JP3250855B2 - Method of improving formability of chemically modified wood - Google Patents
Method of improving formability of chemically modified woodInfo
- Publication number
- JP3250855B2 JP3250855B2 JP32376392A JP32376392A JP3250855B2 JP 3250855 B2 JP3250855 B2 JP 3250855B2 JP 32376392 A JP32376392 A JP 32376392A JP 32376392 A JP32376392 A JP 32376392A JP 3250855 B2 JP3250855 B2 JP 3250855B2
- Authority
- JP
- Japan
- Prior art keywords
- wood
- chemically modified
- vinyl acetate
- modified wood
- resin
- 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.)
- Expired - Fee Related
Links
Landscapes
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱可塑性を有する化学
修飾木材の成形加工性改善方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the moldability of chemically modified wood having thermoplasticity.
【０００２】[0002]
【従来の技術】近年、小径木、間伐材等の未利用木材
や、木材を使用する工業において工業廃棄物として副生
する木材端材などの有効利用法として、これらの木材小
片を化学的に処理して熱可塑性を付与せしめ、得られた
化学修飾木材粉を熱圧成形して木質成形品を製造する方
法が開発されており、例えば特開昭６０−１２４２０３
号公報、特開昭６０−８３８０６号公報及び特開昭６３
−１８３９１０号公報には種々の化学修飾方法が開示さ
れている。2. Description of the Related Art In recent years, as an effective use method of unused wood such as small-diameter trees and thinned wood, and wood offcuts that are by-produced as industrial waste in the wood-using industry, these small wood pieces are chemically treated. A method has been developed in which a process is performed to impart thermoplasticity, and the resulting chemically-modified wood powder is hot-pressed to produce a wood molded product.
JP, JP-A-60-83806 and JP-A-63-83806
JP-183910 discloses various chemical modification methods.
【０００３】すなわち、木材の主要な成分であるセルロ
ース、ヘミセルロース、リグニン等は水酸基を有するた
め、これら水酸基を上記公開公報に示されているような
種々の化学的改質法によって変性処理することにより、
木材に熱可塑性を与えることができる。例えば、二塩基
酸無水物とエポキシ化合物を木材粉に添加し、木材中で
エステルの合成を行うと、木材成分の水酸基が二塩基酸
無水物とエステル化反応して、二塩基酸無水物が付加さ
れると共に側鎖にフリーのカルボキシル基が導入され、
このカルボキシル基にエポキシ化合物のエポキシ基が付
加エステル化する反応、あるいはさらにこの付加エステ
ル化反応によって生じた水酸基に二塩基酸無水物とエポ
キシ化合物が交互に付加する交互エステル化反応を生じ
て、木材成分へエステル基が導入される。That is, since cellulose, hemicellulose, lignin, and the like, which are the main components of wood, have hydroxyl groups, these hydroxyl groups can be modified by various chemical modification methods as disclosed in the above publication. ,
Wood can be made thermoplastic. For example, when a dibasic acid anhydride and an epoxy compound are added to wood powder and an ester is synthesized in the wood, the hydroxyl group of the wood component undergoes an esterification reaction with the dibasic acid anhydride to form a dibasic acid anhydride. At the same time, a free carboxyl group is introduced into the side chain,
The carboxyl group undergoes an addition esterification reaction of the epoxy group of the epoxy compound, or an alternate esterification reaction in which the dibasic acid anhydride and the epoxy compound are alternately added to the hydroxyl group generated by the addition esterification reaction, and An ester group is introduced into the component.
