CN117658721A - Water-absorbing and water-retaining double-layer coated urea sustained and controlled release fertilizer and preparation method thereof - Google Patents
Water-absorbing and water-retaining double-layer coated urea sustained and controlled release fertilizer and preparation method thereof Download PDFInfo
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- CN117658721A CN117658721A CN202311635646.2A CN202311635646A CN117658721A CN 117658721 A CN117658721 A CN 117658721A CN 202311635646 A CN202311635646 A CN 202311635646A CN 117658721 A CN117658721 A CN 117658721A
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- water
- parts
- absorbing
- release fertilizer
- coating
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 82
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000004202 carbamide Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000013268 sustained release Methods 0.000 title claims description 25
- 238000013270 controlled release Methods 0.000 title claims description 22
- 230000002459 sustained effect Effects 0.000 title claims description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 80
- 238000000576 coating method Methods 0.000 claims abstract description 80
- 229920005989 resin Polymers 0.000 claims abstract description 51
- 239000011347 resin Substances 0.000 claims abstract description 51
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 40
- 235000009566 rice Nutrition 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 27
- 239000002250 absorbent Substances 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000004593 Epoxy Substances 0.000 claims abstract description 21
- 230000000813 microbial effect Effects 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 19
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 11
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 11
- 239000000661 sodium alginate Substances 0.000 claims abstract description 11
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 10
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000003346 palm kernel oil Substances 0.000 claims abstract description 10
- 235000019865 palm kernel oil Nutrition 0.000 claims abstract description 10
- SVYHMICYJHWXIN-UHFFFAOYSA-N 2-[di(propan-2-yl)amino]ethyl 2-methylprop-2-enoate Chemical compound CC(C)N(C(C)C)CCOC(=O)C(C)=C SVYHMICYJHWXIN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 9
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 9
- 239000003999 initiator Substances 0.000 claims abstract description 9
- 239000000944 linseed oil Substances 0.000 claims abstract description 7
- 235000021388 linseed oil Nutrition 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 241000209094 Oryza Species 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 35
- 238000001035 drying Methods 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 25
- 230000002745 absorbent Effects 0.000 claims description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000012258 culturing Methods 0.000 claims description 15
- 238000007873 sieving Methods 0.000 claims description 13
- 241000194108 Bacillus licheniformis Species 0.000 claims description 12
- 244000063299 Bacillus subtilis Species 0.000 claims description 12
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 10
- 239000001963 growth medium Substances 0.000 claims description 10
- 239000012730 sustained-release form Substances 0.000 claims description 10
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 7
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 6
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000011218 seed culture Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000009736 wetting Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 238000012986 modification Methods 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 17
- 235000015097 nutrients Nutrition 0.000 description 16
- 230000001105 regulatory effect Effects 0.000 description 8
- 240000008042 Zea mays Species 0.000 description 7
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 206010016807 Fluid retention Diseases 0.000 description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 6
- 235000005822 corn Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 241000238631 Hexapoda Species 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 230000000844 anti-bacterial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 241000607479 Yersinia pestis Species 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 235000019750 Crude protein Nutrition 0.000 description 1
- 229920000858 Cyclodextrin Polymers 0.000 description 1
- 239000007836 KH2PO4 Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- HPTYUNKZVDYXLP-UHFFFAOYSA-N aluminum;trihydroxy(trihydroxysilyloxy)silane;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O[Si](O)(O)O HPTYUNKZVDYXLP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 235000019784 crude fat Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 235000015872 dietary supplement Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910052621 halloysite Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000009973 maize Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- 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
-
- 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
- C05G3/60—Biocides or preservatives, e.g. disinfectants, pesticides or herbicides; Pest repellants or attractants
-
- 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
-
- 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
- C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
-
- 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
- C05G5/38—Layered or coated, e.g. dust-preventing coatings layered or coated with wax or resins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Plant Pathology (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a water-absorbing and water-retaining double-layer coated urea slow-release fertilizer and a preparation method thereof, and belongs to the technical field of slow-release fertilizers. The slow-release fertilizer with the water-absorbing and water-retaining double-layer coating film takes 60-80 parts of urea as an inner core, 10-15 parts of epoxy-based hydrophobically modified rice hull fiber resin as an inner layer coating film, and the composite super-absorbent resin prepared from 20-30 parts of corncob powder, 12-15 parts of bentonite, 8-10 parts of sodium alginate, 13-18 parts of acrylic acid, 5-8 parts of a promoter, 10-12 parts of linseed oil, 2-5 parts of an initiator, 3-8 parts of a crosslinking agent, 3-5 parts of a solubilizer and 6-8 parts of a microbial agent as an outer layer coating film. The diisopropylaminoethyl methacrylate is added in the hydrophobic modification process of the inner coating film, so that the hydrophobicity and controllability are enhanced; the palm kernel oil diethanolamide used as the accelerator for the outer coating film enhances the compression resistance, water absorption and water retention performances, and the microbial agent is added, so that the fertilizer utilization rate is improved, and the yield and quality of crops are increased.
