JPH08218246A - Biodegradable net member - Google Patents
Biodegradable net memberInfo
- Publication number
- JPH08218246A JPH08218246A JP7046328A JP4632895A JPH08218246A JP H08218246 A JPH08218246 A JP H08218246A JP 7046328 A JP7046328 A JP 7046328A JP 4632895 A JP4632895 A JP 4632895A JP H08218246 A JPH08218246 A JP H08218246A
- Authority
- JP
- Japan
- Prior art keywords
- net
- poly
- flat yarn
- acid copolymer
- net member
- 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.)
- Pending
Links
Landscapes
- Protection Of Plants (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Revetment (AREA)
- Biological Depolymerization Polymers (AREA)
- Woven Fabrics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば、護岸工事等で
地盤等を安定化させるのに用いられるネット、草木類の
根等を絡ませて地盤等を安定化させる植生用ネット、又
は、例えば、芝生等の上に被せて芝生等を繁殖させる芝
生等の繁殖用ネット等に使用される生分解性を有するネ
ット部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a net used for stabilizing the ground in revetment work, a net for vegetation for stabilizing the ground by entwining the roots of plants and the like, or The present invention relates to a biodegradable net member used for a breeding net of a lawn or the like for covering the lawn or the like to propagate the lawn or the like.
【０００２】[0002]
【従来技術】従来より、護岸工事での地盤安定化用ネッ
ト、草木類の植成用ネット及び芝生等の繁殖用ネット等
としては、ポリプロピレン、ポリエチレン等のプラスチ
ックから成るフラットヤ−ン、或は生分解性を有するレ
−ヨン糸等を織成又は編組したネット部材が使用されて
いる。2. Description of the Related Art Conventionally, ground stabilization nets for revetment work, planting nets for vegetation and breeding nets for lawns, etc. have been flat yarns made of plastics such as polypropylene and polyethylene, or raw nets. A net member made of woven or braided rayon yarn having decomposability is used.
【０００３】従来のプラスチックから成るフラットヤ−
ンは、護岸工事での地盤安定化用ネット部材、草木類の
植成用ネット部材及び芝生等の繁殖用ネット部材等とし
て使用された場合、その使用目的が完了しても、回収す
るには多大な労力を要することや、土中等に埋設され
て、草木類の根等を絡ませて使用するので回収し難い等
のために、そのままの状態で放置されている。その結
果、環境汚染等の様々な問題を引き起こすことが懸念さ
れている。一方、生分解性を有するレ−ヨン糸からなる
ネット部材は強度が弱く、実用上問題がある。更に、レ
−ヨンは天然素材であるために安定した供給が難しい。
また、レ−ヨンを製造するためには、樹木伐採が行なわ
れ環境破壊を引き起す問題等も指摘されている。[0003] A conventional flat wire made of plastic
Is used as a ground stabilization net member for revetment work, a planting net member for vegetation, and a breeding net member for lawns, etc. It is left as it is because it requires a lot of labor and it is buried in the soil and used because the roots of vegetation are entangled and it is difficult to recover. As a result, it is feared that various problems such as environmental pollution will be caused. On the other hand, a net member made of rayon yarn having biodegradability is weak in strength and has a practical problem. Furthermore, rayon is a natural material, so stable supply is difficult.
Further, it has been pointed out that trees are felled in order to manufacture rayon, which causes environmental damage.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記のよう
な従来のネット部材と異なり、その使用目的が完了し、
そのまま土中、水中等の自然界に放置された状態でも、
その全体が微生物によって完全に分解される生分解性プ
ラスチックからなるネット部材を提供することを課題と
する。The present invention is different from the above-mentioned conventional net member in that the purpose of use is completed,
Even if it is left in the soil as it is, in the natural world such as underwater,
An object of the present invention is to provide a net member which is entirely made of biodegradable plastic which is completely decomposed by microorganisms.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、前記課題
を解決するために鋭意検討を重ねた結果、遂に本発明に
到達した。本発明の特徴とする点は、ポリカプロラクト
ン及び／又はポリ３−ヒドロキシ酪酸／３−ヒドロキシ
吉草酸共重合体からなるフラットヤ−ンを用いて織成又
は編組してなる生分解性ネット部材を提供する点にあ
る。更に、本発明の特徴とする点は、ポリカプロラクト
ン６０〜９０重量％及びポリ３−ヒドロキシ酪酸／３−
ヒドロキシ吉草酸共重合体４０〜１０重量％を配合して
なる組成物から製造される生分解性ネット部材を提供す
る点にある。Means for Solving the Problems The present inventors finally arrived at the present invention as a result of intensive studies for solving the above problems. A feature of the present invention is to provide a biodegradable net member formed by weaving or braiding using a flat yarn made of polycaprolactone and / or poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer. There is a point to do. Further, a feature of the present invention is that 60 to 90% by weight of polycaprolactone and poly-3-hydroxybutyric acid / 3-
It is a point to provide a biodegradable net member produced from a composition containing 40 to 10% by weight of hydroxyvaleric acid copolymer.
