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Slow-release pesticide as well as preparation method and application thereof

A technology for slow-release pesticides and pesticides, applied in the field of pesticides, can solve problems such as difficulty in large-scale promotion, complicated preparation process, and limited loading capacity, and achieve good slow-release effects, simple operation, and large loading capacity

Active Publication Date: 2022-07-29
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polymer material carrier can be modified or modified according to actual needs, the preparation process is generally complicated and the cost is high, making it difficult to achieve large-scale promotion.
Inorganic materials, such as silica, attapulgite, activated carbon, montmorillonite, diatomite, etc., have high specific surface area, developed pore structure, and rich sources, and are widely used in the field of slow-release pesticides, but the above-mentioned inorganic materials The load capacity of the material is limited, the pores are mostly open structures, and the force is relatively poor compared with most drugs, and leakage is prone to occur

Method used

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  • Slow-release pesticide as well as preparation method and application thereof
  • Slow-release pesticide as well as preparation method and application thereof
  • Slow-release pesticide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The present embodiment takes stearic acid as the phase change material as an example, and prepares a series of slow-release pesticides with different stearic acid contents, and the specific process is as follows:

[0062] Weigh thiazophosphine (FOS) and stearic acid (SA) with a melting point of 60°C to ensure that the mass ratios of FOS and SA are 7:3, 6:4, 5:5, 4:6, 3:7 (hard). Fatty acid accounts for 30%, 40%, 50%, 60%, 70% of the mass of the mixture respectively), put it into a beaker, put it into a magnetic stirring heater, melt at 70 ° C, and stir evenly to obtain a thiazophosphine-stearic acid molten mixture (FOS-SA). The oxazophosphine-stearic acid molten mixture and expanded perlite were added to a round-bottomed flask in a mass ratio of 10:1, at 70°C, and stirred evenly. Then connect the hose (with piston) to the circulating water vacuum pump, turn on the vacuum pump, when the vacuum degree reaches 0.09 MPa, continue to evacuate for 1 min, close the piston, an...

Embodiment 2

[0064] In this example, palmitic acid is used as an example to prepare a series of slow-release pesticides with different palmitic acid contents. The specific process is as follows:

[0065] Weigh thiazophosphine (FOS) and palmitic acid (PA) to ensure that the mass ratios of FOS and PA are 7:3, 6:4, 5:5, 4:6, and 3:7 respectively (PA accounts for 30% of the mass of the mixture, respectively. %, 40%, 50%, 60%, 70%), melt at 70° C., and mix with magnetic stirring to obtain thiazophosphine-palmitic acid melt mixture (FOS-FA). Then, the molten FOS-PA and EP were added to the round-bottomed flask in a mass ratio of 10:1, and stirred uniformly at 70 °C. Then connect the round-bottomed flask to the circulating water vacuum pump through a silicone tube (with a piston), when the vacuum degree of the pump reaches 0.09MPa, continue to vacuumize for 1min, close the valve, and soak at 70°C for 1h. After hot filtration, samples were obtained, which were named as FOS-PA / EP-1, FOS-PA / EP-2, F...

Embodiment 3

[0067] In this example, palmitic acid and hydrogenated palm oil are used as phase-change materials as examples to prepare a series of slow-release pesticides with different contents of palmitic acid / hydrogenated palm oil. The specific process is as follows:

[0068] First take by weighing palmitic acid (PA) and hydrogenated palm oil (HPO), ensure that the mass ratios of the two are respectively 4.5:0.5, 4:1, 3:2, put into a beaker, put into a magnetic stirring heater, melt at 70 °C, Stir well to obtain the mixture PA-HPO. Then, weigh the same mass of FOS as the mixture, add it into the mixture PA-HPO, and stir uniformly under magnetic force at 70 °C to obtain a FOS-PA-HPO mixture. FOS-PA-HPO and EP were added to a round-bottomed flask in a mass ratio of 10:1, and stirred uniformly at 70 °C. Then connect the hose (with piston) to the circulating water vacuum pump, turn on the vacuum pump, when the vacuum degree reaches 0.09MPa, continue to vacuumize for 1min, close the piston,...

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Abstract

The invention belongs to the field of pesticides, and particularly relates to a slow-release pesticide and a preparation method and application thereof. The slow-release pesticide comprises a carrier with a porous structure and a mixture loaded in the carrier, the mixture comprises a phase change material and a pesticide, and the pesticide is dispersed in the phase change material. According to the invention, the mixture of the phase-change material and the pesticide is loaded in the carrier, and the high-temperature melting and low-temperature curing properties of the phase-change material are utilized, so that the problems of overflow leakage, strong odor, high toxicity and the like caused by the fact that the carrier only loads the pesticide are effectively avoided, and slow release of the pesticide is realized. The slow-release pesticide also has pH and temperature response release characteristics, the release rate of the slow-release pesticide can be controlled by adjusting the pH and temperature of an application environment so as to meet the use requirements of different occasions, the preparation method is simple, the cost is low, and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of pesticides, in particular to slow-release pesticides and a preparation method and application thereof. Background technique [0002] Pesticide slow-release agent, also known as slow-release pesticide, is a kind of pesticide based on the occurrence law of pests, hazard characteristics and environmental factors, through physical or chemical means, to make the active ingredients of pesticides slowly in a predetermined time and in a predetermined environment. External release, pesticide formulation with slow release function. It has the following advantages: (1) It can prolong the release time of active ingredients, reduce the number of spraying, prolong the crop protection period, and reduce the cost of prevention and control; (2) During the preparation process, the coating of the carrier used can reduce the exposure of active ingredients to light, acid, etc. Problems such as degradation and photolysis caused by natu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/08A01N25/22A01N57/32A01N57/12A01N57/14A01N41/02A01P7/04C09K17/08A01G13/00C09K101/00
CPCA01N25/08A01N25/22A01N57/32A01N57/12A01N57/14A01N41/02C09K17/08A01G13/00C09K2101/00Y02A50/30
Inventor 阎杰黄惠敏邬子君周志坚许秋林李侨光
Owner ZHONGKAI UNIV OF AGRI & ENG
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