CN105859398A - Biomass-based polymer coated controlled release fertilizer and production method thereof - Google Patents
Biomass-based polymer coated controlled release fertilizer and production method thereof Download PDFInfo
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- CN105859398A CN105859398A CN201610196529.4A CN201610196529A CN105859398A CN 105859398 A CN105859398 A CN 105859398A CN 201610196529 A CN201610196529 A CN 201610196529A CN 105859398 A CN105859398 A CN 105859398A
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- controlled release
- release fertilizer
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
Abstract
The invention discloses a biomass-based polymer coated controlled release fertilizer and a production method thereof. The production method of the biomass-based polymer coated controlled release fertilizer comprises the steps of 1) uniformly mixing up straw powders, starch, a liquefying agent and an acid catalyst, subjecting an obtained mixture to co-liquefaction reaction, cooling an obtained product after the completion of the reaction, collecting a supernatant, namely a co-liquefaction liquid; 2) uniformly mixing up the co-liquefaction liquid with polyether polyol, a basic catalyst and an auxiliary agent, and subjecting an obtained mixture to reaction to obtain a co-liquefaction coating liquid; 3) simultaneously spraying the co-liquefaction coating liquid and a curing agent onto a pre-heated fertilizer particle surface to form a film. In this way, the coated controlled release fertilizer is obtained. The nutrient release longevity of the coated controlled release fertilizer is 1 to 12 months. According to the technical scheme of the invention, the product obtained through the co-liquefaction reaction of easily liquefied powders and straws is adopted as one raw material of the coating material. In this way, not only the production cost is lowered, but also the difficult degradation problem of the film layer of the coated controlled-release fertilizer is also solved.
Description
Technical field
The invention belongs to fertilizer field, relate to a kind of biomass-based polymer coating controlled release fertilizer and production method thereof.
Background technology
Coating controlled-release fertilizer refers to the nutritional need feature according to plant different growth phases, the release speed of regulation nutrient
Rate and supply intensity so that it is nutrients release pattern inhales fertile Tong Bu new-type fertilizer with crop, not only increases the profit of fertilizer
By rate, and decrease chemical fertilizer pollution on the environment.
At present, according to the difference of preparation technology, coating controlled-release fertilizer is broadly divided into organic solvent type, water type and reaction in-situ
Film-forming type three kinds.The concrete preparation process of reaction in-situ film-forming type is reacted for directly monomer being sprayed to fertilizer surface
Film forming, has that equipment is simple, produces quickly and the feature such as energy consumption is low.But, monomer used is mainly from oil
Organic Chemicals, its high price and the most exhausted petroleum resources are difficult to build the benign cycle of Controlled Release Fertilizer development.For
Break away from the dependence to petroleum resources, realize peplos biodegradation in soil simultaneously, develop based on biomass can
The coated release-controlled material of degradation polymer is the effective way preparing low cost green and protecting environmental fertilizer.
Fibre rich class material in agricultural crop straw, direct liquefaction is a kind of effective means being translated into liquid.?
Team of militia disclose in patent CN201210261735.0 by after agricultural crop straw direct liquefaction without any pretreatment
Directly spray to direct reaction film-forming on fertiliser granulates simultaneously obtain straw film-coated controlled release fertilizer with firming agent.In order to
Ensureing the performance of fertilizer, liquefier large usage quantity in liquefaction of corn straw technique, there is condensation tendency in liquefaction products simultaneously, this
The biomass components content of sample liquefaction products is the highest.Therefore, degradable peplos based on cheap Renewable resource
Controlled Release Fertilizer is still during current agricultural produces increasingly exigence.
Summary of the invention
In order to solve problems of the prior art, the present invention is from straw and starch co grinding method product, it is provided that
A kind of biomass-based polymer coating controlled release fertilizer and production method thereof.
The method preparing film-coated controlled release fertilizer that the present invention provides, comprises the steps:
1) carry out co grinding method reaction after stalk powder, starch, liquefier and acidic catalyst being mixed, react complete
Rear cooling, collects supernatant, is co grinding method thing；
2) by step 1) mixing of gained co grinding method thing and polyether polyol, base catalyst and auxiliary agent reacts,
To co grinding method coating liquid；
3) by step 2) gained co grinding method coating liquid and firming agent spray to the fertiliser granulates surface filming of preheating simultaneously,
Obtain described film-coated controlled release fertilizer.
