JP2001328891A - Method for producing granular, coated fertilizer - Google Patents
Method for producing granular, coated fertilizerInfo
- Publication number
- JP2001328891A JP2001328891A JP2001066313A JP2001066313A JP2001328891A JP 2001328891 A JP2001328891 A JP 2001328891A JP 2001066313 A JP2001066313 A JP 2001066313A JP 2001066313 A JP2001066313 A JP 2001066313A JP 2001328891 A JP2001328891 A JP 2001328891A
- Authority
- JP
- Japan
- Prior art keywords
- fertilizer
- granular
- resin
- urethane resin
- coated
- 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
Landscapes
- Glanulating (AREA)
- Fertilizers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ウレタン樹脂によ
り被覆された緩効性（徐放性と言うこともある）粒状被
覆肥料の製造方法および該方法により得られる粒状被覆
肥料に関する。TECHNICAL FIELD The present invention relates to a method for producing a slow-acting (sometimes referred to as sustained-release) granular coated fertilizer coated with a urethane resin, and a granular coated fertilizer obtained by the method.
【０００２】[0002]
【従来の技術】近年、農業就労者の高年齢化、就労者数
の減少、兼業農家の増加から、より省力型で植物の成長
にあわせ所定の時期に溶出する肥効調節型肥料が要求さ
れている。このような背景から、種々の肥効調整型肥料
が提案され実用化されている。粒状肥料を熱可塑性樹脂
と高吸水性樹脂で被覆し、肥料の溶出速度を加速制御す
る緩効性粒状肥料については、例えば、特開平９−３０
９７８５号公報、特開平１０−７２２７２号公報に記載
されている。被覆材がウレタン樹脂である被覆肥料につ
いては、特開平１０−２９１８８１号公報において、尿
素肥料表面に高吸水性樹脂と未硬化状態のウレタン樹脂
を混合し被覆する方法、および、尿素肥料表面に高吸水
性樹脂と未硬化状態のウレタン樹脂を混合被覆した後、
未硬化状態のウレタン樹脂のみを被覆する方法により、
初期の溶出を押えたシグモイドタイプの溶出を示すこと
が記載されている。2. Description of the Related Art In recent years, with the aging of agricultural workers, the decrease in the number of workers, and the increase in part-time farmers, there has been a demand for more labor-saving and fertilizer-controlling fertilizers that elute at a predetermined time according to plant growth. ing. From such a background, various fertilizer-adjustable fertilizers have been proposed and put into practical use. A slow-release granular fertilizer in which a granular fertilizer is coated with a thermoplastic resin and a superabsorbent resin to accelerate and control the dissolution rate of the fertilizer is disclosed in, for example, JP-A-9-30.
No. 9785, and JP-A-10-72272. Japanese Unexamined Patent Publication (Kokai) No. 10-218881 discloses a method of coating and mixing a highly water-absorbent resin and an uncured urethane resin on the surface of a urea fertilizer, and a method for coating a fertilizer with an uncured urethane resin. After mixing and coating the water absorbent resin and the uncured urethane resin,
By coating only the uncured urethane resin,
It is described to show a sigmoid-type elution that suppressed the initial elution.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、高吸水
性樹脂と未硬化状態のウレタン樹脂を混合後、肥料表面
を被覆する方法や肥料表面を高吸水性樹脂と未硬化状態
のウレタン樹脂を混合被覆した後、さらに未硬化状態の
ウレタン樹脂のみを被覆する方法は、高吸水性樹脂のみ
で被覆された微粒物が多量に生成され、この微粒物の生
成により、単に高吸水性樹脂のロスによる溶出加速効果
の低下だけでなく、例えば、水田に施肥した場合、吸水
した多量の微粒物が浮上する等の問題を引き起こす。ま
た、一般に高吸水性物質を使用せずに溶出速度を上げる
為には、被覆樹脂の膜厚を薄くする必要があるが膜厚を
薄くしすぎると、完全に均一な被覆の形成が困難とな
り、ピンホール等の欠陥が生成し易く、また運搬、貯蔵
および施肥時等に機械的な力が加わることによる被膜欠
陥も生じ易くなる。このような不均一な被膜または欠陥
を持つ被膜を含む被覆肥料は、精密な溶出制御が困難で
あり、工業的に安定した品質の製品の歩留まりが小さく
なる等の問題がある。本発明の目的は、高吸水性樹脂を
ロスなく使用して、高吸水性樹脂由来の微粒物の生成が
少なく、かつ、水中に入れた時の浮遊物が少なく、均一
な被膜を得ることができ、常温から低温、特に低温でコ
ンスタントに短期間に肥料成分を溶出させることができ
る緩効性被覆肥料の製造方法を提供することにある。However, after mixing the highly water-absorbent resin and the uncured urethane resin, a method of coating the surface of the fertilizer or mixing and coating the fertilizer surface with the highly water-absorbent resin and the uncured urethane resin. After that, the method of coating only the urethane resin in the uncured state further generates a large amount of fine particles coated only with the superabsorbent resin, and the generation of the fine particles simply causes elution due to loss of the superabsorbent resin. Not only is the acceleration effect reduced, but when fertilizing a paddy field, for example, it causes problems such as the floating of a large amount of absorbed fine particles. Generally, in order to increase the dissolution rate without using a superabsorbent material, it is necessary to reduce the thickness of the coating resin, but if the thickness is too small, it becomes difficult to form a completely uniform coating. In addition, defects such as pinholes and the like easily occur, and film defects due to the application of mechanical force during transportation, storage, and fertilization are also likely to occur. Coated fertilizers containing such non-uniform coatings or coatings with defects have problems in that precise elution control is difficult and the yield of products of industrially stable quality is reduced. An object of the present invention is to use a superabsorbent resin without loss, to reduce the generation of fine particles derived from the superabsorbent resin, and to reduce the amount of suspended matter when placed in water, and to obtain a uniform coating. It is an object of the present invention to provide a method for producing a slow-acting coated fertilizer which can elute fertilizer components in a short period of time at normal temperature to low temperature, particularly at low temperature.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意検討したところ、粒状肥料に高吸
水性物質を添加後、ウレタン樹脂被膜にて被覆した粒状
被覆肥料が、高吸水性樹脂由来の微粒物の生成が少な
く、かつ、水中に入れた時の浮遊物が少なく、常温から
低温でコンスタントに短期間に肥料成分を溶出させるこ
とができることを見出し、本発明を完成するに至った。Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and found that after adding a superabsorbent substance to granular fertilizer, the granular coated fertilizer coated with a urethane resin film is Completed the present invention, finding that the generation of fine particles derived from the superabsorbent resin is small, and that the amount of suspended solids when placed in water is small, and that fertilizer components can be eluted in a short period of time from room temperature to low temperature constantly. I came to.
