JPH073042A - Production of highly reflecting film - Google Patents
Production of highly reflecting filmInfo
- Publication number
- JPH073042A JPH073042A JP14619093A JP14619093A JPH073042A JP H073042 A JPH073042 A JP H073042A JP 14619093 A JP14619093 A JP 14619093A JP 14619093 A JP14619093 A JP 14619093A JP H073042 A JPH073042 A JP H073042A
- Authority
- JP
- Japan
- Prior art keywords
- film
- aluminum powder
- thermoplastic resin
- bubbles
- weight
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 20
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 13
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- 230000000694 effects Effects 0.000 abstract description 9
- 241000607479 Yersinia pestis Species 0.000 abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 3
- 241000238631 Hexapoda Species 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 239000010410 layer Substances 0.000 description 15
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 10
- 239000000292 calcium oxide Substances 0.000 description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000000843 powder Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920001684 low density polyethylene Polymers 0.000 description 4
- 239000004702 low-density polyethylene Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000004594 Masterbatch (MB) Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 229920000092 linear low density polyethylene Polymers 0.000 description 3
- 239000004707 linear low-density polyethylene Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 230000002940 repellent Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002362 mulch Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、農業用マルチフィルム
や各種断熱、保温性フィルムなどとして有用な高反射フ
ィルムの製造方法に関し、更に詳しくは該フィルムの製
造過程において熱可塑性樹脂にアルミニウム粉末を高濃
度に添加して製膜する際にみられる気泡の発生を防止す
る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a highly reflective film useful as an agricultural mulch film and various heat insulating and heat retaining films. More specifically, aluminum powder is added to a thermoplastic resin in the process of producing the film. The present invention relates to a method of preventing bubbles from being generated when a film is formed by adding it at a high concentration.
【０００２】[0002]
【従来の技術】従来より、ポリエチレンやポリ塩化ビニ
ル等の熱可塑性樹脂にアルミニウム粉末を添加して製膜
した反射フィルムは、地温の上昇を抑制したり害虫忌避
等の効果を有するため、農業用のマルチングフィルムと
して数多くの提案がなされている。（例えば特開昭５８
−７８５１５号公報、特開昭５８−８０３４７号公報、
特開昭６２−２７２９２８号公報、特公平２−１１２１
０号公報）しかしながら、この種のフィルムに添加され
るアルミニウム粉末は、吸湿しやすく、しかも原料樹脂
との混練の際に粉体が飛散して作業環境を悪化させると
いう問題から、予めミネラルタービンの如きオイルで処
理されたものが用いられる関係上、かかるオイル処理さ
れたアルミニウム粉末を熱可塑性樹脂に添加してフィル
ム成形しようとすると、残留オイルが加熱溶融時にガス
化してフィルム中に気泡となって残り、商品価値を全く
失うばかりか、極端な場合はインフレーション法等によ
るフィルム成形の時点でフィルムに穴が開き、満足に成
形すらできない事態となるなど、こうした現象はアルミ
ニウム粉末添加量が多くなるほど顕著になる傾向があ
る。2. Description of the Related Art Conventionally, a reflection film formed by adding aluminum powder to a thermoplastic resin such as polyethylene or polyvinyl chloride has an effect of suppressing an increase in soil temperature and repelling pests. Many proposals have been made as mulching films for. (For example, JP-A-58
-78515, JP-A-58-80347,
Japanese Patent Laid-Open No. 62-272928, Japanese Patent Publication No. 2-1121
However, the aluminum powder added to this type of film is liable to absorb moisture, and the powder scatters during kneading with the raw material resin to deteriorate the working environment. When an oil-treated aluminum powder is added to a thermoplastic resin to form a film, the residual oil is gasified during heating and melting to form bubbles in the film. Not only does it lose the commercial value at all, but in extreme cases, the film is pierced at the time of film formation by the inflation method, etc., and it becomes impossible to even satisfactorily mold.This phenomenon is remarkable as the amount of aluminum powder added increases. Tends to become.