Description
Technical Field
The invention belongs to the technical field of sustained and controlled release fertilizers, and particularly relates to a water-absorbing and water-retaining double-layer coated urea sustained and controlled release fertilizer and a preparation method thereof.
Background
Agricultural fertilizer application amount climbs year by year, however, the on-season utilization rate of the fertilizer is generally lower, especially urea, is lower due to volatilization, leaching and runoff, and high fertilizer application amount not only causes waste of the fertilizer, but also causes pollution to water resources, causes hardening of soil, and causes serious problems.
Rice hulls and corncobs are rich agricultural byproducts in China, the surfaces of the rice hulls are hard and are not easy to decompose by bacteria, the rice hulls contain about 40% of crude fibers, 20% of five-carbon sugar polymers, 20% of ash and a small amount of crude protein crude fat and other nutritional ingredients, however, most of the rice hulls are wasted or are directly applied to the ground, so that resource waste is caused; corncob is a byproduct of threshing corn cob, has advantages of uniform tissue, proper hardness, good toughness, strong water absorbability, good wear resistance and the like, however, most corncob cannot be effectively utilized, and most corncob is directly abandoned or dried in rural areas to be used as fire burning fuel, so that the utilization rate is low.
Along with the progress of science, the concept of the slow and controlled release fertilizer is gradually applied to agricultural production, the slow and controlled release fertilizer is divided into three categories, namely coating, wrapping and synthesizing, wherein the coated slow and controlled release fertilizer is mainly composed of a fertilizer core and a coating layer, on the other hand, moisture is an important factor for restricting the agricultural development, not only influencing the growth of crops, but also playing an important role in playing a fertilizer effect, so that the coated slow and controlled release fertilizer and a water retaining agent are combined together to develop the water-absorbing and water-retaining slow and controlled release fertilizer so as to realize the mutual promotion of water cost, improve the soil structure and improve the fertilizer utilization rate, and become a main trend of fertilizer production development.
According to the preparation method of the multifunctional composite water-retaining slow-release fertilizer disclosed in the patent CN107162747B, a coating material is prepared by taking cyclodextrin, a water-soluble monomer, halloysite loaded with urea, a cross-linking agent and an initiator as raw materials through free radical polymerization, wherein the water-soluble monomer absorbs a large amount of water when nutrients are released, however, the strength of a coating film is lower, sudden swelling and explosion can be generated, so that a large amount of nutrients are released, and the coating film is a single-layer coating film, only the water absorption performance is reserved, the slow control performance is poor, the slow control time is short and the slow control is not easy to control. Although the organic high polymer coated fertilizer has good nutrient release control effect, after the nutrient is released, the organic polymer empty shell remained in the soil is difficult to degrade, and the soil environment is polluted after the organic high polymer coated fertilizer is applied for many years. Therefore, the prepared coated film sustained and controlled release fertilizer has the advantages of environmental protection, high water absorption and retention, high compressive strength and good sustained and controlled release fertilizer, and has important significance for the development of agricultural fertilizers. .
Disclosure of Invention
The invention overcomes the defects of the prior art, and discloses a water-absorbing and water-retaining double-layer coating film sustained and controlled release fertilizer, which uses rice hulls and corncob powder as raw materials of an outer coating film, wherein the inner coating film is used for carrying out hydrophobic and controllable modification on the fertilizer by using epoxy resin and diisopropylaminoethyl methacrylate; the palm kernel oil diethanolamide is used as an accelerator for the outer coating film to enhance the compression resistance, water absorption and water retention properties of the outer coating film, and the microbial agent is added to enhance the insect resistance and the antibacterial effect of crops, improve the fertilizer utilization rate and increase the yield and the quality of crops.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the slow-release fertilizer with the water-absorbing and water-retaining double-layer coating film takes 60-80 parts of urea as an inner core, 10-15 parts of epoxy-based hydrophobically modified rice hull fiber resin as an inner layer coating film, and the composite super-absorbent resin prepared from 20-30 parts of corncob powder, 12-15 parts of bentonite, 8-10 parts of sodium alginate, 13-18 parts of acrylic acid, 5-8 parts of a promoter, 2-5 parts of an initiator, 3-8 parts of a crosslinking agent, 3-5 parts of a solubilizer and 6-8 parts of a microbial agent as an outer layer coating film.