【０００４】上記のようにして木材成分の水酸基がエス
テル基に変わることにより、水素結合の減少、側鎖の導
入による結晶性の低下等がおこる。このため、本来熱可
塑性を持たない木材に熱可塑性を付与する事ができる。
この際、二重結合を有するエポキシ化合物または二塩基
酸無水物を用い、架橋剤、例えば過酸化物と組み合わせ
ることにより、一般の熱硬化性樹脂の様に、加熱により
３次元架橋構造を作る熱硬化性の素材を得る事ができ
る。さらに、不飽和ポリエステル樹脂を添加する事によ
り、成形加工時の流動性を高める事ができる。[0004] When the hydroxyl group of the wood component is changed to an ester group as described above, a decrease in hydrogen bonding and a decrease in crystallinity due to the introduction of a side chain occur. For this reason, thermoplasticity can be imparted to wood that does not originally have thermoplasticity.
At this time, by using an epoxy compound or a dibasic acid anhydride having a double bond and combining with a crosslinking agent such as a peroxide, a heat-forming three-dimensional cross-linked structure is obtained by heating like a general thermosetting resin. A curable material can be obtained. Furthermore, by adding an unsaturated polyester resin, the fluidity during molding can be increased.
【０００５】前記化学修飾木材から成る素材は、熱圧プ
レス、射出成形等の成形方法により成形加工が可能で、
任意の形状に加工する事ができる。成形加工は過酸化物
架橋剤がラジカルを発生する温度以上の温度で行われ、
該素材内部ではラジカル反応により３次元架橋構造が形
成される。成形加工時の温度としては、一般に１２０℃
以上２００℃以下の温度が用いられる。[0005] The material made of the chemically modified wood can be molded by a molding method such as hot press or injection molding.
It can be processed into any shape. The molding process is performed at a temperature equal to or higher than the temperature at which the peroxide crosslinking agent generates radicals,
Inside the material, a three-dimensional crosslinked structure is formed by a radical reaction. The temperature during molding is generally 120 ° C.
A temperature of at least 200 ° C. is used.
【０００６】[0006]
【発明が解決しようとする課題】前記のように、化学修
飾木材は熱圧プレス、射出成形等の成形方法により成形
加工が可能であるが、加工時の流動性に関しては、これ
まで使用されてきた不飽和ポリエステル樹脂の添加だけ
では不十分な点がある。すなわち、不飽和ポリエステル
樹脂は、架橋構造をつくる前には低分子量化合物であ
り、化学修飾木材の流動性を改善するには十分ではな
い。特に射出成形のように高い剪断応力を受ける加工に
おいては、不飽和ポリエステル樹脂と化学修飾木材の分
離が起こり、十分な流動性が得られない場合がある。ま
た、熱圧プレス等の成形法においても、架橋前の不飽和
ポリエステル樹脂が金型から搾り出され、内部の可塑化
が十分に進行せず、内部に巣の入る場合がある。As described above, chemically modified wood can be formed by a molding method such as hot press or injection molding. However, regarding the fluidity during processing, it has been used so far. There is a point where the addition of the unsaturated polyester resin alone is not sufficient. That is, the unsaturated polyester resin is a low molecular weight compound before forming a crosslinked structure, and is not sufficient to improve the flowability of the chemically modified wood. In particular, in a process such as injection molding that receives a high shear stress, separation of the unsaturated polyester resin and the chemically modified wood occurs, and sufficient fluidity may not be obtained in some cases. Also, in a molding method such as a hot press, the unsaturated polyester resin before crosslinking may be squeezed out of the mold, and the plasticization of the inside may not proceed sufficiently, and nests may enter inside.
【０００７】一方、汎用の合成樹脂の成形加工性を改善
するためには、一般的に加工助剤が用いられている。代
表的な加工助剤としてステアリン酸等があり、ゲル化の
タイミングの調整に用いられる。また、成形加工時の見
かけの粘度を低下させる目的で滑剤が添加される。代表
的な滑剤としてポリエチレンワックス等がある。しか
し、これら化合物は、混合される樹脂との相溶性によっ
ては製品にブリードアウト等の問題を生じる。また、低
分子量の加工助剤は加熱成形時に揮散等の問題があり、
作業環境を悪化させる。On the other hand, in order to improve the moldability of general-purpose synthetic resins, processing aids are generally used. Typical processing aids include stearic acid and the like, which are used to adjust the timing of gelation. Further, a lubricant is added for the purpose of lowering the apparent viscosity during molding. Typical lubricants include polyethylene wax. However, these compounds cause problems such as bleed-out in products depending on the compatibility with the resin to be mixed. In addition, low molecular weight processing aids have problems such as volatilization during heat molding,
Deteriorate working environment.
