JP2004147543A - Porous pipe - Google Patents
Porous pipe Download PDFInfo
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- JP2004147543A JP2004147543A JP2002315457A JP2002315457A JP2004147543A JP 2004147543 A JP2004147543 A JP 2004147543A JP 2002315457 A JP2002315457 A JP 2002315457A JP 2002315457 A JP2002315457 A JP 2002315457A JP 2004147543 A JP2004147543 A JP 2004147543A
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- flow rate
- melt flow
- porous pipe
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
この発明は、多孔質パイプに関する。
【0002】
【従来の技術】
従来、農地等の潅水用ホースとして、発泡体からなる多孔質パイプが用いられている。前記潅水用多孔質パイプは、発泡体の微細な孔からパイプ内の水が外部へ浸出することによって潅水する。また、前記潅水用多孔質パイプには、適度な透水性と強度及び柔軟性が求められる。前記潅水用多孔質パイプの例として、低粘度ポリエチレン系樹脂と、高粘度ポリエチレン系樹脂と、ポリプロピレン系樹脂を主とする樹脂組成物を発泡成形させたものがある(特許文献1参照。)。
【0003】
【特許文献1】
特開2001−78592号公報
【0004】
【発明が解決しようとする課題】
しかし、前記低粘度ポリエチレン系樹脂と、高粘度ポリエチレン系樹脂と、ポリプロピレン系樹脂を主とする樹脂組成物を発泡成形させた多孔質パイプにあっては、セル構造が非常に細かくなって透水量が少なくなり、潅水性が充分とは言い難い場合がある。
【0005】
この発明は、潅水に適した透水量が得られるとともに、成形性が良好で、敷設の際に必要な柔軟性を備える多孔質パイプを提供するものである。
【0006】
【課題を解決するための手段】
この発明は、ゴム又はプラスチックの粉砕物の少なくとも一方と、ゴム又はプラスチックの粉砕物の少なくとも一方と、メルトフローレイトの加重平均値が0.5〜0.9g/10minとなるように組み合わせた複数のポリオレフィン樹脂とを混練・押出成形してなる多孔質パイプに係る。
【0007】
この発明において粉砕物として用いられるゴムは、天然ゴム、合成ゴムの何れか一方、あるいは両方でもよい。また、前記ゴムと同様に粉砕物として用いられるプラスチックとしては、適宜のものが用いられるが、特にポリウレタンが好ましい。ポリウレタンとしては、軟質、半硬質、硬質発泡体、さらにはポリウレタンエラストマーの何れでもよく、またそれらを混合して用いてもよい。特にゴム及びポリウレタンの発泡体は弾性を有するため、得られる多孔質パイプに適度な柔軟性を付与することができる。前記粉砕物の径は、0.8〜1.2mmが好ましい。小さすぎると、粉砕物を混入する効果が得られにくく、また大きすぎるとパイプの成形性が損なわれるようになる。前記粉砕物の量は、押出原料100重量部中30〜50重量部が好ましい。また、前記粉砕物は、予め粒状に形成されたものと相違し、粉砕によって表面が凹凸になるため、粉砕物間に空隙を生じやすく、前記空隙により透水性が良好になる。なお、前記ゴム、プラスチックの粉砕物は、廃棄物を粉砕したものであってもよい。
【0008】
この発明において用いられるポリオレフィン樹脂は、メルトフローレイト(MFR:JIS K 7210 A法準拠)の加重平均値が、0.5〜0.9g/10minとなるように組み合わせた複数のものが用いられる。使用可能なポリオレフィン樹脂としては、通常市販されている高圧法、中圧法又は低圧法により製造されたポリエチレン、エチレン−プロピレン共重合体、エチレン−ブテン共重合体、エチレン−酢酸ビニル共重合体、エチレンとメチル、エチル、プロピル若しくはブチルの各アクリル酸エステル(このエステルの含有量;45モル%以内)との共重合体、又はこれらのそれぞれ塩素含有率60重量%まで塩素化したもの等を挙げることができる。
【0009】
前記ポリオレフィン樹脂におけるメルトフローレイトの加重平均値を0.5〜0.9g/10minとしたことにより、押出成形時に、前記粉砕物間の空隙にポリオレフィン樹脂が侵入し難く、前記空隙を完全に塞ぐことなく前記粉砕物同士を結合できるため、前記粉砕物間の残存空隙の連通によって生じる透水性を適度にできると共に、前記粉砕物同士を強固に結合することができ、多孔質パイプの強度を十分なものにできる。なお、メルトフローレイトの加重平均値が前記範囲より大きいと、空隙を完全に塞ぐため、透水性が得られない。それに対して、メルトフローレイトの加重平均値が前記範囲より小さいと、透水性が異常に大きくなる。また、押出成形時に、前記粉砕物間の空隙にポリオレフィン樹脂が全く侵入しなくなって粉砕物同士の結合力が弱まり、得られる多孔質パイプの強度が不足するようになり、成形時に樹脂が成形カスとして付着する。
【0010】
