JP2000044378A - Fertilizer composition and fertilizer molded product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fertilizer composition having a high fertilizer-retaining ability and a high water-retaining ability and effective also for preventing the outflow of the fertilizer by adding an N-vinylamide-based cross-linked resin as a water-absorbing resin and an organic fertilizer or an inorganic fertilizer as a fertilizer component. SOLUTION: This fertilizer composition comprises l-50 pts.wt. of an N-vinylamide- based cross-linked resin as a water-absorbing resin and 50-99 pts.wt. of an inorganic fertilizer or an organic fertilizer as a fertilizer component, wherein the total amount of the components is 100 pts.wt. The N-vinylamide-based cross-linked resin is obtained by (co)polymerizing a monomer of the formula (R1 and R2 are each H or methyl group, or R1 and R2 are bonded to each other to form a 3 or 4C alkylene group) or the monomer of the formula and a copolymerizable monomer with a cross-linking agent. The fertilizer composition is molded into fertilizer molded products such as bar-like products, pellet-like products or granular products so that the fertilizer composition can easily be treated and applied. The fertilizer molded products are used for flowering plants, ornamental foliage plants, garden trees, lawns, fruit trees, vegetables, etc., without inhibiting the germination and rooting of the plants.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fertilizer composition having a water retaining property and a large fertilizing ability, and a fertilizer molded article using such a composition.

[0002]

2. Description of the Related Art Conventionally, in order to enhance the fertilizing effect of a fertilizer in soil, a granulated fertilizer obtained by granulating a powdery fertilizer component or a thermosetting resin such as an isobutyl urea resin or a phenol resin is coated. Slow-release fertilizers such as coated fertilizers have been developed. However, granulated fertilizers merely increase the particle diameter of the fertilizer powder and reduce the dissolution rate and the outflow rate, and are not satisfactory in terms of fertilizing power.
In addition, since the coated fertilizer uses a water-insoluble polymer as its coating agent, it has a problem that the resin fragments and particles remain without being disintegrated in the soil.

JP-A-5-339567 proposes a pellet or granular soil water retention agent containing an inorganic substance such as zeolite, an organic fertilizer or an anionic water-absorbing agent. In the official gazette,
A water retention effect and a fertilization retention effect by impregnating a fertilizer component into an inorganic continuous porous material obtained by calcining a raw material powder of silica stone, clay, etc., and granulating with a water-soluble polymer have been proposed. . JP-A-60-51684 discloses a soil fertilizer obtained by adding a polyacrylate-based water-absorbing agent to a dried product obtained after culturing from calcium phosphate, ammonium molybdate, a nitrogen-fixing organism, and urea. It has been proposed for use in dry soils where water deficit is significant.

[0004]

However, none of the above methods has a sufficient water absorbing effect in the soil. For example, the absorbent is chemically unstable, so that it does not react with soil-containing substances or heat and light. However, it has not been satisfactory yet, for example, it may be easily decomposed, thereby reducing the water absorption (water retention) ability or affecting plant growth.
The present invention has been made in view of such circumstances, and provides a fertilizer composition that can mix inorganic and organic fertilizers, has high fertilizing ability and water retaining ability, and is also effective in preventing runoff. The purpose is to: Another object of the present invention is to provide a fertilizer molded product obtained by molding the composition into a shape which is easy to handle and easy to apply.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by using a fertilizer composition containing a specific water-absorbing resin and a fertilizer component, and a molded article thereof, Have found that the above objectives can be achieved,
The present invention has been completed. That is, the present invention relates to the following matters. (1) The following general formula (I) is used as the water-absorbing resin.