The flow process of said method is as shown in Figure 1.
The step 1 of said method) in, described stalk powder is corn straw, corn cob, rice straw, wheat straw
The powder of at least one in stalk, Pericarppium arachidis hypogaeae and cotton stalk；
The particle diameter of described stalk powder is 20～80 mesh, specially 20,40,60 or 80 mesh；
At least one in corn starch and potato starch of described starch；
At least one in Polyethylene Glycol, ethylene glycol, ethylene carbonate, glycerol and diethylene glycol of described liquefier；
Wherein, the relative molecular mass of described Polyethylene Glycol is 200～600, specially 200,400 or 600；
At least one in hydrochloric acid, sulphuric acid and phosphoric acid of described acidic catalyst.Described sulphuric acid is specially concentrated sulphuric acid,
More specifically mass percentage concentration is the concentrated sulphuric acid of 98%；The mass percentage concentration of described hydrochloric acid concretely 37%；Institute
State the mass percentage concentration of phosphoric acid concretely 85%；
Described step 1) in, the mass ratio of stalk powder, starch, liquefier and acidic catalyst be 25～65:10～
22:100:2～6, concretely 25:12:100:2,40:10:100:4,35:11.8:100:3,65:20:100:6；
In described co grinding method reactions steps, temperature is 140～180 DEG C, concretely 140 DEG C, 160 DEG C, 170 DEG C or
180℃；Time is 40～120min, concretely 40min, 90min, 100min or 120min；
Described being cooled in ice-water bath or cold water cools down.
Described step 2) in, the hydroxyl value of polyether polyol is 50～800, specially 250,470 or 500；More
Body, described polyether polyol can be purchased from Plant of Tianjin Petrochemical Company, the trade mark is TAE-470, hydroxyl value is the polyether polyols of 470
Alcohol or be purchased from the Zhong Mountain, Jiangsu chemical industry, the trade mark is N635S, hydroxyl value be 500 polyether polyol or be purchased from Mitsui Chemicals,
The trade mark is G-250, hydroxyl value is the polyether polyol of 250；
Described base catalyst is by the mixture formed of aminated compounds Yu pink salt；Wherein, described aminated compounds
Be chosen in particular from triethylene diamine, ethylenediamine, triethylenediamine, triethylamine, triethanolamine, dimethyl cyclohexyl amine,
At least one in dimethyl cetylamine, dimethylethanolamine and tetramethyl imino group dipropylamine；
Described pink salt is chosen in particular from dibutyl tin laurate, two mercaptan dialkyl tins, dibutyltin diacetate, octanoic acid
At least one in stannous, Mono-n-butyltin and Dibutyltin oxide；
The mass ratio of described aminated compounds and pink salt is specially 1～3:1, more specifically 1:1,1.12:1,1.38:
1 or 3:1；
Described auxiliary agent selected from paraffin, microwax, chlorinated paraffin, Petropols, alpha-olefin, Tissuemat E, EVA wax,
At least one in Colophonium and silicon wax；Wherein, described paraffin concretely fusing point is the paraffin of 60 DEG C；
The mass ratio of described co grinding method thing, polyether polyol, base catalyst and auxiliary agent is 100:10～100:1～5:
3～15, specially 100:23.8:2.48:5,100:82.6:2.5:3.1,100:10:1:10,100:45:
5:15；
Described step 2) in reactions steps, temperature is 65～100 DEG C, concretely 80 DEG C, 95 DEG C or 100 DEG C；Time
Between be 10～30min, concretely 10min, 20min or 30min.
