JPH10603A - Method for producing neutral wood board - Google Patents
Method for producing neutral wood boardInfo
- Publication number
- JPH10603A JPH10603A JP15694996A JP15694996A JPH10603A JP H10603 A JPH10603 A JP H10603A JP 15694996 A JP15694996 A JP 15694996A JP 15694996 A JP15694996 A JP 15694996A JP H10603 A JPH10603 A JP H10603A
- Authority
- JP
- Japan
- Prior art keywords
- board
- wood
- producing
- sodium sulfite
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Finished Plywoods (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
(57)【要約】
【課題】熱硬化性アミノ系接着剤を使用して合板、パー
ティクルボード等の木質系ボードを製造する方法におい
て、接着剤に起因する酸の生成によるボードの酸性化に
対して、簡単で有効な中和方法を開発する。
【解決手段】木質系ボード類の製造方法において、ボー
ド成形の加熱圧締直後の具体的には１０分以内におい
て、ボードの温度が７０〜１６０℃である時に亜硫酸ソ
ーダ水溶液をボード表面に散布添加し、ボード表面のｐ
Ｈを６〜８、ボードの含水率を７〜１１％に調整する。
【効果】簡単な工程を加えるだけで極めて効果的に木質
系ボードの中和を行うことができ、内層まで中和された
ボードが製造できる。本発明の方法により、長期の耐久
性に優れ、ホルムアルデヒドの放散も極めて少なく、建
築用部材としても優れた品質のボードが得られる。(57) Abstract: A method for producing a wood board such as plywood or particle board using a thermosetting amino-based adhesive, in which acidification of the board due to generation of an acid caused by the adhesive. To develop simple and effective neutralization methods. In a method for producing a wooden board, a sodium sulfite aqueous solution is sprinkled on the board surface when the temperature of the board is 70 to 160 ° C., specifically, within 10 minutes immediately after the heating and pressing of the board. And p on the board surface
Adjust H to 6-8, board moisture content to 7-11%. [Effect] The woody board can be neutralized very effectively only by adding a simple process, and a board neutralized to the inner layer can be manufactured. By the method of the present invention, a board having excellent long-term durability, extremely little formaldehyde emission, and excellent quality as a building member can be obtained.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、パーティクルボー
ド、合板、木質繊維板等の木質系ボードの耐久性を向上
させる処理方法に属する。更に詳しくは、木質系ボード
の表面及びまたは内部のｐＨを中性に調整する事によっ
て耐久性を向上させる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for improving the durability of a wood board such as a particle board, a plywood and a wood fiber board. More specifically, the durability is improved by adjusting the pH of the surface and / or the inside of the wooden board to neutral.
【０００２】[0002]
【従来の技術】木材の薄板，小片，繊維を接着してなる
パーティクルボード、合板、木質繊維板等は，木質系資
源の有効利用に役立っている。特に、パーティクルボー
ドは年間約１０００万立方メートルも生じる木質系建築
廃材をリサイクルして有効利用する手段として極めて有
用である。これら木質系ボードは、多くの場合ｐＨが弱
酸性または酸性であり、長期的な耐久性という観点から
は好ましくない。すなわち、長期間高温多湿にさらされ
た場合これら木質系ボード表面の変色や、甚だしい場合
には強度の劣化を引き起こす場合がある。2. Description of the Related Art Particleboard, plywood, wood fiberboard and the like obtained by bonding thin wood, small pieces, and fibers of wood are useful for effective use of wood resources. In particular, particle board is extremely useful as a means for recycling and effectively utilizing wood-based building waste generated by about 10 million cubic meters per year. In many cases, these wooden boards have a weakly acidic or acidic pH, which is not preferable from the viewpoint of long-term durability. That is, when exposed to high temperature and high humidity for a long period of time, the surface of these wooden boards may be discolored, or in extreme cases, the strength may be deteriorated.
