JP4094383B2 - Agricultural decomposition multi-film - Google Patents

Agricultural decomposition multi-film Download PDF

Info

Publication number
JP4094383B2
JP4094383B2 JP2002255872A JP2002255872A JP4094383B2 JP 4094383 B2 JP4094383 B2 JP 4094383B2 JP 2002255872 A JP2002255872 A JP 2002255872A JP 2002255872 A JP2002255872 A JP 2002255872A JP 4094383 B2 JP4094383 B2 JP 4094383B2
Authority
JP
Japan
Prior art keywords
weight
parts
film
resin
film layer
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
Application number
JP2002255872A
Other languages
Japanese (ja)
Other versions
JP2004089091A (en
Inventor
正之 江上
直樹 藤野
邦彦 角田
Original Assignee
みかど化工株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by みかど化工株式会社 filed Critical みかど化工株式会社
Priority to JP2002255872A priority Critical patent/JP4094383B2/en
Publication of JP2004089091A publication Critical patent/JP2004089091A/en
Application granted granted Critical
Publication of JP4094383B2 publication Critical patent/JP4094383B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Biological Depolymerization Polymers (AREA)
  • Protection Of Plants (AREA)
  • Laminated Bodies (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、土壌中において生分解により分解されたり、あるいは光や熱により分解する農業用分解マルチフィルムに関する。
【0002】
【従来の技術】
近年、農業用マルチフィルムの栽培において、生分解性樹脂を原料として成形された生分解マルチフィルムが普及しつつある。生分解マルチフィルムに要求される基本的な性能は、使用中は充分な強度を持ち、使用後は分解し自然環境に還元される性能である。
【0003】
従来の生分解性樹脂は、生体が合成した高分子をモデルとしている。生体は自ら合成した高分子(栄養、エネルギー源等)を利用するための分解機構、即ち酵素分解によりCO2,H2Oまで低分子化、無害化する反応システムをもっている。
【0004】
この高分子として、代表的なものが脂肪族ポリエステル(A-PE)で、各社より化学合成品として市販されている。
【0005】
これらは、土中や水中の微生物より出される酵素(リパーゼ他)により分解され得る。
【0006】
ところが、現在各社から販売されている脂肪族ポリエステルは、マルチフィルムの成形で圧倒的に多く採用されているインフレフィルム成形では、溶融時の張力が弱く、チューブ(インフレ成形で形成される袋状のチューブ)が不安定で成膜が難しく、即ち、成形加工性に劣る問題がある。
【0007】
また、従来の生分解マルチフィルムの原料である前述の脂肪族ポリエステル(A-PE)は、生分解性を良くすると分子量が小さく、また脂肪族ポリエステルは結晶性が高いため、フィルムがタテ方向に配向し易く、保管、使用中に再結晶化もし易い。このため、初期強度、特にタテ方向が弱い問題がある。
【0008】
このため成形加工時、植え穴を開けるときに裂けて破れてしまう問題があり、また畑で使用中にマルチフィルムが破れ易く、ここから剥がれ、いわゆるマルチ効果が低下し野菜生育が悪くなり、さらに雑草が発生する問題がある。
【0009】
【発明が解決しようとする課題】
そこで、本発明は、使用中は充分な強度を持ち、使用後は分解し自然環境に還元される性能を有し、成形加工性に優れ、野菜栽培上支障ない農業用分解マルチフィルムを提供することを課題とする。
【0010】
本発明の他の課題は、以下の記載によって明らかとなる。
【0011】
【課題を解決するための手段】
上記課題は、以下の各発明によって解決される。
【0015】
(請求項)ポリオレフィン樹脂100重量部に、紫外光及び又は熱により活性を示す酸化劣化剤を配合し、更に前記酸化劣化剤の反応を調整する安定剤を調整量配合した樹脂原料Iを用いて成形してなるフィルム層と、脂肪族ポリエステルを含む生分解性に優れた樹脂原料IIを用いて成形してなるフィルム層を積層してなり、土壌中において生分解により分解される農業用分解マルチフィルム。
【0016】
(請求項)ポリオレフィン樹脂100重量部に、紫外光及び又は熱により活性を示す酸化劣化剤を配合し、更に前記酸化劣化剤の反応を調整する安定剤を調整量配合した樹脂原料Iを用いたフィルム層中に、アルミニウムや二酸化チタン、炭酸カルシウムから選ばれる少なくとも1種の光反射性原料を樹脂原料100重量部に対して1〜70重量部配合してなり、脂肪族ポリエステルを含む生分解性に優れた樹脂原料IIを用いたフィルム層中に、カーボンブラックを樹脂原料100重量部に対して1〜20重量部配合してなる請求項記載の農業用分解マルチフィルム。
【0019】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
【0020】
(第1の態様)
第1の態様は、脂肪族ポリエステルに芳香族基であるテレフタル酸構造を組み入れた樹脂原料Iを用いて成形してなるフィルム層(A)と、芳香族基を含まない脂肪族ポリエステルからなる生分解性に優れた樹脂原料IIを用いて成形してなるフィルム層(B)を積層したもので、土壌中において生分解により分解される農業用分解マルチフィルムである。
【0022】
かかる樹脂原料Iは、構造式中に、強度的には優れるが生分解性の劣る芳香族基を有する化合物が好ましく、例えば、以下の構造式で表されるBASF社製「ECOFLEX」を用いることができる。
【0023】
【化1】

