JP2005041700A - Coated granular fertilizer - Google Patents
Coated granular fertilizer Download PDFInfo
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- JP2005041700A JP2005041700A JP2003199654A JP2003199654A JP2005041700A JP 2005041700 A JP2005041700 A JP 2005041700A JP 2003199654 A JP2003199654 A JP 2003199654A JP 2003199654 A JP2003199654 A JP 2003199654A JP 2005041700 A JP2005041700 A JP 2005041700A
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- granular fertilizer
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- fertilizer
- coated granular
- nonionic surfactant
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Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、被覆粒状肥料に関する。
【0002】
【従来の技術】
粒状肥料表面を樹脂組成物で被覆した被覆粒状肥料は、比重が1より大きいにも関わらず樹脂組成物の撥水性のために、水田に施肥した後に水面に浮上しやすいという問題があった。そして、この被覆粒状肥料が施肥後に水面に浮上しやすいという問題を解決するために、これまでにいくつかの技術が開発されてきている(例えば、特許文献1〜3参照)。
【0003】
【特許文献1】
特開昭56−5394号公報
【特許文献2】
特開平10−167868号公報
【特許文献3】
特開2000−128684号公報
【0004】
【発明が解決しようとする課題】
本発明は、ポリウレタン樹脂で被覆された粒状肥料であって、施肥後に湛水され、さらに乾燥される工程が繰り返された後にも水面に浮上し難い被覆粒状肥料を提供するものである。
【0005】
【課題を解決するための手段】
本発明者は、ポリウレタン樹脂で被覆された粒状肥料で、施肥後に湛水され、さらに乾燥される工程が繰り返された後にも水面に浮上し難い被覆粒状肥料を提供するために種々検討を行い、本発明を完成した。即ち、本発明は以下の発明を提供するものである。
【0006】
1.ポリウレタン樹脂で被覆された粒状肥料のポリウレタン樹脂層表面にHLB価が10を超え16未満のノニオン性界面活性剤と、無機微粉体とが、被覆粒状肥料全量に対して0.05〜0.5重量%保持されてなる被覆粒状肥料。
2.ノニオン性界面活性剤がポリオキシアルキレンアルキルエーテルである1.記載の被覆粒状肥料。
3.ノニオン性界面活性剤がポリオキシエチレンアルキルエーテルである1.記載の被覆粒状肥料。
4.無機微粉体がクレイである1.〜3.いずれか1項記載の被覆粒状肥料。
5.ノニオン性界面活性剤と無機微粉体との重量比が4:1〜1:4である請求項1.〜4.いずれか1項記載の被覆粒状肥料。
【0007】
【発明の実施の形態】
本発明の被覆粒状肥料は、ポリウレタン樹脂で被覆された粒状肥料のポリウレタン樹脂層表面にHLB価が10を超え16未満のノニオン性界面活性剤と、無機微粉体とが、被覆粒状肥料全量に対して0.05〜0.5重量%保持されてなるものである。
【0008】
本発明において、HLB価が10を超え16未満のノニオン性界面活性剤としては、例えばHLB価が10を超え16未満のポリオキシアルキレンアルキルエーテル(ポリオキシエチレンアルキルエーテル等)が挙げられ、HLB価が10を超え16未満のポリオキシエチレンセチルエーテル、HLB価が10を超え16未満のポリオキシエチレンラウリルエーテル、及びHLB価が10を超え16未満のポリオキシエチレンオレイルエーテルが挙げられる。