【０００６】本発明に係るポリカプロラクトンとして
は、環状モノマ−であるε−カプロラクトンの開環重合
により化学的に合成される生分解性脂肪族ポリエステル
を例示できる。斯かるポリε−カプロラクトンは、融点
が約６０℃と低く、５０℃を越えるとベタツキ、軟化し
易い傾向がある。そのために、単体のフィルムとして使
用するには好ましくない場合が多い。しかしながら、こ
のようなポリε−カプロラクトンは、加熱溶融時の弾性
が高く、伸度がポリエチレン、ポリプロピレン等のポリ
オレフィン系樹脂と同等か、それ以上であるため、高度
の延伸を施すことができ、高強度を有するフラットヤ−
ンを製造するのに好ましい。従って、斯かるフラットヤ
−ンは、ネット部材の素材として好適に使用することが
できる。Examples of the polycaprolactone according to the present invention include biodegradable aliphatic polyester chemically synthesized by ring-opening polymerization of ε-caprolactone which is a cyclic monomer. Such poly ε-caprolactone has a low melting point of about 60 ° C., and if it exceeds 50 ° C., it tends to become sticky and soften. Therefore, it is often not preferable to use as a single film. However, such poly ε-caprolactone has a high elasticity during heating and melting, and has an elongation equal to or higher than that of a polyolefin resin such as polyethylene or polypropylene, so that it can be stretched to a high degree, Flat tire with strength
It is preferred to produce Therefore, such a flat yarn can be suitably used as a material for the net member.
【０００７】一方、本発明に係るポリ３−ヒドロキシ酪
酸／３−ヒドロキシ吉草酸共重合体としては、例えば、
水素細菌Ａｌｃａｌｉｇｅｎｅｓ ｅｕｔｒｏｐｈｕｓ
にグルコ−スを基質として与え培養すると、菌体が増殖
し、菌体内にポリヒドロキシ酪酸ポリマ−が蓄積され
る。次いで、この過程で、グルコ−スとプロピオン酸を
炭素源として与え、更に培養を続けると、ポリマ−のヒ
ドロキシ酪酸ユニットの中にヒドリキシ吉草酸ユニット
がランダムに組込まれて、生合成される、極めて優れた
生分解性を有するポリ３−ヒドロキシ酪酸／３−ヒドロ
キシ吉草酸共重合体を例示できる。しかしながら、この
ようなポリ３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸
共重合体は、結晶性が高く、固くて脆いために、単体の
フィルムとしては使用されない場合が多い。しかしなが
ら用途によっては、例えば、フィルム、シ−ト等に製膜
し、適宜な幅にスリットして、例えば、一方方向に一軸
延伸して製造されると、極めて優れた生分解性を有する
フラットヤ−ン等として使用できる。On the other hand, examples of the poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer according to the present invention include:
Hydrogen bacterium Alcaligenes eutrophus
When glucose is used as a substrate and cultured, the cells grow and polyhydroxybutyric acid polymer is accumulated in the cells. Then, in this process, glucose and propionic acid were supplied as carbon sources, and when the culture was further continued, the hydroxyvaleric acid unit was randomly incorporated into the hydroxybutyric acid unit of the polymer and biosynthesized. An example is a poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer having excellent biodegradability. However, such a poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer has high crystallinity, is hard and brittle, and is often not used as a single film. However, depending on the use, for example, when a film, a sheet, or the like is formed into a film, slit into an appropriate width, and uniaxially stretched in one direction, for example, a flat yarn having extremely excellent biodegradability is produced. It can be used as a connector.
