CN106927951B - Based on water dispersion nano SiO2Modified water-based polyacrylate coated controlled release fertilizer and preparation method thereof - Google Patents
Based on water dispersion nano SiO2Modified water-based polyacrylate coated controlled release fertilizer and preparation method thereof Download PDFInfo
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Abstract
Based on water dispersion nano SiO2A modified water-base polyacrylate coated fertilizer with controlled release is prepared from fertilizer core particles and external high-molecular coating film made of water-dispersed nano SiO2Modified water-based polyacrylate emulsions; the water-dispersed nano SiO20.1-2.5% of water-based polyacrylate dry matter; the mass of the dry matter of the polymer coating material accounts for 5-15% of the mass of the fertilizer core particles. The preparation process comprises three parts of preparation of water-based polyacrylate emulsion, preparation of coating liquid and preparation of coated fertilizer. By adopting 0.5 percent of water-dispersed nano SiO2The mechanical strength of the polymer and the adhesive force of the polymer coating and the fertilizer of the modified water-based polyacrylate emulsion are improved, the coated urea prepared by the composite emulsion is environment-friendly, the controlled release effect is excellent, the initial dissolution rate is 3.6 percent, and the 7-day cumulative release rate is 11.3 percent.
Description
Technical Field
The invention belongs to the technical field of fertilizer manufacturing, and particularly relates to a water-dispersed nano SiO2Modified water-based polyacrylate coated fertilizer and water-dispersed nano SiO-based fertilizer2A preparation method of a modified water-based polyacrylate coated fertilizer.
Background
1/2 for food production per unit in the 20 th century, 1/3 for total production comes from fertilizer contribution. The cultivated land which accounts for 10 percent of the world in China consumes 1/3 fertilizers in the world, and the fertilizing amount per unit area is 3 times of the average fertilizing amount in the world[1]. FertilizerThe low utilization rate of materials not only causes great economic and energy pressure, but also causes a series of environmental problems[2]. The development of slow/controlled release fertilizers capable of improving the efficient utilization of nutrients is carried out in all countries in the world, wherein polymer coated fertilizers are hot research spots in recent years[3]. The polymer coated fertilizer is a controlled release fertilizer which utilizes high molecular organic polymer to coat the surface of the traditional instant fertilizer granules to form a film with a certain thickness and realizes the purpose of slowing or controlling the release of nutrients through the osmosis of the film[4]。
The organic high molecular polymer is a main coating material for the prior industrialization due to good elasticity and stable controlled release effect[3]For example, a polyolefin coated controlled release nitrogen Fertilizer nutrilite invented by japan asphyxia-Asahi Fertilizer co., Ltd), an alkyd resin coated Fertilizer osmolite developed by scott corporation in usa, and a Multicote developed by Haifa corporation in israel and using polyurethane as a coating material are all commercially available organic high molecular polymer coated fertilizers. However, these polymer coated fertilizers require the use of organic solvents during processing, which easily causes secondary pollution and raises safety concerns. In recent years, the water-based polymer coated controlled release fertilizer has rapidly developed and becomes a great research hotspot of the current polymer coated controlled release fertilizer[3]. The water-based polymer takes water as a solvent, does not need an organic solvent in the synthesis process, is tasteless and easy to degrade, and is considered as an ideal environment-friendly coated controlled-release material[5,6]. Among numerous water-based polymers, water-based polyacrylate emulsions are widely used in the field of coated fertilizers due to their advantages of wide sources, relatively low cost, easy synthesis, good film-forming properties, suitable viscosity, no fire hazard during manufacture, storage and transportation, and the like[7-9]. However, the water-based polyacrylate has insufficient strength and poor water resistance, so that the water-based polymer coated fertilizer prepared by using the water-based polyacrylate as the coating material has quick nutrient release, the coating material has low strength, the coated fertilizer is obviously swelled in the release process, the coating is easy to be disturbed and broken in the later release period, the controlled release period of the coated fertilizer with long controlled release period in still water is shortened in the actual field, and the requirement of the nutrient of rice in the whole growth season with long growth season cannot be metAnd (6) obtaining. In order to slow down the nutrient release rate of the water-based polymer coated fertilizer and improve the mechanical strength of the coating material, various physical and chemical modifications of the coating material are currently common practice.
