JP2018065729A - 植物用液状散布剤 - Google Patents
植物用液状散布剤 Download PDFInfo
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- JP2018065729A JP2018065729A JP2016206763A JP2016206763A JP2018065729A JP 2018065729 A JP2018065729 A JP 2018065729A JP 2016206763 A JP2016206763 A JP 2016206763A JP 2016206763 A JP2016206763 A JP 2016206763A JP 2018065729 A JP2018065729 A JP 2018065729A
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- Prior art keywords
- pva
- meth
- agent
- plant
- vinyl
- Prior art date
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- 238000005507 spraying Methods 0.000 title claims description 23
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 48
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 48
- 229920005989 resin Polymers 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims abstract description 27
- 238000007127 saponification reaction Methods 0.000 claims abstract description 20
- 238000006116 polymerization reaction Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000003898 horticulture Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 abstract 1
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- 239000000178 monomer Substances 0.000 description 12
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- 239000003337 fertilizer Substances 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 8
- 239000003814 drug Substances 0.000 description 8
- 229940079593 drug Drugs 0.000 description 8
- 238000003892 spreading Methods 0.000 description 8
- 239000004480 active ingredient Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003905 agrochemical Substances 0.000 description 5
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- 229920002554 vinyl polymer Polymers 0.000 description 2
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- 125000000008 (C1-C10) alkyl group Chemical group 0.000 description 1
- 125000004169 (C1-C6) alkyl group Chemical group 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
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- 239000004711 α-olefin Substances 0.000 description 1
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Abstract
Description
また、展着効果を示す展着剤として、ポリオキシエチレン脂肪酸エステル、パラフィン等を主成分とするものがあるが、使用濃度を高くしないと効果が発揮されなかったり、乾いた皮膜が水に溶けないため植物体上にいつまでも残留したりする、等の問題がある。さらに、これらの展着剤は、いずれも上記水希釈液中での溶解性が悪く、さらには配合量を多くしないと機能しないという問題もある。
かかる特許文献1に記載のPVAは、ケン化度が88モル%程度で、雨水などで流亡することから、改良が求められるものであった。そこで、ケン化度が30〜60モル%PVA系樹脂を含有する農業用液状散布剤が提案されている(特許文献2参照。)。
そのため、特に、本発明の植物用液状散布剤は、葉面散布剤として好適に用いられる。
以下、本発明について詳細に説明する。
上記特定PVA系樹脂のケン化度は、好ましくは91〜99.5モル%、さらに好ましくは、92〜99モル%、さらには97〜99モル%、特には98〜99モル%である。
かかるケン化度が低すぎると、葉面散布剤として用いた際に、展着性が低下する。なお、上記ケン化度は、JIS K6726に準じて、残存酢酸ビニルの加水分解に要するアルカリ消費量で分析することができる。
かかる変性PVA系樹脂は、ビニルエステル系単量体と他の不飽和単量体との重合体をケン化したり、PVA系樹脂を後変性したりして、製造することができる。
