CN113264805A - Cellulose modified polyurethane coated fertilizer and preparation method and application thereof - Google Patents
Cellulose modified polyurethane coated fertilizer and preparation method and application thereof Download PDFInfo
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- CN113264805A CN113264805A CN202110699687.2A CN202110699687A CN113264805A CN 113264805 A CN113264805 A CN 113264805A CN 202110699687 A CN202110699687 A CN 202110699687A CN 113264805 A CN113264805 A CN 113264805A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
Abstract
The invention provides a cellulose modified polyurethane coated fertilizer and a preparation method and application thereof, wherein the preparation method of the cellulose modified polyurethane coated fertilizer comprises the following steps: (1) mixing cellulose, polyether polyol and a catalyst for reaction to obtain liquefied cellulose; (2) mixing liquefied cellulose, polyisocyanate and liquid paraffin to obtain modified polyurethane, and then mixing the modified polyurethane with a fertilizer to coat to obtain the cellulose modified polyurethane coated fertilizer. The cellulose modified polyurethane coated fertilizer provided by the invention has the advantages of low production cost, long controlled release period and good degradability.
Description
Technical Field
The invention belongs to the field of fertilizers, and particularly relates to a cellulose modified polyurethane coated fertilizer and a preparation method and application thereof, in particular to a cellulose modified polyurethane coated fertilizer with a long release period and a preparation method and application thereof.
Background
The nitrogen fertilizer is agriculturalThe key agricultural chemical input in the industry has the contribution rate of 50 percent to grain production, but the unreasonable use of nitrogen fertilizer also causes serious nutrient loss and environmental hazard. The controlled release fertilizer can effectively improve the nutrient utilization rate of the nitrogen fertilizer and reduce the influence on the environment. For example, the controlled release fertilizer can effectively increase crop yield and reduce N in dry land Chinese cabbage and irrigated corn2And (4) discharging O. Ideally, the nitrogen release rate of the controlled release fertilizer is approximately synchronized with the nitrogen demand of the crop. The current coating materials for controlled release fertilizers are mainly sulfur-based coating materials, polymer-based coating materials, super absorbent/water-retentive coating materials, bio-composite coating materials, and commercially used controlled release coatings. Because the polymer coating material is expensive, the popularization and the application of the polymer coating material in field production are influenced to a certain extent. In addition, the non-biodegradability of the coating material also limits the use of controlled release fertilizers.
Currently, the bio-based materials used for polyurethane coated fertilizers are mainly natural bio-based polyols. Plant fibers include cellulose, lignin, hemicellulose, and the like. Lignin alone has 3 building blocks (guaiacyl, syringyl and p-hydroxyphenyl) and 4 typical bonding modes, and is currently utilized mainly by functional group modification. Natural products such as natural fibers (wood fibers, straws) and the like have complex structures, and decomposition products obtained by simple treatment comprise various oligosaccharides and uronic acid. The decomposition product has complex components, and the direct utilization can seriously affect the controlled release performance of the coating material.
CN105646090B discloses a controlled release fertilizer prepared by modifying agricultural organic wastes into degradable films and a preparation method thereof; uniformly mixing agricultural organic waste, a liquefying agent and a catalyst, liquefying and modifying the mixture to obtain a coating material to obtain a coated controlled-release fertilizer; the coated controlled-release fertilizer produced by the invention has good and accurate controlled-release performance, and the controlled-release period of the nutrients of the product can be controlled within 1-6 months by adjusting the thickness of the coating. Meanwhile, the product produced by the invention adopts agricultural organic waste as a raw material, and the raw material is a renewable resource, can be degraded when applied to soil, and is an environment-friendly material. The product adopts a novel renewable coating material, so that the coating material gets rid of dependence on chemical materials such as petroleum, reduces resource waste and realizes sustainable development.
