JP3553660B2 - Manufacturing method of modified wood - Google Patents
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- JP3553660B2 JP3553660B2 JP24720394A JP24720394A JP3553660B2 JP 3553660 B2 JP3553660 B2 JP 3553660B2 JP 24720394 A JP24720394 A JP 24720394A JP 24720394 A JP24720394 A JP 24720394A JP 3553660 B2 JP3553660 B2 JP 3553660B2
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Description
【０００１】
【産業上の利用分野】
本発明は木材あるいは木質系材料の寸法安定化、耐久化、及び外観の向上化に関する。
【０００２】
【従来の技術】
従来より木材にメタクリル酸エステル、スチレン等のビニル系モノマ−及びプレポリマ−並びに不飽和ポリエステル類を含浸し木材中で重合、硬化させて得られる木材プラスチック複合体はＷＰＣと称せられ、寸法安定性や強度、耐久性、耐摩耗性を向上させた材料として、その性能が広く認識されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、これらのＷＰＣは十分な寸法安定性を付与するためには木材へ十分な注入を行なわなければならないため、処理剤のコストがかかるばかりか、含浸率の増加にともない木材の素材感が失われやすいという欠点があった。
【０００４】
また、かかる問題点を解決するために、低含浸率、低コストで環状エステル化合物と木材の複合化等も試みられており、優れた寸法安定性が得られている。しかしながら環状エステル化合物単独では、木材が十分膨潤するものの軟質化して表面硬度が低下し傷が発生しやすく強度的な改善効果はあまりなかった。
【０００５】
【課題を解決するための手段】本発明は上記の問題を解決するために検討されたもので、請求項１に記載の発明は、アクリル系化合物と環状エステル系化合物を混合した薬液を木材あるいは木質系材料に含浸し、硬化させる改質木材の製法において、上記環状エステル系化合物は、環状構造中に窒素を含まない構造であることを特徴とする改質木材の製法である。また、請求項２に記載の発明は、請求項１に記載の改質木材の製法において、前記環状エステル系化合物は、β−プロピオラクトン、δ−バレロラクトン、ε−カプロラクトン、クマリン、テトリン酸、フタリド、及び、これらの誘導体の中から１種又は２種以上選択された化合物であることを特徴とする改質木材の製法である。請求項３の発明は、前記アクリル系化合物と、前記環状エステル系化合物を１：５〜５：１の割合で混合した薬液を、不揮発分で１０〜３０％の含浸率で木材あるいは木質系材料に含浸し、硬化させることを特徴とする請求項１または２に記載の改質木材の製法である。請求項４の発明は、前記アクリル系化合物をメチルメタクリレートとし、前記環状エステル系化合物をε−カプロラクトンとしたことを特徴とする請求項３に記載の改質木材の製法である。本発明は、上記により木材の特性を損なわずに外観を向上させ、寸法安定性、強度に優れた改質木材の製法を提供するものである。以下、本発明について説明する。
【０００６】
本発明に用いるアクリル系化合物としてはアクリル酸、メタクリル酸、アクリル酸エステル、メタクリル酸エステル、不飽和ポリエステル、スチレン、スチレン誘導体の中から１種又は２種以上を選択し、重合開始剤、例えば過硫酸化物、過酸化水素、過酸化物、アゾ系重合開始剤、酸化還元型のレドックス重合開始剤等、更に必要に応じてアミン、金属セッケン等の重合促進剤を添加したものが適用できる。
【０００７】
アクリル酸エステルについてはアルキルアクリレ−ト、ヒドロキシアルキルアクリレ−ト、ジエチレングリコ−ルアクリレ−ト、ポリエチレングリコ−ルアクリレ−ト、グリシジルアクリレ−ト、エチレングリコ−ルジアクリレ−ト、エトキシアルキルアクリレ−ト等が例示され、また、メタクリル酸エステルについてはアルキルメタクリレ−ト、ヒドロキシアルキルメタクリレ−ト、グリシジルメタクリレ−ト、エチレングリコ−ルメタクリレ−ト、エチレングリコ−ルジメタクリレ−ト、ポリエチレングリコ−ルメタクリレ−ト、ポリエチレングリコ−ルジメタクリレ−トアルキル：エチル、メチル、ペンチル等）が例示される。スチレン誘導体としてはα−メチルスチレン、ｐ−メチル−α−メチルスチレン等が例示される。好適には浸透性がよく重合しやすいメチルメタクリレ−トを用いるのが望ましい。
【０００８】
環状エステル系化合物としては、β−プロピオラクトン、δ−バレロラクトン、ε−カプロラクトン、クマリン、テトリン酸、フタリド等の化合物や、これらの誘導体の中から一種又は２種以上を選択し、反応を迅速かつ効率よく進めるために、必要に応じてアルカリ金属、アルカリ金属の水素化物、水酸化物、炭酸塩、アルキル金属脂肪族アミン、酸、金属ハロゲン化物を添加したものが適用できる。好適にはコスト的に有利で反応性に富むε−カプロラクトンを用いるのが望ましい。