本発明に用いられる界面活性剤のHLB価は10を超え16未満であり、好ましくは13を超え16未満である。
【0009】
本発明において、無機粉体としては、例えばベントナイト、タルク、クレイ(ろう石クレイ等)、炭酸カルシウム、カオリン、及びパーライトが挙げられる。本発明の被覆粒状肥料に用いられる無機粉体の平均粒径は、通常0.1〜10μm、好ましくは0.5〜8.0μmである。
【0010】
本発明において、ポリウレタン樹脂層表面に保持されるノニオン性界面活性剤と無機微粉体との重量比は、通常4:1〜1:4、好ましくは2:1〜1:2の範囲である。
本発明の被覆粒状肥料に保持されるノニオン性界面活性剤及び無機微粉体の量は、被覆粒状肥料全量に対するノニオン性界面活性剤と無機微粉体との合計量で0.05〜0.5重量%、好ましくは0.08〜0.45重量%、更に好ましくは0.1〜0.4重量%である。
【0011】
ポリウレタン樹脂で被覆された粒状肥料のポリウレタン樹脂層表面に、ノニオン性界面活性剤と無機微粉体とを保持させる方法としては、ノニオン性界面活性剤と無機微粉体とのいずれか一方を先に保持させた後に、他方を保持させる方法;予めノニオン性界面活性剤と無機微粉体とを混合した後に保持させる方法のいずれの方法でも可能である。
具体的な操作方法としては、例えば70〜90℃で転動状態にあるポリウレタン樹脂で被覆された粒状肥料に対して、ノニオン性界面活性剤(必要に応じて加熱溶解したもの)を加えて均一になるまで(通常1〜5分間)転動させ、次いで無機粉体を加えてさらに均一になるまで(通常1〜5分間)転動させる方法が挙げられる。
【0012】
本発明において、ポリウレタン樹脂で被覆された粒状肥料は粒状肥料を通常の方法によりウレタン樹脂で被覆したものである。この場合のウレタン樹脂とは、ポリイソシアネート化合物とポリオール化合物とが3次元架橋したものを指す。
【0013】
ここで、粒状肥料とは、肥料成分を含有する粒状物である。
肥料成分とは、水稲等の植物栽培において養分を与えるために土壌に施される窒素、リン、カリウム、珪素、マグネシウム、カルシウム、マンガン、ホウ素等の種々の元素を含有する成分であり、具体的には、尿素、硝酸アンモニウム、硝酸苦土アンモニウム、塩化アンモニウム、硫酸アンモニウム、リン酸アンモニウム、硝酸ソーダ、硝酸カルシウム、硝酸カリウム、石灰窒素、ホルムアルデヒド加工尿素肥料(UF)、アセトアルデヒド加工尿素肥料(CDU)、イソブチルアルデヒド加工尿素肥料(IBDU)、グアニール尿素(GU)等の窒素質肥料;過リン酸石灰、重過リン酸石灰、熔成リン肥、腐植酸リン肥、焼成リン肥、重焼リン、苦土過リン酸、ポリリン酸アンモニウム、メタリン酸カリウム、メタリン酸カルシウム、苦土リン酸、硫リン安、リン硝安カリウム、塩リン安等のリン酸質肥料;塩化カリウム、硫酸カリウム、硫酸カリソーダ、硫酸カリ苦土、重炭酸カリウム、リン酸カリウム等のカリウム質肥料;珪酸カルシウム等の珪酸質肥料;硫酸マグネシウム、塩化マグネシウム等のマグネシウム質肥料;生石灰、消石灰、炭酸カルシウム等のカルシウム質肥料;硫酸マンガン、硫酸苦土マンガン、鉱さいマンガン等のマンガン質肥料;ホウ酸、ホウ酸塩等のホウ素質肥料等の肥料取締法に定められる普通肥料が挙げられる。さらに、これらの肥料成分の複数が混合・化合等された複合肥料を用いることもでき、その例としては、NPK成分型(N−P2O5−K2O)肥料が挙げられ、かかる肥料としては、具体的には例えば、5−5−7(N−P2O5−K2Oの重量比率を意味する。以下同じ。)、12−12−16等の1型平上り型、5−5−5、14−14−14等の2型水平型、6−6−5、8−8−5等の3型平下がり型、4−7−9、6−8−11等の4型上り型、4−7−7、10−20−20等の5型上り平型、4−7−4、6−9−6等の6型山型、6−4−5、14−10−13等の7型谷型、6−5−5、18−11−11等の8型下がり平型、7−6−5、14−12−9等の9型下がり型、3−20−0、18−35−0等の10型NP型、16−0−12、18−0−16等の11型NK型、0−3−14、0−15−15等の12型PK型が挙げられる。