The preparation method of the epoxy hydrophobically modified rice hull fiber resin comprises the following steps:
40-60 parts of rice hulls, cleaning, removing impurities, drying until the water content is less than 5%, crushing, grinding, sieving with a 200-mesh sieve, soaking with hydrochloric acid with the mass fraction of 1.5% for 24 hours, filtering, adding into a reaction container, adding distilled water with the volume of 2-3 times of that of the rice hulls, heating and stirring for 30 minutes at 53-68 ℃, sequentially adding 10-20 parts of epoxy resin, 15-30 parts of rosin and 2-5 parts of diisopropylaminoethyl methacrylate, regulating the pH to 8-10 by using a sodium hydroxide solution with the mass concentration of 1mol/L, heating and stirring for 2-5 hours at 110-150 ℃, regulating the pH to be neutral by using a hydrochloric acid solution with the mass fraction of 1.5%, heating and stirring to be viscous at 80-85 ℃, drying and crushing to obtain the epoxy hydrophobic modified rice hull fiber resin.
The preparation method of the composite super absorbent resin comprises the following steps:
adding corncob powder and bentonite into a reaction kettle, adding distilled water with 3-5 times of volume, stirring for 30-45min at 85 ℃, adding maleic anhydride, stirring for 15-20min at 40-45 ℃, sequentially adding acrylic acid and palm kernel oil diethanolamide, heating and stirring for 2-3h at 40-60 ℃, sequentially adding sodium alginate, initiator potassium persulfate and cross-linking agent N, N-methylene bisacrylamide, heating and stirring for 2-3h at 70-90 ℃, drying, crushing, sieving, and adding microbial agents to obtain the composite super absorbent resin;
the microbial agent is a mixture of bacillus subtilis and bacillus licheniformis according to the mass ratio of 1:1 of culture solution, and the preparation method comprises the following steps: culturing bacillus subtilis and bacillus licheniformis in a liquid seed culture medium at 30 ℃ for 24 hours respectively, inoculating 10% of the bacillus subtilis and bacillus licheniformis into an LB culture medium respectively, culturing under shaking at 30 ℃ until the concentration of bacteria is OD600 apprxeq 3.0, and then culturing according to the following steps of 1:1, uniformly mixing the culture solutions in mass ratio, and freeze-drying to obtain freeze-dried powder to obtain the microbial agent.
Preferably, the promoter is palm kernel oil diethanolamide.
Preferably, the initiator is potassium persulfate.
Preferably, the crosslinking agent is N, N-methylenebisacrylamide.
Preferably, the solubilizer is maleic anhydride.
The invention also provides a preparation method of the water-absorbing water-retaining double-layer coating film sustained-release fertilizer, which comprises the following steps:
adding urea into a coating machine, spraying atomized water to uniformly wet the urea, adding epoxy hydrophobically modified rice hull fiber resin in a molten state for coating for 3-5 times, uniformly coating the epoxy hydrophobically modified rice hull fiber resin on the surface of the urea, and drying for 24-48 hours after coating is finished; and (3) adding the coated dry particles into a coating machine, wetting the surfaces of the particles by atomized linseed oil, adding molten composite super absorbent resin for coating for 3-5 times, uniformly coating the surfaces of the particles with the composite super absorbent resin, and drying for 24-48 hours after coating is finished to obtain the water-absorbing water-retaining double-layer coated film sustained and controlled release fertilizer with the particle size of 3-5 mm.
