CN115490560A - Accurate controlled release membrane material and application thereof - Google Patents
Accurate controlled release membrane material and application thereof Download PDFInfo
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- CN115490560A CN115490560A CN202210888625.0A CN202210888625A CN115490560A CN 115490560 A CN115490560 A CN 115490560A CN 202210888625 A CN202210888625 A CN 202210888625A CN 115490560 A CN115490560 A CN 115490560A
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- 238000013270 controlled release Methods 0.000 title claims abstract description 108
- 239000000463 material Substances 0.000 title claims abstract description 65
- 239000012528 membrane Substances 0.000 title claims description 52
- 239000003337 fertilizer Substances 0.000 claims abstract description 98
- 238000000576 coating method Methods 0.000 claims abstract description 72
- 239000011248 coating agent Substances 0.000 claims abstract description 70
- 239000007788 liquid Substances 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 36
- 239000004202 carbamide Substances 0.000 claims description 36
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 28
- 239000002994 raw material Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000002904 solvent Substances 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000003995 emulsifying agent Substances 0.000 claims description 8
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical group FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000001593 sorbitan monooleate Substances 0.000 claims description 6
- 235000011069 sorbitan monooleate Nutrition 0.000 claims description 6
- 229940035049 sorbitan monooleate Drugs 0.000 claims description 6
- 229920002785 Croscarmellose sodium Polymers 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 229920005862 polyol Polymers 0.000 claims description 5
- 150000003077 polyols Chemical class 0.000 claims description 5
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 5
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 5
- 235000011151 potassium sulphates Nutrition 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 150000002513 isocyanates Chemical class 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 3
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 3
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 2
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 239000001103 potassium chloride Substances 0.000 claims description 2
- 235000011164 potassium chloride Nutrition 0.000 claims description 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 2
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims 1
- 229920002451 polyvinyl alcohol Polymers 0.000 claims 1
- 235000015097 nutrients Nutrition 0.000 abstract description 40
- 230000008961 swelling Effects 0.000 abstract description 18
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000003094 microcapsule Substances 0.000 abstract description 4
- 239000012773 agricultural material Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000002105 nanoparticle Substances 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 241000209094 Oryza Species 0.000 description 46
- 235000007164 Oryza sativa Nutrition 0.000 description 46
- 235000009566 rice Nutrition 0.000 description 46
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 238000012360 testing method Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 230000012010 growth Effects 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 7
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000000575 pesticide Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 238000003306 harvesting Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 239000005696 Diammonium phosphate Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical group [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 3
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 3
- 235000019838 diammonium phosphate Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000007970 homogeneous dispersion Substances 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 238000003973 irrigation Methods 0.000 description 3
- 230000002262 irrigation Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002088 nanocapsule Substances 0.000 description 3
- 239000002686 phosphate fertilizer Substances 0.000 description 3
- 229940072033 potash Drugs 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 3
- 235000015320 potassium carbonate Nutrition 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003971 tillage Methods 0.000 description 3
- 238000009333 weeding Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- NNJPGOLRFBJNIW-HNNXBMFYSA-N (-)-demecolcine Chemical compound C1=C(OC)C(=O)C=C2[C@@H](NC)CCC3=CC(OC)=C(OC)C(OC)=C3C2=C1 NNJPGOLRFBJNIW-HNNXBMFYSA-N 0.000 description 1
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical group C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000004117 Lignosulphonate Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 239000012868 active agrochemical ingredient Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000019357 lignosulphonate Nutrition 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to the field of novel agricultural materials, and particularly provides an accurate controlled release film material and application thereof. The nutrient release rate of the controlled-release fertilizer can be accurately regulated by regulating the addition amount of the nano water-absorbing microcapsules, the nutrient controlled-release period is 50-90 days, and the nutrient can be accurately released to meet the requirement of the maximum nutrient demand period of crops on nutrients; the used coating liquid and the water swelling type nano particles are used as coating materials, so that the coating liquid has the characteristics of low price, rich sources and the like, and cannot generate environmental pollution; the invention has simple processing technology, low energy consumption and high efficiency, and belongs to a low-energy technology.
Description
Technical Field
The invention relates to the field of novel agricultural materials, and particularly provides an accurate controlled-release film material and application thereof.
Background
At present, the low utilization rate of fertilizer nutrients is a main problem in agricultural production in China and causes the pollution problem of water, atmosphere and soil. The coated controlled release fertilizer can greatly improve the nutrient utilization rate, which can reach 80 percent at most, and is listed as one of the agricultural main pushing technologies by the ministry of agriculture. In recent years, the slow controlled release fertilizer industry in China is developed rapidly, more than 20 units in China participate in the research and development and application work of the slow controlled release fertilizer, the output and sales volume exceeds 2100 million tons, the popularization area is about 5.25 hundred million acres, and the expenditure saving and income increasing is 1100 million.