【０００８】また、本発明に係るポリε−カプロラクト
ンに３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重合
体とを配合した組成物としては、配合比率を、ポリε−
カプロラクトン６０〜９０重量％、及び、ポリ３−ヒド
ロキシ酪酸／３−ヒドロキシ吉草酸共重合体４０〜１０
重量％にするのが好ましい。ポリε−カプロラクトンが
６０重量％未満では、伸びの付与が不充分になる傾向が
あり、９０重量％を越えると、耐熱性が低下し、また、
フラットヤ−ンを織成、編組する際に織機、編機等の装
置に融着する傾向があり好ましくない。しかし、用途に
よっては、ポリε−カプロラクトンと３−ヒドロキシ酪
酸／３−ヒドロキシ吉草酸共重合体との配合比率が、こ
の範囲以外でも使用できる。この際、ポリε−カプロラ
クトンは押出し加工性の点から、メルトフロ−レ−トが
１．０〜８．０ｇ／１０ｍｉｎ（１９０℃、４４０ｐｓ
ｉ）が好ましい。また、３−ヒドロキシ酪酸／３−ヒド
ロキシ吉草酸共重合体は、押出し加工性の点から、３−
ヒドロキシ吉草酸共重合体の含有量が４〜１２％が好ま
しいが、これ等のことに特に制限はないThe composition of the present invention in which 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer is mixed with poly ε-caprolactone is poly ε-caprolactone.
Caprolactone 60 to 90% by weight and poly 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer 40 to 10
It is preferred that the content be% by weight. If the content of poly ε-caprolactone is less than 60% by weight, the elongation may not be sufficiently imparted, and if it exceeds 90% by weight, the heat resistance tends to be low.
When weaving or braiding the flat yarn, it tends to be fused to a device such as a loom or a knitting machine, which is not preferable. However, depending on the application, the compounding ratio of poly ε-caprolactone and the 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer can be used outside this range. At this time, poly-ε-caprolactone has a melt flow rate of 1.0 to 8.0 g / 10 min (190 ° C., 440 ps) from the viewpoint of extrusion processability.
i) is preferred. In addition, the 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer has a 3-
The content of hydroxyvaleric acid copolymer is preferably 4 to 12%, but these are not particularly limited.
【０００９】本発明に係るポリε−カプロラクトンに３
−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重合体を配
合する方法は、特に制限はなく、従来のポリプロピレン
等の混合に使用される適宜な方法で混合すればよい。例
えば、リボンブレンダ−、ヘンシェルミキサ−、タンブ
ラ−等の混合機、ニ−ダ−、バンバリ−ミキサ−、ロ−
ル等の混練機、一軸又は二軸押出機等を用いて溶融混練
し、押出してペレットにする方法でもよい。具体的に
は、ポリε−カプロラクトン６０〜９０重量％に、ポリ
３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重合体４
０〜１０重量％との混合物を、例えば、シリンダ−設定
温度１６０〜２００℃で、スクリュ−径３０ｍｍのニ軸
押出機により溶融混練しペレットを製造すればよいが、
特に制限はなく、ブレンドしたものでもよい。The poly ε-caprolactone according to the present invention has 3
The method of blending the -hydroxybutyric acid / 3-hydroxyvaleric acid copolymer is not particularly limited, and may be mixed by an appropriate method used for mixing conventional polypropylene and the like. For example, a mixer such as a ribbon blender, a Henschel mixer, a tumbler, a kneader, a Banbury mixer, a roll.
Alternatively, a method of melt-kneading using a kneader such as a single-screw extruder or a single-screw or twin-screw extruder and extruding into pellets may be used. Specifically, poly 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer 4 is added to poly (ε-caprolactone) 60 to 90% by weight.
A mixture with 0 to 10% by weight may be melt-kneaded with a twin-screw extruder having a screw diameter of 30 mm at a cylinder-set temperature of 160 to 200 ° C. to produce pellets,
There is no particular limitation, and a blended product may be used.
