CN106927951A - Based on water dispersion nano SiO2Modified water base polyacrylate film-coated controlled release fertilizer and preparation method thereof - Google Patents
Based on water dispersion nano SiO2Modified water base polyacrylate film-coated controlled release fertilizer and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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Abstract
Based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer, film-coated controlled release fertilizer is made up of the fertile slug particle macromolecule coating outside with it, is characterized in that macromolecule coating is water dispersion nano SiO2Modified water base polyacrylate dispersion；Described water dispersion nano SiO2Account for the 0.1% ~ 2.5% of water base polyacrylate dry；The quality of described macromolecule coated fertilizer dry accounts for the 5% ~ 15% of fertile slug particle quality.The preparation of the water base polyacrylate dispersion of its preparation process, the preparation of coating solution and the part of preparation three of coated fertilizer.0.5% water dispersion nano SiO is used by the present invention2Modified water base polyacrylate dispersion, the mechanical strength and polymer capsule of polymer and the adhesive force of fertilizer are all improved, and the coated carbamide prepared with the complex emulsions is not only environment-friendly, and controlled-release effect is excellent, preliminary solubility is 3.6%, and preparation is 11.3% within 7 days.
Description
Technical field
The invention belongs to technical field of fertilizer manufacture, and in particular to one kind is based on water dispersion nano SiO2Modified water base poly- third
Olefin(e) acid ester coated fertilizer, and it is this based on water dispersion nano SiO2The preparation side of modified water base polyacrylate coated fertilizer
Method.
Background technology
20th century Per Unit Area Grain Yield 1/2,1/3 contribution from chemical fertilizer of total yield.Consume in the arable land that China accounts for the world 10%
The fertilizer in the world 1/3, unit area dose is 3 times of world's average amount of fertilizer applied[1].Utilization rate of fertilizer is low, not only causes huge
Big economy and Pressure on Energy, more cause a series of environmental problem[2].Countries in the world all can improve nutrition efficient in development
The slowly/controlled releasing fertilizer for utilizing, wherein polymer coated fertilizer are study hotspots in recent years[3].Polymer coated fertilizer is to utilize
Macromolecule organic polymer carries out coating in traditional instant fertilizer particle surface, and being formed has certain thickness film, and passes through
The osmosis of film realizes slowing down or controlling a class release and release control fertilizer of nutrients release purpose[4]。
Organic high molecular polymer is good because of elasticity, and controlled-release effect stabilization, is existing industrialized main coated fertilizer[3], such as
Japanese Chisso-fertilizer company of Asahi Chemical Industry（Chisso Asahi Fertilizer Co., Ltd）The polyolefin of invention is coated release-controlled
Nitrogenous fertilizer Nutricote, the alkyd resin coated fertilizer Osmocote of Scotts companies of U.S. exploitation, Haifa companies of Israel open
The Multicote with polyurethane as coated fertilizer of hair, is the organic high molecular polymer coat fertilizer of current commercialization
Material.But these polymer coated fertilizers need to use organic solvent in process, secondary pollution and initiation are easily caused
Safety problem.Water-based polymer coated controlled release fertilizer quickly grows in recent years, and as current polymer coating controlled release fertilizer one
Big study hotspot[3].With water as solvent, building-up process is not required to organic solvent to aqueous-based polymers, and finished product is tasteless, and degradable, is regarded
It is preferable environmentally friendly coated release-controlled material[5,6].In numerous aqueous-based polymers, water base polyacrylate dispersion is because of tool
Have the advantages that source wide, relative low price, be easily-synthesized, good film-forming property, viscosity are adapted to, manufacture storage transport is without fire hazard quilt
It is widely used in coated fertilizer field[7-9].But water base polyacrylate insufficient strength, poor water resistance, cause as coating material
Expect that the water-based polymer coated fertilizer nutrient release for preparing is fast, coated fertilizer low intensity occurs bright during coated fertilizer release
Aobvious swelling, phase coating is easily disturbed and ruptured upon discharge, and the coated fertilizer for making the controlled release phase in hydrostatic long is controlled in actual field
Release the phase shortens on the contrary, cannot meet the nutrient demand of the season of growth whole Growing season of paddy rice more long.In order to slow down water based polymerization
The nutrient release rate of thing coated fertilizer, improves the mechanical strength of coated fertilizer, and the physics of various modes is carried out to coated fertilizer
Chemical modification is a current common practice.