However, the mismatching of the nutrient release rule of the coated controlled-release fertilizer and the fertilizer requirement rule of crops limits the further popularization and application of the fertilizer. How to realize the accurate release of the nutrients of the slow-release fertilizer and release the nutrients of the fertilizer accurately when crops need the nutrients, so as to achieve the maximization of the nutrient utilization efficiency is a research focus to be solved urgently at present. The research and development of the coated controlled-release fertilizer with nutrients capable of being released at regular time and capable of achieving an accurate controlled-release effect become a research focus in the field of novel fertilizer research and development.
At present, the related patents on timed release are mostly focused on the field of medicine, mostly in the form of micro-nano capsules coating the medicament, such as 200710037076.1, 201310178489.7, 201310426145.3, 201710664741.3, 201210081020.7, 201610679565.6, 201610998279.6, but such micro-nano capsules have obvious disadvantages: (1) The dosage of the membrane shell is large, the micro-nano capsule is mostly adopted, the dosage of the membrane material accounts for 70 percent of the coated medicament, and the production cost is extremely high; (2) The membrane material is prepared by physically mixing a plurality of substances, and the membrane shell can be disintegrated after being soaked in water for a short time due to extremely unstable water. Therefore, the action time of the product is very short, usually only 1-2 hours, and the fertilizer requirement characteristics of crops in the agricultural field for 50-90 days cannot be met. (3) The rupture principle of the envelope shell is not clear, the above patents do not show the timing release principle, the rupture principle and mechanism of the envelope shell are not clear, the purpose of precise controlled release cannot be achieved, the timing cannot be completely intelligent, and the envelope shell can only be regarded as a sustained-release material.
There are also few patents related to timed release of particulate materials, such as: patent 201780040718.5 discloses a granular agricultural pesticide of timed-release type whose core is the agrochemical active ingredient a), the swelling substance b) and, as the case may be, the carrier c), the surfactant d) and the other auxiliaries g; the coating is a binder e), a hydrophobic substance f), a carrier c). According to the patent, a material capable of absorbing water and swelling is added into pesticide granules to prepare pesticide tablet core granules, and then coating is carried out to prepare coated pesticide tablet core granule products. After the product absorbs water, the water-absorbing material in the tablet core continuously absorbs water at the center to swell, so that the membrane shell is torn, and then the effective components are released into water. The disadvantages of this release are: the release is destructive, particularly, the tearing at which position of the membrane shell cannot be controlled, the size of a gap generated by the tearing cannot be controlled, once the membrane shell is torn, the effective ingredients can be completely released in a very short time, and the release is not accurate controlled release, but is instantaneous destructive release, so that the aim of accurate controlled release cannot be achieved. Moreover, the dosage of the membrane shell is extremely large, the highest dosage can reach 70 percent, and the production cost is extremely high.
Disclosure of Invention
The invention provides an accurate controlled release membrane material and application thereof aiming at various defects in the prior art, and particularly provides an accurate controlled release membrane material and application thereof. The nutrient release rate of the controlled-release fertilizer can be accurately regulated by regulating the addition amount of the nano water-absorbing microcapsules, the nutrient controlled-release period is 50-90 days, and the nutrient can be accurately released to meet the requirement of the maximum nutrient demand period of crops on nutrients; the used coating liquid and the water swelling type nano particles are used as coating materials, so that the coating liquid has the characteristics of low price, rich sources and the like, and cannot generate environmental pollution; the invention has simple processing technology, low energy consumption and high efficiency, and belongs to a low-energy technology.
The specific technical scheme of the invention is as follows:
an accurate controlled release membrane material comprises raw materials of a nano-grade prepolymer A and a coating liquid B, wherein the nano-grade prepolymer A accounts for 1-20% of the coating liquid B by weight;
the prepolymer A is selected from one or more of starch grafted acrylate, high-substitution-degree crosslinked carboxymethyl cellulose, crosslinked carboxymethyl lignosulfonate-grafted acrylamide and crosslinked hydroxyethyl lignosulfonate-grafted acrylamide polymers; the preferable prepolymer A is high-substitution-degree cross-linked carboxymethyl cellulose; are all directly purchased in the market;
the process for preparing the nano prepolymer A comprises the following steps:
adding the raw material prepolymer A into a 500mL three-neck round-bottom flask, taking chloroform as a solvent, performing homogeneous dispersion for 10min by a dispersion machine at room temperature and a rotating speed of 2000r/min, and then performing freeze drying to obtain nano-grade prepolymer A powder; the product reaches the nanometer level through the detection of a scanning electron microscope, the homogeneous dispersion time cannot be too long, and the excessive polymerization degree of the prepolymer is prevented; the ratio of prepolymer A to chloroform was 1.