【０００９】
アクリル系化合物と環状エステル系化合物は重量比で１：９９〜９９：１の割合で混合するのが望ましく、環状エステル系化合物が多く１：９９を超える場合は強度不足となりやすく、アクリル系化合物が多く９９：１を超える場合は環境の変化に追従しづらくなり寸法変化が大きくなり割れを生じやすいものとなる。抗湿能、曲げ強さ、外観性（特に透明感、肌触り）に優れるのは１：５〜５：１の範囲である。
【００１０】
薬液は木材への付着量をコントロールするために各処理液に相溶性のある種々の溶媒を添加して希釈して用いることが可能で、この場合、溶媒としては薬液との反応性が低いほど好ましく、具体例として、ヘキサン、ヘプタンなどの脂肪族炭化水素、トルエン、キシレンなどの芳香族炭化水素、ジエチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、ジオキサンなどのエーテル類、酢酸エチル、酢酸ブチルなどのエステル類、アセトン、メチルエチルケトンなどのケトン類、さらには水やアルコール類などが挙げられるが、特にこれらに限定するものではない。
【００１１】
薬液は木材の組織内部まで浸透させるという観点から注入法を用いるのが望ましく、例えば、浸漬法、減圧注入、加圧注入、あるいはこれらの注入法を組み合わた方法などが適用できる。薬液の含浸率は木材の素材感を損うことなく寸法安定性、強度を向上させるため不揮発分で１０〜３０％とするのが望ましい。ここで含浸率は薬液の付着量を元の木材の重量で除し１００を乗じたもので式１で表される。
【００１２】
【式１】
Ｗ＝［（Ｗ２−Ｗ１）／Ｗ１］×１００（％）
Ｗ ：含浸率
Ｗ２：含浸、乾燥後の木材の重量
Ｗ１：元の木材の重量
【００１３】
上記の薬液で処理した木材は、熱風加熱、赤外線加熱、遠赤外線加熱等の加熱処理や、放射線、紫外線等で硬化させることが可能であり、加熱温度や加熱時間等はアクリル系化合物や環状エステル系化合物が充分に硬化し、木材が損傷しない程度であればよく、加熱処理の条件は薬液の組成、硬化剤によって多少異なるが、概ね、８０〜１４０℃、０．１〜８時間とするのが望ましい。さらに、平板プレスや連続プレスなどを用いて加熱と同時に加圧しても差し支えなく、この場合は、硬化が促進され強度的にも優れたものとなる。加圧する際の圧力の条件としても、硬化を促進し、木材が損傷しない程度とするのが望ましく、５〜２０ｋｇｆ／ｃｍ２の条件が適する。
【００１４】
本発明に適用できる木材や木質系材料としては、製材品、スライス単板、集成材、パ−ティクルボ−ドなどが挙げられ、具体的には、アカガシ、カバ、ブナ、ラワン、ポプラ、カポ−ル、ナラ、ケヤキ、エノキなどの広葉樹材、スギ、マツ、カラマツ、ヒノキなどの針葉樹材、ゴムノキ集成材、ＬＶＬ（Ｌａｍｉｎａｔｅｄ Ｖｅｎｅｅｒ Ｌｕｍｂｅｒ）等、また、形状的には板状、柱状など例示しうるが、これらに限定するものものではない。
【００１５】
【作用】
木材にアクリル系化合物と環状エステル系化合物を主成分とする薬液を含浸し、硬化させる事によって通常の低含浸ＷＰＣの欠点を補い、木材との親和性の良い環状エステル化合物によって寸法変化を効果的に抑え、アクリル系化合物の重合に伴う木材中での収縮を緩和し、割れにくいものとなる。
【００１６】
以下、実施例、比較例を示し詳細に説明する。
【実施例】
実施例１
アクリル系化合物としてメチルメタクリレ−ト（シロップ状）２５０ｇ、重合開始剤として過酸化ベンゾイル２．５ｇ、環状エステル化合物としてε−カプロラクトン２５０ｇ、溶媒としてトルエン５００ｇを混合して薬液（Ａ）を得た。次いで厚さ５ｍｍ、気乾比重０．３７〜０．４２、繊維方向長さ３００ｍｍ、接線方向１００ｍｍのスギに薬液（Ａ）を減圧加圧法により含浸率が不揮発分で２０％となるように含浸し、１２０℃の熱風乾燥器中で３時間加熱し、実施例１の改質木材を得た。
【００１７】
実施例２
アクリル系化合物としてポリエチレングリコ−ルモノメタクリレ−ト３００ｇと２−ヒドロキシエチルメタクリレ−ト３００ｇ、重合開始剤として過酸化ベンゾイル６．０ｇと、環状エステル化合物としてε−カプロラクトン２００ｇ、触媒として塩酸２．０ｇ、溶媒として蒸留水２００ｇとを混合して薬液（Ｂ）を得た。次いで実施例１と同様のスギに減圧法により薬液（Ｂ）を含浸率が不揮発分で２０％となるように含浸し、１２０℃の熱風乾燥器中で３時間加熱し、実施例２の改質木材を得た。
【００１８】
実施例３
アクリル系化合物としてグリシジルメタクリレ−ト３００ｇとスチレン３００ｇ、重合開始剤としてメチルエチルケトンパ−オキサイド６．０ｇ、触媒としてオクテン酸コバルト６．０ｇ、環状エステル化合物としてε−カプロラクトン２００ｇとを混合し薬液（Ｃ）を得た。次いで実施例１と同様のスギに減圧加圧法により薬液（Ｃ）を含浸率が不揮発分で２０％となるように含浸し、風乾後ホットプレスを用いて６０℃、圧力５ｋｇｆ／ｃｍ２で３０分加熱圧締し、実施例３の改質木材を得た。