【0014】
これらの粒状肥料には農薬活性化合物を含有させることもできる。
本発明に用いられる粒状肥料の粒径は、製造上の観点から通常1〜5mmの範囲が好ましい。
【0015】
これらの粒状肥料をポリウレタン樹脂で被覆する方法としては、例えばポリイソシアネート化合物、ポリオール化合物、及び必要に応じてアミン系触媒混合してウレタンプレポリマーを調製する工程;転動状態にある粒状肥料に、ウレタン樹脂層の厚さが1〜10μmとなる量の該ウレタンプレポリマーを添加し所定時間転動状態を維持して、粒状肥料表面をポリウレタンプレポリマーで被覆し、熱硬化させてウレタン被覆粒状肥料を得る工程;転動状態にある前記ウレタン被覆粒状肥料に、ウレタン樹脂層の厚さが1〜10μmとなる量の前記ウレタンプレポリマーを添加し所定時間転動状態を維持して、粒状肥料表面をポリウレタンで被覆し、熱硬化させる操作を複数回繰り返す工程を行う方法が挙げられる。
【0016】
粒状肥料をポリウレタン樹脂で被覆する際に用いられるウレタンプレポリマーの総量は、粒状肥料1重量部に対して通常6〜16重量%の割合である。
ここで、熱硬化における硬化とは、一般にいう完全硬化である必要はなく、本発明の粒状肥料被覆用プレポリマーが3次元網目構造をとるように反応してウレタン樹脂に変化する過程で、ゲル化点を過ぎ、曳糸性がなくなった状態を意味する。
【0017】
この場合に用いられるポリイソシアネート化合物としては、例えばトルエンジイソシアネート(以下、TDIと略称することがある)、ジフェニルメタンジイソシアネート(MDIと略称することがある)、ポリメリックMDI、ナフタレンジイソシアネート、トリジンイソシアネート、ヘキサメチレンジイソシアネート、イソホロンジイソシアネート、及びキシリレンジイソシアネートが挙げられ、これらの混合物を用いることもできる。
【0018】
また、ポリオール化合物としては、例えば低分子(炭素数が10以下)の多価アルコール(プロピレングリコール、グリセリン、トリメチロールプロパン、ペンタエリスリトール等)のアルキレンオキサイド(エチレンオキサイド、プロピレンオキサイド等)付加体[ポリエーテル型ポリオール];水酸基を有する脂肪酸のトリグリセリド(イサノ油、ヒマシ油、硬化ヒマシ油等)[ポリエステル型ポリオール];及び水酸基を有する脂肪酸のトリグリセリド(イサノ油、ヒマシ油、硬化ヒマシ油等)のアルキレンオキサイド(エチレンオキサイド、プロピレンオキサイド等)付加体[ポリエステルポリエーテル型ポリオール]が挙げられる。
【0019】
さらに、アミン触媒としては、例えばトリエチレンジアミン、N−メチルモルホリン、2,6−ジメチルモルホリン、1,8−ジアザビシクロ[5.4.0]ウンデック−7−エン、イミダゾール、2−エチル−4−メチルイミダゾール、1,4−ジアザビシクロ[2.2.2]オクタン、及び2,4,6−トリス(ジメチルアミノメチル)フェノールが挙げられる。使用されるアミン触媒の量は、ポリイソシアネート化合物とポリオール化合物との合計量に対して、通常0.05〜5重量%である。
【0020】
使用するポリイソシアネート化合物に由来するNCO基とポリオール化合物に由来するOH基の当量比、いわゆるNCO/OHは、通常0.9〜1.2になるよう調整される。
【0021】
本発明の被覆粒状肥料は、水田で用いることができ、また畑で用いることもできる。
【0022】
【実施例】
以下、製造例、試験例等により本発明をさらに詳しく説明するが、本発明はこれらの例に限定されるものではない。
【0023】
製造例1
温度制御可能な転動型の被覆装置に粒状尿素(平均粒径3.1mm)5kgを仕込んだ。被覆装置の回転部を20〜30rpmで回転させ、仕込んだ粒状尿素を転動状態にした。該粒状尿素の温度を70℃になるまで加熱してから、ポリメリックMDI[住化バイエルウレタン株式会社製、商品名:スミジュール44V10、分子中のNCO基の重量百分率:31%]11.8g、分岐ポリエーテルポリオール[住化バイエルウレタン株式会社製、商品名:スミフェンTM、水酸基価372mg/g]13.1g、並びに2,4,6−トリス(ジメチルアミノメチル)フェノール0.3gを混合して得られた未硬化ウレタン樹脂組成物を添加し、3分間転動させた。続いて、ここに、前記と同じ組成の未硬化ウレタン樹脂組成物を添加し、3分間転動させる操作を15回繰り返し、さらに前記と同じ組成の未硬化ウレタン樹脂組成物を添加して、74℃で3分間転動させた。