Embedded image [Wherein R ₁ and R ₂ independently represent hydrogen or a methyl group, or R ₁ and R ₂ are bonded to each other to represent an alkylene group having 3 to 4 carbon atoms. Using a cross-linking agent, or a monomer represented by the formula
A fertilizer composition comprising an N-vinylamide-based crosslinked resin obtained by polymerization and an inorganic or organic fertilizer as a fertilizer component. (2) The fertilizer composition according to the above (1), comprising 1 to 50 parts by weight of an N-vinylamide-based crosslinked resin, 50 to 99 parts by weight of a fertilizer component, and 100 parts by weight in total. (3) The fertilizer composition according to the above (1) or (2), wherein the N-vinylamide-based crosslinked resin is an N-vinylacetamide-based crosslinked resin. (4) A fertilizer molded article obtained by molding the fertilizer composition according to any of (1) to (3). (5) The fertilizer molded article according to the above (4), which is in the form of a rod, pellet, or granule.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The water-absorbing resin used in the present invention is a nonionic resin which is hardly affected by an ionic component contained in a fertilizer component, specifically, a water-absorbing N-vinylamide-based crosslinked resin. The N-vinylamide-based cross-linked resin is obtained by mixing an N-vinylamide represented by the general formula (I) and another monomer copolymerizable with N-vinylamide as needed with two polymerizable double bonds. It is a water-absorbing resin produced by radical polymerization in the presence of at least one crosslinkable monomer (crosslinking agent). The crosslinked resin is capable of absorbing a wide range of aqueous solutions such as high-concentration salt solutions such as fertilizers, acidic water and alkaline water, and is also excellent in heat resistance and light resistance. It has the characteristic of not inhibiting rooting.

Specific examples of the N-vinylamide represented by the general formula (I) include N-vinylacetamide, N-methyl-N
-Vinylacetamide, N-vinylformamide, N-
Methyl-N-vinylformamide, N-vinyl-α-pyrrolidone and the like can be mentioned. Among these, N-vinylacetamide is particularly preferred from the viewpoint of water absorption and stability. Also, a crosslinked resin obtained by copolymerizing a monomer copolymerizable with N-vinylamide can be used as long as the above object is not impaired. Specific examples include hydroxyethyl (meth) methacrylate, hydroxypropyl (meth) acrylate, methyl (meth) acrylate, acrylonitrile, vinyl acetate, (meth) acrylamide, (meth) acrylic acid and salts thereof. 30% by weight of all monomers (excluding cross-linking agent) to the extent that the intended performance of the invention is not impaired
Those copolymerized in the following proportions are preferred. If the copolymerization ratio is high, the liquid absorbing ability of an aqueous solution having a high salt concentration is reduced, and heat resistance, light stability and the like are reduced, and furthermore, germination and rooting inhibition may be unfavorably caused.

[0008] The N-vinylamide-based crosslinked resin used in the present invention must be crosslinked and insolubilized by some method. As the crosslinking method, a compound having two or more polymerizable unsaturated groups in one molecule and / or a functional group in another monomer copolymerizable with N-vinylamide may be used in the monomer or a mixture thereof. A method is used in which a compound capable of forming a chemical bond by reacting with a compound is added as a cross-linking agent, and the compound is cross-linked with the polymerization of the monomer.

Examples of the crosslinking agent having two or more polymerizable unsaturated groups in one molecule include tetraallyloxyethane, pentaerythritol tetraallyl ether, pentaerythritol triallyl ether, trimethylolpropane triallyl ether, and ethylene glycol diallyl ether. , Diethylene glycol diallyl ether, triethylene glycol diallyl ether, diallyl ether,
Hydroxyl groups such as monosaccharides, disaccharides, polysaccharides and cellulose
Polyarylether derived from a compound having two or more in the molecule, triallyl trimellitate, triallyl citrate, diallyl oxalate, diallyl succinate, diallyl adipate, diallyl maleate, etc. Compounds having two or more allyl groups in one molecule such as polyallyl ester, diallylamine, triallyl isocyanurate, etc., divinyl oxalate, divinyl malonate, divinyl succinate, divinyl glutarate, adipine Acid divinyl,
Compounds having two or more vinyl ester structures in one molecule, such as divinyl maleate, divinyl fumarate, and trivinyl citrate, N, N'-butylenebis (N-vinylacetamide), N, N'-diacetyl-N, N Bis (N-vinylcarboxylic acid amide) compounds such as '-divinyl-1,4-bisaminomethylcyclohexane, N, N'
-Methylenebisacrylamide, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth)
Compounds having a plurality of acrylamide structures and (meth) acrylic groups, such as acrylate, trimethylolpropane tri (meth) acrylate, and pentaerythritol tri (meth) acrylate; divinylbenzene, divinyl ether, allyl (meth) acrylate, etc. Any known crosslinking agent such as a compound having two or more unsaturated groups in one molecule can be used. In addition, one or more of these crosslinking agents can be used.