【０００８】従って、本発明の目的は、前記したような
問題もなく、化学修飾木材の成形加工時の流動性を改善
し、成形加工を容易にすることにあり、もって良好な品
質の木質成形品を生産性よく提供しようとするものであ
る。Accordingly, an object of the present invention is to improve the fluidity of a chemically modified wood during the molding process and to facilitate the molding process without the above-mentioned problems, and thus to provide a good quality woody molding. The goal is to provide products with high productivity.
【０００９】[0009]
【課題を解決するための手段】本発明は、化学修飾木材
にエチレン酢酸ビニル樹脂を添加する事により、化学修
飾木材の成形加工時の流動性を高め、成形加工性を改善
する事を特徴とする。SUMMARY OF THE INVENTION The present invention is characterized in that by adding ethylene vinyl acetate resin to chemically modified wood, the flowability of the chemically modified wood at the time of molding processing is increased and the moldability is improved. I do.
【００１０】本発明で使用する化学修飾木材とは、木材
中の水酸基を化学的に変性する事により、木材そのもの
にはない熱可塑性を付与したものである。例えば、ハロ
ゲン化アリルを用いて木質材料をアリル化したもの、木
質材料を強アルカリで処理した後塩化ベンジルを用いて
木質材料をベンジル化したもの、無水トリフルオロ酢酸
と酢酸あるいはラウロイル酸等の脂肪酸を用いて木質材
料をアシル化したもの、脂肪酸のカリウム塩の存在下エ
ポキシ化合物を用いて木質材料をエーテル化したものが
ある。また、前述した特開昭６０−１２４２０３号公報
に記載の木質成分中の水酸基に二塩基酸無水物を付加し
たカルボキシル基含有エステル化木材小片に１分子中に
２個以上のエポキシ基を有するエポキシ化合物を反応さ
せたもの、さらに特開昭６０−８３８０６号公報及び特
開昭６３−１８３９１０号公報に開示されているよう
に、木質成分中の水酸基に多塩基酸無水物と不飽和二重
結合を有するモノエポキシ化合物とを交互に付加エステ
ル化反応させたもの、あるいはさらにこれらに多塩基酸
無水物と不飽和二重結合を有するモノエポキシ化合物か
ら得られるオリゴマーを併存させたものなどを用いるこ
とができる。[0010] The chemically modified wood used in the present invention is a wood which has a thermoplastic property which wood itself does not have by chemically modifying a hydroxyl group in the wood. For example, those obtained by allylating a wood material using an allyl halide, those obtained by treating a wood material with a strong alkali and then benzylating the wood material with benzyl chloride, trifluoroacetic anhydride and acetic acid, or fatty acids such as lauroyl acid. And those obtained by etherifying a wood material with an epoxy compound in the presence of a potassium salt of a fatty acid. Also, carboxyl group-containing esterified wood chips obtained by adding a dibasic acid anhydride to a hydroxyl group in a wood component described in JP-A-60-124203 described above have an epoxy having two or more epoxy groups in one molecule. As disclosed in JP-A-60-83806 and JP-A-63-183910, a polybasic acid anhydride and an unsaturated double bond are added to a hydroxyl group in a woody component. Using a monoepoxy compound having a carboxylic acid and an oligomer obtained from a polybasic anhydride and a monoepoxy compound having an unsaturated double bond. Can be.