Solid nano SiO2The high specific surface area of the composite material makes the composite material easy to agglomerate and difficult to disperse uniformly. While the water disperses the nano SiO2And the water-based polyacrylate emulsion is an aqueous dispersion system, so the two can be better blended to form a uniform system. The research shows that the nano silicon dioxide sol reacts with the acrylate monomer by adopting an in-situ emulsion polymerization method to prepare the nano silicon dioxide/polyacrylate composite emulsion, and the result shows that the adhesive force of the emulsion is improved, and the mechanical property of the polymer is improved[10]. However with water-dispersed SiO2The data of the modified water-based polyacrylate emulsion are not reported, and the nano SiO is dispersed by water2The patent and literature data of the modified water-based polyacrylate for preparing the coated fertilizer are not reported.
Reference to the literature
[1] Zhao inherits the strength, Lin Zhi an, Liu Zeng and China fertilizer industry develops new ways from beginning to end-improving the utilization rate of fertilizer and reducing the fertilizer dosage [ J ]. phosphate fertilizer and compound fertilizer, 2008, 23(6): 1-4.
[2]Shaviv, A. Mikkelsen R. L. 1993. Controlled-release fertilizers toincrease efficiency of nutrient use and minimize environmental degradation-Areview[J].Nutr.Cycl.Agroecos.35: 1–12.
[3] Yanxiaolin, Liufang, Liao Liang Yuan, Zheng Xiangzhong, Jiang just the present situation and the prospect of the research on the controlled release fertilizer in China [ J ]. the academic report on plant nutrition and fertilizer [ 2009, 15(2):463 and 473.
[4] Zhao cong, water-based polymer coated fertilizer production process and optimization [ D ] Beijing, institute of graduate institute of Chinese academy of sciences, 2011.
[5] Hu tree article, a preparation method of water-based polymer coating and its coated controlled release fertilizer [ P ]. CN: CN200710178608.3, 2008.05.21.
[6] A biodegradable multifunctional self-controlled slow-release fertilizer for forest waves is prepared from the biodegradable material (CN: CN200810015602.9, 2008.08.20).
[7]Donida, M.W., Rocha, S.C. 2002. Coating of urea with an aqueouspolymeric 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 toproduce slow–release coated urea in spouted bed[J]. Can. J. Chem. Eng. 91:589–597.
[9] Duchang, Shen Yazhen, Zhou Jianmin polymer coating controlled release fertilizer based on water-based reaction film forming technology and preparation method [ P ]. ZL201010157430.6, 2010.04.27.
[10] Preparation and characterization of leaf rain adjuvant, nano silicon dioxide/polyacrylate composite emulsion [ D ]. Guangzhou, university of south China's Rich chemical industry, 2011.
Disclosure of Invention
The invention aims to provide a water-dispersed nano SiO2Modified water-based polyacrylate coated fertilizer and water-dispersed nano SiO-based fertilizer2A preparation method of a modified water-based polyacrylate coated fertilizer. The invention can overcome the defects of quick nutrient release and low strength of coating materials of the water-based polymer coated controlled release fertilizer in the prior art, and the water-based polymer coated controlled release urea produced by the invention has good controlled release effect, the initial dissolution rate is 3.6 percent, and the cumulative release rate in 7 days is 11.3 percent.
The technical scheme for completing the first invention task of the application is as follows: water-dispersion-based nano SiO2The modified water-based polyacrylate coated fertilizer consists of fertilizer (fertilizer core particles) and a high polymer coating outside the fertilizer, and is characterized in that the high polymer coating is water-dispersed nano SiO2Modified water-based polyacrylate emulsions; the mass of dry substances in the high polymer coating material accounts for 5-15% of the mass of the fertilizer core particles;
the water-based polyacrylate emulsion comprises the following raw materials in percentage by mass: 80-120 g of butyl acrylate, 80-120 g of methyl methacrylate, 3-7 g of methacrylic acid, 0.68 g of potassium persulfate, 3.09-5.15 g of sodium dodecyl benzene sulfonate and OP-108.24 g of the mixture, and polymerizing the mixture by using a semi-continuous emulsion; the water-dispersed nano SiO20.1-2.5% of water-based polyacrylate dry matter.
