JP2012111063A - Method of manufacturing wood fiberboard, and wood fiberboard - Google Patents
Method of manufacturing wood fiberboard, and wood fiberboard Download PDFInfo
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この発明は、インシュレーションボードやシージングボード等の軽量の木質繊維板の製造方法及び木質繊維板に関する。 The present invention relates to a method for manufacturing a lightweight wood fiber board such as an insulation board or a shizing board, and a wood fiber board.
例えば、断熱性、吸音性、調湿性に優れているため、畳床の芯材、屋根の断熱・防音層、床下地、天井・壁仕上げ材等に使用される比較的低密度のインシュレーションボードは、解繊した平均直径が１０〜２００μｍ程度の木質繊維と、バインダーとしての接着剤とを混合したスラリーを湿式抄造して湿潤マットを形成し、この湿潤マットを脱水、乾燥するこにとよって製造されるのが一般的である。 For example, because it has excellent heat insulation, sound absorption, and humidity control, it is a relatively low-density insulation board used for tatami flooring core materials, roof insulation / soundproofing layers, floor foundations, ceiling / wall finishing materials, etc. Is obtained by wet-making a slurry obtained by mixing a fibrillated wood fiber having an average diameter of about 10 to 200 μm and an adhesive as a binder to form a wet mat, and then dehydrating and drying the wet mat. It is common to be manufactured.
ところで、インシュレーションボード等の木質繊維板は、上述したように、低密度であるため、軽量で、断熱性、吸音性、調湿性等に優れているという特性を有しているが、逆に、十分な曲げ強度を確保することができず、強度が要求される箇所に使用することができないといった問題がある。 By the way, wood fiber boards such as insulation boards, as mentioned above, have low density, so they are lightweight and have excellent heat insulation, sound absorption, humidity control, etc. However, there is a problem that sufficient bending strength cannot be ensured and it cannot be used in places where strength is required.
こういった木質繊維板の強度アップを図る場合、スラリーへの接着剤の添加量を多くしたり、接着性能の高い接着剤を使用したりすることが考えられるが、木質繊維と接着剤とを含むスラリーを抄造して湿潤マットを形成する際や、形成した湿潤マットを脱水する際に、接着剤が水分と共に流出してしまうので、強度アップを図ることが難しいのが現状である。 In order to increase the strength of such wood fiber boards, it is possible to increase the amount of adhesive added to the slurry or use an adhesive with high adhesive performance. At the present time, it is difficult to increase the strength because the adhesive flows out together with moisture when forming the wet mat by forming the slurry containing the slurry or dehydrating the formed wet mat.
そこで、この発明の課題は、軽量・低密度を維持しつつ、しかも、強度アップを図ることができる木質繊維板の製造方法及び木質繊維板を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a wood fiber board manufacturing method and a wood fiber board capable of increasing strength while maintaining light weight and low density.
上記の課題を解決するため、請求項１に係る発明は、平均直径が１０〜２００μｍの木質繊維と、平均粒径が２５μｍ以下の木質微細粉または平均直径が０．５μｍ未満の木質微細繊維からなる木質微細化物とを含むスラリーを抄造することによって湿潤マットを形成し、この湿潤マットを脱水、乾燥するようにしたことを特徴とする木質繊維板の製造方法を提供するものである。 In order to solve the above-mentioned problems, the invention according to claim 1 includes a wood fiber having an average diameter of 10 to 200 μm and a wood fine powder having an average particle diameter of 25 μm or less or a wood fine fiber having an average diameter of less than 0.5 μm. The present invention provides a method for producing a wood fiberboard, characterized in that a wet mat is formed by making a slurry containing the resulting wood refinement and the wet mat is dehydrated and dried.
また、請求項２に係る発明は、請求項１に係る発明の木質繊維板の製造方法において、前記木質微細化物として前記木質微細繊維を使用し、前記スラリー中の前記木質繊維及び前記木質微細繊維の全重量に対する前記木質微細繊維の重量比率を、１０〜３０％に設定したことを特徴としている。 The invention according to claim 2 is the method for producing a wood fiber board according to claim 1, wherein the wood fine fiber is used as the wood refined product, and the wood fiber and the wood fine fiber in the slurry are used. The weight ratio of the wood fine fiber to the total weight of is set to 10 to 30%.