Solid nano SiO2High-specific surface area it is easily reunited, be finally difficult to be uniformly dispersed.And water dispersion nano SiO2
All it is water separate system with water base polyacrylate dispersion, so both can preferably be blended, forms homogeneous system.Grind
Study carefully and show using the method for in-situ emulsion polymerization, nano silicon dioxide sol and acrylate monomer are reacted, prepare nanometer
Silica/poly acrylate composite emulsion, as a result shows that the adhesive force of emulsion is improved, and mechanical properties of polymer is improved[10].So
And adopt water-dispersible SiO2The data of modified water base polyacrylate dispersion has no report, water-dispersible Nano-meter SiO_22Modified
The patent and documents and materials that water base polyacrylate makes coated fertilizer do not have been reported that yet.
Bibliography
[1] Zhao Bingqiang, woods public security, Liu increases and China fertilizer industry Ei carrys out road for development-raising utilization rate of fertilizer, reduces
Fertilizer amount [J] phosphate fertilizer and compound fertilizer, 2008,23 (6): 1-4.
[2]Shaviv, A. Mikkelsen R. L. 1993. Controlled-release fertilizers to
increase efficiency of nutrient use and minimize environmental degradation-A
review[J].Nutr.Cycl.Agroecos.35: 1–12.
The present state and perspectives of [3] Fan little Lin, Liu Fang, Liao Zhaoyuan, Zheng Xiangzhou, Yu Jiangang China release and release control fertilizer research
[J] plant nutrients and fertilizer journal 2009,15 (2):463-473.
[4] the water-based polymer coated production technique for fertilizer of Zhao Cong and optimization [D] Beijing:Postgraduate School, Chinese Academy of Sciences,
2011.
[5] Hu Shuwen are a kind of water-based polymer coated and its preparation method [P] CN of film-coated controlled release fertilizer:
CN200710178608.3, 2008.05.21.
[6] a kind of biological degradable multifunctional automatic control slow release fertilizers of vast stretch of wooded country great waves and preparation method thereof [P] CN:
CN200810015602.9, 2008.08.20.
[7]Donida, M.W., Rocha, S.C. 2002. Coating of urea with an aqueous
polymeric suspension ion a two-dimensional spouted bed[J]. Dry. Technol. 20
(3): 685–704.
[8]da Rosa, G.S., and dos Santos Rocha, S.C. 2012. Use of vinasse to
produce slow–release coated urea in spouted bed[J]. Can. J. Chem. Eng. 91:
589–597.
[9] Du Changwen, Shen Yazhen, Zhou Jianmin are based on the polymer coating controlled release fertilizer and its system of water-based reactions film technique
Preparation Method [P] ZL201010157430.6,2010.04.27.
[10] preparation of Ye Yuzuo nano silicon/polyacrylate composite emulsions and sign [D] Guangzhou:Manage in south China
Work university, 2011.
The content of the invention
Water dispersion nano SiO is based on it is an object of the invention to provide one kind2Modified water base polyacrylate coated fertilizer,
And it is this based on water dispersion nano SiO2The preparation method of modified water base polyacrylate coated fertilizer.The present invention can gram
Water-based polymer coated controlled release fertilizer nutrients release of the prior art is taken fast, the drawbacks of coated fertilizer low intensity, by this hair
The water-based polymer coated controlled release urea controlled-release effect of open-birth output is good, and preliminary solubility is 3.6%, the preparation of 7 days
It is 11.3%.
