CN101367684B - Heat convertible resin coating complex fertilizer - Google Patents
Heat convertible resin coating complex fertilizer Download PDFInfo
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Abstract
The invention discloses a coated mixed fertilizer of hot setting resin, which is manufactured with the following technologies: preheating fertilizer particles in a granulator; adding PAPI and a vegetable oil curing agent thereof onto the fertilizer particles; solidifying and forming a layer of coat; heating; adding epoxide resin and a curing agent thereof onto the moving fertilizer particles; solidifying to smooth and compact coat; manufacturing the needed coated mixed fertilizer of hot setting resin. The controlled release fertilizer has good controlled release performance, which has obvious production and benefit increasing effect and extensive application foreground.
Description
Technical field
The invention belongs to the Chemicals field, specifically relate to a kind of heat convertible resin coating complex fertilizer product.
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 compound fertilizer just seems even more important.Exploitation slowly-releasing, controlled-releasing compounding fertilizer improve the fertile utilization ratio of compound, 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 compound fertilizer product of one.The appearance of the compound compound fertilizer of novel controlled release can not only improve the fertile utilization ratio of compound, guarantees grain security, reduces environmental pollution, has also satisfied peasant's actual demand.
Coated release-controlled compound 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; prolong or the release of control compound fertilizer nutrient, make the supply of soil nutrient and crop need fertilizer to require the novel compound fertilizer formulation of coordinating.From the nutritive element kind of coated release-controlled compound 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.The kind of coated release-controlled compound fertilizer, divide from coated fertilizer, can be divided into inorganics coating complex fertilizer and organic polymer coating complex fertilizer, the former majority is with inorganic composite mixed fertilizer that contains certain nutrient or soil conditioner and so on material, and latter's bag generally comprises thermoplastic resin membrane wrapping control-releasing fertilizer and thermohardening resin coated controlled-release fertilizer two classes.
At present, the research of coating controlled-release fertilizer has both at home and abroad developed into a higher height, and Technology reaches its maturity, and the nutrient controlled release properties is good, and the problem that production cost is high has obtained preliminary solution.Thermohardening resin coated controlled-release compound (mixing) fertilizer has a bottleneck technically, (application number: 95117522.X) patent of U.S. Lesco, Inc " adopts the controlled release compound fertilizer and the method for making of epoxy polymer undercoat " distinct disadvantage as publication number CN1130612, the epoxy polymer coating is used in this invention, come film-forming with amine curing agent, in the processing process, be easy to compound (mixing) compound fertilizer in potassium ion and other salinity react, emit a large amount of ammonias, on the one hand epoxy polymer is difficult at the compound fertilizer granule surface cure, on the other hand, the volatilization of ammonia can cause nitrogen loss again and to the pollution of Working environment.Chinese patent CN1246264C has announced that with the spraying fusing urea be that the method for undercoat prepares the epoxy resin integument controlled-releasing compounding fertilizer, this invention has solved Resins, epoxy and has been difficult to wrap up compound (mixing) fertile problem, but also there is certain defective, promptly use the simple device urine to be difficult to spraying evenly, reach perfect parcel effect and then must use than complex apparatus and operating procedure.
Summary of the invention
At the deficiencies in the prior art, the purpose of this invention is to provide a kind of thermohardening resin coated controlled-release compound fertilizer, improve crop quality, improve the fertile utilization ratio of compound, less agricultural pollution is beneficial to the Sustainable development of agricultural.