The water-absorbing water-retaining double-layer coating film sustained-release fertilizer provided by the invention has the following beneficial effects:
according to the invention, urea is subjected to inner-layer and outer-layer double-layer coating, the inner-layer coating is subjected to hydrophobic and controllable modification on fertilizer, the outer-layer coating is prepared from corncob powder, bentonite, sodium alginate and acrylic acid as raw materials, and a water-absorbing and water-retaining resin is prepared by adding an accelerator, so that the coating is coated, compared with the prior art, the hydrophobic degree of hydrophobic modification is increased by adding a pH-sensitive hydrophobic monomer diisopropylaminoethyl methacrylate in the hydrophobic modification process of the inner-layer coating, meanwhile, the controllability of fertilizer release is ensured, citric acid is secreted from roots when crops lack nutrients, the pH around the roots is reduced, and the accelerated release of nutrients is promoted; when the crops are not deficient in nutrients, no acidic component is generated around the roots, and the inner-layer coating film can control and reduce the release of the nutrients; the surface active agent palm kernel oil diethanolamide is added in the preparation process of the outer coating film to serve as an accelerator, so that the firmness of cross-linking combination of the graft copolymer corn cob powder, bentonite, sodium alginate and acrylic acid is enhanced, the compressive strength of the fertilizer is improved, and meanwhile, the water absorption and the water retention of the coating film are obviously improved; the selected raw materials of rice hulls and corncob powder are natural and environment-friendly, and waste resources are utilized; the added microbial agent improves the insect resistance and the antibacterial property of crops; the inner coating film and the outer coating film are combined to carry out double-layer coating on the fertilizer, so that nutrients are not easy to run off, the fertilizer efficiency is more durable, the nutrient release accords with the growth rule of crops, the utilization rate of the fertilizer is greatly improved, the water absorption and water retention characteristics are improved, the crop income and the yield are increased, and the planting benefit is improved.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are to be construed as merely illustrative of the invention and not limiting of its scope, as various equivalent modifications to the invention will fall within the scope of the claims of the application after reading the invention.
Example 1
(1) And (3) preparing a microbial agent:
culturing bacillus subtilis and bacillus licheniformis in a liquid seed culture medium at 30 ℃ for 24 hours respectively, inoculating 10% of the bacillus subtilis and bacillus licheniformis into an LB culture medium respectively, culturing under shaking at 30 ℃ until the concentration of bacteria is OD600 apprxeq 3.0, and then culturing according to the following steps of 1:1, uniformly mixing the materials in a mass ratio, and freeze-drying the materials into freeze-dried powder to obtain a microbial agent;
(2) Preparing epoxy hydrophobically modified rice hull fiber resin:
cleaning 50g of rice hulls, removing impurities, carrying out ventilation drying until the water content is less than 5%, crushing and grinding, sieving with a 200-mesh sieve, soaking with hydrochloric acid with the mass fraction of 1.5% for 24 hours, filtering, adding into a reaction container, adding distilled water with the volume being 3 times that of the rice hulls, heating and stirring for 30 minutes at 53 ℃, sequentially adding 15g of epoxy resin, 20g of rosin and 3g of diisopropylaminoethyl methacrylate, adding a sodium hydroxide solution with the mass concentration of 1mol/L, regulating the pH to 8, heating and stirring for 2 hours at 110 ℃, regulating the pH to be neutral with a hydrochloric acid solution with the mass fraction of 1.5%, heating and stirring at 80 ℃ until the solution is viscous, drying and crushing, and sieving with a 100-mesh sieve to obtain the epoxy group hydrophobically modified rice hull fiber resin;
(3) Preparing composite super absorbent resin:
adding 25g of corncob powder and 15g of bentonite into a reaction kettle, adding 3 times of distilled water, stirring for 30min at 85 ℃, adding 5g of maleic anhydride, stirring for 15min at 40 ℃, sequentially adding 15g of acrylic acid and 5g of palm kernel oil diethanolamide, heating and stirring for 2h at 40 ℃, sequentially adding 10g of sodium alginate, 2g of initiator potassium persulfate and 5g of cross-linking agent N, N-methylene bisacrylamide, heating and stirring for 2h at 70 ℃, drying, crushing and sieving with a 100-mesh sieve to obtain composite super absorbent resin;
(4) Coating film
Adding 80g of urea into a coating machine, spraying atomized water to uniformly wet the urea, adding epoxy hydrophobically modified rice hull fiber resin in a molten state for coating for 3 times, uniformly coating the epoxy hydrophobically modified rice hull fiber resin on the surface of the urea, and drying for 24 hours after coating is finished; and (3) adding the coated dry particles into a coating machine, wetting the surfaces of the particles by atomized linseed oil, adding molten composite super absorbent resin for coating for 5 times, uniformly coating the composite super absorbent resin on the surfaces of the particles, and drying for 48 hours after coating is finished to obtain the water-absorbing water-retaining double-layer coated film sustained and controlled release fertilizer with the particle diameter of 5 mm.
