CN109336674A - A kind of preparation method of polydactyl acid slow-release fertilizer - Google Patents
A kind of preparation method of polydactyl acid slow-release fertilizer Download PDFInfo
- Publication number
- CN109336674A CN109336674A CN201811276240.9A CN201811276240A CN109336674A CN 109336674 A CN109336674 A CN 109336674A CN 201811276240 A CN201811276240 A CN 201811276240A CN 109336674 A CN109336674 A CN 109336674A
- Authority
- CN
- China
- Prior art keywords
- fertilizer
- slow
- coating
- release fertilizer
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- 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
- C05G3/80—Soil conditioners
-
- 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
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a kind of preparation methods of polydactyl acid slow-release fertilizer, are related to slow release fertilizer technical field.The present invention is modified processing to polylactic acid, enhances its mechanical performance and filming performance, is not easily broken, easy to process, and preferable integrality is able to maintain in fluidized bed process；Using polydactyl acid as the coated fertilizer of primary raw material, performance stabilization is not easily broken, and can ensure that the slow release effect of fertilizer；The stability and water-retaining property of coated fertilizer can be improved in sorbitol ester, prevents erosion；Biological bacteria can accelerate the molding rate of coating, improve the activity of reaction, while can also improve soil, purify water, eliminate stink, inhibit corruption；The present invention produces slow-release fertilizer using fluidized bed drum coating process, and simple process is efficient, environment friendly and pollution-free.
Description
Technical field:
The present invention relates to slow release fertilizer technical fields, and in particular to a kind of preparation method of polydactyl acid slow-release fertilizer.
Background technique:
China is large agricultural country, and with agrotechnical continuous development, agricultural volume increase is more next for the degree of dependence of chemical fertilizer
Higher, the amount of application of China's chemical fertilizer occupies first place in the world at present, and increased trend year by year is presented.But traditional fertilizer is in agricultural production
Two large problems are faced in use process: first is that fertilizer amount is big, utilization rate is low, and China's this season utilization rate of fertilizer nitrogenous fertilizer is 30-
35%, phosphate fertilizer utilization efficiency 10-25%, potash fertilizer 35%-50%；Second is that chemical fertilizer application is unreasonable, the chemical fertilizer in China is applied at present
With still based on quick action fertilizer by several times application, utilization rate is low, and the fertilizer efficiency period is short, and at high cost, pollutes environment.
Cause utilization rate of fertilizer low main reasons is that fertilizer leaching loss and volatilization, a large amount of leaching losses of fertilizer not only make soil
Fertility decline, crop reduce, and cause a large amount of economic loss, but also will cause environmental pollution.Therefore, how to improve
Utilization rate of fertilizer gives full play to effect of the fertilizer to plant, is of great immediate significance to China's agricultural sustainable development.
Slow release fertilizer is a kind of new-type fertilizer, and nutrient releasing speed sum number measurer has certain controllability, can basis
Plant growth needs Releasing nutrient, keeps it permanently effective within the entire growth period of crops, can greatly improve the benefit of fertilizer
With rate, dosage and application times are reduced.
Polylactic acid (PLA) is a kind of novel biodegradation material, is mentioned using reproducible plant resources (such as corn)
Starch raw material out is made, can be degradable by microorganism in nature after use, ultimately generates carbon dioxide and water, does not pollute
Environment.But the processing performance of polylactic acid is poor, when being used as membrane material, is easy to be destroyed by external environment.
Summary of the invention:
Technical problem to be solved by the present invention lies in providing, a kind of coated fertilizer processability is good, excellent physical properties, drop
Solution rate meets the preparation method of the polydactyl acid slow-release fertilizer of plant absorption.