The fertilizer (fertilizer core particles) can be various agricultural fertilizers commonly used in the prior art, including various chemical fertilizers, compound fertilizers or other functional fertilizers. The above fertilizers are made into granules by granulation technology of the prior art.
The water dispersible nano SiO of the invention2The optimal formula of the modified water-based polyacrylate emulsion is as follows:
110g of butyl acrylate, 90 g of methyl methacrylate, 5g of methacrylic acid, 4.12g of sodium dodecyl benzene sulfonate, OP-108.24 g, 0.68 g of potassium persulfate, 250g of water and water-dispersed nano SiO20.5 wt%。
The technical scheme for completing the task of the second invention of the application is as follows: water-dispersion-based nano SiO2The preparation process of the modified water-based polyacrylate coated fertilizer comprises three parts of preparation of water-based polyacrylate emulsion, preparation of coating emulsion and preparation of the coated fertilizer:
wherein, the preparation of the water-based polyacrylate emulsion comprises the following steps:
⑴, dissolving emulsifier sodium dodecyl benzene sulfonate and OP-10 in deionized water, and stirring to form uniform water phase;
⑵, mixing the butyl acrylate, the methyl methacrylate and the methacrylic acid to form an oil phase;
⑶, adding the oil phase obtained in the step ⑵ into the water phase obtained in the step ⑴, and continuously stirring for 30min to obtain a pre-emulsion;
⑷, pouring 75% of the pre-emulsion obtained in the step ⑶ from a three-mouth bottle, opening an electric heating sleeve, dividing an initiator solution (50 ml, 0.68 g of potassium persulfate) and the pre-emulsion poured out of the three-mouth bottle into four parts when the reaction temperature rises to 85 ℃, sequentially and alternately adding the four parts, keeping the stirring speed at 200rpm in the whole process, keeping the temperature of the system at 85 ℃ after the pre-emulsion and the initiator solution are added, continuing to react for 3h, finally closing the electric heating sleeve, and discharging the emulsion through a 200-mesh screen when the temperature of the system is reduced to below 40 ℃ to prepare the water-based polyacrylate emulsion mother liquor.
Preparing a coating emulsion:
on the basis of the prepared water-based polyacrylate emulsion with known solid content, the water-based polyacrylate emulsion with dry matter accounting for 5-15% of the mass of the fertilizer core particles is selected according to the requirement of the actual nutrient controlled release period. Then, dispersing water which accounts for 0.1-2.5% of the dry matter of the water-based polyacrylate to form nano SiO2Adding into water-based polyacrylate emulsion, adding 50-250 mL deionized water into the coating system, and stirring for 5 min to obtain the coating emulsion.
Preparing a coated fertilizer:
the prepared coating emulsion and fertilizer core particles (urea or compound fertilizer) are used together to prepare the coated fertilizer by a fluidized bed coating machine.
The invention uses nano SiO through water dispersion2The modified water-based polyacrylate emulsion is used as a coating polymer main body, and the water-based polymer coated controlled-release fertilizer produced by the invention is environment-friendly and has good controlled-release effect, the initial dissolution rate is 3.6%, and the 7-day cumulative release rate is 11.3%.
FIG. 1 Water Dispersion of Nano SiO2Impact on cumulative release characteristics of water-based polyacrylate coated fertilizers. C is coated urea prepared from water-based polyacrylate emulsion, and C-Nano (0.5%) is water-dispersed Nano SiO with 0.5%2The coated urea prepared from modified water-based polyacrylate emulsion has C-Nano (1.5%) dispersed with 1.5% water2The coated urea is prepared by modifying water-based polyacrylate emulsion.
The method for measuring the nutrient cumulative release curve comprises the following steps: randomly selecting complete-particle coated fertilizers from the sealed and stored coated fertilizers, repeating the treatment for 3 times and repeating the treatment for 5g each time, accurately weighing the repeated coated fertilizers (accurately to two decimal places), placing the weighed coated fertilizers in a wide-mouth bottle (sealed by a rubber stopper) containing 100ml of deionized water, placing the wide-mouth bottle in an incubator at 25 ℃, and sampling at regular intervals. After each sampling, all the leachate in the jar was poured out, and 100ml of deionized water was added again to continue the culture at 25 ℃. The urea is measured on a flow analyzer by adopting a p-dimethylaminobenzaldehyde colorimetric method.
