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Waterborne polyurethane drug-loaded slow-release spray with opposite charges as well as preparation method and application thereof

A water-based polyurethane, oppositely charged technology, applied in the fields of botanical equipment and methods, applications, chemicals for biological control, etc., can solve the problems of affecting pesticide efficacy, low foliar deposition rate, and easy bouncing of droplets, etc. Achieve the effect of improving the slow release performance of pesticides, increasing the deposition rate, and reducing environmental pollution

Active Publication Date: 2021-01-15
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the low leaf deposition rate caused by droplet bouncing and sliding during pesticide spraying in the prior art, and the addition of additives with complex components leads to complex forces between components, affecting the efficacy of pesticides, etc. problem, providing a water-based polyurethane drug-loaded sustained-release spray with an opposite charge

Method used

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  • Waterborne polyurethane drug-loaded slow-release spray with opposite charges as well as preparation method and application thereof
  • Waterborne polyurethane drug-loaded slow-release spray with opposite charges as well as preparation method and application thereof
  • Waterborne polyurethane drug-loaded slow-release spray with opposite charges as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～24

[0064] This embodiment is anionic water-based polyurethane drug-loaded slow-release emulsion A or cationic water-based polyurethane drug-loaded slow-release emulsion B. According to the formula shown in Table 1, respectively mix diisocyanate and macromolecular polyol according to a certain molar ratio and disperse them uniformly; After the catalyst reacts for 10-60 minutes (the first stage reaction), then add methyl ethyl ketone to dilute, and continue the reaction for 30-50 minutes (the second stage reaction); cool to room temperature, add a neutralizer (alkaline neutralizer neutralizes anionic water-based Polyurethane, acid neutralizer and cationic water-based polyurethane) neutralize for 10-30 minutes; dissolve the hydrophobic pesticide with a small amount of volatile organic solvent, add 8-20% dosage to the reactant and disperse evenly; under strong stirring (500-1000rpm) add water for emulsification for 30-120min, remove methyl ethyl ketone by rotary evaporation, and obta...

Embodiment 25

[0073] This example provides a pesticide spray formulation prepared from an aqueous polyurethane drug-loaded slow-release emulsion with opposite charges, wherein A:B=1:1.

[0074] After the anionic water-based polyurethane drug-loaded slow-release emulsion A prepared in Example 18 and the cationic water-based polyurethane drug-loaded slow-release emulsion B prepared in Example 22 were diluted 15 times with deionized water respectively, according to the volume ratio A:B=1 : 1 mixed spraying, recorded as pesticide spray preparation D&M0.84.

Embodiment 26

[0076] This example provides a pesticide spray formulation prepared from an aqueous polyurethane drug-loaded slow-release emulsion with opposite charges, wherein A:B=1:1.

[0077] After the anionic water-based polyurethane drug-loaded slow-release emulsion A prepared in Example 19 and the cationic water-based polyurethane drug-loaded slow-release emulsion B prepared in Example 23 were diluted 15 times with deionized water respectively, according to the volume ratio A:B=1 :1 mixed spraying, recorded as pesticide spray preparation D&M0.99.

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Abstract

The invention discloses waterborne polyurethane drug-loaded slow-release spray with opposite charges as well as a preparation method and application thereof. The waterborne polyurethane drug-loaded slow-release spray is composed of an anionic waterborne polyurethane drug-loaded sustained-release emulsion A entrapping hydrophobic effective components of a pesticide and a cationic waterborne polyurethane drug-loaded sustained-release emulsion B entrapping hydrophobic effective components of the pesticide. According to the invention, the deposition rate of spray droplets is effectively improved by utilizing the mutual attraction acting force and hydrogen bond interaction between anionic and cationic waterborne polyurethane particles and the reduction effect of the anionic and cationic waterborne polyurethane particles on the surface energy of the droplets; meanwhile, the effective components of the pesticide can be effectively protected, and the slow release performance, rain wash resistance and the like of the pesticide are improved; and the components of the spray are simple and environment-friendly, the spray has good dispersibility and storage stability, and a carrier is safe, non-toxic, less in environmental pollution, safe and efficient.

Description

technical field [0001] The invention relates to the technical field of polymer materials and pesticide slow-release preparations, in particular to a water-based polyurethane drug-loaded slow-release spray with opposite charges, a preparation method and application thereof. Background technique [0002] Pesticides are the most important means of preventing and controlling crop diseases, insect pests and weeds. They are efficient, fast, economical, and simple. They are crucial to crops such as wheat and rice, as well as fruits, vegetables, and trees. Guaranteed production. According to statistics, if the use of pesticides is stopped, the world's annual grain output will drop by 25-30%, and the annual output of vegetables will drop by 40-50%. It can be seen that the status of pesticides in the development of modern agriculture is irreplaceable. [0003] At present, the research on pesticides is mainly focused on improving the utilization rate of pesticides through the slow and...

Claims

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Application Information

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IPC IPC(8): A01N25/06A01N25/10A01N43/90A01N53/08A01N65/24A01P7/00A01P7/04
CPCA01N25/06A01N25/10A01N43/90A01N53/00A01N65/00A01N65/24
Inventor 张超群张怡卢其明罗颖
Owner SOUTH CHINA AGRI UNIV
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