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CN-122010616-A - PHA-based drug fertilizer molasses compound rapid-start slow-release preparation

CN122010616ACN 122010616 ACN122010616 ACN 122010616ACN-122010616-A

Abstract

The invention discloses a PHA-based pesticide fertilizer molasses compound fast-start slow-release preparation, belongs to the technical field of crop slow-release preparations, and is used for solving the technical problems that NPK nutrient utilization rate, pesticide composition utilization rate, early prevention and control/fertilizer supply efficiency and later prevention and control/fertilizer supply continuity of the crop slow-release preparation in the prior art are to be further improved. The invention constructs a multi-layer composite structure of the dual-functional inner core particles, the PHA-based slow-release layer and the quick-release starting layer, optimizes the composition components of each layer, ensures that the preparation can quickly take effect and stably supply active ingredients for a long time after being applied, obviously improves the pesticide utilization rate and the nutrient absorption efficiency, prolongs the action period, reduces the residual risk and finally realizes the efficient, controllable and environment-friendly synergistic release effect of the pesticide and the fertilizer.

Inventors

  • ZHU ZONGLIN
  • ZHU JINLIAN
  • WEI RONGXIANG
  • WANG QIANGFENG
  • LI JINGJING
  • Wei Shunshuai
  • ZHAO KANGWEI
  • YANG JIHENG
  • JIANG TINGCHEN
  • Mao Zhiji
  • HUANG YIAN

Assignees

  • 广西金丝鸟农化有限公司

Dates

Publication Date
20260512
Application Date
20260120

Claims (9)