Drawings
FIG. 1 is water-dispersed nano SiO2Graph of the effect on cumulative release characteristics of water-based polyacrylate coated fertilizers.
Wherein, C is coated urea prepared from water-based polyacrylate emulsion, and C-Nano (0.5%) is water-dispersed Nano SiO with 0.5%2The coated urea prepared from modified water-based polyacrylate emulsion has C-Nano (1.5%) dispersed with 1.5% water2The coated urea is prepared by modifying water-based polyacrylate emulsion.
Detailed Description
Example 1, controlled release fertilizer based on water-based polyacrylate coating:
a. preparation of water-based polyacrylate emulsion: 4.12g of sodium dodecyl benzene sulfonate, OP-108.24 g of emulsifier and 250ml of deionized water were placed in a 1L round bottom three-necked flask and stirred to form a homogeneous aqueous phase. Then, 110g of butyl acrylate, 90 g of methyl methacrylate and 5g of methacrylic acid were mixed to form an oil phase. Adding the oil phase into the water phase, and continuously stirring for 30min to form a pre-emulsion. Pouring 75% of the pre-emulsion from the three-mouth bottle, turning on the electric heating sleeve, and after the reaction temperature rises to 85 ℃, dividing the initiator solution (50 ml, 0.68 g of potassium persulfate) and the pre-emulsion poured from the three-mouth bottle into four parts and sequentially and alternately adding the four parts into the reaction system, wherein the stirring speed of 200rpm is maintained in the whole process. After the pre-emulsion and the initiator solution are added, the system is kept at 85 ℃ to continue the reaction for 3 hours. And finally, closing the electric heating sleeve, and discharging the emulsion through a 200-mesh screen when the temperature of the system is reduced to below 40 ℃. To prepare the water-based polyacrylate emulsion mother liquor.
b. Preparing coating emulsion: the solid content of the water-based polyacrylate emulsion prepared in the step a is about 40.7%, and the water-based polyacrylate traditional emulsion with dry matter accounting for 10% of the mass of the fertilizer core particles is used as a material for preparing the coated fertilizer. 98.28g of the water-based polyacrylate traditional emulsion mother liquor is weighed, mixed with 100mL of deionized water and stirred for 5 minutes to prepare the coating emulsion.
c. Preparing a coated fertilizer: granular fertilizer and coating emulsion are placed in a fluid bed coating apparatus using a small fluid bed coating apparatus, such as the LDP-3 fluid bed coating apparatus manufactured by the dichromatic dryer plant of dichroa febrifuga. In the process of fluidized bed coating, coating parameters such as flow rate of coating liquid, air inlet temperature, atomization pressure and the like are properly adjusted according to the property of coating emulsion, so that the water volatilization speed in the coating process is consistent with the film forming speed, and coating failure caused by film forming is avoided. One coating process is completed in about 1.5-2 hours. The main control parameter ranges for fluidized bed coating are as follows:
coating emulsion flow rate: 1 rpm
Air inlet temperature: 50 deg.C
Air outlet temperature: 40 deg.C
Atomization pressure: 0.12 Mpa
The prepared coated fertilizer is water-based poly emulsion coated fertilizer with the serial number of C. The release pattern is shown by curve C in figure 1. the release rate of the fertilizer is about 24.9% after 1 day of release in deionized water at 25 ℃, and the cumulative release rate reaches 43.5% after 7 days. The controlled release fertilizer has a certain controlled release effect, has certain compatibility with the nutrient requirement type of plants, but has high primary dissolution rate, and is mixed with a quick-acting fertilizer to be used as a controlled release BB fertilizer to be applied to field production, so that the seedling burning phenomenon is easily caused, and the nutrient release rate needs to be further slowed down.