Figure 0004094383
【0024】
上記化1で示される化合物は、いわゆる脂肪族ポリエステルにテレフタル酸構造を組み入れ、分子量も大きく、強度柔軟性に優れ、成形安定性もよい。
【0025】
上記化1で示される化合物からなるフイルム(厚み20μm)の伸び、強度、引裂き性、耐候性、分解性は、以下の特性を有する。
【0026】
伸び : 300%以上
強度 : 20MPa以上
引裂き性:10g以上
耐候性 :1ヶ月以上
生分解性:3ヶ月以上
【0027】
樹脂原料IIは、生分解性に優れた脂肪族ポリエステルからなる構造式のものが用いられる。脂肪族ポリエステルとしては、ポリ乳酸、ポリカプロラクトン、ポリエチレンサクシネート、ポリブチレンサクシネート、ポリブチレンサクシネートアジペート、ポリヒドロキシブチレート、ポリエステルカーボネート、ポリヒドロキシブチレート/ヒドロキシバリレート、等の脂肪族ポリエステルが挙げられる。
【0028】
中でも好ましいのは、例えば、以下の構造式で表される昭和高分子社製「ビオノーレ」である。
【0029】
【化2】
Figure 0004094383
【0030】
上記化2で示される化合物からなるフイルム(厚み20μm)の伸び、強度、引裂き性、耐候性、分解性は、以下の特性を有する。
【0031】
伸び : 300%以上
強度 : 20MPa以上
引裂き性:10g以下
耐候性 :1ヶ月以上
生分解性:3ヶ月以下
【0032】
本態様のフィルムを使用するには、フィルム層(B)を土壌側に向くようにすることが好ましい。
【0033】
本態様のフィルムが生分解性を示すのは、基本的には、生分解性の良いフィルム層(B)と悪いフィルム層(A)を積層すると、良いフィルム層(B)側で分解が進み、それが分解性の悪いフィルム層(A)側に影響を与えることによる。
【0034】
本発明者は、生分解し難いフィルム層と生分解し易いフィルム層を土中に埋設して置くと、生分解し易いフィルム層の分解に伴い、生分解し難いフィルム層の分解が促進されることを見いだした。
【0035】
一般土壌中には、分解酵素を持つ微生物が多数生息し、しかもほぼ均一に生息している。生分解フィルムの近くに居る微生物は、酵素を分泌し、これが生分解フィルムに作用する(=酵素分解開始)。そして、生分解し易いフィルム層の分解により、分解微生物が極所的に増殖し、大量の酵素を分泌し、この大量の酵素が生分解し難いフィルム層に作用し、生分解の促進を促す。
【0036】
本態様でより好ましいのは、黒色層を有する光反射性フィルムを構成することであり、具体的には生分解し難いフィルム層(A)中に、アルミニウム、二酸化チタン、炭酸カルシウムから選ばれる少なくとも1種の光反射性原料、好ましくは二酸化チタンを樹脂原料100重量部に対して1〜70重量部配合し、生分解性の良いフィルム層(B)中に、カーボンブラックを樹脂原料100重量部に対して1〜20重量部配合することである。
【0037】
本態様のように、無機フィラーを含有すると、耐候性が向上し、分解性が更に向上し、チューブ安定性が向上する。
【0038】
即ち、一般に無機フィラーを添加すると、溶融樹脂の溶融張力は大きくなる。特にカーボンブラックのような一次粒子が極微粒(1/100μmレベル)で、それ自身が凝集し、2次構造を作り易いフィラーで顕著である。
【0039】
いずれにしても、樹脂とフィラー表面(多くは、極性基を持つ活性表面、しかも凸凹があり、相互作用面が大きい)との間で何らかの相互作用が生じ、いわゆる、“架橋構造”に近い構造を形成することで、溶融張力が大きくなり、インフレフィルム成形でのチューブ“腰”が強くなり、偏肉、フィルム巾、耳ズレなどが向上する。
【0040】
二酸化チタンの粒径は、5〜500nmの範囲が好ましく、カーボンブラックの粒径は、1〜100nmの範囲が好ましい。
【0041】
本態様では、上記樹脂原料以外に、従来公知の界面活性剤、耐候安定剤、紫外線吸収剤、滑剤、アンチブロッキング剤等を添加することもできる。
【0042】
(第2の態様)
第2の態様は、分解過程として酸化劣化の過程を経て、最終的に生分解されて炭酸ガスと水になる樹脂原料Iを用いて成形してなるフィルム層(A)と、脂肪族ポリエステルからなる生分解性に優れた樹脂原料IIを用いて成形してなるフィルム層(B)を積層してなる態様である。
【0043】
樹脂原料Iのベース樹脂はポリオレフィン樹脂であり、これに紫外光及び又は熱により活性を示す酸化劣化剤を配合し、酸化劣化を促進させる。しかし、フィルム保管中や使用時に酸化劣化が急速に進んでは商品価値がないので、その酸化劣化の速度を制御するために酸化劣化剤の反応を調整する安定剤を調整量配合する。
【0044】
酸化劣化剤を含有する思想は、基本的には、フィルムの耐久性、耐候性を追及する思想と逆行するが、本発明では、ある程度の使用期間経過後は、酸化劣化を敢えて促進させる思想である。酸化劣化剤の配合量はベース樹脂100重量部に、たとえばチバスペシャリティーケミカル社の「ENVIROCARE」を1.0〜5.0重量%配合する。酸化劣化剤の反応を調整する安定剤はたとえばチバスペシャリティーケミカル社の「TINUVIN622」を0.1〜1.0重量%配合する。
【0045】
ポリオレフィン樹脂としては、LDPE(低密度ポリエチレン)、HDPE(高密度ポリエチレン)、LLDPE(鎖状低密度ポリエチレン)などが挙げられる。
【0046】
本態様でより好ましいのは、黒色層を有する光反射性フィルムを構成することであり、具体的には生分解し難いフィルム層(A)中に、アルミニウム、二酸化チタン、炭酸カルシウムから選ばれる少なくとも1種の光反射性原料、好ましくは二酸化チタンを樹脂原料100重量部に対して1〜70重量部配合し、生分解性の良いフィルム層(B)中に、カーボンブラックを樹脂原料100重量部に対して1〜20重量部配合することである。
【0047】
本態様のように、無機フィラーを含有すると、耐候性が向上し、分解性が更に向上し、チューブ安定性が向上する。
【0048】
(第3の態様)
第3の態様は、生分解性の劣る脂肪族ポリカーボネートと脂肪族ポリエステルの共重合樹脂からなる樹脂原料Iを用いて成形してなるフィルム層(A)と、脂肪族ポリエステルからなる生分解性に優れた樹脂原料IIを用いて成形してなるフィルム層(B)を積層してなる態様である。
【0049】
樹脂原料Iは、構造式中に、強度的には優れるが生分解性の劣るポリカーボネートを有する化合物であり、例えば、以下の構造式で表される三菱ガス化学社製「ユーペック」を用いることができる。
【0050】
【化3】
Figure 0004094383
【0051】
上記化3で示される化合物は、いわゆる脂肪族ポリエステルにポリカーボネート構造を組み入れ、分子量も大きく、強度柔軟性に優れ、成形安定性もよい。
【0052】
上記化3で示される化合物からなるフイルム(厚み20μm)の伸び、強度、引裂き性、耐候性、分解性は、以下の特性を有する。
【0053】
伸び : 300%以上
強度 : 20MPa以上
引裂き性:10g以上
耐候性 :1ヶ月以上
生分解性:3ヶ月以上
【0054】
本態様でより好ましいのは、黒色層を有する光反射性フィルムを構成することであり、具体的には生分解し難いフィルム層(A)中に、アルミニウム、二酸化チタン、炭酸カルシウムから選ばれる少なくとも1種の光反射性原料、好ましくは二酸化チタンを樹脂原料100重量部に対して1〜70重量部配合し、生分解性の良いフィルム層(B)中に、カーボンブラックを樹脂原料100重量部に対して1〜20重量部配合することである。
【0055】
本態様のように、無機フィラーを含有すると、耐候性が向上し、分解性が更に向上し、チューブ安定性が向上する。
【0056】
(その他の態様)
生分解し易い樹脂原料としては、脂肪族ポリエステル以外に、ポリセルロースアセテート等のセルロース系樹脂、変性ポリビニールアルコールであってもよく、さらにこれらと澱粉や木粉、椰子殻粉等の有機微粉末との混合物、炭酸カルシウムや二酸化珪素等無機微粉末との混合物、二酸化チタン、カーボンブラック、アルミ粉等着色顔料を配合した物であってもよい。
【0057】
本発明の農業用分解マルチフィルムの製造法としては、上記の原料を用い、インレフレ成形によって形成できる。
【0058】
本発明の農業用分解マルチフィルムの厚みは、3〜50μm程度が好ましく、より好ましくは5〜35μmの範囲である。
【0059】
【発明の効果】