【０００５】すなわち、本発明は、以下の１〜５に関す
る。 １．粒状肥料に高吸水性物質を添加後、ウレタン樹脂か
らなる少なくとも１層の被膜で被覆させることを特徴と
する粒状被覆肥料の製造方法。 ２．下記（１）〜（５）の工程を備える１に記載の方
法。 （１）粒状肥料に高級水性物質を添加する工程 （２）高吸水性物質を添加した粒状肥料を転動状態にす
る工程 （３）該転動状態にある粒状肥料に層厚が１〜１０μｍ
になる量の液状の未硬化ウレタン樹脂を添加する工程 （４）該粒状肥料の転動状態を維持し、各肥料粒子表面
を該未硬化ウレタン樹脂で被覆する工程 （５）該粒状肥料の転動状態を維持し、該未硬化ウレタ
ン樹脂を熱硬化させる工程 ３．（２）〜（５）の工程をこの順に２回またはそれ以
上繰り返す２に記載の方法。 ４．高吸水性物質が、アクリル酸塩系重合体、アクリル
酸−ビニルアルコール共重合体、イソブチレン系重合
体、エチレンオキサイド重合体、プロピレンオキサイド
重合体、エチレンオキサイド−プロピレンオキサイド共
重合体、ポリエチレンオキサイド変性樹脂、澱粉グラフ
ト重合体、澱粉、カルボキシメチルセルロース、カルボ
キシメチルセルロース金属塩、ポリビニルアルコールま
たはベントナイトである１〜３のいずれかに記載の製造
方法。 ５．１〜４のいずれかに記載の方法で製造される粒状被
覆肥料。That is, the present invention relates to the following 1 to 5. 1. A method for producing a granular coated fertilizer, comprising adding a superabsorbent substance to a granular fertilizer and coating the granular fertilizer with at least one layer of a urethane resin. 2. The method according to 1, comprising the following steps (1) to (5). (1) Step of adding a high-grade aqueous substance to the granular fertilizer (2) Step of turning the granular fertilizer to which the superabsorbent substance has been added (3) Layer thickness of the granular fertilizer in the rolling state is 1 to 10 μm
(4) maintaining the rolling state of the granular fertilizer and coating the surface of each fertilizer particle with the uncured urethane resin; and (5) rolling the granular fertilizer. 2. a step of maintaining the moving state and thermally curing the uncured urethane resin; 3. The method according to 2, wherein the steps (2) to (5) are repeated twice or more in this order. 4. The superabsorbent material is an acrylate polymer, acrylic acid-vinyl alcohol copolymer, isobutylene polymer, ethylene oxide polymer, propylene oxide polymer, ethylene oxide-propylene oxide copolymer, polyethylene oxide-modified resin 4. The production method according to any one of 1 to 3, which is a starch graft polymer, starch, carboxymethyl cellulose, carboxymethyl cellulose metal salt, polyvinyl alcohol or bentonite. 5. A granular coated fertilizer produced by the method according to any one of items 1 to 4.
【０００６】[0006]
【発明の実施の形態】次に、本発明を詳しく説明する。
本発明において粒状肥料に高吸水性物質を添加する場
合、粒状肥料に高吸水性樹脂を添加し、肥料表面に均一
分散することが望ましく、その方法としては、それぞれ
の加工に適した温度まで粒状肥料を加熱して高吸水性物
質を添加後、転動状態にして均一分散する方法、また
は、それぞれの加工に適した温度まで粒状肥料を加熱し
ながら転動状態にある粒状肥料に高吸水性物質を添加し
て均一分散する方法がある。それぞれの転動状態にする
方法としては、特に装置に制限はなく公知、慣用のもの
を用いることができるが、例えば、回転パン、回転ドラ
ム等が挙げられる。該転動装置に加温設備を付設された
ものは、被覆加工の高精度化や加工時間の調整に好適で
ある。Next, the present invention will be described in detail.
When adding a superabsorbent substance to the granular fertilizer in the present invention, it is desirable to add a superabsorbent resin to the granular fertilizer and to uniformly disperse the fertilizer on the surface of the fertilizer. A method in which the fertilizer is heated and a superabsorbent substance is added, and then uniformly dispersed in a rolling state, or the granular fertilizer in a rolling state while heating the granular fertilizer to a temperature suitable for each processing. There is a method in which a substance is added and uniformly dispersed. As a method of making each rolling state, there is no particular limitation on the device, and a known and commonly used method can be used, and examples thereof include a rotating pan and a rotating drum. The rolling device provided with a heating device is suitable for increasing the accuracy of the coating process and adjusting the processing time.
【０００７】本発明において使用され得る粒状肥料は、
肥料成分を含有する粒状物である。肥料成分は、水稲な
ど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、鉄等の種々の元素を含有する
成分であり、具体例としては、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（ＩＢ
ＤＵ）、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；鉄鋼スラグ等の含鉄肥料等の肥
料取締法に定められる普通肥料（複合肥料を含む）を挙
げることができる。中でも窒素（Ｎ）、リン（Ｐ）およ
びカリウム（Ｋ）より選ばれる肥料成分の一種以上、特
にこれら三種全ての肥料成分を含有するものが好まし
い。その具体例としては、ＮＰＫ成分型（Ｎ−Ｐ2Ｏ5−
Ｋ2Ｏ）肥料が挙げられ、かかる肥料としては、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型等を挙げること
ができる。本発明において使用される粒状肥料の粒径に
特に限定はないが、製造上は１〜５ｍｍが好ましい。[0007] The granular fertilizer that can be used in the present invention includes:
It is a granular material containing a fertilizer component. The fertilizer component is a component containing various elements such as nitrogen, phosphorus, potassium, silicon, magnesium, calcium, manganese, boron, and iron, which are applied to soil to provide nutrients in plant cultivation such as paddy rice. Examples include urea, ammonium nitrate, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, sodium nitrate, calcium nitrate, potassium nitrate, lime nitrogen, formaldehyde treated urea fertilizer (UF), acetaldehyde treated urea fertilizer (CDU), isobutyl Aldehyde processed urea fertilizer (IB
Nitrogenous fertilizers such as DU) and guanyl urea (GU); lime superphosphate, lime heavy superphosphate, fused phosphorus fertilizer, humic acid phosphorus fertilizer, calcined phosphorus fertilizer, heavy-burning phosphorus, magnesia superphosphate, polyphosphorus Phosphate fertilizers such as ammonium phosphate, potassium metaphosphate, calcium metaphosphate, magnesium phosphate, ammonium phosphate, potassium phosphate nitrate, phosphorous ammonium salt; potassium chloride, potassium sulfate,
Potassium fertilizers such as potassium sulfate, potassium sulfate, potassium bicarbonate and potassium phosphate; siliceous fertilizers such as calcium silicate; magnesium fertilizers such as magnesium sulfate and magnesium chloride; calcium lime, slaked lime and calcium carbonate Fertilizers: Manganese fertilizers such as manganese sulfate, manganese sulfate, and manganese sulphide; boronaceous fertilizers such as boric acid and borate; fertilizers such as iron and steel slag, etc. Including). Among them, those containing at least one fertilizer component selected from nitrogen (N), phosphorus (P) and potassium (K), particularly those containing all three fertilizer components, are preferred. As a specific example, the NPK component type (NP 2 O 5 −
K 2 O) include fertilizers, as such fertilizers such, 5-5-7 (N-P 2 O 5 -K 2 O refers to the weight ratio of. The same applies hereinafter.), 12-12-16 etc. 1 type flat type, 2 type horizontal type such as 5-5-5, 14-14-14, 6 type
3-6 flat type such as -6-5, 8-8-5, 4-7-
Type 4, up-type such as 9, 6-8-11, 4-7-7, 10-
5 type up flat type such as 20-20, 4-7-4, 6-9-6
6-type mountain type such as 6-4-5, 7-type valley type such as 14-10-13, 6-5-5, 8-type falling flat type such as 18-11-11, 7-6-5, 9 type down type such as 14-12-9, 3
10-type NP type such as -20-0, 18-35-0, 16-type
11-type NK type such as 0-12 and 18-0-16, 0-3-
14, 0-15-15, etc., and a 12-type PK type. Although the particle size of the granular fertilizer used in the present invention is not particularly limited, it is preferably 1 to 5 mm for production.
