Polymer-coated controlled release pesticide granule and preparation method thereof

A technology for controlled release of pesticides and polymers, applied in fertilizer mixtures, agriculture, fertilization devices, etc., can solve problems such as short duration of action, difficulty in grasping release patterns, and small drug loads

Active Publication Date: 2013-11-13
BEIJING BOYICHENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic patents only roughly list several types of polymer coating materials for commercial products, lack of research on the molecular design of materials, coating technology and pesticide release characteristics, such as: polymerization methods and conditions (polymerization temperature, stirring speed, feeding sequence, etc.), initiator type and dosage, monomer type, monomer ratio and dosage, film performance, etc.
In addition, there are common problems in adsorbents and uniform agents: small drug loading, short duration of action, and difficulty in grasping release patterns, etc.

Method used

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  • Polymer-coated controlled release pesticide granule and preparation method thereof
  • Polymer-coated controlled release pesticide granule and preparation method thereof
  • Polymer-coated controlled release pesticide granule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Weigh 10 kg of self-made pesticide granules with a particle diameter of 3 mm, place them in the drum, turn on the heating switch of the drum, and preheat the fertilizer until the temperature is constant at 85°C. Weigh 100g of toluene diisocyanate (TDI), add 60g of sulfonated paraffin (film-forming agent), and place it in a heating kettle to melt at a constant temperature of 70°C. Weigh 220g of polyether polyol series (Jingzhou Longhua Petroleum Company Type 635), 20g of 1,6-hexanediol (chain extender), add 0.1g of stannous octoate (catalyst), and place it in a heating kettle to melt at constant temperature 80°C. Then open the vent valve of the proportional pump, and then open the pump inlet valve to mix the two-component liquid through the high-efficiency mixer, adjust the pump pressure to 0.1Mpa, and the total spray rate to 0.075L / min, and start spraying. Spray continuously for 6 minutes, until the coating solution is completely sprayed, after 90°C heat preservation r...

Embodiment 2

[0087] Add 100 parts of deionized water, 0.5 parts of sodium dodecylsulfonate, and 0.5 parts of OP-10 into the reaction kettle, heat, stir, and protect with nitrogen gas. When the temperature rises to 82°C, mix 100 parts of mixed monomers (methyl methacrylate: ethyl acrylate: hydroxyethyl acrylate: butyl methacrylate in a weight ratio of 45:45:7:3), 0.5 parts Ammonium persulfate was added dropwise to the reactor to initiate polymerization. React for 4 hours to obtain an emulsion polymer, which is cooled for use. 1000g of self-made pesticide granules with a diameter of 4mm were loaded into the fluidized bed and heated to 90°C. Spray castor oil on the surface of the self-made pesticide particles, and the thickness of the sprayed castor oil film is about 5 μm. Then, spray the polymer emulsion on the surface of the granular castor oil layer with a two-fluid nozzle at an atomization pressure of 4kpa at a rate of 2g per minute, and remove the water contained in the film layer afte...

Embodiment 3

[0095] Weigh 10 kg of self-made pesticide granules with a particle diameter of 3 mm, place them in the drum, turn on the heating switch of the drum, and preheat the self-made pesticide granules until the temperature is constant at 85°C. Weigh 150g of diphenylmethane diisocyanate (MDI), add 60g of paraffin (film-forming agent), and place it in a heating kettle to melt and keep the temperature at 75°C. Weigh 210g of polybutylene adipate and 20g of 2,3-butanediol (chain extender), and place them in a heating kettle to melt at a constant temperature of 90°C. Then open the vent valve of the proportional pump, and then open the pump inlet valve, so that the two-component liquid is mixed through the high-efficiency mixer, adjust the pressure of the pump to 0.1Mpa, and the total spray rate is 0.15 liters / minute, and start spraying. After continuous spraying for 3 minutes, stop spraying, keep warm at 90°C, react for 8 minutes and then cool down to obtain polyurethane-coated controlled-...

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Abstract

The invention discloses a polymer-coated controlled release pesticide granule and a preparation method thereof. The polymer-coated controlled release pesticide granule comprises a pesticide granule and a polymer layer, wherein the pesticide granule is coated by the polymer layer; the pesticide granule contains one or more effective pesticide components; the polymer layer is a hydrophobic membrane layer and comprises a water-based polyacrylate membrane material or a polyurethane membrane material; the mass of the polymer layer accounts for 3%-15% of the weight of the polymer-coated controlled release pesticide granule. The effective pesticide components are acted on the peripheries of crop roots after the polymer-coated controlled release pesticide granule disclosed by the invention is applied along with a base fertilizer. The polymer-coated controlled release pesticide granule has good prevention and control effects on farmland weeds, soil insects and soil-borne diseases, and the coating material synthesis and preparation process is advanced and the polymer-coated controlled release pesticide granule has good controlled release property. The polymer-coated controlled release pesticide granule provided by the invention has the advantages of pesticide utilization ratio improvement, environment pollution reduction, sustainable development and wide application prospect.

Description

technical field [0001] The invention relates to a polymer-coated controlled-release pesticide granule and a preparation method thereof. Background technique [0002] Pesticides can prevent, eliminate or control diseases, insects, weeds and other harmful organisms that endanger agriculture and forestry, and are an important guarantee for increasing agricultural production and ensuring income. According to the statistics of the Food and Agriculture Organization of the United Nations (FAO), the loss of agricultural products recovered from the use of pesticides to control diseases and insect pests in the world accounts for about 30% of the total grain output. my country is a large agricultural country, but also a populous country. Due to population surge, decrease of arable land, and frequent occurrence of agricultural biological disasters, the contradiction between food supply and demand has become increasingly serious, and food security has been seriously threatened. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/02C05G3/08C05G3/60C05G3/90
Inventor 刘建军
Owner BEIJING BOYICHENG SCI & TECH
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