本発明によれば、使用中は充分な強度を持ち、使用後は分解し自然環境に還元される性能を有し、成形加工性に優れ、野菜栽培上支障ない農業用分解マルチフィルムを提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an agricultural multi-film which is decomposed by biodegradation in soil or decomposes by light or heat.
[0002]
[Prior art]
In recent years, in the cultivation of agricultural multi-films, biodegradable multi-films molded using biodegradable resins as raw materials are becoming widespread. The basic performance required for a biodegradable multi-film is that it has sufficient strength during use and is decomposed and reduced to the natural environment after use.
[0003]
Conventional biodegradable resins are modeled on polymers synthesized by living bodies. The living body has a decomposition mechanism for utilizing a polymer (nutrition, energy source, etc.) synthesized by itself, that is, a reaction system that lowers the molecular weight to CO 2 and H 2 O and makes them harmless by enzymatic decomposition.
[0004]
A typical example of this polymer is aliphatic polyester (A-PE), which is commercially available as a chemically synthesized product from various companies.
[0005]
These can be decomposed by enzymes (lipase etc.) produced by microorganisms in soil or water.
[0006]
However, the aliphatic polyesters currently sold by each company are weak in tension at the time of melting in inflation film molding, which is overwhelmingly used in the molding of multi-films. Tube) is unstable and film formation is difficult, that is, there is a problem that molding processability is poor.
[0007]
In addition, the above-mentioned aliphatic polyester (A-PE), which is a raw material for conventional biodegradable multifilms, has a low molecular weight when biodegradability is improved, and the aliphatic polyester has high crystallinity, so the film is in the vertical direction. It is easy to orient and recrystallize during storage and use. For this reason, there is a problem that the initial strength, particularly the vertical direction, is weak.
[0008]
For this reason, there is a problem of tearing and tearing when forming a planting hole during molding processing, and the multi-film is easily torn during use in the field, peeling off from here, so-called multi-effect is reduced and vegetable growth is worsened. There is a problem of weeds.
[0009]
[Problems to be solved by the invention]
Accordingly, the present invention provides an agricultural multi-film for agriculture that has sufficient strength during use, has the ability to be decomposed and reduced to the natural environment after use, has excellent moldability, and does not hinder vegetable cultivation. This is the issue.
[0010]
The other subject of this invention becomes clear by the following description.
[0011]
[Means for Solving the Problems]
The above problems are solved by the following inventions.
[0015]
(Claim 1 ) Using a resin raw material I in which 100 parts by weight of a polyolefin resin is blended with an oxidative degradation agent that is active by ultraviolet light and / or heat, and a stabilizer for adjusting the reaction of the oxidative degradation agent is blended in an adjusted amount. Agricultural degradation which is formed by laminating a film layer formed by molding and a film layer formed by using a resin raw material II containing aliphatic polyester and having excellent biodegradability, and is decomposed by biodegradation in the soil. Multi film.
[0016]
(Claim 2 ) A resin raw material I in which 100 parts by weight of a polyolefin resin is blended with an oxidative degradation agent that is active by ultraviolet light and / or heat, and is further blended with a stabilizer for adjusting the reaction of the oxidative degradation agent is used. 1 to 70 parts by weight of at least one light-reflecting material selected from aluminum, titanium dioxide, and calcium carbonate with respect to 100 parts by weight of the resin material, and biodegradation containing aliphatic polyester excellent the resin film material layer using II, agricultural degradation multi-film according to claim 1, wherein by blending 1 to 20 parts by weight of carbon black to the resin material 100 parts by sexual.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0020]
