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PH-responsive controlled release pesticide microcapsule suspension and preparation method thereof

A technology of microcapsule suspension and controlled-release pesticide, which is applied in the direction of botany equipment and methods, applications, biocides, etc., can solve the problems of uneven drug effect, achieve stable quality, simple and efficient preparation process, and solve the problem of easy clustering Effect

Inactive Publication Date: 2019-04-30
江苏精禾界面科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adjusts the controlled release rate by adjusting the hydrophobic / hydrophilic effect of the polymer coating. It is acceptable for fertilizers with large particles, but it is easy to cause uneven drug effects when used alone in pesticide preparations.

Method used

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  • PH-responsive controlled release pesticide microcapsule suspension and preparation method thereof
  • PH-responsive controlled release pesticide microcapsule suspension and preparation method thereof
  • PH-responsive controlled release pesticide microcapsule suspension and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 14

[0034] Embodiment 1 40% acetochlor microcapsule suspension

[0035] (1) Weigh 40g of acetochlor, 4g of toluene diisocyanate, 14g of polyurethane soft segment PEA-1000, 2g of dimethylolpropionic acid (DMPA), 0.5g of silicone defoamer, 6g of calcium lignosulfonate, 2g sodium benzoate, 5g glycerol, 2g xanthan gum and the water of surplus (total 100g), standby;

[0036] (2) Preparation of polyurethane prepolymer: Feed toluene diisocyanate and polyurethane soft segment PEA-1000 under anhydrous and oxygen-free conditions, stir and cure at 80°C for 5 hours, and react to obtain polyurethane prepolymer;

[0037] (3) Prepare the dispersed phase: mix the weighed acetochlor and the polyurethane soft segment prepolymer, stir evenly at 50° C., and prepare the dispersed phase;

[0038] (4) Prepare the continuous phase: mix and stir the weighed calcium lignosulfonate, dimethylolpropionic acid, silicone defoamer and water evenly to prepare the continuous phase;

[0039] (5) Preparation of micr...

Embodiment 2

[0045] The amount of dimethylolpropionic acid in embodiment 1 is adjusted to 3g, and other operating steps and technical parameters are the same as in embodiment 1.

Embodiment 3

[0047] The amount of dimethylolpropionic acid in embodiment 1 is adjusted to 5g, and other operating steps and technical parameters are the same as in embodiment 1.

[0048] The performance indicators of the microcapsule suspension prepared in Examples 1-3 were tested respectively, and the test results are shown in Table 1.

[0049] Table 1

[0050]

[0051]

[0052] As can be seen from the above table, the microcapsule suspensions prepared in Examples 1, 2, and 3 have good stability.

[0053] Further, test the release rate of the microcapsule suspension prepared in Example 1-3 at pH 10, weigh 1 g of the microcapsule suspension in Example 1-3, put it into a dialysis bag, and place it at pH 10 In a 50ml conical flask of buffered aqueous solution, at regular intervals (t), pipette 1mL sample solution with a pipette gun, measure its absorbance by ultraviolet spectroscopy, and add an equal amount of buffered aqueous solution to the conical flask, and compare the buffered aq...

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Abstract

The invention discloses a pH-responsive controlled release pesticide microcapsule suspension. The pH-responsive controlled release pesticide microcapsule suspension comprises 1-55 wt% of a capsule core effective component, 2-25 wt% of a capsule material, 0-15 wt% of a capsule core solvent, 2-6 wt% of a dispersant, 0.5-1 wt% of a defoamer, 0.5-2 wt% of a preservative, 3-5 wt% of an antifreeze agent, 0.1-2 wt% of a thickener, and the balance of water, and the capsule material is polyurethane obtained by crosslinking and curing isocyanate, a polyurethane soft segment and a carboxyl group-containing chain extender, and a weight ratio of the isocyanate to the polyurethane soft segment to the carboxyl group-containing chain extender is (10-20):(20-85):(4-30). The invention also discloses a preparation method of the pH-responsive controlled release pesticide microcapsule suspension. The pH-responsive controlled release pesticide microcapsule suspension prepared in the invention has the advantages of simple preparation process, stable quality, high efficiency, and realization of adjustment of the release rate according to different pH values.

Description

technical field [0001] The invention relates to the technical field of pesticide microcapsules, in particular to a pH-responsive controlled-release pesticide microcapsule suspension and a preparation method thereof. Background technique [0002] When pesticides are applied to crops for pest control, generally only 20-30% are utilized, and most of the active ingredients of pesticides will remain in the environment. Pesticide slow-release agent can effectively reduce the loss rate of pesticides and improve the utilization rate of pesticides. At present, there are many sustained-release formulations of pesticides, but the release characteristics are easily affected by the environment, and the environmental stability of the formulations has obvious defects, which in turn affects the actual use effect. If the environment-responsive carrier material is applied to the field of pesticides, research and development of new environment-responsive pesticide controlled-release agents wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N25/04A01N25/10A01N37/26A01N57/16A01N53/08A01N47/24
CPCA01N25/04A01N25/10A01N25/28A01N37/26A01N47/24A01N53/00A01N57/16
Inventor 范文娟王丹王仁飞陆林华周桂东朱光飞石伟山
Owner 江苏精禾界面科技有限公司
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