Described step 3) in, described firming agent selected from poly methylene poly phenyl poly isocyanate, toluene di-isocyanate(TDI),
Hexamethylene diisocyanate, methyl diphenylene diisocyanate (MDI), liquefied mdi, isophorone two isocyanide
Acid esters, hexamethylene diisocyanate (HDI), the trimer of HDI, trimethyl hexamethylene diisocyanate, benzene two
At least one in methylene diisocyanate and dimethyl diphenyl diisocyanate；
The mass ratio of described co grinding method coating liquid and firming agent is 1:0.9～2, specially 1:1,1:1.3,1:1.6,
1:2；
Described fertiliser granulates is water solublity straight fertilizer or is mixed by least two in described water solublity straight fertilizer
The compound fertilizer arrived；
Wherein, described water solublity straight fertilizer is selected from carbamide, ammonium sulfate, ammonium chloride, ammonium nitrate, MAP, phosphorus
In acid diammonium, potassium chloride, potassium sulfate, potassium nitrate, magnesium sulfate, magnesium nitrate, zinc sulfate, copper sulfate and zinc chloride
At least one, concretely urea granules；Described it is mixed to get by least two in described water solublity straight fertilizer
Concretely Sa Kefu compound fertilizer of compound fertilizer, can be more specifically the Sa Ke that mass ratio is 15:15:15 of n-p-k element
Rich compound fertilizer, wherein, in this Sa Kefu compound fertilizer, the quality of nitrogen element is in terms of nitrogen, and the quality of P elements is with five oxidations
Two phosphorus, the quality of potassium element is in terms of potassium oxide；
The particle diameter of described fertiliser granulates is 2～5mm, specially 2～4mm；
In described preheating step, temperature is 75～95 DEG C.
Described method may also include that step 1) cooling after residue obtained proceed be catalyzed co grinding method reaction.
It addition, the film-coated controlled release fertilizer prepared according to the method described above and this film-coated controlled release fertilizer are in Crops in Applying Fertilizer
Application, fall within protection scope of the present invention.
Wherein, the fertilizer releasing period of described film-coated controlled release fertilizer is 1～12 months, concretely 60 days, 80 days,
100 days or 180 days or 60-180 days.
The peplos rate of described film-coated controlled release fertilizer is 3-10%, concretely 5%, 7% or 10%；Film layer is through 1
After year degraded, weight-loss ratio is 8-20%, concretely 8%, 10%, 12%, 15%.
The invention have the characteristics that:
1, the product obtained using liquescent starch and straw co grinding method is as one of peplos raw material, not only solves discarded
The problem that thing straw secondary utilizes, and solve the difficult degradation problem of film-coated controlled release fertilizer film layer；
2, the controlled release properties that the biomass-based polymer coated controlled release of gained is fertile is good, can meet the growth need of different crops
Ask.
Accompanying drawing explanation
The preparation flow figure of the coating controlled-release fertilizer that Fig. 1 provides for the present invention.
In figure, labelling is as follows:
1, put into reactor after stalk powder, starch, liquefier and acidic catalyst being measured and carry out co grinding method reaction,
Reaction terminates postprecipitation cooling and obtains co grinding method supernatant, and residue stays and proceeds co grinding method in co grinding method system；2, will
After the metering of co grinding method supernatant, base catalyst, polyether polyol, auxiliary agent, constant temperature stirs into and all has liquid altogether in a reservoir
Change coating liquid；3, firming agent is preheated；4, fertiliser granulates is added in seed-coating machine and preheat；5, co grinding method coating liquid and
Firming agent is sprayed on fertiliser granulates surface simultaneously and carries out reaction in-situ film forming；6, the coated fertilizer packaging that will have cooled down.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further elaborated, but the present invention is not limited to following example.Institute
Method of stating is conventional method if no special instructions.Described raw material the most all can obtain from open commercial sources
?.
The test of the controlled release properties of following embodiment gained coating controlled-release fertilizer uses following water-extraction method: weigh 5g peplos
Fertilizer is placed in the nylon net bag of 100 mesh, is inserted by bag in the plastic containers filled in 250mL distilled water after sealing,
After sealing, put in 25 DEG C of constant incubators, support respectively at the sampling and measuring such as 1,3,7,14,28,35,42 days
Divide dissolution data.
Fertilizer releasing period refers to that coating controlled-release fertilizer preparation in 25 DEG C of water reaches the natural law needed for 80%.
Content × 100 of this nutrient in the amount of nutrients/sample of preliminary solubility (%)=first day accumulation dissolution.
The test of film layer degradation property uses outdoor soil to bury method.Peplos is imbedded at regular intervals about 10cm under field soil
Place, allows it degrade under field conditions (factors), at set intervals, takes out peplos from soil, the most clear with deionized water
Wash, calculate weight-loss ratio after drying.