【００１１】本発明で使用する化学修飾木材としては、
上記例示のものに限定されるものではないが、ここでは
製造工程が簡単で副生物の少ない多塩基酸無水物と不飽
和二重結合を有するモノエポキシ化合物を併用して反応
させたものについて簡単に説明する。木材小片を多塩基
酸無水物、例えば無水マレイン酸、無水コハク酸、無水
フタル酸で処理し、木材中に化学結合によりカルボキシ
ル基を導入する。次に、得られたカルボキシル基導入木
材にモノエポキシ化合物と酸無水物を交互に付加させる
とオリゴエステル化木材が得られる。この場合、アリル
グリシジルエーテル、グリセリンモノエステル、グリシ
ジルメタクリレートのような不飽和二重結合を有するモ
ノエポキシ化合物を使用すると重合性二重結合を有する
オリゴエステル鎖が生成する。このような重合性のオリ
ゴエステル鎖を有するオリゴエステル化木材、即ち化学
修飾木材は架橋性を有しており、熱圧プレス、射出成形
により成形が可能である（詳細については前記公開公報
を参照されたい）。The chemically modified wood used in the present invention includes:
Although not limited to those exemplified above, here, the production process is simple, and a simple reaction is performed by using a polybasic acid anhydride having few by-products and a monoepoxy compound having an unsaturated double bond in combination. Will be described. Wood pieces are treated with polybasic acid anhydrides, such as maleic anhydride, succinic anhydride, phthalic anhydride, and carboxyl groups are introduced into the wood by chemical bonding. Next, an oligoesterified wood is obtained by alternately adding a monoepoxy compound and an acid anhydride to the obtained carboxyl group-introduced wood. In this case, when a monoepoxy compound having an unsaturated double bond such as allyl glycidyl ether, glycerin monoester, or glycidyl methacrylate is used, an oligoester chain having a polymerizable double bond is generated. Oligoesterified wood having such a polymerizable oligoester chain, that is, chemically modified wood, has a cross-linking property and can be molded by hot-pressing or injection molding (for details, see the above publication). I want to.)
【００１２】[0012]
【発明の作用及び態様】化学修飾木材を射出成形等によ
り成形する場合、型内に充填されるまで架橋反応が起こ
らない温度で加工される。具体的には１００℃以下の温
度が適切である。しかし、１００℃以下の温度では、化
学修飾木材のみでは十分な可塑性が得られない場合があ
る。不飽和ポリエステル樹脂の添加により可塑性を向上
させることができるが、前述した様な問題があり、十分
な可塑性を得るに至らない。そのため、化学修飾木材の
成形加工時の流れはかなり硬い流れとなる。この様な硬
い流体を射出成形に用いた場合、背圧が高くなり、投影
面積に比例して大きな型締力を必要とし、細部への充填
が困難である。また、熱圧プレスにより成形する場合に
おいても、金型内での流動が不十分となり、十分な成形
ができない場合がある。When a chemically modified wood is molded by injection molding or the like, it is processed at a temperature at which a crosslinking reaction does not occur until it is filled in a mold. Specifically, a temperature of 100 ° C. or less is appropriate. However, at a temperature of 100 ° C. or lower, sufficient plasticity may not be obtained only with chemically modified wood. Although plasticity can be improved by adding an unsaturated polyester resin, there is a problem as described above, and sufficient plasticity cannot be obtained. Therefore, the flow at the time of forming the chemically modified wood is a considerably hard flow. When such a hard fluid is used for injection molding, the back pressure becomes high, a large clamping force is required in proportion to the projected area, and it is difficult to fill the details. Also, when molding by a hot press, there is a case where the flow in the mold becomes insufficient and sufficient molding cannot be performed.