【０００３】木質系ボードのｐＨが弱酸性または酸性で
ある原因は、木材チップ自身が弱酸性である事や、接着
剤として主に使用されている尿素樹脂、メラミン樹脂等
のアミノ系樹脂接着剤の硬化剤として塩化アンモニウム
や硫酸アルミニウムが用いられている事などが挙げられ
る。すなわち塩化アンモニウムや硫酸アルミニウムは、
接着剤中のホルムアルデヒドと反応し塩酸または硫酸を
生成する。アミノ系接着剤は木材工業分野において安価
で硬化が早く、貯蔵安定性も比較的良好であるので、か
かる問題点がありながらも広く使用されている。[0003] The cause of the pH of the wood-based board being weakly acidic or acidic is that the wood chip itself is weakly acidic, or an amino-based resin adhesive such as a urea resin or a melamine resin mainly used as an adhesive. For example, ammonium chloride or aluminum sulfate is used as a curing agent. That is, ammonium chloride and aluminum sulfate
Reacts with formaldehyde in adhesive to produce hydrochloric acid or sulfuric acid. Amino-based adhesives are inexpensive, cure quickly and have relatively good storage stability in the wood industry, and are widely used in spite of such problems.
【０００４】他方、アルカリフェノール樹脂接着剤を使
用して製造した木質系ボード類は、アルカリ性であり高
度な耐久性を有するが、硬化速度が遅いので製造に多大
なエネルギーと時間を必要とする問題点がある。さらに
アルカリフェノール樹脂は貯蔵安定性が悪く比較的短時
間で使用できなくなってしまう。On the other hand, wood-based boards manufactured using an alkali phenol resin adhesive are alkaline and have a high degree of durability, but require a large amount of energy and time for manufacturing due to a low curing speed. There is a point. Further, the alkali phenol resin has poor storage stability and cannot be used in a relatively short time.
【０００５】しかし、アミノ系樹脂接着剤を使用して製
造した木質系ボード類の中和の手段としては、チャンバ
ー中でアンモニアガスで中和する方法がＤＥ−ＯＳ２９
０３２５４に提案されているが多大な設備投資を必要と
し、且つ生産効率が悪い。[0005] However, as a means for neutralizing wood-based boards manufactured using an amino resin adhesive, a method of neutralizing with ammonia gas in a chamber is disclosed in DE-OS29.
No. 03254, requires a large capital investment and has poor production efficiency.
【０００６】またホルムアルデヒド臭の脱臭を目的とし
て、亜硫酸ソーダ水溶液とアンモニウム塩類をスプレー
風乾する方法が特願昭４５−１１７６９１に示されてい
るが、浸透性が不良なため添加効果が不十分で合板内部
のｐＨを高めることが出来ず、さらに風乾工程を必要と
する問題点がある。A method of spray-drying an aqueous sodium sulfite solution and ammonium salts for the purpose of deodorizing formaldehyde odor is disclosed in Japanese Patent Application No. 45-117691, but the effect of adding plywood is insufficient due to poor permeability. There is a problem that the internal pH cannot be increased and an air drying step is required.
【０００７】更に特願昭６１−２３９７６には界面活性
剤を含む亜硫酸ソーダ水溶液等を合板等に添加する方法
が示されている。しかし、界面活性剤を添加すると浸透
性は改善されるが、パーティクルボードの場合はボード
の吸水膨張率が増大するので好ましくない。また界面活
性剤を併用しても添加できる亜硫酸ソーダ水溶液量は少
量であり、製品のｐＨは低い。Further, Japanese Patent Application No. 61-23976 discloses a method of adding an aqueous solution of sodium sulfite containing a surfactant to plywood or the like. However, although the addition of a surfactant improves the permeability, it is not preferable in the case of a particle board because the board has an increased coefficient of water absorption and expansion. The amount of aqueous sodium sulfite solution that can be added even when a surfactant is used in combination is small, and the pH of the product is low.
【０００８】[0008]
【発明が解決しようとする課題】このように、従来の方
法に於いては木材の中和は不完全であったり、ボード類
の性能を損なう問題点が有り生産性も良くない。As described above, in the conventional method, there is a problem that the neutralization of wood is incomplete or the performance of boards is impaired, and the productivity is not good.