次いで、ポリオキシエチレンオレイルエーテル[東邦化学(株)製、商品名:ペグノールO−16、HLB価14.5]7.5gを加え、3分間転動させた。その後、ろう石クレイ[昭和鉱業(株)製、商品名:特雪カットクレー]7.5gを添加して、3分間転動させ、本発明の被覆粒状肥料を得た。
【0024】
製造例2
ポリオキシエチレンオレイルエーテル[東邦化学(株)製、商品名:ペグノールO−16、HLB価14.5]7.5gに代えて、ポリオキシエチレンセチルエーテル[東邦化学(株)製、商品名:ペグノールC−18、HLB価15.3]7.5gを用いた以外は製造例1と同様にして、本発明の被覆粒状肥料を得た。
【0025】
参考例
温度制御可能な転動型の被覆装置に粒状尿素(平均粒径3.1mm)5kgを仕込んだ。被覆装置の回転部を20〜30rpmで回転させ、仕込んだ粒状尿素を転動状態にした。該粒状尿素の温度を70℃になるまで加熱してから、ポリメリックMDI[住化バイエルウレタン株式会社製、商品名:スミジュール44V10、分子中のNCO基の重量百分率:31%]11.8g、分岐ポリエーテルポリオール[住化バイエルウレタン株式会社製、商品名:スミフェンTM、水酸基価372mg/g]13.1g、並びに2,4,6−トリス(ジメチルアミノメチル)フェノール0.3gを混合して得られた未硬化ウレタン樹脂組成物を添加し、3分間転動させた。続いて、ここに、前記と同じ組成の未硬化ウレタン樹脂組成物を添加し、3分間転動させる操作を15回繰り返し、さらに前記と同じ組成の未硬化ウレタン樹脂組成物を添加して、74℃で3分間転動させてポリウレタン樹脂で被覆された粒状肥料を得た。
【0026】
試験例
試験用粒状肥料100個を内径100mm、深さ43mm、16メッシュの篩に入れ、これを水に静かに浸し、1分間静置した後に水面上に浮いている粒状肥料の個数を数えた。その後、静かに篩を持ち上げ、室温で1時間放置した。次いで、これを水に静かに浸し、1分間静置した後に水面上に浮いている粒状肥料の個数を数えた。この操作を8回繰り返した。浮上していた粒状肥料の数から次式により被覆肥料の浮上率を求めた。
【0027】
浮上率(%)=100×(浮上していた粒状肥料の数)/(試験用粒状肥料の数)
結果を表1に示す。
【0028】
【表1】
【0029】
【発明の効果】
本発明の被覆粒状肥料は、施肥後に湛水され、さらに乾燥される工程が繰り返された後も水面に浮上し難いものである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coated granular fertilizer.
[0002]
[Prior art]
The coated granular fertilizer whose granular fertilizer surface is coated with a resin composition has a problem that it tends to float on the water surface after being applied to paddy fields because of the water repellency of the resin composition, even though the specific gravity is greater than 1. In order to solve the problem that this coated granular fertilizer tends to float on the water surface after fertilization, several techniques have been developed so far (see, for example, Patent Documents 1 to 3).