Weight-loss ratio (%)=[(weight after original weight-degraded)/original weight] × 100
Embodiment 1, co grinding method coating liquid and the preparation of Controlled Release Fertilizer thereof
1) prepare co grinding method coating liquid and Controlled Release Fertilizer thereof according to flow process as shown in Figure 1, specifically comprise the following steps that 100g
Particle diameter is the corn stalk powder of 80 mesh, 48g corn starch, is made up of 350g PEG400 and 50g glycerol
Liquefier, the concentrated sulfuric acid catalyst of 8g98%, in the reactor equipped with mechanical agitation and condensing tube after mix homogeneously,
Under being stirred continuously, it is warming up to 160 DEG C, carries out co grinding method and react 100 minutes, then terminate reaction with ice-water bath cooling,
Precipitation obtains 500g co grinding method supernatant (namely co grinding method thing), and the residue stayed in system proceeds co grinding method；
2) add in the 500g co grinding method supernatant (namely co grinding method thing) paraffin that 25g auxiliary agent fusing point is 60 DEG C,
The base catalyst being made up of 7.2g ethylenediamine and 5.2g stannous octoate and 119g polyether polyol (it is purchased from Plant of Tianjin Petrochemical Company,
The trade mark is TAE-470, and hydroxyl value is 470) at 95 DEG C continue stirring carry out reacting 10 minutes, obtain co grinding method peplos
Liquid.
3) it is that 2～4mm granular ureas are preheated to 75 DEG C in rotary drum by 2 kilograms of particle diameters, then by 36.3g liquid altogether
Change coating liquid and 36.9g firming agent poly methylene poly phenyl poly isocyanate sprays to rapidly urea granules surface simultaneously and enters
Row reaction in-situ film forming.First thermal source is taken out, more slowly cool down, prepare the biomass-based polymer that peplos rate is 5%
Coating controlled-release fertilizer.
The preliminary solubility of this coating controlled-release fertilizer is 0.9%, and the controlled release phase is 80 days.Film layer through 1 year degrade after,
Weight-loss ratio is about 12%.
Embodiment 2, co grinding method coating liquid and the preparation of Controlled Release Fertilizer thereof
1) prepare co grinding method coating liquid and Controlled Release Fertilizer thereof according to flow process as shown in Figure 1, specifically comprise the following steps that 160g
Particle diameter is the rice straw powder of 40 mesh, 40g corn starch, is made up of 320g polyethylene glycol 200 and 80g ethylene glycol
Liquefier, the concentrated sulfuric acid catalyst of 16g98%, in the reactor equipped with mechanical agitation and condensing tube after mix homogeneously,
Under being stirred continuously, it is warming up to 180 DEG C, carries out co grinding method and react 40 minutes, then terminate reaction with psychrolusia cooling,
Precipitation obtains 546g co grinding method supernatant (namely co grinding method thing), and the residue stayed in system proceeds co grinding method；
2) in 546g co grinding method supernatant (namely co grinding method thing), 16.9g auxiliary agent microwax is added, by 10.3g
Triethylene diamine and 3.5g stannous octoate composition base catalyst and 451g polyether polyol (be purchased from Plant of Tianjin Petrochemical Company,
The trade mark is TAE-470, and hydroxyl value is 470) at 80 DEG C continue stirring carry out reacting 20 minutes, obtain co grinding method peplos
Liquid.
3) it is that 2～4mm granular ureas are preheated to 95 DEG C in fluid bed by 2 kilograms of particle diameters, then by 30g altogether
Liquefaction coating liquid and 39.6g firming agent 2,4 toluene diisocyanate spray to rapidly urea granules surface simultaneously and carry out former
Position reaction film forming.First thermal source is taken out, more slowly cool down, prepare the biomass-based polymer capsule that peplos rate is 5%
Controlled Release Fertilizer.
The preliminary solubility of this coating controlled-release fertilizer is 0.5%, and the controlled release phase is 60 days.Film layer through 1 year degrade after,
Weight-loss ratio is about 10%.