また、請求項３に係る発明は、請求項１に係る発明の木質繊維板の製造方法において、前記木質微細化物として前記木質微細粉を使用し、前記スラリー中の前記木質繊維及び前記木質微細粉の全重量に対する前記木質微細粉の重量比率を、２０〜４０％に設定したことを特徴としている。 The invention according to claim 3 is the method for producing a wood fiber board according to claim 1, wherein the wood fine powder is used as the wood refined product, and the wood fiber and the wood fine powder in the slurry are used. The weight ratio of the woody fine powder to the total weight of is set to 20 to 40%.
また、請求項４に係る発明は、請求項１、２または３に係る発明の木質繊維板の製造方法において、前記湿潤マットを脱水、乾燥した後に、樹脂含浸処理を施すことを特徴としている。 According to a fourth aspect of the present invention, in the method for producing a wood fiber board according to the first, second or third aspect of the present invention, the wet mat is dehydrated and dried, followed by a resin impregnation treatment.
また、請求項５に係る発明は、請求項４に係る発明の木質繊維板の製造方法において、含浸させる樹脂として、水系フェノール樹脂を使用したことを特徴としている。 The invention according to claim 5 is characterized in that, in the method for producing a wood fiber board according to claim 4, an aqueous phenol resin is used as the resin to be impregnated.
また、請求項６に係る発明は、請求項１、２、３、４または５に係る発明の製造方法によって製造された木質繊維板を提供するものである。 The invention according to claim 6 provides a wood fiber board manufactured by the manufacturing method of the invention according to claim 1, 2, 3, 4 or 5.
また、請求項７に係る発明は、平均直径が１０〜２００μｍの木質繊維を主原料として板状に成形された、密度が０．４ｇ／ｃｍ３以下の木質繊維板であって、平均粒径が２５μｍ以下の木質微細粉または平均直径が０．５μｍ未満の木質微細繊維からなる木質微細化物によって、主原料である前記木質繊維が結合されていることを特徴としている。 The invention according to claim 7 is a wood fiber board having a density of 0.4 g / cm 3 or less, which is formed into a plate shape using wood fibers having an average diameter of 10 to 200 μm as a main raw material, and has an average particle diameter Is characterized in that the wood fibers as the main raw material are bound together by a wood fine powder composed of wood fine powder of 25 μm or less or wood fine fibers having an average diameter of less than 0.5 μm.
また、請求項８に係る発明は、請求項７に係る発明の木質繊維板において、樹脂含浸処理が施されていることを特徴としている。 The invention according to claim 8 is characterized in that the wood fiber board of the invention according to claim 7 is subjected to resin impregnation treatment.
また、請求項９に係る発明は、請求項８に係る発明の木質繊維板において、含浸させる樹脂として、水系フェノール樹脂を使用したことを特徴としている。 The invention according to claim 9 is characterized in that, in the wood fiber board according to claim 8, an aqueous phenol resin is used as the resin to be impregnated.
以上のように、請求項１に係る発明の木質繊維板の製造方法では、スラリー中に、主原料である木質繊維以外に、木質微細粉または木質微細繊維からなる極めて表面積の大きい木質微細化物が含まれており、主原料である木質繊維のＯＨ基と、木質微細化物のＯＨ基とが極めて多くの箇所において水素結合で繋がることになるので、木質微細化物がバインダーとして機能し、製造された木質繊維板は、請求項７に記載の木質繊維板のように、木質微細繊維によって、主原料である前記木質繊維が結合された状態となり、木質繊維板全体の曲げ強度が向上する。 As described above, in the method for producing a wood fiber board according to the first aspect of the present invention, in the slurry, in addition to the wood fiber as the main raw material, a wood refined product having a very large surface area made of wood fine powder or wood fine fiber is contained. The OH group of the wood fiber, which is the main raw material, and the OH group of the wood refined product are connected by hydrogen bonding in a very large number of locations, so that the wood refined product functions as a binder and is manufactured. As in the wood fiber board according to claim 7, the wood fiber board is in a state in which the wood fibers as the main raw material are bonded by the wood fine fibers, and the bending strength of the whole wood fiber board is improved.
