JP3336091B2 - Degradable synthetic resin sheet - Google Patents
Degradable synthetic resin sheetInfo
- Publication number
- JP3336091B2 JP3336091B2 JP26479393A JP26479393A JP3336091B2 JP 3336091 B2 JP3336091 B2 JP 3336091B2 JP 26479393 A JP26479393 A JP 26479393A JP 26479393 A JP26479393 A JP 26479393A JP 3336091 B2 JP3336091 B2 JP 3336091B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- resin
- polyolefin
- weight
- flat yarn
- 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
- Protection Of Plants (AREA)
- Laminated Bodies (AREA)
- Biological Depolymerization Polymers (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】本発明は、農業、土木、建築作業
等で用いられる養生シートや、資材を覆ったり、レジャ
ー等に使用される各種のシートにおいて、土、生ごみ、
あるいは堆肥のような分解媒体中あるいは空気中で、速
やかに崩壊及び分解する合成樹脂シートに関するもので
ある。BACKGROUND OF THE INVENTION The present invention relates to a curing sheet used in agriculture, civil engineering, construction work, etc., and various sheets used for covering materials, leisure, etc.
Alternatively, the present invention relates to a synthetic resin sheet which rapidly disintegrates and decomposes in a decomposition medium such as compost or in air.
【0002】[0002]
【従来の技術】従来、農業、土木、建築作業等に使用さ
れる養生シートは、ポリオレフィン系合成樹脂のフィル
ムを細幅にスリットして延伸し、これをフラットヤーン
として密に並べて織成し、この織成した織布の片面又は
両面に同素材の樹脂をコーティングしたものである。2. Description of the Related Art Conventionally, a curing sheet used for agriculture, civil engineering, construction work, or the like is formed by slitting a polyolefin-based synthetic resin film into narrow widths, stretching them, arranging them densely as flat yarns, and weaving them. One or both sides of a woven fabric coated with a resin of the same material.
【0003】ところで、近来、合成樹脂の使用量が増大
するに伴い、合成樹脂廃棄物がもたらす環境汚染問題が
急速に高まり、その処理方法が問題となっている。合成
樹脂廃棄物は従来焼却及び埋め立て処分を主としてきた
が、燃焼ガスによる環境悪化や埋立地の減少、散乱によ
る自然破壊等の問題に加え、再資源化に対しての社会的
気運、住民運動の盛上がり、行政の介入等が生じてきて
いる。こうした背景の中、合成樹脂廃棄物を土中に埋め
たり投棄した際に土壌中の微生物や光によって崩壊及び
分解を生じさせる合成樹脂の研究がなされ、既に澱粉を
配合した合成樹脂等が提案され実用化されている(例え
ば、特開平4-173868号,特開平5-65420号公報)。In recent years, as the amount of synthetic resin used has increased, the problem of environmental pollution caused by synthetic resin waste has rapidly increased, and its treatment method has become a problem. Conventionally, synthetic resin waste has been mainly incinerated and landfilled. However, in addition to problems such as deterioration of the environment due to combustion gas, reduction of landfills, and natural destruction due to scattering, social sentiment for recycling and public movement Rising, administrative intervention is occurring. Against this background, studies have been made on synthetic resins that can be destroyed and decomposed by microorganisms and light in the soil when synthetic resin wastes are buried or dumped in the soil, and synthetic resins that have already been blended with starch have been proposed. It has been put to practical use (for example, JP-A-4-173868, JP-A-5-65420).