【００１９】
実施例４
アクリル系化合物としてメチルメタクリレ−ト（シロップ状）２５０ｇ、重合開始剤として過酸化ベンゾイル２．５ｇと、環状エステル化合物としてδ−バレロラクトン２５０ｇ、溶媒としてトルエン５００ｇとを混合し薬液（Ｄ）を得た。次いで実施例１と同様のスギに減圧加圧法により薬液（Ｄ）を含浸率が不揮発分で２０％となるように含浸し、１２０℃の熱風乾燥器中で３時間加熱し、実施例４の改質木材を得た。
【００２０】
比較例１
環状エステル化合物を用いることなく、アクリル系化合物としてメチルメタクリレ−ト（シロップ状）５００ｇとスチレン５００ｇ、重合開始剤として過酸化ベンゾイル２．０ｇとを混合して処理剤（ａ）を得た。次いで実施例１と同様のスギに減圧加圧法により処理剤（ａ）を含浸率が不揮発分で２０％となるように含浸し、１２０℃の熱風乾燥器中で３時間加熱し、比較例１の処理木材を得た。
【００２１】
比較例２
環状エステル化合物を用いることなく、アクリル系化合物としてメチルメタクリレ−ト（シロップ状）３００ｇと不飽和ポリエステル５００ｇとスチレン２００ｇ、重合開始剤として過酸化ベンゾイル６．０ｇ、触媒としてオクチル酸コバルト６．０ｇを混合し処理剤（ｂ）を得た。次いで実施例１と同様のスギに減圧加圧法により処理剤（ｂ）を含浸率が不揮発分で２０％となるように含浸し、風乾後ホットプレスを用いて６０℃、圧力５ｋｇｆ／ｃｍ２で３０分加熱圧締し、比較例２の処理木材を得た。
【００２２】
比較例３
環状エステル化合物を用いることなく、アクリル系化合物としてポリエチレングリコ−ルモノメタクリレ−ト４００ｇと２−ヒドロキシエチルメタクリレ−ト６００ｇ、重合開始剤としてメチルエチルケトンパ−オキサイド１０ｇを混合して処理剤（ｃ）を得た。次いで実施例１と同様のスギに減圧加圧法により処理剤（ｃ）を含浸率が不揮発分で２０％となるように含浸し、１２０℃の熱風乾燥器中で３時間加熱し、比較例３の処理木材を得た。
【００２３】
比較例４
アクリル系化合物を用いることなく、環状エステル化合物としてε−カプロラクトン３００ｇ、触媒として塩酸６ｇ、溶媒として水７００ｇとを混合し、処理剤（ｄ）を得た後、実施例１と同様のスギに減圧加圧法により処理剤（ｄ）を含浸率が不揮発分で２０％となるように含浸した。次いで１２０℃の熱風乾燥器中で３時間加熱し、比較例４の処理木材を得た。
【００２４】
実施例１〜実施例４の改質木材、及び比較例１〜比較例４の処理木材について寸法安定性、吸湿性、曲げ強さ、割れについて評価した。寸法安定性、吸湿性については試験体を４０℃−３０％ＲＨ、４０℃−９０％ＲＨの恒温恒湿槽に平衡になるまで静置し、抗膨潤能（ＡＳＥ）、抗吸湿性（ＭＥＥ）を測定した。曲げ強さについてＪＩＳＺ２１１３に基づき試験を行った。割れについてはＪＡＳ寒熱繰返しＡ試験に基づき、８０℃の恒温器中に２時間放置した後、−２０℃の恒温器中に２時間放置する工程を５サイクル繰返し、室温に達するまで放置し外観を確認し、割れなきを〇、割れありを×とした。評価結果を表１に示す。
【００２５】
【表１】
【発明の効果】
アクリル系化合物と環状エステル系化合物を主成分とする薬液を木材に注入し、硬化させて得られる改質木材は、従来のＷＰＣに比べ含浸率が低いにもかかわらず割れにくく、寸法安定性、強度物性に優れたものとなる。
【００２７】
更に薬液の含浸率が１０〜３０％と低いために木質の肌触りや外観が向上したものとなる。[0001]
[Industrial applications]
The present invention relates to dimensional stabilization, durability, and appearance improvement of wood or wood-based materials.
[0002]
[Prior art]
Conventionally, wood-plastic composites obtained by impregnating wood with vinyl-based monomers and prepolymers such as methacrylates and styrene, and unsaturated polyesters, and polymerizing and curing the wood are called WPCs. As a material with improved strength, durability and abrasion resistance, its performance is widely recognized.
[0003]
[Problems to be solved by the invention]
However, since these WPCs must be sufficiently injected into wood to provide sufficient dimensional stability, not only is the cost of the treatment agent high, but also the wood texture is lost as the impregnation rate increases. There was a drawback that it was easily damaged.