また、請求項２に係る発明の木質繊維板の製造方法では、木質微細化物として木質微細繊維を使用し、スラリー中の木質繊維及び木質微細繊維の全重量に対する木質微細繊維の重量比率を、１０〜３０％に設定しているので、木質繊維板の密度を０．４ｇ／ｃｍ３以下に抑えつつ、ＪＩＳ Ａ５９０５に規定するシージングボード（Ｓ−ＩＢ）と同等またはそれ以上の曲げ強度を確保することができる。即ち、主原料である木質繊維及び木質微細繊維の全重量に対する木質微細繊維の重量比率が１０％を下回ると、曲げ強度の向上について十分な効果を得ることができず、３０％を上回ると、密度が高くなってしまい、軽量ボードの範疇から外れてしまうからである。 Moreover, in the manufacturing method of the wood fiber board of the invention which concerns on Claim 2, a wood fine fiber is used as a wood refinement, The weight ratio of the wood fine fiber with respect to the total weight of the wood fiber in a slurry and a wood fine fiber is 10 Since it is set to -30%, the density of the wood fiber board is suppressed to 0.4 g / cm 3 or less, and the bending strength equal to or higher than that of the sizing board (S-IB) defined in JIS A5905 is secured. be able to. That is, if the weight ratio of the wood fine fiber to the total weight of the wood fiber and the wood fine fiber as the main raw material is less than 10%, it is not possible to obtain a sufficient effect for improving the bending strength, and if it exceeds 30%, This is because the density becomes high and falls outside the category of lightweight boards.
また、請求項３に係る発明の木質繊維板の製造方法では、木質微細化物として木質微細粉を使用し、スラリー中の木質繊維及び木質微細粉の全重量に対する木質微細粉の重量比率を、２０〜４０％に設定しているので、木質繊維板の密度を０．２ｇ／ｃｍ３以下に抑えつつ、Ａ級インシュレーションボード（Ａ−ＩＢ）と同等またはそれ以上の曲げ強度を確保することができる。即ち、主原料である木質繊維及び木質微細粉の全重量に対する木質微細粉の重量比率が２０％を下回ると、曲げ強度の向上について十分な効果を得ることができず、４０％を上回ると、密度が高くなってしまい、軽量ボードの範疇から外れてしまうからである。 Moreover, in the manufacturing method of the wood fiber board of the invention which concerns on Claim 3, wood fine powder is used as a wood refinement, The weight ratio of the wood fine powder with respect to the total weight of the wood fiber and wood fine powder in a slurry is 20 Since it is set to ˜40%, it is possible to secure a bending strength equal to or higher than that of the class A insulation board (A-IB) while suppressing the density of the wood fiber board to 0.2 g / cm 3 or less. it can. That is, when the weight ratio of the wood fine powder to the total weight of the wood fibers and the wood fine powder as the main raw material is less than 20%, it is not possible to obtain a sufficient effect for improving the bending strength, and if it exceeds 40%, This is because the density becomes high and falls outside the category of lightweight boards.
また、上述したように、木質微細繊維や木質微細粉等の木質微細化物を主原料である木質繊維のバインダーとして使用すると、２０℃吸水膨潤率が上昇するが、請求項４に係る発明の木質繊維板の製造方法のように、湿潤マットを脱水、乾燥した後に、樹脂含浸処理を施すようにしておくと、２０℃吸水膨潤率が上昇を抑えることができる。 In addition, as described above, when a wood refined product such as wood fine fiber or wood fine powder is used as a binder of wood fiber as a main raw material, the 20 ° C. water absorption swelling rate increases, but the wood of the invention according to claim 4 If the wet mat is dehydrated and dried as in the fiberboard manufacturing method and then subjected to resin impregnation treatment, an increase in the 20 ° C. water absorption swelling rate can be suppressed.
特に、請求項５に係る発明の木質繊維板の製造方法のように、含浸させる樹脂として、水系フェノール樹脂を使用すると、２０℃吸水膨潤率を１０％以下に抑えることができる。 In particular, when a water-based phenol resin is used as the resin to be impregnated as in the method for producing a wood fiber board according to claim 5, the 20 ° C. water absorption swelling rate can be suppressed to 10% or less.
以下、本発明の木質繊維板の製造方法及び木質繊維板について、表１を参照して説明するが、本発明の木質繊維板はこれらの実施例に限定されるものではない。 Hereinafter, although the manufacturing method and wood fiber board of this invention are demonstrated with reference to Table 1, the wood fiber board of this invention is not limited to these Examples.