【0004】[0004]
【発明が解決しようとする課題】前述の分解性合成樹脂
は、押出成形、射出成形、カレンダー成形、吹込成形、
回転成形等の種々の成形方法により、各種フィルムや容
器の形態に成形されているのであるが、一般に低温で成
形可能なものに限られる。これは、分解性有機質が250
℃を越える加温によりそれ自体が分解や変質して合成樹
脂の分解を誘発し難くなるためと、ガス発生による発泡
現象や目ヤニの発生など合成樹脂自身の成形加工性が劣
るものとなるからである。例えば養生シートのラミネー
ト工程のように溶融押出温度が280〜320℃ともなると充
分な分解性効果が発現しないものとなり、加工性も著し
く低下したものとなる。The above-mentioned decomposable synthetic resins include extrusion molding, injection molding, calender molding, blow molding,
It is molded into various films and containers by various molding methods such as rotational molding, but is generally limited to those that can be molded at low temperatures. It has 250 degradable organics
Heating above ℃ degrades or degrades itself, which makes it difficult to induce the decomposition of the synthetic resin, and the molding processability of the synthetic resin itself becomes inferior, such as foaming phenomenon due to gas generation and generation of eye repellent. It is. For example, if the melt extrusion temperature is as high as 280 to 320 ° C. as in the curing sheet laminating step, a sufficient decomposability effect will not be exhibited, and workability will be significantly reduced.
【0005】[0005]
【課題を解決するための手段】そこで、本発明は上記の
分解性合成樹脂の難点をふまえ、使用目的を終え放置す
ると崩壊し破片化さらには長期間においては分解され土
中に還元される合成樹脂シートの製造方法に検討を加え
たのである。その結果、ポリオレフィン系合成樹脂に澱
粉、変性澱粉等の分解性有機質1〜15重量%を加えて18
0〜250℃、好ましくは200〜230℃の温度で溶融して押出
し製造されるフラットヤーンを経緯糸に用いて織成した
織布の少なくとも一面に、再生樹脂原料を50重量%以上
含む樹脂被覆層を形成することにより解決したのであ
る。SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned drawbacks of the degradable synthetic resin. The synthetic resin is decomposed and fragmented when left for the purpose of use, and is decomposed and reduced to soil in a long period of time. Investigating the method of manufacturing the resin sheet. As a result, 1 to 15% by weight of degradable organic substances such as starch and modified starch are added to the polyolefin-based synthetic resin to obtain 18%.
A resin coating layer containing 50% by weight or more of a recycled resin material on at least one surface of a woven fabric woven using a flat yarn which is melted at a temperature of 0 to 250 ° C., preferably 200 to 230 ° C. and extruded and manufactured using warp yarns. The problem was solved by forming
【0006】本発明で用いられるポリオレフィン系合成
樹脂とは、エチレン、プロピレン、1−ブテン、4−メ
チル−1−ペンテンなどのα−オレフィンの単独重合体
もしくは相互共重合体またはこれらのα−オレフィンと
他のコモノマーの共重合体からなるもので、フラットヤ
ーンの成形性、ラミネートの加工性、養生シートとして
充分な強力を有し、軽量で柔軟性があり、取扱いが容易
な点などから選択されるものである。The polyolefin synthetic resin used in the present invention is a homopolymer or a mutual copolymer of α-olefins such as ethylene, propylene, 1-butene and 4-methyl-1-pentene, or these α-olefins. And other comonomers, and is selected from the viewpoints of flat yarn formability, laminate processability, sufficient strength as a curing sheet, light weight, flexibility, and easy handling. Things.
【0007】織布を構成するフラットヤーンに分解性を
付与する目的で前述のポリオレフィン系合成樹脂に添加
する分解性有機質とは、微生物が好んで分解する性質の
有機質であって、例えば澱粉(穀物粒澱粉、根作物澱
粉、及びそれらの変性澱粉)、植物乾燥微細粉等であっ
て、これらへ更に自然環境下でそれ自身が酸化分解して
合成樹脂の分解に寄与する不飽和脂肪酸等の添加物を加
えたものも含まれる。The decomposable organic substance to be added to the above-mentioned polyolefin-based synthetic resin for the purpose of imparting decomposability to the flat yarn constituting the woven fabric is an organic substance that is preferably decomposed by microorganisms and is, for example, starch (cereal). Granular starch, root crop starch, and their modified starches), plant dry fine powder, and the like, to which unsaturated fatty acids and the like, which themselves are oxidatively decomposed in a natural environment and contribute to the decomposition of synthetic resins, are added. Includes things that have been added.