特に、前記ポリオレフィン樹脂としては、入手のしやすさ、材料コスト、メルトフローレイトの加重平均値の調整しやすさ等の点から、メルトフローレイトが1.0〜1.6g/10minの直鎖状低密度ポリエチレン(LLDPE)と、メルトフローレイトが0.05〜0.16g/10minの高密度ポリエチレン(HDPE)とを組み合わせて使用するのが好ましい。
【0011】
なお、前記ポリオレフィン樹脂の他に、その他の樹脂や水、添加物(着色剤、物性改良剤等)を適宜加えてもよい。
【0012】
前記多孔質パイプの製造は、前記ゴム又はプラスチックの粉砕物の少なくとも一方と、メルトフローレイトの加重平均値が0.5〜0.9g/10minとなるように組み合わせた複数のポリオレフィン樹脂とを、公知の押出機を用いて混練・押出成形することによって行われる。得られた多孔質パイプは、前記粉砕物同士が前記ポリオレフィン樹脂によって結合されていると共に、前記粉砕物間の空隙によって多孔質を構成し、かつ前記粉砕物間の空隙が連通しているため、透水性を発揮する。
【0013】
【実施例】
ブタジエンゴムあるいは軟質ポリウレタン発泡体を粉砕装置で0.8〜1.2mm(平均粒子径1.0mm)に粉砕した粉砕物と、メルトフローレイト(MFR)が1.0,1.3,1.6g/10minの直鎖状低密度ポリエチレンと、メルトフローレイト(MFR)が0.05,0.1,0.16g/10minの高密度ポリエチレンとを、表1に示す配合割合(表の数値は重量部)にして、押出成形機(中部機械製、ダイ径30mm、シリンダ温度170℃、ダイ温度175℃、引き取り速度1.3m/min)に投入し、混練・押出成形を行って実施例1〜6の多孔質パイプ(外径10mm、肉厚2.5mm)を得た。また、メルトフローレイトの加重平均値あるいは粉砕物の粒径がこの発明の範囲から外れる比較例の多孔質パイプを、前記実施例と同じ押出成形機を用いて製造した。比較例の配合は表2に示す。なお、前記実施例及び比較例の製造時における成形性(オリフィスのカス付着量)は、表1及び表2の下部に示す通りである。
【0014】
【表1】
【0015】
【表2】
【0016】
前記のようにして得られた各実施例及び比較例の多孔質パイプについて、製品外観及び透水量を調べた。製品外観は、目視によって多孔質パイプの表面の荒れ、欠肉の有無を調べた。また、透水量は、長さ1000mmの樋を水平に対して5度傾けて保持し、前記樋上に実施例及び比較例の多孔質パイプを配置し、前記多孔質パイプの上端に0.15MPaの圧力で水を供給し、前記樋の下端には計量カップを配置して、前記多孔質パイプの側壁から浸出して樋を流下してくる水を計量カップで受け、1分間当たりの水の量を計算し、その計算値を前記多孔質パイプの透水量(cc/m/min)とした。それらの結果は、表1、表2の下部に示す通りである。なお、前記実施例の多孔質パイプは、柔軟性があり、容易に曲げることができた。
【0017】
表1及び表2の結果から理解されるように、実施例の多孔質パイプは、製造時に押出成形機のオリフィスにカスが付着しにくく、量産性に優れるものである。また、実施例の多孔質パイプは、外観が良好で、透水量が750〜880cc/m/minであり、潅水に適するものであった。
【0018】
【発明の効果】
以上説明したように、この発明の多孔質パイプによれば、ゴム又はプラスチックの粉砕物の少なくとも一方と、メルトフローレイトの加重平均値が0.5〜0.9g/10minとなるように組み合わせた複数のポリオレフィン樹脂とを混練・押出成形したものであるため、粉砕物間の空隙によって透水性が確保され、しかも、前記粉砕物間がポリオレフィン樹脂によって完全に塞がれることなく、適度な空隙が粉砕物間に形成されるため、潅水に好適な透水性を得ることができる。
【0019】
また、前記ポリオレフィン樹脂として、メルトフローレイトが1.0〜1.6g/10minの直鎖状低密度ポリエチレンと、メルトフローレイトが0.05〜0.16g/10minの高密度ポリエチレンを用いれば、容易にメルトフローレイトの加重平均値を0.5〜0.9g/10minとすることができ、特殊なポリオレフィン樹脂を用いなくてもよいため、多孔質パイプを安価にすることができる。
【0020】
さらに、前記粉砕物の径を0.8〜1.2mmとすることによって、透水性をより確実に潅水に適したものにすることができる。さらにまた、前記プラスチックの粉砕物をポリウレタンとして、ゴム又はポリウレタンの少なくとも何れか一方をポリオレフィン樹脂と共に用いることによって、多孔質パイプの柔軟性を高めることができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a porous pipe.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a porous pipe made of a foam has been used as a hose for watering farmland or the like. The porous pipe for watering is watered by the water in the pipe leaching to the outside from the fine holes of the foam. Further, the porous pipe for irrigation is required to have appropriate water permeability, strength and flexibility. As an example of the porous pipe for watering, there is a foamed resin composition mainly composed of a low-viscosity polyethylene-based resin, a high-viscosity polyethylene-based resin, and a polypropylene-based resin (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2001-78592