[0004]
Further, in order to solve such problems, attempts have been made to combine a cyclic ester compound with wood at a low impregnation rate and at low cost, and excellent dimensional stability has been obtained. However, when the cyclic ester compound alone is used, although the wood swells sufficiently, it softens and the surface hardness is reduced, so that scratches are likely to occur and there is not much effect of improving the strength.
[0005]
DISCLOSURE OF THE INVENTION The present invention has been studied in order to solve the above-mentioned problems, and the present invention according to claim 1 is directed to a method of mixing a chemical solution obtained by mixing an acrylic compound and a cyclic ester compound with wood or wood. A method for producing modified wood in which a wood-based material is impregnated and hardened, wherein the cyclic ester-based compound has a structure that does not contain nitrogen in a cyclic structure. Further, according to a second aspect of the present invention, in the method for producing a modified wood according to the first aspect, the cyclic ester compound is β-propiolactone, δ-valerolactone, ε-caprolactone, coumarin, tetolinic acid. , Phthalide, and one or more compounds selected from these derivatives. The invention according to claim 3 is a wood or wood-based material obtained by mixing the acrylic compound and the cyclic ester compound in a ratio of 1: 5 to 5: 1 with a non-volatile content of 10 to 30%. The method for producing modified wood according to claim 1, wherein the modified wood is impregnated and cured. The invention according to claim 4 is the method for producing modified wood according to claim 3, wherein the acrylic compound is methyl methacrylate, and the cyclic ester compound is ε-caprolactone. An object of the present invention is to provide a method for producing a modified wood which is improved in appearance as described above without impairing the properties of the wood, and has excellent dimensional stability and strength. Hereinafter, the present invention will be described.