The following technical solution is employed for the technical problems to be solved by the invention to realize:
A kind of preparation method of polydactyl acid slow-release fertilizer, comprising the following steps:
(1) modification of polylactic acid: polylactic acid being added in the ethyl alcohol that concentration is 75%, be heated to reflux state, is kept the temperature
It stirs 10-20min, polyethylene glycol 400, hydroxypropyl methyl cellulose and catalyst is then added, return stirring 1-3h stands 5-
Then three ester of citric acid fourth is added in 10min, continue return stirring 0.5-1h, filter while hot, gained precipitating deionized water and nothing
Water-ethanol washes away impurity, is sent into 100-110 DEG C of drying box, dries to constant weight to get polydactyl acid is arrived；
(2) preparation of coated fertilizer；Industrial starch, deionized water are added into reaction kettle, is warming up to 70-80 under stiring
DEG C, gelatinization stirring 20-30min adds polydactyl acid, rilanit special, sorbitol ester, 85 DEG C -90 is warming up under stirring
DEG C, isothermal reaction time 1-2h is cooled to 40-50 DEG C, and biological bacteria is added and stirs 0.5-1h, stands 10-20min to get packet is arrived
Membrane material；
(3) preparation of slow-release fertilizer: fertilizer is poured into fluidized bed drum seed-coating machine, is preheating to 80 DEG C -90 DEG C in preheating zone,
It into fluidized coating area, is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, fluidized and be passed through in bed box body
70 DEG C -80 DEG C of preheated air, material are held up and are flowed downward by hot-air at inclined bed bottom, fall in bed lowest point,
Uniform material curtain layer is formed in dropping process；After the coated fertilizer prepared is measured by total coating rate 8-10wt%, by high pressure spray
Head is sprayed on material curtain；Particle after being coated for the first time drops down onto fluidized bed drum coating motor spindle, is promoted to fluidisation through shovelling plate again
On bed, secondary fluidized coating is carried out；Circulation through three more than ten times, the fertilizer after coating are gone out by fluidized bed drum coating drive end unit
Material, coated fertilizer multilayer uniform fold obtain slow-release fertilizer finished product in fertiliser granulates surface, screened, cooling.
The polylactic acid, polyethylene glycol 400, hydroxypropyl methyl cellulose, catalyst, three ester of citric acid fourth mass ratio be
20-30:10-20:20-30:0.1-0.5:1-5.
The molecular weight of the polylactic acid is 5000-20000, elongation at break 4-10%.
The molecular weight of the hydroxypropyl methyl cellulose is 10000-100000.
The catalyst is peroxidized t-butyl perbenzoate.
The industrial starch, deionized water, polydactyl acid, rilanit special, sorbitol ester, biological bacteria mass ratio be
30-40:60-80:20-30:1-5:1-5:1-5.
The dissolubility of each component in coated fertilizer can be improved in rilanit special, facilitates the film forming of coated fertilizer, and
It itself is easy to decompose in nature that residual will not be generated；Sorbitol ester can participate in coated fertilizer composition, while can
Enhance the stability and water-retaining property of coated fertilizer.
Biological bacteria be EM biological bacteria, be will include the multiple beneficial microorganism including aerobic bacteria and anaerobic bacteria pass through it is unique
Fermentation technique organically combines, wherein each microorganism alternate in breeding is grown altogether, formed one it is powerful
It is whole, play various effects such as " beneficial to decompose ", " anti-oxidant ".Biological bacteria can be by the raw material carry out portion in coated fertilizer
It decomposes, accelerates the dissolution molding rate of coating, improve the activity of reaction；Mainly contain in EM simultaneously with lactic acid bacteria, saccharomycete,
EM is launched in the environment, can be partially formed dominant microflora, boot environment microorganism by the beneficial microbe based on photosynthetic bacteria etc.
Group inhibits the proliferation of spoilage organisms, pathogeny bacterium to good direction activity, so that playing improves environment, improvement soil, purified water
Matter, the effect eliminated stink, inhibit corruption.
The modification theory of polylactic acid: hydroxypropyl methyl cellulose under the effect of the catalyst, occurs ring-opening reaction and adds to
In polylactic acid molecule, modified using three ester of citric acid fourth is plasticized, so that the mechanical performance of modified polylactic acid obtains significantly
It improves, has filming performance, be not easily broken, flexibility is good, easy to process, degradation rate is moderate, meets the growth rhythm of plant.
Polyethylene glycol 400 is used as catalyst aid, and the dissolubility of raw material and the activity of reaction can be improved.
The fertilizer be selected from one of nitrogenous fertilizer, potash fertilizer, phosphate fertilizer or a variety of, nitrogenous fertilizer be selected from urea, ammonium chloride, ammonium sulfate,
One of ammonium nitrate, ammonium hydrogen carbonate；Phosphate fertilizer in calcium superphosphate, double superhosphate, monoammonium phosphate, Diammonium phosphate (DAP) one
Kind；Potash fertilizer is selected from one of potassium chloride, potassium sulfate, potassium nitrate, potassium phosphate,monobasic.