(First aspect)
In the first aspect, a film layer (A) formed by using a resin raw material I in which an terephthalic acid structure that is an aromatic group is incorporated into an aliphatic polyester, and a raw material comprising an aliphatic polyester that does not contain an aromatic group. A film layer (B) formed by using a resin raw material II excellent in decomposability is laminated, and is an agricultural multi-film that is decomposed by biodegradation in soil.
[0022]
The resin raw material I is preferably a compound having an aromatic group which is excellent in strength but inferior in biodegradability in the structural formula. For example, “ECOFLEX” manufactured by BASF Corporation represented by the following structural formula is used. Can do.
[0023]
[Chemical 1]
Figure 0004094383
[0024]
The compound represented by Chemical Formula 1 incorporates a terephthalic acid structure into a so-called aliphatic polyester, has a large molecular weight, excellent strength flexibility, and good molding stability.
[0025]
The elongation, strength, tearability, weather resistance, and decomposability of the film (thickness 20 μm) comprising the compound represented by the above chemical formula 1 have the following characteristics.
[0026]
Elongation: 300% or more Strength: 20 MPa or more Tearability: 10 g or more Weather resistance: 1 month or more Biodegradability: 3 months or more [0027]
As the resin raw material II, one having a structural formula made of an aliphatic polyester excellent in biodegradability is used. Examples of the aliphatic polyesters, polylactic acid, polycaprolactone, polyethylene succinate, polybutylene succinate, polybutylene succinate adipate, polyhydroxybutyrate, polyester carbonate, polyhydroxybutyrate / hydroxyvalerate, aliphatic polyester Le etc. Is mentioned.
[0028]
Among these, “Bionore” manufactured by Showa Polymer Co., Ltd. represented by the following structural formula is preferable.
[0029]
[Chemical 2]
Figure 0004094383
[0030]
The elongation, strength, tearability, weather resistance, and decomposability of the film (thickness 20 μm) comprising the compound represented by the chemical formula 2 have the following characteristics.
[0031]
Elongation: 300% or more Strength: 20 MPa or more Tearability: 10 g or less Weather resistance: 1 month or more Biodegradability: 3 months or less [0032]
In order to use the film of this aspect, it is preferable to make the film layer (B) face the soil side.
[0033]
The film of this aspect shows biodegradability. Basically, when a film layer (B) having a good biodegradability and a film layer (A) having a good biodegradability are laminated, the decomposition proceeds on the good film layer (B) side. This is because it affects the film layer (A) having poor degradability.
[0034]
When the inventor embeds a biodegradable film layer and a biodegradable film layer embedded in the soil, the decomposition of the biodegradable film layer is promoted with the decomposition of the biodegradable film layer. I found out.
[0035]
In general soil, many microorganisms with degrading enzymes inhabit, and inhabit almost uniformly. Microorganisms in the vicinity of the biodegradable film secrete enzymes, which act on the biodegradable film (= start of enzymatic degradation). Degradation of the biodegradable film layer proliferates the microorganisms locally and secretes a large amount of enzyme, which acts on the film layer that is difficult to biodegrade and promotes biodegradation. .