【０００３】そこで、かかるフィルム成形時の気泡発生
の問題を改善するために、従来より原料を除湿乾燥機な
どで乾燥する方法が一般的に採られているが、この方法
では生産性が悪くコストアップの原因になるほか、原料
中の水分は取り除くことができても残留オイルまでは十
分除去できないことから、フィルム中に発生する気泡を
完全になくすることができなかったのである。Therefore, in order to improve the problem of bubble generation during the film formation, a method of drying the raw material by a dehumidifying dryer has been generally used, but this method has poor productivity and cost. In addition to being a cause of up, it is impossible to completely eliminate the air bubbles generated in the film, because the residual oil cannot be removed sufficiently even though the water in the raw material can be removed.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記事情に鑑
みなされたものであり、その目的とするところは可視光
線の反射率が高く、地温上昇の抑制や害虫忌避効果に優
れたフィルムを気泡が発生することなく安定して製造す
る方法を提供する点にある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to form a film having a high reflectance of visible light, excellent suppression of rise in soil temperature and excellent pest repellent effect. The point is to provide a stable manufacturing method without causing
【０００５】[0005]
【課題を解決するための手段】本発明者等は、熱可塑性
樹脂にアルミニウム粉末を添加して製膜する際にみられ
る気泡発生の問題を改善するために、種々の添加剤処方
について鋭意検討した結果、これまで主にその脱水剤と
しての働きから、炭酸カルシウム等の無機系フィラーを
含有する樹脂組成物の気泡防止剤として専ら使用されて
きた金属酸化物が、意外にも前記したアルミニウム粉末
添加時の残留オイルのガス化による気泡の発生防止に極
めて有効に作用することを見い出し、本発明を完成する
に至ったものである。[Means for Solving the Problems] The inventors of the present invention diligently studied various additive formulations in order to improve the problem of bubble generation that occurs when a film is formed by adding aluminum powder to a thermoplastic resin. As a result, the metal oxide, which has been mainly used as a bubble preventive agent for resin compositions containing an inorganic filler such as calcium carbonate, has surprisingly been used as the aluminum powder. It was found that the present invention is extremely effective in preventing bubbles from being generated due to gasification of residual oil at the time of addition, and has completed the present invention.
【０００６】即ち、本発明は熱可塑性樹脂にアルミニウ
ム粉末を５乃至２０重量％添加し高反射フィルムを製造
する方法において、該熱可塑性樹脂とアルミニウム粉末
に更に金属酸化物を配合して製膜することを特徴とする
高反射フィルムの製造方法に係るものである。That is, the present invention is a method for producing a highly reflective film by adding 5 to 20% by weight of aluminum powder to a thermoplastic resin, in which the thermoplastic resin and the aluminum powder are further mixed with a metal oxide to form a film. The present invention relates to a method for producing a high reflection film, which is characterized in that
【０００７】本発明に用いられる熱可塑性樹脂として
は、フィルム成形が可能なものであれば特に制限はな
く、例えばポリエチレンやエチレン−酢酸ビニル共重合
体などのオレフィン系樹脂、ポリ塩化ビニルなどの塩化
ビニル系樹脂、ポリエチレンテレフタレート、ポリブチ
レンテレフタレートなどのポリエステル系樹脂、アクリ
ル系樹脂、ポリアミド系樹脂、及びこれら樹脂の２種以
上のブレンド物が包含される。このうち、農業用フィル
ムとして用いる場合は、経済性や廃棄処分が容易な点な
どから特に低密度ポリエチレンや直鎖状低密度ポリエチ
レン等のオレフィン系樹脂が好適である。The thermoplastic resin used in the present invention is not particularly limited as long as it can be formed into a film. For example, an olefin resin such as polyethylene or ethylene-vinyl acetate copolymer, or a chloride such as polyvinyl chloride. Vinyl resins, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, acrylic resins, polyamide resins, and blends of two or more of these resins are included. Among them, when used as an agricultural film, an olefin resin such as low density polyethylene or linear low density polyethylene is particularly preferable from the viewpoint of economy and easy disposal.
【０００８】一方、本発明において上記熱可塑性樹脂に
反射特性を付与するために添加されるアルミニウム粉末
としては、平均粒径１乃至３０μ、好ましくは３乃至２
０μの鱗片状、フレーク状もしくは針状のものをいい、
これらをそれぞれ単独又は併用して用いるもので、この
うち鱗片状のアルミニウム粉末はフィルムに高い反射能
を与えるのに役立ち、それ以外の形状のアルミニウム粉
末はフィルムの遮光性を向上させるのに役立つ。On the other hand, in the present invention, the aluminum powder added to impart the reflection characteristics to the thermoplastic resin has an average particle size of 1 to 30 μ, preferably 3 to 2.
0μ scales, flakes or needles
These are used individually or in combination. Among them, the scaly aluminum powder is useful for giving the film high reflectivity, and the aluminum powder having other shapes is useful for improving the light-shielding property of the film.