CN107082692A discloses a modified papermaking black liquor bio-based coated controlled release fertilizer and a preparation method thereof, which comprises the steps of adding dilute sulfuric acid or dilute hydrochloric acid into papermaking black liquor for neutralization to neutrality, concentrating and drying to prepare powder, adding a liquefier for liquefaction to prepare a papermaking black liquor liquefact, then adding a modifier for modification of the liquefact, uniformly mixing the modified liquefact and a curing agent according to the weight ratio of 1:0.1-10 to obtain a coating material, spraying the coating material on the surface of a granulated fertilizer under a certain pressure, and curing and forming a film at 10-100 ℃ for 1-10 minutes to prepare the bio-based polyurethane coated controlled release fertilizer. According to the nutrient controlled release period required by crops, the weight of the coating material is adjusted to be 1-10% of the total weight of the granular fertilizer. The invention is a novel controlled release fertilizer coating method with wide source of membrane materials, low price, low energy consumption, simple coating process, easy degradation of the membrane materials, low cost and environmental protection.
Because the components of the decomposition products of the prior controlled release fertilizer are complex, the direct utilization can seriously affect the controlled release performance of the coating material. Therefore, how to provide a controlled release fertilizer with long slow release period and good degradability becomes a problem to be solved urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a cellulose modified polyurethane coated fertilizer and a preparation method and application thereof, and particularly provides a cellulose modified polyurethane coated fertilizer with a long release period and a preparation method and application thereof. The cellulose modified polyurethane coated fertilizer provided by the invention has the advantages of low production cost, long controlled release period and good degradability.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a preparation method of a cellulose-modified polyurethane coated fertilizer, which comprises the following steps:
(1) mixing cellulose, polyether polyol and a catalyst for reaction to obtain liquefied cellulose;
(2) mixing liquefied cellulose, polyisocyanate and liquid paraffin to obtain modified polyurethane, and then mixing the modified polyurethane with a fertilizer to perform coating reaction to obtain the cellulose modified polyurethane coated fertilizer.
The cellulose modified polyurethane coated fertilizer prepared by the specific modified polyurethane prepared by adopting the reaction of the cellulose and the polyether glycol has the advantages of low dissolution rate, long controlled release period, good degradability and low production cost.
Preferably, the cellulose of step (1) comprises powdered cellulose and/or fibrous cellulose.
Preferably, the powdered cellulose includes any one or a combination of at least two of alkyl-substituted cellulose, carboxymethyl cellulose, and hydroxyethyl methyl cellulose, for example, a combination of alkyl-substituted cellulose and carboxymethyl cellulose, a combination of carboxymethyl cellulose or hydroxyethyl methyl cellulose, or a combination of alkyl-substituted cellulose and hydroxyethyl methyl cellulose, and the like, but is not limited to the above-listed combinations, and other combinations not listed within the above-mentioned combination range are also applicable.
Preferably, the fibrous cellulose comprises carboxylated cellulose nanofibers.
Preferably, the cellulose is carboxymethyl cellulose.
The modified polyurethane obtained by selecting the specific cellulose can improve the controlled release period of the cellulose modified polyurethane coated fertilizer and reduce the dissolution rate, and meanwhile, the biomass cellulose is adopted as a coating material, so that the degradability of the coating material is improved.
Preferably, the polyether polyol in step (1) includes any one or a combination of at least two of polyoxyethylene polyol, polyoxypropylene polyol, polymer polyol or polytetrahydrofuran, such as a combination of polyoxyethylene polyol and polyoxypropylene polyol, a combination of polyoxypropylene polyol and polymer polyol or a combination of polymer polyol and polytetrahydrofuran, but not limited to the above-listed combinations, and other combinations not listed within the above-mentioned combinations are also applicable.
Preferably, the catalyst in step (1) comprises any one or a combination of at least two of sulfuric acid, nitric acid, phosphoric acid, activated alumina, silica or rare earth oxide, such as a combination of sulfuric acid and nitric acid, a combination of nitric acid and phosphoric acid, or a combination of sulfuric acid and phosphoric acid, but is not limited to the above-listed combinations, and other combinations not listed in the above-mentioned combinations are also applicable.
Preferably, the mixing in step (1) further comprises mixing with an auxiliary agent, the auxiliary agent comprises any one or a combination of at least two of ethylene glycol, propylene glycol, glycerol, butanediol, pentanediol or paraffin wax, such as a combination of ethylene glycol and propylene glycol, a combination of propylene glycol and glycerol, or a combination of butanediol and pentanediol, but is not limited to the above-listed combinations, and other combinations not listed in the above-mentioned combination range are also applicable.