【０００８】本発明に使用される高吸水性物質は、水に
不溶で、通常は高吸水性物質の２〜２０００重量倍の水
を吸収・保持し得る物質である。高吸水性物質として
は、アクリル酸塩系重合体［例えば、住友化学工業
（株）製スミカゲルＮ−１００、Ｎ−１００Ｐ、Ｎ−１
００ＳＨ、ＮＰ−１０１０、住友精化（株）製のアクア
キープ１０ＳＨ−Ｐ、１０ＳＨ、１０ＳＨ−ＮＦ、ＳＡ
６０Ｓ、ＳＡ６０ＮＴＹＰＥII、（株）日本触媒製のア
クアリックＣＳ−６、ＣＳ−７］、アクリル酸−ビニル
アルコール共重合体［例えば、住友化学工業（株）製ス
ミカゲルＳ−５０、Ｓ−１１０、Ｓ−１２０、Ｓ−５１
０、Ｓ―５２０］、並びに、イソブチレン系重合体［例
えば（株）クラレ製のＫＩゲル−２１０Ｋ−Ｆ２］、エ
チレンオキサイド重合体、プロピレンオキサイド重合
体、エチレンオキサイド−プロピレンオキサイド共重合
体、ポリエチレンオキサイド変性樹脂、澱粉グラフト重
合体、澱粉、カルボキシメチルセルロース（ＣＭＣ）、
ＣＭＣ金属塩、ポリビニルアルコール、ベントナイトが
挙げられる。[0008] The superabsorbent substance used in the present invention is a substance which is insoluble in water and can absorb and retain water, usually 2 to 2000 times by weight of the superabsorbent substance. Examples of the superabsorbent material include acrylate polymers [for example, Sumikagel N-100, N-100P, N-1 manufactured by Sumitomo Chemical Co., Ltd.]
00SH, NP-1010, Aqua Keep 10SH-P, 10SH, 10SH-NF, SA manufactured by Sumitomo Seika Co., Ltd.
60S, SA60NTYPE II, Aqualic CS-6, CS-7 manufactured by Nippon Shokubai Co., Ltd.], acrylic acid-vinyl alcohol copolymer [for example, Sumikagel S-50, S-110, S manufactured by Sumitomo Chemical Co., Ltd.] -120, S-51
0, S-520], and an isobutylene-based polymer [for example, KI Gel-210K-F2 manufactured by Kuraray Co., Ltd.], an ethylene oxide polymer, a propylene oxide polymer, an ethylene oxide-propylene oxide copolymer, and a polyethylene oxide Modified resin, starch graft polymer, starch, carboxymethyl cellulose (CMC),
CMC metal salts, polyvinyl alcohol and bentonite are exemplified.
【０００９】本発明に使用されるウレタン樹脂は、必要
に応じて２種以上を混合して用いても良い。特にポリイ
ソシアネ−ト化合物とポリオ−ル化合物に硬化触媒を処
方したウレタン樹脂が好ましい。The urethane resin used in the present invention may be used as a mixture of two or more, if necessary. Particularly, a urethane resin in which a curing catalyst is formulated in a polyisocyanate compound and a polyol compound is preferable.
【００１０】本発明において用いるウレタン樹脂につい
てさらに説明する。ウレタン樹脂とは、ポリイソシアネ
−ト化合物とポリオ−ル化合物を反応させることにより
３次元架橋させた樹脂の総称であるが、本発明でいう未
硬化ウレタン樹脂とは、該ポリイソシアネ−ト化合物と
該ポリオ−ル化合物の混合物であり、全く反応させてな
いか、あるいは３次元化しない程度に予め一部を硬化反
応させたものをいう。硬化反応の促進のために触媒を添
加しておくことも有用な技術である。該未硬化樹脂の形
態としては無溶剤型、溶液型、水系エマルジョン型等何
れでも良いが、特に無溶剤型で、かつ加工温度において
液状であるものが好適である。The urethane resin used in the present invention will be further described. The urethane resin is a general term for resins which are three-dimensionally cross-linked by reacting a polyisocyanate compound and a polyol compound, and the uncured urethane resin in the present invention refers to the polyisocyanate compound and the polyol compound. -A mixture of compounds which have not been reacted at all or have been partially cured in advance to such an extent that they do not become three-dimensional. It is also a useful technique to add a catalyst to accelerate the curing reaction. The form of the uncured resin may be any of a solventless type, a solution type, an aqueous emulsion type and the like, but a non-solvent type and a liquid at a processing temperature are particularly preferable.