[0006]
As the acrylic compound used in the present invention, one or more kinds are selected from acrylic acid, methacrylic acid, acrylic acid ester, methacrylic acid ester, unsaturated polyester, styrene, and styrene derivative, and a polymerization initiator, for example, Those to which a polymerization accelerator such as an amine or a metal soap is further added, if necessary, such as a sulfated oxide, hydrogen peroxide, a peroxide, an azo-based polymerization initiator, and a redox polymerization initiator of a redox type can be applied.
[0007]
For acrylates, alkyl acrylate, hydroxyalkyl acrylate, diethylene glycol acrylate, polyethylene glycol acrylate, glycidyl acrylate, ethylene glycol diacrylate, ethoxyalkyl acrylate And methacrylic acid esters such as alkyl methacrylate, hydroxyalkyl methacrylate, glycidyl methacrylate, ethylene glycol methacrylate, ethylene glycol dimethacrylate, and polyethylene glycol methacrylate. , Polyethylene glycol dimethacrylate alkyl: ethyl, methyl, pentyl, etc.). Examples of the styrene derivative include α-methylstyrene and p-methyl-α-methylstyrene. Preferably, it is desirable to use methyl methacrylate having good permeability and easy to polymerize.
[0008]
The cyclic ester compounds, beta-propiolactone, .delta.-valerolactone, .epsilon.-caprolactone, coumarin, Tetorin acid, and compounds such as off Tarido, select more than one or two among these derivatives, the reaction In order to carry out the reaction quickly and efficiently, it is possible to apply an alkali metal, a hydride of an alkali metal, a hydroxide, a carbonate, an alkyl metal aliphatic amine, an acid, and a metal halide as necessary. It is preferable to use ε-caprolactone which is cost-effective and highly reactive.
[0009]
It is desirable that the acrylic compound and the cyclic ester compound are mixed at a weight ratio of 1:99 to 99: 1, and when the amount of the cyclic ester compound is more than 1:99, the strength tends to be insufficient, and the acrylic compound tends to be insufficient. If the ratio is more than 99: 1, it is difficult to follow changes in the environment, the dimensional change becomes large, and cracks easily occur. It is in the range of 1: 5 to 5: 1 that is excellent in moisture resistance, bending strength, and appearance (especially, transparency and touch).
[0010]
The chemical solution can be diluted by adding various solvents compatible with each processing solution in order to control the amount of adhesion to wood, and in this case, the lower the reactivity with the chemical solution as the solvent, Preferably, as specific examples, aliphatic hydrocarbons such as hexane and heptane, aromatic hydrocarbons such as toluene and xylene, diethyl ether, diisopropyl ether, tetrahydrofuran, ethers such as dioxane, ethyl acetate, esters such as butyl acetate, Examples include ketones such as acetone and methyl ethyl ketone, as well as water and alcohols, but are not particularly limited thereto.
[0011]
It is desirable to use an injection method from the viewpoint of penetrating the chemical solution into the interior of the wood tissue. For example, a dipping method, reduced pressure injection, pressure injection, or a method combining these injection methods can be applied. The impregnation rate of the chemical is desirably 10 to 30% in terms of nonvolatile content in order to improve dimensional stability and strength without impairing the feel of wood. Here, the impregnation rate is represented by the formula 1 which is obtained by dividing the amount of the chemical solution adhered by the weight of the original wood and multiplying by 100.
[0012]
(Equation 1)
W = [(W 2 −W 1 ) / W 1 ] × 100 (%)
W: impregnation ratio W 2 : weight of wood after impregnation and drying W 1 : weight of original wood
Wood treated with the above chemicals can be cured by heat treatment such as hot-air heating, infrared heating, far-infrared heating, radiation, ultraviolet light, etc., and the heating temperature and heating time are controlled by acrylic compounds and cyclic esters. It is sufficient that the system compound is sufficiently cured and the wood is not damaged, and the conditions of the heat treatment are slightly different depending on the composition of the chemical solution and the curing agent, but are generally 80 to 140 ° C. and 0.1 to 8 hours. Is desirable. Furthermore, it is permissible to apply pressure simultaneously with heating using a flat plate press, a continuous press, or the like. In this case, curing is promoted and strength is excellent. The pressure condition at the time of pressurization is desirably set to such an extent as to promote hardening and not to damage the wood, and a condition of 5 to 20 kgf / cm 2 is suitable.