【００１３】また、一般に、合成樹脂の成形加工性を向
上させるためにステアリン酸等の加工助剤が添加されて
いる。しかし、ステアリン酸等の低分子量化合物を用い
た場合、前述した様にブリードアウト等の問題を生じ
る。一方、滑剤等を添加し、見かけの粘度を低下させる
方法においても、前述の様な低温で効果を表す滑剤は比
較的低分子量の物が多く、同様にブリードアウトの問題
を生じる。Generally, a processing aid such as stearic acid is added in order to improve the moldability of the synthetic resin. However, when a low molecular weight compound such as stearic acid is used, problems such as bleed out occur as described above. On the other hand, even in the method of adding a lubricant or the like to lower the apparent viscosity, many of the above-mentioned lubricants exhibiting an effect at a low temperature have a relatively low molecular weight, and similarly cause a problem of bleed-out.
【００１４】この様な問題を解決する方法として高分子
量化合物の添加が考えられる。しかし、一般的に、高分
子である化学修飾木材に異なる高分子成分を添加した場
合には物性の低下が起こる。特に化学修飾木材は極性が
強く、オレフィン系樹脂との相溶性は無い。しかし、１
００℃以下の低温で可塑性を与える高分子としてはオレ
フィン系樹脂が適しており、エステル系、アミド系樹脂
は融点が高く、低温での成形加工には適していない。オ
レフィン系樹脂は、ゴムに代表されるように１００℃以
下の低温での成形加工が可能で、実際に化学修飾木材に
添加した場合、見かけの粘度を下げる働きがある。しか
し、小量の添加によっても引張破断強度、引張破断伸び
共に減少し、製品としての性能を著しく損なう。As a method for solving such a problem, addition of a high molecular weight compound can be considered. However, in general, when different polymer components are added to chemically modified wood, which is a polymer, physical properties decrease. In particular, chemically modified wood has a strong polarity and has no compatibility with olefin resins. However, 1
An olefin resin is suitable as a polymer that provides plasticity at a low temperature of 00 ° C. or less, and an ester or amide resin has a high melting point and is not suitable for molding at a low temperature. The olefin-based resin can be molded at a low temperature of 100 ° C. or less, as represented by rubber, and has a function of lowering the apparent viscosity when actually added to chemically modified wood. However, even with the addition of a small amount, both the tensile strength at break and the tensile elongation at break decrease, and the performance as a product is significantly impaired.
【００１５】オレフィン系樹脂の低温で成形加工できる
特性を有し、しかも極性を有する樹脂としてエチレン酢
酸ビニル樹脂があり、本発明は化学修飾木材の成形加工
性を改善するための添加剤としてエチレン酢酸ビニル樹
脂を用いることを特徴としている。エチレン酢酸ビニル
樹脂は１００℃以下の低温で柔らかくなり、可塑剤とし
ての機能を有する。さらに、酢酸ビニルの含量を調整す
ることにより、大きな範囲で物性を変化させることがで
きる。一般に、エチレン酢酸ビニル樹脂は、酢酸ビニル
含量が小さい場合、その性質はポリエチレンに近く、多
い場合には酢酸ビニル樹脂の性質に近い。酢酸ビニルの
含量が６０重量％付近で破断伸びが最大、剛性率が最小
となり、また酢酸ビニルの含量が６０重量％までは２次
転移温度はほぼ−２０℃である。酢酸ビニル含量が１０
重量％以上のエチレン酢酸ビニル樹脂は８０℃程度の温
度で十分な可塑性を持ち、成形加工が可能になる。従っ
て、化学修飾木材に添加し、流動性を改善する目的に
は、酢酸ビニル含量が１０重量％〜８０重量％のエチレ
ン酢酸ビニル樹脂が好適である。[0015] Ethylene vinyl acetate resin is a resin having the property of being able to be molded at a low temperature of an olefin resin, and is a polar resin. It is characterized by using a vinyl resin. The ethylene vinyl acetate resin becomes soft at a low temperature of 100 ° C. or less, and has a function as a plasticizer. Further, by adjusting the content of vinyl acetate, the physical properties can be changed in a large range. Generally, when the vinyl acetate content is small, the properties of the ethylene vinyl acetate resin are close to those of polyethylene, and when it is high, the properties are close to those of the vinyl acetate resin. When the content of vinyl acetate is around 60% by weight, the elongation at break becomes maximum and the rigidity becomes minimum, and the secondary transition temperature is approximately -20 ° C. when the content of vinyl acetate is up to 60% by weight. Vinyl acetate content of 10
The ethylene vinyl acetate resin of not less than 80% by weight has sufficient plasticity at a temperature of about 80 ° C., and can be molded. Therefore, ethylene vinyl acetate resin having a vinyl acetate content of 10% by weight to 80% by weight is suitable for the purpose of adding to chemically modified wood to improve flowability.