Preferably, the mass ratio of the cellulose, the polyether polyol, the catalyst and the auxiliary in the step (1) is (10-30): (90-110): (3-8): (5-15), wherein the part of the cellulose can be 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 or 30, etc., the part of the polyether polyol can be 90, 92, 94, 96, 98, 100, 102, 104, 106, 108 or 110, etc., the part of the catalyst can be 3, 4, 5, 6, 7 or 8, etc., the part of the auxiliary can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, etc., but is not limited to the above-listed values, and the other values in the above-mentioned value range are also applicable.
Preferably, the polyisocyanate in step (2) includes any one or a combination of at least two of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, 1,4 cyclohexane diisocyanate, xylylene diisocyanate, cyclohexane dimethylene diisocyanate, or trimethyl-1, 6-hexamethylene diisocyanate, such as a combination of toluene diisocyanate and diphenylmethane diisocyanate, a combination of isophorone diisocyanate and hexamethylene diisocyanate, or a combination of naphthalene diisocyanate and p-phenylene diisocyanate, and the like, but is not limited to the above-listed combinations, and other combinations not listed in the above-mentioned combination range are also applicable.
Preferably, the fertilizer in step (2) includes any one or a combination of at least two of a nitrogen fertilizer, a phosphorus fertilizer or a potassium fertilizer, such as a combination of a nitrogen fertilizer and a phosphorus fertilizer, a combination of a phosphorus fertilizer and a potassium fertilizer, or a combination of a nitrogen fertilizer and a potassium fertilizer, and the like, but is not limited to the above-listed combinations, and other combinations not listed in the above-mentioned combination range are also applicable.
Preferably, the mass-to-volume ratio of the fertilizer to the liquid paraffin in the step (2) is (450- & ltSUB & gt 500- & lt SUB & gt) (1-5) & lt SUB & gt g/mL.
Preferably, the mass ratio of the fertilizer to the modified polyurethane in the step (2) is (90-100) to (3-6).
Preferably, the molar ratio of-NCO to-OH in the modified polyurethane in the step (2) is 1 (0.9-1.1).
In the mass-to-volume ratio of the fertilizer to the liquid paraffin, the parts of the fertilizer may be 450, 460, 470, 480, 490, or 500, the parts of the liquid paraffin may be 1, 2, 3, 4, or 5, the parts of the fertilizer may be 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100, the parts of the modified polyurethane may be 3, 4, 5, or 6, the molar ratio of-NCO to-OH may be 1:0.9, 1:1, or 1:1.1, but the present invention is not limited thereto, and other values not listed in the above-mentioned range of values are also applicable.
In a second aspect, the invention provides a cellulose-modified polyurethane coated fertilizer prepared by the method for preparing a cellulose-modified polyurethane coated fertilizer.
In a third aspect, the invention also provides application of the cellulose modified polyurethane coated fertilizer in preparation of a controlled release fertilizer.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a cellulose modified polyurethane coated fertilizer, which is prepared by reacting cellulose with polyether polyol to obtain specific modified polyurethane, and has the advantages of low dissolution rate, long controlled release period, good degradability and low production cost; meanwhile, the modified polyurethane prepared by selecting specific cellulose can improve the controlled release period of the cellulose modified polyurethane coated fertilizer and reduce the dissolution rate; the biomass cellulose is used as the coating material, so that the degradability of the coating material is improved.
Drawings
FIG. 1 is an infrared spectrum of a mixture of carboxymethyl cellulose, liquefied cellulose, general polyurethane, polyisocyanate and liquefied cellulose in example 1.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In the following examples, polyoxyethylene polyols are available from Xuzhou bright Ciyan New materials, Inc. under the model number PEG-200;
polyoxypropylene polyol available from Vanhua Chemicals (Beijing) Ltd, model number
R8349；
Polytetrahydrofuran was purchased from wanhua chemical (beijing) ltd and has a model number PTMG 250;
carboxymethyl cellulose was purchased from michelin reagent, model C804618;
the methyl propyl cellulose is available from Wenzhou tide chemical industry Co., Ltd, and is HT-E50;
hydroxyethyl methylcellulose is available from dow chemical, model MW 40000 PFV;
carboxylated cellulose nanofibers were purchased from michelin reagent, model No. C875077.