【０００９】ここで、アルミニウム粉末の添加量は熱可
塑性樹脂に対して５乃至２０重量％、好ましくは７乃至
１５重量％であり、熱可塑性樹脂に対するアルミニウム
粉末の添加量が５重量％未満の場合は反射率が低く、従
って地温上昇の抑制や害虫忌避性等の効果が乏しい。ま
た、アルミニウム粉末の添加量が２０重量％を越えると
それに見合うだけの効果が得られないばかりか、フィル
ム成形時のドローダウン性が悪く、製膜安定性に欠けた
りフィルム強度が弱くなるという問題が生じる。Here, the amount of aluminum powder added is 5 to 20% by weight, preferably 7 to 15% by weight, based on the thermoplastic resin. When the amount of aluminum powder added to the thermoplastic resin is less than 5% by weight. Has a low reflectance, and therefore has little effect on suppressing the rise in soil temperature and pest repellent. Further, if the amount of aluminum powder added exceeds 20% by weight, not only the effect corresponding to it cannot be obtained, but also the drawdown property during film formation is poor, and film formation stability is poor or film strength is weakened. Occurs.
【００１０】また、本発明において気泡の発生を防止す
るために配合される金属酸化物としては、酸化カルシウ
ム、酸化マグネシウム、酸化亜鉛、酸化アルミニウム等
の少なくとも１種が用いられ、中でも酸化カルシウムが
気泡防止効果や安全性、経済性等の点で特に好適であ
る。Further, as the metal oxide compounded in the present invention for preventing the generation of bubbles, at least one kind of calcium oxide, magnesium oxide, zinc oxide, aluminum oxide and the like is used. Among them, calcium oxide is bubbles. It is particularly preferable in terms of prevention effect, safety, economy and the like.
【００１１】かかる金属酸化物の配合量は、熱可塑性樹
脂に対するアルミニウム粉末の添加量や使用するアルミ
ニウム粉末の粒径等によって異なるため一概に決められ
ないが、アルミニウム粉末の添加量が５乃至２０重量％
の場合、通常０．１乃至３重量％が好適で、これより少
ないと気泡の発生防止効果が不十分になる一方、多すぎ
ると反射率や機械的強度が低下するという不都合が生じ
る。また、本発明で用いられる金属酸化物の粒径は小さ
いほど気泡防止効果の点で好ましいが、一般的に３０μ
以下であればよく、中でも１０μ以下のものが特に好適
である。The amount of the metal oxide compounded cannot be unconditionally determined because it varies depending on the amount of the aluminum powder added to the thermoplastic resin and the particle size of the aluminum powder used, but the amount of the aluminum powder added is 5 to 20% by weight. %
In this case, 0.1 to 3% by weight is usually preferable, and if it is less than this range, the effect of preventing bubble generation becomes insufficient, while if it is too large, the reflectance and mechanical strength decrease. Further, the smaller the particle diameter of the metal oxide used in the present invention is, the more preferable in terms of the effect of preventing bubbles.
What is necessary is just that it is below, and especially, what is 10 micrometer or less is especially suitable.
【００１２】尚、本発明では前記した熱可塑性樹脂、ア
ルミニウム粉末及び金属酸化物に更に必要に応じて通常
公知の酸化防止剤、滑剤、防曇剤、着色剤、充填剤等の
各種添加剤を適宜配合してもさしつかえない。In the present invention, the thermoplastic resin, aluminum powder and metal oxides described above may further contain, if necessary, various additives such as known antioxidants, lubricants, antifogging agents, colorants and fillers. It may be added appropriately.