Completing the technical scheme of first invention task of the application is：One kind is based on water dispersion nano SiO2Modified is water base
Polyacrylate coated fertilizer, by fertilizer（Fertile slug particle）Constituted with its outside macromolecule coating, it is characterised in that described
Macromolecule coating is water dispersion nano SiO2Modified water base polyacrylate dispersion；Dry in described macromolecule coated fertilizer
The quality of matter accounts for the 5% ~ 15% of fertile slug particle quality；
The mass ratio that described water base polyacrylate dispersion raw material is constituted is：80 ~ 120g of butyl acrylate, methyl methacrylate
The g of ester 80 ~ 120, the g of methacrylic acid 3 ~ 7, the g of potassium peroxydisulfate 0.68, neopelex 3.09 ~ 5.15 g, OP-
108.24 g, are formed by semi-continuous emulsion polymerizing；Described water dispersion nano SiO2Account for water base polyacrylate dry
0.1%~2.5%。
Described fertilizer（Fertile slug particle）Various agricultural fertilizers commonly used in the prior art, including various chemistry can be used
Fertilizer, compound fertilizer or other functions fertilizer.Above fertilizer is made particle by the granulating technique of prior art.
Water dispersion nano SiO of the invention2The optimum formula of modified water base polyacrylate dispersion is：
Butyl acrylate 110g, the g of methyl methacrylate 90, the g of methacrylic acid 5, the g of neopelex 4.12,
OP-108.24 g, the g of potassium peroxydisulfate 0.68, water 250g, water dispersion nano SiO20.5 wt%。
Completing the technical scheme of second invention task of the application is：One kind is based on water dispersion nano SiO2Modified is water base
The preparation technology of polyacrylate coated fertilizer, including water base polyacrylate dispersion preparation, be coated emulsion preparation, and
The part of preparation three of coated fertilizer：
Wherein, the preparation of water base polyacrylate dispersion：
(1), emulsifying agent neopelex and OP-10 are dissolved in deionized water, stirring forms homogeneous aqueous phase；
(2), by described butyl acrylate, three kinds of acrylate monomer mixing shapes of methyl methacrylate and methacrylic acid
Into oil phase；
(3) the oil phase for, (2) obtaining step is added in step water phase (1), continuously stirs 30min and pre-emulsion is obtained；
(4) the pre-emulsion that (3) 75% step obtains, is poured out from there-necked flask, electric jacket is opened, after rising to 85 DEG C etc. reaction temperature,
By initiator solution（50ml, 0.013 g/mL K2S2O8）Four parts are divided into the pre-emulsion poured out from there-necked flask, are replaced successively
Add, it is 200 rpm that whole process maintains stir speed (S.S.).After being added Deng pre-emulsion and initiator solution, system is set to be kept for 85 DEG C
Continue to react 3h.Electric jacket is finally closed, when system temperature is dropped to below 40 DEG C, emulsion crosses the discharging of 200 eye mesh screens.Water is obtained
Based polyacrylic acid ester emulsion mother liquor.
Coating solution is prepared：
On the basis of the water base polyacrylate dispersion of the known solid content for having prepared, according to wanting for actual nutrient controlled release phase
Ask, selection dry accounts for the water base polyacrylate dispersion of the 5% ~ 15% of fertile slug particle quality.Water base polyacrylate will be accounted for again
The water dispersion nano SiO of dry 0.1% ~ 2.5%2It is added in water base polyacrylate dispersion, finally again in coated systems
The deionized water of 50-250 mL is added, stirring is obtained coating solution in 5 minutes.
It is prepared by coated fertilizer：
With the coating solution being made into and fertile slug particle（Urea or composite fertilizer）Together, coated fertilizer is made using fluidized-bed coating machine.
The present invention is used by water dispersion nano SiO2Modified water base polyacrylate dispersion is used as coating polymer master
Body, the water-based polymer coated controlled release fertilizer produced by the present invention is not only environment-friendly, and controlled-release effect is good, the initial stage
Dissolution rate is 3.6%, and preparation is 11.3% within 7 days.
Brief description of the drawings
Fig. 1 water dispersion nanos SiO2Influence to water base polyacrylate coated fertilizer cumulative release feature.C is water base poly-
Coated carbamide prepared by acrylic acid ester emulsion, C-Nano (0.5%) is with 0.5% water dispersion nano SiO2Modified water-base gathers
Coated carbamide prepared by acrylic acid ester emulsion, C-Nano (1.5%) is with 1.5% water dispersion nano SiO2Modified water-base poly- third
Coated carbamide prepared by olefin(e) acid ester emulsion.