Heat convertible resin coating complex fertilizer of the present invention, compound fertilizer granule nuclear core, poly methylene poly phenyl poly isocyanate rete and Resins, epoxy rete by particle size range 1.0-5.0mm constitute, total coating rate 3-16%wt, the controlled release phase is 1-12 month, is to adopt following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 55-60 ℃,
(2) mixed solution that poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof are prepared by mass ratio 1.5-3:1 is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for the 0.5-1.2% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
(3) be warming up to 70-80 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio 10:0.8-1.0 is added on the compound fertilizer granule of motion, the consumption of Resins, epoxy accounts for the 0.9-1.2% of the fertile quality of compound, Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
According to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
In preferred scheme, described heat convertible resin coating complex fertilizer, compound fertilizer granule nuclear core, poly methylene poly phenyl poly isocyanate rete and Resins, epoxy rete by particle size range 1.0-5.0mm constitute, total coating rate 3-16%wt, the controlled release phase is 1-12 month, is to adopt following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 58-60 ℃,
(2) mixed solution that poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof are prepared by mass ratio 2-3:1 is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for the 0.6-1.0% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
(3) be warming up to 75-80 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio 10:0.9-1.0 is added on the compound fertilizer granule of motion, the consumption of Resins, epoxy accounts for the 0.9-1.0% of the fertile quality of compound, Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
According to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
In more preferred scheme, described heat convertible resin coating complex fertilizer, compound fertilizer granule nuclear core, poly methylene poly phenyl poly isocyanate rete and Resins, epoxy rete by particle size range 1.0-5.0mm constitute, the total coating rate of this heat convertible resin coating complex fertilizer 3-16%wt, the controlled release phase is 1-12 month, is to adopt following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 58 ℃,
(2) mixed solution that poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof are prepared by mass ratio 2:1 is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for 1.0% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
(3) heat temperature raising to 78 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio 10:0.9 is added on the compound fertilizer granule of motion, the consumption of Resins, epoxy accounts for 1.0% of the fertile quality of compound, Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
(4) according to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
The vegetables oil solidifying agent of described poly methylene poly phenyl poly isocyanate is the conventional raw material in this area, preferentially selects tung oil, soya-bean oil, oleum lini.Described curing agent for epoxy resin is the conventional raw material in this area, preferentially selects epoxy curing agent T-31, polyethylene polyamine, triethylene tetramine or its mixture.
Heat convertible resin coating complex fertilizer of the present invention, its compound fertilizer granule nuclear core can be selected from ammonium nitrate, ammonium sulfate, diammonium phosphate, bicarbonate of ammonia, primary ammonium phosphate, vitriolate of tartar, Repone K, nitrophosphate fertilizer or other particles compound (mixing) compound fertilizer, also can select little fertilizer such as particle sal epsom, manganous sulfate, zinc sulfate, boron grain for use.
In preferred scheme, heat convertible resin coating complex fertilizer of the present invention can use pigment, and making its outward appearance is green, yellow or orange or other colors.
Thermohardening resin coated controlled-release fertilizer of the present invention comprises following main points:
1, the nuclear core of described thermohardening resin coated controlled-release fertilizer is selected from ammonium nitrate, ammonium sulfate, diammonium phosphate, bicarbonate of ammonia, primary ammonium phosphate, vitriolate of tartar, Repone K, nitrophosphate fertilizer or other particles compound (mixing) compound fertilizer, also can select little fertilizer such as particle sal epsom, manganous sulfate, zinc sulfate, boron grain for use, its particle size range is 1.0-5.0mm.
2, described thermohardening resin coated controlled-release fertilizer appearance color can be a shades of colour such as green, yellow, orange, and this can realize by adding various pigment.
3, total coating rate of described thermohardening resin coated controlled-release fertilizer is 3-16%wt.
4, the fertilizer releasing period of described thermohardening resin coated controlled-release fertilizer can be 1-12 month.
The unusual effect of heat convertible resin coating complex fertilizer of the present invention is: because the present invention is earlier at compound (mixing) fertile particle surface parcel one deck poly methylene poly phenyl poly isocyanate coating, equipment requirements is simple, need not add other equipment, simple to operate, not only improved the character on composite fertilizer or compound fertilizer granule surface, as: rough, shrinkage pool etc. is arranged, the more important thing is and avoided because Resins, epoxy component when directly contacting with compound compound fertilizer granule, composition in potassium ion and other salt ion and the solidifying agent reacts, cause the Resins, epoxy can not film-forming, and ammonia be emitted and the nitrogen loss that produces.
In addition, the nutrient controlled release phase of product can and be added amendment and regulate according to membrane wrapping thickness, can accurately be controlled at and not wait in 1 month to 12 months, also the product with different release period, different release characteristics can be mixed according to a certain percentage in addition, simulate various crops to nutrient demand, make various special coated controlled release fertilizers, the nutrient release profiles of controlled release fertilizer and crop are matched to the nutrient absorbing curve, reach the purpose of the accurate controlled release of nutrient.This product has carried out a large amount of pot experiments, field test and demonstration on crops such as paddy rice, corn, tobacco, peanut, wheat, cotton, strawberry, potato, multiple flowers, vegetables, fruit tree, lawn, test-results shows, this product all has significant volume increase and synergism on above-mentioned crop, have popularizing application prospect very widely.