【0008】また、合成樹脂に対する澱粉、変性澱粉等
の分解性有機質添加量は1〜15重量%が好ましい。1%
より添加量が少ないと分解までに崩壊及び分解の効果は
極めて低いものであり本目的に適合しないし、15%より
添加量が多いとフラットヤーンの成形性及び養生シート
基材として初期の強度が問題となる。The amount of decomposable organic substances such as starch and modified starch added to the synthetic resin is preferably 1 to 15% by weight. 1%
If the addition amount is less, the effect of disintegration and decomposition by decomposition is extremely low and it is not suitable for this purpose.If the addition amount is more than 15%, the moldability of the flat yarn and the initial strength as a cured sheet base material are reduced. It becomes a problem.
【0009】このように配合したポリオレフィン系合成
樹脂と分解性有機質を押出機にてTダイ法又はインフレ
ーション法等にて無定形のフィルムを製膜し、冷却して
約10〜20mm幅にスリットした後、縦方向に延伸配向さ
せ、次いで熱処理することでフラットヤーンを得るので
あるが、押出工程での溶融温度は250℃以下で行う必要
がある。これ以上の高温においては、分解性有機質自身
が分解や変質を起こし、微生物による合成樹脂分解を誘
発し難くなるためであると同時に、成形加工性が悪化す
るからである。また、180℃以下になると、一般に溶融
粘度が高くなり、製膜性に劣ることになる。好ましい温
度は200〜230℃である。The polyolefin-based synthetic resin and the decomposable organic compound thus compounded are formed into an amorphous film by an extruder by a T-die method or an inflation method, cooled, and slit into a width of about 10 to 20 mm. Thereafter, a flat yarn is obtained by stretching and orienting in the longitudinal direction and then heat-treating, but the melting temperature in the extrusion step needs to be 250 ° C. or lower. If the temperature is higher than this, the decomposable organic substance itself is decomposed or deteriorated, and it is difficult to induce the decomposition of the synthetic resin by microorganisms, and at the same time, the moldability deteriorates. On the other hand, when the temperature is 180 ° C. or lower, the melt viscosity generally increases, and the film-forming property is inferior. Preferred temperatures are between 200 and 230 ° C.
【0010】こうして得られる分解性フラットヤーンを
経緯糸に用いて、スルザー織機等で織成し織布としたも
のに、防水性及び強度を付与するため樹脂ラミネートを
施すのであるが、ラミネート工程での樹脂溶融押出温度
は被覆の均一性や高速加工性から280〜320℃程度にする
必要があり、分解性有機質の添加による分解性効果は減
少するものとなる。そこで、本発明では再生樹脂原料を
50重量%以上含む樹脂被覆層を形成することで分解性を
さらに加速するのである。更に、必要によりフラットヤ
ーンに用いる合成樹脂に再生樹脂原料を30重量%以上加
えると分解性を高めることができる。The decomposable flat yarn thus obtained is used as a warp yarn and woven with a sulzer loom or the like to give a woven fabric, which is subjected to resin lamination in order to impart waterproofness and strength. The melt extrusion temperature needs to be about 280 to 320 ° C. from the viewpoint of uniformity of coating and high-speed processability, and the decomposability effect due to the addition of decomposable organic substances is reduced. Therefore, in the present invention, the recycled resin raw material is used.
By forming a resin coating layer containing 50% by weight or more, the decomposability is further accelerated. Further, if necessary, 30% by weight or more of the recycled resin raw material is added to the synthetic resin used for the flat yarn to improve the decomposability.