（実施例１）
主原料である、解繊した太さ（平均直径）が１０〜２００μｍ程度の木質繊維を９０重量％と、木質微細化物として、太さ（平均直径）が０．１〜０．０１μｍのセルロースナノファイバー（セリッシュ、ダイセル化学（株）製）を１０重量％とを、水中で混合した原料濃度３％前後のスラリーを吸引濾過して湿潤マットを形成し、この湿潤マットを６０℃で予備乾燥した後、１０５℃で乾燥することによって木質繊維板を製造した。
Example 1
90% by weight of the main raw material, fibrillated thickness (average diameter) of about 10 to 200 μm, and cellulose nanofiber with a thickness (average diameter) of 0.1 to 0.01 μm as a refined wood A slurry with a raw material concentration of about 3% mixed with 10% by weight of fiber (Cerish, manufactured by Daicel Chemical Industries) in water was filtered by suction to form a wet mat, and this wet mat was pre-dried at 60 ° C. Then, the wood fiber board was manufactured by drying at 105 degreeC.
（実施例２）
主原料である木質繊維と木質微細化物であるセルロースナノファイバーとの混合比率が、木質繊維８０重量％、セルロースナノファイバー２０重量％である点を除いて、実施例１と同様の方法によって木質繊維板を製造した。
(Example 2)
Except that the mixing ratio of the wood fiber as the main raw material and the cellulose nanofiber as the wood refinement is 80% by weight of the wood fiber and 20% by weight of the cellulose nanofiber, the wood fiber is obtained by the same method as in Example 1. A board was produced.
（実施例３）
主原料である木質繊維と木質微細化物であるセルロースナノファイバーとの混合比率が、木質繊維７０重量％、セルロースナノファイバー３０重量％である点を除いて、実施例１と同様の方法によって木質繊維板を製造した。
(Example 3)
Except that the mixing ratio of the wood fiber as the main raw material and the cellulose nanofiber as the wood refinement is 70% by weight of the wood fiber and 30% by weight of the cellulose nanofiber, the wood fiber is obtained by the same method as in Example 1. A board was produced.
（実施例４）
樹脂固形分濃度が５％の水系イソシアネート樹脂水溶液を作成し、この樹脂水溶液に、実施例１の方法によって製造された木質繊維板を３〜５分間浸漬して、含浸率が２４％になるまで減圧含浸を行った後、６０℃で予備乾燥を行い、その後に、１０５℃で乾燥させると共に樹脂を硬化させた。なお、含浸率＝（含浸させた樹脂の重量）／（含浸前の木質繊維板の乾燥重量）である。
Example 4
An aqueous isocyanate resin aqueous solution having a resin solid content concentration of 5% is prepared, and the wood fiber board produced by the method of Example 1 is immersed in this resin aqueous solution for 3 to 5 minutes until the impregnation rate becomes 24%. After impregnation under reduced pressure, preliminary drying was performed at 60 ° C., followed by drying at 105 ° C. and curing of the resin. The impregnation ratio = (weight of impregnated resin) / (dry weight of the wood fiber board before impregnation).
（実施例５）
樹脂固形分濃度が５％の水系イソシアネート樹脂水溶液を作成し、この樹脂水溶液に、実施例２の方法によって製造された木質繊維板を３〜５分間浸漬して、含浸率が２１％になるまで減圧含浸を行った後、６０℃で予備乾燥を行い、その後に、１０５℃で乾燥させると共に樹脂を硬化させた。
(Example 5)
A water-based isocyanate resin aqueous solution having a resin solid content concentration of 5% is prepared, and the wood fiber board produced by the method of Example 2 is immersed in this resin aqueous solution for 3 to 5 minutes, until the impregnation rate becomes 21%. After impregnation under reduced pressure, preliminary drying was performed at 60 ° C., followed by drying at 105 ° C. and curing of the resin.
（実施例６）
樹脂固形分濃度が５％の水系イソシアネート樹脂水溶液を作成し、この樹脂水溶液に、実施例３の方法によって製造された木質繊維板を３〜５分間浸漬して、含浸率が１５％になるまで減圧含浸を行った後、６０℃で予備乾燥を行い、その後に、１０５℃で乾燥させると共に樹脂を硬化させた。
(Example 6)
An aqueous isocyanate resin aqueous solution with a resin solid content concentration of 5% is prepared, and the wood fiber board produced by the method of Example 3 is immersed in this resin aqueous solution for 3 to 5 minutes, until the impregnation rate becomes 15%. After impregnation under reduced pressure, preliminary drying was performed at 60 ° C., followed by drying at 105 ° C. and curing of the resin.