The particle size distribution of the nano-grade prepolymer A prepared by the method is 1-100 nanometers; the preferred particle size is 10-20nm.
The coating liquid B is selected from one or more of a polyether polyol and isocyanate blend (mass ratio of 1 to 1), a chloroform solvent-dissolved polyethylene solution (solvent mass: solute mass = 6; the preferable coating solution B is a polyethylene solution dissolved in a chloroform solvent (solvent mass: solute mass = 6.
Preferably, the prepolymer A accounts for 3% of the weight of the envelope liquid B;
the preparation method of the precise controlled release film material comprises the following steps:
at room temperature, adding the nano-grade prepolymer A into the coating liquid B according to the mass ratio of 1-20%, then adding an emulsifier of sorbitan monooleate, and stirring for 2min by magnetic force at the rotating speed of 600r/min, so that the nano-grade prepolymer A is fully emulsified and dispersed in the coating liquid B to obtain a uniformly blended controlled-release coating liquid C, namely the precise controlled-release coating; the product is detected by a scanning electron microscope, and the nano-grade prepolymer A achieves nano-grade dispersion in the membrane material.
The emulsifier sorbitan monooleate accounts for 0.05 percent of the weight of the envelope liquid B;
on the basis of obtaining the film material, the inventor applies the film material to the preparation of the controlled release coated fertilizer, and the specific steps are as follows:
adding the granular fertilizer D into a coating pot which continuously rotates, preheating the granular fertilizer to 60 ℃, uniformly spraying a coating liquid C on the surface of the preheated granular fertilizer D at the pressure of 0.3MPa according to the proportion of 5 percent of the total weight of the fertilizer, and forming a layer of uniformly distributed solid controlled-release membrane shell on the surface of the granular fertilizer after the liquid controlled-release membrane material is solidified; thereby obtaining the accurate controlled release coated fertilizer E.
In the coating process, the nano prepolymer A in the coating liquid C can be rapidly crosslinked and polymerized within 1min at the high temperature of 60 ℃, and a nano-dispersed rapid water-absorbing swelling material is automatically formed in the membrane material and is automatically filled into a membrane shell micropore channel formed by the coating liquid B.
The filling degree can be controlled by adjusting the proportion of the prepolymer A in the coating liquid B, so that the controlled release is adjustable, and the accurate controlled release coating fertilizer E filled with the nano water-absorbing swelling additive and having a nutrient controlled release period of 50-90 days is obtained. By adjusting the adding amount of the internal addition substances, the following three different nutrient accurate release modes can be realized: (1) under the condition that the addition amount of the prepolymer A is small, the water-absorbing material can quickly absorb water and swell to block a micropore channel in a membrane shell, so that nutrients cannot quickly enter the external environment through a gap and can only be slowly conducted to the outside through molecular gaps of the swelling material, thereby playing a role in delaying the release of the nutrients, and being suitable for crops requiring stable fertilizer, such as wheat and other crops; (2) under the condition that the addition amount of the prepolymer A is large, the water absorbing material can also play a role in blocking holes in the early stage to delay the release of nutrients, but the microporous channel in the membrane shell can be enlarged along with the gradual water absorption and swelling of the water absorbing material in the later stage, so that the nutrients can quickly enter the external environment through gaps, and the aim of accelerating the release can be achieved; (3) when the addition amount of the prepolymer A is seriously excessive, the water-absorbing material quickly swells after absorbing water, and the film shell can be burst to achieve the purpose of breaking and releasing.
The granular fertilizer D is one or more of granular urea, granular potassium chloride, granular calcium superphosphate, granular monopotassium phosphate and granular potassium sulfate; the particle size range of the particles is 2-4mm.
According to the conversion of the dosage, the weight ratio of the nano-grade prepolymer A to the granular fertilizer is determined to be 0.05-1%, and the preferable weight ratio of the water-swellable nano-grade prepolymer A to the granular fertilizer is 0.15%; in the related products of microcapsule type timed release in the prior art, the film material is a nano water-absorbing swelling additive, and the proportion of the film material in the content (fertilizer and medicine) is 30-70%; the comparison shows that the dosage of the nano-grade prepolymer A of the water-absorbing material in the scheme of the application is very low, which is only 70-600 times of that of the existing product, so that the cost of the coating is greatly reduced.
The inner diameter of the body of the coating pan is 600mm, and the rotating speed is 20rpm; the granular fertilizer is preheated by adopting a hot air heating mode, and the hot air speed is 1000m 3 H, the hot air temperature is 60 ℃; the spraying speed of the liquid raw material of the controlled release membrane material is 5g/min, and the spraying temperature is 60 ℃.