Embodiment 3, co grinding method coating liquid and the preparation of Controlled Release Fertilizer thereof
1) prepare co grinding method coating liquid and Controlled Release Fertilizer thereof according to flow process as shown in Figure 1, specifically comprise the following steps that 140g
Particle diameter is the Pericarppium arachidis hypogaeae powder of 60 mesh, 47g corn starch, is made up of 327g Macrogol 600 and 73g diethylene glycol
Liquefier, the concentrated sulfuric acid catalyst of 12g98%, in the reactor equipped with mechanical agitation and condensing tube after mix homogeneously,
Under being stirred continuously, it is warming up to 140 DEG C, carries out co grinding method and react 120 minutes, then terminate reaction with ice-water bath cooling,
Precipitation obtains 530g co grinding method supernatant (namely co grinding method thing), and the residue stayed in system proceeds co grinding method；
2) in 530g co grinding method supernatant (namely co grinding method thing), 53g auxiliary agent EVA wax is added, by 2.8g tri-
Ethamine and the catalyst of 2.5g dibutyl tin laurate composition and 53g polyether polyol (are purchased from Mitsui Chemicals, the trade mark
For G-250, hydroxyl value is 250) at 100 DEG C continue stirring carry out reacting 10 minutes, obtain co grinding method coating liquid.
3) 2 kilograms a diameter of 2～4mm granular urea are loaded in rotary drum, be heated to 85 DEG C, then by 36.3g
Liquefaction of corn straw coating liquid and 57.8g firming agent poly methylene poly phenyl poly isocyanate spray to rapidly urea granules simultaneously
Surface carries out reaction in-situ film forming.First being taken out by thermal source, more slowly cool down, preparing peplos rate is the liquefaction of corn straw of 7%
Coating controlled-release fertilizer.
The preliminary solubility of this coating controlled-release fertilizer is 1.3%, and the controlled release phase is 100 days.Film layer through 1 year degrade after,
Weight-loss ratio is about 15%.
Embodiment 4, co grinding method coating liquid and the preparation of Controlled Release Fertilizer thereof
1) prepare co grinding method coating liquid and Controlled Release Fertilizer thereof according to flow process as shown in Figure 1, specifically comprise the following steps that
It is the corncob powder of 20 mesh, 80g corn starch, 400g ethylene carbonate liquefier, 24g by 260g particle diameter
Phosphoric acid catalyst, in the reactor equipped with mechanical agitation and condensing tube after mix homogeneously, is warming up under being stirred continuously
170 DEG C, carrying out co grinding method and react 90 minutes, then terminate reaction with psychrolusia cooling, precipitation obtains 666g co grinding method
Supernatant (namely co grinding method thing), the residue stayed in system proceeds co grinding method；
2) in 666g co grinding method supernatant (namely co grinding method thing), 99.9g auxiliary agent microwax is added, by 16.6g
Ethylenediamine and the catalyst of 16.6g dibutyl tin laurate composition and 300g polyether polyol (are purchased from the Zhong Mountain, Jiangsu
Work, the trade mark is N635S, and hydroxyl value is 500) at 95 DEG C, continue stirring carry out reacting 30 minutes, obtain co grinding method bag
Film liquid.
3) 2 kilograms a diameter of 2～4mm Sa Kefu compound fertilizer (N-P-K:15-15-15) are loaded in rotary drum, add
Heat is to 95 DEG C, and then by 30.8g liquefaction of corn straw coating liquid and 61.6g firming agent 2,6-toluene di-isocyanate(TDI) is the most fast
Speed sprays to compound fertilizer surface and carries out reaction in-situ film forming.First being taken out by thermal source, more slowly cool down, preparing peplos rate is
The liquefaction of corn straw coating controlled-release fertilizer of 10%.
The preliminary solubility of this coating controlled-release fertilizer is 0.1%, and the controlled release phase is 180 days.Film layer through 1 year degrade after,
Weight-loss ratio is about 8%.
Claims (10)
1. the method preparing film-coated controlled release fertilizer, comprises the steps:
1) carry out co grinding method reaction after stalk powder, starch, liquefier and acidic catalyst being mixed, react complete
Rear cooling, collects supernatant, is co grinding method thing；
2) by step 1) mixing of gained co grinding method thing and polyether polyol, base catalyst and auxiliary agent reacts,
To co grinding method coating liquid；
3) by step 2) gained co grinding method coating liquid and firming agent spray to the fertiliser granulates surface filming of preheating simultaneously,
Obtain described film-coated controlled release fertilizer.