【００１０】本発明に係るポリカプロラクトン及び／又
は３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重合体
からなる組成物には、所望に応じて各種添加剤、充填
材、例えば、耐熱安定剤、酸化防止剤、光安定剤、帯電
防止剤、滑剤、顔料、炭酸カルシウム、硫酸バリウム、
水酸化マグネシウム、マイカ、タルク等を添加してもよ
い。滑剤としては、高級脂肪酸アマイド、例えば、ステ
アリン酸アマイド、エルカ酸アマイド、オレイン酸アマ
イド等をポリカプロラクトン及び／又は３−ヒドロキシ
酪酸／３−ヒドロキシ吉草酸共重合体１００重量部に対
して０．３〜０．８重量部添加すればよく、特に制限は
ない。更に、その他の生分解性樹脂等を必要に応じて配
合することもできる。The composition comprising the polycaprolactone and / or the 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer according to the present invention may optionally contain various additives, fillers, such as heat stabilizers and oxidants. Inhibitor, light stabilizer, antistatic agent, lubricant, pigment, calcium carbonate, barium sulfate,
Magnesium hydroxide, mica, talc, etc. may be added. As the lubricant, higher fatty acid amide, for example, stearic acid amide, erucic acid amide, oleic acid amide, etc., is added to polycaprolactone and / or 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer 100 parts by weight. It may be added in an amount of up to 0.8 parts by weight and is not particularly limited. Furthermore, other biodegradable resins and the like can be blended as necessary.
【００１１】本発明に係るポリカプロラクトン及び／又
は３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重合体
からなるフラットヤ−ンを成形するには、特に制限はな
く、適宜の方法によって製造すればよい。例えば、前記
のポリカプロラクトン及び／又は３−ヒドロキシ酪酸／
３−ヒドロキシ吉草酸共重合体を用いてシリンダ−設定
温度１６０〜２４０℃、ダイス温度１７０〜２４０℃の
Ｔダイ押出機或は環状押出機等を用いて、フラット状フ
ィルムもしくはシ−ト状に製膜する。次いで、該フィル
ム等を所定の幅、好ましくは４〜１０ｍｍ幅にスリット
した後、例えば、加熱ロ−ル温度３５〜６０℃のロ−ル
延伸機で１軸又は２軸（例えば、加熱ロ−ル延伸機で縦
延伸後、テンタ−で横延伸する逐次二軸延伸法）、好ま
しくは、１軸方向に、例えば、４〜８倍延伸してフラッ
トヤ−ンを製造する方法が例示できる。この際、フィル
ムもしくはシ−トの厚さは、２０〜２００μｍを例示で
きるが、特に制限はない。更に、得られたフラットヤ−
ンは、そのままでよいが、必要に応じて、合撚してもよ
く、特に制限はない。There are no particular restrictions on the molding of the flat yarn comprising the polycaprolactone and / or the 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer of the present invention, and any suitable method may be used. For example, polycaprolactone and / or 3-hydroxybutyric acid /
Using a 3-hydroxyvaleric acid copolymer, a cylinder-set temperature of 160 to 240 ° C., a die temperature of 170 to 240 ° C., a T-die extruder or a ring extruder, etc., to form a flat film or sheet. Form a film. Then, the film or the like is slit into a predetermined width, preferably 4 to 10 mm width, and then uniaxially or biaxially (for example, heating roll) by a roll stretching machine having a heating roll temperature of 35 to 60 ° C. (A sequential biaxial stretching method in which the film is longitudinally stretched by a roll stretching machine and then transversely stretched by a tenter), preferably a uniaxial direction, for example, 4 to 8 times, to produce a flat yarn. At this time, the thickness of the film or sheet can be exemplified as 20 to 200 μm, but it is not particularly limited. Furthermore, the obtained flat wire
The resin may be used as it is, but may be twisted if necessary and is not particularly limited.
【００１２】上記で得られたフラットヤ−ンを用いてネ
ット部材を製造する方法は、特に制限はなく、適宜な方
法、例えば、平織やラッセル編み等で織物または編物に
した後、ネットにすることができるが、これ以外の方法
でネットに成形してもよい。The method for producing a net member using the above-obtained flat yarn is not particularly limited, and an appropriate method such as plain weaving or Russell knitting into a woven or knitted material, and then forming a net However, the net may be formed by other methods.
【００１３】本発明に係るネット部材の用途としては、
例えば、護岸工事等で地盤を安定化するためのネット、
草木類の根等を絡ませて地盤等を安定化させるネット、
芝生の上に被せて芝生を繁殖させる芝生繁殖用ネット、
樹木移植用根巻ネット、食品包装用、その他各種の包装
用ネットとして好適に使用でき、特に制限はない。The use of the net member according to the present invention is as follows.
For example, a net for stabilizing the ground during revetment work,
A net that entangles the roots of plants and stabilizes the ground,
A lawn breeding net that covers the lawn and breeds the lawn,
There is no particular limitation as it can be suitably used as a net roll for tree transplantation, a net for food packaging and various other packaging.