【００１３】本発明は、以上に述べた熱可塑性樹脂、ア
ルミニウム粉末及び金属酸化物等よりなる組成物を押出
機などで溶融混練した後、インフレーション法、Ｔダイ
法、カレンダー法等にてフィルム状に成形し、高反射フ
ィルムとなすのであるが、その際熱可塑性樹脂にアルミ
ニウム粉末や金属酸化物等を混合する方法としては、例
えば二軸混練押出機、熱ロール、バンバリーミキサーな
どを用いて一挙に混練しコンパウンド化する方法や、あ
るいはアルミニウム粉末と金属酸化物をそれぞれ同じ種
類の樹脂にて予めマスターバッチ化したものを所定量熱
可塑性樹脂にドライブレンドする方法が挙げられるが、
フィルムの製造を効率よく行うには後者のマスターバッ
チ化した原料をドライブレンドするのが好ましい。かか
る方法によって製造される高反射フィルムの厚さは、用
途によって多少異なるが、一般的には１０乃至１００μ
であり、そのうち農業用フィルムとして使用する場合は
１０乃至５０μ、好ましくは１５乃至４０μの範囲が適
当である。According to the present invention, the composition comprising the above-mentioned thermoplastic resin, aluminum powder and metal oxide is melt-kneaded by an extruder or the like and then formed into a film by an inflation method, a T-die method, a calender method or the like. It is molded into a high reflection film, and at that time, a method of mixing the aluminum powder, the metal oxide and the like with the thermoplastic resin is performed by using, for example, a twin-screw kneading extruder, a heat roll, a Banbury mixer or the like. There is a method of kneading and compounding, or a method of dry blending a predetermined amount of an aluminum powder and a metal oxide, each of which was previously masterbatched with a resin of the same type, into a thermoplastic resin,
In order to efficiently produce a film, it is preferable to dry-blend the latter masterbatch raw material. The thickness of the high-reflection film produced by such a method is slightly different depending on the use, but is generally 10 to 100 μm.
When used as an agricultural film, the range of 10 to 50 μ, preferably 15 to 40 μ is suitable.
【００１４】また、本発明の高反射フィルムは、そのフ
ィルム構成として基本的には熱可塑性樹脂にアルミニウ
ム粉末及び金属酸化物等を添加した単層のフィルムを指
すのであるが、その他該フィルムの片面あるいは両面に
同種又は異種の熱可塑性樹脂よりなる層を共押出し法、
押出ラミネート法、ドライラミネート法等によって積層
した多層フィルムであってもよく、その場合アルミニウ
ム粉末の添加によって性能低下を余儀なくされるフィル
ム強度や耐候性、耐農薬性等が大幅に改善されるという
優れた利点を奏するものである。尚、ここでフィルム構
成を上記２層又は３層の多層構造とする場合、反射層の
厚さは製膜安定性や反射率などの点でフィルム全厚さの
１０乃至６０％、中でも２０乃至５０％を占めるものが
好ましい。The high-reflection film of the present invention basically means a single-layer film obtained by adding aluminum powder, metal oxide, etc. to a thermoplastic resin as its film constitution. Alternatively, a layer made of the same or different thermoplastic resin is coextruded on both sides,
It may be a multi-layer film laminated by an extrusion laminating method, a dry laminating method or the like, in which case it is excellent in that the strength of the film, the weather resistance, the pesticide resistance, etc., which are inevitably reduced by the addition of aluminum powder, are greatly improved. It has the advantage. When the film structure has a multilayer structure of the above two layers or three layers, the thickness of the reflective layer is 10 to 60% of the total thickness of the film, especially 20 to 20 in terms of film forming stability and reflectance. Those occupying 50% are preferable.
【００１５】[0015]
【実施例】以下、本発明を実施例により更に詳しく説明
するが、本発明はこれらに限定されるものではない。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
【００１６】尚、本発明において行った物性の測定法及
び評価方法は次の通りである。The methods for measuring and evaluating the physical properties used in the present invention are as follows.
【００１７】（１）気泡の有無 製膜後のフィルムについて、目視により気泡の有無を調
べた。(1) Presence / Absence of Bubbles The presence / absence of bubbles in the film after film formation was visually examined.
【００１８】（２）引張強度（単位；ｋｇ／ｃｍ2 ） ＪＩＳＺ１７０２に準じて測定した。(2) Tensile strength (unit: kg / cm 2) Measured according to JISZ1702.
【００１９】（３）伸び（単位；％） ＪＩＳＺ１７０２に準じて測定した。(3) Elongation (unit:%) The elongation was measured according to JISZ1702.
【００２０】（４）反射率（単位；％） 日立分光光度計Ｕ−３５００を用いて波長２５０乃至８
００ｎｍの光線に対する反射率を測定し、その間のピー
ク値をもって反射率とした。(4) Reflectance (unit:%) Using a Hitachi spectrophotometer U-3500, wavelengths 250 to 8
The reflectance for a light beam of 00 nm was measured, and the peak value between them was defined as the reflectance.