【００１１】ポリイソシアネ−ト化合物に特に限定はな
いが、具体的に例示するとトリレンジイソシアネ−ト
（ＴＤＩと言うことがある）、ジフェニルメタンジイソ
シアネ−ト（ＭＤＩと言うことがある）、ナフタレンジ
イソシアネ−ト、トリジンジイソシアネ−ト、ヘキサメ
チレンジイソシアネ−ト、イソホロンジイソシアネ−
ト、キシリレンジイソシアネ−ト、等を挙げることこと
ができ、必要に応じてこれらの混合物を用いることがで
きる。なかでも、ＭＤＩもしくはＴＤＩまたはこれらか
ら誘導されるオリゴマ−体（ポリメリックＭＤＩ、ポリ
メリックＴＤＩ等）が好適に用いられる。The polyisocyanate compound is not particularly limited, but specific examples include tolylene diisocyanate (sometimes referred to as TDI), diphenylmethane diisocyanate (sometimes referred to as MDI), and naphthalene. Diisocyanate, tolidine diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate
And xylylene diisocyanate, and a mixture thereof can be used if necessary. Among them, MDI or TDI or an oligomer derived therefrom (polymeric MDI, polymeric TDI, etc.) is preferably used.
【００１２】ポリオ−ル化合物については、特に限定は
ないが、例えばアミノアルコ−ル、アミン等を開始剤と
して用い、プロピレングリコール、トリメチロールプロ
パン等の脂肪族アルコールとエチレンオキサイドやプロ
ピレンオキサイドとを重付加して得られるポリエ−テル
ポリオ−ル、テトラヒドロフランを重合して得られるポ
リテトラメチレンエ−テルグルコ−ルなどのポリエ−テ
ル型ポリオ−ル、イサノ油やひまし油等の水酸基を保有
する天然油脂や多価アルコ−ルとポリエ−テルポリオ−
ルとカルボン酸化合物を反応させる等の方法で得られる
ポリエステル型ポリオ−ル、等が挙げられる。使用する
イソシアネートとポリオールのＮＣＯ／ＯＨ当量比は、
通常０．９〜１．２／１．０の間で調整される。The polyol compound is not particularly limited. For example, an amino alcohol, an amine or the like is used as an initiator, and an aliphatic alcohol such as propylene glycol or trimethylolpropane is mixed with ethylene oxide or propylene oxide. Polyether type polyols such as polyetherpolyol obtained by addition and polytetramethylene etherglucose obtained by polymerizing tetrahydrofuran; natural oils and fats having hydroxyl groups such as isano oil and castor oil; Alcohols and polyetherpoliols
And polyester-type polyols obtained by a method of reacting a carboxylic acid compound with a polyester. The NCO / OH equivalent ratio of the isocyanate and the polyol used is
It is usually adjusted between 0.9 and 1.2 / 1.0.
【００１３】未硬化ウレタン樹脂の硬化促進の目的で、
触媒を未硬化ウレタン樹脂に添加し、該触媒共存下に硬
化を行うことも有用な技術である。該触媒として具体的
には、トリエチレンジアミン、Ｎ−メチルモルフォリ
ン、Ｎ，Ｎ−ジメチルモルフォリン、ジアザビシクロウ
ンデセン、イミダゾール、エチルメチルイミダゾール、
ジアザビシクロオクタン、２，４，６，−トリス（ジメ
チルアミノメチル）フェノ−ル等のアミン系触媒；尿素
等のアンモニア誘導体；水酸化ナトリウム、水酸化カリ
ウム等のアルカリ性化合物；ジブチルスズラウレート、
ジブチルスズマレート等の有機スズ化合物が挙げられ
る。中でもアミン系触媒が好適に用いられる。該触媒は
そのまま、あるいは水溶液または水懸濁液として使用に
供される。固体触媒については粉砕微粉化したものを使
用するのが好ましい。触媒を使用する場合の触媒の量は
イソシアネートとポリオールの総重量に対し、通常０．
０５〜５重量％程度である。For the purpose of accelerating the curing of the uncured urethane resin,
It is also a useful technique to add a catalyst to an uncured urethane resin and perform curing in the presence of the catalyst. Specific examples of the catalyst include triethylenediamine, N-methylmorpholine, N, N-dimethylmorpholine, diazabicycloundecene, imidazole, ethylmethylimidazole,
Amine-based catalysts such as diazabicyclooctane and 2,4,6-tris (dimethylaminomethyl) phenol; ammonia derivatives such as urea; alkaline compounds such as sodium hydroxide and potassium hydroxide; dibutyltin laurate;
Organotin compounds such as dibutyltin malate are exemplified. Among them, amine catalysts are preferably used. The catalyst is used as it is or as an aqueous solution or suspension. As for the solid catalyst, it is preferable to use a pulverized powder. When a catalyst is used, the amount of the catalyst is usually 0.1 to the total weight of the isocyanate and the polyol.
It is about 0.5 to 5% by weight.
【００１４】さらに、必要に応じて、着色のために酸化
チタン、ベンガラ等の顔料や染料、あるいは充填剤とし
てタルク、マイカ、シリカ、カ−ボンブラック、樹脂粉
末、クレー等の無機／有機粉粒体、界面活性剤等を、本
混合物の硬化において許容される範囲で、未硬化ウレタ
ン樹脂中に含有させたり、タルク、カオリン、クレー、
界面活性剤等については本被覆肥料の被覆層表面に付着
させたり、塗布することも可能である。Further, if necessary, pigments or dyes such as titanium oxide and red iron oxide for coloring, or inorganic / organic powders such as talc, mica, silica, carbon black, resin powder and clay as fillers. Bodies, surfactants, etc., within the range allowed for curing of this mixture, contained in uncured urethane resin, talc, kaolin, clay,
Surfactants and the like can be attached to or coated on the surface of the coating layer of the present coated fertilizer.
【００１５】本発明における高吸水性物質の使用量は、
その粒径により異なるが、熱硬化性樹脂１００重量部に
対して肥料の溶出速度制御の点から通常は０．０１〜５
０重量部である。好ましくは０．１〜３０重量部、さら
に好ましくは１〜２０重量部である。The amount of the superabsorbent used in the present invention is:
Although it varies depending on the particle size, it is usually 0.01 to 5 from the viewpoint of controlling the dissolution rate of fertilizer per 100 parts by weight of the thermosetting resin.
0 parts by weight. Preferably it is 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight.
【００１６】外界が低温時には、高吸水性物質のみを除
いた同様の粒状被覆肥料を用いた場合に比べて、本発明
により得られる粒状被覆肥料を用いた場合に、肥料の外
部への溶出速度が加速されている。具体的には、被検体
試料を一定量計り取り水を加えた後、水中で一定温度で
保存して、水中の肥料濃度を分析機器にて追跡して被覆
肥料外部への肥料の溶出量を測定して加速状況を確認す
る。When the external environment is at a low temperature, the rate of elution of the fertilizer to the outside is higher when the granular coated fertilizer obtained according to the present invention is used than when the same granular coated fertilizer except for the superabsorbent material alone is used. Is accelerating. Specifically, after measuring a certain amount of the test sample, adding water, storing it in water at a constant temperature, tracking the fertilizer concentration in the water with an analytical instrument, and measuring the amount of fertilizer eluted outside the coated fertilizer. Measure and check the acceleration status.