Example 2
(1) And (3) preparing a microbial agent:
culturing bacillus subtilis and bacillus licheniformis in a liquid seed culture medium at 30 ℃ for 24 hours respectively, inoculating 10% of the bacillus subtilis and bacillus licheniformis into an LB culture medium respectively, culturing under shaking at 30 ℃ until the concentration of bacteria is OD600 apprxeq 3.0, and then culturing according to the following steps of 1:1, uniformly mixing the materials in a mass ratio, and freeze-drying the materials into freeze-dried powder to obtain a microbial agent;
(2) Preparing epoxy hydrophobically modified rice hull fiber resin:
cleaning 60g of rice hulls, removing impurities, carrying out ventilation drying until the water content is less than 5%, crushing and grinding, sieving with a 200-mesh sieve, soaking with hydrochloric acid with the mass fraction of 1.5% for 24 hours, filtering, adding into a reaction container, adding distilled water with the volume being 3 times that of the rice hulls, heating and stirring for 30 minutes at 53 ℃, sequentially adding 20g of epoxy resin, 15g of rosin and 5g of diisopropylaminoethyl methacrylate, adding a sodium hydroxide solution with the mass concentration of 1mol/L, regulating the pH to 9, heating and stirring for 2 hours at 110 ℃, regulating the pH to be neutral with a hydrochloric acid solution with the mass fraction of 1.5%, heating and stirring at 80 ℃ until the solution is viscous, drying and crushing, and sieving with a 100-mesh sieve to obtain the epoxy group hydrophobically modified rice hull fiber resin;
(3) Preparing composite super absorbent resin:
adding 20g of corncob powder and 12g of bentonite into a reaction kettle, adding distilled water with the volume being 5 times that of the corncob powder, stirring for 30min at the temperature of 85 ℃, adding 5g of maleic anhydride, stirring for 15min at the temperature of 40 ℃, sequentially adding 13g of acrylic acid and 8g of palm kernel oil diethanolamide, heating and stirring for 2h at the temperature of 40 ℃, sequentially adding 8g of sodium alginate, 5g of potassium persulfate and 3g of N, N-methylene bisacrylamide, heating and stirring for 2h at the temperature of 70 ℃, drying, crushing and sieving with a 100-mesh sieve to obtain the composite super absorbent resin;
(4) Coating film
Adding 80g of urea into a coating machine, spraying atomized water to uniformly wet the urea, adding epoxy hydrophobically modified rice hull fiber resin in a molten state for coating for 3 times, uniformly coating the epoxy hydrophobically modified rice hull fiber resin on the surface of the urea, and drying for 24 hours after coating is finished; and (3) adding the coated dry particles into a coating machine, wetting the surfaces of the particles by atomized linseed oil, adding molten composite super absorbent resin for coating for 5 times, uniformly coating the composite super absorbent resin on the surfaces of the particles, and drying for 48 hours after coating is finished to obtain the water-absorbing water-retaining double-layer coated film sustained and controlled release fertilizer with the particle diameter of 3 mm.