[0010] Other crosslinking methods include a method in which an uncrosslinked crosslinked precursor polymer is prepared in advance, and this is reacted with a functional group in the polymer to form a chemical bond. And various methods.
Examples of the crosslinking agent capable of forming a chemical bond by reacting with a functional group in a monomer and a polymer include polyglycidyl ether, polyisocyanate, polyamine, polyol, and polycarboxylic acid, depending on the functional group. Can be The amount of these crosslinking agents used is usually 90: 1 by weight ratio of monomer: crosslinking agent based on all monomers (excluding crosslinking agent).
It is selected from the range of 0 to 99.999: 0.001, with the range of 99: 1 to 99.995: 0.005 being particularly preferred. If the amount of the crosslinking agent is less than 0.005 by weight, the production of a water-soluble or hydrophilic polymer which does not participate in the crosslinking increases, and the effect as a water-absorbing resin cannot be exerted. On the other hand, when the weight ratio of the crosslinking agent is more than 10, the crosslinking density of the water-absorbent resin is increased, and the swelling ratio is undesirably reduced.

When the N-vinylamide-based crosslinked resin produced as described above is mixed with a fertilizer component to prepare a composition, the average particle size is generally 4 mmφ or less, preferably 2 mmφ or less, more preferably 1 mmφ or less. Is used. The shape of the powder is not particularly limited, and may be spherical or irregular. The poly-N-vinylacetamide-based crosslinked resin in the present invention is produced by a known aqueous solution polymerization method, reversed phase suspension polymerization method, precipitation polymerization method, or the like. The polymerization initiator used in the production of the (co) polymer cross-linked resin is a conventionally known peroxide, an organic or inorganic peracid or a salt thereof, an azobis compound alone, or a redox formed by a combination with a reducing agent. Azobisisobutyronitrile and azobis (2-amidinopropane) are particularly preferred.
Azobis initiators such as dihydrochloride. The amount of the polymerization initiator, the temperature at which the polymerization is initiated, and the reaction time may be the amounts used in a usual radical polymerization reaction. For example, the amount of the polymerization initiator used is 5 × 10
^The polymerization initiation temperature is about -10 to 80 ° C, and the reaction time is about 0.5 to 30 hours.

[0012] The fertilizer composition comprises, as fertilizer components, an inorganic fertilizer, an organic fertilizer, a trace component, etc.
It can be blended in any ratio depending on the plants to be grown, such as houseplants, fruit trees, and vegetables. The mixing ratio of the water-absorbent resin and the fertilizer component is 1 in total for both the water-absorbent resin and the fertilizer component.
As 00 parts by weight, 1 to 50 parts by weight of a water-absorbent resin and 50 to 99 parts by weight of a fertilizer component,
30 parts by weight, 70-95 parts by weight of the fertilizer component. More than 50 parts by weight of water-absorbent resin or 50 parts of fertilizer
If the amount is less than the weight part, the desired fertilizing effect cannot be obtained, which is not preferable.

Examples of the inorganic fertilizer include ammonium nitrate, sodium nitrate, potassium nitrate, lime nitrate, ammonium sulfate, potassium sulfate, ammonium monophosphate, potassium monophosphate, lime phosphate, ammonium chloride, potassium chloride, magnesium sulfate, Magnesium superphosphate, superphosphate lime,
Examples include urea and lime nitrogen, but are not limited thereto. Organic fertilizers include, for example, animal matter fertilizers such as fish cake, dried fish, bone meal, oil cakes such as rapeseed, soybeans, peanuts, castor oil, rice bran, and soy sauce cakes such as beer, whiskey, shochu, and sake. There are various types of plant fertilizers, dried cell fertilizers, etc., which are preferably mixed with a water-absorbent resin and formed into a form, for example, fine powder or pulverized.