[0036]
More preferable in this embodiment is to constitute a light reflective film having a black layer. Specifically, in the film layer (A) that is difficult to biodegrade, at least selected from aluminum, titanium dioxide, and calcium carbonate. One kind of light-reflecting raw material, preferably 1 to 70 parts by weight of titanium dioxide is blended with respect to 100 parts by weight of the resin raw material, and carbon black is added to 100 parts by weight of the resin raw material in the biodegradable film layer (B) 1 to 20 parts by weight based on the weight.
[0037]
When an inorganic filler is contained as in this embodiment, weather resistance is improved, decomposability is further improved, and tube stability is improved.
[0038]
That is, generally, when an inorganic filler is added, the melt tension of the molten resin increases. In particular, the primary particles such as carbon black are extremely fine particles (1/100 μm level), and the particles themselves are agglomerated to make a secondary structure.
[0039]
In any case, some kind of interaction occurs between the resin and the filler surface (many active surfaces with polar groups, and there are irregularities, and the interaction surface is large), which is a structure close to the so-called “crosslinked structure”. By forming, the melt tension increases, the tube “waist” in the inflation film molding becomes stronger, and uneven thickness, film width, ear misalignment, etc. are improved.
[0040]
The particle size of titanium dioxide is preferably in the range of 5 to 500 nm, and the particle size of carbon black is preferably in the range of 1 to 100 nm.
[0041]
In this embodiment, conventionally known surfactants, weathering stabilizers, ultraviolet absorbers, lubricants, antiblocking agents and the like can be added in addition to the resin raw materials.
[0042]
(Second aspect)
The second embodiment is a film layer (A) formed by using a resin raw material I which is subjected to an oxidative deterioration process as a decomposition process and is finally biodegraded into carbon dioxide gas and water, and an aliphatic polyester. It is the aspect formed by laminating | stacking the film layer (B) formed by using the resin raw material II excellent in biodegradability.
[0043]
The base resin of the resin raw material I is a polyolefin resin, and an oxidative degradation agent that exhibits activity by ultraviolet light and / or heat is blended therein to promote oxidative degradation. However, since there is no commercial value when the oxidative degradation rapidly progresses during film storage or use, an adjusted amount of a stabilizer for adjusting the reaction of the oxidative degradation agent is blended in order to control the rate of the oxidative degradation.
[0044]
The idea of containing an oxidative deterioration agent is basically the reverse of the idea of pursuing the durability and weather resistance of a film, but in the present invention, after a certain period of use, the idea of daringly promoting oxidative deterioration is there. For example, “ENVIROCARE” manufactured by Ciba Specialty Chemicals is blended in an amount of 1.0 to 5.0% by weight in 100 parts by weight of the base resin. As a stabilizer for adjusting the reaction of the oxidative degradation agent, for example, 0.1 to 1.0% by weight of “TINUVIN622” manufactured by Ciba Specialty Chemicals is blended.
[0045]
Examples of the polyolefin resin include LDPE (low density polyethylene), HDPE (high density polyethylene), and LLDPE (chain low density polyethylene).
[0046]