[0003]
[Patent Document 1]
JP 56-5394 A [Patent Document 2]
JP-A-10-167868 [Patent Document 3]
JP 2000-128684 A [0004]
[Problems to be solved by the invention]
The present invention provides a granular fertilizer coated with a polyurethane resin, which is difficult to float on the water surface even after the steps of watering after fertilization and further drying are repeated.
[0005]
[Means for Solving the Problems]
The present inventor is a granular fertilizer coated with a polyurethane resin, performs various studies in order to provide a coated granular fertilizer that is difficult to float on the water surface even after the process of being flooded after fertilization and further dried is repeated, The present invention has been completed. That is, the present invention provides the following inventions.
[0006]
1. A nonionic surfactant having an HLB value of more than 10 and less than 16 and an inorganic fine powder on the surface of the polyurethane resin layer of the granular fertilizer coated with polyurethane resin is 0.05 to 0.5 based on the total amount of the coated granular fertilizer. Coated granular fertilizer that is retained by weight percent.
2. 1. the nonionic surfactant is a polyoxyalkylene alkyl ether The coated granular fertilizer described.
3. 1. The nonionic surfactant is a polyoxyethylene alkyl ether The coated granular fertilizer described.
4). 1. The inorganic fine powder is clay. ~ 3. The coated granular fertilizer according to any one of claims.
5. The weight ratio of the nonionic surfactant to the inorganic fine powder is 4: 1 to 1: 4. ~ 4. The coated granular fertilizer according to any one of claims.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the coated granular fertilizer of the present invention, the nonionic surfactant having an HLB value of more than 10 and less than 16 on the surface of the polyurethane resin layer of the granular fertilizer coated with polyurethane resin, and the inorganic fine powder are based on the total amount of the coated granular fertilizer. 0.05 to 0.5% by weight.
[0008]
In the present invention, examples of the nonionic surfactant having an HLB value of more than 10 and less than 16 include polyoxyalkylene alkyl ethers (polyoxyethylene alkyl ether and the like) having an HLB value of more than 10 and less than 16, such as an HLB value. And polyoxyethylene cetyl ether having an HLB value of more than 10 and less than 16, and polyoxyethylene oleyl ether having an HLB value of more than 10 and less than 16.
The HLB value of the surfactant used in the present invention is more than 10 and less than 16, preferably more than 13 and less than 16.
[0009]
In the present invention, examples of the inorganic powder include bentonite, talc, clay (such as wax stone clay), calcium carbonate, kaolin, and pearlite. The average particle size of the inorganic powder used in the coated granular fertilizer of the present invention is usually 0.1 to 10 μm, preferably 0.5 to 8.0 μm.
[0010]
In the present invention, the weight ratio of the nonionic surfactant retained on the surface of the polyurethane resin layer to the inorganic fine powder is usually in the range of 4: 1 to 1: 4, preferably 2: 1 to 1: 2.
The amount of the nonionic surfactant and the inorganic fine powder retained in the coated granular fertilizer of the present invention is 0.05 to 0.5 weight as the total amount of the nonionic surfactant and the inorganic fine powder with respect to the total amount of the coated granular fertilizer. %, Preferably 0.08 to 0.45% by weight, more preferably 0.1 to 0.4% by weight.
[0011]
As a method of retaining the nonionic surfactant and the inorganic fine powder on the surface of the polyurethane resin layer of the granular fertilizer coated with polyurethane resin, either the nonionic surfactant or the inorganic fine powder is retained first. Either of the following methods can be used: a method of holding the other after the mixing; a method of holding the nonionic surfactant and the inorganic fine powder after mixing them in advance.
As a specific operation method, for example, a nonionic surfactant (which is heated and dissolved as necessary) is uniformly added to a granular fertilizer coated with a polyurethane resin in a rolling state at 70 to 90 ° C. Rolling (until (usually 1 to 5 minutes)), and then adding inorganic powder and rolling until uniform (usually 1 to 5 minutes).
