CN100572338C - With the polyethylene film is the water-soluble resin coated controlled release fertilizer and the production technique of undercoat - Google Patents
With the polyethylene film is the water-soluble resin coated controlled release fertilizer and the production technique of undercoat Download PDFInfo
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- CN100572338C CN100572338C CNB2008101396142A CN200810139614A CN100572338C CN 100572338 C CN100572338 C CN 100572338C CN B2008101396142 A CNB2008101396142 A CN B2008101396142A CN 200810139614 A CN200810139614 A CN 200810139614A CN 100572338 C CN100572338 C CN 100572338C
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Abstract
The invention discloses a kind of is the water-soluble resin coated controlled release fertilizer and the production technique thereof of undercoat with the polyethylene film.This controlled release fertilizer is examined core, polyethylene film and water soluble resin rete by fertilizer and is constituted, and fertilizer releasing period is 1-12 month, and it is by following technology manufacturing: (1) preparation coating solution; (2) the fertiliser granulates of finishing polyethylene spraying join rotary drum fluid-bed in, the water soluble resin solution for preparing is uniformly sprayed on the fertiliser granulates of motion, water soluble resin forms coating on the fertiliser granulates surface.This product has not only solved the shortcoming of water-soluble resin coated nutrient controlled release properties difference, and has reduced production cost, very is fit to the trend of development of the present world and domestic fertilizer and environment protection, has extremely vast market prospect.
Description
Technical field
The invention belongs to field of fertilizer production, being specifically related to a kind of is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
Background technology
China's chemical fertilizer consumption amount accounts for the 20-30% of world Fertilizer total quantity consumed, ranks first in the world, and the chemical fertilizer this season utilization ratio average out to 50-60% of developed country, China's chemical fertilizer this season utilization ratio on average only is 30-35%.The loss waste of macronutrient not only brings enormous economic loss to society, but also can cause serious environmental to pollute.At present, along with the continuous increase of fertilizer amount, devote exclusive attention to output and lay equal stress on both quality and quantity at agricultural-food, and the requirement of eco-friendly multiple target down, the modification problem of fertilizer just seems even more important.Exploitation slowly-releasing, release and release control fertilizer improve utilization rate of fertilizer, reduce environmental pollution, are simple measures, are particularly suitable for the national conditions of China.China's chemical fertilizer utilization ratio is lower than one of reason of developed country, is difficult to prove effective in China in the series that developed country the taked technology that applies fertilizers scientifically exactly.China peasant's level of education is low, and peasant household's land area is small and scattered, the planting system complexity, and mechanization degree is low, and the farmingization service system is difficult to set up and put in place, and rational application of fertilizers and other technical measures are difficult to the service that the peasant provides convenience; In addition, in the developed area, be unwilling the time and efforts that in agronomy operation such as topdress, costs a lot of money of peasant.Therefore, be badly in need of a kind ofly collecting rational application of fertilizers, controlled-release technology is the materialization fertilizer product of one.The appearance of novel controlled release compound manure can not only improve utilization rate of fertilizer, guarantees grain security, reduces environmental pollution, has also satisfied peasant's actual demand.
The research of release and release control fertilizer and use the earliest be the U.S..The research and development that 1961 with sulphur was coated fertilizer indicates fertile research of controlled release and the beginning of using, and other country also begins to launch this research on the one hand subsequently.The Japan and the U.S. are being in rank first aspect the research of release and release control fertilizer at present.Enhancing along with people's Environmental awareness, sustained-controll-release fertiliser is classified as by National Program for Medium-to Long-term Scientific and Technological Development (2006-2020) and is first developed theme, about the research report and the patent application of controlled release fertilizer day by day increases, release and release control fertilizer becomes the focus of research once again.
Film-coated controlled release fertilizer is to be core with the granular chemical fertilizer; the top layer applies the inorganic substance or the organic polymer of one deck low water solubility or microsolubility; change the stripping property of chemical fertilizer nutrient, prolongation or control fertilizer nutrient discharge, and make the supply of soil nutrient and the new-type fertilizer formulation that crop needs fertile requirement to coordinate.The kind of film-coated controlled release fertilizer, divide from coated fertilizer, can be divided into inorganics coated fertilizer and organic polymer coated fertilizer, the former majority is with mineral manure that contains certain nutrient or soil conditioner and so on material, and the latter includes organic synthesis thing of organic polymer, low water solubility or insoluble etc. as coated fertilizer.From the nutritive element kind of film-coated controlled release fertilizer, nitrogen, phosphorus, potassium macroelement and some trace elements at the row of research, still, mainly are based on nitrogen, phosphorus, potassium coating chemical fertilizer at present all.Because the production cost of release and release control fertilizer is higher, generally be applied on economic worths such as lawn, the flowers high plant or crop both at home and abroad, along with the reduction of controlled-release fertilizer production cost and the increase of output, the application of controlled release fertilizer on all kinds of crops is the inexorable trend of chemical fertilizer development.