More preferable in this embodiment is to constitute a light reflective film having a black layer. Specifically, in the film layer (A) that is difficult to biodegrade, at least selected from aluminum, titanium dioxide, and calcium carbonate. One kind of light-reflecting raw material, preferably 1 to 70 parts by weight of titanium dioxide is blended with respect to 100 parts by weight of the resin raw material, and carbon black is added to 100 parts by weight of the resin raw material in the biodegradable film layer (B) 1 to 20 parts by weight based on the weight.
[0047]
When an inorganic filler is contained as in this embodiment, weather resistance is improved, decomposability is further improved, and tube stability is improved.
[0048]
(Third aspect)
In the third aspect, the film layer (A) formed by using a resin raw material I made of a copolymer resin of an aliphatic polycarbonate and an aliphatic polyester having poor biodegradability, and biodegradability made of an aliphatic polyester In this embodiment, the film layer (B) formed by using the excellent resin raw material II is laminated.
[0049]
The resin raw material I is a compound having a polycarbonate having a structural formula that is excellent in strength but inferior in biodegradability. For example, “UPEK” manufactured by Mitsubishi Gas Chemical Co., Ltd. represented by the following structural formula may be used. it can.
[0050]
[Chemical 3]
Figure 0004094383
[0051]
The compound represented by Chemical Formula 3 incorporates a polycarbonate structure in a so-called aliphatic polyester, has a large molecular weight, excellent strength flexibility, and good molding stability.
[0052]
The elongation, strength, tearability, weather resistance, and decomposability of the film (thickness 20 μm) made of the compound represented by Chemical Formula 3 have the following characteristics.
[0053]
Elongation: 300% or more Strength: 20 MPa or more Tearability: 10 g or more Weather resistance: 1 month or more Biodegradability: 3 months or more [0054]
More preferable in this embodiment is to constitute a light reflective film having a black layer. Specifically, in the film layer (A) that is difficult to biodegrade, at least selected from aluminum, titanium dioxide, and calcium carbonate. One light-reflecting raw material, preferably 1 to 70 parts by weight of titanium dioxide is blended with respect to 100 parts by weight of the resin raw material, and carbon black is added to 100 parts by weight of the resin raw material in the film layer (B) having good biodegradability. 1 to 20 parts by weight based on the weight.
[0055]
When an inorganic filler is contained as in this embodiment, the weather resistance is improved, the decomposability is further improved, and the tube stability is improved.
[0056]
(Other aspects)
In addition to aliphatic polyesters, biodegradable resin materials may be cellulose resins such as polycellulose acetate, modified polyvinyl alcohol, and organic fine powders such as starch, wood powder, and coconut shell powder. Or a mixture of inorganic fine powders such as calcium carbonate and silicon dioxide, or a mixture of colored pigments such as titanium dioxide, carbon black, and aluminum powder.
[0057]
As a manufacturing method of the decomposition | degradation multifilm for agriculture of this invention, it can form by infreforming using said raw material.
[0058]
As for the thickness of the decomposition | degradation multifilm for agriculture of this invention, about 3-50 micrometers is preferable, More preferably, it is the range of 5-35 micrometers.
[0059]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the decomposition | disassembly multifilm for agriculture which has sufficient intensity | strength during use, has the performance decomposed | disassembled and reduced to natural environment after use, is excellent in moldability, and does not have trouble in vegetable cultivation is provided. be able to.