【０００９】[0009]
【課題を解決する為の手段】そこで本発明者らは、簡便
に木質系ボードを中性化する方法について鋭意研究を行
い、ボード表面に特定の条件下で亜硫酸ソーダを散布す
ることにより、極めて高い効果を得る方法を見出し本発
明を完成した。すなわち本発明の中性木質系ボードの製
造方法は、熱硬化性アミノ系接着剤を使用して木質系ボ
ードを製造する際に加熱圧締直後の木質系ボードの温度
が７０〜１６０℃である時に、濃度２〜１５％の亜硫酸
ソーダ水溶液を散布し、ボード表面のｐＨを６〜８と
し、且つボードの含水率を７〜１１％に調整することを
特徴とするものである。Means for Solving the Problems The present inventors have conducted intensive studies on a method for easily neutralizing a wooden board and spraying sodium sulfite on the board surface under a specific condition. The present inventors have found a method of obtaining a high effect and completed the present invention. That is, in the method for producing a neutral wood-based board of the present invention, when a wood-based board is manufactured using a thermosetting amino-based adhesive, the temperature of the wood-based board immediately after heating and pressing is 70 to 160 ° C. Occasionally, an aqueous solution of sodium sulfite having a concentration of 2 to 15% is sprayed to adjust the pH of the board surface to 6 to 8 and the water content of the board to 7 to 11%.
【００１０】[0010]
【発明の実施の形態】以下、本発明について具体的に説
明する。本発明の中性木質系ボードの製造方法は、木材
単板、木材小片、木材ファイバーをエレメントとし、主
としてアミノ系接着剤を使用し製造する際に表面に亜硫
酸ソーダ水溶液を散布浸透せしめ、必要に応じてボード
中心部に粉末亜硫酸ソーダを添加する方法である。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. The method for producing a neutral wood-based board of the present invention uses wood veneers, wood chips, and wood fibers as elements, and sprays and impregnates a sodium sulfite aqueous solution on the surface when producing using mainly an amino-based adhesive, which is necessary. In this method, powdered sodium sulfite is added to the center of the board.
【００１１】本発明の木質系ボードの製造に用いるアミ
ノ系接着剤とは、尿素樹脂、メラミン樹脂、尿素メラミ
ン樹脂、メラミンフェノール樹脂であり、硬化剤として
塩化アンモニウム及びまたは硫酸アンモニウムを使用す
るものであり。この組み合わせは硬化が速いので生産性
が向上する。The amino adhesive used in the production of the wood board of the present invention is a urea resin, a melamine resin, a urea melamine resin, a melamine phenol resin, and uses ammonium chloride and / or ammonium sulfate as a curing agent. . This combination improves productivity because of faster curing.
【００１２】亜硫酸ソーダ水溶液の散布は製板直後に行
われなければならない。亜硫酸ソーダ水溶液を散布する
際の木質系ボードの表面温度は７０〜１６０℃の範囲で
あることが必要であり、好ましくは１００から１３０℃
である。７０℃以下では亜硫酸ソーダ水溶液の浸透が不
十分であり、散布した亜硫酸ソーダ水溶液はボード表面
に液滴の状態で残ってしまう。１６０℃以上では亜硫酸
ソーダ水溶液が瞬時に蒸発し浸透が不十分になる。具体
的には加熱圧締後１０分以内に散布する事が望ましく、
更には７分以内が好ましい。１０分以内に散布すると亜
硫酸ソーダ水溶液は数秒で容易に内部へ浸透し、風乾等
の工程を経る事なくボードを積み上げたり、次の工程に
移る事ができる。１０分以上経過すると浸透性が低下
し、内部への浸透が不十分となる恐れがある。The application of the aqueous sodium sulfite solution must be performed immediately after the plate making. The surface temperature of the woody board when spraying the aqueous sodium sulfite solution needs to be in the range of 70 to 160 ° C, preferably 100 to 130 ° C.
It is. At 70 ° C. or lower, the permeation of the aqueous sodium sulfite solution is insufficient, and the sprayed aqueous sodium sulfite solution remains as droplets on the board surface. At 160 ° C. or higher, the aqueous sodium sulfite solution evaporates instantaneously, resulting in insufficient permeation. Specifically, it is desirable to spray within 10 minutes after heating and pressing,
Further, the time is preferably within 7 minutes. When sprayed within 10 minutes, the aqueous sodium sulfite solution easily penetrates into the inside in a few seconds, and the boards can be stacked or moved to the next step without going through a process such as air drying. After elapse of 10 minutes or more, the permeability may decrease, and the penetration into the inside may be insufficient.