  1. 1. The PHA-based pesticide fertilizer molasses compound quick-start slow-release preparation is characterized by comprising difunctional core particles, a PHA-based slow-release layer and a quick-release start layer which are sequentially arranged from inside to outside; The dual-functional kernel granule comprises, by weight, 40-50 parts of nutrient elements, 5-10 parts of kernel pesticides, 15-25 parts of HMC modified kaolin and 3-5 parts of binders; the thickness of the PHA-based slow release layer is 100-200 mu m; The quick release starting layer comprises, by weight, 50-60 parts of molasses, 8-15 parts of an outer pesticide, 10-20 parts of quick-acting nutrient elements, and a thickness of 60-120 mu m.
  2. 2. The PHA-based drug fertilizer molasses compound rapid-start slow-release preparation is characterized in that the nutritional elements comprise urea, monoammonium phosphate, potassium sulfate, boric acid, zinc sulfate and EDTA-iron in a weight ratio of 10-15:12-16:10-15:0.5-0.8:1-1.5:0.6-0.8, the inner core pesticide comprises any one or more of herbicide, bactericide and pesticide, the herbicide is one or two of glyphosate and nicosulfuron, the bactericide is one or two of carbendazim and azoxystrobin, and the pesticide is one or two of imidacloprid and chlorantraniliprole.
  3. 3. The PHA-based drug fertilizer molasses compound rapid-onset and slow-release preparation as claimed in claim 1, wherein the PHA-based slow-release layer comprises 65-75 parts by weight of PHA, 35-45 parts by weight of PBAT, 10-15 parts by weight of hydroxypropyl starch and 8-10 parts by weight of montmorillonite.
  4. 4. The PHA-based pesticide fertilizer molasses compound fast-start slow-release preparation is characterized in that the outer pesticide composition is any one or more of herbicide, bactericide and pesticide, the herbicide is one or two mixtures of glyphosate and nicosulfuron, the bactericide is one or two mixtures of carbendazim and azoxystrobin, the pesticide is one or two mixtures of imidacloprid and chlorantraniliprole, and the quick-acting nutrient elements are composed of ammonium sulfate, monopotassium phosphate and potassium chloride according to a weight ratio of 6-8:6-8:3-4.
  5. 5. The PHA-based medical fertilizer molasses compound quick-start slow-release preparation is characterized in that the preparation method of the HMC-modified kaolin is characterized in that hydroxymethyl cellulose and N, N-dimethylformamide are mixed and stirred until the system is dissolved under the protection of inert gas atmosphere, the isocyanatopropyl triethoxysilane and the activated kaolin are added into a reaction system, the reaction system is heated to 60-70 ℃, the reaction is kept for 30-50min, alkali liquor is added into the reaction system, the reaction is kept for 40-60min, and the HMC-modified kaolin is obtained after the post treatment.
  6. 6. The PHA-based medical fertilizer molasses compound quick-start slow-release preparation according to claim 5, wherein the dosage ratio of the hydroxymethyl cellulose to the N, N-dimethylformamide to the isocyanatopropyltriethoxysilane to the activated kaolin to the alkali lye is 3-4g to 50mL to 0.9-1.2g to 5-6g to 5mL, the alkali lye is 2-3mol/L sodium hydroxide solution, the post-treatment comprises the steps of cooling the reaction system to room temperature after the reaction is completed, adding absolute ethyl alcohol into the reaction system, stirring and dispersing for 30-50min, suction filtering, washing the filter cake with 80vol% ethanol water solution for 3 times, then pumping, transferring the filter cake into a drying box with the temperature of 60-70 ℃, and drying to constant weight, thus obtaining the HMC modified kaolin.
  7. 7. The PHA-based pharmaceutical fertilizer molasses composite fast-start slow-release formulation of claim 5, wherein the activated kaolin is processed by the steps of: A1, mixing kaolin and sulfuric acid solution, heating a reaction system to 80-90 ℃, preserving heat, stirring for 3-4 hours, and performing aftertreatment to obtain pretreated kaolin; A2, mixing the pretreated kaolin and the activating solution, heating the reaction system to 60-70 ℃, preserving heat, stirring for 2-3h, and performing aftertreatment to obtain the activated kaolin.
  8. 8. The preparation of a composite fast start slow release formulation of PHA-base medical fertilizer and molasses according to claim 7, wherein in the step A1, the solid-to-liquid ratio of the kaolin to sulfuric acid solution is 1:3-5, the sulfuric acid solution consists of 15-20wt% sulfuric acid and sodium dodecyl sulfate according to 50mL:1g, the post treatment comprises the steps of cooling the reaction system to room temperature after the reaction is completed, suction filtering, washing a filter cake with purified water to neutrality, transferring the filter cake to a drying box with the temperature of 70-80 ℃, drying the filter cake to constant weight, grinding the filter cake, sieving the filter cake with a 200-mesh sieve to obtain pretreated kaolin, and in the step A2, the solid-to-liquid ratio of the pretreated kaolin to an activating solution is 1:8-10, the activating solution consists of calcium chloride, magnesium chloride and deionized water according to 2g:1 mL, and the post treatment comprises the steps of cooling the reaction system to room temperature after the reaction is completed, suction filtering, transferring the filter cake to the drying box with purified water to the temperature of 70-80 ℃ after the filter cake is washed to neutrality, and drying the filter cake to constant weight, and obtaining activated kaolin.
  9. 9. The PHA-based drug fertilizer molasses compound rapid-onset slow-release preparation of claim 1, wherein the PHA-based drug fertilizer molasses compound rapid-onset slow-release preparation is prepared by the following steps: S1, adding nutrient elements, pesticide components, HMC modified kaolin and a binder into a mixer, mixing for 15-20min to obtain a mixed base material, adding deionized water into the mixer, mixing for 8-10min, and putting the mixed base material into a granulator for granulation to obtain the dual-function inner core particles with the particle size of 2-5 mm; S2, mixing PHA, PBAT, an emulsifier and ethanol, heating a reaction system to 50-60 ℃, stirring and dispersing for 20-30min, adding mixed slurry consisting of hydroxypropyl starch, montmorillonite and deionized water into the reaction system, and emulsifying and dispersing for 40-50min to obtain coating liquid; mixing molasses, pesticide composition, quick-acting nutrient elements, emulsifying agent and deionized water, emulsifying and dispersing for 10-15min to obtain a honeyed suspension; S3, placing the difunctional inner core particles in a fluidized bed coating machine, spraying the coating liquid into the fluidized bed coating machine in an atomization mode, drying for 15-20min after spraying, forming a PHA (polyhydroxyalkanoate) -based slow-release coating outside the difunctional inner core particles, spraying the honey-based suspension into the fluidized bed coating machine in an atomization mode, drying until the moisture is lower than 3%, and forming a quick-release starting layer coating on the PHA-based slow-release coating to obtain the PHA-based drug fertilizer molasses compound quick-start slow-release preparation.