【００１７】本発明の粒状被覆肥料の製造方法は、粒状
肥料に高吸水性物質を添加後、ウレタン樹脂からなる少
なくとも１層の被膜で被覆させることを特徴とする方法
であり、通常は下記（１）〜（５）の工程を備える方法
である。 （１）粒状肥料に高吸水性樹脂を添加、均一分散させる
工程 （２）粒状肥料を転動状態にする工程 （３）該転動状態にある粒状肥料に層厚が１〜１０μｍ
になる量の液状の未硬化熱硬化性樹脂を添加する工程 （４）該粒状肥料の転動状態を維持し、各肥料粒子表面
を該未硬化熱硬化性樹脂で被覆する工程 （５）該粒状肥料の転動状態を維持し、該未硬化熱硬化
性樹脂を熱硬化させる工程 そして一般的には、上記（１）の工程の後、（２）〜
（５）の工程をこの順に２回またはそれ以上繰り返すこ
とにより所定の被覆厚さの粒状被覆肥料が得られる。The method for producing a granular coated fertilizer of the present invention is characterized by adding a superabsorbent substance to a granular fertilizer and coating the fertilizer with at least one urethane resin film. This is a method including the steps 1) to (5). (1) Step of adding a superabsorbent resin to the granular fertilizer and uniformly dispersing it (2) Step of bringing the granular fertilizer into a rolling state (3) Layer thickness of the granular fertilizer in the rolling state is 1 to 10 μm
(4) maintaining the rolling state of the granular fertilizer and coating the surface of each fertilizer particle with the uncured thermosetting resin; A step of maintaining the rolling state of the granular fertilizer and thermally curing the uncured thermosetting resin. Generally, after the step (1), (2) to
By repeating the step (5) twice or more in this order, a granular coated fertilizer having a predetermined coating thickness can be obtained.
【００１８】転動状態にある粒状肥料子に未硬化ウレタ
ン樹脂を添加する(３)の工程においては、予め硬化剤や
触媒が配合、混合された未硬化ウレタン樹脂を含む組成
物として、添加することができる。或いは未硬化ウレタ
ン樹脂、硬化剤、触媒等を別々に添加し、装置内で各成
分が混合される方法であってもよい。添加の方法として
は、例えば滴下、噴霧等を挙げることができる。上記
（５）の工程では、（４）の工程において未硬化ウレタ
ン樹脂で被覆された粒状肥料の転動状態を、通常、所定
の加工温度で維持し、該未硬化ウレタン樹脂を硬化させ
る。加工温度としては、上記未硬化ウレタン樹脂のゲル
タイム（ＪＩＳ Ｋ ５９０９に準じて測定）が５分以
内、さらに好ましくは３分以内となる温度を適宜選択す
ることができるが、通常は５０〜１００℃であり、好ま
しくは６５〜８５℃である。In the step (3) of adding the uncured urethane resin to the granular fertilizer in the rolling state, the composition is added as a composition containing the uncured urethane resin in which a curing agent and a catalyst have been previously blended and mixed. be able to. Alternatively, a method may be used in which an uncured urethane resin, a curing agent, a catalyst, and the like are separately added, and the respective components are mixed in the apparatus. Examples of the method of addition include dropping and spraying. In the step (5), the rolling state of the granular fertilizer coated with the uncured urethane resin in the step (4) is usually maintained at a predetermined processing temperature to cure the uncured urethane resin. As the processing temperature, a temperature at which the gel time (measured according to JIS K 5909) of the uncured urethane resin is within 5 minutes, more preferably within 3 minutes can be appropriately selected, but usually 50 to 100 ° C. And preferably at 65 to 85 ° C.
【００１９】１回の（３）の工程において添加される未
硬化ウレタン樹脂の量は、各粒状肥料における被覆の均
一性の点からコ−ティングされる膜厚に換算して、通常
１０μｍ以下、好ましくは６μｍ以下となるように調整
され、また、被覆回数が過多となり、工業的に不利とな
ることを避ける点から、通常１μｍ以上、好ましくは２
μｍ以上となるように調整される。The amount of the uncured urethane resin added in one step (3) is usually 10 μm or less in terms of the film thickness to be coated in view of the uniformity of coating on each granular fertilizer. It is preferably adjusted to 6 μm or less, and is usually 1 μm or more, and preferably 2 μm or less, from the viewpoint of avoiding an excessive number of coatings and industrial disadvantage.
It is adjusted to be at least μm.
【００２０】（５）の工程においては、通常、（４）の
工程で未硬化ウレタン樹脂が被覆された粒状肥料をその
まま転動状態で維持し、未硬化ウレタン樹脂を硬化させ
る。ここで言う硬化とは、一般にいう完全硬化である必
要はなく、未硬化ウレタン樹脂がゲル化点を過ぎ、曳糸
性がなくなった状態をいう。そのような状態になれば、
その後はウレタン樹脂の粘着性に伴って粒子同士が凝集
し、解砕不能となることはないので、これに次の未硬化
ウレタン樹脂を添加し、（２）〜（５）の工程を繰り返
すことが可能である。この目的を達成できる範囲であれ
ば、ウレタン樹脂成分を肥料に間欠的に添加しても連続
的に添加しても良い。In the step (5), the granular fertilizer coated with the uncured urethane resin in the step (4) is usually kept in a rolling state, and the uncured urethane resin is cured. The term “curing” as used herein generally does not require complete curing, but refers to a state in which the uncured urethane resin has passed the gel point and has lost spinnability. If that happens,
Thereafter, the particles do not agglomerate due to the adhesiveness of the urethane resin and cannot be disintegrated. Therefore, the next uncured urethane resin is added thereto, and the steps (2) to (5) are repeated. Is possible. As long as this object can be achieved, the urethane resin component may be added intermittently or continuously to the fertilizer.
【００２１】本発明の粒状被覆肥料の製造方法は、上記
工程を複数回（例えば１０〜１２回程度）繰り返すこと
で高吸水性樹脂を全量、被膜内に取り込み、被覆欠陥の
ない粒状肥料を得ることができる。最終層までコ−トさ
れた被覆肥料は、必要に応じて樹脂の完全硬化のため、
所定の硬化温度で十分維持される工程を含んでいても良
い。また、肥料の固結防止や施肥した際の浮上防止のた
めに、該被覆肥料表面にクレイ等の無機微粉を添加する
ことにより付着させることも有用な技術である。According to the method for producing a granular coated fertilizer of the present invention, the above process is repeated a plurality of times (for example, about 10 to 12 times) to incorporate the entire superabsorbent resin into the coating to obtain a granular fertilizer without coating defects. be able to. Coated fertilizer coated to the final layer, if necessary, for complete curing of the resin,
The method may include a step of sufficiently maintaining the temperature at a predetermined curing temperature. It is also a useful technique to add an inorganic fine powder such as clay to the surface of the coated fertilizer in order to prevent solidification of the fertilizer and to prevent floating when fertilizer is applied.