Example 1
The embodiment provides a cellulose modified polyurethane coated fertilizer, which is prepared by the following steps:
20 parts of carboxymethyl cellulose, 100 parts of polyoxyethylene polyol, 10 parts of ethylene glycol and 5 parts of sulfuric acid are mixed, then the mixture is quickly heated to 160 ℃ for reaction for 90 minutes, and after the solvent becomes brownish black liquid and is cooled to 25 ℃, the graft copolymerization of the cellulose and the polyether polyol is realized, and the liquefied cellulose is obtained. 480g of urea were poured into the fluidized bed and preheated for 15 minutes at 85 ℃. After completion of the preheating, 3mL of liquid paraffin was added, and then 25g of a mixture containing toluene diisocyanate and liquefied cellulose (n (NCO): n (OH): 1) was slowly added dropwise to the fluidized bed to carry out the urea coating reaction. After the reaction is finished for 15 minutes, and the cellulose modified polyurethane coated fertilizer is prepared after urea particles are completely coated.
Example 2
The embodiment provides a cellulose modified polyurethane coated fertilizer, which is prepared by the following steps:
10 parts of carboxylated cellulose nano-fiber, 110 parts of polyoxypropylene polyol, 5 parts of glycerol and 8 parts of phosphoric acid are mixed, the temperature is quickly raised to 160 ℃ for reaction for 90 minutes, and after the solvent becomes brownish black liquid and is cooled to 25 ℃, the graft copolymerization of the cellulose and the polyether polyol is realized, and the liquefied cellulose is obtained. 500g of urea were poured into the fluidized bed and preheated for 15 minutes at 85 ℃. After completion of the preheating, 5mL of liquid paraffin was added, and then 30g of a mixture containing p-phenylene diisocyanate and liquefied cellulose (n (NCO): n (OH): 1) was slowly added dropwise to the fluidized bed to carry out the urea coating reaction. After the reaction is finished for 15 minutes, and the cellulose modified polyurethane coated fertilizer is prepared after urea particles are completely coated.
Example 3
The embodiment provides a cellulose modified polyurethane coated fertilizer, which is prepared by the following steps:
30 parts of methyl propyl cellulose, 90 parts of polytetrahydrofuran, 15 parts of butanediol and 3 parts of nitric acid are mixed, the mixture is quickly heated to 160 ℃ to react for 90 minutes, and after the solvent becomes brownish black liquid and is cooled to 25 ℃, the graft copolymerization of the cellulose and the polyether glycol is realized, and the liquefied cellulose is obtained. 450g of urea was poured into the fluidized bed and preheated for 15 minutes at 85 ℃. After completion of the preheating, 1mL of liquid paraffin was added, and then 15g of a mixture containing diphenylmethane diisocyanate and liquefied cellulose (n (NCO): n (OH): 1) was slowly added dropwise to the fluidized bed to conduct a urea coating reaction. After the reaction is finished for 15 minutes, and the cellulose modified polyurethane coated fertilizer is prepared after urea particles are completely coated.
Example 4
This example provides a cellulose-modified polyurethane coated fertilizer, which was prepared in a manner consistent with example 1, except that carboxymethyl cellulose was replaced with equivalent amount of carboxylated cellulose nanofibers.
Example 5
This example provides a cellulose-modified polyurethane coated fertilizer, which was prepared in a manner consistent with example 1, except that carboxymethyl cellulose was replaced with the same amount of hydroxyethyl methyl cellulose.
Example 6
This example provides a cellulose-modified polyurethane coated fertilizer, which was prepared in a manner consistent with example 1, except that carboxymethyl cellulose was replaced with an equivalent amount of methyl propyl cellulose.