To sum up, the inventor of the present application fills the nanoscale water-absorbing swelling additive into the film material of the controlled release fertilizer, so as to achieve the coated controlled release fertilizer with precise controlled release effect, which is different from the related patents in the background art: (1) The nano water-absorbing swelling type additive has different adding positions: the method is characterized in that a nanoscale water-absorbing swelling additive is added into a membrane shell, and the action position is the membrane shell; (2) different coating processes: in order to facilitate coating, the patent firstly adds the nano-scale water-absorbing swelling type additive prepolymer into a liquid coating raw material, and achieves nano-scale dispersion through emulsification and shearing processes; then in the process of coating, the prepolymer can be quickly cross-linked and polymerized within 1min, and a nano-scale dispersed quick water-absorbing swelling material is automatically formed in the membrane material and is automatically filled into a micropore channel of the membrane shell. (3) the mechanism of action is different: because a plurality of micropore channels exist in the bio-based membrane material, if the water-absorbing swelling material is not added, the membrane material can easily enter the membrane through the gaps in the membrane shell through the capillary action, nutrients can also enter the outside of the membrane through the gaps in the membrane shell, and the fertilizer nutrients can be quickly released in a short time. When the water-absorbing swelling material is added, the nutrient release rate can be adjusted by adjusting the adding amount, so that the nutrient release can be accurately controlled.
Compared with the prior art, the accurate controlled release fertilizer finally obtained by the application has the advantages that: (1) After moisture enters the membrane shell, the water absorbing material absorbs water and swells to block micropores of the membrane shell, so that the early stage is well delayed in releasing nutrients, and the middle and later stages rely on a conduction effect to achieve the purpose of accurate controlled release and meet the requirements of plant growth. The nutrient release rate of the controlled release fertilizer is accurately regulated and controlled by regulating and controlling the addition amount of the nano-scale water-absorbing microcapsules; (2) water absorption and retention functions: the product still has the functions of water absorption and retention even after the nutrients are released, can coordinate the release of the nutrients and avoid the influence of drought environment; (3) The addition amount of the water-absorbing swelling material is very small, and only accounts for 0.05-1% of the mass of the fertilizer particles, so that the product cost is very low; (4) The process is easy to operate, and the product can be prepared by one-step reaction.
Therefore, the accurate controlled release fertilizer filled with the nanoscale water-absorbing swelling type additive developed by the patent can achieve the aim of timely and accurately releasing the controlled release fertilizer, can release 100% of nutrients in a controlled release fertilizer film shell, increases the final release rate of the nutrients of the controlled release fertilizer, and greatly improves the utilization rate of the fertilizer.
Drawings
Fig. 1 is a schematic structural diagram of the urea controlled-release coated fertilizer prepared in example 1, wherein an outer layer is a film shell, and black dots are prepolymer a.
FIG. 2 is a graph showing the results of the release rate test of the controlled release coated fertilizer obtained in examples 1-3 in a hydrostatic culture at 25 ℃.
Detailed Description
For better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples. In the following examples and experimental examples, various raw materials and fertilizers were commercially available unless otherwise specified.
Example 1:
an accurate controlled release membrane material comprises raw materials of a nano-grade prepolymer A and a coating liquid B, wherein the prepolymer A is selected from starch grafted acrylate; the polyol is polyether polyol; the isocyanate is diphenylmethane diisocyanate, and polyether polyol and isocyanate are uniformly mixed according to the mass ratio of 1; the specific weight ratio of the nano-grade prepolymer A to the coating liquid B is 1%;
first, prepolymer A was prepared as nanoscale prepolymer A:
adding 2g of the raw material prepolymer A into a 500mL three-neck round-bottom flask, then adding 10mL of chloroform, homogenizing and dispersing for 10min by a dispersion machine at room temperature and a rotating speed of 2000r/min, and then freeze-drying to obtain nano-grade prepolymer A powder; the product is detected by a scanning electron microscope to reach the nanometer level, and the particle size distribution is 1-10nm.
The preparation method of the precise controlled-release membrane material comprises the following steps:
at room temperature, adding the nano-grade prepolymer A into the coating liquid B according to the mass ratio of 1%, then adding emulsifier sorbitan monooleate (accounting for 0.05% of the weight ratio of the coating liquid B), and stirring for 2min by magnetic force at the rotating speed of 600r/min, so that the nano-grade prepolymer A is fully emulsified and dispersed in the coating liquid B, and obtaining a uniformly blended controlled-release coating liquid C, namely the precise controlled-release coating material; the product is detected by a scanning electron microscope, and the nano-grade prepolymer A achieves nano-grade dispersion in the film material.
A preparation method of a controlled release coated fertilizer comprises the following specific steps:
adding granular fertilizer D urea with the particle size range of 2-4mm into a continuously rotating coating pan, preheating the granular fertilizer to 60 ℃, uniformly spraying a coating liquid C on the surface of the preheated granular fertilizer D at the pressure of 0.3MPa according to the proportion of 5 percent of the total weight of the fertilizer, and forming a layer of uniformly distributed solid controlled-release film shell on the surface of the granular fertilizer after the liquid controlled-release film material is cured; thereby obtaining the accurate controlled-release coated fertilizer E. The release rate of the nutrient is tested by hydrostatic culture at 25 ℃, and the nutrient controlled-release period is 59.48 days (shown in figure 2).