The assay method of nutrients accumulation release profiles：It is complete particle to be picked out from the coated fertilizer of sealing preserve at random
Coated fertilizer, each 3 repetition for the treatment of, each repeats 5g, the coated fertilizer correct amount that each is repeated（It is accurate to decimal point
Two afterwards）The wide-mouth bottle for filling 100ml deionized waters is placed in afterwards（Rubber stopper is sealed）In, it is put into 25 DEG C of incubators, Mei Geyi
Fix time and take a sample.After per sub-sampling, all leachates in wide-mouth bottle are all poured out, rejoin 100ml deionized waters
Cultivated in continuation in 25 DEG C of cultures.Urea is determined using dimethylaminobenzaldehyde colorimetry on Flow Analyzer.
Wherein, C is coated carbamide prepared by water base polyacrylate dispersion, and C-Nano (0.5%) is with 0.5% water
Dispersion Nano-meter SiO_22Coated carbamide prepared by modified water-base polyacrylate dispersion, C-Nano (1.5%) is with 1.5% moisture
Dissipate Nano-meter SiO_22Coated carbamide prepared by modified water-base polyacrylate dispersion.
Specific embodiment
Embodiment 1, based on water base polyacrylate film-coated controlled release fertilizer：
The preparation of a, water base polyacrylate dispersion：First by neopelex 4.12 g, OP-10 8.24 g emulsification
Agent and 250ml deionized waters are placed in the round bottom there-necked flask of 1L, and stirring forms homogeneous aqueous phase.Again by butyl acrylate 110g,
The g of methyl methacrylate 90, the g of methacrylic acid 5 are mixed to form oil phase.After 30min is continuously stirred in oil phase addition water phase
Form pre-emulsion.75% pre-emulsion is poured out from there-necked flask, electric jacket is opened, after rising to 85 DEG C etc. reaction temperature, will be triggered
Agent solution（50ml, 0.013 g/mL K2S2O8）Four parts are divided into the pre-emulsion poured out from there-necked flask be alternately added reaction successively
In system, whole process maintains the stir speed (S.S.) of 200rpm.After pre-emulsion and initiator solution are added, system is set to be kept for 85 DEG C
Continue to react 3h.Electric jacket is finally closed, when system temperature is dropped to below 40 DEG C, emulsion crosses the discharging of 200 eye mesh screens.Water is obtained
Based polyacrylic acid ester emulsion mother liquor.
The preparation of b, coating solution：The solid content of water base polyacrylate dispersion prepared by step a is about 40.7%, using dry
The water base polyacrylate conventional emulsion that material accounts for fertile slug particle quality 10% makes coated fertilizer as material.Weigh water base poly-
Acrylate conventional emulsion mother liquor 98.28g, stirs 5 minutes prepared coating solutions after mixing with 100 mL deionized waters.
It is prepared by c, coated fertilizer：Using small-sized fluidized bed coating equipment in sugar production line, such as the good dry dry instrument factory production in changzhou
LDP-3 type fluidized bed coating equipments, granulated fertilizer and coating solution are put into fluidized bed coating equipment.The process of fluidized bed coating
In, flow velocity, EAT, EAT and atomizing pressure of coating solution etc. are suitably adjusted according to the property of coating solution and be coated ginseng
Number, makes the moisture evaporation speed in coating process consistent with film forming speed, in order to avoid influence film forming and cause to be coated failure.About
Complete a coating process within 1.5-2 hours.Fluidized bed coating main control parameters scope is as follows：
It is coated flow velocity：1 rpm
EAT：50 ℃
Leaving air temp：40 ℃
Atomizing pressure：0.12 Mpa
The coated fertilizer of making is water base poly- emulsion coated fertilizer, and numbering is C.Its release mode is in Fig. 1 shown in C curve, should
After fertilizer discharges 1 day in 25 DEG C of deionized water, release rate is about 24.9%, and preparation reaches 43.5% after 7 days.Performance
Out certain controlled-release effect, has certain identical property with the nutrient demand type of plant, but primary dissolution rate is too high, and
Quick-acting fertilizer blending is applied to easily cause burn seedlings phenomenon when field produces as the form of controlled release BB fertilizer, it is therefore necessary to enter one
Step slows down nutrient release rate.