Description of drawings
Fig. 1 is the product structure synoptic diagram of thermohardening resin coated controlled-release fertilizer.Wherein, the 1st, the Resins, epoxy rete of controlled release fertilizer, the 2nd, the poly methylene poly phenyl poly isocyanate rete of controlled release fertilizer, the 3rd, the fertile nuclear of the compound of controlled release fertilizer core.
Fig. 2 is the nutrient cumulative release graphic representation of 3 months controlled release phases 14-14-14 in 25 ℃ of water.
Fig. 3 is the nutrient cumulative release graphic representation of 9 months controlled release phases 16-44-0 in 25 ℃ of water.
Fig. 4 is the nutrient cumulative release graphic representation of 12 months controlled release phases 12-0-43 in 25 ℃ of water.
Embodiment
Describe technical scheme of the present invention in detail below in conjunction with drawings and Examples, but be not limited thereto.Each embodiment desired raw material is all the commercial goods.This specification sheets is N, P, K content such as " 18-46-0 " implication, belongs to the conventional sign in this area.
The production of the thermohardening resin coated controlled-release fertilizer of 13 months controlled release phases of embodiment.
(1) in granulating disc, the 1000kg diammonium phosphate (18-46-0) that meets particle size range 1.0-5.0mm is preheated to 60 ℃.
(2) 6kg poly methylene poly phenyl poly isocyanate (rising sun chemical industry company limited produces and sells in the Nanjing) and 4kg soya-bean oil are added on the compound fertilizer granule, thermosetting resin finally solidify to form one deck coating in the compound fertilizer granule surface of motion uniform spreading.
(3) heat temperature raising is to 70-80 ℃; 9.25kg Resins, epoxy and 0.75kg epoxy curing agent T-31 (Tianjin Yan Hai chemistry company limited produces and sells) are added on the compound fertilizer granule of motion; thermosetting resin finally is solidified into the coating of smooth densification in the compound fertilizer granule surface of motion uniform spreading.
(4) repeating step makes the thermohardening resin coated controlled-release fertilizer of 3 months controlled release phases for (3) 4 times, total about 5%wt of coating rate.
The production of the thermohardening resin coated controlled-release fertilizer of 2 12 months controlled release phases of embodiment.
(1) in rotary drum, 1000kg saltpetre (13.5-0-45) is preheated to 55 ℃.
(2) 7.5kg poly methylene poly phenyl poly isocyanate and 2.5kg oleum lini are added on the compound fertilizer granule, thermosetting resin finally solidify to form one deck coating in the compound fertilizer granule surface of motion uniform spreading.
(3) heat temperature raising is added to 9.09kg Resins, epoxy and 0.91kg triethylene tetramine on the compound fertilizer granule of motion to 70-80 ℃, and thermosetting resin finally is solidified into the coating of smooth densification in the compound fertilizer granule surface of motion uniform spreading.
(4) repeating step makes the thermohardening resin coated controlled-release fertilizer of 12 months controlled release phases for (3) 6 times, total about 7%wt of coating rate.
The production of the thermohardening resin coated controlled-release fertilizer of 33 months controlled release phases of embodiment.
(1) in granulating disc, the compound fertilizer (phosphoric acid two ammoniums, bicarbonate of ammonia, primary ammonium phosphate, vitriolate of tartar) that meets the 1000kg of particle size range 1.0-5.0mm is preheated to 60 ℃.
(2) 9kg poly methylene poly phenyl poly isocyanate and 3kg tung oil are added on the compound fertilizer granule, thermosetting resin finally solidify to form one deck coating in the compound fertilizer granule surface of motion uniform spreading.
(3) heat temperature raising to 80 ℃, 10kg Resins, epoxy and 1kg polyethylene polyamine (Gutian, Nanjing chemical industry company limited produces and sells) are added on the compound fertilizer granule of motion, thermosetting resin finally is solidified into the coating of smooth densification in the compound fertilizer granule surface of motion uniform spreading.
(4) repeating step makes the thermohardening resin coated controlled-release fertilizer of 3 months controlled release phases for (3) 4 times, total about 6%wt of coating rate.
The production of the thermohardening resin coated controlled-release fertilizer of 4 12 months controlled release phases of embodiment.
(1) in rotary drum, the 1000kg composite fertilizer (sulfur acid magnesium, manganous sulfate, zinc sulfate) that meets particle size range 1.0-5.0mm is preheated to 58 ℃.
(2) 10kg poly methylene poly phenyl poly isocyanate and 5kg oleum lini are added on the compound fertilizer granule, thermosetting resin finally solidify to form one deck coating in the compound fertilizer granule surface of motion uniform spreading.