【００２２】本発明の粒状被覆肥料は、常温で用いるこ
とができることは勿論のこと、比較的低温な地域や秋か
ら春にかけての比較的低温な季節に使用することができ
る。特に低温でコンスタントに短期間に肥料成分を溶出
させることができる。また、海水中の海苔養殖用の肥料
としても使用できる。The granular coated fertilizer of the present invention can be used not only at room temperature but also in a relatively low temperature region or a relatively low temperature season from autumn to spring. In particular, the fertilizer component can be eluted at a low temperature constantly and in a short period of time. It can also be used as a fertilizer for seaweed cultivation in seawater.
【００２３】[0023]
【実施例】以下実施例により本発明をさらに具体的に説
明するが、本発明はこれらによって何ら限定されるもの
ではない。粒状被覆肥料の評価方法を以下に示す。 １．ゲルタイム（熱硬化温度）はＪＩＳのＫ ５９０９
に準じて測定。 ２．高吸水性物質のみ被覆された微粒物の有無の確認 コート装置から被覆肥料を取り出した後の残留物の重量
確認取り出した被覆肥料７．５ｇを水１００ｇに入れ１
週間放置、吸水した浮遊物を確認。 ３．溶出測定 肥料溶出の評価は農林水産省環境技術研究所提案の方法
（例えば「詳解肥料分析法」越野正義 編著、１９８８
年）に則り実施した。具体的には、被検体試料をサンプ
ル瓶に７．５０ｇ計り取り水１００ｍｌを加えた後、２
５℃、１５℃で保存して、所定時間経過後、０．５ｍｌ
分取し、発色用試薬で発色させ、分光光度計にて水中の
尿素肥料濃度を追跡して被覆肥料外部への肥料の溶出量
を測定して溶出状況を確認する。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. The evaluation method of the granular coated fertilizer is shown below. 1. Gel time (thermosetting temperature) is JIS K 5909
Measured according to. 2. Confirmation of the presence or absence of fine particles coated only with the superabsorbent substance Check the weight of the residue after removing the coated fertilizer from the coater 7.5 g of the removed coated fertilizer is put in 100 g of water and put into 1 g of water.
Leaving for a week and confirming the suspended matter absorbed. 3. Dissolution measurement Evaluation of fertilizer dissolution is performed by a method proposed by the Ministry of Agriculture, Forestry and Fisheries Environmental Technology Research Institute (for example, “Detailed Analysis of Fertilizer” edited by Masayoshi Koshino, 1988).
Year). Specifically, after measuring 7.50 g of a test sample into a sample bottle and adding 100 ml of water,
Store at 5 ° C and 15 ° C, and after a predetermined time, 0.5 ml
The fertilizer is collected, colored with a coloring reagent, the concentration of urea fertilizer in water is tracked with a spectrophotometer, and the amount of fertilizer eluted outside the coated fertilizer is measured to confirm the elution status.
【００２４】実施例１ 粒状尿素（平均粒径３．１ｍｍ）５ｋｇを、熱風発生機
を付設した温度制御可能な転動式コート装置に仕込み、
２０〜３０ＲＰＭで回転させ粒状肥料を転動状態にし
た。該装置を加熱して仕込んだ粒状尿素の温度を７０〜
７５℃に維持し、転動状態を維持させた。送風を停止
し、高吸水性物質［住友精化（株）製、商品名アクアキ
ープ１０ＳＨ−Ｐ（平均粒度；２００〜３００μｍ）］
１５ｇを肥料に速やかに添加し、５分間転動状態を維持
し、分散させた。次いで被覆樹脂として、ポリメリック
ＭＤＩ［住友バイエルウレタン（株）製、商品名：スミ
ジュ−ル４４Ｖ１０］を１１.８ｇ、分岐ポリエ−テル
型ポリオ−ル［住友バイエルウレタン（株）製、商品
名：スミフェンＴＭ］を１３.１ｇ、及びアミン触媒と
して２，４，６−トリス（ジメチルアミノメチル）フェ
ノ−ルを０．３ｇを攪拌混合して得た未硬化ウレタン樹
脂組成物を、速やかに転動状態にある該粒状尿素に添加
した。該未硬化ウレタン樹脂組成物は室温において液状
であった。Example 1 5 kg of granular urea (average particle size: 3.1 mm) was charged into a temperature-controllable rolling coater equipped with a hot air generator.
The granular fertilizer was rolled by spinning at 20-30 RPM. The temperature of the granular urea charged by heating the apparatus is 70 to
The temperature was maintained at 75 ° C., and the rolling state was maintained. Stop the air blowing, and make the superabsorbent substance [Aqua Keep 10SH-P (average particle size: 200 to 300 µm) manufactured by Sumitomo Seika Co., Ltd.]
15 g was quickly added to the fertilizer, and kept in a rolling state for 5 minutes to be dispersed. Next, as a coating resin, 11.8 g of Polymeric MDI [manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name: Sumidur 44V10], branched polyether type polyol [Sumitomo Bayer Urethane Co., Ltd., trade name: Sumiphen] TM] and 0.3 g of 2,4,6-tris (dimethylaminomethyl) phenol as an amine catalyst were stirred and mixed, and the uncured urethane resin composition was immediately rolled. Was added to the granular urea. The uncured urethane resin composition was liquid at room temperature.
【００２５】なお、本実施例で用いた未硬化ウレタン樹
脂のゲルタイムは６５℃において２分３０秒であった。
また、投入した樹脂量は、仕込み肥料に対して０．５重
量％であり、該粒径の肥料を被覆した場合、コ−ト樹脂
の膜厚は約３．１μｍとなる。目視観察では、投入した
樹脂は約３０秒でほぼ均一に粒状肥料表面をコ−トする
ことが確認された。樹脂投入後３分後に試料の一部を取
り出したところ、樹脂は殆ど粘着性を失った状態であっ
た。３分毎に上記工程を３回繰り返した後、送風を再開
し、その後、上記工程を１７回繰り返し、肥料に対して
１０重量％被覆を行った。最終的に該樹脂被覆した粒状
肥料を７０℃〜７５℃で３分維持し、樹脂を完全硬化す
ることでウレタン樹脂被覆した粒状肥料を作成した。被
覆粒状肥料を取り出したコート装置内からは、アクアキ
ープを被覆した微粒物は得られず、また、水中での浮遊
物の確認試験でも、浮遊物はほとんど無かった。The gel time of the uncured urethane resin used in this example was 2 minutes and 30 seconds at 65 ° C.