Embodiment 2, based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer：
The preparation of a, water base polyacrylate dispersion：First by neopelex 4.12 g, OP-10 8.24 g emulsification
Agent and 250ml deionized waters are placed in the round bottom there-necked flask of 1L, and stirring forms homogeneous aqueous phase.Again by butyl acrylate 110g,
The g of methyl methacrylate 90, the g of methacrylic acid 5 are mixed to form oil phase.After 30min is continuously stirred in oil phase addition water phase
Form pre-emulsion.75% pre-emulsion is poured out from there-necked flask, electric jacket is opened, after rising to 85 DEG C etc. reaction temperature, will be triggered
Agent solution（50ml, 0.013 g/mL K2S2O8）Four parts are divided into the pre-emulsion poured out from there-necked flask be alternately added reaction successively
In system, whole process maintains the stir speed (S.S.) of 200rpm.After pre-emulsion and initiator solution are added, system is set to be kept for 85 DEG C
Continue to react 3h.Electric jacket is finally closed, when system temperature is dropped to below 40 DEG C, emulsion crosses the discharging of 200 eye mesh screens.Water is obtained
Based polyacrylic acid ester emulsion mother liquor.
The preparation of b, coating solution：The solid content of water base polyacrylate dispersion prepared by step a is about 40.7%, using dry
The water base polyacrylate dispersion that material accounts for fertile slug particle quality 10% makes coated fertilizer as material.Weigh water base polypropylene
Acid esters emulsion mother liquor 98.28g, then weigh the water dispersion nano SiO for accounting for water base polyacrylate dry 0.5%2Dispersion liquid
(30%) 0.66 g is added in water base polyacrylate dispersion, finally adds 100 mL deionized waters, is stirred 5 minutes and is obtained
Coating solution.
It is prepared by c, coated fertilizer：Using small-sized fluidized bed coating equipment in sugar production line, coating solution prepared by granular urea and step b is put
In fluidized bed coating equipment in sugar production line.The process and parameter setting of fluidized bed coating are same as Example 1.
The coated fertilizer of making is 0.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide, its release
Pattern is for shown in C-Nano (0.5%) curve, after the fertilizer discharges 1 day in 25 DEG C of deionized water, release rate is about in Fig. 1
3.6%, preparation reaches 11.3% after 7 days, has showed excellent controlled-release effect.With unmodified water base polyacrylic acid
Ester coated fertilizer is compared, with 0.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide nutrient release rate
Substantially slow down, preliminary solubility drops to 3.6% from unmodified 24.9%, and 7 days preparations are reduced to from unmodified 41.5%
11.3%.Therefore with 0.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide and quick-acting fertilizer are with controlled release BB
Burn seedlings is cannot be easily caused during the form application of fertilizer, in addition the mechanical strength increase of polymer capsule, after coated fertilizer is applied
It is not susceptible to external disturbance and ruptures, it is easier to and the nutrient demand of crop matches.
Embodiment 3, based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer：
The preparation of a, water base polyacrylate dispersion：The preparation technology and formula and the phase of embodiment 1 of water base polyacrylate dispersion
Together.
The preparation of b, coating solution：The solid content of water base polyacrylate dispersion prepared by step a is about 40.7%, using dry
The water base polyacrylate dispersion that material accounts for fertile slug particle quality 10% makes coated fertilizer as material.Weigh water base polypropylene
Acid esters emulsion mother liquor 98.28g, then weigh the water dispersion nano SiO for accounting for water base polyacrylate 1.5%2Dispersion liquid (30%)
1.98 g are added in water base polyacrylate dispersion, finally add 100 mL deionized waters, stir 5 minutes and coating is obtained
Liquid.