（実施例７）
水系イソシアネート樹脂水溶液の樹脂固形分濃度が１０％、含浸率が５５％である点を除いて、実施例４と同様の方法で樹脂含浸を行った。
(Example 7)
Resin impregnation was carried out in the same manner as in Example 4, except that the resin solid content concentration of the aqueous isocyanate resin aqueous solution was 10% and the impregnation rate was 55%.
（実施例８）
水系イソシアネート樹脂水溶液の樹脂固形分濃度が１０％、含浸率が４１％である点を除いて、実施例５と同様の方法で樹脂含浸を行った。
(Example 8)
Resin impregnation was performed in the same manner as in Example 5 except that the resin solid content concentration of the aqueous isocyanate resin aqueous solution was 10% and the impregnation rate was 41%.
（実施例９）
水系イソシアネート樹脂水溶液の樹脂固形分濃度が１０％、含浸率が３２％である点を除いて、実施例６と同様の方法で樹脂含浸を行った。
Example 9
Resin impregnation was carried out in the same manner as in Example 6 except that the solid content concentration of the aqueous isocyanate resin aqueous solution was 10% and the impregnation rate was 32%.
（実施例１０）
樹脂固形分濃度が５％のフェノール樹脂（分子量：２００）水溶液を作成し、この樹脂水溶液に、実施例１の方法によって製造された木質繊維板を３〜５分間浸漬することによって、含浸率が１８％になるまで樹脂を含浸させた後、６０℃で予備乾燥を行い、その後に、１５０℃で約３時間の加熱処理を行うことで、樹脂を硬化させた。
(Example 10)
An impregnation ratio is obtained by preparing a phenol resin (molecular weight: 200) aqueous solution having a resin solid concentration of 5%, and immersing the wood fiber board produced by the method of Example 1 in this resin aqueous solution for 3 to 5 minutes. The resin was impregnated to 18%, preliminarily dried at 60 ° C., and then heat-treated at 150 ° C. for about 3 hours to cure the resin.
（実施例１１）
フェノール樹脂の分子量が４００、含浸率が１３％である点を除いて、実施例１０と同様の方法で樹脂含浸を行った。
(Example 11)
Resin impregnation was performed in the same manner as in Example 10 except that the molecular weight of the phenol resin was 400 and the impregnation rate was 13%.
（実施例１２）
分子量が２００のフェノール樹脂と分子量が４００のフェノール樹脂とを１：１で混合したフェノール樹脂水溶液を作成した点及び含浸率が１８％である点を除いて、実施例１０と同様の方法で樹脂含浸を行った。
(Example 12)
Resin was produced in the same manner as in Example 10 except that a phenol resin aqueous solution in which a phenol resin having a molecular weight of 200 and a phenol resin having a molecular weight of 400 were mixed at a ratio of 1: 1 was prepared and the impregnation ratio was 18%. Impregnation was performed.
（実施例１３）
主原料である、解繊した太さ（平均直径）が１０〜２００μｍ程度の木質繊維を８０重量％と、木質微細化物として、サンダー粉を湿式磨砕処理機によって微細化した平均粒径１０〜２５μｍ（粒径分布範囲：２００〜０．４μｍ）の磨砕木粉を２０重量％とを、水中で混合した原料濃度３％前後のスラリーを吸引濾過して湿潤マットを形成し、この湿潤マットを６０℃で予備乾燥した後、１０５℃で乾燥することによって木質繊維板を製造した。
(Example 13)
80% by weight of wood fibers having a defibrated thickness (average diameter) of about 10 to 200 μm, which is the main raw material, and an average particle diameter of 10 to 10 by refining sander powder with a wet grinding processor A slurry having a raw material concentration of about 3% mixed with 20% by weight of ground wood powder of 25 μm (particle size distribution range: 200 to 0.4 μm) in water is suction filtered to form a wet mat. After preliminary drying at 60 ° C., the wood fiber board was produced by drying at 105 ° C.
（実施例１４）
主原料である木質繊維と木質微細化物である磨砕木粉との混合比率が、木質繊維６０重量％、磨砕木粉４０重量％である点を除いて、実施例１と同様の方法によって木質繊維板を製造した。
(Example 14)
Except that the mixing ratio of the wood fiber as the main raw material and the ground wood powder as the wood refined product is 60% by weight of the wood fiber and 40% by weight of the ground wood powder, the wood fiber is produced in the same manner as in Example 1. A board was produced.