【００１４】[0014]
【作用】ポリカプロラクトン及び／又は３−ヒドロキシ
酪酸／３−ヒドロキシ吉草酸共重合体、または、ポリカ
プロラクトン、６０〜９０重量％及びポリ３−ヒドロキ
シ酪酸／３−ヒドロキシ吉草酸共重合体、４０〜１０重
量％を配合してなる組成物を、Ｔダイ押出機もしくはチ
ュ−ブ状押出機等に供給する。次いで、シリンダ−設定
温度１６０〜２４０℃、ダイス温度１７０〜２４０℃に
加熱した押出機で溶融混練押出し、冷却してフィルム又
はシ−トに製膜する。引き続いて、該フィルム（シ−ト
を含む）が、所定幅、例えば、４〜１０ｍｍにスリット
された後、例えば、延伸温度３５〜６０℃のロ−ル延伸
機で１軸或は２軸（加熱ロ−ルで縦延伸後テンタ−で横
延伸），好ましくは、縦方向に、例えば、４〜８倍１軸
延伸され、厚さが、特に制限はないが、２０〜２００μ
ｍのフラットヤ−ンに成形される。このフラットヤ−ン
は、このままでもよいが、必要に応じて、合撚して撚糸
として、例えば、平織、ラッセル編み等で織成又は編組
され生分解性を有するネット部材に製造してもよく、特
に制限はない。該ネット部材は、例えば、護岸工事等で
の地盤の安定化用、草木類の根等を絡ませる地盤等の安
定化用、芝生の上に被せて芝生を繁殖させる芝生繁殖
用、樹木移植用根巻用等のネット、及び、食品包装を初
めとして各種物品等の包装用ネット等に好適に使用でき
る。しかも、これ等のネット部材は、その使用目的が完
了した後、回収せずにそのまま放置或は廃棄物として、
土中や水中に廃棄しても、土中、水中等の微生物などに
よって完全に生分解される。したがって、本発明に係る
生分解性ネット部材は環境汚染の問題を減少できる作用
を有している。[Function] Polycaprolactone and / or 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer, or polycaprolactone, 60 to 90% by weight and poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer, 40 to The composition containing 10% by weight is supplied to a T-die extruder or a tube-shaped extruder. Then, the mixture is melt-kneaded and extruded by an extruder heated to a cylinder-set temperature of 160 to 240 ° C. and a die temperature of 170 to 240 ° C., cooled and formed into a film or sheet. Subsequently, the film (including the sheet) is slit into a predetermined width, for example, 4 to 10 mm, and then uniaxially or biaxially (for example, in a roll drawing machine at a drawing temperature of 35 to 60 ° C.). (Longitudinal stretching with heating roll and transverse stretching with tenter), preferably uniaxially stretched in the longitudinal direction, for example, 4 to 8 times, and the thickness is not particularly limited, but is 20 to 200 μm.
m is molded into a flat yarn. This flat yarn may be left as it is, but if necessary, it may be manufactured as a biodegradable net member which is woven or braided as a twisted yarn by twisting, for example, plain weave or Russell knitting, There is no particular limitation. The net member is, for example, for stabilizing the ground during revetment work, for stabilizing the ground where the roots of vegetation are entangled, for propagating the lawn to cover the lawn for propagating the lawn, and for transplanting trees. It can be suitably used for nets for neck rolls, nets for packaging various articles including food packaging, and the like. Moreover, after the purpose of use of these net members is completed, they are left as they are without collection or as waste.
Even if it is discarded in the soil or water, it is completely biodegraded by microorganisms in the soil or water. Therefore, the biodegradable net member according to the present invention has an effect of reducing the problem of environmental pollution.
【００１５】[0015]
【実施例】以下、本発明を実施例により詳細に説明す
る。但し、本発明は、下記実施例により制限されるもの
でない。EXAMPLES The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the following examples.