Comparative example 1
The comparative example provides a polyurethane coated fertilizer, the preparation method comprising:
480g of urea were poured into the fluidized bed and preheated for 15 minutes at 85 ℃. After completion of the preheating, 3mL of liquid paraffin was added, and then 25g of a mixture containing polyisocyanate and polyether polyol (n (NCO): n (OH): 1) was slowly added dropwise to the fluidized bed to carry out the urea coating reaction. And (3) after the reaction is finished for 15 minutes, and completely coating the urea particles to prepare the polyurethane coated fertilizer.
Comparative example 2
The comparative example provides a polyurethane coated fertilizer, the preparation method comprising:
20 parts of carboxymethyl cellulose and 100 parts of polyether polyol were mixed to obtain a mixture A. 480g of urea were poured into the fluidized bed and preheated for 15 minutes at 85 ℃. After completion of the preheating, 3mL of liquid paraffin was added, and then 25g of a mixture containing polyisocyanate and mixture A (n (NCO): n (OH): 1) was slowly added dropwise to the fluidized bed to conduct the urea coating reaction. And (3) after the reaction is finished for 15 minutes, and completely coating the urea particles to prepare the polyurethane coated fertilizer.
Comparative example 3
A commercially available coated fertilizer.
And (3) effect testing:
the infrared spectrum of carboxymethyl cellulose, liquefied cellulose, and general polyurethane in example 1 was analyzed with a mixture of polyisocyanate and liquefied cellulose (i.e., modified polyurethane), and the results are shown in FIG. 1.
As can be seen from the figure, the liquefied cellulose is at 1091cm-1、3409cm-1A hydroxyl absorption peak appears, which indicates that the carboxymethyl cellulose and the polyether polyol realize graft copolymerization, and the hydroxyl content is increased because of the polyhydroxy structure of the carboxymethyl cellulose. Compared with liquefied cellulose, the modified polyurethane is 2900cm-1、2800cm-1The absorption peaks near the peak were sharper, indicating that the hydroxyl groups of the liquefied cellulose were sufficiently involved in the reaction. Compared with the common polyurethane, the modified polyurethane is 3500cm in 3200--1、1683cm-1、1522-1530cm-1The absorption peak of the carbamate bond is observed, which proves that the modified polyurethane is successfully prepared at 1731cm-1Carbonyl absorption peaks were observed, indicating that carboxymethyl cellulose is well involved in the formation of the modified polyurethane material.
The coated fertilizers provided in examples 1-6 and comparative examples 1-3 were then tested for dissolution rate and release period, and the results were as follows, referring to HG/T4216-2011:
| group of | Initial dissolution Rate (%) | Differential dissolution rate (%) | Release period (Tian) |
| Example 1 | 1.14 | 0.56 | 141 |
| Example 2 | 1.89 | 0.79 | 100 |
| Example 3 | 1.98 | 0.88 | 90 |
| Example 4 | 1.09 | 0.59 | 135 |
| Example 5 | 1.49 | 0.63 | 126 |
| Example 6 | 1.63 | 0.66 | 120 |
| Comparative example 1 | 11.62 | 0.90 | 77 |
| Comparative example 2 | 27.17 | 8.81 | 7 |
| Comparative example 3 | 1.53 | 0.88 | 90 |
The results show that the cellulose modified polyurethane coated fertilizer provided by the invention has low dissolution rate and longer release period; comparing examples 1 and 4-6, the invention can find that the release period of the cellulose modified polyurethane coated fertilizer is further improved by optimizing specific cellulose, and the dissolution rate is reduced; comparing example 1 with comparative examples 1-2, it can be found that the release period of the cellulose modified polyurethane coated fertilizer is prolonged and the dissolution rate is reduced compared with that of the common polyurethane by modifying the polyurethane with cellulose; comparing example 1 with comparative example 3, it can be found that the cellulose modified polyurethane coated fertilizer provided by the invention has lower fertilizer dissolution rate and longer release period compared with the prior art, and can meet the requirements of people.