（実施例１５）
イソシアネート樹脂をシンナーで１０％に希釈した樹脂溶液を作成し、この樹脂溶液に、実施例１３の方法によって製造された木質繊維板を数分浸漬して、含浸率が３５％になるまで含浸させた後、１０５℃で乾燥させると共に樹脂を硬化させた。
(Example 15)
A resin solution is prepared by diluting an isocyanate resin to 10% with thinner, and the wood fiber board produced by the method of Example 13 is immersed in this resin solution for several minutes, and impregnated until the impregnation rate becomes 35%. Thereafter, the resin was dried at 105 ° C. and cured.
（比較例１）
木質微細化物を混合することなく、太さ（平均直径）が１０〜２００μｍ程度の木質繊維のみを原料とした原料濃度３％前後のスラリーを吸引濾過して湿潤マットを形成した点を除いて、実施例１と同様の方法によって木質繊維板を製造した。
(Comparative Example 1)
Without mixing the wood refined material, except that the wet mat was formed by suction filtration of a slurry having a raw material concentration of about 3% using only wood fibers having a thickness (average diameter) of about 10 to 200 μm as a raw material, A wood fiberboard was produced in the same manner as in Example 1.
（比較例２）
イソシアネート樹脂をシンナーで１０％に希釈した樹脂溶液を作成し、この樹脂溶液に、比較例１の方法によって製造された木質繊維板を数分浸漬して、含浸率が３０％になるまで含浸させた後、１０５℃で乾燥させると共に樹脂を硬化させた。
(Comparative Example 2)
A resin solution is prepared by diluting an isocyanate resin to 10% with thinner, and the wood fiber board produced by the method of Comparative Example 1 is immersed in this resin solution for several minutes and impregnated until the impregnation rate becomes 30%. Thereafter, the resin was dried at 105 ° C. and cured.
（比較例３）
樹脂固形分濃度が５％のフェノール樹脂（分子量：２００）水溶液を作成し、この樹脂水溶液に、比較例１の方法によって製造された木質繊維板を３〜５分間浸漬することによって、含浸率が１９％になるまで樹脂を含浸させた後、６０℃で予備乾燥を行い、その後に、１５０℃で約３時間の加熱処理を行うことで、樹脂を硬化させた。
(Comparative Example 3)
An impregnation rate is obtained by preparing a phenol resin (molecular weight: 200) aqueous solution having a resin solid content concentration of 5%, and immersing the wood fiber board produced by the method of Comparative Example 1 in this resin aqueous solution for 3 to 5 minutes. After impregnating the resin to 19%, preliminary drying was performed at 60 ° C., followed by heat treatment at 150 ° C. for about 3 hours to cure the resin.
（比較例４）
フェノール樹脂の分子量が４００、含浸率が２１％である点を除いて、比較例３と同様の方法で樹脂含浸を行った。
(Comparative Example 4)
Resin impregnation was performed in the same manner as in Comparative Example 3 except that the molecular weight of the phenol resin was 400 and the impregnation rate was 21%.
（比較例５）
主原料である木質繊維と木質微細化物である磨砕木粉との混合比率が、木質繊維４０重量％、磨砕木粉６０重量％である点を除いて、実施例１と同様の方法によって木質繊維板を製造した。
(Comparative Example 5)
Except for the fact that the mixing ratio of the wood fiber as the main raw material and the ground wood powder as the wood refined product is 40% by weight of the wood fiber and 60% by weight of the ground wood powder, the wood fiber is produced in the same manner as in Example 1. A board was produced.
上述した実施例１〜１５及び比較例１〜５で得られたそれぞれの木質繊維板について、密度、曲げ強度、２０℃吸水膨潤率及び剥離強度を測定し、それぞれの結果を表２に示した。 About each wood fiber board obtained in Examples 1-15 and Comparative Examples 1-5 mentioned above, density, bending strength, 20 degreeC water absorption swelling rate, and peeling strength were measured, and each result was shown in Table 2. .