【００１６】実施例１ 密度１．１４５ｇ／ｃｍ3 （２３℃），メルトインデッ
クス（ＭＩ）４ｇ／１０ｍｉｎ（１９０℃，４４０ｐｓ
ｉ），融点６０℃，数平均分子量（Ｍ）８０，０００の
ポリε−カプロラクトンをＴダイ押出機に供給し、シリ
ンダ−設定温度１７０〜２３０℃、ダイス温度２３０℃
で溶融混練押出し、冷却して、厚さ１５０μｍのシ−ト
を製造した。次いで、該シ−トを４ｍｍ幅にスリットし
た後、ロ−ル温度４５℃のロ−ル延伸機で縦方向（押出
方向）に５倍延伸して、厚さ３０μｍのフラットヤ−ン
を得た。得られたフラットヤ−ンの強度が、４ｇ／ｄ、
伸度が１００であった。該フラットヤ−ンを用いて、無
結節編機で、無結節編みのネットに成形した。該ネット
は土壌中に放置されると４ヶ月で６０％生分解され、未
分解部分のネットの強伸度は初期値（強度４ｇ／ｄ、伸
度１００％）の２０％以下に低下し生分解性が優れたも
のである。Example 1 Density 1.145 g / cm 3 (23 ° C.), melt index (MI) 4 g / 10 min (190 ° C., 440 ps)
i), melting point 60 ° C., poly-ε-caprolactone having a number average molecular weight (M) of 80,000 is supplied to a T-die extruder, cylinder-set temperature 170-230 ° C., die temperature 230 ° C.
Was melt-kneaded and extruded, and cooled to manufacture a sheet having a thickness of 150 μm. Then, the sheet was slit into a width of 4 mm and then stretched 5 times in the machine direction (extrusion direction) with a roll stretching machine having a roll temperature of 45 ° C. to obtain a flat yarn having a thickness of 30 μm. . The strength of the obtained flat yarn is 4 g / d,
The elongation was 100. Using the flat yarn, a knotless knitting machine was used to form a knotless net. When the net was left in soil, it was biodegraded by 60% in 4 months, and the strength and elongation of the undecomposed part of the net decreased to 20% or less of the initial value (strength 4 g / d, elongation 100%). It has excellent degradability.
【００１７】実施例２ 密度１．２５ｇ／ｃｍ3 （２３℃），メルトフロ−イン
デ−ックス（ＭＦＩ、ＡＳＴＭ−１２３８−９０６／
２．１６ｋｇ Ｉｏａｄ １９０℃）１２ｇ／１０ｍｉ
ｎ，融点１４４℃のポリ３−ヒドロキシ酪酸／３−ヒド
ロキシ吉草酸共重合体をＴダイ押出機に供給し、シリン
ダ−設定温度１６０〜１８０℃、ダイス温度１７０℃で
溶融混練押出した後、冷却して、厚さ１５０μｍのシ−
トを製造した。次いで、該シ−トを４ｍｍ幅にスリット
した後、ロ−ル温度６０℃のロ−ル延伸機で縦方向（押
出方向）に、５倍延伸して、厚さ３０μｍのフラットヤ
−ンを得た。得られたフラットヤ−ンの強度は４ｇ／
ｄ、伸度が２０％であった。該フラットヤ−ンを用い
て、無結節編機で、無結節編みのネットに成形した。該
ネットは土壌中に放置されると４ヶ月で９０％生分解さ
れ、未分解部分のネットの強伸度は初期値（強度４ｇ／
ｄ、伸度２０％）の１０％以下に低下し生分解性が優れ
たものである。Example 2 Density 1.25 g / cm 3 (23 ° C.), melt flow index (MFI, ASTM-1238-906 /
2.16kg Ioad 190 ° C) 12g / 10mi
n, a poly (3-hydroxybutyric acid / 3-hydroxyvaleric acid) copolymer having a melting point of 144 ° C. is supplied to a T-die extruder, melt-kneaded and extruded at a cylinder-set temperature of 160 to 180 ° C. and a die temperature of 170 ° C., and then cooled. And a sheet with a thickness of 150 μm
Manufactured. Then, the sheet was slit into a width of 4 mm and then stretched 5 times in the machine direction (extrusion direction) with a roll stretching machine having a roll temperature of 60 ° C. to obtain a flat yarn having a thickness of 30 μm. It was The strength of the obtained flat yarn is 4 g /
d, the elongation was 20%. Using the flat yarn, a knotless knitting machine was used to form a knotless net. When the net was left in the soil, 90% was biodegraded in 4 months, and the unstretched part of the net had an initial elongation (strength 4 g / strength).
d, elongation 20%), and the biodegradability is excellent.