Example 2 aqueous dispersion based on nanosilicon dioxide2Modified water-based polyacrylate coated fertilizers:
a. preparation of water-based polyacrylate emulsion: 4.12g of sodium dodecyl benzene sulfonate, OP-108.24 g of emulsifier and 250ml of deionized water were placed in a 1L round bottom three-necked flask and stirred to form a homogeneous aqueous phase. Then, 110g of butyl acrylate, 90 g of methyl methacrylate and 5g of methacrylic acid were mixed to form an oil phase. Adding the oil phase into the water phase, and continuously stirring for 30min to form a pre-emulsion. Pouring 75% of the pre-emulsion from the three-necked flask, turning on the electric heating mantle, waiting until the reaction temperature has risen to 85 ℃, and adding the initiator solution (50 mL, 0.013 g/mL K)2S2O8) And the pre-emulsion poured out of the three-mouth bottle is divided into four parts and sequentially and alternately added into the reaction system, and the stirring speed of 200rpm is maintained in the whole process. After the pre-emulsion and the initiator solution are added, the system is kept at 85 ℃ to continue the reaction for 3 hours. Most preferablyThen the electric heating jacket is closed, and when the temperature of the system is reduced to below 40 ℃, the emulsion is discharged through a 200-mesh screen. To prepare the water-based polyacrylate emulsion mother liquor.
b. Preparing coating emulsion: the solid content of the water-based polyacrylate emulsion prepared in the step a is about 40.7%, and the water-based polyacrylate emulsion with dry matter accounting for 10% of the mass of the fertilizer core particles is used as a material for preparing the coated fertilizer. Weighing 98.28g of water-based polyacrylate emulsion mother liquor, and then weighing water-dispersed nano SiO 0.5 percent of water-based polyacrylate dry matter20.66 g of dispersion (30%) was added to the water-based polyacrylate emulsion, and finally 100mL of deionized water was added and stirred for 5 minutes to obtain a coating emulsion.
c. Preparing a coated fertilizer: and (c) putting the granular urea and the coating emulsion prepared in the step b into a fluidized bed coating device by using a small fluidized bed coating device. The procedure and parameter settings for fluid bed coating were the same as in example 1.
The prepared coated fertilizer is 0.5 percent of water dispersible nano SiO2The release mode of the modified water-based polyacrylate coated urea is shown in a C-Nano (0.5%) curve in figure 1, the release rate of the modified water-based polyacrylate coated urea is about 3.6% after the modified water-based polyacrylate coated urea is released in deionized water at 25 ℃ for 1 day, and the cumulative release rate reaches 11.3% after 7 days, so that an excellent controlled release effect is shown. Compared with unmodified water-based polyacrylate coated fertilizer, nano SiO is dispersed by 0.5 percent of water2The modified water-based polyacrylate coated urea has obviously slowed nutrient release rate, the initial dissolution rate is reduced from unmodified 24.9% to 3.6%, and the 7-day cumulative release rate is reduced from unmodified 41.5% to 11.3%. Thus dispersing the nano SiO with 0.5% water2The modified water-based polyacrylate coated urea and the quick-acting fertilizer are not easy to cause seedling burning when applied in a controlled release BB fertilizer mode, in addition, the mechanical strength of the polymer coating is increased, the coated fertilizer is not easy to break due to external disturbance after being applied, and the coated fertilizer is more easily matched with the nutrient requirement of crops.
Example 3 aqueous dispersion based on nanosilicon2Modified water-based polyacrylate coated fertilizers:
a. preparation of water-based polyacrylate emulsion: the preparation process and formulation of the water-based polyacrylate emulsion were the same as in example 1.
b. Preparing coating emulsion: the solid content of the water-based polyacrylate emulsion prepared in the step a is about 40.7%, and the water-based polyacrylate emulsion with dry matter accounting for 10% of the mass of the fertilizer core particles is used as a material for preparing the coated fertilizer. Weighing 98.28g of water-based polyacrylate emulsion mother liquor, and then weighing water-dispersed nano SiO accounting for 1.5 percent of the water-based polyacrylate21.98 g of the dispersion (30%) was added to the water-based polyacrylate emulsion, and finally 100mL of deionized water was added thereto, followed by stirring for 5 minutes to obtain a coating emulsion.
c. Preparing a coated fertilizer: and (c) putting the granular urea and the coating emulsion prepared in the step b into a fluidized bed coating device by using a small fluidized bed coating device. The procedure and parameter settings for fluid bed coating were the same as in example 1.