Water-soluble resin coated controlled release fertilizer meets people to environmental protection requirement, but its fancy price has restricted its development and application, in addition, the easy water absorption and swelling of water soluble resin, therefore determined that complete water-soluble resin coated controlled release fertilizer controlled release properties is relatively poor, the controlled release phase is of short duration, can not satisfy the crop whole growth phase to nutrient demand; And the recovery thermoplastic polyethylene is cheap, and the nutrient controlled release properties is good, therefore the two is combined, and reaches the unification of product performance and value, and for improving utilization rate of fertilizer, high yield increases income, and accelerates applying of controlled release fertilizer and has active operation significance.
Summary of the invention
The purpose of this invention is to provide a kind of is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
It is the production technique of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film that two of purpose of the present invention provides a kind of.
The present invention is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, by particle diameter is that the outer water soluble resin rete of fertiliser granulates nuclear core, polyethylene film and polyethylene film of 1.0-5.0mm constitutes, fertilizer releasing period is 1-12 month, is to be made by following method:
(1) polyvinyl resin is dissolved in the organic solvent, under 105-125 ℃, be prepared into coating solution, wherein polyvinyl resin occupies the 1-10% of machine solvent quality, in encapsulation tool, utilize setting off by contrast of 75-115 ℃ of hot gas, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the fertiliser granulates surface and forms rete dry, smooth densification, finishes the spraying of polyethylene coating;
(2) the fertiliser granulates of finishing polyethylene spraying join rotary drum fluid-bed in, feed 45-75 ℃ warm air, rotate rotary drum fluid-bed in, the water soluble resin solution for preparing is uniformly sprayed on the fertiliser granulates of motion, water vapour is taken away by the warm air volatilization, water soluble resin forms coating on the fertiliser granulates surface, and making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, in preferred production decision: the temperature of described step (1) preparation coating solution is 110-120 ℃, the polyvinyl resin consumption is the 1-8% of organic solvent quality, and hot gas temperature is 80-110 ℃ when spraying coating solution in encapsulation tool.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, in the production decision that is more preferably: the temperature of described step (1) preparation coating solution is 115-120 ℃, the polyvinyl resin consumption is the 2-7% of organic solvent quality, and hot gas temperature is 85-105 ℃ when spraying coating solution in encapsulation tool.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and in preferred production decision: the temperature of the described warm air of step (2) is 50-70 ℃.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and in preferred production decision: the described hot gas of step (1) is a nitrogen.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and in preferred production decision: described organic solvent is the mixture of dimethylbenzene and methylene dichloride, the mass ratio of dimethylbenzene and methylene dichloride≤1.5.In another preferred scheme, described organic solvent is the mixture of turps and methylene dichloride, the mass ratio of turps and methylene dichloride≤1.
Aforementioned is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and in preferred production decision: water soluble resin solution described in the step (2) is that the mass concentration of preparation under 90-95 ℃ is the polyvinyl alcohol water solution of 10-15%.In more preferred scheme, the mass concentration of described polyvinyl alcohol water solution is 12%.
The present invention is the production technique of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and step is as follows:
(1) polyvinyl resin is dissolved in the organic solvent, under 105-125 ℃, be prepared into coating solution, wherein polyvinyl resin occupies the 1-10% of machine solvent quality, in encapsulation tool, utilize setting off by contrast of 75～115 ℃ of hot gass, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the fertiliser granulates surface and forms rete dry, smooth densification, finishes the spraying of polyethylene coating;
(2) the fertiliser granulates of finishing polyethylene spraying join rotary drum fluid-bed in, feed 45～75 ℃ warm air, rotate rotary drum fluid-bed in, the water soluble resin solution for preparing is uniformly sprayed on the fertiliser granulates of motion, water vapour is taken away by the warm air volatilization, water soluble resin forms coating on the fertiliser granulates surface, and making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat.