表２から分かるように、主原料である木質繊維に、木質微細化物であるセルロースナノファイバーを混合したスラリーを湿式抄造することによって製造された実施例１〜３の木質繊維板は、０．２〜０．３６ｇ／ｃｍ３と密度が小さいにも拘わらず、４．９Ｎ／ｍｍ２以上の曲げ強度を備えており、セルロースナノファイバーの混合量が大きくなるに従って、曲げ強度が大きくなっている。 As can be seen from Table 2, the wood fiberboards of Examples 1 to 3 manufactured by wet-making a slurry in which cellulose nanofibers which are wood refinements are mixed with wood fibers which are main raw materials are 0.2 Although it has a small density of ˜0.36 g / cm 3, it has a bending strength of 4.9 N / mm 2 or more, and the bending strength increases as the mixing amount of cellulose nanofibers increases.
また、表２から分かるように、主原料である木質繊維に、木質微細化物である磨砕木粉を混合したスラリーを湿式抄造することによって製造された実施例１３〜１５の木質繊維板は、木質微細化物としてセルロースナノファイバーを使用した実施例１〜３の木質繊維板に比べて曲げ強度が劣っているが、密度が０．１９〜０．２４ｇ／ｃｍ３と、ＪＩＳ Ａ５９０５に規定するたたみボード（Ｔ−ＩＢ）の上限密度（０．２７ｇ／ｃｍ３）を下回っているにもかかわらず、ＪＩＳ Ａ５９０５に規定するＡ級インシュレーションボード（Ａ−ＩＢ）と同等またはそれ以上の曲げ強度を有している。 Moreover, as can be seen from Table 2, the wood fiberboards of Examples 13 to 15 manufactured by wet papermaking a slurry in which ground fiber that is a refined wood material is mixed with wood fiber that is a main raw material are Bending strength is inferior to the wood fiberboards of Examples 1 to 3 using cellulose nanofibers as a refined product, but the density is 0.19 to 0.24 g / cm 3 , a folding board specified in JIS A5905 Despite being lower than the upper limit density (0.27 g / cm 3 ) of (T-IB), it has a bending strength equal to or higher than that of Class A insulation board (A-IB) specified in JIS A5905. is doing.
一方、表２から分かるように、木質微細化物を混合することなく、主原料である木質繊維のみを原料としたスラリーを湿式抄造することによって製造された比較例１の木質繊維板は、密度が０．１１ｇ／ｃｍ３とかなり小さく、それに伴って、曲げ強度も０．３Ｎ／ｍｍ３と極めて小さくなっており、ＪＩＳ Ａ５９０５に規定するたたみボード（Ｔ−ＩＢ）の曲げ強度の最小値（１．０Ｎ／ｍｍ３）を確保することができない。 On the other hand, as can be seen from Table 2, the wood fiberboard of Comparative Example 1 manufactured by wet-making a slurry using only the wood fiber as the main material as a raw material without mixing the wood refinement has a density of 0.11 g / cm 3 is quite small, and the bending strength is very small at 0.3 N / mm 3 accordingly, and the minimum bending strength (1) of the folding board (T-IB) defined in JIS A5905 0.0 N / mm 3 ) cannot be secured.
このように、主原料である木質繊維に、セルロースナノファイバーや磨砕木粉といった表面積が極めて大きい木質微細化物を混合すると、主原料である木質繊維のＯＨ基と、木質微細化物のＯＨ基とが極めて多くの箇所において水素結合で繋がることになるので、木質微細化物がバインダーとして機能し、製造された木質繊維板は、木質微細化物によって、主原料である木質繊維が結合された状態となり、木質繊維板全体の曲げ強度が向上するものと考えられる。 In this way, when wood refined products with a very large surface area such as cellulose nanofiber and ground wood flour are mixed with the wood fibers that are the main raw materials, the OH groups of the wood fibers that are the main materials and the OH groups of the wood refined products are mixed. Since it will be connected by hydrogen bonds in many places, the wood refined material will function as a binder, and the produced wood fiberboard will be in a state where the wood fibers that are the main raw materials are joined by the wood refined product, It is considered that the bending strength of the entire fiberboard is improved.
また、主原料である木質繊維に対する木質微細化物の混合量を大きくすると、木質繊維板の曲げ強度を大きくすることができるが、それに伴って、密度も大きくなるので、木質微細化物としてセルロースナノファイバーを使用する場合は、原料である木質繊維に対する混合比率を１０〜３０％の範囲内に設定しておくことが望ましく、木質微細化物として磨砕木粉を使用する場合は、原料である木質繊維に対する混合比率を２０〜４０％の範囲内に設定しておくことが望ましい。 In addition, if the amount of wood refined material mixed with wood fiber, the main raw material, is increased, the bending strength of the wood fiber board can be increased, but the density increases accordingly, so cellulose nanofiber as wood refined material. Is used, it is desirable to set the mixing ratio with respect to the wood fiber as the raw material within a range of 10 to 30%. It is desirable to set the mixing ratio within a range of 20 to 40%.