【0011】ここに言う再生樹脂原料とは、数回の高温
での熱履歴を経た樹脂原料を言うのであって、例えば使
用済みの樹脂成形品や樹脂製品の製造、加工或いは組立
工程からでるスクラップやオフグレード品等を回収し、
破砕後洗浄し、乾燥して、スクリーンベント式押出機を
通し、ペレタイザーで再生ペレットとしたもので、単独
又はバージンレジンを混合したものである。従来は異種
樹脂の混合により品質の低いものであったが、再資源化
を目的にプラスチック廃棄物の種類別の分別回収が指導
され比較的品質の均一な再生樹脂原料もあり、本発明に
おいても好ましくは主原料として同種或いは同類のポリ
オレフィン系合成樹脂を用いたものである。The term "recycled resin raw material" as used herein means a resin raw material that has undergone several thermal histories at a high temperature, and includes, for example, scrap from the production, processing or assembly process of a used resin molded product or resin product And off-grade products,
After being crushed, washed, dried, passed through a screen vent type extruder and made into regenerated pellets with a pelletizer, which is a single or mixed virgin resin. Conventionally, the quality was low due to the mixing of different kinds of resins.However, for the purpose of recycling, separation and recovery of plastic waste by type has been instructed, and there is also a recycled resin raw material of relatively uniform quality. Preferably, the same or similar polyolefin-based synthetic resin is used as the main raw material.
【0012】該再生樹脂原料は、数回の加熱冷却を経る
ことでポリオレフィンの主鎖中にカルボニル基等の酸化
活性点を発現したものとなる。この酸化活性点は、本来
疎水性である低密度ポリエチレン等に親水性をもたせ、
微生物活動に必要な水分の吸着をはかると共に、微生物
攻撃(酸素反応)による主鎖切断を容易にさせるのであ
る。つまり、再生樹脂原料は、樹脂組成物中に酸化促進
剤として酸化油剤を添加するのと同様の効果をその製造
工程中において既に付加されたものとなっている。ここ
で樹脂被覆層中の再生樹脂原料の配合量は、50重量%以
上でないと微生物による分解効果は期待できないものと
なる。再生の程度が良好で樹脂の物理的性質の劣化が少
ない場合は再生樹脂100%の使用も可能である。[0012] The regenerated resin raw material becomes one in which an oxidative active site such as a carbonyl group is developed in the main chain of the polyolefin after several times of heating and cooling. This oxidation active site imparts hydrophilicity to low-density polyethylene, which is originally hydrophobic,
It not only absorbs water necessary for microbial activity, but also facilitates main chain breakage by microbial attack (oxygen reaction). In other words, the recycled resin raw material has already been added during the manufacturing process to the same effect as when an oxidizing oil agent is added as an oxidation accelerator to the resin composition. Here, unless the amount of the recycled resin material in the resin coating layer is 50% by weight or more, the effect of decomposition by microorganisms cannot be expected. When the degree of regeneration is good and the deterioration of the physical properties of the resin is small, 100% of the recycled resin can be used.
【0013】また、再生樹脂原料には金属塩を添加すれ
ば更に分解性が向上する。金属塩としては、無機酸の金
属塩や高級脂肪酸の金属塩等が例示される。無機酸とし
ては硫酸、塩酸、炭酸等、高級脂肪酸としては、炭素数
10〜30の飽和脂肪酸や不飽和脂肪酸、金属としては鉄、
アルミニウム等が好ましい。これら金属塩の添加量は0.
1〜30重量%である。金属塩の添加量が0.1重量%以上で
あれば、増量するほど分解性は増大するが、30重量%を
越えると分散不良による成形性の悪化と物性低下が著し
く大きくなり実用的でない。Further, if a metal salt is added to the recycled resin raw material, the decomposability is further improved. Examples of the metal salt include a metal salt of an inorganic acid and a metal salt of a higher fatty acid. Sulfuric acid, hydrochloric acid, carbonic acid, etc. as inorganic acids, carbon number as higher fatty acids
10-30 saturated or unsaturated fatty acids, iron as the metal,
Aluminum and the like are preferred. The addition amount of these metal salts is 0.
It is 1 to 30% by weight. If the addition amount of the metal salt is 0.1% by weight or more, the degradability increases as the amount increases, but if it exceeds 30% by weight, the deterioration of the moldability and the deterioration of the physical properties due to poor dispersion become extremely large, which is not practical.