Examples of the trace element fertilizer include compounds containing silicon, cobalt, vanadium, aluminum, etc., in addition to iron chelate, boric acid, manganese chelate, zinc chelate, molybdate and copper sulfate. Furthermore, N-
Nonionic water-absorbing resins other than vinylamide cross-linked resins, for example, polyacrylamide-based, polyethylene oxide-based, polyvinyl alcohol-based water-absorbing resins, organic soil improving materials such as crustaceans, shells, shell fossils, and other shellfish shells, peat, moss, etc. Peat humic acid material, root rot prevention material such as zeolite,
Various dyes and pigments for improving the appearance can be blended as required.

As a method for producing the fertilizer molded product using a water-absorbent resin and a fertilizer component, preferably, a water-absorbent resin powder and a fertilizer component are mixed, and water is added and kneaded, and the mixture is subjected to an extruder. After shaping into rods, pellets or granules, heating and drying, after mixing the water-absorbent resin powder and the fertilizer component with a fluid bed molding machine or a mixing and stirring molding machine,
A method of adding water to form a pellet or a granule, followed by heating and drying, and the like can be given. The molded product is classified if necessary to make the particle size uniform. At the time of extrusion molding, a binder such as CMC or polyvinyl alcohol may be added as necessary. In addition, when heating and drying the fertilizer molded product, it may be used as a raw dry state without completely evaporating water, after completely drying the molded product, absorb the liquid fertilizer again, immediate effect and slow effect It is good also as a fertilizer molding which had nature.

Since the molded article of the fertilizer of the present invention contains a water-absorbent resin and a fertilizer component, it has both a water-retaining effect by the water-absorbent resin and a growth promoting effect by the fertilizer component. Furthermore, since the water-absorbent resin and the fertilizer component are mixed and adjacent to each other, and the fertilizer component dissolved by watering is absorbed by the water-absorbing resin, it is possible to prevent the fertilizer component from flowing out of the cultivated soil due to watering, and to maintain good fertilization The effect appears. In addition, in the case of the fertilizer component alone, the fertilizer is excessively released into the soil during the initial stage of fertilization and may cause plant growth, but the fertilizer molded article of the present invention has a slow effect of the fertilizer when used in combination with the water absorbent resin. It can be kept and excessive plant growth can be suppressed. At present, in the agriculture field, there is a tendency that excessive fertilizer is added to the cultivation soil to promote the growth of vegetables, etc., and the groundwater is contaminated by the lost fertilizer and the human body due to the nitrate in the vegetables that incorporate a large amount of fertilizer The impact on the environment is becoming a problem. There is also concern that groundwater and rivers will be polluted by the loss of fertilizers sown on golf course lawns. The fertilizer molding of the present invention is also useful as a solution to the above problem.

[0017] The fertilizer molded product of the present invention comprises a plant, a foliage plant,
Used for cultivation of garden trees, lawns, fruit trees, vegetables, etc., Ando soil, Akadama soil, Kanuma soil, Pete moss, Vermiculite,
It is used by adding an appropriate amount to perlite, sand, mulch, bark compost, or a mixed culture soil thereof. There is no particular limitation on the method of addition, and it can be used by a method suitable for the target plant. For example, in the case of a container, a hanging basket, a potted flower, etc., when planting a plant, mix it evenly in the cultivation, or after putting a certain cultivation in a pot, spray a fertilizer molded article on it uniformly. It can be applied to a layered addition method, a method of growing as a top dressing, or a method of inserting it into a soil during flowering, and a method of placing it on a soil as a fertilizer. In particular,
In the case of a hanging basket in which the soil is easily dried because it is installed in the air, the fertilizer molded article of the present invention which contains a water-absorbent resin and has a water retaining ability is useful.