【００１６】また、エチレン酢酸ビニル樹脂は酢酸ビニ
ルとしてエステル基を有する事から、化学修飾木材との
相溶性に優れており、その相溶性は酢酸ビニル含量によ
り影響される。酢酸ビニルの含量が多いほど相溶性に優
れており、この点からはできるだけ酢酸ビニル含量の多
いエチレン酢酸ビニル樹脂が好ましい。相溶性の如何に
より成形加工後の製品の性能が変化し、相溶性の高いエ
チレン酢酸ビニル樹脂を添加した場合、伸びの増加が観
察される。一方、相溶性に乏しいエチレン酢酸ビニル樹
脂を添加した場合、破断強度が著しく減少する。しか
し、酢酸ビニル含量が極端に多い場合、酢酸ビニル樹脂
の特性に近づき、伸びが減少する。この様な相溶性と製
品の性能を考慮すると、添加するエチレン酢酸ビニル樹
脂の酢酸ビニル含量としては、１０重量％以上８０重量
％の範囲のものが適している。これ以外の含量範囲のエ
チレン酢酸ビニル樹脂は、その添加による化学修飾木材
の流動性に関する改善効果が小さく、多量の添加を必要
とし、さらに製品の物性を低下させるので好ましくな
い。Further, since ethylene vinyl acetate resin has an ester group as vinyl acetate, it has excellent compatibility with chemically modified wood, and the compatibility is affected by the vinyl acetate content. The higher the content of vinyl acetate, the better the compatibility. From this point, an ethylene vinyl acetate resin having the highest possible vinyl acetate content is preferred. Depending on the compatibility, the performance of the product after molding changes, and when a highly compatible ethylene vinyl acetate resin is added, an increase in elongation is observed. On the other hand, when an ethylene vinyl acetate resin having poor compatibility is added, the breaking strength is significantly reduced. However, when the vinyl acetate content is extremely high, the properties approach those of the vinyl acetate resin, and the elongation decreases. Considering such compatibility and product performance, the vinyl acetate content of the added ethylene vinyl acetate resin is preferably in the range of 10% by weight to 80% by weight. Ethylene vinyl acetate resin having a content in a range other than this range is not preferred because its addition has a small effect of improving the fluidity of the chemically modified wood, requires a large amount of addition, and further reduces the physical properties of the product.
【００１７】エチレン酢酸ビニル樹脂を化学修飾木材へ
添加した場合、０．５重量部程度の添加で流動性が改善
され、図１に示す様に、見かけの粘度が低下する。図１
は、キャピラリーレオメータによって化学修飾木材粉１
００重量部当り０．５〜１０重量部のエチレン酢酸ビニ
ル樹脂（酢酸ビニル含量２５重量％）を添加した混合物
の見かけの粘度を測定したもので、化学修飾木材の粘度
はエチレン酢酸ビニル樹脂の添加量が増すに従って低下
する。製品の物性に関しては、１５重量部程度添加して
も引張破断強度の顕著な低下は観察されず、引張破断伸
びはむしろ増大する。また、熱圧プレス等の高温での成
形に於ても表面へのブリードアウトは観察されない。When ethylene vinyl acetate resin is added to chemically modified wood, the flowability is improved by adding about 0.5 parts by weight, and the apparent viscosity is reduced as shown in FIG. FIG.