The inner diameter of the pan body of the coating pan is 600mm, and the rotating speed is 20rpm; the granular fertilizer is preheated by adopting a hot air heating mode, and the hot air speed is 1000m 3 H, the hot air temperature is 60 ℃; the spraying speed of the liquid raw material of the controlled release membrane material is 5g/min, and the spraying temperature is 60 ℃.
Experimental example 1 application of example 1 to obtain accurate controlled release coated fertilizer E
The rice to be transplanted is used as a test specimen, 2020.06-2020.10 of a precise controlled release coated urea pond test is carried out in Linyi City of Shandong province, and the average yield of the previous five years is 8.1 multiplied by 10 3 kg/ha; the area of the single block test cell is 20m 2 The following experimental examples and comparative examples are all tested by using three test cells, and the final data are obtained by averaging;
the specific process comprises the following steps: the fertilizer to be tested is used as a base fertilizer to be scattered into a test field at one time, then the fertilizer to be tested is ploughed into the soil with the depth of 10cm, then the rice is transplanted manually, the plant spacing of the rice to be transplanted is 12.5cm, the row spacing is 25cm, the nitrogen application amount is 320kg/ha (pure), the phosphate fertilizer is diammonium phosphate, and the phosphorus application amount is 150kg/ha (pure); the potash fertilizer is potassium sulfate with potassium application amount of 150 kg/ha. The management measures of rotary tillage, irrigation, deinsectization, weeding, harvesting and the like in the growth period of the rice transplanted by rice are the same as the conventional management measures of farmers.
The nitrogen materials to be tested are: according to the weight ratio, the accurate controlled-release coated fertilizer E prepared in the example 1 accounts for 40%, and the quick-acting urea accounts for 60%. The quick-acting urea in the fertilizer can provide N element required by the early growth of the rice transplanted with rice; the precisely controlled release coated urea in the tested fertilizer can provide N element required by the late growth of the rice transplanted by rice.
Through detection, the yield of the rice seeds transplanted under the treatment is as follows: 9.15X 10 3 kg/ha, total yield: 31125.88 yuan/ha, net benefit: 13149.49 yuan/ha, and increased income 3728.63 yuan/ha (shown in Table 1);
comparative example 1-1: all nitrogen test materials were the precise controlled release coating prepared in example 1Fertilizer E; other factors were consistent with the example 1 treatment. The yield of rice seeds of the rice transplanted by the rice transplanting method is as follows: 8.77X 10 3 kg/ha, total yield: 29818.00 yuan/ha, net benefit: 11628.70 yuan/ha, and increasing the income 2207.83 yuan/ha (shown in table 1);
comparative examples 1 to 2: the commercial common coated controlled release urea (blue film controlled release fertilizer produced by Shandong agriculture and big fertilizer industry Co., ltd.) accounts for 40% by weight, and the quick-acting urea accounts for 60% by weight; other factors were kept consistent with the example 1 treatment. The yield of rice seeds for transplanting rice is as follows: 9.09X 10 3 kg/ha, total yield: 30917.32 yuan/ha, net benefit: 12941.31 Yuan/ha, and increasing income 3520.45 Yuan/ha (shown in Table 1);
comparative examples 1 to 3: the quick-acting urea accounts for 100 percent by weight (the quick-acting urea is applied for 2 times in total by base fertilizer and additional fertilizer, wherein the base fertilizer accounts for 60 percent, the additional fertilizer accounts for 40 percent, and the PK fertilizer is applied as the base fertilizer for one time); other factors were kept consistent with the example 1 treatment. The yield of rice seeds of the rice transplanted by the rice transplanting method is as follows: 8.16X 10 3 kg/ha, total yield: 27744.00 yuan/ha, net benefit: 9420.86 yuan/ha (shown in Table 1);
in comparison with comparative examples 1-1, 1-2 and 1-3, the yield of rice seedlings with the precise controlled-release coated fertilizer E obtained in example 1 is the maximum (9.15X 10) 3 kg/ha), the total yield is: 31125.88 yuan/ha, maximum net gain (13149.49 yuan/ha), and increased income 3728.63 yuan/ha.