The beneficial effects of the present invention are:
(1) present invention is modified processing to polylactic acid, enhances its mechanical performance and filming performance, is not easily broken, easily
In processing, preferable integrality is able to maintain in fluidized bed process；
(2) coated fertilizer prepared using polydactyl acid as primary raw material, performance stabilization are not easily broken, and can ensure that fertilizer
Slow release effect；The stability and water-retaining property of coated fertilizer can be improved in sorbitol ester, prevents erosion；Biological bacteria can be accelerated to wrap
The molding rate of film improves the activity of reaction, while can also improve soil, purify water, eliminate stink, inhibit corruption；
(3) present invention produces slow-release fertilizer using fluidized bed drum coating process, and simple process is efficient, is not related to organic molten
Agent, environment friendly and pollution-free, product film layer is wear-resisting, is not easily broken.
Specific embodiment:
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
Embodiment 1
(1) modification of polylactic acid: 25kg polylactic acid being added in the ethyl alcohol that concentration is 75%, be heated to reflux state,
Insulated and stirred 10min, 15kg polyethylene glycol 400,25kg hydroxypropyl methyl cellulose and 0.1kg perbenzoic acid is then added
The tert-butyl ester, return stirring 2h stand 10min, and three ester of 2kg citric acid fourth is then added, and continue return stirring 0.5h, while hot mistake
Filter, gained precipitating deionized water and dehydrated alcohol wash away impurity, are sent into 100-110 DEG C of drying box, it is dry to constant weight to get
To polydactyl acid；
(2) preparation of coated fertilizer；35kg industrial starch, 65kg deionized water are added into reaction kettle, rises under stiring
For temperature to 70 DEG C, gelatinization stirring 20min adds 20kg polydactyl acid, 2kg rilanit special, 2kg sorbitol ester, under stirring
85 DEG C, isothermal reaction time 2h are warming up to, is cooled to 40 DEG C, 1kg biological bacteria is added and stirs 0.5h, stands 10min to get packet is arrived
Membrane material；
(3) preparation of slow-release fertilizer: 200kg urea is poured into fluidized bed drum seed-coating machine, is preheating to 80 DEG C in preheating zone,
It into fluidized coating area, is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, fluidized and be passed through in bed box body
80 DEG C of preheated air, material are held up and are flowed downward by hot-air at inclined bed bottom, fall, fall in bed lowest point
Uniform material curtain layer is formed in journey；The coated fertilizer that 16kg is prepared is sprayed on material curtain by high-pressure nozzle；After being coated for the first time
Particle drop down onto fluidized bed drum coating motor spindle, be promoted on fluidized bed through shovelling plate again, carry out secondary fluidized coating；Through three
Circulation more than ten times, by fluidized bed drum coating drive end unit discharging, coated fertilizer multilayer uniform fold exists the urea after coating
Fertiliser granulates surface, it is screened, cooling, obtain slow-release fertilizer finished product.
Embodiment 2
(1) modification of polylactic acid: 25kg polylactic acid being added in the ethyl alcohol that concentration is 75%, be heated to reflux state,
Insulated and stirred 10min, 15kg polyethylene glycol 400,25kg hydroxypropyl methyl cellulose and 0.1kg perbenzoic acid is then added
The tert-butyl ester, return stirring 2h stand 10min, and three ester of 2kg citric acid fourth is then added, and continue return stirring 0.5h, while hot mistake
Filter, gained precipitating deionized water and dehydrated alcohol wash away impurity, are sent into 100-110 DEG C of drying box, it is dry to constant weight to get
To polydactyl acid；
(2) preparation of coated fertilizer；35kg industrial starch, 65kg deionized water are added into reaction kettle, rises under stiring
For temperature to 70 DEG C, gelatinization stirring 20min adds 20kg polydactyl acid, 2kg rilanit special, 2kg sorbitol ester, under stirring
85 DEG C, isothermal reaction time 2h are warming up to, is cooled to 40 DEG C, 1kg biological bacteria is added and stirs 0.5h, stands 10min to get packet is arrived
Membrane material；
(3) preparation of slow-release fertilizer: 200kg Diammonium phosphate (DAP) is poured into fluidized bed drum seed-coating machine, is preheating in preheating zone
It 80 DEG C, into fluidized coating area, is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, fluidize bed box body
It is inside passed through 80 DEG C of preheated air, material is held up and is flowed downward by hot-air at inclined bed bottom, it is fallen in bed lowest point,
Uniform material curtain layer is formed in dropping process；The coated fertilizer that 16kg is prepared is sprayed on material curtain by high-pressure nozzle；Through first
Particle after coating drops down onto fluidized bed drum coating motor spindle, is promoted on fluidized bed through shovelling plate again, carries out secondary fluidisation packet
Clothing；Circulation through three more than ten times, the Diammonium phosphate (DAP) after coating is by fluidized bed drum coating drive end unit discharging, coated fertilizer multilayer
Uniform fold obtains slow-release fertilizer finished product in fertiliser granulates surface, screened, cooling.