【００１３】亜硫酸ソーダ水溶液を散布するとボード表
面に残存するホルムアルデヒドと反応しＮａＯＨを生
じ、ボード内の酸性成分を中和し、ｐＨを６〜８の中性
にすることができる。ボードのｐＨはボード表面を蒸留
水で濡らした後にｐＨ試験紙（ＭＲ−ＢＴＢ、ＢＴＢ
等）を浸すことで容易に測定できる。亜硫酸ソーダ水溶
液散布の方法は特に限定はないが、スプレー散布が望ま
しくその際のミストの直径は、０．００１〜０．１ｍｍ
が望ましい。亜硫酸ソーダ水溶液の濃度は２〜１５％が
望ましい。２％以下では、中和効果が不十分であり１５
％以上では結晶が析Ｊしスプレーノズルが詰まりやす
い。亜硫酸ソーダ水溶液の塗布量は片面５０〜４００ｇ
／ｍ2 が適量であり、更に好ましくは２００〜３００ｇ
／ｍ2 である。５０ｇ／ｍ2 以下では内部までの浸透量
が不十分であると同時に製品の含水率が低く、製品出荷
後ボードの「伸び」が問題になり易い。４００ｇ／ｍ2
以上では製品の含水率が高くなりすぎ、製品の出荷後、
乾燥による収縮や変形を起こすことがある。When a sodium sulfite aqueous solution is sprayed, it reacts with formaldehyde remaining on the board surface to generate NaOH, neutralizes acidic components in the board, and makes the pH 6 to 8 neutral. The pH of the board was measured using a pH test paper (MR-BTB, BTB) after wetting the board surface with distilled water.
) Can be easily measured. The method of spraying the aqueous sodium sulfite solution is not particularly limited, but spraying is desirable, and the diameter of the mist at that time is 0.001 to 0.1 mm.
Is desirable. The concentration of the aqueous sodium sulfite solution is preferably 2 to 15%. If it is 2% or less, the neutralizing effect is insufficient and 15%
%, The crystal is precipitated and the spray nozzle is easily clogged. The amount of the aqueous solution of sodium sulfite is 50-400 g per side.
/ M 2 is an appropriate amount, and more preferably 200 to 300 g.
/ M 2 . If it is less than 50 g / m 2 , the permeation amount to the inside is insufficient, and at the same time, the moisture content of the product is low. 400 g / m 2
With the above, the moisture content of the product becomes too high, and after shipping the product,
May cause shrinkage and deformation due to drying.
【００１４】木質系ボードに亜硫酸ソーダ水溶液を散布
する際にワックスエマルジョンを添加することで中和効
果を更に持続できる。木質系ボードに対するワックスエ
マルジョンの添加量は、１平方メートル当たり５０〜２
００ｇが良く、ワックスエマルジョンの固形分濃度は２
０〜５０％が望ましい。ワックスは、シリコンワックス
やパラフィンワックス等を選択できる。ワックスエマル
ジョンの添加は、亜硫酸ソーダ水溶液の添加と同時でも
構わないし、亜硫酸ソーダ水溶液の添加の直後でも構わ
ない。[0014] The neutralization effect can be further maintained by adding a wax emulsion when spraying the aqueous sodium sulfite solution on the wooden board. The amount of the wax emulsion added to the wood board is 50 to 2 per square meter.
00g is good, and the solid concentration of the wax emulsion is 2
0 to 50% is desirable. As the wax, silicon wax, paraffin wax or the like can be selected. The addition of the wax emulsion may be performed simultaneously with the addition of the aqueous sodium sulfite solution, or may be performed immediately after the addition of the aqueous sodium sulfite solution.