[0012]
In the present invention, the granular fertilizer coated with a polyurethane resin is a granular fertilizer coated with a urethane resin by an ordinary method. The urethane resin in this case refers to a three-dimensionally crosslinked polyisocyanate compound and polyol compound.
[0013]
Here, the granular fertilizer is a granular material containing a fertilizer component.
A fertilizer component is a component containing various elements such as nitrogen, phosphorus, potassium, silicon, magnesium, calcium, manganese, and boron that are applied to soil to provide nutrients in plant cultivation such as paddy rice. For example, urea, ammonium nitrate, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, sodium nitrate, calcium nitrate, potassium nitrate, lime nitrogen, formaldehyde processed urea fertilizer (UF), acetaldehyde processed urea fertilizer (CDU), isobutyraldehyde Nitrogenous fertilizers such as processed urea fertilizer (IBDU) and guaneaure urea (GU); superphosphate lime, heavy superphosphate lime, molten phosphorus fertilizer, humic phosphate fertilizer, calcined phosphorus fertilizer, heavy calcined phosphorus, bitter soil excess Phosphoric acid, ammonium polyphosphate, potassium metaphosphate, calcium metaphosphate, clay Phosphate fertilizers such as acid, phosphorous sulfate, potassium phosphate, ammonium phosphate; potassium fertilizers such as potassium chloride, potassium sulfate, potassium sulfate, potassium sulfate clay, potassium bicarbonate, potassium phosphate; calcium silicate Silicic fertilizers such as magnesium sulfate; magnesium fertilizers such as magnesium chloride; calcium fertilizers such as quick lime, slaked lime and calcium carbonate; manganese fertilizers such as manganese sulfate, sulfated manganese manganese and mineral manganese; boric acid, boric acid Ordinary fertilizers stipulated in the Fertilizer Control Law such as salty boron fertilizers. Furthermore, a compound fertilizer in which a plurality of these fertilizer components are mixed and compounded can also be used. Examples thereof include NPK component type (NP 2 O 5 -K 2 O) fertilizer, and such fertilizer Specifically, for example, 5-5-7 (meaning a weight ratio of N—P 2 O 5 —K 2 O; the same shall apply hereinafter), 12-12-16, etc. 2-5 horizontal type such as 5-5-5, 14-14-14, 3 type flat-down type such as 6-6-5, 8-8-5, 4-7-9, 6-8-11 etc. 4 type ascending type, 4-7-7, 10-20-20 etc. 5 type ascending flat type, 4-7-4, 6-9-6 etc. 6 type mountain type, 6-4-5, 14- 7 type valley type such as 10-13, 8 type falling flat type such as 6-5-5 and 18-11-11, 9 type falling type such as 7-6-5 and 14-12-9, 3-20 -0, 18-35-0, etc. 10 type NP type, 11 type NK types such 16-0-12,18-0-16 include 12-inch PK types such 0-3-14,0-15-15.
[0014]
These granular fertilizers can also contain an agrochemical active compound.
The particle size of the granular fertilizer used in the present invention is usually preferably in the range of 1 to 5 mm from the viewpoint of production.
[0015]
As a method of coating these granular fertilizers with a polyurethane resin, for example, a step of preparing a urethane prepolymer by mixing a polyisocyanate compound, a polyol compound, and, if necessary, an amine-based catalyst; a granular fertilizer in a rolling state, The urethane prepolymer in an amount of 1 to 10 μm in thickness of the urethane resin layer is added and the rolling state is maintained for a predetermined time, and the surface of the granular fertilizer is coated with the polyurethane prepolymer and thermally cured to obtain the urethane-coated granular fertilizer. A step of obtaining a surface of the granular fertilizer by adding the urethane prepolymer in an amount such that the thickness of the urethane resin layer is 1 to 10 μm to the urethane-coated granular fertilizer in a rolling state and maintaining the rolling state for a predetermined time. The method of performing the process which coat | covers with polyurethane and heat-hardens several times is mentioned.