[0014]
Wood and wood-based materials applicable to the present invention include sawn timber, sliced veneers, laminated wood, particle boards, and the like. Specifically, red oak, hippopotamus, beech, beech, rawan, poplar, capo Hardwood, such as cedar, pine, larch, and cypress, softwood, such as cedar, pine, larch, and hinoki, rubber tree laminated wood, LVL (Laminated Vener Number), and the like. However, the present invention is not limited to these.
[0015]
[Action]
Wood is impregnated with a chemical solution containing an acrylic compound and a cyclic ester compound as main components, and cured to compensate for the drawbacks of ordinary low-impregnation WPC. And the shrinkage in wood due to the polymerization of the acrylic compound is alleviated, making it difficult to break.
[0016]
Hereinafter, examples and comparative examples will be described in detail.
【Example】
Example 1
A liquid solution (A) was obtained by mixing 250 g of methyl methacrylate (syrup) as an acrylic compound, 2.5 g of benzoyl peroxide as a polymerization initiator, 250 g of ε-caprolactone as a cyclic ester compound, and 500 g of toluene as a solvent. . Then, a cedar having a thickness of 5 mm, an air-dry specific gravity of 0.37 to 0.42, a length in the fiber direction of 300 mm, and a tangential direction of 100 mm is impregnated with the chemical solution (A) by a reduced pressure method so that the impregnation rate becomes 20% of non-volatile content. Then, it was heated in a hot air dryer at 120 ° C. for 3 hours to obtain the modified wood of Example 1.
[0017]
Example 2
300 g of polyethylene glycol monomethacrylate and 300 g of 2-hydroxyethyl methacrylate as an acrylic compound, 6.0 g of benzoyl peroxide as a polymerization initiator, 200 g of ε-caprolactone as a cyclic ester compound, and hydrochloric acid as a catalyst. 0 g and 200 g of distilled water as a solvent were mixed to obtain a drug solution (B). Next, the same cedar as in Example 1 was impregnated with the chemical solution (B) by a decompression method so that the impregnation rate became 20% as a non-volatile content, and the mixture was heated in a hot-air dryer at 120 ° C. for 3 hours. Quality wood was obtained.
[0018]
Example 3
A mixture of 300 g of glycidyl methacrylate and 300 g of styrene as an acrylic compound, 6.0 g of methyl ethyl ketone peroxide as a polymerization initiator, 6.0 g of cobalt octenoate as a catalyst, and 200 g of ε-caprolactone as a cyclic ester compound was mixed with a chemical solution (C ) Got. Next, the same cedar as in Example 1 was impregnated with the chemical solution (C) by a reduced pressure method so that the impregnation ratio became 20% in terms of non-volatile content, air-dried, and then hot-pressed at 60 ° C. under a pressure of 5 kgf / cm 2 for 30 minutes. The heated wood was pressed for a minute to obtain the modified wood of Example 3.
[0019]
Example 4
250 g of methyl methacrylate (syrup) as an acrylic compound, 2.5 g of benzoyl peroxide as a polymerization initiator, 250 g of δ-valerolactone as a cyclic ester compound, and 500 g of toluene as a solvent were mixed to give a drug solution (D). Obtained. Then, the same cedar as in Example 1 was impregnated with the chemical solution (D) by a reduced pressure method so that the impregnation rate became 20% in terms of nonvolatile content, and the mixture was heated in a hot air drier at 120 ° C. for 3 hours. Modified wood was obtained.
[0020]
Comparative Example 1
Without using a cyclic ester compound, 500 g of methyl methacrylate (syrup) as an acrylic compound, 500 g of styrene, and 2.0 g of benzoyl peroxide as a polymerization initiator were mixed to obtain a treating agent (a). Next, the same cedar as in Example 1 was impregnated with the treating agent (a) by a reduced pressure method so that the impregnation ratio became 20% in terms of non-volatile content, and heated in a hot air drier at 120 ° C. for 3 hours. The processed wood was obtained.