また、上述した木質微細化物は親水性が著しく強いので、主原料である木質繊維に木質微細化物を混合すると、２０℃吸水膨潤率が高くなる傾向にあるが、実施例４〜１２及び実施例１５の木質繊維板のように、樹脂含浸処理を施すことによって、膨潤率の上昇を抑えることができる。特に、樹脂固形分濃度が５％のフェノール樹脂を含浸させた実施例１０〜１２の木質繊維板については、膨潤率が大きく低下しているので、膨潤率の上昇を抑えるには、含浸させる樹脂としてフェノール樹脂を採用することが望ましい。 Moreover, since the above-mentioned wood refinement is extremely strong in hydrophilicity, mixing the wood refinement with the wood fiber as the main raw material tends to increase the 20 ° C. water absorption swelling rate, but Examples 4 to 12 and Examples As in the case of 15 wood fiberboard, the increase in the swelling rate can be suppressed by applying the resin impregnation treatment. In particular, for the wood fiber boards of Examples 10 to 12 impregnated with a phenol resin having a resin solid content concentration of 5%, the swelling ratio is greatly reduced. It is desirable to employ phenolic resin as
ただし、樹脂固形分濃度が５％の水系イソシアネート樹脂水溶液に木質繊維を浸漬した実施例４〜６の木質繊維板については、膨潤率がほとんど低下しなかったので、水系イソシアネート樹脂を含浸させる場合は、樹脂固形分濃度が１０％の水系イソシアネート樹脂水溶液に木質繊維を浸漬することが望ましい。 However, for the wood fiber boards of Examples 4 to 6 in which the wood fibers were immersed in an aqueous isocyanate resin aqueous solution having a resin solid content concentration of 5%, the swelling rate was hardly lowered, so when the aqueous isocyanate resin was impregnated It is desirable to immerse the wood fiber in an aqueous isocyanate resin aqueous solution having a resin solid content concentration of 10%.
また、樹脂を含浸させることによって、剥離強度を大きくすることができるという利点もあり、剥離強度を大きくするという観点からは、フェノール樹脂よりも水系イソシアネート樹脂を含浸させるほうが効果的である。 Moreover, there is an advantage that the peel strength can be increased by impregnating the resin. From the viewpoint of increasing the peel strength, it is more effective to impregnate the aqueous isocyanate resin than the phenol resin.
畳床、断熱材、壁材などのパネル心材として使用される軽量の木質繊維板の曲げ強度の向上を図る場合に利用することができる。 It can be used to improve the bending strength of lightweight wooden fiberboards used as panel cores such as tatami floors, heat insulating materials, and wall materials.
Claims (9)
前記スラリー中の前記木質繊維及び前記木質微細繊維の全重量に対する前記木質微細繊維の重量比率を、１０〜３０％に設定した請求項１に記載の木質繊維板の製造方法。 Using the wood fine fiber as the wood refinement,
The manufacturing method of the wood fiber board of Claim 1 which set the weight ratio of the said wood fine fiber with respect to the total weight of the said wood fiber and the said wood fine fiber in the said slurry to 10 to 30%.
前記スラリー中の前記木質繊維及び前記木質微細粉の全重量に対する前記木質微細粉の重量比率を、２０〜４０％に設定した請求項１に記載の木質繊維板の製造方法。 Using the wood fine powder as the wood refinement,
The manufacturing method of the wood fiber board of Claim 1 which set the weight ratio of the said wood fine powder with respect to the total weight of the said wood fiber and the said wood fine powder in the said slurry to 20 to 40%.
平均粒径が２５μｍ以下の木質微細粉または平均直径が０．５μｍ未満の木質微細繊維からなる木質微細化物によって、主原料である前記木質繊維が結合されていることを特徴とする木質繊維板。 A wood fiber board having a density of 0.4 g / cm 3 or less, which is formed into a plate shape from wood fibers having an average diameter of 10 to 200 μm,
A wood fiberboard characterized in that the wood fibers as the main raw material are bound together by woody fine powder having an average particle diameter of 25 μm or less or a wood refined product comprising wood fine fibers having an average diameter of less than 0.5 μm.
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