The prepared coated fertilizer is 1.5 percent of water dispersible nano SiO2The release pattern of the modified water-based polyacrylate coated urea is shown in a C-Nano (1.5%) curve in figure 1, the release rate of the modified water-based polyacrylate coated urea is about 14.3% after the modified water-based polyacrylate coated urea is released in deionized water at 25 ℃ for 1 day, and the cumulative release rate reaches 32.8% after 7 days, so that the modified water-based polyacrylate coated urea shows an excellent controlled release effect. Compared with unmodified water-based polyacrylate coated fertilizer, 1.5 percent of water is used for dispersing nano SiO2The modified water-based polyacrylate coated urea has slow nutrient release rate, the initial dissolution rate is reduced from unmodified 24.9 percent to 14.3 percent, and the 7-day cumulative release rate is reduced from unmodified 41.5 percent to 32.8 percent. Dispersion of the SiO nanoparticles in 1.5% Water2Although the nutrient release of the coated urea is reduced by the modified water-based polyacrylate, the reduction range is far less than that of the nano SiO dispersed by 0.5 percent water2The modification effect of (3). Because the nano SiO is dispersed by water2After the water-based polyacrylate is modified, the adhesive force between the polymer and the surface of the fertilizer and the strength of the polymer are improved. But in the original water-based polyacrylate emulsion system, the dosage of the surfactant is certain, and excessive water is added to disperse the nano SiO2Then a part of nano SiO is generated2And the aggregates are aggregated in a new system, and the aggregation causes heterogeneity of the composite membrane, and finally influences the nutrient controlled release effect of the composite membrane. Thus, the water-dispersed nano SiO used for modification can be seen2The amount of (c) is a key factor in the success of the modification.
Has the advantages that:
FIG. 1 shows that the water is dispersed with nano SiO2After the water-based polyacrylate emulsion is modified, the nutrient release rate of the coated urea is effectively controlled. Compared with unmodified water-based polyacrylate emulsion, 0.5 percent of water is dispersed with nano SiO2The initial dissolution rate of the modified water-based polyacrylate coated urea is reduced from unmodified 24.9 percent to 3.6 percent, the 7-day cumulative release rate is reduced from unmodified 41.5 percent to 11.3 percent, and 1.5 percent of water is dispersed with nano SiO2The initial dissolution rate of the modified water-based polyacrylate coated urea is reduced from unmodified 24.9 percent to 14.3 percent, and the 7-day cumulative release rate is reduced from unmodified 41.5 percent to 32.8 percent. Dispersing nano SiO with water2After the water-based polyacrylate is modified, the adhesive force between the polymer and the surface of the fertilizer and the strength of the polymer are improved. The concrete expression is that the initial dissolution rate of the water-based polyacrylate coated fertilizer is reduced, and the release of nutrients is slowed down. But with the addition of water-based polyacrylate emulsion system water-dispersed nano SiO2The content of the system surfactant is constant, and part of the nano SiO is increased continuously2And the aggregates are aggregated in a new system, and the aggregation causes heterogeneity of the composite membrane, and finally influences the nutrient controlled release effect of the composite membrane.
Claims (3)
1. Water-dispersion-based nano SiO2The modified water-based polyacrylate coated fertilizer consists of fertilizer core particles and a high polymer coating outside the fertilizer core particles, and is characterized in that the high polymer coating is water-dispersed nano SiO2Modified water-based polyacrylate emulsion; the mass of the dry matter of the polymer coating material accounts for 5-15% of the mass of the fertilizer core particles;
the water-dispersed nano SiO2The modified water-based polyacrylate emulsion comprises the following raw materials in percentage by mass: 80-120 g of butyl acrylate, 80-120 g of methyl methacrylate, 3-7 g of methacrylic acid, 0.68 g of potassium persulfate, 3.09-5.15 g of sodium dodecyl benzene sulfonate and 10.30 g of OP-106.18, and is prepared by semi-continuous emulsion polymerization; water dispersible nano SiO2Water-based polyacrylic acid0.1-2.5% of ester dry matter.