It is prepared by c, coated fertilizer：Using small-sized fluidized bed coating equipment in sugar production line, coating solution prepared by granular urea and step b is put
In fluidized bed coating equipment in sugar production line.The process and parameter setting of fluidized bed coating are same as Example 1.
The coated fertilizer of making is 1.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide, its release
Pattern is for shown in C-Nano (1.5%) curve, after the fertilizer discharges 1 day in 25 DEG C of deionized water, release rate is about in Fig. 1
14.3%, preparation reaches 32.8% after 7 days, shows excellent controlled-release effect.With unmodified water base polyacrylic acid
Ester coated fertilizer is compared, with 1.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide nutrient release rate
It has been slowed down that, preliminary solubility drops to 14.3% from unmodified 24.9%, and 7 days preparations are reduced from unmodified 41.5%
To 32.8%.With 1.5% water dispersion nano SiO2Modified water-base polyacrylate, although the nutrients release of coated carbamide has dropped
It is low, but the amplitude for reducing can not show a candle to 0.5% water dispersion nano SiO2Modified effect.Because water-dispersible Nano-meter SiO_22It is modified
After water base polyacrylate, the adhesive force of polymer and fertilizer surface, and the intensity of polymer all increases.But in original
Have in water base polyacrylate dispersion system, the consumption of surfactant is certain, add excess moisture to dissipate Nano-meter SiO_22After can make
Into the Nano-meter SiO_2 of a part2Reunite in new system, and these reunions cause the heterogeneity of composite membrane, finally influence it to support
Divide controlled-release effect.It is used for modified water dispersion nano SiO as can be seen here2Consumption be it is modified whether successful key factor.
Beneficial effect：
Accompanying drawing 1 shows, using water dispersion nano SiO2After modified water-base polyacrylate dispersion, the nutrients release speed of coated carbamide
Rate is efficiently controlled.Compared with unmodified water base polyacrylate dispersion, 0.5% water dispersion nano SiO2Modified
Water base polyacrylate coated carbamide preliminary solubility drops to 3.6% from unmodified 24.9%, and 7 days preparations are from unmodified
41.5% be reduced to 11.3%, and 1.5% water dispersion nano SiO2Modified water base polyacrylate coated carbamide preliminary solubility
14.3% is dropped to from unmodified 24.9%, 7 days preparations are reduced to 32.8% from unmodified 41.5%.Water-dispersible nanometer
SiO2After modified water-base polyacrylate, the adhesive force of polymer and fertilizer surface, and the intensity of polymer all increases.
The preliminary solubility reduction of water base polyacrylate coated fertilizer is embodied in, nutrients release slows down.But with addition water
The water dispersion nano SiO of based polyacrylic acid ester emulsion system2It is continuously increased, and the content of system surfactant is certain, one
The Nano-meter SiO_2 for dividing2Reunite in new system, and these reunions cause the heterogeneity of composite membrane, finally influence its nutrient controlled release
Effect.
Claims (5)
1. it is a kind of to be based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer, by fertile slug particle and its outside
Macromolecule coating is constituted, it is characterised in that described macromolecule coating is by water dispersion nano SiO2Modified water base polyacrylic acid
Ester emulsion is constituted；The quality of described macromolecule coated fertilizer dry accounts for the 5% ~ 15% of fertile slug particle quality.
2. according to claim 1 based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer, its feature
It is, the water dispersion nano SiO2The mass ratio that modified water base polyacrylate dispersion raw material is constituted is：Butyl acrylate
80 ~ 120g, the g of methyl methacrylate 80 ~ 120, the g of methacrylic acid 3 ~ 7, the g of potassium peroxydisulfate 0.68, DBSA
6.18 ~ 10.30 g of g, OP-10 of sodium 3.09 ~ 5.15, is formed by semi-continuous emulsion polymerizing；Modified water dispersion nano SiO2
Account for the 0.1% ~ 2.5% of water base polyacrylate dry.