[0016]
The total amount of urethane prepolymer used when the granular fertilizer is coated with a polyurethane resin is usually 6 to 16% by weight with respect to 1 part by weight of the granular fertilizer.
Here, the curing in thermosetting does not necessarily need to be complete curing in general, and is a process in which the granular fertilizer coating prepolymer of the present invention reacts to take a three-dimensional network structure and changes into a urethane resin. It means a state that has passed the turning point and has no spinnability.
[0017]
Examples of the polyisocyanate compound used in this case include toluene diisocyanate (hereinafter sometimes abbreviated as TDI), diphenylmethane diisocyanate (sometimes abbreviated as MDI), polymeric MDI, naphthalene diisocyanate, tolidine isocyanate, hexamethylene diisocyanate. , Isophorone diisocyanate, and xylylene diisocyanate, and a mixture thereof can also be used.
[0018]
Examples of the polyol compound include adducts of alkylene oxides (ethylene oxide, propylene oxide, etc.) of low molecular weight (10 or less carbon atoms) polyhydric alcohols (propylene glycol, glycerin, trimethylolpropane, pentaerythritol, etc.) [poly Ether type polyol]; Triglyceride of fatty acid having a hydroxyl group (Isano oil, castor oil, hydrogenated castor oil, etc.) [Polyester type polyol]; and alkylene of triglyceride of fatty acid having a hydroxyl group (Isano oil, castor oil, hydrogenated castor oil, etc.) Oxide (ethylene oxide, propylene oxide, etc.) adduct [polyester polyether type polyol] can be mentioned.
[0019]
Furthermore, examples of the amine catalyst include triethylenediamine, N-methylmorpholine, 2,6-dimethylmorpholine, 1,8-diazabicyclo [5.4.0] undec-7-ene, imidazole, and 2-ethyl-4-methyl. Examples include imidazole, 1,4-diazabicyclo [2.2.2] octane, and 2,4,6-tris (dimethylaminomethyl) phenol. The amount of the amine catalyst used is usually 0.05 to 5% by weight based on the total amount of the polyisocyanate compound and the polyol compound.
[0020]
The equivalent ratio of NCO groups derived from the polyisocyanate compound to be used and OH groups derived from the polyol compound, so-called NCO / OH, is usually adjusted to be 0.9 to 1.2.
[0021]
The coated granular fertilizer of the present invention can be used in paddy fields and can also be used in fields.
[0022]
【Example】
Hereinafter, the present invention will be described in more detail with reference to production examples, test examples, and the like, but the present invention is not limited to these examples.
[0023]
Production Example 1
5 kg of granular urea (average particle diameter: 3.1 mm) was charged in a rolling type coating apparatus capable of controlling the temperature. The rotating part of the coating apparatus was rotated at 20 to 30 rpm, and the charged granular urea was brought into a rolling state. After heating the temperature of the granular urea to 70 ° C., polymeric MDI [manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumidur 44V10, weight percentage of NCO group in the molecule: 31%] 11.8 g, Branched polyether polyol [manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumifene TM, hydroxyl value 372 mg / g] 13.1 g and 2,4,6-tris (dimethylaminomethyl) phenol 0.3 g were mixed. The obtained uncured urethane resin composition was added and rolled for 3 minutes. Subsequently, an uncured urethane resin composition having the same composition as described above was added and the operation of rolling for 3 minutes was repeated 15 times, and an uncured urethane resin composition having the same composition as described above was further added, and 74 Rolled at 3 ° C. for 3 minutes.
Next, 7.5 g of polyoxyethylene oleyl ether [manufactured by Toho Chemical Co., Ltd., trade name: Pegnol O-16, HLB value 14.5] was added and rolled for 3 minutes. Thereafter, 7.5 g of wax stone clay [made by Showa Mining Co., Ltd., trade name: special snow cut clay] was added and rolled for 3 minutes to obtain the coated granular fertilizer of the present invention.
