A water-based polyurethane drug-loaded slow-release spray with opposite charges and its preparation method and application

A technology of water-based polyurethane and opposite charge, which is applied in the direction of botany equipment and methods, applications, chemicals for biological control, etc., and can solve the problems of low leaf deposition rate, affecting the efficacy of pesticides, and easy bouncing of droplets, etc. Achieve the effect of increasing the deposition rate, improving the slow-release performance of pesticides, and the ability to withstand rain erosion

Active Publication Date: 2021-07-20
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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  • A water-based polyurethane drug-loaded slow-release spray with opposite charges and its preparation method and application
  • A water-based polyurethane drug-loaded slow-release spray with opposite charges and its preparation method and application
  • A water-based polyurethane drug-loaded slow-release spray with opposite charges and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～24

[0072] 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 evenly; 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 obtain ...

Embodiment 25

[0080] 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.

[0081] 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

[0083] 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.

[0084] 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

A water-based polyurethane drug-loaded slow-release spray with opposite charges, its preparation method and application. It consists of anionic water-based polyurethane drug-loaded slow-release emulsion A with hydrophobic pesticide active ingredients and cationic water-based polyurethane drug-loaded slow-release emulsion B with hydrophobic pesticide active ingredients. The present invention utilizes the mutual attractive force between the anionic and cationic waterborne polyurethane particles, the hydrogen bonding effect and the reducing effect on the surface energy of the droplet to effectively improve the deposition rate of the sprayed droplet, and at the same time, effectively protect the active ingredients of the pesticide, Improve pesticide slow-release performance, rain erosion resistance, etc., and have simple components, good dispersion and storage stability, safe and non-toxic carrier, less 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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Patent Type & Authority Patents(China)
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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