【００１５】このようにして得られた中和木質系ボード
は長期の耐久性に優れるが、ボードの厚みによっては十
分に中心部まで中和できない場合がありうる。そこで本
発明者らは、中心部まで中和する方法について、特に多
層パーティクルボードについて鋭意検討を重ねた。その
結果木質系ボードが多層パーティクルボードの場合、芯
層部に粉末の亜硫酸ソーダを添加し、ボードの中心部迄
中和効果を高めることが出来ることを見出した。粉末亜
硫酸ソーダの添加は接着剤の塗布前でも後でも構わない
が、接着剤に溶解させて添加することは出来ない。亜硫
酸ソーダの添加量は芯層チップに対して０．５〜３重量
％が適当である。３重量％を越えるとボード物性の物理
強度の低下をもたらし、０．５％未満では中和効果が不
十分である。芯層部に添加された亜硫酸ソーダはボード
製造の際の加熱の工程で中心部から外側へ浸透し、内側
からほぼボード全体が中和され更に耐久性が向上する。
但し、亜硫酸ソーダは中心層のアミノ系接着剤の硬化を
遅延する作用があるが、熱圧時間を５〜１０％程度延長
する事で容易に解決される。The neutralized wood-based board thus obtained is excellent in long-term durability, but may not be sufficiently neutralized to the center depending on the thickness of the board. Therefore, the present inventors have intensively studied a method of neutralizing the central part, particularly a multilayer particle board. As a result, it has been found that when the wood-based board is a multilayer particle board, powdered sodium sulfite is added to the core layer to enhance the neutralization effect up to the center of the board. The powdered sodium sulfite may be added before or after the application of the adhesive, but cannot be added after being dissolved in the adhesive. The appropriate amount of sodium sulfite to be added is 0.5 to 3% by weight based on the core layer chip. If it exceeds 3% by weight, the physical strength of the board decreases, and if it is less than 0.5%, the neutralizing effect is insufficient. The sodium sulfite added to the core layer penetrates from the center to the outside in the heating step in the manufacture of the board, almost neutralizes the entire board from the inside and further improves the durability.
However, although sodium sulfite has an effect of delaying the curing of the amino-based adhesive in the center layer, it can be easily solved by extending the heat pressure time by about 5 to 10%.
【００１６】また、本発明者らはボード中心層の硬化速
度向上について検討した結果、多層パーティクルボード
の中心層の接着剤がイソシアネート系接着剤の場合は、
亜硫酸ソーダを添加するとイソシアネート系接着剤の硬
化を促進するので、木質系ボード類の生産性を向上出来
ることも見出した。イシシアネート系接着剤とは分子中
に２個以上のイソシアネート基を有する化合物であり、
ヘキサメチレンジイソシアネート、ｍ−フェニレンジイ
ソシアネート、ｐ−フェニレンジイソシアネート、２，
４トリレンジイソシアネート、２，６トリレンジイソシ
アネート、ジフェニルメタン−４，４−ジイソシアネー
ト、ナフチレン−１，５−ジイソシアネート等を例示で
きる。またイソシアネート化合物を、予めポリオール等
でプレポリマー化して用いても構わない。The present inventors have studied the improvement of the curing speed of the center layer of the board. As a result, when the adhesive of the center layer of the multilayer particle board is an isocyanate-based adhesive,
It has also been found that the addition of sodium sulfite promotes the curing of the isocyanate-based adhesive, so that the productivity of wood-based boards can be improved. An isocyanate-based adhesive is a compound having two or more isocyanate groups in a molecule,
Hexamethylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,
Examples thereof include 4-tolylene diisocyanate, 2,6-tolylene diisocyanate, diphenylmethane-4,4-diisocyanate, and naphthylene-1,5-diisocyanate. Further, the isocyanate compound may be pre-polymerized with a polyol or the like before use.
【００１７】[0017]
【実施例】以下、実施例により本発明をさらに具体的に
説明する。The present invention will be described more specifically with reference to the following examples.
【００１８】実施例１〜７、比較例１〜４ 〔中性合板の作成〕 単板構成：０．９＋１．４＋０．９ｍｍラワンからなる
３層構成 単板含水率：７〜１０％ 接着剤塗布量：２８ｇ／９００ｃｍ2 堆積時間：２０分 冷圧時間：１５分（１２ｋｇ／ｃｍ2 ） 熱圧時間：６０秒、１０ｋｇ／ｃｍ2 熱圧温度：１２０℃ 接着剤：Ｕ−３２０（三井東圧化学株式会社製、尿素樹
脂） 接着剤配合条件 尿素樹脂 １００重量部 小麦粉 ２０重量部 塩化アンモニウム １．３重量部 上記条件を合板製作基本条件として、濃度１０％の亜硫
酸ソーダ水溶液の散布条件を変化させて中性合板を作成