3. according to claim 2 based on water dispersion nano SiO2Modified water base polyacrylate coated fertilizer, its feature
It is, the water dispersion nano SiO2Water base polyacrylate dispersion raw material constitute mass ratio be：
Butyl acrylate 110g, the g of methyl methacrylate 90, the g of methacrylic acid 5, the g of neopelex 4.12,
OP-108.24 g, the g of potassium peroxydisulfate 0.68, water 250g, water dispersion nano SiO20.5 wt%。
4. described in claim 1 based on water dispersion nano SiO2The preparation method of modified water base polyacrylate coated fertilizer,
It is characterised in that it includes the preparation three of the preparation of water base polyacrylate dispersion, the preparation of coating emulsion, and coated fertilizer
Point：
Wherein, the preparation of water base polyacrylate dispersion：
(1) be dissolved in deionized water for emulsifying agent neopelex and OP-10 by, and stirring forms homogeneous aqueous phase；
(2) by described butyl acrylate, three kinds of acrylic monomers of methyl methacrylate and methacrylic acid are mixed to form
Oil phase；
(3) the oil phase that (2) obtains step is added in step water phase (1), continuously stirs 30min and pre-emulsion is obtained；
(4) pours out the pre-emulsion that (3) 75% step obtains from there-necked flask, opens electric jacket, after rising to 85 DEG C etc. reaction temperature,
The pre-emulsion poured out by initiator solution and from there-necked flask is divided into four parts, is alternately added successively, and whole process maintains stirring speed
Rate is 200 rpm；After being added Deng pre-emulsion and initiator solution, system is set to be kept for 85 DEG C continue to react 3h.Finally close electric heating
Set, when system temperature is dropped to below 40 DEG C, emulsion crosses the discharging of 200 eye mesh screens；Water base polyacrylate conventional emulsion is obtained；
Coating solution is prepared：
On the basis of the water base polyacrylate dispersion of the known solid content for having prepared, according to wanting for actual nutrient controlled release phase
Ask, selection dry accounts for the water base polyacrylate dispersion of the 5% ~ 15% of fertile slug particle quality；Water base polyacrylate will be accounted for again
The water dispersion nano SiO of dry 0.1% ~ 2.5%2It is added in water base polyacrylate dispersion, finally again in coated systems
The deionized water of 50 ~ 250 mL is added, stirring is obtained coating solution in 5 minutes；
It is prepared by coated fertilizer：
With the coating solution being made into together with fertile slug particle, coated fertilizer is made using fluidized-bed coating machine.
5. according to claim 4 based on water dispersion nano SiO2The preparation of modified water base polyacrylate coated fertilizer
Method, it is characterised in that step (4) described in initiator solution be 50ml, 0.013 g/mL K2S2O8。
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| CN107324901A (en) * | 2017-08-01 | 2017-11-07 | 中国科学院南京土壤研究所 | Polymer-modified composite film-coated controlled release fertilizer of graphene oxide and preparation method thereof |
| CN111517873A (en) * | 2020-04-02 | 2020-08-11 | 北部湾大学 | Controlled-release fertilizer coating agent and preparation method thereof, controlled-release fertilizer and application thereof |
| CN114634388A (en) * | 2022-04-25 | 2022-06-17 | 四川省农业科学院农业资源与环境研究所 | Controlled release fertilizer and preparation method thereof |
| CN114736070A (en) * | 2022-04-25 | 2022-07-12 | 四川省农业科学院农业资源与环境研究所 | Coated controlled-release fertilizer and preparation method thereof |
| CN114956902A (en) * | 2022-04-07 | 2022-08-30 | 江西师范大学 | Controlled-release zinc fertilizer for enriching zinc and reducing cadmium in brown rice and preparation method thereof |
| CN115197021A (en) * | 2022-07-18 | 2022-10-18 | 北部湾大学 | Modified polyacrylate coated slow-release compound fertilizer and preparation method thereof |
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| WO2023207330A1 (en) * | 2022-04-25 | 2023-11-02 | 四川省农业科学院农业资源与环境研究所 | Controlled-release fertilizer and preparation method therefor |
| CN115197021A (en) * | 2022-07-18 | 2022-10-18 | 北部湾大学 | Modified polyacrylate coated slow-release compound fertilizer and preparation method thereof |
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