【００２１】実施例１〜３、比較例１〜５ 熱可塑性樹脂として直鎖状低密度ポリエチレン原料（Ｍ
Ｉ；０．８、融点；１２２℃、密度；０．９２１）を用
い、これにオイル処理されたアルミニウム粉末を４０重
量％含有する低密度ポリエチレンベースのマスターバッ
チと、酸化カルシウム粉末を５０重量％含有する低密度
ポリエチレンベースのマスターバッチをそれぞれ所定量
づつドライブレンドした後、５０φインフレーション押
出機を用いて押出温度１９０℃、ブローアップ比２．５
の条件でインフレーション成形を行い、アルミニウム粉
末と酸化カルシウム粉末の含有量がそれぞれ３及び０重
量％（比較例１）、７及び０．３５重量％（実施例
１）、１０及び０．５重量％（実施例２）、１８及び
０．９重量％（実施例３）、２４及び１．２重量％（比
較例２）と種々異なる、厚さ２０μのフィルムを作製し
た。Examples 1 to 3, Comparative Examples 1 to 5 Linear low density polyethylene raw material (M
I; 0.8, melting point; 122 ° C., density; 0.921), and a low-density polyethylene-based masterbatch containing 40% by weight of oil-treated aluminum powder, and 50% by weight of calcium oxide powder. Each of the low-density polyethylene-based master batches contained therein was dry-blended in a predetermined amount, and then the extrusion temperature was 190 ° C and the blow-up ratio was 2.5 using a 50φ inflation extruder.
And the content of aluminum powder and calcium oxide powder is 3 and 0% by weight (Comparative Example 1), 7 and 0.35% by weight (Example 1), 10 and 0.5% by weight, respectively. (Example 2), 18 and 0.9% by weight (Example 3), 24 and 1.2% by weight (Comparative Example 2), 20 μm thick films were prepared.
【００２２】また、酸化カルシウム粉末を添加しない以
外はそれぞれ実施例１乃至３と同様の方法によって、比
較例３乃至５のフィルムを作製した。Films of Comparative Examples 3 to 5 were prepared in the same manner as in Examples 1 to 3 except that calcium oxide powder was not added.
【００２３】得られたフィルムについて、気泡の有無、
引張強度、伸び及び反射率等を測定した結果を表１に示
した。About the obtained film, the presence or absence of air bubbles,
The results of measuring tensile strength, elongation, reflectance, etc. are shown in Table 1.
【００２４】[0024]
【表１】 [Table 1]
【００２５】（注）ＡＬ粉末とはアルミニウム粉末を、
またＣＡＯ粉末とは酸化カルシウム粉末をそれぞれ表
す。(Note) AL powder means aluminum powder,
CAO powder represents calcium oxide powder.
【００２６】表１の結果から、本発明の製造方法による
高反射フィルムは、アルミニウム粉末を高濃度に含有す
るにもかかわらず気泡の発生が全くなく、機械的強度や
反射率の点でも優れたものであったが、アルミニウム粉
末の添加量が５重量％未満のもの（比較例１）は酸化カ
ルシウム無添加でも気泡は見られなかったものの、反射
率が非常に低く地温上昇の抑制や害虫忌避効果が期待で
きず、一方アルミニウム粉末の添加量が２０重量％を越
えたもの（比較例２）は強度が弱く、農業用フィルムな
どとしての使用に耐えられるものでなかった。また、酸
化カルシウム粉末を添加しなかったフィルム（比較例
３、４、５）には、多数の気泡が発生し、連続してイン
フレーション成形すら出来ず、物性測定に至らなかっ
た。From the results shown in Table 1, the high reflection film produced by the production method of the present invention did not generate bubbles at all even though it contained aluminum powder in a high concentration, and was excellent in mechanical strength and reflectance. However, in the case where the amount of aluminum powder added was less than 5% by weight (Comparative Example 1), no bubbles were observed even without the addition of calcium oxide, but the reflectance was very low and the suppression of soil temperature rise and pest repellent were suppressed. The effect could not be expected, and on the other hand, the aluminum powder added in an amount of more than 20% by weight (Comparative Example 2) had low strength and could not be used as an agricultural film. Further, in the films to which the calcium oxide powder was not added (Comparative Examples 3, 4, and 5), a large number of bubbles were generated, and even inflation molding could not be continuously performed, and the physical properties could not be measured.