【0014】本発明においては、本発明の要旨を逸脱し
ない範囲において、可塑剤、滑剤、紫外線吸収剤、発泡
剤、架橋剤、帯電防止剤、難燃剤、着色剤、充填剤等の
添加剤を配合することができる。In the present invention, additives such as a plasticizer, a lubricant, an ultraviolet absorber, a foaming agent, a cross-linking agent, an antistatic agent, a flame retardant, a colorant, and a filler are used without departing from the gist of the present invention. Can be blended.
【0015】[0015]
【作用】以上、本発明の構成を作用と共に説明したが、
ここで作用の要約をすると、次のようになる。ポリオレ
フィン系合成樹脂は養生シートとしての十分な強力を有
し、成形性、加工性、柔軟性に優れ、分解性有機質を1
〜15%の混入で初期強度の低下なしに適当な分解期限が
確保できる。特に、成形時の溶融・押出条件の250℃以
下において、分解性有機質の変質なしに混入可能で、こ
れにより、初期の目的が達成できる。The operation of the present invention has been described with the operation.
Here is a summary of the operation. Polyolefin-based synthetic resin has sufficient strength as a curing sheet, is excellent in moldability, processability, flexibility, and contains one decomposable organic material.
An appropriate decomposition time limit can be secured without lowering the initial strength by mixing up to 15%. In particular, at a melting / extrusion condition of 250 ° C. or less at the time of molding, the compound can be mixed without deterioration of the decomposable organic substance, thereby achieving the initial purpose.
【0016】本発明の養生シートはフラットヤーンクロ
スとその少なくとも片面の樹脂被覆層とからなるが、そ
の樹脂に再生樹脂原料を50%以上含有させることにより
分解性を高め、かつあまり物性の低下のない状態とする
ことができる。そして必要により、フラットヤーンクロ
スや樹脂被覆層に再生樹脂や金属塩を混入して、全体の
光や微生物による分解性が調節できる。The curing sheet of the present invention comprises a flat yarn cloth and a resin coating layer on at least one surface thereof. By incorporating 50% or more of a recycled resin raw material into the resin, the degradability is increased, and the physical properties are not significantly reduced. There can be no state. If necessary, a regenerated resin or a metal salt may be mixed into the flat yarn cloth or the resin coating layer to control the overall decomposability by light or microorganisms.
【0017】[0017]
【実施例】以下、実施例にて説明を加える。[Embodiment] Hereinafter, an embodiment will be described.
【0018】合成樹脂に高密度ポリエチレン(HDPE,MI=
0.8g/10min.、密度=0.962g/cm3)、ポリエチレンを主成
分とする再生樹脂、分解性有機質として米澱粉(粒子径
約1μm)、金属塩として硫酸アルミニウムをそれぞれ
選び、所定量配合したものを原料として、インフレーシ
ョン法で溶融温度230℃で円形ダイスから押し出しフィ
ルムを製膜し、細断してテープ状とした後、熱板接触延
伸方式で延伸温度115℃、アニーリング温度120℃、延伸
倍率4.8倍で縦一軸延伸して繊度1,000drのフラットヤー
ンとした。このフラットヤーンを経緯糸に用いて、スル
ーザー織機にて織成密度10×8本/インチの平織り織布を
得た。High density polyethylene (HDPE, MI =
0.8 g / 10 min., Density = 0.962 g / cm 3 ), a recycled resin mainly composed of polyethylene, rice starch (particle diameter: about 1 μm) as a decomposable organic substance, and aluminum sulfate as a metal salt were mixed and mixed in predetermined amounts. Using the material as a raw material, a film is extruded from a circular die at a melting temperature of 230 ° C by the inflation method, cut into tapes, and stretched at 115 ° C, annealing temperature of 120 ° C by hot plate contact stretching method. It was stretched uniaxially at a magnification of 4.8 times to obtain a flat yarn with a fineness of 1,000 dr. Using this flat yarn as the warp yarn, a plain weaving fabric having a weaving density of 10 × 8 / inch was obtained with a sluser loom.