Claims (2)

ポリオレフィン樹脂100重量部に、紫外光及び又は熱により活性を示す酸化劣化剤を配合し、更に前記酸化劣化剤の反応を調整する安定剤を調整量配合した樹脂原料Iを用いて成形してなるフィルム層と、脂肪族ポリエステルを含む生分解性に優れた樹脂原料IIを用いて成形してなるフィルム層を積層してなり、土壌中において生分解により分解される農業用分解マルチフィルム。  Molded by using a resin raw material I in which 100 parts by weight of a polyolefin resin is blended with an oxidative degradation agent that exhibits activity by ultraviolet light and / or heat, and a stabilizer for regulating the reaction of the oxidative degradation agent is blended in an adjusted amount. An agriculturally decomposed multi-film which is formed by laminating a film layer and a film layer formed by using a resin raw material II containing an aliphatic polyester and having excellent biodegradability, and is decomposed by biodegradation in soil. ポリオレフィン樹脂100重量部に、紫外光及び又は熱により活性を示す酸化劣化剤を配合し、更に前記酸化劣化剤の反応を調整する安定剤を調整量配合した樹脂原料Iを用いたフィルム層中に、アルミニウムや二酸化チタン、炭酸カルシウムから選ばれる少なくとも1種の光反射性原料を樹脂原料100重量部に対して1〜70重量部配合してなり、脂肪族ポリエステルを含む生分解性に優れた樹脂原料IIを用いたフィルム層中に、カーボンブラックを樹脂原料100重量部に対して1〜20重量部配合してなる請求項記載の農業用分解マルチフィルム。In a film layer using a resin raw material I in which 100 parts by weight of a polyolefin resin is blended with an oxidative degradation agent that is active by ultraviolet light and / or heat, and a stabilizer for regulating the reaction of the oxidative degradation agent is blended in an adjusted amount. A resin excellent in biodegradability containing aliphatic polyester, comprising 1 to 70 parts by weight of at least one light-reflecting material selected from aluminum, titanium dioxide, and calcium carbonate based on 100 parts by weight of resin material the film layer using a material II, agricultural degradation multi-film according to claim 1, wherein by blending 1 to 20 parts by weight of carbon black to the resin material 100 parts by weight.
JP2002255872A 2002-08-30 2002-08-30 Agricultural decomposition multi-film Expired - Fee Related JP4094383B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002255872A JP4094383B2 (en) 2002-08-30 2002-08-30 Agricultural decomposition multi-film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002255872A JP4094383B2 (en) 2002-08-30 2002-08-30 Agricultural decomposition multi-film