Is chemically modified wood powder 1 by a capillary rheometer.
The apparent viscosity of the mixture to which 0.5 to 10 parts by weight of ethylene vinyl acetate resin (vinyl acetate content: 25% by weight) was added per 100 parts by weight was measured. The viscosity of the chemically modified wood was determined by adding the ethylene vinyl acetate resin. It decreases as the amount increases. Regarding the physical properties of the product, even when about 15 parts by weight are added, no remarkable decrease in the tensile strength at break is observed, and the tensile elongation at break is rather increased. Also, no bleed-out to the surface is observed in molding at a high temperature such as a hot press.
【００１８】エチレン酢酸ビニル樹脂は粉末として入手
可能で、化学修飾木材粉とはヘンシェルミキサー等の粉
体混合機により混合が可能である。また、さらに化学修
飾木材中での分散を必要とする場合にはロールミキサー
による混練り、押出機によるペレット化等が可能であ
る。The ethylene vinyl acetate resin is available as a powder, and can be mixed with the chemically modified wood powder by a powder mixer such as a Henschel mixer. Further, when dispersion in chemically modified wood is required, kneading by a roll mixer, pelletization by an extruder, and the like are possible.
【００１９】[0019]
【実施例】以下、本発明を実施例、比較例および製造例
によってさらに具体的に説明するが、本発明はこれらに
制限されるものではない。なお、以下に記載した「部」
は「重量部」を表す。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, Comparative Examples and Production Examples, but the present invention is not limited to these. In addition, "part" described below
Represents "parts by weight".
【００２０】まず、本発明において使用する化学修飾木
材の製造例について述べる。 製造例１ 木質材として２４メッシュ篩を通過した赤松材の乾燥木
材粉１００．０部、無水マレイン酸２６．５部を攪拌
機、還流冷却器を付けた反応釜に添加して、１２０℃で
１時間攪拌し、次に無水マレイン酸に対して１．３モル
倍のアリルグリシジルエーテル４０．１部を約１５分か
けて滴下した。滴下後、同温度で１時間交互付加エステ
ル化反応を行い、化学修飾木材を得た。First, a production example of the chemically modified wood used in the present invention will be described. Production Example 1 As a wood material, 100.0 parts of dried red pine wood powder and 26.5 parts of maleic anhydride passed through a 24-mesh sieve were added to a reactor equipped with a stirrer and a reflux condenser. The mixture was stirred for an hour, and then 40.1 parts of allyl glycidyl ether, which was 1.3 mol times the amount of maleic anhydride, was added dropwise over about 15 minutes. After the dropping, alternate addition esterification was performed at the same temperature for 1 hour to obtain a chemically modified wood.
【００２１】実施例１ 製造例１で得られた化学修飾木材１００部に対し、不飽
和ポリエステル樹脂１０部、およびジクミルパーオキサ
イド３．３部、酢酸ビニル含量２４重量％のエチレン酢
酸ビニル樹脂２部を添加し、容量１０リットルの小型ヘ
ンシェルミキサーを用いて混合し、さらにローラーミキ
サーにて混練を行った。次に、該化学修飾木材混合物を
温度１８０℃、圧力１００Ｋｇ・ｆ／ｃｍ2 、時間１５
分間の条件で熱圧プレスにより成形を行い、プラスチッ
ク様木質成形品を得た。該成形品は型中で均一に成形さ
れ、表面は光沢を持ち、さらに断面においても均一な成
形物が得られた。Example 1 To 100 parts of the chemically modified wood obtained in Production Example 1, 10 parts of an unsaturated polyester resin, 3.3 parts of dicumyl peroxide, and ethylene vinyl acetate resin 2 having a vinyl acetate content of 24% by weight Were mixed using a small Henschel mixer having a capacity of 10 liters, and kneaded with a roller mixer. Next, the chemically modified wood mixture was heated at a temperature of 180 ° C. under a pressure of 100 kgf / cm 2 for 15 hours.