(3) heat temperature raising to 78 ℃ is added to 10kg Resins, epoxy and 0.9kg triethylene tetramine on the compound fertilizer granule of motion, and thermosetting resin finally is solidified into the coating of smooth densification in the compound fertilizer granule surface of motion uniform spreading.
(4) repeating step makes the thermohardening resin coated controlled-release fertilizer of 12 months controlled release phases for (3) 6 times, total about 8%wt of coating rate.
The test example
The concrete effect of this product is described with biological test below:
(1) corn testing program
Test is located at the Linyi City Luozhuang District, and corn variety is an agricultural university 108.Test design is as follows: 3 levels are established in the fertile fertilising of controlled release, and establish conventional fertilizer application and handle, totally 4 processing, each repeats 3 times (table 1).Institute's compound of executing is fertile to be controlled release Bulk Blending Fertilizer (22-8-15, controlled release nitrogen accounts for 55%, controlled release phosphorus accounts for 43%, controlled release potassium accounts for 23%), use urea (46-0-0), Repone K (0-0-60), controlled release fertilizer (14-14-14), controlled release fertilizer (43-0-0), composite fertilizer (15-15-15) blending make, and contrast to be urea (46-0-0), diammonium phosphate (18-46-0), Repone K (0-0-60).Each sub-district area is 25m
2(long 6m, wide 5m).
Table 1 corn fertilizing scheme
| Handle | N-P 2O 5-K 2O (kg/667m 2) | Rate of fertilizer application (kg/ sub-district) | Remarks |
| CK | 15-5.5-10.2 | Urea 1.05, diammonium phosphate 0.46, Repone K 0.64 | The urea base executes 1/3, and litmus mouth and heading stage respectively impose 1/3, ditches or digs the usefulness of spreading manuer in holes. |
| CRF1 | 15—5.5—10.2 | Corn controlled release Bulk Blending Fertilizer 2.56kg | Do base manure once all the trench digging spread fertilizer over the fields |
| CRF2 | 12.5—4.6—8.5 | Corn controlled release Bulk Blending Fertilizer 2.13kg | Do base manure once all the trench digging spread fertilizer over the fields |
| CRF3 | 11.3—4.1—7.7 | Corn controlled release Bulk Blending Fertilizer 1.92kg | Do base manure once all the trench digging spread fertilizer over the fields |
(2) test-results
Adopt the test-results (table 2) of controlled release Bulk Blending Fertilizer on Linyi City Luozhuang District corn of product preparation of the present invention to show, under the situation of identical nutrient amount of application, controlled release Bulk Blending Fertilizer single fertilization has increased by 36.5% than 3 fertilisings of tradition corn yield, under the situation of nutrient amount of application minimizing 16% and 25%, the controlled release Bulk Blending Fertilizer has increased by 30.5% and 21.6% respectively than traditional fertilization corn yield.
Table 2 Linyi City Luozhuang District corn field test is surveyed and is produced three repetitions of result mean value cartogram (SAS)
* the Duncan multiple comparisons of the average data in same row, all afterbodys indicate the numeric representations of different letters, and there were significant differences (p＜5%) between them.
Has good nutrient controlled release properties from accompanying drawing 2-4 thermohardening resin coated controlled-release fertilizer of the present invention as can be seen.
Thermohardening resin coated controlled-release fertilizer product of the present invention meets the slow controlled-releasing compounding fertilizer HG/T3931-2007 industry standard of the country of playing enforcement on October 1st, 2007, improving crop yield, reducing aspects such as coating controlled-release fertilizer production cost and raising controlled-release effect, obtained outstanding technique effect.In order better on field crop, to apply, can adopt the fertile method of the fertile and common fertile control released BB of compound of controlled release (blending), reach the perfect unity of fertile good nutrient controlled release properties of controlled release and product price.