【００１８】実施例３ 実施例１で用いたポリε−カプロラクトン８０重量％
に、実施例２で用いたポリ３−ヒドロキシ酪酸／３−ヒ
ドロキシ吉草酸共重合体２０重量％とを混合し、温度１
８０℃で１０分間溶融混練した組成物を調製した。上記
で調製した組成物をＴダイ押出機に供給し、シリンダ−
設定温度１６０〜１８０℃、ダイス温度１８０℃で溶融
混練押出し後、冷却して、厚さ１５０μｍのシ−トを製
造した。次いで、該シ−トを４ｍｍ幅にスリットした
後、ロ−ル温度４５℃のロ−ル延伸機で縦方向（押出方
向）に５倍延伸して、厚さ３０μｍのフラットヤ−ンを
得た。得られたフラットヤ−ンの強度が４ｇ／ｄ、伸度
が８０％であった。該撚フラットヤ−ンを用いてネット
を成形した。該ネットは土壌中に放置されると４ヶ月で
７０％生分解され、未分解部分のネネットの強伸度は初
期値（強度４ｇ／ｄ、伸度８０％）の２０％以下に低下
し生分解性が優れたものである。Example 3 80% by weight of poly ε-caprolactone used in Example 1
Was mixed with 20% by weight of the poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer used in Example 2, and the temperature was adjusted to 1
A composition was prepared by melt-kneading at 80 ° C. for 10 minutes. The composition prepared above was fed to a T-die extruder and placed in a cylinder-
After melt-kneading and extruding at a set temperature of 160 to 180 ° C. and a die temperature of 180 ° C., the sheet was cooled to produce a sheet having a thickness of 150 μm. Then, the sheet was slit into a width of 4 mm and then stretched 5 times in the machine direction (extrusion direction) with a roll stretching machine having a roll temperature of 45 ° C. to obtain a flat yarn having a thickness of 30 μm. . The obtained flat yarn had a strength of 4 g / d and an elongation of 80%. A net was formed using the twisted flat yarn. When the net was left in the soil, it was biodegraded by 70% in 4 months, and the strength and elongation of the undegraded part of the net was reduced to 20% or less of the initial value (strength 4 g / d, elongation 80%), and It has excellent degradability.
【００１９】実施例４ 実施例１で用いたポリε−カプロラクトン６０重量％
に、実施例２で用いたポリ３−ヒドロキシ酪酸／３−ヒ
ドロキシ吉草酸共重合体４０重量％とを混合し、温度１
８０℃で１０分間溶融混練して調製した組成物を用いる
以外は、実施例３と同様にして織物を得た。該ネットは
土壌中に放置されると４ヶ月で８０％生分解され、未分
解部分のネットの強伸度は初期値（強度４ｇ／ｄ、伸度
４０％）の１５％以下に低下し生分解性が優れたもので
ある。Example 4 60% by weight of poly ε-caprolactone used in Example 1
Was mixed with 40% by weight of the poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer used in Example 2, and the temperature was adjusted to 1
A woven fabric was obtained in the same manner as in Example 3 except that the composition prepared by melt-kneading at 80 ° C. for 10 minutes was used. When the net was left in soil, it was biodegraded by 80% in 4 months, and the undecomposed portion of the net had a low elongation of 15% or less of the initial value (strength 4 g / d, elongation 40%). It has excellent degradability.
【００２０】実施例５ 実施例１で用いたポリε−カプロラクトン９０重量％
に、実施例２で用いたポリ３−ヒドロキシ酪酸／３−ヒ
ドロキシ吉草酸共重合体１０重量％とを混合し、温度１
８０℃で１０分間溶融混練して調製した組成物を用いる
以外は、実施例３と同様にしてネットを得た。該ネット
は土壌中に放置されると４ヶ月で６５％生分解され、未
分解部分のネットの強伸度は初期値（強度４ｇ／ｄ、伸
度９０％）の２０％以下に低下し生分解性が優れたもの
である。Example 5 90% by weight of poly ε-caprolactone used in Example 1
Was mixed with 10% by weight of the poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer used in Example 2, and the temperature was adjusted to 1
A net was obtained in the same manner as in Example 3 except that the composition prepared by melt-kneading at 80 ° C. for 10 minutes was used. When left in soil, the net was biodegraded by 65% in 4 months, and the strength and elongation of the undecomposed portion of the net decreased to 20% or less of the initial value (strength 4 g / d, elongation 90%). It has excellent degradability.