【0019】この平織り織布に樹脂被覆層を形成するに
あたり、合成樹脂に低密度ポリエチレン(LDPE,MI=8.0g
/10min.、密度=0.917g/cm3)、ポリエチレンを主成分と
する再生樹脂、金属塩として硫酸アルミニウムをそれぞ
れ選び、所定量配合したものを原料として、溶融押出法
により溶融温度280℃でクロスシートの表裏両面に各々3
0μm厚みのラミネート被覆を施し、本発明の分解性合成
樹脂シートとした。In forming the resin coating layer on the plain woven cloth, low density polyethylene (LDPE, MI = 8.0 g) was used as the synthetic resin.
/ 10 min., Density = 0.917 g / cm 3 ), a recycled resin mainly composed of polyethylene, and aluminum sulfate as a metal salt. 3 on each side of the sheet
A laminate coating having a thickness of 0 μm was applied to obtain a decomposable synthetic resin sheet of the present invention.
【0020】ここで、フラットヤーン及びラミネートに
使用される再生樹脂とは、以下のように製造されたもの
である。成形品、フィルム、シート、紐状物等のプラス
チック廃棄物のうち、ポリエチレンを主成分とするもの
を選別し、公知技術で破砕、洗浄、乾燥工程を経た後、
スクリーンベント式押出機で溶融温度260℃でノズルよ
り押し出し、冷却してペレタイザーで再生樹脂ペレット
としたものである。Here, the recycled resin used for the flat yarn and the laminate is manufactured as follows. Among the plastic waste such as molded products, films, sheets, and string-like materials, those containing polyethylene as the main component are sorted out, and crushed, washed, and dried by a known technique.
It is extruded from a nozzle at a melting temperature of 260 ° C. by a screen vent type extruder, cooled and formed into regenerated resin pellets by a pelletizer.
【0021】こうして得られた原料及び添加剤の配合比
率の異なるシートNO.1,NO.2,NO.3,NO.4,NO.5の配
合比率を表1に示す。これらの試験片は山林土中に約24
カ月間埋設した。Table 1 shows the compounding ratios of the sheets NO.1, NO.2, NO.3, NO.4, and NO.5 having different compounding ratios of the raw materials and additives thus obtained. These specimens are approximately 24 in forest soil.
Buried for months.
【0022】[0022]
【表1】 [Table 1]
【0023】24カ月後に各試験片を掘り出して、各試験
片について、目視及びSEMによる外観観察、酸化
開始温度測定、顕微鏡FT−IR測定、引張強力測
定を行い、それらの結果を以下に示す。Twenty-four months later, each test piece was dug out, and the appearance of each test piece was visually observed and observed by SEM, oxidation start temperature measurement, microscope FT-IR measurement, and tensile strength measurement. The results are shown below.
【0024】外観観察 表2に目視及びSEMによる観察結果をまとめて示す。Table 2 summarizes the results of visual observation and SEM observation.
【0025】[0025]
【表2】 [Table 2]
【0026】表2より、ラミネートに再生樹脂を50重量
%混合したシートNO.1,2,3,4,5はSEMによる観
察でミクロクラックが確認でき、再生樹脂量が多く、か
つ、金属塩の多いシートNO.1,2は目視による観察に
おいても明らかに白色化や小孔の発現により樹脂劣化が
進んだ様子が観察された。From Table 2, microcracks can be confirmed by SEM observation of sheets Nos. 1, 2, 3, 4, and 5 in which the recycled resin is mixed in the laminate at 50% by weight. Sheets Nos. 1 and 2, which had a large number of sheets, were visually observed to show a state in which the deterioration of the resin progressed due to whitening and the appearance of small holes.
【0027】酸化開始温度測定 下記の条件でDSC(示差走査熱量計)により測定し、
表3に酸化開始温度測定結果をまとめて示す。Measurement of oxidation onset temperature Measured by a DSC (differential scanning calorimeter) under the following conditions,
Table 3 summarizes the measurement results of the oxidation start temperature.