した。表面を０．３ｍｍ研磨後、劣化処理としてウエザ
ーメーター１０００時間照射処理後ＪＡＳの温水浸せき
試験を行なった。強度単位はｋｇｆ／ｃｍ2 である。結
果は表１に示す。Examples 1 to 7, Comparative Examples 1 to 4 [Preparation of Neutral Plywood] Veneer: Three layers of 0.9 + 1.4 + 0.9 mm Rawan Veneer: 7 to 10% Adhesive application Amount: 28 g / 900 cm 2 Deposition time: 20 minutes Cold pressure time: 15 minutes (12 kg / cm 2 ) Heat pressure time: 60 seconds, 10 kg / cm 2 Heat pressure temperature: 120 ° C. Adhesive: U-320 (Mitsui Toatsu) Adhesive compounding conditions Urea resin 100 parts by weight Wheat flour 20 parts by weight Ammonium chloride 1.3 parts by weight The above conditions were used as basic conditions for plywood production, and the conditions for spraying a 10% aqueous sodium sulfite solution were changed. To make neutral plywood. After polishing the surface by 0.3 mm, irradiation treatment was performed for 1000 hours with a weather meter as a deterioration treatment, and a hot water immersion test of JAS was performed. The intensity unit is kgf / cm 2 . The results are shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】実施例８〜１５、比較例５〜８ 〔パーティクルボードの作成〕 ボード様式：３層ボード 使用チップ：（表層）ラワン、（芯層）ラワン チップ構成比： 表層：芯層＝１：２ 樹脂吹付け前チップ含水率：表層４％ 芯層２％ 樹脂吹付け後チップ含水率：表層１８％ 芯層８％ 樹脂吹付け率：表層１３％ 芯層７％ 設定ボード厚み：１２ｍｍ 又は ２０ｍｍ 設定ボード比重：０．７６ 熱圧温度：１８５℃ 熱圧時間：１４秒／ｍｍ 接着剤：Ｕ８１４（三井東圧化学株式会社製、メラミン
樹脂） 硬化剤：Ｕ８１４の１００部に対して塩化アンモニウム
１部を添加 上記条件をパーティクルボードの製作基本条件とし、厚
み１２ｍｍの中性パーティクルボードを製作した。製作
したボードは、ＪＩＳ Ａ５９０８に準じ湿潤曲げＢ試
験を行った。強度の単位はＮ／ｍｍ2 である。ボード表
面及び１ｍｍ研摩後のｐＨ及び劣化処理としてウエザー
メーターにて１０００時間処理を施した後の試験結果を
表２に示す。Examples 8 to 15 and Comparative Examples 5 to 8 [Preparation of Particle Board] Board style: 3-layer board Chip used: (surface layer) Rawan, (core layer) Rawan Chip composition ratio: surface layer: core layer = 1: 2 Chip moisture content before resin spraying: surface layer 4% core layer 2% Chip moisture content after resin spraying: surface layer 18% core layer 8% resin spraying rate: surface layer 13% core layer 7% Setting board thickness: 12 mm or 20 mm Setting board specific gravity: 0.76 Heat pressure temperature: 185 ° C. Heat pressure time: 14 seconds / mm Adhesive: U814 (Melamine resin, manufactured by Mitsui Toatsu Chemicals, Inc.) Curing agent: Ammonium chloride 1 per 100 parts of U814 The above conditions were used as basic conditions for producing a particle board, and a neutral particle board having a thickness of 12 mm was produced. The manufactured board was subjected to a wet bending B test according to JIS A5908. The unit of the intensity is N / mm 2 . Table 2 shows the test results after 1000 hours of treatment with a weather meter as a pH and deterioration treatment after polishing the board surface and 1 mm.
【００２１】[0021]
【表２】 [Table 2]
【００２２】実施例１６〜１７ 実施例８〜１５において作成したパーティクルボードの
厚みを２０ｍｍとし、接着剤をＵ７５５（三井東圧化学
株式会社製、尿素樹脂）に替えたものにワックスを表面
に添加した結果を表３に示す。ワックスは２０％パラフ
ィンワックスであり、亜硫酸ソーダ水溶液と同時にスプ
レー添加した。本発明のワックスを併用した中性パーテ
ィクルボードは、尿素樹脂を使用したにも関らずＪＩＳ
Ａ５９０８の湿潤時曲げ強度Ａ試験に合格した。Examples 16 to 17 The particle board prepared in Examples 8 to 15 was made to have a thickness of 20 mm, and the adhesive was changed to U755 (a urea resin manufactured by Mitsui Toatsu Chemical Co., Ltd.), and wax was added to the surface. Table 3 shows the results. The wax was a 20% paraffin wax, and was added simultaneously with the aqueous sodium sulfite solution by spraying. The neutral particle board using the wax of the present invention is JIS despite the use of urea resin.