Description

PHA-based drug fertilizer molasses compound rapid-start slow-release preparation Technical Field The invention relates to the technical field of crop slow release preparations, in particular to a PHA (polyhydroxyalkanoate) -based drug fertilizer molasses compound fast start slow release preparation. Background In the current agricultural production, in order to simultaneously meet the nutrient requirements of crop growth and development and the pest/weed control requirements, the production generally needs to apply fertilizers including simple fertilizers, special fertilizers, compound fertilizers and the like and pesticides including pesticides, bactericides, herbicides and the like or adopt simple mixed type pesticide-fertilizer composite preparations of fertilizers and pesticides, and the input mode can give consideration to fertilizer supply and prevention and control to a certain extent, but the problems of high application frequency, high labor intensity, low utilization rate of active ingredients, heavy environmental pressure and the like still commonly exist in practical application, and the comprehensive requirements of green efficient agriculture on reduction and synergy, sustainability and low residue are difficult to meet. At present, the traditional single fertilizer product mainly provides nitrogen, phosphorus, potassium and part of medium trace elements, only has a nutrition supply function, lacks a disease and pest control function, and meanwhile, due to factors such as soil fixation, leaching and volatilization, the utilization rate of the fertilizer is generally low (about 30-40% in production practice), so that the crop absorption efficiency is low and the resource waste is obvious, and the traditional single pesticide product is easy to volatilize, photolyze, hydrolyze, run-off, leaching and the like in a field environment, and is often expressed as short in lasting period, repeated application is needed, and further the environmental pollution risk and the agricultural product residual management and control difficulty are increased; Moreover, most of common pesticide-fertilizer composite preparations are physical mixtures of fertilizers and pesticides or simple co-granulation products, and the general pesticide-fertilizer composite preparations lack structural design aiming at release behaviors, either have quick effect but short duration and insufficient subsequent supply, or have prolonged release period but difficult to meet requirements of nutrition and prevention and control windows quickly, so that nutritional gaps or outbreaks of diseases and insect pests in the seedling stage are caused, and part of slow-release pesticide fertilizers can realize certain slow-release effects, but have unstable release rates, meanwhile, the products are focused on slow-release fertilizer supply/slow-release pesticide supply, systematic design for promoting root growth and improving absorption efficiency is insufficient, the risks of fertilizer supply interruption and weed regeneration easily occur in the plant growth process, and the root vigor, stress resistance and actual nutrient/medicament absorption and utilization of crops are difficult to be obviously improved. In view of the technical drawbacks of this aspect, a solution is now proposed. Disclosure of Invention The invention aims to provide a PHA-based pesticide fertilizer molasses compound fast-start slow-release preparation which is used for solving the technical problems that the NPK nutrient utilization rate, pesticide composition utilization rate, early prevention and control/fertilizer supply efficiency and later prevention and control/fertilizer supply continuity of a crop slow-release preparation in the prior art are to be further improved. The invention aims at realizing the technical scheme that the PHA-based drug fertilizer molasses compound rapid start slow release preparation comprises dual-function inner core particles, a PHA-based slow release layer and a rapid release start layer which are sequentially arranged from inside to outside; The dual-functional kernel granule comprises, by weight, 40-50 parts of nutrient elements, 5-10 parts of kernel pesticides, 15-25 parts of HMC modified kaolin and 3-5 parts of binders; the thickness of the PHA-based slow release layer is 100-200 mu m; The quick release starting layer comprises, by weight, 50-60 parts of molasses, 8-15 parts of an outer pesticide, 10-20 parts of quick-acting nutrient elements, and a thickness of 60-120 mu m. Further, the nutrient elements comprise urea, monoammonium phosphate, potassium sulfate, boric acid, zinc sulfate and EDTA-iron according to the weight ratio of 10-15:12-16:10-15:0.5-0.8:1-1.5:0.6-0.8, the inner core pesticide comprises any one or more of herbicide, bactericide and pesticide, the herbicide is one or two mixtures of glyphosate and nicosulfuron, the bactericide is one or two mixtures of carbendazim and azoxystrobin, and the pesticide is one