【００２１】[0021]
【発明の効果】本発明に係るフラットヤ−ンから製造さ
れるネット部材は、例えば、護岸工事での地盤安定化用
ネット、草木類の殖生用ネット及び芝生繁殖用ネット等
に好適に使用できる。しかも、本発明に係るネット部材
からなるネット類は、その使用目的が終了し終えた後、
自然界に放置したままでも、自然界の微生物により生分
解され自然界に還元できる。また、該ネット部材が食品
をはじめとして各種の商品及び機械類製品の包装用資材
としても好適に使用でき、しかも廃棄処理が容易であ
り、使用目的が完了後、廃棄物として土中、水中等に廃
棄した場合でも、微生物により完全に生分解されるので
環境汚染の心配がない。更に、該ネット部材が、廃棄物
として焼却処理される場合でも、燃焼カロリ−が小さい
ので、焼却炉を痛めることが少ない傾向にある。よっ
て、該ネット部材は、護岸工事等の地盤安定化用ネッ
ト、各種食品、商品機械部品等の包装資材以外でも多く
の用途が期待できる。INDUSTRIAL APPLICABILITY The net member manufactured from the flat yarn according to the present invention can be suitably used for, for example, a ground stabilizing net, a vegetative net for vegetation and a turf breeding net for revetment work. Moreover, the nets made of the net member according to the present invention, after the end of the purpose of use,
Even if it is left in the natural world, it can be biodegraded by microorganisms in the natural world and returned to the natural world. Further, the net member can be suitably used as a packaging material for various products such as foods and machinery products, and further, it is easy to dispose of it, and after the purpose of use is completed, as waste, in soil, underwater, etc. Even when it is discarded, it is completely biodegraded by microorganisms, so there is no concern about environmental pollution. Further, even when the net member is incinerated as a waste, since the combustion calories are small, the incinerator tends to be less likely to be damaged. Therefore, the net member can be expected to be used for many purposes in addition to the ground stabilization net for revetment work, various foods, packaging materials such as machine parts for merchandise.
Claims (2)
ロキシ酪酸／３−ヒドロキシ吉草酸共重合体からなるフ
ラットヤ−ンを用いて織成又は編組されることを特徴と
する生分解性ネット部材。1. A biodegradable net member which is woven or braided using a flat yarn made of polycaprolactone and / or a 3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer.
びポリ３−ヒドロキシ酪酸／３−ヒドロキシ吉草酸共重
合体４０〜１０重量％を配合してなる組成物から製造さ
れる請求項１に記載の生分解性ネット部材。2. The raw material according to claim 1, which is produced from a composition comprising 60 to 90% by weight of polycaprolactone and 40 to 10% by weight of a poly-3-hydroxybutyric acid / 3-hydroxyvaleric acid copolymer. Degradable net material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7046328A JPH08218246A (en) | 1995-02-09 | 1995-02-09 | Biodegradable net member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7046328A JPH08218246A (en) | 1995-02-09 | 1995-02-09 | Biodegradable net member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08218246A true JPH08218246A (en) | 1996-08-27 |
Family
ID=12744088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7046328A Pending JPH08218246A (en) | 1995-02-09 | 1995-02-09 | Biodegradable net member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08218246A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1027384A2 (en) | 1997-10-31 | 2000-08-16 | The Monsanto Company | Polymer blends containing polyhydroxyalkanoates and compositions with good retention of elongation |
| JP2001340137A (en) * | 2000-05-30 | 2001-12-11 | Gc Dental Products Corp | Interdental brush and sleeve for interdental brush |
| JP2002220766A (en) * | 2001-01-18 | 2002-08-09 | Chisso Corp | Thermoplastic resin net |
| JP2017186811A (en) * | 2016-04-07 | 2017-10-12 | 国立大学法人 東京大学 | Sand gravel solidification body forming method and land area preservation method |
-
1995
- 1995-02-09 JP JP7046328A patent/JPH08218246A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1027384A2 (en) | 1997-10-31 | 2000-08-16 | The Monsanto Company | Polymer blends containing polyhydroxyalkanoates and compositions with good retention of elongation |
| JP2001340137A (en) * | 2000-05-30 | 2001-12-11 | Gc Dental Products Corp | Interdental brush and sleeve for interdental brush |
| JP2002220766A (en) * | 2001-01-18 | 2002-08-09 | Chisso Corp | Thermoplastic resin net |
| JP2017186811A (en) * | 2016-04-07 | 2017-10-12 | 国立大学法人 東京大学 | Sand gravel solidification body forming method and land area preservation method |
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