A5908 passed the wet bending strength A test.
【００２３】[0023]
【表３】 [Table 3]
【００２４】実施例１８〜２１ 実施例８〜１５において作成したパーティクルボードの
厚みを２０ｍｍとし、芯層部接着剤をＵ８１４またはＵ
Ｒ４０００（三井東圧化学株式会社製、イソシアネート
系接着剤）とし、熱圧締後約５分の時点で表面温度１２
０℃において８％亜硫酸ソーダ水溶液を３５０ｇ／ｍ2
量散布した場合について、粉末亜硫酸ソーダを芯層部に
添加した結果を示す。ボードは全層にわたって中和され
た。ウエザーメーターにて１５００時間劣化処理を施し
た後の試験結果も含め表４にその結果を示す。Examples 18 to 21 The particle boards prepared in Examples 8 to 15 were made to have a thickness of 20 mm, and the core layer adhesive was made of U814 or U814.
R4000 (made by Mitsui Toatsu Chemical Co., Ltd., isocyanate-based adhesive).
At 0 ° C., 350 g / m 2 of an 8% aqueous sodium sulfite solution
The results of adding powdered sodium sulfite to the core layer in the case where the amount was sprayed are shown. The board was neutralized over all layers. Table 4 shows the results including the test results after 1500 hours of degradation treatment with a weather meter.
【００２５】[0025]
【表４】 [Table 4]
【００２６】実施例２２〜２５、 実施例８〜１５において作成したパーティクルボードの
厚みを２０ｍｍとしたものについて、亜硫酸ソーダ添加
によるホルマリン抑制効果を表５に製造１週間後と１ケ
月後の放出ホルムアルデヒド量により示す。この表５が
示すように、本発明のパーティクルボードは放出ホルム
アルデヒドが極めて少ない。For the particleboards prepared in Examples 22 to 25 and Examples 8 to 15 having a thickness of 20 mm, Table 5 shows the formalin-suppressing effect of the addition of sodium sulfite. Indicated by volume. As shown in Table 5, the particle board of the present invention emits very little formaldehyde.
【００２７】[0027]
【表５】 [Table 5]
【００２８】[0028]
【発明の効果】本発明の方法によれば、木質系ボードの
製造工程に簡単な工程を加えるだけで、生産効率を高く
保ちながら木質系ボードの中和を極めて効果的に行うこ
とが出来る。従って、ボードの耐久性を向上させること
が出来、またボードが中性であるので二次的な加工をす
る際にも悪影響を与えない。更にボードから放出される
ホルムアルデヒドも極めて低くすることが出来る。また
含水率が高いので寸法安定性にも優れ、建築用部材とし
て好適に用いられるものが得られる。According to the method of the present invention, it is possible to extremely effectively neutralize the wood-based board while keeping the production efficiency high by adding a simple process to the wood-based board manufacturing process. Therefore, the durability of the board can be improved, and since the board is neutral, there is no adverse effect on secondary processing. Furthermore, formaldehyde released from the board can be extremely low. In addition, since the water content is high, the dimensional stability is excellent, and a material suitable for use as a building member is obtained.
フロントページの続き (72)発明者 松永 幸治 大阪府高石市高砂１丁目６番地 三井東圧 化学株式会社内Continued on the front page (72) Inventor Koji Matsunaga 1-6-6 Takasago, Takaishi-shi, Osaka Mitsui Toatsu Chemicals Co., Ltd.
Claims (6)
ボードを製造する際に加熱圧締直後の木質系ボードの温
度が７０〜１６０℃である時に、濃度２〜１５％の亜硫
酸ソーダ水溶液を散布し、ボード表面のｐＨを６〜８と
し、且つボードの含水率を７〜１１％に調整することを
特徴とする中性木質系ボードの製造方法。1. A method for producing a wood board using a thermosetting amino-based adhesive, wherein the temperature of the wood board immediately after heating and pressing is 70 to 160 ° C., and a sulfurous acid having a concentration of 2 to 15%. A method for producing a neutral wood board, comprising spraying an aqueous soda solution to adjust the pH of the board surface to 6 to 8 and adjusting the water content of the board to 7 to 11%.
の中性木質系ボードの製造方法。2. The method for producing a neutral wood board according to claim 1, wherein the wood board is plywood.