Embodiment 3
(1) modification of polylactic acid: 25kg polylactic acid being added in the ethyl alcohol that concentration is 75%, be heated to reflux state,
Insulated and stirred 10min, 15kg polyethylene glycol 400,25kg hydroxypropyl methyl cellulose and 0.1kg perbenzoic acid is then added
The tert-butyl ester, return stirring 2h stand 10min, and three ester of 2kg citric acid fourth is then added, and continue return stirring 0.5h, while hot mistake
Filter, gained precipitating deionized water and dehydrated alcohol wash away impurity, are sent into 100-110 DEG C of drying box, it is dry to constant weight to get
To polydactyl acid；
(2) preparation of coated fertilizer；35kg industrial starch, 65kg deionized water are added into reaction kettle, rises under stiring
For temperature to 70 DEG C, gelatinization stirring 20min adds 20kg polydactyl acid, 2kg rilanit special, 2kg sorbitol ester, under stirring
85 DEG C, isothermal reaction time 2h are warming up to, is cooled to 40 DEG C, 1kg biological bacteria is added and stirs 0.5h, stands 10min to get packet is arrived
Membrane material；
(3) preparation of slow-release fertilizer: will pour into fluidized bed drum seed-coating machine in 200kg potassium phosphate,monobasic, pre- in preheating zone
Heat, into fluidized coating area, is promoted at the top of rotary drum by shovelling plate to 80 DEG C, then scatters the surface of fluidized bed, fluidized bed
80 DEG C of preheated air is passed through in cabinet, material is held up and flowed downward by hot-air at inclined bed bottom, in bed lowest point
It falls, forms uniform material curtain layer in dropping process；The coated fertilizer that 16kg is prepared is sprayed on material curtain by high-pressure nozzle；
Particle after being coated for the first time drops down onto fluidized bed drum coating motor spindle, is promoted on fluidized bed, carries out secondary through shovelling plate again
Fluidized coating；Circulation through three more than ten times, by fluidized bed drum coating drive end unit discharging, packet in the potassium phosphate,monobasic after coating
Membrane material multilayer uniform fold obtains slow-release fertilizer finished product in fertiliser granulates surface, screened, cooling.
Reference examples 1
(1) preparation of coated fertilizer；35kg industrial starch, 65kg deionized water are added into reaction kettle, rises under stiring
For temperature to 70 DEG C, gelatinization stirring 20min adds 20kg polylactic acid, 2kg rilanit special, 2kg sorbitol ester, stirs lower heating
To 85 DEG C, isothermal reaction time 2h, 40 DEG C are cooled to, 1kg biological bacteria is added and stirs 0.5h, stands 10min to get coating material is arrived
Material；
(2) preparation of slow-release fertilizer: 200kg urea is poured into fluidized bed drum seed-coating machine, is preheating to 80 DEG C in preheating zone
DEG C, it into fluidized coating area, is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, fluidized in bed box body
It is passed through 80 DEG C of preheated air, material is held up and is flowed downward by hot-air at inclined bed bottom, it is fallen in bed lowest point, under
Uniform material curtain layer is formed during falling；The coated fertilizer that 16kg is prepared is sprayed on material curtain by high-pressure nozzle；It is wrapped for the first time
Particle after clothing drops down onto fluidized bed drum coating motor spindle, is promoted on fluidized bed through shovelling plate again, carries out secondary fluidized coating；
Circulation through three more than ten times, the urea after coating by fluidized bed drum coating drive end unit discharging, uniformly cover by coated fertilizer multilayer
It covers in fertiliser granulates surface, it is screened, cooling, obtain slow-release fertilizer finished product.