Example 3
(1) And (3) preparing a microbial agent:
culturing bacillus subtilis and bacillus licheniformis in a liquid seed culture medium at 30 ℃ for 24 hours respectively, inoculating 10% of the bacillus subtilis and bacillus licheniformis into an LB culture medium respectively, culturing under shaking at 30 ℃ until the concentration of bacteria is OD600 apprxeq 3.0, and then culturing according to the following steps of 1:1, uniformly mixing the materials in a mass ratio, and freeze-drying the materials into freeze-dried powder to obtain a microbial agent;
(2) Preparing epoxy hydrophobically modified rice hull fiber resin:
cleaning 40g of rice hulls, removing impurities, carrying out ventilation drying until the water content is less than 5%, crushing and grinding, sieving with a 200-mesh sieve, soaking with hydrochloric acid with the mass fraction of 1.5% for 24 hours, filtering, adding into a reaction container, adding distilled water with the volume of 2 times, heating and stirring at 53 ℃ for 30 minutes, sequentially adding 10g of epoxy resin, 30g of rosin and 2g of diisopropylaminoethyl methacrylate, adding a sodium hydroxide solution with the mass concentration of 1mol/L, regulating the pH to 10, heating and stirring at 110 ℃ for 2 hours, regulating the pH to be neutral with a hydrochloric acid solution with the mass fraction of 1.5%, heating and stirring at 80 ℃ until the solution is viscous, drying and crushing, and sieving with a 100-mesh sieve to obtain the epoxy group hydrophobically modified rice hull fiber resin;
(3) Preparing composite super absorbent resin:
adding 30g of corncob powder and 15g of bentonite into a reaction kettle, adding 3 times of distilled water, stirring for 30min at 85 ℃, adding 3g of maleic anhydride, stirring for 15min at 40 ℃, sequentially adding 18g of acrylic acid and 5g of palm kernel oil diethanolamide, heating and stirring for 2h at 40 ℃, sequentially adding 10g of sodium alginate, 3g of potassium persulfate and 8g of N, N-methylene bisacrylamide, heating and stirring for 2h at 70 ℃, drying, crushing and sieving with a 100-mesh sieve to obtain composite super absorbent resin;
(4) Coating film
Adding 80g of urea into a coating machine, spraying atomized water to uniformly wet the urea, adding epoxy hydrophobically modified rice hull fiber resin in a molten state for coating for 3 times, uniformly coating the epoxy hydrophobically modified rice hull fiber resin on the surface of the urea, and drying for 24 hours after coating is finished; and (3) adding the coated dry particles into a coating machine, wetting the surfaces of the particles by atomized linseed oil, adding molten composite super absorbent resin for coating for 5 times, uniformly coating the composite super absorbent resin on the surfaces of the particles, and drying for 48 hours after coating is finished to obtain the water-absorbing water-retaining double-layer coated film sustained and controlled release fertilizer with the particle diameter of 5 mm.
Comparative example 1
In this comparative example, the procedure of example 1 was exactly the same as that of example 1 except that diisopropylaminoethyl methacrylate and rosin were not added during the preparation of the epoxy hydrophobically modified rice hull fiber resin.
Comparative example 2
In this comparative example, as compared with example 1, acrylic acid and potassium persulfate were not added during the preparation of the composite super absorbent resin, and the rest of the procedure was exactly the same as in example 1.
Comparative example 3
Compared with the example 1, the comparative example has no maleic anhydride or sodium alginate added in the preparation process of the composite super absorbent resin, and the rest of the operation process is identical to the example 1.
Comparative example 4
In this comparative example, as compared with example 1, no palm kernel oil diethanolamide or N, N-methylenebisacrylamide was added during the preparation of the composite super absorbent resin, and the rest of the procedure was exactly the same as in example 1.
Comparative example 5
The sulfur-coated urea (total nitrogen content is more than or equal to 26%) produced by Shandong Miao International fertilizer company is commercially available, and the comparative fertilizer is a common urea coated film fertilizer in the market.
Detection experiment
The coated urea controlled release fertilizers prepared in examples 1 to 3 and comparative examples 1 to 5 were each 30g, and the performance of each coated urea controlled release fertilizer in terms of the release period, water absorption, water retention, annual biodegradation and mechanical strength was examined.
The slow release period detection is carried out according to the national standard of slow release fertilizer (GB/T23148-2009), wherein the release rate of the fertilizer for 24 hours, the accumulated release rate of the fertilizer for 7 days, the accumulated release rate of the fertilizer for 28 days and the release time of the fertilizer for 80 percent are detected; the water absorption of the fertilizer adopts a nylon net bag method, and the value (g/g) of the mass change quantity before and after water absorption saturation is calculated; the soil water retention adopts a soil column method, the same infiltration distance is measured, the influence of the fertilizer on infiltration amount is measured, and the infiltration amount is based on the descending height (cm) of the water level of a Margaret bottle; the annual biodegradability is measured by a soil burying method, and the mass loss rate (%) after burying for one year is measured; the mechanical strength detection adopts a fertilizer granule strength tester (sensitivity is 0.1N) to detect the bearing pressure of the crushed fertilizer granules; the specific detection results are shown in table 1:
table 1 performance test table
According to the detection result, the slow-release fertilizer with the water-absorbing and water-retaining double-layer coating film prepared in the embodiment 1-3 of the invention obviously improves the slow-release energy of urea, the average time of 80% fertilizer nutrient released by static water at 25 ℃ is 43 days, which is superior to that of commercial sulfur-coated urea, the initial nutrient release rate of 8% and the accumulated nutrient release rate of 52% in 28 days after soaking in static water at 5 ℃ for 24 hours, and the slow-release fertilizer is less than 15% in initial nutrient release rate of less than 80% after soaking in static water at 25 ℃ for 24 hours according to the national standard (GB/T23148-2009) stipulation of slow-release fertilizer, and the accumulated nutrient release rate of 28 days is less than 80% according to the national standard; the double-layer coated urea slow-release fertilizer can absorb water which is 5-6 times of the mass of the fertilizer, has excellent water retention effect and is obviously superior to a control group; the coating film prepared from a large amount of rice hulls and corncob powder can be decomposed by microbial agents, the annual degradation rate is close to 90%, and the environment is protected; and the fertilizer has high compressive strength, can bear 30-35N pressure, has excellent performance and high utilization rate of urea nutrient.