[0021]
Comparative Example 2
Without using a cyclic ester compound, 300 g of methyl methacrylate (syrup), 500 g of unsaturated polyester and 200 g of styrene as an acrylic compound, 6.0 g of benzoyl peroxide as a polymerization initiator, and 6.0 g of cobalt octylate as a catalyst. Was mixed to obtain a treating agent (b). Next, the same cedar as in Example 1 was impregnated with the treating agent (b) by a reduced pressure method so that the impregnation ratio became 20% in terms of non-volatile content, air-dried, and then hot pressed at 60 ° C. and a pressure of 5 kgf / cm 2 . It was heated and pressed for 30 minutes to obtain treated wood of Comparative Example 2.
[0022]
Comparative Example 3
Without using a cyclic ester compound, 400 g of polyethylene glycol monomethacrylate and 600 g of 2-hydroxyethyl methacrylate as acrylic compounds, and 10 g of methyl ethyl ketone peroxide as a polymerization initiator were mixed and treated as a treatment agent (c). Got. Next, the same cedar as in Example 1 was impregnated with the treating agent (c) by a reduced pressure method so that the impregnation ratio became 20% in terms of non-volatile content, and heated in a hot air drier at 120 ° C. for 3 hours. The processed wood was obtained.
[0023]
Comparative Example 4
Without using an acrylic compound, 300 g of ε-caprolactone as a cyclic ester compound, 6 g of hydrochloric acid as a catalyst, and 700 g of water as a solvent were mixed to obtain a treating agent (d). The treating agent (d) was impregnated by a pressure method so that the impregnation ratio was 20% as a non-volatile content. Subsequently, it was heated in a hot air dryer at 120 ° C. for 3 hours to obtain a treated wood of Comparative Example 4.
[0024]
The modified woods of Examples 1 to 4 and the treated woods of Comparative Examples 1 to 4 were evaluated for dimensional stability, hygroscopicity, bending strength, and cracking. For dimensional stability and hygroscopicity, the test specimen was allowed to stand in a constant temperature and humidity chamber at 40 ° C. to 30% RH and 40 ° C. to 90% RH until equilibrium was reached, and the anti-swelling ability (ASE) and anti-hygroscopicity (MEE) were measured. ) Was measured. A test was conducted on the bending strength based on JISZ2113. As for cracks, based on the JAS cold repetition A test, the process of leaving the product in a thermostat at 80 ° C for 2 hours and then leaving it in a thermostat at -20 ° C for 2 hours was repeated 5 cycles, and the product was left standing until it reached room temperature and the appearance was observed. It was confirmed, and “〇” indicates no crack, and “X” indicates crack. Table 1 shows the evaluation results.
[0025]
[Table 1]
【The invention's effect】
A modified wood obtained by injecting a chemical solution containing an acrylic compound and a cyclic ester compound as main components into wood and curing the wood is less likely to crack despite its lower impregnation rate than conventional WPC, and has dimensional stability, Excellent in strength physical properties.
[0027]
Further, since the impregnation rate of the chemical solution is as low as 10 to 30%, the feel and appearance of the wooden material are improved.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24720394A JP3553660B2 (en) | 1994-09-13 | 1994-09-13 | Manufacturing method of modified wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24720394A JP3553660B2 (en) | 1994-09-13 | 1994-09-13 | Manufacturing method of modified wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0880508A JPH0880508A (en) | 1996-03-26 |
| JP3553660B2 true JP3553660B2 (en) | 2004-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24720394A Expired - Fee Related JP3553660B2 (en) | 1994-09-13 | 1994-09-13 | Manufacturing method of modified wood |
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| JP (1) | JP3553660B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006205492A (en) * | 2005-01-27 | 2006-08-10 | Eidai Co Ltd | Woody fiber board and its production method |
| CN111775253A (en) * | 2020-07-17 | 2020-10-16 | 安徽三和工艺品有限公司 | Preparation method of impregnating resin for wickerwork |
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1994
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| Publication number | Publication date |
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| JPH0880508A (en) | 1996-03-26 |
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