2. The water-dispersible nano-SiO based on claim 12The modified water-based polyacrylate coated fertilizer is characterized in that the water-dispersed nano SiO2The modified water-based polyacrylate emulsion comprises the following raw materials in percentage by mass:
110g of butyl acrylate, 90 g of methyl methacrylate, 5g of methacrylic acid, 4.12g of sodium dodecyl benzene sulfonate, OP-108.24 g, 0.68 g of potassium persulfate and 250g of water; wherein, the nano SiO is dispersed in water20.5 wt% of the water-based polyacrylate dry matter.
3. The water-dispersible nano SiO of claim 12The preparation method of the modified water-based polyacrylate coated fertilizer is characterized by comprising three parts of preparation of water-based polyacrylate emulsion, preparation of coating emulsion and preparation of the coated fertilizer:
wherein, the preparation of the water-based polyacrylate emulsion comprises the following steps:
⑴, dissolving emulsifier sodium dodecyl benzene sulfonate and OP-10 in deionized water, and stirring to form uniform water phase;
⑵, mixing the butyl acrylate, the methyl methacrylate and the methacrylic acid to form an oil phase;
⑶, adding the oil phase obtained in the step ⑵ into the water phase obtained in the step ⑴, and continuously stirring for 30min to obtain a pre-emulsion;
⑷, pouring 75% of the pre-emulsion obtained in step ⑶ from a three-mouth bottle, opening an electric heating sleeve, dividing the initiator solution and the pre-emulsion poured from the three-mouth bottle into four parts after the reaction temperature rises to 85 ℃, sequentially and alternately adding the four parts, keeping the stirring speed at 200rpm in the whole process, keeping the temperature of the system at 85 ℃ for continuous reaction for 3 hours after the pre-emulsion and the initiator solution are added, finally closing the electric heating sleeve, and discharging the emulsion through a 200-mesh screen when the temperature of the system drops to below 40 ℃ to obtain the water-based polyacrylate emulsion;
preparing a coating emulsion:
in the prepared prior artOn the basis of the water-based polyacrylate emulsion with solid content, selecting the water-based polyacrylate emulsion with dry matter accounting for 5-15% of the mass of the fertilizer core particles according to the requirement of the actual nutrient controlled release period; then, dispersing water which accounts for 0.1-2.5% of the dry matter of the water-based polyacrylate to form nano SiO2Adding the mixture into water-based polyacrylate emulsion, finally adding 50-250 mL of deionized water into a coating system, and stirring for 5 minutes to obtain coating emulsion;
preparing a coated fertilizer:
preparing a coated fertilizer by using the prepared coating emulsion and the fertilizer core particles together by using a fluidized bed coating machine;
the initiator solution described in step ⑷ was 50ml, 0.68 g of potassium persulfate.
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| CN111517873B (en) * | 2020-04-02 | 2022-11-01 | 北部湾大学 | Controlled-release fertilizer coating agent and preparation method thereof, controlled-release fertilizer and application thereof |
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| 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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| CN101875584A (en) * | 2010-04-27 | 2010-11-03 | 中国科学院南京土壤研究所 | Water-based polymer coated controlled release fertilizer and method for preparing same |
| CN104788191A (en) * | 2015-04-13 | 2015-07-22 | 北京信大虹影环保工程有限公司 | Compound fertilizer with super-high water retention and drought resistance, and preparation method for compound fertilizer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182269A (en) * | 2007-12-03 | 2008-05-21 | 中国农业大学 | Water polymer integument and method for preparing integument controlled-release fertilizer thereof |
| CN101823917A (en) * | 2010-04-27 | 2010-09-08 | 中国科学院南京土壤研究所 | Polymer coated controlled release fertilizer based on water-based reaction for forming films and preparation method thereof |
| CN101875584A (en) * | 2010-04-27 | 2010-11-03 | 中国科学院南京土壤研究所 | Water-based polymer coated controlled release fertilizer and method for preparing same |
| CN104788191A (en) * | 2015-04-13 | 2015-07-22 | 北京信大虹影环保工程有限公司 | Compound fertilizer with super-high water retention and drought resistance, and preparation method for compound fertilizer |
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