Example 2
An accurate controlled release membrane material comprises raw materials of a nano-grade prepolymer A and a coating liquid B, wherein the prepolymer A is selected from high-substitution-degree cross-linked carboxymethyl cellulose; the solvent is chloroform; the solute is polyethylene; uniformly mixing a solvent and a solute according to the mass ratio of 6; the specific weight ratio of the nano-grade prepolymer A to the coating liquid B is 3%;
first, prepolymer A was prepared as nanoscale prepolymer A:
adding 2g of the raw material prepolymer A into a 500mL three-neck round-bottom flask, then adding 10mL of chloroform, carrying out homogeneous dispersion for 10min by a dispersion machine at room temperature and at a rotating speed of 2000r/min, and then carrying out freeze drying to obtain nano-grade prepolymer A powder; the product is detected by a scanning electron microscope, and the particle size distribution is 10-20nm.
The preparation method of the precise controlled release membrane material comprises the following steps:
at room temperature, adding the nano-grade prepolymer A into the coating liquid B according to the mass ratio of 3%, then adding emulsifier sorbitan monooleate (accounting for 0.05% of the weight ratio of the coating liquid B), and stirring for 2min by magnetic force at the rotating speed of 600r/min, so that the nano-grade prepolymer A is fully emulsified and dispersed in the coating liquid B, and obtaining a uniformly blended controlled-release coating liquid C, namely the precise controlled-release coating material; the product is detected by a scanning electron microscope, and the nano-grade prepolymer A achieves nano-grade dispersion in the film material.
A preparation method of a controlled release coated fertilizer comprises the following specific steps:
adding granular urea D with the particle size range of 2-4mm into a continuously rotating coating pan, preheating the granular urea to 60 ℃, then uniformly spraying a coating liquid C on the surface of the preheated granular urea D at the pressure of 0.3MPa according to the proportion of 5 percent of the total weight of the fertilizer, and forming a layer of uniformly distributed solid controlled-release film shell on the surface of the granular urea after the liquid controlled-release film material is cured; thereby obtaining the accurate controlled release coated urea E. The release rate of the nutrient in the static water culture at 25 ℃ is tested, and the nutrient controlled-release period is 80.51 days (shown in figure 2).
The inner diameter of the pan body of the coating pan is 600mm, and the rotating speed is 20rpm; the granular fertilizer is preheated by adopting a hot air heating mode, and the hot air speed is 1000m 3 H, the hot air temperature is 60 ℃; the spraying speed of the liquid raw material of the controlled release membrane material is 5g/min, and the spraying temperature is 60 ℃.
Experimental example 2 application of example 2 in obtaining accurate controlled release coated fertilizer E
The rice to be transplanted is used as a test specimen, 2020.06-2020.10 of a precise controlled release coated urea pond test is carried out in Linyi City of Shandong province, and the average yield of the previous five years is 8.1 multiplied by 10 3 kg/ha; the area of the single block test cell is 20m 2 The following experimental examples and comparative examples are all tested by using three test cells, and the final data are obtained by averaging;
the specific process is as follows: the fertilizer to be tested is used as a base fertilizer to be scattered into a test field at one time, then the fertilizer to be tested is ploughed into the soil with the depth of 10cm, then the rice is transplanted manually, the plant spacing of the rice to be transplanted is 12.5cm, the row spacing is 25cm, and the nitrogen application amount is 320kg/ha (pure); diammonium phosphate is selected as phosphate fertilizer, and the nitrogen application amount is 150kg/ha (pure); the potash fertilizer is potassium sulfate with potassium application amount of 150 kg/ha. The management measures of rotary tillage, irrigation, deinsectization, weeding, harvesting and the like in the growth period of the rice transplanted by rice are the same as the conventional management measures of farmers.
The nitrogen materials to be tested were: according to the weight ratio, the accurate controlled release coated urea E prepared in the example 2 accounts for 40%, and the quick-acting calcium superphosphate accounts for 60%. The quick-acting urea in the fertilizer can provide N element required by the early growth of the rice transplanted with rice; the precisely controlled release coated urea in the tested fertilizer can provide N element required by the late growth of the rice transplanted by rice.
Through detection, the rice transplanting grain yield under the treatment is as follows: 11.36X 10 3 kg/ha, total yield: 38613.80 yuan/ha, net benefit: 20636.66 yuan/ha, and increased income 11215.80 yuan/ha (shown in Table 1);
comparative example 2-1: the test nitrogen materials all adopt the precise controlled release coated urea E prepared in the example 2; other factors were consistent with the example 1 treatment. The yield of rice seeds for transplanting rice is as follows: 10.65X 10 3 kg/ha, total yield: 36223.60 yuan/ha, net gain: 18032.42 yuan/ha, increase income 8611.55 yuan/ha (shown in Table 1);
the rice transplanting seeds of the accurate controlled release coated urea E obtained in the comparative examples 2-1, 1-2 and 1-3 and the example 2 have the maximum yield (11.36 multiplied by 10) 3 kg/ha), the total yield is: 38613.80 yuan/ha, maximum net income (20636.66 yuan/ha) and increased income 11215.80 yuan/ha.