Reference examples 2
(1) modification of polylactic acid: 25kg polylactic acid being added in the ethyl alcohol that concentration is 75%, be heated to reflux state,
Insulated and stirred 10min, 15kg polyethylene glycol 400,25kg hydroxypropyl methyl cellulose and 0.1kg perbenzoic acid is then added
The tert-butyl ester, return stirring 2h stand 10min, and three ester of 2kg citric acid fourth is then added, and continue return stirring 0.5h, while hot mistake
Filter, gained precipitating deionized water and dehydrated alcohol wash away impurity, are sent into 100-110 DEG C of drying box, it is dry to constant weight to get
To polydactyl acid；
(2) preparation of coated fertilizer；35kg industrial starch, 65kg deionized water are added into reaction kettle, rises under stiring
For temperature to 70 DEG C, gelatinization stirring 20min adds 20kg polydactyl acid, 2kg rilanit special, 2kg sorbitol ester, under stirring
85 DEG C, isothermal reaction time 2h are warming up to, is cooled to 40 DEG C, stirs 0.5h, stands 10min to get coated fertilizer is arrived；
(3) preparation of slow-release fertilizer: 200kg urea is poured into fluidized bed drum seed-coating machine, is preheating to 80 DEG C in preheating zone,
It into fluidized coating area, is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, fluidized and be passed through in bed box body
80 DEG C of preheated air, material are held up and are flowed downward by hot-air at inclined bed bottom, fall, fall in bed lowest point
Uniform material curtain layer is formed in journey；The coated fertilizer that 16kg is prepared is sprayed on material curtain by high-pressure nozzle；After being coated for the first time
Particle drop down onto fluidized bed drum coating motor spindle, be promoted on fluidized bed through shovelling plate again, carry out secondary fluidized coating；Through three
Circulation more than ten times, by fluidized bed drum coating drive end unit discharging, coated fertilizer multilayer uniform fold exists the urea after coating
Fertiliser granulates surface, it is screened, cooling, obtain slow-release fertilizer finished product.
Embodiment 3
It is arranged based on embodiment 1 and the reference examples 1 of processing is not modified to polylactic acid, do not add the control of biological bacteria
Example 2.
Slow-release fertilizer is prepared using embodiment 1-3, reference examples 1-2, and the performance of slow-release fertilizer is measured, as a result such as table 1
It is shown.
The service performance of 1 slow-release fertilizer of table
| Test item | Preliminary solubility (%) | Differential solubility (%) | 28 days dissolution rates (%) |
| Embodiment 1 | 4.71 | 0.67 | 35 |
| Embodiment 2 | 4.73 | 0.65 | 37 |
| Embodiment 3 | 4.68 | 0.71 | 35 |
| Reference examples 1 | 15.21 | 2.52 | 81 |
| Reference examples 2 | 8.32 | 1.34 | 62 |
The above sample is measured 25 according to " slow release fertilizer " national standard (GB/T23348-200) that China in 2009 formulates
Dissolution experiment at DEG C: 10g slow release fertilizer is weighed, is put into the double-deck pouch that 100 mesh nylon gauzes are made into, is sealed, by pouch
It is put into the plastic bottle containing 250ml distilled water, seals, 25 DEG C of constant temperature incubations, separated in time sampling, every sub-sampling
When water sample moved into another bottle, shake up rear test sample.250ml distilled water is added into the bottle equipped with nylon cloth again, is added
It is put into insulating box after lid sealing, continues to cultivate, every kind of fertilizer carries out 3 parallel tests.According to test result, measurement 24 is calculated
The preliminary solubility of the fertilizer dissolved out in fertilizer core in hour.The fertilizer nutrient of preliminary solubility (%)=24 hour dissolution
Gross mass × 100% of fertilizer nutrient in quality/fertilizer sample；Differential solubility (%)=(amount of nutrients being dissolved in water/
The nitrogen pool * 100- preliminary solubility of slow-release fertilizer)/(release number of days -1)；28 days accumulative dissolution rate (%)=28 day fertilizer nutrients
Cumulative release amount/fertilizer nutrient total content × 100%.