る請求項１記載の中性木質系ボードの製造方法。3. The method for producing a neutral wood board according to claim 1, wherein the wood board is a particle board.
であって芯層部に接着剤として、イソシアネート系接着
剤を使用している請求項１記載の中性木質系ボードの製
造方法。4. The method for producing a neutral wood-based board according to claim 1, wherein the wood-based board is a multilayer particle board, and an isocyanate-based adhesive is used as an adhesive for the core layer.
ジョンを散布する請求項１記載の中性木質系ボードの製
造方法。5. The method for producing a neutral wood board according to claim 1, wherein the wax emulsion is sprayed together with the aqueous sodium sulfite solution.
亜硫酸ソーダを芯層チップに対して０．２〜３％添加す
る請求項４記載の中性木質系ボードの製造方法。6. The method for producing a neutral woody board according to claim 4, wherein the powdered sodium sulfite is added to the core layer of the multilayer particle board in an amount of 0.2 to 3% based on the core layer chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15694996A JP3701079B2 (en) | 1996-06-18 | 1996-06-18 | Manufacturing method of neutral wood board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15694996A JP3701079B2 (en) | 1996-06-18 | 1996-06-18 | Manufacturing method of neutral wood board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10603A true JPH10603A (en) | 1998-01-06 |
| JP3701079B2 JP3701079B2 (en) | 2005-09-28 |
Family
ID=15638865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15694996A Expired - Lifetime JP3701079B2 (en) | 1996-06-18 | 1996-06-18 | Manufacturing method of neutral wood board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3701079B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4780725A (en) * | 1986-02-18 | 1988-10-25 | Thomson-Csf | Rotary curtain antenna |
| JP2007301804A (en) * | 2006-05-10 | 2007-11-22 | Ipposha Oil Ind Co Ltd | Aldehyde-collecting agent and its manufacturing method |
| JP2011506122A (en) * | 2007-08-10 | 2011-03-03 | クロノテック・アーゲー | Method for reducing the release of aldehydes and volatile organic compounds from woody materials |
| CN103950085A (en) * | 2013-08-05 | 2014-07-30 | 西南林业大学 | Method for establishing moisture content gradient of shaving board |
| CN104493948A (en) * | 2014-11-26 | 2015-04-08 | 南京林业大学 | Preparation method for shaving board with high moisture content |
| WO2024104889A1 (en) * | 2022-11-15 | 2024-05-23 | Flooring Technologies Ltd. | Method of recycling melamine-formaldehyde resin from wastes that occur during production and processing of woodbase material boards |
| EP4495173A1 (en) * | 2023-07-20 | 2025-01-22 | Flooring Technologies Ltd. | Process for recycling melamine-formaldehyde resin from waste resulting from the production and processing of wooden boards |
-
1996
- 1996-06-18 JP JP15694996A patent/JP3701079B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4780725A (en) * | 1986-02-18 | 1988-10-25 | Thomson-Csf | Rotary curtain antenna |
| JP2007301804A (en) * | 2006-05-10 | 2007-11-22 | Ipposha Oil Ind Co Ltd | Aldehyde-collecting agent and its manufacturing method |
| JP2011506122A (en) * | 2007-08-10 | 2011-03-03 | クロノテック・アーゲー | Method for reducing the release of aldehydes and volatile organic compounds from woody materials |
| US9012539B2 (en) | 2007-08-10 | 2015-04-21 | Kronotec Ag | Method for reducing the emission of aldehydes and volatile organic compounds of wood materials |
| CN103950085A (en) * | 2013-08-05 | 2014-07-30 | 西南林业大学 | Method for establishing moisture content gradient of shaving board |
| CN104493948A (en) * | 2014-11-26 | 2015-04-08 | 南京林业大学 | Preparation method for shaving board with high moisture content |
| WO2024104889A1 (en) * | 2022-11-15 | 2024-05-23 | Flooring Technologies Ltd. | Method of recycling melamine-formaldehyde resin from wastes that occur during production and processing of woodbase material boards |
| EP4495173A1 (en) * | 2023-07-20 | 2025-01-22 | Flooring Technologies Ltd. | Process for recycling melamine-formaldehyde resin from waste resulting from the production and processing of wooden boards |
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| Publication number | Publication date |
|---|---|
| JP3701079B2 (en) | 2005-09-28 |
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