Claims (6)
1. heat convertible resin coating complex fertilizer, it is characterized in that, examine core, poly methylene poly phenyl poly isocyanate rete and Resins, epoxy rete by the fertiliser granulates of particle size range 1.0-5.0mm and constitute, total coating rate 3-16%wt, the controlled release phase is 1-12 month, is to adopt following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 55-60 ℃,
(2) poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof by mass ratio 1.5-3: 1 mixed solution for preparing is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for the 0.5-1.2% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
The vegetables oil solidifying agent of described poly methylene poly phenyl poly isocyanate is tung oil, soya-bean oil or oleum lini;
(3) be warming up to 70-80 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio 10: 0.8-1.0 is added on the compound fertilizer granule of motion, the consumption of Resins, epoxy accounts for the 0.9-1.2% of the fertile quality of compound, Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
Described curing agent for epoxy resin is epoxy curing agent T-31, polyethylene polyamine, triethylene tetramine or its mixture;
According to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
2. heat convertible resin coating complex fertilizer according to claim 1 is characterized in that, adopts following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 58-60 ℃,
(2) poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof by mass ratio 2-3: 1 mixed solution for preparing is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for the 0.6-1.0% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
(3) be warming up to 75-80 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio 10: 0.9-1.0 is added on the compound fertilizer granule of motion, the consumption of Resins, epoxy accounts for the 0.9-1.0% of the fertile quality of compound, Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
According to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
3. heat convertible resin coating complex fertilizer according to claim 2 is characterized in that, adopts following prepared:
(1) in granulating disc, rotary drum or fluidized-bed, compound fertilizer granule is preheated to 58 ℃,
(2) mixed solution that poly methylene poly phenyl poly isocyanate and vegetables oil solidifying agent thereof are prepared by mass ratio at 2: 1 is added on the compound fertilizer granule, the consumption of poly methylene poly phenyl poly isocyanate accounts for 1.0% of the fertile quality of compound, poly methylene poly phenyl poly isocyanate is in the compound fertilizer granule surface of motion uniform spreading, solidify to form one deck coating
(3) be warming up to 78 ℃, the mixed solution that Resins, epoxy and solidifying agent thereof are prepared by mass ratio at 10: 0.9 is added on the compound fertilizer granule of motion, and the consumption of Resins, epoxy accounts for 1.0% of the fertile quality of compound, and Resins, epoxy is in the compound fertilizer granule surface of motion uniform spreading, be solidified into the coating of smooth densification
According to the demand of controlled release phase, repeating step (3) makes required heat convertible resin coating complex fertilizer.
4. according to the arbitrary described heat convertible resin coating complex fertilizer of claim 1-3, it is characterized in that described fertiliser granulates nuclear core is selected from ammonium nitrate, ammonium sulfate, diammonium phosphate, bicarbonate of ammonia, primary ammonium phosphate, vitriolate of tartar, Repone K, nitrophosphate fertilizer or other particles compound (mixing) fertilizer.
5. according to the arbitrary described heat convertible resin coating complex fertilizer of claim 1-3, it is characterized in that described fertiliser granulates nuclear core is selected from sal epsom, manganous sulfate, zinc sulfate or boron grain.
6. according to the arbitrary described heat convertible resin coating complex fertilizer of claim 1-3, it is characterized in that its outward appearance is green, yellow or orange.
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| CN101985411B (en) * | 2010-11-02 | 2012-10-10 | 湖北富邦科技股份有限公司 | Special environmental-friendly anti-blocking agent for producing urea-based compound fertilizer by high-tower granulation and preparation method thereof |
| CN102320883B (en) * | 2011-06-22 | 2014-08-13 | 冯岁寒 | Polyurethane/epoxy resin compound material coated controlled release fertilizer and preparation method thereof |
| CN110304969A (en) * | 2019-08-13 | 2019-10-08 | 苏建平 | A kind of wheat special controlled release fertilizer, preparation method and its application |
| CN111454097B (en) * | 2020-03-09 | 2022-10-04 | 沃博特生物科技有限公司 | Special double-membrane controlled-release fertilizer for navel oranges and preparation method thereof |
| CN111454098B (en) * | 2020-03-09 | 2022-10-04 | 沃博特生物科技有限公司 | Double-film controlled-release fertilizer coating method |
| CN111454108B (en) * | 2020-03-09 | 2022-10-04 | 沃博特生物科技有限公司 | Special double-film controlled-release fertilizer for grapes and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569773A (en) * | 2004-04-27 | 2005-01-26 | 山东农业大学 | Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat |
| CN101037368A (en) * | 2007-02-12 | 2007-09-19 | 山东省农业科学院土壤肥料研究所 | Biological biodegradable self-control slow-releasing fertilizer and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1569773A (en) * | 2004-04-27 | 2005-01-26 | 山东农业大学 | Modified epoxy resin coated slow-release fertilizer with spray coating urea as bottom coat |
| CN101037368A (en) * | 2007-02-12 | 2007-09-19 | 山东省农业科学院土壤肥料研究所 | Biological biodegradable self-control slow-releasing fertilizer and preparation method thereof |
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