【0028】 測定機 :メトラー社製 TA−4000,DSC−25 昇温速度:10℃/min. 雰囲気 :80ml/min. 空気中Measuring machine: TA-4000, DSC-25 manufactured by Mettler Inc. Temperature rise rate: 10 ° C./min. Atmosphere: 80 ml / min. In air
【0029】[0029]
【表3】 [Table 3]
【0030】酸化開始温度は、有機材料の酸化を急激に
生ぜしめる温度のことで、酸化開始温度が低いものが分
解性の高い傾向にあることが知られている。表3より、
ラミネートに使用した低密度ポリエチレン製単体フィル
ムの酸化開始温度が210℃であることから、数回の熱履
歴を重ねた再生樹脂を混合したものはその初期の段階で
酸化開始温度が低下しており、埋設期間を経てさらに低
下度合いは増し、酸化劣化が進行していることが確認で
きるが、再生樹脂混合量が30重量%であるシートNO.6
については顕著な効果は認められないものとなった。The oxidation start temperature is a temperature at which oxidation of an organic material is rapidly caused, and it is known that those having a low oxidation start temperature tend to have high decomposability. From Table 3,
Since the oxidation start temperature of the low-density polyethylene single film used for lamination is 210 ° C, the oxidation start temperature of the mixture of regenerated resin with several thermal histories is low at the initial stage. After the burying period, the degree of decrease further increased, and it can be confirmed that oxidative deterioration was progressing. However, sheet No. 6 containing 30% by weight of the recycled resin was used.
No remarkable effect was observed.
【0031】顕微鏡FT−IR測定 日本バイオラッド社製のDIGILAB FTS−60
を用いて、酸化劣化及び分解によって生成するカルボニ
ル基による吸収として1715cm-1の吸光度(ピークの高
さ)を顕微鏡FT−IR測定結果としてまとめて表4に
示す。Microscope FT-IR measurement DIGILAB FTS-60 manufactured by Biorad Japan
Table 4 summarizes the absorbance at 1715 cm -1 (peak height) as absorption by a carbonyl group generated by oxidative deterioration and decomposition, as a result of FT-IR microscopic measurement.
【0032】[0032]
【表4】 [Table 4]
【0033】表4より、1715cm‐1のピークの高さは、
各試験片とも増加しているが、再生樹脂を50重量%混合
すると大きな効果が認められる。また、金属塩を多量に
添加したシートNO.1,2はラミネート工程の溶融加熱
で、既にカルボニル基の生成が認められる。From Table 4, the height of the peak at 1715 cm- 1 is
Each test piece increases, but a large effect is recognized when the regenerated resin is mixed at 50% by weight. Sheets Nos. 1 and 2 to which a large amount of metal salt was added were already found to have carbonyl groups formed by the melting and heating in the laminating step.
【0034】引張強力測定 樹脂劣化が樹脂被覆層を越えて織布にまで進行している
か否かを確認のため、実質的な強度を織布が保持するこ
とから、試験片をJIS3号ダンベルとし、ロードセル
式引張試験機を用いて、引張速度100mm/min.、つかみ間
隔60mm、標線距離20mmの条件により引張強力を測定し、
期間経過後の強度残率を結果として表5にまとめて示
す。Tensile strength measurement In order to confirm whether or not the resin deterioration has progressed beyond the resin coating layer to the woven fabric, the woven fabric retains substantial strength. Using a load cell type tensile tester, measure the tensile strength under the conditions of a pulling speed of 100 mm / min., A gripping distance of 60 mm, and a marked line distance of 20 mm.
Table 5 summarizes the residual strength ratio after the lapse of the period.
【0035】[0035]
【表5】 [Table 5]
【0036】表5より、NO.1,2,3,4は明らかに樹脂
劣化が樹脂被覆層をこえて内部の織布にまで及んでいる
ことが確認できる。一方、NO.5は樹脂被覆層は樹脂劣
化しても織布を形成するフラットヤーンが分解性がない
ため強度低下が発現せず、また、NO.6はNO.1,3と同
様のクロスシートであるにも拘らず強度低下が少ないこ
とから、樹脂被覆層の劣化が起こらないと内部は影響さ
れないことが確認された。From Table 5, it can be confirmed that in Nos. 1, 2, 3, and 4, the deterioration of the resin obviously extends to the inner woven fabric beyond the resin coating layer. On the other hand, in the case of No. 5, even if the resin coating layer deteriorates, the strength of the flat yarn forming the woven fabric is not reduced because the flat yarn forming the woven fabric has no decomposability. Since the strength was not significantly reduced in spite of being a sheet, it was confirmed that the inside was not affected unless the resin coating layer deteriorated.