In the case of raising seedlings, a method in which the seedlings are uniformly mixed into the soil is applicable. In the case of garden trees and fruit trees, when planting, there is a method of sprinkling a fertilizer molding around the root pot and attaching it, a method of uniformly mixing it with the soil, and a method of adding it in a layer as an original fertilizer under the root pot. It can be applied to a method of mixing the soil into the soil at an appropriate distance from the tree as a top dressing, a method of placing an appropriate amount at the root of the tree as a fertilizer, and the like. In the case of lawns, especially western turf, a method of mixing the seeds with the soil,
A method of evenly spraying the soil on the turf of the upholstered lawn can be applied, and a method of spraying a fertilizer molded product having a fine particle size from the lawn during growth can also be applied.

[0019]

EXAMPLES The production examples and examples of the water-absorbent resin powder are shown below, but the present invention is not limited to these. (Production Example of N-Vinylamide Crosslinked Resin Powder) In a bath maintained at 30 ° C. in a three-necked 1 L separable flask equipped with a nitrogen inlet tube, a thermometer, and an exhaust tube, 250 g of N-vinylacetamide, N , N'-Diacetyl-N, N'-divinyl-1,4-bisaminomethylcyclohexane 1.6
g was dissolved in 740 g of deionized water, and nitrogen was introduced into the system at 1.0 L / min for about 1 hour to degas. Then degassed water 1
600 mg of 2,2′-azobis (2-amidinopropane) dihydrochloride dissolved in 0 mL was added, and the mixture was allowed to stand for 12 hours in an adiabatic system. The obtained gel was cut with a mincer and dried in vacuum at 50 ° C. for 12 hours, and then mechanically pulverized to obtain a crosslinked resin powder having a particle size of 1 mm or less. About 2 g of water-absorbent resin obtained
Was immersed in 1 L of deionized water (25 ° C.) or physiological saline (25 ° C.) for 2 hours with stirring, and the swollen water-absorbent resin was filtered off. When the saturated absorption capacity was calculated by the following equation, the absorption capacity of deionized water was 30 times its own weight, and the absorption capacity of physiological saline was 30 times its own weight. Absorption capacity = (weight of water-absorbent resin swollen / weight of water-absorbent resin charged) -1

Example 1 10 parts by weight of an N-vinylacetamide crosslinked resin (NA-150, manufactured by Showa Denko KK, having a particle size of 1 mmφ or less) and 90 parts by weight of a commercially available chemical fertilizer powder were thoroughly mixed, and then water 50 The mixture was added and kneaded while spraying parts by weight. Further, the kneaded product is supplied to a pre-extrusion-type granulator (mincer) equipped with a 4 mm hole diameter die, granulated, and dried overnight in a hot air drier at a temperature of 50 ° C. to obtain a particle size of 3 to 3.
A pellet-shaped molded product having a diameter of 5 mm and a length of 10 mm was obtained. Using a method of uniformly mixing this fertilizer molded product into the cultivation soil when transplanting marigold seedlings, conditions of giving water fertilization three times a week and liquid fertilization once a month outdoors in a sunny and sunny place Cultivated in. The test area under the above conditions
Compared to the test control group to which only the same kind of fertilizer was added, and the test control group to which only the water-absorbent resin was added, the growth state was clearly better, and both the height of the grass and the number of flowering exceeded the control group. 4 months after planting, the plant was dug up and the root growth was observed, but clearly better growth was observed in the test group to which the fertilizer molded article of the present invention was added as compared to the control group. .

