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CN-122004208-A - Application of quaternized copolymer in preparation of pesticide slow-release agent and pesticide slow-release agent

CN122004208ACN 122004208 ACN122004208 ACN 122004208ACN-122004208-A

Abstract

The invention discloses an application of a quaternized copolymer in preparing a pesticide sustained release agent and the pesticide sustained release agent, belonging to the technical field of functional polymer materials and pesticide controlled release. The quaternized copolymer is prepared by reacting 1,3, 5-tribromomethyl benzene with 1, 4-dimethylpiperazine, and can be applied to preparation of pesticide sustained release agents. The quaternized copolymer has excellent loading capacity to pesticides, has environmental stimulus response property, can regulate and control pesticide release rate through external environmental stimulus (such as pH, ionic strength and the like), remarkably improves pesticide utilization rate and reduces environmental pollution, and is suitable for preparing efficient and low-toxicity pesticide sustained release agents in the agricultural field.

Inventors

  • LI BING
  • ZHANG QIAN

Assignees

  • 浙江农林大学

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The application of the quaternized copolymer in preparing pesticide slow-release agents is characterized in that the quaternized copolymer is prepared by reacting 1,3, 5-tribromomethyl benzene with 1, 4-dimethylpiperazine.
  2. 2. The use of the quaternized copolymer according to claim 1 for the preparation of a pesticide slow release formulation, characterized in that the preparation method of the quaternized copolymer comprises the steps of: Dissolving 1,3, 5-tribromomethyl benzene and 1, 4-dimethyl piperazine in a polar aprotic solvent, and heating to react to obtain a target product.
  3. 3. The application of the quaternized copolymer according to claim 2 in preparing pesticide slow release agents, wherein the molar ratio of the 1,3, 5-tribromomethyl benzene to the 1, 4-dimethylpiperazine is (0.5-1.5): 1-2.
  4. 4. The use of a quaternized copolymer in accordance with claim 2 for the preparation of a pesticide slow release formulation, wherein said polar aprotic solvent is N, N-dimethylacetamide.
  5. 5. The use of the quaternized copolymer according to claim 4 for preparing a pesticide slow release agent, wherein the volume ratio of the N, N-dimethylacetamide in the reaction vessel is 30% -60%.
  6. 6. The use of the quaternized copolymer according to claim 2 for the preparation of a pesticide slow release agent, wherein the reaction temperature of the heating reaction is 120-180 ℃ and the reaction time is 24-60 h.
  7. 7. The use of the quaternized copolymer according to claim 2 for preparing a slow release formulation of agricultural chemicals, wherein after the completion of the heating reaction, the product is filtered and washed and dried, the washing agent is a mixture of water and N, N-dimethylacetamide, and the drying temperature is 60-80 ℃.
  8. 8. The use of a quaternized copolymer in the preparation of a pesticide slow release formulation according to claim 1, characterized in that the pesticide slow release formulation further comprises a salt containing Cl - and SO 4 2- , the pesticide being 2,4-D-Na.
  9. 9. The pesticide slow release agent is characterized by comprising a quaternized copolymer, wherein the quaternized copolymer is prepared by reacting 1,3, 5-tribromomethyl benzene with 1, 4-dimethylpiperazine.
  10. 10. A pesticide slow release formulation according to claim 9, further comprising salts containing Cl - and SO 4 2- .

Description

Application of quaternized copolymer in preparation of pesticide slow-release agent and pesticide slow-release agent Technical Field The invention relates to the technical field of high molecular functional materials and pesticide controlled release, in particular to application of a quaternized copolymer in preparation of a pesticide slow release agent and the pesticide slow release agent. Background With the rapid development of modern agriculture, pesticides play a key role in pest control and grain safety guarantee. However, the traditional pesticide preparation (such as emulsifiable concentrate, wettable powder and the like) has the problems of high release rate of active ingredients, short duration, low utilization rate and the like, so that the pesticide waste and the use cost are increased, and soil pollution, groundwater residue and ecological environment risks are easily caused. According to statistics, the field utilization rate of the conventional pesticide is less than 30%, and the rest part enters the environment through volatilization, leaching or runoff, so that potential hazard is caused to non-target organisms and an ecological system. Therefore, developing pesticide preparations with controlled release performance, realizing slow release and long-acting effect of active ingredients, has become an important direction for promoting the upgrade of pesticide dosage forms. The core principle of the pesticide slow release technology is that the release rate of the pesticide active ingredient is regulated and controlled by physical or chemical means, so that the active ingredient continuously and stably plays a role in the growth period of crops, thereby reducing the application times and improving the utilization rate. The early-stage sustained-release agent mainly adopts natural polymer materials (such as starch and cellulose) or synthetic resin as a carrier, but has the limitations of low drug loading, unstable sustained-release performance, poor biodegradability and the like. Therefore, it is urgent to develop a novel sustained release agent which is low in cost, environment-friendly and capable of accurately regulating the release rate. The novel pesticide slow release agent not only can improve the pesticide utilization rate, reduce the use cost and reduce the pollution to the environment, but also can effectively solve the defects of the traditional pesticide preparation and the existing slow release agent, and provides powerful guarantee for the green sustainable development of agriculture. Disclosure of Invention The invention aims to provide an application of a quaternized copolymer in preparing a pesticide slow-release agent and the pesticide slow-release agent, wherein the quaternized copolymer can realize slow release of pesticide after pesticide loading, improve weeding efficiency and reduce pesticide side effects. According to the technical scheme, in the first aspect, the invention provides application of a quaternized copolymer in preparation of pesticide sustained release agents, wherein the quaternized copolymer is prepared by reacting 1,3, 5-tribromomethyl benzene with 1, 4-dimethylpiperazine. Further, the preparation method of the quaternized copolymer comprises the following steps: Dissolving 1,3, 5-tribromomethyl benzene and 1, 4-dimethyl piperazine in a polar aprotic solvent, and heating to react to obtain a target product. Further, the molar ratio of the 1,3, 5-tribromomethyl benzene to the 1, 4-dimethylpiperazine is (0.5-1.5): 1-2. Further, the polar aprotic solvent is N, N-dimethylacetamide, and the volume ratio of the N, N-dimethylacetamide in the reaction vessel is 30% -60%. Further, the reaction temperature of the heating reaction is 120-180 ℃ and the reaction time is 24-60 h. Further, after the heating reaction is finished, filtering the product, washing and drying, wherein the washing reagent is a mixed solution of water and N, N-dimethylacetamide, and the drying temperature is 60-80 ℃. Further, the pesticide slow release agent comprises the quaternized copolymer, wherein the quaternized copolymer is a pesticide carrier, and the pesticide is 2,4-D-Na. Further, the pesticide slow release agent also comprises salts containing Cl - and SO 42-, and is used for adjusting the pesticide slow release rate. Furthermore, the pesticide slow release agent can be controllably released by adjusting the pH value, and the pH value is=5-9. In a second aspect, the invention also provides a pesticide slow release agent, which comprises a quaternized copolymer prepared by reacting 1,3, 5-tribromomethyl benzene with 1, 4-dimethylpiperazine. Further, the pesticide slow release agent can also comprise salts containing Cl - and SO 42-. The invention uses 1,3, 5-tribromomethyl benzene (TBMB) as a tridentate node, uses 1, 4-dimethyl piperazine (DMP) as a linear connecting unit, builds a permanently positively charged porous organic polymer-quaternized poly (1, 3, 5-tribromomethyl benzene-c