Example 3
An accurate controlled release membrane material comprises raw materials of a nano-grade prepolymer A and a coating liquid B, wherein the prepolymer A is selected from crosslinked carboxymethyl lignosulphonate magnesium grafted acrylamide; the solvent is chloroform; the solute is polylactic acid; uniformly mixing a solvent and a solute according to the mass ratio of 6; the specific weight ratio of the nano-grade prepolymer A to the coating liquid B is 7%;
firstly, preparing a prepolymer A into a nano-grade prepolymer A:
adding 2g of the raw material prepolymer A into a 500mL three-neck round-bottom flask, adding 10mL of chloroform, homogenizing and dispersing for 10min by a dispersion machine at room temperature and a rotating speed of 2000r/min, and freeze-drying to obtain nano-grade prepolymer A powder; the product is detected by a scanning electron microscope to reach the nano level, and the particle size distribution is 90-100nm.
The preparation method of the precise controlled release membrane material comprises the following steps:
at room temperature, adding the nano-grade prepolymer A into the coating liquid B according to the mass ratio of 7%, then adding emulsifier sorbitan monooleate (accounting for 0.05% of the weight ratio of the coating liquid B), and stirring for 2min by magnetic force at the rotating speed of 600r/min to fully emulsify and disperse the nano-grade prepolymer A in the coating liquid B to obtain a uniformly blended controlled-release coating liquid C, namely the precise controlled-release coating material; the product is detected by a scanning electron microscope, and the nano-grade prepolymer A achieves nano-grade dispersion in the film material.
A preparation method of a controlled release coated fertilizer comprises the following specific steps:
adding granular urea D with the particle size range of 2-4mm into a continuously rotating coating pot, preheating the granular urea to 60 ℃, uniformly spraying a coating liquid C on the surface of the preheated granular urea D at the pressure of 0.3MPa according to the proportion of 5 percent of the total weight of the fertilizer, and forming a layer of uniformly distributed solid controlled-release film shell on the surface of the granular urea after the liquid controlled-release film material is solidified; thereby obtaining the accurate controlled release coated urea E. The release rate of the nutrient is tested by hydrostatic culture at 25 ℃, and the nutrient controlled-release period is 87.52 days (as shown in figure 2).
The inner diameter of the pan body of the coating pan is 600mm, and the rotating speed is 20rpm; the granular urea is preheated by adopting a hot air heating mode, and the hot air speed is 1000m 3 H, the hot air temperature is 60 ℃; the spraying speed of the liquid raw material of the controlled release membrane material is 5g/min, and the spraying temperature is 60 ℃.
Experimental example 3 application of example 3 in obtaining accurate controlled release coated fertilizer E
The rice to be transplanted is used as a test specimen, 2020.06-2020.10 of a precise controlled release coated urea pond test is carried out in Linyi City of Shandong province, and the average yield of the previous five years is 8.1 multiplied by 10 3 kg/ha; the area of the single block test cell is 20m 2 In the following experimental examples and comparative examples, three test cells are used for testing, and the final data are obtained by averaging;
the specific process is as follows: the fertilizer to be tested is used as a base fertilizer to be scattered into a test field at one time, then the fertilizer to be tested is ploughed into the soil with the depth of 10cm, then the rice is transplanted manually, the plant spacing of the rice to be transplanted is 12.5cm, the row spacing is 25cm, the nitrogen application amount is 320kg/ha (pure), the phosphate fertilizer is diammonium phosphate, and the phosphorus application amount is 150kg/ha (pure); the potash fertilizer is potassium sulfate with potassium application amount of 150 kg/ha. The management measures of rotary tillage, irrigation, deinsectization, weeding, harvesting and the like in the growth period of the rice transplanted by rice are the same as the conventional management measures of farmers.
The nitrogen materials to be tested are: according to the weight ratio, the accurate controlled release coated urea E prepared in the example 3 accounts for 40%, and the quick-acting urea accounts for 60%. The quick-acting urea in the fertilizer can provide N element required by the early growth of the rice transplanted by rice transplanting; the precisely controlled release coated urea in the tested fertilizer can provide N element required by the late growth of the rice transplanted by rice.
Through detection, the rice transplanting grain yield under the treatment is as follows: 10.00X 10 3 kg/ha, total profit: 34011.32 yuan/ha with the net gain: 16032.68 yuan/ha (shown in table 1), and increased income 6611.82 yuan/ha;
comparative example 3-1: the test nitrogen materials all adopt the precise controlled release coated urea E prepared in the embodiment 3; other factors were consistent with the example 1 treatment. The yield of rice seeds for transplanting rice is as follows: 9.25X 10 3 kg/ha, total yield: 31463.60 yuan/ha, net benefit: 13268.65 yuan/ha (shown in table 1), increase in income 3847.79 yuan/h a;
the rice transplanting seeds of the accurate controlled release coated urea E obtained in the comparative examples 3-1, 1-2 and 1-3 and the example 2 have the maximum yield (10.00 multiplied by 10) 3 kg/ha), the total yield is: 34011.32 yuan/ha, maximum net income (16032.68 yuan/ha), and increased income 6611.82 yuan/ha.