According to the standard, 24 hours preliminary solubilities should be not more than 15%, differential solubility 0.25-2.5%, and 28
Its accumulative dissolution rate < 80%.It may determine that the performance of coated fertilizer by dissolution rate, dissolution rate is excessively high, indicates, coated fertilizer
Performance it is bad, be easily broken.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of preparation method of polydactyl acid slow-release fertilizer, which comprises the following steps:
(1) modification of polylactic acid: polylactic acid is added in the ethyl alcohol that concentration is 75%, is heated to reflux state, insulated and stirred
10-20min, polyethylene glycol 400, hydroxypropyl methyl cellulose and catalyst is then added, return stirring 1-3h stands 5-
Then three ester of citric acid fourth is added in 10min, continue return stirring 0.5-1h, filter while hot, gained precipitating deionized water and nothing
Water-ethanol washes away impurity, is sent into 100-110 DEG C of drying box, dries to constant weight to get polydactyl acid is arrived；
(2) preparation of coated fertilizer；Industrial starch, deionized water are added into reaction kettle, is warming up to 70-80 DEG C under stiring,
Gelatinization stirring 20-30min, adds polydactyl acid, rilanit special, sorbitol ester, 85 DEG C -90 DEG C is warming up under stirring,
Isothermal reaction time 1-2h is cooled to 40-50 DEG C, and biological bacteria is added and stirs 0.5-1h, stands 10-20min to get coating material is arrived
Material；
(3) preparation of slow-release fertilizer: fertilizer is poured into fluidized bed drum seed-coating machine, is preheating to 80 DEG C -90 DEG C in preheating zone, is entered
Fluidized coating area is promoted at the top of rotary drum by shovelling plate, then scatters the surface of fluidized bed, is fluidized in bed box body and is passed through 70
DEG C -80 DEG C of preheated air, material are held up and are flowed downward by hot-air at inclined bed bottom, fall in bed lowest point, under
Uniform material curtain layer is formed during falling；After the coated fertilizer prepared is measured by total coating rate 8-10wt%, by high-pressure nozzle
It is sprayed on material curtain；Particle after being coated for the first time drops down onto fluidized bed drum coating motor spindle, is promoted to fluidized bed through shovelling plate again
On, carry out secondary fluidized coating；Circulation through three more than ten times, the fertilizer after coating are gone out by fluidized bed drum coating drive end unit
Material, coated fertilizer multilayer uniform fold obtain slow-release fertilizer finished product in fertiliser granulates surface, screened, cooling.
2. the preparation method of polydactyl acid slow-release fertilizer according to claim 1, it is characterised in that: the polylactic acid is gathered
Ethylene glycol 400, hydroxypropyl methyl cellulose, catalyst, three ester of citric acid fourth mass ratio be 20-30:10-20:20-30:
0.1-0.5:1-5.
3. the preparation method of polydactyl acid slow-release fertilizer according to claim 2, it is characterised in that: point of the polylactic acid
Son amount is 5000-20000, elongation at break 4-10%；The molecular weight of the hydroxypropyl methyl cellulose is 10000-
100000。
4. the preparation method of polydactyl acid slow-release fertilizer according to claim 2, it is characterised in that: the catalyst was
Aoxidize t-butyl perbenzoate.
5. the preparation method of polydactyl acid slow-release fertilizer according to claim 1, it is characterised in that: the industrial starch,
Deionized water, polydactyl acid, rilanit special, sorbitol ester, biological bacteria mass ratio be 30-40:60-80:20-30:1-
5:1-5:1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811276240.9A CN109336674A (en) | 2018-10-30 | 2018-10-30 | A kind of preparation method of polydactyl acid slow-release fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811276240.9A CN109336674A (en) | 2018-10-30 | 2018-10-30 | A kind of preparation method of polydactyl acid slow-release fertilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109336674A true CN109336674A (en) | 2019-02-15 |
Family
ID=65311241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811276240.9A Withdrawn CN109336674A (en) | 2018-10-30 | 2018-10-30 | A kind of preparation method of polydactyl acid slow-release fertilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109336674A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111646866A (en) * | 2020-07-21 | 2020-09-11 | 齐亚龙 | Long-acting slow-release compound fertilizer and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626598A (en) * | 2013-12-23 | 2014-03-12 | 史丹利化肥股份有限公司 | Functional chitosan biological slow-release fertilizer and preparation method thereof |