Method the most according to claim 1, it is characterised in that: described step 1) in, described stalk powder is
The powder of at least one in corn straw, corn cob, rice straw, wheat stalk, Pericarppium arachidis hypogaeae and cotton stalk；
The particle diameter of described stalk powder is 20～80 mesh；
At least one in corn starch and potato starch of described starch；
At least one in Polyethylene Glycol, ethylene glycol, ethylene carbonate, glycerol and diethylene glycol of described liquefier；
Wherein, the relative molecular mass of described Polyethylene Glycol is 200～600；
At least one in hydrochloric acid, sulphuric acid and phosphoric acid of described acidic catalyst.
Method the most according to claim 1 and 2, it is characterised in that: described step 1) in, stalk powder,
The mass ratio of starch, liquefier and acidic catalyst is 25～65:10～22:100:2～6；
In described co grinding method reactions steps, temperature is 140～180 DEG C；Time is 40～120min；
Described being cooled in ice-water bath or cold water cools down.
4. according to described method arbitrary in claim 1-3, it is characterised in that: the hydroxyl value of described polyether polyol is
50～800；
Described base catalyst is the mixture being made up of aminated compounds and pink salt；Wherein, described aminated compounds tool
Body selected from triethylene diamine, ethylenediamine, triethylenediamine, triethylamine, triethanolamine, dimethyl cyclohexyl amine, two
At least one in methyl hexadecyl amine, dimethylethanolamine and tetramethyl imino group dipropylamine；
Described pink salt is chosen in particular from dibutyl tin laurate, two mercaptan dialkyl tins, dibutyltin diacetate, octanoic acid
At least one in stannous, Mono-n-butyltin and Dibutyltin oxide；
Described aminated compounds is specially 1～3:1 with the mass ratio of pink salt；
Described auxiliary agent selected from paraffin, microwax, chlorinated paraffin, Petropols, alpha-olefin, Tissuemat E, EVA wax,
At least one in Colophonium and silicon wax；
The mass ratio of described co grinding method thing, polyether polyol, base catalyst and auxiliary agent is 100:10～100:1～5:
3～15.
5. according to described method arbitrary in claim 1-4, it is characterised in that: described step 2) in reactions steps,
Temperature is 65～100 DEG C, and the time is 10～30min.
6. according to described method arbitrary in claim 1-5, it is characterised in that: described step 3) in, described solid
Agent is selected from poly methylene poly phenyl poly isocyanate, toluene di-isocyanate(TDI), hexamethylene diisocyanate, hexichol
Dicyclohexylmethane diisocyanate, liquefied mdi, isophorone diisocyanate, hexamethylene diisocyanate, the three of HDI
Aggressiveness, trimethyl hexamethylene diisocyanate, XDI and dimethyl diphenyl diisocyanate
In at least one；
Described co grinding method coating liquid is 1:0.9～2 with the mass ratio of firming agent；
Described fertiliser granulates is water solublity straight fertilizer or is mixed by least two in described water solublity straight fertilizer
The compound fertilizer arrived；
In described preheating step, temperature is 75～95 DEG C.
7. the film-coated controlled release fertilizer that in claim 1-6, arbitrary described method prepares.
Film-coated controlled release fertilizer the most according to claim 7, it is characterised in that: supporting of described film-coated controlled release fertilizer
The subrelease phase of putting is 1～12 months.
9. according to the film-coated controlled release fertilizer described in claim 7 or 8, it is characterised in that: described film-coated controlled release fertilizer
Peplos rate be 3-10%；Film layer is after 1 year degrades, and weight-loss ratio is 8-20%.
10. arbitrary described film-coated controlled release fertilizer application in Crops in Applying Fertilizer in claim 7-9.
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| CN106518339A (en) * | 2016-10-25 | 2017-03-22 | 北京市农林科学院 | In-situ reaction film-forming type release-controlled fertilizer and production method thereof |
| CN107082692A (en) * | 2017-05-10 | 2017-08-22 | 山东农业大学 | A kind of modified black liquid bio-based film-coated controlled release fertilizer and preparation method thereof |
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| CN110590449A (en) * | 2019-09-30 | 2019-12-20 | 北京市农林科学院 | Starch-based polymer coated controlled release fertilizer and preparation method thereof |
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| CN113416106A (en) * | 2021-06-21 | 2021-09-21 | 山东农业大学 | Preparation method of liquefied bio-based coated controlled release material |
| CN116120123A (en) * | 2022-12-14 | 2023-05-16 | 中国热带农业科学院南亚热带作物研究所 | Biomass-based membrane, coated controlled-release fertilizer and preparation method and application thereof |
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