TABLE 1
Note: the calculations in the table above are as follows: the purchase price of the rice is 3.4 yuan/kg, and other expenses comprise: seed cost (45 yuan/mu), seedling transplanting cost (250 yuan/mu), pesticide cost (120 yuan/mu), water cost (90 yuan/mu), mechanical farming cost (90 yuan/mu), and harvesting and transportation cost (60 +30 yuan/mu); manual expenditure: 1 time of base fertilizer and 2 times of topdressing (20 yuan/mu/time), 60 yuan/mu and 100 yuan/mu), and the cost is not calculated according to the actual expenditure.
The above example is one of the best modes of carrying out the invention, and all changes and substitutions that one of ordinary skill in the art would make within the scope of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An accurate controlled release membrane material, which is characterized in that: the raw materials comprise a nano-grade prepolymer A and a coating liquid B, wherein the nano-grade prepolymer A accounts for 1-20% of the coating liquid B by weight;
the prepolymer A is selected from one or more of starch grafted acrylate, high-substitution-degree crosslinked carboxymethyl cellulose, crosslinked carboxymethyl lignosulfonate-grafted acrylamide and crosslinked hydroxyethyl lignosulfonate-grafted acrylamide polymers; the particle size distribution is 1-100 nm;
the coating liquid B is selected from one or more of polyether polyol and isocyanate blend, chloroform solvent-dissolved polyethylene solution, chloroform solvent-dissolved polylactic acid solution and water solvent-dissolved polyvinyl alcohol solution.
2. The precise controlled-release membrane material according to claim 1, wherein:
the process for preparing the prepolymer A into the nano-grade prepolymer A comprises the following steps:
adding the raw material prepolymer A into a 500mL three-neck round-bottom flask, taking chloroform as a solvent, homogenizing and dispersing for 10min by a dispersion machine at room temperature and a rotating speed of 2000r/min, and then freeze-drying to obtain nano-grade prepolymer A powder;
wherein the dosage ratio of the prepolymer A to the chloroform is 1.
3. The precise controlled-release membrane material according to claim 1, wherein:
the particle size distribution of the nano-grade prepolymer A is 10-20 nanometers, and the prepolymer A is selected from high-substitution-degree cross-linked carboxymethyl cellulose; the coating liquid B is a polyethylene solution dissolved in a chloroform solvent, and the mass of the solvent is as follows: the mass of the solute is 6; the prepolymer A accounts for 3 percent of the weight of the coating liquid B.
4. The preparation method of the precise controlled-release membrane material of claim 1 is characterized by comprising the following specific steps: and at room temperature, adding the nano-grade prepolymer A into the coating liquid B according to the mass ratio of 1-20%, then adding an emulsifier, and stirring for 2min by magnetic force at the rotating speed of 600r/min, so that the nano-grade prepolymer A is fully emulsified and dispersed in the coating liquid B to obtain a uniformly blended controlled-release membrane material coating liquid C, namely the precise controlled-release membrane material.
5. The method for preparing a controlled release membrane according to claim 1,
the emulsifier is sorbitan monooleate, and the dosage of the emulsifier is 0.05 percent of the weight ratio of the envelope liquid B.
6. The method for preparing the controlled-release coated fertilizer by applying the precise controlled-release film material of claim 1 is characterized by comprising the following specific steps of:
adding the granular fertilizer D into a coating pot which continuously rotates, preheating the granular fertilizer to 60 ℃, uniformly spraying a coating liquid C on the surface of the preheated granular fertilizer D at the pressure of 0.3MPa according to the proportion of 5 percent of the total weight of the fertilizer, and forming a layer of uniformly distributed solid controlled-release membrane shell on the surface of the granular fertilizer after the liquid controlled-release membrane material is solidified; thereby obtaining the accurate controlled release coated fertilizer E.
7. The method for preparing a controlled release coated fertilizer according to claim 6,
the granular fertilizer D is one or more of granular urea, granular potassium chloride, granular calcium superphosphate, granular monopotassium phosphate and granular potassium sulfate; the particle size range of the particles is 2-4mm.
8. The method for preparing the controlled-release coated fertilizer as claimed in claim 6, wherein the inner diameter of the body of the coating pan is 600mm, and the rotating speed is 20rpm; the granular fertilizer is preheated by adopting a hot air heating mode, and the hot air speed is 1000m 3 H, the hot air temperature is 60 ℃; the spraying speed of the liquid raw material of the controlled release membrane material is 5g/min, and the spraying temperature is 60 ℃.
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