The amount of the injected resin is 0.5% by weight based on the charged fertilizer, and when the fertilizer having the particle diameter is coated, the thickness of the coat resin is about 3.1 μm. Visual observation confirmed that the injected resin coated the surface of the granular fertilizer almost uniformly in about 30 seconds. When a part of the sample was taken out three minutes after the resin was charged, the resin was almost in a state of having lost its tackiness. After repeating the above process three times every 3 minutes, the air supply was restarted. Thereafter, the above process was repeated 17 times, and the fertilizer was coated with 10% by weight. Finally, the resin-coated granular fertilizer was maintained at 70 ° C. to 75 ° C. for 3 minutes, and the resin was completely cured to produce a urethane resin-coated granular fertilizer. From the inside of the coater from which the coated granular fertilizer was removed, no fine particles coated with aquakeep were obtained, and there was almost no suspended matter in the test for confirming suspended matter in water.
【００２６】実施例２〜１３ 使用するウレタン樹脂量、使用する吸水性物質の種類を
表１、２、３に記載のものとした以外は、実施例１と同
様の操作でサンプルを作製した。実施例４、７、１０、
１３につきコート装置内に高吸水性物質を被覆した微粒
物の存在を確認したが無かった。また、実施例２〜１３
の被覆粒状肥料の水中での浮遊物の確認試験の結果、浮
遊物はほとんど無かった。これらの２５℃と１５℃の水
中での、尿素肥料の溶出割合の経時変化を追跡した。肥
料溶出挙動を表１、２、３に示す。なお、表１、２、３
中、使用樹脂量（肥料に対する重量％）とは、尿素肥料
重量に対するウレタン樹脂重量％を、使用高吸水性樹脂
量（肥料に対する重量％）とは、尿素肥料重量に対する
高吸水性樹脂重量％示す。使用した高吸水性物質はアク
リル酸塩系重合体［住友精化（株）製、商品名アクアキ
ープ１０ＳＨ−Ｐ（平均粒度；前記と同じ）、商品名ア
クアキープ１０ＳＨ（平均粒度；２００〜３００μ
ｍ）、アクアキープ１０ＳＨ−ＮＦ（平均粒度；２０〜
３０μｍ）］、アクリル酸−ビニルアルコール共重合体
［住友化学工業（株）製、商品名スミカゲルＳＰ−５１
０（平均粒度１０μｍ）］である。Examples 2 to 13 Samples were prepared in the same manner as in Example 1, except that the amount of the urethane resin used and the type of the water-absorbing substance used were those shown in Tables 1, 2 and 3. Examples 4, 7, 10,
The presence of fine particles coated with a superabsorbent substance was confirmed in the coating apparatus for No. 13 but was not found. Examples 2 to 13
As a result of the confirmation test of suspended matter in water of the coated granular fertilizer, there was almost no suspended matter. The time-dependent changes in the dissolution rate of the urea fertilizer in the water at 25 ° C. and 15 ° C. were tracked. The fertilizer elution behavior is shown in Tables 1, 2, and 3. Tables 1, 2, and 3
Medium, the amount of resin used (% by weight based on fertilizer) indicates the urethane resin weight% based on the weight of urea fertilizer, and the amount of superabsorbent resin used (% by weight based on fertilizer) indicates the% by weight of superabsorbent resin based on the weight of urea fertilizer. . The high water-absorbing substance used was an acrylate polymer [Sumitomo Seika Co., Ltd., trade name AquaKeep 10SH-P (average particle size; same as described above), trade name AquaKeep 10SH (average particle size; 200 to 300 µm).
m), Aqua Keep 10SH-NF (average particle size;
30 μm)], acrylic acid-vinyl alcohol copolymer [Sumikagel SP-51, trade name, manufactured by Sumitomo Chemical Co., Ltd.]
0 (average particle size 10 μm)].
【００２７】ここで、アクアキープ１０ＳＨ及びアクア
キープ１０ＳＨ−Ｐの平均粒度は、篩別により、８５０
μｍ〜５００μｍ、５００μｍ〜２５０μｍ、２５０μ
ｍ〜１８０μｍ、１８０μｍ〜１５０μｍ、１５０μｍ
〜１０６μｍ、１０６μｍ〜７５μｍ及び７５μｍ〜０
μｍに分取し、加重平均を測定したものである。Here, the average particle size of Aquakeep 10SH and Aquakeep 10SH-P was 850 by screening.
μm to 500 μm, 500 μm to 250 μm, 250 μ
m-180 μm, 180 μm-150 μm, 150 μm
~ 106 μm, 106 μm to 75 μm and 75 μm to 0
The weighted average was measured after fractionating into μm.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【表２】 [Table 2]
【００３０】[0030]
【表３】 [Table 3]
【００３１】比較例１ 粒状尿素（平均粒径３．１ｍｍ）５ｋｇを、熱風発生機
を付設した温度制御可能な転動式コート装置に仕込み、
２０〜３０ＲＰＭで回転させ粒状肥料を転動状態にし
た。該装置を加熱して仕込んだ粒状尿素の温度を７０〜
７５℃に維持し、転動状態を維持させた。次いで被覆樹
脂として、ポリメリックＭＤＩ［住友バイエルウレタン
（株）製、商品名：スミジュ−ル４４Ｖ１０］を１１．
８ｇ、分岐ポリエ−テル型ポリオ−ル（住友バイエルウ
レタン製、商品名：スミフェンＴＭ）を１３.１ｇ、高
吸水性物質［住友精化（株）製、商品名アクアキープ１
０ＳＨ（平均粒度；前記と同じ）］を１．２５ｇ、及び
アミン触媒として２，４，６−トリス（ジメチルアミノ
メチル）フェノ−ルを０.３ｇと攪拌混合して得た未硬
化ウレタン樹脂組成物を、速やかに転動状態にある該粒
状尿素に添加した。３分毎に上記工程を合計２０回繰り
返し、肥料に対してウレタン樹脂１０重量％被覆を行っ
た。また、高吸水性物質の使用総量は、肥料成分１００
部に対して０．５部２５ｇである。最終的に該樹脂被覆
した粒状肥料を７０℃〜７５℃で３分維持し、樹脂を完
全硬化することでウレタン樹脂被覆した粒状肥料を作成
した。被覆粒状肥料の取り出し後、コート装置内のアク
アキープのウレタン被覆微粒物を確認したところ、４．
０ｇあり、ロスが非常に多かった。また、水中での浮遊
物の確認試験を行なった結果、膨潤した浮遊物が多量に
確認された。Comparative Example 1 5 kg of granular urea (average particle size: 3.1 mm) was charged into a temperature-controllable rolling coater equipped with a hot air generator.