Unusual effect of the present invention is: the present invention uses and reclaims polyvinyl resin production controlled release fertilizer, domestic and international this raw material quantity is very big at present, as various films, green house of vegetables film particularly, be suitable for industrialization production, the product of gained not only cost is low, and the quality of nutrient controlled release and effect are splendid, utilizes simultaneously to reclaim waste or used plastics and can reduce serious day by day white pollution at present.The water soluble resin water-permeable is stronger; easy water absorption and swelling; therefore water soluble resin film nutrient controlled release properties is relatively poor; but have eco-friendly characteristics again simultaneously, in a word, reclaim the combination of thermoplastic polyethylene and water soluble resin; not only solved the shortcoming of water-soluble resin coated nutrient controlled release properties difference; and reduced production cost, and very be fit to the trend of development of the present world and domestic fertilizer and environment protection, have and brilliant market developing prospect.
Description of drawings
Fig. 1 is that controlled release was the nutrient cumulative release curve of water-soluble resin coated controlled release fertilizer 43-0-0 in 25 ℃ of water of undercoat with the polyethylene film in 2 months.
Fig. 2 is that controlled release was the nutrient cumulative release curve of water-soluble resin coated controlled release fertilizer 20-8-10 in 25 ℃ of water of undercoat with the polyethylene film in 6 months.
Embodiment
Describe the technical scheme that the present invention proposes in detail below in conjunction with drawings and Examples, but be not limited thereto.
Embodiment 1, controlled release 1 month be the making of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
19kg is reclaimed polyvinyl resin to be dissolved in 600kg dimethylbenzene and the 400kg methylene dichloride, about 105 ℃, be prepared into coating solution, in membrane wrapping fluidized-bed, add 1000kg urea (2.0-4.75mm), utilize setting off by contrast of hot gas about 75 ℃, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the urea granules surface and forms dry, the rete of smooth densification, after solution all sprays and finishes, finish the spraying of polyethylene coating, the evaporable solvent recovery cycle is utilized, at 90-95 ℃ of following compound concentration 14% polyvinyl alcohol water solution 300kg, rotate rotary drum fluid-bed in the warm air of about 50 ℃ of feedings, on the fertiliser granulates that sprays to motion that the polyvinyl alcohol water solution for preparing is all evenly obtained, making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat, the product cooling, packing warehouse-in, what make controlled release 1 month is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
Embodiment 2, controlled release 3 months be the making of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
10kg is reclaimed polyvinyl resin to be dissolved in 50kg dimethylbenzene and the 950kg methylene dichloride, under 125 ℃, be prepared into coating solution, in membrane wrapping fluidized-bed, add 500kg urea (2.0-4.75mm), utilize setting off by contrast of 115 ℃ of hot nitrogens, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the urea granules surface and forms dry, the rete of smooth densification, after solution all sprays and finishes, finish the spraying of polyethylene coating, the evaporable solvent recovery cycle is utilized, at 90-95 ℃ of following compound concentration 12% polyvinyl alcohol water solution 250kg, rotate rotary drum fluid-bed in the warm air of about 75 ℃ of feedings, on the fertiliser granulates that sprays to motion that the polyvinyl alcohol water solution for preparing is all evenly obtained, making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat, the product cooling, packing warehouse-in, what make controlled release 3 months is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
Embodiment 3, controlled release 6 months be the making of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
30kg is reclaimed polyvinyl resin to be dissolved in 500kg turps and the 500kg methylene dichloride, under 110 ℃, be prepared into coating solution, in membrane wrapping fluidized-bed, add 1000kg diammonium phosphate (2.0-5.0mm), utilize setting off by contrast of 85 ℃ of warm airs, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the urea granules surface and forms dry, the rete of smooth densification, after solution all sprays and finishes, finish the spraying of polyethylene coating, the evaporable solvent recovery cycle is utilized, at 90-95 ℃ of following compound concentration 12% polyvinyl alcohol water solution 333kg, rotate rotary drum fluid-bed in the warm air of 60 ℃ of feedings, on the fertiliser granulates that sprays to motion that the polyvinyl alcohol water solution for preparing is all evenly obtained, making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat, the product cooling, packing warehouse-in, what make controlled release 6 months is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
Embodiment 4, controlled release 9 months be the making of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
40kg is reclaimed polyvinyl resin to be dissolved in 400kg turps and the 600kg methylene dichloride, about 115 ℃, be prepared into coating solution, in membrane wrapping fluidized-bed, add 1000kg lion horse composite fertilizer (15-15-15), utilize setting off by contrast of 105 ℃ of hot gass, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the urea granules surface and forms dry, the rete of smooth densification, after solution all sprays and finishes, finish the spraying of polyethylene coating, the evaporable solvent recovery cycle is utilized, at 90-95 ℃ of following compound concentration 15% polyvinyl alcohol water solution 400kg, rotate rotary drum fluid-bed in the warm air of 60 ℃ of feedings, on the fertiliser granulates that sprays to motion that the polyvinyl alcohol water solution for preparing is all evenly obtained, making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat, the product cooling, packing warehouse-in, what make controlled release 9 months is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
Embodiment 5, controlled release 12 months be the making of the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
100kg recovery polyvinyl resin and 2kg rubber powder are dissolved in 100kg turps and the 900kg methylene dichloride, under 120 ℃, be prepared into coating solution, in membrane wrapping fluidized-bed, add 1000kg urea (2.0-4.75mm), utilize setting off by contrast of 85 ℃ of hot gass, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the urea granules surface and forms dry, the rete of smooth densification, after solution all sprays and finishes, finish the spraying of polyethylene coating, the evaporable solvent recovery cycle is utilized, compound concentration is 10% polyvinyl alcohol water solution 600kg, rotate rotary drum fluid-bed in the warm air of 65 ℃ of feedings, on the fertiliser granulates that sprays to motion that the polyvinyl alcohol water solution for preparing is all evenly obtained, making with the polyethylene film is the water-soluble resin coated controlled release fertilizer of undercoat, the product cooling, packing warehouse-in, what make controlled release 12 months is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film.