[Problems to be solved by the invention]
However, in the case of a porous pipe obtained by foaming and molding a resin composition mainly containing the low-viscosity polyethylene resin, the high-viscosity polyethylene resin, and the polypropylene resin, the cell structure is extremely fine, and the water permeability is high. In some cases, and it may be difficult to say that watering is sufficient.
[0005]
The present invention is to provide a porous pipe which can obtain a water permeability suitable for irrigation, has good moldability, and has flexibility required for laying.
[0006]
[Means for Solving the Problems]
The present invention relates to a plurality of pulverized rubber or plastics, at least one pulverized rubber or plastic, and a plurality of pulverized rubbers or plastics combined such that the weighted average value of the melt flow rate is 0.5 to 0.9 g / 10 min. And a kneaded and extruded polyolefin resin.
[0007]
The rubber used as a pulverized product in the present invention may be either natural rubber or synthetic rubber, or both. As the plastic used as a pulverized material in the same manner as the rubber, an appropriate plastic is used, and polyurethane is particularly preferable. The polyurethane may be any of soft, semi-rigid, rigid foam, and polyurethane elastomer, or may be used by mixing them. Particularly, since rubber and polyurethane foams have elasticity, the obtained porous pipe can be given appropriate flexibility. The diameter of the pulverized material is preferably 0.8 to 1.2 mm. If it is too small, it is difficult to obtain the effect of mixing the pulverized material, and if it is too large, the formability of the pipe will be impaired. The amount of the pulverized material is preferably 30 to 50 parts by weight based on 100 parts by weight of the extruded raw material. Further, the pulverized material is different from a preliminarily formed one, and the surface becomes uneven due to pulverization. Therefore, voids are easily generated between the pulverized materials, and the voids improve water permeability. The crushed rubber or plastic may be crushed waste.