Publications (2)

Publication Number Publication Date
JP2004089091A JP2004089091A (en) 2004-03-25
JP4094383B2 true JP4094383B2 (en) 2008-06-04

Family

ID=32061251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002255872A Expired - Fee Related JP4094383B2 (en) 2002-08-30 2002-08-30 Agricultural decomposition multi-film

Country Status (1)

Country Link
JP (1) JP4094383B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2318943A1 (en) * 2006-03-03 2009-05-01 Alternativas Actuales De Construccion, S.L. Device for the vertical transportation of persons and materials (Machine-translation by Google Translate, not legally binding)
WO2014054182A1 (en) * 2012-10-05 2014-04-10 シーアイ化成株式会社 Biodegradable mulching film

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005002165A (en) * 2003-06-10 2005-01-06 Daicel Chem Ind Ltd Biodegradable resin composition, agricultural mulching film and method for inhibiting biodegradability
JP2006118057A (en) * 2004-10-19 2006-05-11 Spacio Kk Heat-shielding sheet and its installation structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2318943A1 (en) * 2006-03-03 2009-05-01 Alternativas Actuales De Construccion, S.L. Device for the vertical transportation of persons and materials (Machine-translation by Google Translate, not legally binding)
WO2014054182A1 (en) * 2012-10-05 2014-04-10 シーアイ化成株式会社 Biodegradable mulching film

Also Published As

Publication number Publication date
JP2004089091A (en) 2004-03-25

Similar Documents

Publication Publication Date Title
EP1490435B1 (en) Lactic acid-based resin composition
JP5280368B2 (en) Chemical additives that make polymer materials biodegradable
WO2019189745A1 (en) Biodegradable laminate
JP5274251B2 (en) Manufacturing method of polylactic acid-based molded products
JP2010508425A5 (en)
WO1999063001A1 (en) Biodegradable polyester resin composition, biodisintegrable resin composition, and molded objects of these
KR20200047171A (en) Resin composition for mulching film of controlling biodegradation rate and biodegradable mulching film using the same
JP2000238194A (en) Biodegradable laminate film and agricultural biodegradable film
CN1246385C (en) Biodegradable resin composition with controlled biodegradation rate film and agricutlural mulch film
JP2013179881A (en) Mulch film
CN117795004A (en) Biodegradable resin composition, biodegradable film and biodegradable mulch film each using the same
JP4094383B2 (en) Agricultural decomposition multi-film
JP2002047402A (en) Biodegradable multi film for agriculture
JP2016215589A (en) Biodegradable resin sheet
JP2005237225A (en) Decomposable agricultural mulch film
JP2004147613A (en) Biodegradable mulch for agriculture
JP2013172678A (en) Biodegradable mulch film
JP4318551B2 (en) Biodegradable agricultural multi-film
JPH1148436A (en) Agricultural biodegradation sheet
JP7276777B2 (en) Seedling pot body and method for promoting decomposition thereof
KR20210005339A (en) Biodegradable mulching film having the improved anti-hydrolysis property and manufacturing method thereof
WO2021157618A1 (en) Seedling-growing pot body with long-term stability, and decomposition promotion method therefor
JP2002348406A (en) Disposition method os agricultural mulching film
JP2004180522A (en) Weed-proofing film or sheet
JP2000256471A (en) Biodegradable film

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050706

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070208

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070904

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20071011

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20071127

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080108

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080205

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080305

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110314

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120314

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130314

Year of fee payment: 5

LAPS Cancellation because of no payment of annual fees