Field experiments
The urea coated fertilizer prepared in the invention examples 1-3 and comparative examples 1-5 are respectively used for 40 mu land of a home farm of Feng Xuan in the corresponding city of hand-over Luo Zhuangou, 40 mu land of the farm is divided into 8 pieces, each 5 mu land is used for planting corn (corn seeds are purchased from Chongqing Jin Dechong company-golden glutinous No. 1), the coated urea sustained-release fertilizer prepared in the invention examples 1-3 and comparative examples 1-5 is respectively applied to the 8 lands according to 35Kg per mu, and the fertilizer is applied together once a year during sowing in spring, the distance between the seeds and the fertilizer is 6-8 cm, so as to avoid burning out the seeds, and nutrient supplements of phosphate fertilizer and potash fertilizer are as follows: 30Kg of monopotassium phosphate (purchased from Shandong Xinbori biotechnology Co., ltd., KH2PO4 content is not less than 98%) is applied to each mu; the nitrogenous fertilizer used in 8 experimental fields of the experiment is the urea coated film sustained and controlled release fertilizer prepared in the examples 1-3 and the comparative examples 1-5 of the invention, and other field management is the same and is daily field management; after harvesting, the plumpness of the seeds, the acre yield, the insect pest and death of the seedlings are counted, and the results are shown in Table 2:
TABLE 2 maize growth harvest conditions
Compared with comparative examples 1-5, the water-absorbing and water-retaining double-layer coated urea sustained and controlled release fertilizer prepared by the invention in examples 1-3 has higher utilization rate of urea fertilizer efficiency, plump seeds, and enhanced antibacterial and insect-resistant effects of plant seedlings by introducing microbial agents and pesticides in the preparation process of the coating film, the thousand grain weight, acre yield, insect pests and plant seedling death conditions of corn cultivated in the fields in examples 1-3 are all better than the application effects of the coated urea in the commercially available comparative example 5, the number of rotten and dead plant seedlings is obviously reduced, the yield is obviously improved, and according to the statistical results, the average acre yield of corn 773Kg is improved by 19.2 Kg compared with the application effects of the coated urea in comparative example 5.
It should be noted that the above-mentioned embodiments are merely some, but not all embodiments of the preferred mode of carrying out the invention. It is evident that all other embodiments obtained by a person skilled in the art without making any inventive effort, based on the above-described embodiments of the invention, shall fall within the scope of protection of the invention.
Claims (9)
1. The slow-release fertilizer with the water-absorbing and water-retaining double-layer coating film takes 60-80 parts of urea as an inner core, 10-15 parts of epoxy-based hydrophobically modified rice hull fiber resin as an inner layer coating film, and the composite super-absorbent resin prepared from 20-30 parts of corncob powder, 12-15 parts of bentonite, 8-10 parts of sodium alginate, 13-18 parts of acrylic acid, 5-8 parts of a promoter, 10-12 parts of linseed oil, 2-5 parts of an initiator, 3-8 parts of a crosslinking agent, 3-5 parts of a solubilizer and 6-8 parts of a microbial agent as an outer layer coating film.
2. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to claim 1, wherein the preparation method of the epoxy-based hydrophobically modified rice hull fiber resin is as follows: 40-60 parts of rice hulls, cleaning, removing impurities, drying until the water content is less than 5%, crushing, grinding, sieving with a 200-mesh sieve, soaking with hydrochloric acid with the mass fraction of 1.5% for 24 hours, filtering, adding into a reaction container, adding distilled water with the volume of 2-3 times of that of the rice hulls, heating and stirring for 30 minutes at 53-68 ℃, sequentially adding 10-20 parts of epoxy resin, 15-30 parts of rosin and 2-5 parts of diisopropylaminoethyl methacrylate, adjusting the pH to 8-10 by using a sodium hydroxide solution with the mass concentration of 1mol/L, heating and stirring for 2-5 hours at 110-150 ℃, adjusting the pH to be neutral by using a hydrochloric acid solution with the mass fraction of 1.5%, heating and stirring to be viscous at 80-85 ℃, drying and crushing to obtain the epoxy hydrophobic modified rice hull fiber resin.
3. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to claim 1, wherein the preparation method of the composite super absorbent resin is as follows: adding corncob powder and bentonite into a reaction kettle, adding distilled water with 3-5 times of volume, stirring for 30-45min at 85 ℃, adding a solubilizer, stirring for 15-20min at 40-45 ℃, sequentially adding acrylic acid and an accelerator, heating and stirring for 2-3h at 40-60 ℃, sequentially adding sodium alginate, an initiator and a cross-linking agent, heating and stirring for 2-3h at 70-90 ℃, drying, crushing, sieving, and adding a microbial agent to obtain the composite super absorbent resin.
4. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to claim 1, wherein the microbial agent is a mixture of bacillus subtilis and bacillus licheniformis according to a mass ratio of 1:1 of culture solution; the preparation method of the microbial agent comprises the following steps: culturing bacillus subtilis and bacillus licheniformis in a liquid seed culture medium at 30 ℃ for 24 hours respectively, inoculating 10% of the bacillus subtilis and bacillus licheniformis into an LB culture medium respectively, culturing under shaking at 30 ℃ until the concentration of bacteria is OD600 apprxeq 3.0, and then culturing according to the following steps of 1:1, uniformly mixing the culture solutions in mass ratio, and freeze-drying to obtain freeze-dried powder to obtain the microbial agent.
5. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to any one of claims 1 to 4, wherein the accelerator is palm kernel oil diethanolamide.
6. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to any one of claims 1 to 4, wherein the initiator is potassium persulfate.
7. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to any one of claims 1 to 4, wherein the cross-linking agent is N, N-methylenebisacrylamide.
8. The water-absorbing and water-retaining double-layer coated film sustained-release fertilizer according to any one of claims 1 to 4, wherein the solubilizing agent is maleic anhydride.
9. A method for preparing the water-absorbing and water-retaining double-layer coated film sustained and controlled release fertilizer according to any one of claims 1 to 8, comprising the following steps:
adding urea into a coating machine, spraying atomized water to uniformly wet the urea, adding epoxy hydrophobically modified rice hull fiber resin in a molten state for coating for 3-5 times, uniformly coating the epoxy hydrophobically modified rice hull fiber resin on the surface of the urea, and drying for 24-48 hours after coating is finished; and (3) adding the coated dry particles into a coating machine, wetting the surfaces of the particles by atomized linseed oil, adding molten composite super absorbent resin for coating for 3-5 times, uniformly coating the surfaces of the particles with the composite super absorbent resin, and drying for 24-48 hours after coating is finished to obtain the water-absorbing water-retaining double-layer coated film sustained and controlled release fertilizer with the particle size of 3-5 mm.
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| CN106064998A (en) * | 2016-01-31 | 2016-11-02 | 华南理工大学 | A kind of starch base High hydrophilous resin environment-friendly type slow release fertilizer and preparation method thereof |
| CN107382454A (en) * | 2017-07-17 | 2017-11-24 | 扬州大学 | A kind of preparation method of double film multifunctional creep Controlled Release Fertilizers |
| CN112645754A (en) * | 2020-12-07 | 2021-04-13 | 甘肃中医药大学 | Slow-release material and slow-release fertilizer using traditional Chinese medicine waste as raw material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106064998A (en) * | 2016-01-31 | 2016-11-02 | 华南理工大学 | A kind of starch base High hydrophilous resin environment-friendly type slow release fertilizer and preparation method thereof |
| CN107382454A (en) * | 2017-07-17 | 2017-11-24 | 扬州大学 | A kind of preparation method of double film multifunctional creep Controlled Release Fertilizers |
| CN112645754A (en) * | 2020-12-07 | 2021-04-13 | 甘肃中医药大学 | Slow-release material and slow-release fertilizer using traditional Chinese medicine waste as raw material and preparation method thereof |
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