[0008]
As the polyolefin resin used in the present invention, a plurality of resins combined so that the weighted average value of the melt flow rate (MFR: based on JIS K7210A method) is 0.5 to 0.9 g / 10 min are used. Examples of usable polyolefin resins include polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-vinyl acetate copolymer, and ethylene produced by a commercially available high-pressure method, medium-pressure method, or low-pressure method. And copolymers of methyl, ethyl, propyl or butyl acrylate (content of this ester; within 45 mol%), or those chlorinated to a chlorine content of 60% by weight. Can be.
[0009]
By setting the weighted average value of the melt flow rate in the polyolefin resin to 0.5 to 0.9 g / 10 min, the polyolefin resin does not easily enter the gaps between the pulverized materials during extrusion molding, and completely closes the gaps. Since the pulverized materials can be bonded to each other without causing any problem, the water permeability generated by the communication of the remaining voids between the pulverized materials can be moderate, and the pulverized materials can be strongly bonded to each other, and the strength of the porous pipe can be sufficiently increased. It can be something. If the weighted average value of the melt flow rate is larger than the above range, the pores are completely closed, so that water permeability cannot be obtained. On the other hand, when the weighted average value of the melt flow rate is smaller than the above range, the water permeability becomes abnormally large. Further, at the time of extrusion molding, the polyolefin resin does not enter the voids between the pulverized materials at all, and the bonding force between the pulverized materials is weakened, and the strength of the obtained porous pipe becomes insufficient. Adhere as.
[0010]
In particular, as the polyolefin resin, from the viewpoints of availability, material cost, and ease of adjusting the weighted average value of the melt flow rate, a linear chain having a melt flow rate of 1.0 to 1.6 g / 10 min is preferred. It is preferable to use a combination of a low-density polyethylene (LLDPE) and a high-density polyethylene (HDPE) having a melt flow rate of 0.05 to 0.16 g / 10 min.
[0011]
In addition to the polyolefin resin, other resins, water, and additives (colorants, physical property improvers, and the like) may be appropriately added.
[0012]
In the production of the porous pipe, at least one of the pulverized rubber or plastic and a plurality of polyolefin resins combined so that the weighted average value of the melt flow rate is 0.5 to 0.9 g / 10 min, This is performed by kneading and extrusion using a known extruder. The obtained porous pipe, while the pulverized material is bonded to each other by the polyolefin resin, constitutes a porous by the gap between the pulverized material, and the gap between the pulverized material is communicated, Exhibits water permeability.
[0013]
【Example】
A crushed product of butadiene rubber or a soft polyurethane foam crushed to 0.8 to 1.2 mm (average particle diameter 1.0 mm) with a crusher, and a melt flow rate (MFR) of 1.0, 1.3, 1. 1. The mixing ratio shown in Table 1 of the linear low-density polyethylene of 6 g / 10 min and the high-density polyethylene of melt flow rate (MFR) of 0.05, 0.1, and 0.16 g / 10 min is shown in Table 1. Parts by weight) and put into an extruder (manufactured by Chubu Kikai Co., Ltd., die diameter 30 mm, cylinder temperature 170 ° C., die temperature 175 ° C., take-up speed 1.3 m / min), kneading and extrusion molding. To 6 (outer diameter 10 mm, wall thickness 2.5 mm). Further, a porous pipe of a comparative example in which the weighted average value of the melt flow rate or the particle size of the pulverized product was out of the range of the present invention was produced by using the same extruder as in the above example. The composition of the comparative example is shown in Table 2. The moldability (adhesion amount of orifice) at the time of production in the above Examples and Comparative Examples is as shown in the lower part of Tables 1 and 2.