The test example
This product is the water-soluble resin coated controlled release fertilizer of undercoat with the polyethylene film, and tool is different from unique quality of like product, with test its concrete technique effect is described below:
(1) rice test scheme
Test is located at Hou Fangwu village, Hedong District Tang He town, Linyi, for try the water rice varieties be in new No. 1, soil is rice soil, controlled release fertilizer is treated to the dedicated release-controlled Bulk Blending Fertilizer (20-5-20 of paddy rice, controlled release nitrogen accounts for 60%), make by the water-soluble resin coated controlled release urea (43-0-0), common urea (46-0-0), diammonium phosphate (18-46-0), Repone K (0-0-60) blending that with the polyethylene film are undercoat; Common fertilizer treatment is urea (46-0-0), diammonium phosphate (18-46-0), Repone K (0-0-60), special controlled release fertilizer for rice is once to apply at rice transplanting previous crops base manure, common fertilizer is used by peasant's custom of applying fertilizer and is divided base manure and topdress, specific practice is, the urea base executes 1/3, tillering phase and long fringe productive phase, respectively impose 1/3, and other fertilizer are turned over to drop back at rice terrace and executed, through raking the soil level fertilizer and mixing with soil.Special-purpose control-release fertilizer is established two Fertilization Level, and controlled release fertilizer 1 is to reduce by 20% consumption than common fertilizer, and controlled release fertilizer 2 is to reduce by 35% consumption than common fertilizer.
(2) test-results
The test-results (table 1) of the dedicated release-controlled Bulk Blending Fertilizer of paddy rice on Hedong District Tang He town, Linyi Hou Fangwu village paddy rice shows, under the situation that reduces by 20% fertilizer amount, controlled release Bulk Blending Fertilizer single fertilization has increased by 21.8% than 3 fertilisings of tradition rice yield, and under the situation of nutrient amount of application minimizing 35%, the controlled release Bulk Blending Fertilizer has increased by 12.5% than 3 fertilisings of tradition rice yields.
Table 1 different fertilization effect assessment
| Handle | Reduce amount of application (%) than common fertilizer | Than common fertilizer stimulation ratio (%) | Effect assessment |
| |
0 | 0 | Utilization rate of fertilizer is low, and suggestion increases fertilizer application frequency or uses new-type fertilizer. |
| Controlled release fertilizer 1 | 20 | 16.8 | Effect of increasing production is good, and input cost is higher, and is time saving and energy saving, can promote. |
| Controlled release fertilizer 2 | 35 | 13.4 | Effect of increasing production is obvious, and less investment is time saving and energy saving, is worthy to be popularized, and recommends. |
Fig. 1 is that controlled release was the water-soluble resin coated controlled release fertilizer 43-0-0 controlled-release compound fertilizer nutrient release profiles of undercoat with the polyethylene film in 2 months.Fig. 2 is that controlled release was the water-soluble resin coated controlled release fertilizer 20-8-10 control release urea nutrient release profiles of undercoat with the polyethylene film in 6 months.Thermoplastic resin membrane wrapping control-releasing fertilizer therefrom of the present invention as can be seen has good deenergized period, has well played controlled-release function.
The present invention is that the water-soluble resin coated controlled release fertilizer product of undercoat meets the national sustained-controll-release fertiliser HG/T 3931-2007 industry standard that played enforcement on October 1st, 2007 with the polyethylene film, improving crop yield, reducing aspects such as coating controlled-release fertilizer production cost and raising controlled-release effect, obtained outstanding technique effect.