Molding was performed by a hot press under the conditions of minutes to obtain a plastic-like wooden molded product. The molded product was uniformly molded in the mold, and the surface was glossy, and a uniform molded product was obtained even in the cross section.
【００２２】比較例１ 実施例１において、エチレン酢酸ビニル樹脂２部を添加
しなかったこと以外は実施例１と同様に成形して、プラ
スチック様木質成形品を得た。該成形品には一部に充填
不良と思われる表面光沢の無い箇所が見られ、その断面
には亀裂が観察された。Comparative Example 1 A plastic-like wooden molded product was obtained in the same manner as in Example 1, except that 2 parts of ethylene vinyl acetate resin was not added. In the molded article, a part having no surface gloss, which was considered to be defective in filling, was observed, and a crack was observed in the cross section thereof.
【００２３】[0023]
【発明の効果】以上のように、本発明の化学修飾木材の
成形加工性改善方法は、低温で成形加工できる特性を有
し、しかも極性を有し化学修飾木材との相溶性に優れて
いるエチレン酢酸ビニル樹脂を添加するものであるた
め、化学修飾木材の流動性が改善され、ブリートアウト
等の問題を生じることもなく、均一な品質でしかも表面
平滑性に優れた成形品を加工性良く製造することができ
る。得られた成形品は、木材の持つ軽くて二次加工性に
優れる性質をそのまま保持しており、広範囲の分野にお
いて木質様工業用材料として好適に用いることができ
る。As described above, the method for improving the formability of chemically modified wood according to the present invention has the property of being able to be formed at low temperatures, and is polar and has excellent compatibility with chemically modified wood. Because of the addition of ethylene vinyl acetate resin, the flowability of chemically modified wood is improved, and problems such as bleedout do not occur, and molded products with uniform quality and excellent surface smoothness can be processed with good processability. Can be manufactured. The obtained molded article retains the properties of wood which are light and excellent in secondary workability, and can be suitably used as a woody industrial material in a wide range of fields.
【図１】エチレン酢酸ビニル樹脂を添加した化学修飾木
材粉の粘度変化を示すグラフである。FIG. 1 is a graph showing a change in viscosity of a chemically modified wood powder to which an ethylene vinyl acetate resin is added.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B27N 1/00 B27K 3/18 B27K 5/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) B27N 1/00 B27K 3/18 B27K 5/00
Claims (2)
を添加する事を特徴とする化学修飾木材の成形加工性改
善方法。1. A method for improving the processability of chemically modified wood, characterized by adding an ethylene vinyl acetate resin to the chemically modified wood.
ビニル成分の量が１０重量％以上８０重量％以下である
事を特徴とする請求項１記載の化学修飾木材の成形加工
性改善方法。2. The method according to claim 1, wherein the amount of the vinyl acetate component contained in the ethylene vinyl acetate resin is 10% by weight or more and 80% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32376392A JP3250855B2 (en) | 1992-11-10 | 1992-11-10 | Method of improving formability of chemically modified wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32376392A JP3250855B2 (en) | 1992-11-10 | 1992-11-10 | Method of improving formability of chemically modified wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06143214A JPH06143214A (en) | 1994-05-24 |
| JP3250855B2 true JP3250855B2 (en) | 2002-01-28 |
Family
ID=18158354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32376392A Expired - Fee Related JP3250855B2 (en) | 1992-11-10 | 1992-11-10 | Method of improving formability of chemically modified wood |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3250855B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2024077920A (en) * | 2022-11-29 | 2024-06-10 | 国立研究開発法人産業技術総合研究所 | Production method for recycled woody molding material and woody molding material, as well as production method for recycled molding body and woody molding body |
-
1992
- 1992-11-10 JP JP32376392A patent/JP3250855B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06143214A (en) | 1994-05-24 |
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