The granular fertilizer was rolled by spinning at 20-30 RPM. The temperature of the granular urea charged by heating the apparatus is 70 to
The temperature was maintained at 75 ° C., and the rolling state was maintained. Then, as a coating resin, polymeric MDI [Sumitomo Bayer Urethane Co., Ltd., trade name: Sumidur 44V10] 11.
8 g, 13.1 g of a branched polyether type polyol (manufactured by Sumitomo Bayer Urethane, trade name: Sumifene TM), a superabsorbent substance [manufactured by Sumitomo Seika Co., Ltd., trade name AquaKeep 1]
Uncured urethane resin composition obtained by stirring and mixing 1.25 g of OSH (average particle size; same as described above) with 0.3 g of 2,4,6-tris (dimethylaminomethyl) phenol as an amine catalyst. The material was quickly added to the rolling urea granular urea. Every three minutes, the above process was repeated 20 times in total, and the fertilizer was coated with 10% by weight of urethane resin. In addition, the total amount of the superabsorbent used is 100% of the fertilizer component.
The amount is 0.5 parts and 25 g per part. Finally, the resin-coated granular fertilizer was maintained at 70 ° C. to 75 ° C. for 3 minutes, and the resin was completely cured to produce a urethane resin-coated granular fertilizer. After taking out the coated granular fertilizer, it was confirmed that the urethane-coated fine particles of aquakeep in the coating apparatus were confirmed.
There was 0 g, and the loss was very large. In addition, as a result of a test for confirming suspended matter in water, a large amount of swollen suspended matter was confirmed.
【００３２】[0032]
【発明の効果】本発明の粒状被覆肥料は、高吸水性樹脂
をロスなく使用して高吸水性樹脂由来の微粒物の生成を
抑え、かつ、水中に入れた時に浮遊物が少なく、常温か
ら低温でコンスタントに短期間に溶出し、溶出時期を精
密に制御させることができる。EFFECT OF THE INVENTION The granular coated fertilizer of the present invention uses a superabsorbent resin without loss, suppresses the production of fine particles derived from the superabsorbent resin, and has a small amount of suspended matter when put in water. It elutes constantly at a low temperature in a short time, and the elution time can be precisely controlled.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 遠藤 和久 茨城県つくば市北原６ 住友化学工業株式 会社内 Ｆターム(参考） 4G004 BA00 4H061 AA02 DD01 DD04 DD20 EE35 EE37 EE45 EE62 EE63 FF08 GG70 HH03 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhisa Endo 6 Kitahara, Tsukuba, Ibaraki Pref.
Claims (5)
ン樹脂からなる少なくとも１層の被膜で被覆させること
を特徴とする粒状被覆肥料の製造方法。1. A method for producing a granular coated fertilizer, comprising adding a superabsorbent substance to a granular fertilizer and coating the fertilizer with at least one layer of urethane resin.
１に記載の方法。 （１）粒状肥料に高級水性物質を添加する工程 （２）高吸水性物質を添加した粒状肥料を転動状態にす
る工程 （３）該転動状態にある粒状肥料に層厚が１〜１０μｍ
になる量の液状の未硬化ウレタン樹脂を添加する工程 （４）該粒状肥料の転動状態を維持し、各肥料粒子表面
を該未硬化ウレタン樹脂で被覆する工程 （５）該粒状肥料の転動状態を維持し、該ウレタン樹脂
を熱硬化させる工程2. The method according to claim 1, comprising the following steps (1) to (5). (1) Step of adding a high-grade aqueous substance to the granular fertilizer (2) Step of turning the granular fertilizer to which the superabsorbent substance has been added (3) Layer thickness of the granular fertilizer in the rolling state is 1 to 10 μm
(4) maintaining the rolling state of the granular fertilizer and coating the surface of each fertilizer particle with the uncured urethane resin; and (5) rolling the granular fertilizer. Maintaining the moving state and thermally curing the urethane resin
はそれ以上繰り返す請求項２に記載の方法。3. The method according to claim 2, wherein the steps (2) to (5) are repeated twice or more in this order.
アクリル酸−ビニルアルコール共重合体、イソブチレン
系重合体、エチレンオキサイド重合体、プロピレンオキ
サイド重合体、エチレンオキサイド−プロピレンオキサ
イド共重合体、ポリエチレンオキサイド変性樹脂、澱粉
グラフト重合体、澱粉、カルボキシメチルセルロース、
カルボキシメチルセルロース金属塩、ポリビニルアルコ
ールまたはベントナイトである請求項１〜３のいずれか
に記載の製造方法。4. The superabsorbent material is an acrylate polymer,
Acrylic acid-vinyl alcohol copolymer, isobutylene-based polymer, ethylene oxide polymer, propylene oxide polymer, ethylene oxide-propylene oxide copolymer, polyethylene oxide-modified resin, starch graft polymer, starch, carboxymethyl cellulose,
The method according to any one of claims 1 to 3, which is a metal salt of carboxymethyl cellulose, polyvinyl alcohol or bentonite.
造される粒状被覆肥料。5. A granular coated fertilizer produced by the method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001066313A JP2001328891A (en) | 2000-03-15 | 2001-03-09 | Method for producing granular, coated fertilizer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000-72015 | 2000-03-15 | ||
| JP2000072015 | 2000-03-15 | ||
| JP2001066313A JP2001328891A (en) | 2000-03-15 | 2001-03-09 | Method for producing granular, coated fertilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001328891A true JP2001328891A (en) | 2001-11-27 |
Family
ID=26587555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001066313A Pending JP2001328891A (en) | 2000-03-15 | 2001-03-09 | Method for producing granular, coated fertilizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001328891A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004162018A (en) * | 2002-09-25 | 2004-06-10 | Koyo Seiko Co Ltd | Lubricant composition, decelerator by using the same and electric power steering device by using the same |
| JP2011225424A (en) * | 2010-03-31 | 2011-11-10 | Central Glass Co Ltd | Coated granular body, and method for producing the same |
-
2001
- 2001-03-09 JP JP2001066313A patent/JP2001328891A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004162018A (en) * | 2002-09-25 | 2004-06-10 | Koyo Seiko Co Ltd | Lubricant composition, decelerator by using the same and electric power steering device by using the same |
| JP4591743B2 (en) * | 2002-09-25 | 2010-12-01 | 株式会社ジェイテクト | Grease composition, speed reducer using the same, and electric power steering device using the same |
| JP2011225424A (en) * | 2010-03-31 | 2011-11-10 | Central Glass Co Ltd | Coated granular body, and method for producing the same |
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