The applicant states that the invention is illustrated by the above examples to the cellulose modified polyurethane coated fertilizer of the invention and the preparation method and application thereof, but the invention is not limited to the above examples, that is, the invention is not meant to be implemented only by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
Claims (10)
1. A preparation method of a cellulose modified polyurethane coated fertilizer is characterized by comprising the following steps:
(1) mixing cellulose, polyether polyol and a catalyst for reaction to obtain liquefied cellulose;
(2) mixing liquefied cellulose, polyisocyanate and liquid paraffin to obtain modified polyurethane, and then mixing the modified polyurethane with a fertilizer to perform coating reaction to obtain the cellulose modified polyurethane coated fertilizer.
2. The method for producing a cellulose-modified polyurethane coated fertilizer according to claim 1, wherein the cellulose of step (1) comprises powdered cellulose and/or fibrous cellulose;
preferably, the powdered cellulose comprises any one of or a combination of at least two of alkyl-substituted cellulose, carboxymethyl cellulose, or hydroxyethyl methyl cellulose;
preferably, the fibrous cellulose comprises carboxylated cellulose nanofibers;
preferably, the cellulose is carboxymethyl cellulose.
3. The method for preparing a cellulose-modified polyurethane coated fertilizer according to claim 1 or 2, wherein the polyether polyol of step (1) comprises any one of or a combination of at least two of polyoxyethylene polyol, polyoxypropylene polyol, polymer polyol or polytetrahydrofuran.
4. The method for producing a cellulose-modified polyurethane coated fertilizer according to any one of claims 1 to 3, wherein the catalyst of step (1) comprises any one or a combination of at least two of sulfuric acid, nitric acid, phosphoric acid, activated alumina, silica, or a rare earth oxide.
5. The method for preparing a cellulose modified polyurethane coated fertilizer according to any one of claims 1 to 4, wherein the mixing of step (1) further comprises mixing with an auxiliary agent, wherein the auxiliary agent comprises any one or a combination of at least two of ethylene glycol, propylene glycol, glycerol, butanediol, pentanediol or paraffin;
preferably, the mass ratio of the cellulose, the polyether glycol, the catalyst and the auxiliary agent in the step (1) is (10-30): (90-110): (3-8): (5-15).
6. The method for producing a cellulose-modified polyurethane coated fertilizer according to any one of claims 1 to 5, wherein the polyisocyanate of step (2) comprises any one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, naphthalene diisocyanate, p-phenylene diisocyanate, 1,4 cyclohexane diisocyanate, xylylene diisocyanate, cyclohexanedimethylene diisocyanate, or trimethyl-1, 6-hexamethylene diisocyanate, or a combination of at least two thereof.
7. The method for producing a cellulose-modified polyurethane coated fertilizer according to any one of claims 1 to 6, wherein the fertilizer of step (2) comprises any one of a nitrogen fertilizer, a phosphorus fertilizer or a potassium fertilizer or a combination of at least two of them.
8. The method for preparing the cellulose modified polyurethane coated fertilizer as claimed in any one of claims 1 to 7, wherein the mass-to-volume ratio of the fertilizer to the liquid paraffin in the step (2) is (450- & 500): 1-5) g/mL;
preferably, the mass ratio of the fertilizer to the modified polyurethane in the step (2) is (90-100) to (3-6);
preferably, the molar ratio of-NCO to-OH in the modified polyurethane in the step (2) is 1 (0.9-1.1).
9. The cellulose-modified polyurethane coated fertilizer prepared by the method for preparing the cellulose-modified polyurethane coated fertilizer according to any one of claims 1 to 8.
10. Use of the cellulose-modified polyurethane coated fertilizer of claim 9 in the preparation of a controlled release fertilizer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115043688A (en) * | 2022-06-20 | 2022-09-13 | 华南农业大学 | Organic silicon modified activated lignin-based coating material and preparation method thereof, and coated fertilizer |
| CN115286461A (en) * | 2022-07-19 | 2022-11-04 | 广西壮族自治区林业科学研究院 | Novel medicinal material slow-release fertilizer and preparation method thereof |
| CN116375531A (en) * | 2023-03-30 | 2023-07-04 | 中国农业科学院农业资源与农业区划研究所 | Temperature-sensitive polyurethane coated controlled-release fertilizer and preparation method thereof |
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