| CN104629092A (en) * | 2014-12-04 | 2015-05-20 | 马新亮 | Nano-chitosan composite material and nano-coated particle products |
| CN106116983A (en) * | 2016-06-24 | 2016-11-16 | 临沂艺瑞农业发展有限公司 | A kind of biodegradable coat fertilizer and production method thereof |
| CN106748260A (en) * | 2017-01-18 | 2017-05-31 | 成都市四友生物科技有限公司 | A kind of slow-release fertilizer and preparation method thereof, preparation system |
| CN108358690A (en) * | 2018-02-06 | 2018-08-03 | 兰溪市沉默生物科技有限公司 | A kind of preparation method of selenium-enriched plant source synergy biology complex capsule fertilizer |
-
2018
- 2018-10-30 CN CN201811276240.9A patent/CN109336674A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103626598A (en) * | 2013-12-23 | 2014-03-12 | 史丹利化肥股份有限公司 | Functional chitosan biological slow-release fertilizer and preparation method thereof |
| CN104629092A (en) * | 2014-12-04 | 2015-05-20 | 马新亮 | Nano-chitosan composite material and nano-coated particle products |
| CN106116983A (en) * | 2016-06-24 | 2016-11-16 | 临沂艺瑞农业发展有限公司 | A kind of biodegradable coat fertilizer and production method thereof |
| CN106748260A (en) * | 2017-01-18 | 2017-05-31 | 成都市四友生物科技有限公司 | A kind of slow-release fertilizer and preparation method thereof, preparation system |
| CN108358690A (en) * | 2018-02-06 | 2018-08-03 | 兰溪市沉默生物科技有限公司 | A kind of preparation method of selenium-enriched plant source synergy biology complex capsule fertilizer |
Non-Patent Citations (3)
| Title |
|---|
| 杜昌文等: "控释肥料的研制及其进展", 《土壤》 * |
| 杨美娟等: "聚乙二醇对聚乳酸/ 热塑性淀粉复合材料性能的影响", 《工程塑料应用》 * |
| 游胜勇等: "复相乳液法制备可降解的缓释微胶囊肥料", 《江苏农科科学》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111646866A (en) * | 2020-07-21 | 2020-09-11 | 齐亚龙 | Long-acting slow-release compound fertilizer and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101391928B (en) | Fertilizer composition and use thereof | |
| CN102515945B (en) | Algae-enhanced urea, production method thereof, and purpose thereof | |
| CN102584365B (en) | Active improved soil fertilizer and production method thereof | |
| CN102875234B (en) | Novel synergetic compound fertilizer and preparation method thereof | |
| CN106831210A (en) | A kind of green house of vegetables special nutrient soil and preparation method thereof | |
| CN101723752A (en) | Biodegradable coated compound fertilizer and preparation method thereof | |
| CN102584477A (en) | Slowly-releasing water conservation biological organic and inorganic compound fertilizer particles and production method thereof | |
| CN101712569B (en) | Special rice organic-inorganic compound fertilizer and preparation method thereof | |
| CN103044146A (en) | Complex control type long-acting controlled-release organic and inorganic biological fertilizer | |
| CN110606779A (en) | High-tower humic acid compound fertilizer and preparation method thereof | |
| CN101723751A (en) | Biodegradable coated carbamide and preparation method thereof | |
| CN103739397A (en) | Process for preparing urea formaldehyde compound fertilizer | |
| CN104177204A (en) | Long-effect slow release strawberry fertilizer and preparation method thereof | |
| CN102627973A (en) | Preparation method of straw pulp mulch film | |
| CN108484300A (en) | Ureaformaldehyde Synergistic composite fertilizer production technology | |
| CN103159550A (en) | Environment-friendly slow-release sulfur-based nitrogen potassium compound fertilizer | |
| CN103274854A (en) | Algae synergistic high-tower compound fertilizer and production method thereof | |
| CN1850742A (en) | Environment-protection type coated release-controlled urea and preparing method | |
| CN101712570A (en) | Special organic/inorganic compound fertilizer for corn and preparation method thereof | |
| CN104446723A (en) | Method for producing organic fertilizers by mixing vinasse with pig manure | |
| CN107188685A (en) | A kind of Dryland plum plants dedicated fertilizer | |
| CN104130067B (en) | A kind of slow-release or control-release fertilizer peplos agent | |
| CN101560114A (en) | Pig-manure compost preparation method with fast temperature rise and dehydration and less composting time | |
| CN109336674A (en) | A kind of preparation method of polydactyl acid slow-release fertilizer | |
| CN108727136A (en) | Ureaformaldehyde Synergistic composite fertilizer production technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190215 |