定した。
Hereinafter, the present invention will be described more specifically with reference to examples.
〔Example〕
The following components were dispersed in water to prepare a slurry having a pulp concentration of 3% by mass.
Mechanical pulp (average length: 1 cm) 100 parts by mass Phenolic resin 1 〃
Paraffin wax 1 〃
The slurry was further diluted to a pulp concentration of 1.2% by mass, poured onto a wire mesh, vacuum dehydrated from the back surface, and formed a wet mat.
The wet mat was adjusted to a dryness (see Equation 1) of 35% by mass by cold pressing, and then was heated at 200 ° C. The heating press conditions were set to 40 kg / cm 2 pressure, 50 seconds, 9 kg / cm 2 pressure, 70 seconds, 23 kg / cm 2 pressure, 80 seconds.

Figure 2007021929
Figure 2007021929

加熱プレス後得られた板状成形物は裏面を上側にしてセットされ、有機アミド系ホルマリンキャッチャー剤(三木理研工業株式会社製FC−478T)を原液(濃度30wt%)にて該板状成形物裏面に1g/尺2 の量でスプレー塗布した。
該溶液スプレー塗布時の該板状成形物の温度は150℃に設定した。
該溶液スプレー後は得られた繊維板試料を室温になるまで放置し、更に7日養生後にホルムアルデヒド捕捉試験を行なった。
The plate-shaped product obtained after hot pressing was set with the back side up, and the plate-shaped product was prepared with an organic amide formalin catcher agent (FC-478T manufactured by Miki Riken Kogyo Co., Ltd.) in the stock solution (concentration 30 wt%) The back surface was spray coated at an amount of 1 g / scale 2 .
The temperature of the plate-shaped molded product during the solution spray coating was set to 150 ° C.
After the solution spraying, the obtained fiberboard sample was allowed to stand until it reached room temperature, and further subjected to a formaldehyde capture test after curing for 7 days.

〔試験方法〕
試料(横巾50mm,縦長150mm,厚さ2.5mm)を5Lテドラーバッグ容器に入れ、ホルムアルデヒド30ppmを該容器に注入し、該容器内温度を20℃に保って該容器内のホルムアルデヒドの経時的濃度変化を検知管(株式会社ガステック製)によって測定した。
結果を表1に示す。
〔Test method〕
A sample (width 50 mm, length 150 mm, thickness 2.5 mm) is placed in a 5 L Tedlar bag container, 30 ppm of formaldehyde is injected into the container, the temperature in the container is kept at 20 ° C., and the concentration of formaldehyde in the container over time The change was measured by a detector tube (manufactured by Gastec Co., Ltd.).
The results are shown in Table 1.

Figure 2007021929
比較試料1 0/尺2
比較試料2 1g/尺2
*1:比較試料2は、繊維板を室温に冷却した後、ホルムアルデヒド捕捉剤溶液を繊維板 表面にスプレー塗布した。
*2:24時間放置後容器内を50℃に加熱してホルムアルデヒド濃度を測定した。
Figure 2007021929
Comparative sample 1 0 / scale 2
Comparative sample 2 1g / scale 2
* 1: In Comparative Sample 2, after cooling the fiberboard to room temperature, the formaldehyde scavenger solution was spray-coated on the fiberboard surface.
* 2: After standing for 24 hours, the inside of the container was heated to 50 ° C. to measure the formaldehyde concentration.

表1を参照すると、本発明の試料は良好なホルムアルデヒド捕捉性を示し、3時間放置した場合には殆どホルムアルデヒドが検出されないレベルに達する。そして50℃に加熱しても解離してくるホルムアルデヒドは全く検出されず、本発明の試料ではホルムアルデヒドは確実に捕捉され解離しないことが確認された。
ホルムアルデヒド捕捉剤溶液を塗布しない比較試料1でも繊維板の多孔性によってホルムアルデヒドは吸着されるが、吸着量は本発明の試料に比してはるかに少なく、またホルムアルデヒドは物理的に吸着されているに過ぎず、加熱によって遊離し易い。
また繊維板表面に該ホルムアルデヒド捕捉剤溶液を塗布した比較試料2は、裏面に塗布した本発明の試料に比して捕捉能は劣り、24時間経過後にホルムアルデヒドの量は0になるが、50℃の加熱によってホルムアルデヒドが解離し、ホルムアルデヒド濃度が0.1ppmになる。
Referring to Table 1, the sample of the present invention exhibits good formaldehyde scavenging properties, and reaches a level where almost no formaldehyde is detected when left for 3 hours. The formaldehyde dissociated even when heated to 50 ° C. was not detected at all, and it was confirmed that formaldehyde was reliably captured and not dissociated in the sample of the present invention.
Even in the comparative sample 1 in which the formaldehyde scavenger solution is not applied, formaldehyde is adsorbed due to the porosity of the fiberboard, but the adsorption amount is much smaller than that of the sample of the present invention, and the formaldehyde is physically adsorbed. However, it is easily released by heating.
In addition, Comparative Sample 2 in which the formaldehyde scavenger solution was applied to the fiberboard surface was inferior to the sample of the present invention applied to the back surface, and the amount of formaldehyde was 0 after 24 hours. Formaldehyde is dissociated by heating to formaldehyde concentration of 0.1 ppm.