[0024]
Production Example 2
In place of 7.5 g of polyoxyethylene oleyl ether [manufactured by Toho Chemical Co., Ltd., trade name: Pegnol O-16, HLB value 14.5], polyoxyethylene cetyl ether [manufactured by Toho Chemical Co., Ltd., trade name: The coated granular fertilizer of the present invention was obtained in the same manner as in Production Example 1 except that 7.5 g of pegnol C-18, HLB value 15.3] was used.
[0025]
Reference Example 5 kg of granular urea (average particle diameter: 3.1 mm) was charged into a rolling type coating apparatus capable of controlling the temperature. The rotating part of the coating apparatus was rotated at 20 to 30 rpm, and the charged granular urea was brought into a rolling state. After heating the temperature of the granular urea to 70 ° C., polymeric MDI [manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumidur 44V10, weight percentage of NCO group in the molecule: 31%] 11.8 g, Branched polyether polyol [manufactured by Sumika Bayer Urethane Co., Ltd., trade name: Sumifene TM, hydroxyl value 372 mg / g] 13.1 g and 2,4,6-tris (dimethylaminomethyl) phenol 0.3 g were mixed. The obtained uncured urethane resin composition was added and rolled for 3 minutes. Subsequently, an uncured urethane resin composition having the same composition as described above was added and the operation of rolling for 3 minutes was repeated 15 times, and an uncured urethane resin composition having the same composition as described above was further added, and 74 Rolled at 3 ° C. for 3 minutes to obtain a granular fertilizer coated with polyurethane resin.
[0026]
Test Example 100 granular fertilizers for test were put into a sieve having an inner diameter of 100 mm, a depth of 43 mm, and 16 mesh, and this was gently dipped in water and allowed to stand for 1 minute, and then the number of granular fertilizers floating on the water surface was counted. . Thereafter, the sieve was gently lifted and left at room temperature for 1 hour. Next, this was gently immersed in water and allowed to stand for 1 minute, and then the number of granular fertilizers floating on the water surface was counted. This operation was repeated 8 times. The floating rate of the coated fertilizer was obtained from the number of granular fertilizers that had floated by the following formula.
[0027]
Floating rate (%) = 100 × (number of floating granular fertilizers) / (number of granular test fertilizers)
The results are shown in Table 1.
[0028]
[Table 1]
[0029]
【The invention's effect】
The coated granular fertilizer of the present invention is difficult to float on the water surface even after the process of being flooded after fertilization and further dried.
Claims (5)
Priority Applications (1)
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JP2003199654A JP2005041700A (en) | 2003-07-22 | 2003-07-22 | Coated granular fertilizer |
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JP2003199654A JP2005041700A (en) | 2003-07-22 | 2003-07-22 | Coated granular fertilizer |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2016527168A (en) * | 2013-06-21 | 2016-09-08 | エレメンタル ダイジェスト リミテッド | Treatment of organic waste |
US11370719B2 (en) | 2017-09-13 | 2022-06-28 | Lg Chem, Ltd. | Controlled-release type fertilizer with decreased floating property comprising tri-block copolymer and method for preparing the same |
US11377395B2 (en) | 2017-09-13 | 2022-07-05 | Lg Chem, Ltd. | Controlled-release type fertilizer with decreased floating property comprising polyoxyethylene alky(-aryl) ether and method for preparing the same |
-
2003
- 2003-07-22 JP JP2003199654A patent/JP2005041700A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016527168A (en) * | 2013-06-21 | 2016-09-08 | エレメンタル ダイジェスト リミテッド | Treatment of organic waste |
US11370719B2 (en) | 2017-09-13 | 2022-06-28 | Lg Chem, Ltd. | Controlled-release type fertilizer with decreased floating property comprising tri-block copolymer and method for preparing the same |
US11377395B2 (en) | 2017-09-13 | 2022-07-05 | Lg Chem, Ltd. | Controlled-release type fertilizer with decreased floating property comprising polyoxyethylene alky(-aryl) ether and method for preparing the same |
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