Example 2 20 parts by weight of an N-vinylacetamide cross-linked resin (NA-150, manufactured by Showa Denko KK, particle size: 1 mmφ or less) and 80 parts by weight of a commercially available compound fertilizer powder were thoroughly mixed, and then 50 parts by weight of water The parts were added and kneaded while spraying. Further, after the kneaded product was granulated using a basket-type extrusion granulator equipped with a 2 mm hole diameter screen,
Dried overnight in a hot air dryer at a temperature of 50 ° C, particle size 1-3m
Granules having mφ were obtained. Sprinkle this fertilizer molded product around the root pot when transplanting marigold seedlings and then attach the fertilizer. Outdoors without sunny rain, irrigation frequency three times a week, once a month It was cultivated under the condition of liquid fertilizer. The test plots under the above conditions showed clearly better growth conditions than the test control plot to which only the same type of fertilizer was attached, and the test control plot to which only the water-absorbing resin was attached, and both the grass height and the number of flowers exceeded the control plot. Was. 4 after planting
When the months had passed, the plants were dug up to observe the growth of the roots, but clearly better growth was observed in the test plot to which the fertilizer molded article of the present invention was added as compared to the control plot.

Example 3 20 parts by weight of N-vinylacetamide cross-linked resin (NA-150, manufactured by Showa Denko KK, particle size: 1 mmφ or less), 10 parts by weight of zeolite powder, 10 parts by weight of crab shell powder, commercially available chemical fertilizer After sufficiently mixing 60 parts by weight of the powder with a fluidized bed granulator, 75 parts by weight of water in which a small amount of Food Blue No. 1 was dissolved as a coloring agent was added by spraying to perform granulation. This granulated product is placed in a fluidized bed granulator at a temperature of 5 ° C.
Drying was performed by introducing hot air at 0 ° C. to obtain blue granules having a particle size of 1 to 3 mmφ. This fertilizer molded article is uniformly mixed with cultivation soil when transplanting pansy seedlings into a hanging basket. Conditions for applying liquid fertilizer once a month when the topsoil is dried outdoors in a sunny and rain-free environment Cultivated in. The test plots under the above conditions showed clearly better growth than the test control plot where only the same type of fertilizer was added, the test control plot where only the water-absorbent resin was added, and the test control plot where zeolite, crab shell and fertilizer were added. Both height and number of flowers exceeded the control.

(Example 4) Using 40 parts by weight of an N-vinylacetamide crosslinked resin (NA-150 manufactured by Showa Denko KK, particle size of 1 mm or less) and 60 parts by weight of shochu squeeze using a stirring and stirring type granulator. After mixing well, 100 parts by weight of water was added while spraying to perform granulation. This granulated product,
Dry overnight in a hot air dryer at a temperature of 100 ° C.
A granule having a diameter of mmφ was obtained. This fertilizer molded product was planted in a sunny alley by a method of sprinkling around a root pot when transplanting the young tree of Ogon-konotegashiwa and cultivating it for one year without watering. The test plots under the above conditions showed clearly better growth than the test control plot where only the shochu squeezed cake dry powder was added and the test control plot where only the water-absorbent resin was added, and both the height and width of the grass exceeded the control plot.

Comparative Example 1 A fertilizer molded product was obtained in the same manner as in Example 1 except that 10 parts by weight of a crosslinked sodium acrylate was used instead of the N-vinylacetamide crosslinked resin. This fertilizer molding is uniformly mixed with the soil when transplanting marigold seedlings, under the conditions of applying water fertilization three times a week and liquid fertilization once a month outdoors in a sunny and sunny place. Cultivated. In the test plots under the above conditions, the soil was swollen due to excessive water absorption and swelling of the crosslinked sodium acrylate immediately after planting, and the soil was swollen from the pot. The cultivation test was continuously performed after removing the overburdened soil, but both the height of the grass and the number of flowering were significantly lower than those of the fertilizer molded article addition test section of Example 1 using the N-vinylacetamide cross-linked product. Was. After 4 months from planting, the plant was dug up and the root growth was observed. The fertilizer-molded test group of Example 1 clearly showed better growth, and the sodium acrylate In the test plot with the addition of the cross-linked fertilizer molded article, some root rot occurred.