また、3,4−ジヒドロキシ−1−ブテン、3,4−ジアシロキシ−1−ブテン、3−アシロキシ−4−ヒドロキシ−1−ブテン、4−アシロキシ−3−ヒドロキシ−1−ブテン、3,4−ジアシロキシ−2−メチル−1−ブテン、4,5−ジヒドロキシ−1−ペンテン、4,5−ジアシロキシ−1−ペンテン、4,5−ジヒドロキシ−3−メチル−1−ペンテン、4,5−ジアシロキシ−3−メチル−1−ペンテン、5,6−ジヒドロキシ−1−ヘキセン、5,6−ジアシロキシ−1−ヘキセン、グリリンモノアリルエーテル、2,3−ジアセトキシ−1−アリルオキシプロパン、2−アセトキシ−1−アリルオキシ−3−ヒドロキシプロパン、3−アセトキシ−1−アリルオキシ−2−ヒドロキシプロパン、グリセリンモノビニルエーテル、グリセリンモノイソプロペニルエーテル、ビニルエチレンカーボネート、2,2−ジメチル−4−ビニル−1,3−ジオキソラン等のジオールを有する化合物などが挙げられる。これらの単量体は、単独で、又は2種以上を併用してもよい。
変性PVA系樹脂の変性率は、PVA系樹脂の水溶液を損なわない程度であり、通常0.1〜10モル%である。
なお、「部」、[%]などは重量基準である。
<PVA(1)の作製>
還流冷却器、滴下漏斗、撹拌機を備えた反応缶に、酢酸ビニル1000重量部、メタノール345重量部を仕込み、アゾビスイソブチロニトリルを0.07モル%(対仕込み酢酸ビニル)投入し、撹拌しながら窒素気流下で温度を上昇させ、重合を開始した。酢酸ビニルの重合率が89%となった時点で、m−ジニトロベンゼンを所定量添加して重合を終了し、続いて、メタノール蒸気を吹き込みつつ蒸留することで未反応の酢酸ビニル単量体を系外に除去し、共重合体のメタノール溶液を得た。次いで、上記メタノール溶液を、濃度55%に調整してニーダーに仕込み、溶液温度を40℃に保ちながら、水酸化ナトリウムの2%メタノール溶液を共重合体中の酢酸ビニル構造単位1モルに対して2ミリモルとなる割合で加えてケン化を行った。ケン化が進行すると共にケン化物が析出し、粒子状となった時点で、中和用の酢酸を水酸化ナトリウムの0.8当量添加し、濾別、メタノールでよく洗浄して熱風乾燥機中で乾燥し、未変性のPVA(1)を得た。
得られたPVA(1)のケン化度は、残存酢酸ビニルの加水分解に要するアルカリ消費量で分析を行ったところ99モル%であり、平均重合度は、JIS K6726に準拠して分析を行ったところ、500であった。
実施例1において、PVA(1)に変えて、ケン化度93モル%、平均重合度700のPVA(2)を用いた以外は同様に行った。結果を表1に示す。
実施例1において、PVA(1)に変えて、ケン化度49モル%、平均重合度250のPVA(3)を用いた以外は同様に行った。結果を表1に示す。
実施例1において、PVA(1)に変えて、ケン化度34モル%、平均重合度300のPVA(4)を用いた以外は同様に行った。結果を表1に示す。
実施例1において、PVA(1)に変えて、ケン化度88モル%、平均重合度600のPVA(5)を用いた以外は同様に行った。結果を表1に示す。
上記の実施例及び比較例で得られた植物用液状散布剤について、以下の評価を行った。
植物用液状散布剤105部に対し、着色剤(食紅)を0.1部添加した後、植物(ベンジャミンエスタ)の葉面に対し、霧吹きにて植物用液状散布剤を散布した。そして、24時間放置後、その葉面(植物用液状散布剤の散布面)に対し、霧吹きにて水を噴きかけた。そして、落ちずに残った着色面を目視観察し、その着色面が、葉面(植物用液状散布剤の散布面)の面積に対して80%以上残ったものを「○」と評価した。なお、葉面(植物用液状散布剤の散布面)の面積に対して30%以上80%未満残ったものを「△」、30%未満しか残らなかったものを「×」と評価した。
植物用液状散布剤を調製後、4日間室温で静置した。静置後の様子を目視で観察し、分散しているものを「○」、沈殿が生じているものを「×」と評価した。
Claims (3)
- ケン化度が90モル%以上のポリビニルアルコール系樹脂を含有することを特徴とする植物用液状散布剤。
- 上記ポリビニルアルコール系樹脂の平均重合度が、100〜2000であることを特徴とする請求項1記載の植物用液状散布剤。
- 植物用液状散布剤が葉面散布剤である、請求項1又は2記載の植物用液状散布剤。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5375051A (en) * | 1976-12-06 | 1978-07-04 | Nitto Electric Ind Co | Protecting and preservating method of bulbous plant |
| JPS5543038A (en) * | 1978-09-25 | 1980-03-26 | Nisshinbo Ind Inc | Concentrated lime sulfur mixture |
| JPS6438001A (en) * | 1987-08-03 | 1989-02-08 | Kao Corp | Killing agent composition of aqueous suspension |
| JP2002293702A (ja) * | 2001-01-23 | 2002-10-09 | Hokko Chem Ind Co Ltd | 湛水下水田の直接散布用水性懸濁製剤 |
| WO2016027720A1 (ja) * | 2014-08-20 | 2016-02-25 | 日本合成化学工業株式会社 | 農薬分散剤およびこれを用いた農薬分散液 |
-
2016
- 2016-10-21 JP JP2016206763A patent/JP2018065729A/ja active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5375051A (en) * | 1976-12-06 | 1978-07-04 | Nitto Electric Ind Co | Protecting and preservating method of bulbous plant |
| JPS5543038A (en) * | 1978-09-25 | 1980-03-26 | Nisshinbo Ind Inc | Concentrated lime sulfur mixture |
| JPS6438001A (en) * | 1987-08-03 | 1989-02-08 | Kao Corp | Killing agent composition of aqueous suspension |
| JP2002293702A (ja) * | 2001-01-23 | 2002-10-09 | Hokko Chem Ind Co Ltd | 湛水下水田の直接散布用水性懸濁製剤 |
| WO2016027720A1 (ja) * | 2014-08-20 | 2016-02-25 | 日本合成化学工業株式会社 | 農薬分散剤およびこれを用いた農薬分散液 |
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