Should be pointed out that embodiment is the more representational example of the present invention, obvious technical scheme of the present invention is not limited to the foregoing description, and a lot of distortion can also be arranged.Those of ordinary skill in the art, with the present invention clear and definite disclosed or according to undoubted the obtaining of the written description of file, all should think the claimed scope of this patent.
Claims (10)
1, a kind of is the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that: it is to be that the outer polyvinyl alcohol rete of fertiliser granulates nuclear core, polyethylene film and polyethylene film of 1.0-5.0mm constitutes by particle diameter, fertilizer releasing period is 1-12 month, is to be made by following method:
(1) polyvinyl resin is dissolved in the organic solvent, under 105-125 ℃, be prepared into coating solution, wherein polyvinyl resin occupies the 1-10% of machine solvent quality, in encapsulation tool, utilize setting off by contrast of 75-115 ℃ of hot gas, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the fertiliser granulates surface and forms rete dry, smooth densification, finishes the spraying of polyethylene coating;
(2) the fertiliser granulates of finishing polyethylene spraying join rotary drum fluid-bed in, feed 45-75 ℃ warm air, rotate rotary drum fluid-bed in, the polyvinyl alcohol solution for preparing is uniformly sprayed on the fertiliser granulates of motion, water vapour is taken away by the warm air volatilization, polyvinyl alcohol forms coating on the fertiliser granulates surface, and making with the polyethylene film is the polyvinyl alcohol coating controlled-release fertilizer of undercoat.
2, according to claim 1 is the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that: the temperature of described step (1) preparation coating solution is 110-120 ℃, the polyvinyl resin consumption is the 1-8% of organic solvent quality, and hot gas temperature is 80-110 ℃ when spraying coating solution in encapsulation tool.
3, according to claim 2 is the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that: the temperature of described step (1) preparation coating solution is 115-120 ℃, the polyvinyl resin consumption is the 2-7% of organic solvent quality, and hot gas temperature is 85-105 ℃ when spraying coating solution in encapsulation tool.
4, according to claim 1 is the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that: the temperature of the described warm air of step (2) is 50-70 ℃.
5, according to claim 1-4 arbitrary described be the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that: the described hot gas of step (1) is a nitrogen.
6, according to claim 1-4 arbitrary described be the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that described organic solvent is the mixture of dimethylbenzene and methylene dichloride, the mass ratio of dimethylbenzene and methylene dichloride≤1.5.
7, according to claim 1-4 arbitrary described be the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that described organic solvent is the mixture of turps and methylene dichloride, the mass ratio of turps and methylene dichloride≤1.
8, according to claim 1-4 arbitrary described be the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that, polyvinyl alcohol solution described in the step (2) be 90-95 ℃ down the mass concentration of preparation be the polyvinyl alcohol water solution of 10-15%.
9, according to claim 8 is the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that, the mass concentration of described polyvinyl alcohol water solution is 12%.
10, be the production technique of the polyvinyl alcohol coating controlled-release fertilizer of undercoat with the polyethylene film, it is characterized in that:
(1) polyvinyl resin is dissolved in the organic solvent, under 105-125 ℃, be prepared into coating solution, wherein polyvinyl resin occupies the 1-10% of machine solvent quality, in encapsulation tool, utilize setting off by contrast of 75～115 ℃ of hot gass, the coating solution spraying to fluidizing fertiliser granulates surface, after the solvent evaporates, coated fertilizer is wrapped in the fertiliser granulates surface and forms rete dry, smooth densification, finishes the spraying of polyethylene coating;
(2) the fertiliser granulates of finishing polyethylene spraying join rotary drum fluid-bed in, feed 45～75 ℃ warm air, rotate rotary drum fluid-bed in, the polyvinyl alcohol solution for preparing is uniformly sprayed on the fertiliser granulates of motion, water vapour is taken away by the warm air volatilization, polyvinyl alcohol forms coating on the fertiliser granulates surface, and making with the polyethylene film is the polyvinyl alcohol coating controlled-release fertilizer of undercoat.
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| CA2853300C (en) * | 2011-10-24 | 2018-02-27 | Stamicarbon B.V. | Method of making controlled release fertilizer particles |
| CN103242094B (en) * | 2013-05-16 | 2014-09-24 | 北京市农林科学院 | Fertilizer coating method |
| CN113402323A (en) * | 2021-07-08 | 2021-09-17 | 百色学院 | Special fertilizer for sugarcane primary root zone and preparation process thereof |
| CN114538993A (en) * | 2021-12-31 | 2022-05-27 | 陈思宇 | Method for producing coated controlled-release fertilizer by continuous closed circulation recovery drum process |
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