【0037】[0037]
【発明の効果】以上の観察及び測定結果から、本発明の
構成を満足するNO.1,2,3,4の合成樹脂シートは確実
に樹脂劣化が進行しており、いずれ崩壊し破片化さらに
は分解され、土中に還元される合成樹脂シートであるこ
とが判明し、用済み後の早期分解により環境汚染の少な
い分解性合成樹脂シートとなっている。From the results of the above observations and measurements, the synthetic resin sheets of Nos. 1, 2, 3, and 4 satisfying the constitution of the present invention are surely deteriorating in resin, and eventually collapse and become fragments. Has been found to be a synthetic resin sheet that is decomposed and reduced in the soil, and has become a degradable synthetic resin sheet with little environmental pollution due to early decomposition after use.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−27109(JP,A) 特開 平3−231836(JP,A) 特開 昭60−29743(JP,A) 特開 昭56−146754(JP,A) 特開 昭53−28643(JP,A) 特開 平4−367455(JP,A) 特開 平5−4311(JP,A) 実開 平3−14179(JP,U) (58)調査した分野(Int.Cl.7,DB名) B32B 1/00 - 35/00 D01F 6/46 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-27109 (JP, A) JP-A-3-231836 (JP, A) JP-A-60-29743 (JP, A) JP-A-56-297 146754 (JP, A) JP-A-53-28643 (JP, A) JP-A-4-367455 (JP, A) JP-A-5-4311, JP-A-5-1411 (JP, A) JP-A-3-14179 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B32B 1/00-35/00 D01F 6/46
Claims (2)
粉等の分解性有機質を1〜15重量%加えて180〜2
50℃以下の温度で溶融して押出し製造されるフラット
ヤーンを経緯糸に用いて織成した織布の少なくとも一面
に、ポリオレフィン主鎖にカルボニル基が付加された再
生ポリオレフィン系合成樹脂原料を50重量%以上含む
樹脂被覆層を形成してなることを特徴とする分解性合成
樹脂シート。1. A polyolefin-based synthetic resin is added with 1 to 15% by weight of a decomposable organic material such as starch or modified starch to obtain 180 to 2 parts by weight.
At least one surface of a woven fabric woven using a flat yarn, which is melted at a temperature of 50 ° C. or less and extruded and manufactured as a weft, has a carbonyl group added to a polyolefin main chain.
A degradable synthetic resin sheet comprising a resin coating layer containing 50% by weight or more of a raw polyolefin-based synthetic resin raw material .
織布に用いるポリオレフィン系合成樹脂が、ポリオレフ
ィン主鎖にカルボニル基が付加された再生ポリオレフィ
ン系合成樹脂原料を30重量%以上含む樹脂である請求
項1記載の分解性合成樹脂シート。2. A polyolefin-based synthetic resin used in the fabric woven using a flat yarn to the weft of, polyolefin
Regenerated polyolefin with carbonyl group added to the main chain
The decomposable synthetic resin sheet according to claim 1, wherein the resin is a resin containing 30% by weight or more of a synthetic resin material .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26479393A JP3336091B2 (en) | 1993-10-22 | 1993-10-22 | Degradable synthetic resin sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26479393A JP3336091B2 (en) | 1993-10-22 | 1993-10-22 | Degradable synthetic resin sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07117184A JPH07117184A (en) | 1995-05-09 |
JP3336091B2 true JP3336091B2 (en) | 2002-10-21 |
Family
ID=17408288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26479393A Expired - Fee Related JP3336091B2 (en) | 1993-10-22 | 1993-10-22 | Degradable synthetic resin sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3336091B2 (en) |
-
1993
- 1993-10-22 JP JP26479393A patent/JP3336091B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07117184A (en) | 1995-05-09 |
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