本発明の繊維板はホルムアルデヒド捕捉能が大きいから、ホルムアルデヒドが含まれる室内に設置されると、該ホルムアルデヒドを効率良く捕捉し、例えば新築住宅で問題となるシックハウス症候群を確実に予防する。   Since the fiberboard of the present invention has a large formaldehyde-capturing ability, when it is installed in a room containing formaldehyde, it efficiently captures the formaldehyde and reliably prevents, for example, sick house syndrome, which is a problem in newly built houses.

Claims (3)

パルプを主体とするスラリーを抄造して抄造マットをフォーミングし、該抄造マットを加熱プレスして板状成形物とし、該板状成形物の裏面に加熱状態でホルムアルデヒド捕捉剤溶液をスプレーし、該ホルムアルデヒド捕捉剤溶液の溶媒を急速に蒸発せしめたことを特徴とするホルムアルデヒド捕捉性繊維板。   A paper-based slurry is formed to form a paper-forming mat, the paper-forming mat is heated and pressed to form a plate-shaped product, and a formaldehyde scavenger solution is sprayed in a heated state on the back surface of the plate-shaped material, A formaldehyde-trapping fiberboard characterized by rapidly evaporating a solvent of a formaldehyde-trapping agent solution. パルプを主体とするスラリーを抄造して抄造マットをフォーミングし、該抄造マットを加熱プレスして板状成形物とし、該板状成形物の裏面に加熱状態でホルムアルデヒド捕捉剤溶液をスプレーし、該ホルムアルデヒド捕捉剤溶液の溶媒を急速に蒸発せしめ、このようにしてホルムアルデヒド捕捉剤を裏面に付着含浸せしめた板状成形物を常温に冷却した後、該板状成形物の裏面に水打ちを行ないつゝ該板状成形物表面にホルムアルデヒド捕捉剤溶液を塗布し乾燥したことを特徴とするホルムアルデヒド捕捉性繊維板の製造方法。   A paper-based slurry is formed to form a paper-forming mat, the paper-forming mat is heated and pressed to form a plate-shaped product, and a formaldehyde scavenger solution is sprayed in a heated state on the back surface of the plate-shaped material, After rapidly evaporating the solvent of the formaldehyde scavenger solution and cooling the plate-shaped product impregnated and impregnated with the formaldehyde scavenger on the back surface to room temperature, watering the back surface of the plate-shaped product is performed. (2) A method for producing a formaldehyde-trapping fiberboard, wherein a formaldehyde-trapping agent solution is applied to the surface of the plate-shaped molded article and dried. 上記板状成形物の密度は0.8〜1.2g/cm3 である請求項1に記載のホルムアルデヒド捕捉性繊維板。 The formaldehyde-trapping fiberboard according to claim 1, wherein the density of the plate-shaped molded product is 0.8 to 1.2 g / cm 3 .
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US7989367B2 (en) 2006-06-30 2011-08-02 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions from fiberglass insulation
US8043383B2 (en) 2006-06-30 2011-10-25 Georgia-Pacific Chemicals Llc Reducing formaldehyde emissions
US8173219B2 (en) 2006-06-09 2012-05-08 Georgia-Pacific Chemicals Llc Porous fiberglass materials having reduced formaldehyde emissions
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JPS621501A (en) * 1985-06-27 1987-01-07 Noda Plywood Mfg Co Ltd Manufacture of fiber board
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US8173219B2 (en) 2006-06-09 2012-05-08 Georgia-Pacific Chemicals Llc Porous fiberglass materials having reduced formaldehyde emissions
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