[0014]
[Table 1]
[0015]
[Table 2]
[0016]
With respect to the porous pipes of the respective examples and comparative examples obtained as described above, the product appearance and the water permeability were examined. The appearance of the product was visually inspected for the presence or absence of roughening and lack of the surface of the porous pipe. In addition, the water permeability is such that a gutter having a length of 1000 mm is held at an angle of 5 degrees with respect to the horizontal, and the porous pipes of Examples and Comparative Examples are arranged on the gutter, and 0.15 MPa at the upper end of the porous pipe is provided. Water is supplied by pressure, a measuring cup is arranged at the lower end of the gutter, and water leached from the side wall of the porous pipe and flowing down the gutter is received by the measuring cup, and the amount of water per minute Was calculated, and the calculated value was used as the water permeability (cc / m / min) of the porous pipe. The results are shown in Tables 1 and 2 below. The porous pipe of the above example had flexibility and could be easily bent.
[0017]
As can be understood from the results in Tables 1 and 2, the porous pipes of the examples are hardly adhered to the orifices of the extruder at the time of production, and are excellent in mass productivity. Further, the porous pipe of the example had a good appearance, a water permeability of 750 to 880 cc / m / min, and was suitable for watering.
[0018]
【The invention's effect】
As described above, according to the porous pipe of the present invention, at least one of the pulverized rubber and plastic is combined with the melt flow rate so that the weighted average value of the melt flow rate is 0.5 to 0.9 g / 10 min. Since it is obtained by kneading and extruding a plurality of polyolefin resins, water permeability is secured by the gaps between the pulverized materials, and furthermore, the appropriate gaps are not completely closed between the pulverized materials by the polyolefin resin. Since it is formed between the pulverized materials, it is possible to obtain water permeability suitable for watering.
[0019]
In addition, as the polyolefin resin, if a melt flow rate is 1.0 to 1.6 g / 10 min and a low-density polyethylene having a melt flow rate of 0.05 to 0.16 g / 10 min is used, Since the weighted average value of the melt flow rate can be easily set to 0.5 to 0.9 g / 10 min, and a special polyolefin resin does not need to be used, the cost of the porous pipe can be reduced.
[0020]
Further, by setting the diameter of the pulverized material to 0.8 to 1.2 mm, the water permeability can be more reliably made suitable for watering. Furthermore, the flexibility of the porous pipe can be enhanced by using a ground material of the plastic as polyurethane and using at least one of rubber and polyurethane together with a polyolefin resin.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2002315457A JP4208549B2 (en) | 2002-10-30 | 2002-10-30 | Porous pipe |
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JP2002315457A JP4208549B2 (en) | 2002-10-30 | 2002-10-30 | Porous pipe |
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JP2004147543A true JP2004147543A (en) | 2004-05-27 |
JP4208549B2 JP4208549B2 (en) | 2009-01-14 |
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JP2002315457A Expired - Fee Related JP4208549B2 (en) | 2002-10-30 | 2002-10-30 | Porous pipe |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101899179A (en) * | 2010-05-29 | 2010-12-01 | 甘肃大禹节水股份有限公司 | Production technology of special water dropper for preventing root system from being invaded by subsurface drop irrigation |
CN102907294A (en) * | 2012-04-23 | 2013-02-06 | 深圳市鑫康沃科技开发有限公司 | Infiltrating micro-irrigation system |
CN111567369A (en) * | 2020-06-09 | 2020-08-25 | 山东长江节水灌溉科技有限公司 | Rubber-plastic composite longitudinal strip-grid type infiltrating irrigation pipe and preparation method thereof |
-
2002
- 2002-10-30 JP JP2002315457A patent/JP4208549B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101899179A (en) * | 2010-05-29 | 2010-12-01 | 甘肃大禹节水股份有限公司 | Production technology of special water dropper for preventing root system from being invaded by subsurface drop irrigation |
CN102907294A (en) * | 2012-04-23 | 2013-02-06 | 深圳市鑫康沃科技开发有限公司 | Infiltrating micro-irrigation system |
CN111567369A (en) * | 2020-06-09 | 2020-08-25 | 山东长江节水灌溉科技有限公司 | Rubber-plastic composite longitudinal strip-grid type infiltrating irrigation pipe and preparation method thereof |
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JP4208549B2 (en) | 2009-01-14 |
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