[0025]

According to the present invention, it is possible to absorb a wide range of aqueous solutions such as high-concentration salt solutions such as fertilizers, and acidic water and alkaline water.
Further, N-vinylamide-based cross-linked resin as a water-absorbing resin having excellent heat resistance, light resistance, and characteristics of not causing germination and rooting inhibition on plants, and inorganic fertilizers, organic fertilizers and the like as fertilizer components. The fertilizer composition has a high fertilizing ability and also has a water retention property, is effective in preventing outflow, and can be formed into various shapes, so that it provides a fertilizer molded article which is easy to handle and easy to apply.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 17, 1999 (1999.3.1.
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by using a fertilizer composition containing a specific water-absorbing resin and a fertilizer component, and a molded article thereof, Have found that the above objectives can be achieved,
The present invention has been completed. That is, the present invention relates to the following matters. (1) The following general formula (I) is used as the water-absorbing resin.

Embedded image [Wherein R ₁ and R ₂ independently represent hydrogen or a methyl group, or R ₁ and R ₂ are bonded to each other to represent an alkylene group having 3 to 4 carbon atoms. Or an N-vinylamide-based crosslinked resin obtained by (co) polymerizing the monomer represented by the formula (1) or a monomer copolymerizable with the monomer with a crosslinking agent, and a fertilizer. A fertilizer composition comprising an inorganic fertilizer or an organic fertilizer as a component. (2) The fertilizer composition according to (1), comprising 1 to 50 parts by weight of an N-vinylamide-based crosslinked resin and 50 to 99 parts by weight of a fertilizer component in total. (3) The fertilizer composition according to the above (1) or (2), wherein the N-vinylamide-based crosslinked resin is an N-vinylacetamide-based crosslinked resin. (4) A fertilizer molded article obtained by molding the fertilizer composition according to any one of (1) to (3). (5) The fertilizer molded article according to the above (4), which is in the form of a rod, pellet, or granule.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011] Other crosslinking methods include a method in which a non-crosslinked precursor polymer is prepared in advance, and this is reacted with a functional group in the polymer to form a chemical bond. And various methods.
Examples of the crosslinking agent capable of forming a chemical bond by reacting with a functional group in a monomer and a polymer include polyglycidyl ether, polyisocyanate, polyamine, polyol, and polycarboxylic acid, depending on the functional group. Can be The amount of these crosslinking agents used is usually 90: 1 by weight ratio of monomer: crosslinking agent based on all monomers (excluding crosslinking agent).
It is selected from the range of 0 to 99.999: 0.001, with the range of 99: 1 to 99.995: 0.005 being particularly preferred. If the amount of the crosslinking agent is less than 0.001 in weight ratio, the production of a water-soluble or hydrophilic polymer which does not participate in crosslinking increases, and the effect of the water-absorbing resin cannot be substantially exerted. On the other hand, when the weight ratio of the crosslinking agent is more than 10, the crosslinking density of the water-absorbent resin is increased, and the swelling ratio is undesirably reduced.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4H061 DD15 EE27 EE35 FF08 FF11 FF12 GG33 HH05 HH07 HH14 4J002 AD031 AE051 AH001 BJ001 BJ002 DD056 DF006 DF036 DG046 DH046 DJ006 DK006 ET016 EZ006 GA00

Claims (5)

[Claims] 1. A water-absorbing resin represented by the following general formula (I): [Wherein R ₁ and R ₂ independently represent hydrogen or a methyl group, or R ₁ and R ₂ are bonded to each other to represent an alkylene group having 3 to 4 carbon atoms. Using a cross-linking agent, or a monomer represented by the formula
A fertilizer composition comprising an N-vinylamide-based crosslinked resin obtained by polymerization and an inorganic or organic fertilizer as a fertilizer component. 2. The fertilizer composition according to claim 1, comprising 1 to 50 parts by weight of the N-vinylamide crosslinked resin and 50 to 99 parts by weight of the fertilizer component in total. 3. The fertilizer composition according to claim 1, wherein the N-vinylamide-based crosslinked resin is an N-vinylacetamide-based crosslinked resin. 4. A fertilizer molded article obtained by molding the fertilizer composition according to claim 1. 5. The fertilizer molded product according to claim 4, which is in the form of a rod, a pellet, or a granule.