【００２７】実施例４ 二種三層の多層共押出しインフレーション成形機を用い
て、内外層用の押出機には前記実施例１で使用した直鎖
状低密度ポリエチレン原料を、また中間層用の押出機に
は低密度ポリエチレン原料（ＭＩ；１．５、融点；１０
８℃、密度；０．９２３）に前記実施例１で用いたと同
じマスターバッチをそれぞれアルミニウム粉末が１０重
量％、酸化カルシウム粉末が０．５重量％になるようド
ライブレンドした原料を供給し、押出温度１９０℃、ブ
ローアップ比２．７の条件でインフレーション成形を行
うことにより、フィルム厚さ構成が内層／中間層／外層
＝１／１／１で、全厚さ２０μの三層フィルムを作製し
た。Example 4 Using a two-kind three-layer multi-layer coextrusion inflation molding machine, the linear low-density polyethylene raw material used in Example 1 was used for the extruders for the inner and outer layers, and for the intermediate layer. Low density polyethylene raw material (MI; 1.5, melting point; 10
At 8 ° C. and a density of 0.923), the same master batch as used in Example 1 was dry-blended so that the aluminum powder was 10% by weight and the calcium oxide powder was 0.5% by weight, and the mixture was extruded. By performing inflation molding under the conditions of a temperature of 190 ° C. and a blow-up ratio of 2.7, a three-layer film having a film thickness constitution of inner layer / middle layer / outer layer = 1/1/1 and a total thickness of 20 μm was produced. .
【００２８】得られたフィルムには気泡が全く認められ
なかったほか、引張強度が３８０ｋｇ／ｃｍ2 、伸び６
２０％、反射率６２％と高反射フィルムとして優れるも
のであった。No bubbles were observed in the obtained film, the tensile strength was 380 kg / cm 2, and the elongation was 6
It was excellent as a high reflection film with 20% and a reflectance of 62%.
【００２９】比較例６ 中間層に酸化カルシウムを添加しない以外は実施例４と
同様の方法により、三層フィルムの製膜を試みたが、気
泡の発生が著しく、高反射フィルムとしての商品価値を
全く損なうものであった。Comparative Example 6 An attempt was made to form a three-layer film by the same method as in Example 4 except that calcium oxide was not added to the intermediate layer. However, bubbles were remarkably generated and the commercial value as a high reflection film was obtained. It was a total loss.
【００３０】[0030]
【発明の効果】以上の如く、本発明の製造方法によれ
ば、アルミニウム粉末を高濃度に添加した場合に見られ
るフィルム成形時の気泡発生の問題が、金属酸化物の添
加によって見事に解決されたものである。従って、得ら
れるフィルムは高い反射率を有することはもちろん、機
械的強度にも優れたものであるので、農業用のマルチン
グフィルムや各種断熱、保温性のフィルム資材として極
めて有用である。As described above, according to the production method of the present invention, the problem of bubble generation during film forming, which is observed when aluminum powder is added at a high concentration, is excellently solved by the addition of a metal oxide. It is a thing. Therefore, the obtained film has not only a high reflectance but also an excellent mechanical strength, and is extremely useful as a mulching film for agriculture and various heat insulating and heat retaining film materials.
Claims (1)
至２０重量％添加し高反射フィルムを製造する方法にお
いて、該熱可塑性樹脂とアルミニウム粉末に更に金属酸
化物を配合して製膜することを特徴とする高反射フィル
ムの製造方法。1. A method for producing a highly reflective film by adding 5 to 20% by weight of aluminum powder to a thermoplastic resin, wherein the thermoplastic resin and the aluminum powder are further blended with a metal oxide to form a film. And a method for producing a highly reflective film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14619093A JPH073042A (en) | 1993-06-17 | 1993-06-17 | Production of highly reflecting film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14619093A JPH073042A (en) | 1993-06-17 | 1993-06-17 | Production of highly reflecting film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH073042A true JPH073042A (en) | 1995-01-06 |
Family
ID=15402175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14619093A Pending JPH073042A (en) | 1993-06-17 | 1993-06-17 | Production of highly reflecting film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073042A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003038046A (en) * | 2001-07-27 | 2003-02-12 | Mikado Kako Kk | Mulch film for agriculture |
| US20120157230A1 (en) * | 2010-12-20 | 2012-06-21 | Robert Blink | Golf ball layers based on polyalkenamer / ionomer / polyamide blends |
-
1993
- 1993-06-17 JP JP14619093A patent/JPH073042A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003038046A (en) * | 2001-07-27 | 2003-02-12 | Mikado Kako Kk | Mulch film for agriculture |
| US20120157230A1 (en) * | 2010-12-20 | 2012-06-21 | Robert Blink | Golf ball layers based on polyalkenamer / ionomer / polyamide blends |
| US9352193B2 (en) | 2010-12-20 | 2016-05-31 | Acushnet Company | Golf ball layers based on polyalkenamer / ionomer/ polyamide blends |
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