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Nanosilica-grafted organic functional polymer organic phosphorous insecticide sustained-release agent and preparation method thereof

A nano-silicon dioxide and functional polymer technology, applied in the field of new pesticide formulations, can solve the problems of difficulty in exerting efficacy, poor dispersibility, and lack of controlled release capability of active ingredients, reducing the number of applications and lowering costs. , the effect of improving the utilization rate of pesticides

Active Publication Date: 2016-08-10
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These dosage forms have limitations such as the use of a large number of organic solvents, dust drift, and poor dispersion, and do not have the ability to control the release of active ingredients, resulting in rapid hydrolysis, photolysis or microbial metabolism of pesticides in the target body or in the environment near the target, making them When the concentration drops below the effective concentration, it is difficult to exert the drug effect

Method used

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  • Nanosilica-grafted organic functional polymer organic phosphorous insecticide sustained-release agent and preparation method thereof
  • Nanosilica-grafted organic functional polymer organic phosphorous insecticide sustained-release agent and preparation method thereof
  • Nanosilica-grafted organic functional polymer organic phosphorous insecticide sustained-release agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Add 2.0g nano-calcium carbonate, 0.8g cetyltrimethylammonium bromide (CTAB) and 105mL ethanol to a 250mL flask, add 10.5mL 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the reaction in a water bath At a temperature of 50°C, add 0.02mol ethyl orthosilicate to the above reaction system, and react for 72 hours;

[0041] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0042] (3) Add 100mL of water and ethanol (V / V=1:1), A obtained in step (2) to the three-necked flask, ultrasonically disperse for half an hour and control the reaction temperature at 35°C, add dropwise 0.02mol (CH 3 CH 2 O) 3 Si(CH 2 ) 3 NHCH 2 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain amino-mo...

Embodiment 2

[0050] (1) Add 1.0g of nano-calcium carbonate, 1.0g of cetyltrimethylammonium bromide (CTAB) and 97.5mL of ethanol to a 250mL flask, add 19.5mL of 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the water bath The reaction temperature is 35°C, add 0.04mol ethyl orthosilicate to the above reaction system, and react for 48h;

[0051] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0052] (3) Add 100mL of water and ethanol (V / V=1:1) and A obtained in step (2) to the three-necked flask, ultrasonically disperse for half an hour and control the reaction temperature at 25°C, add dropwise 0.02mol (CH 3 O) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain ami...

Embodiment 3

[0059] (1) Add 0.5g nano-calcium carbonate, 1.0g cetyltrimethylammonium bromide (CTAB) and 99mL ethanol to a 250mL flask, add 16.5mL 27wt% ammonia water after ultrasonic dispersion for half an hour, start stirring, and control the reaction in a water bath At a temperature of 25°C, add 0.02mol ethyl orthosilicate to the above reaction system, and react for 48 hours;

[0060] (2) adding excessive dilute hydrochloric acid, removing the nano-calcium carbonate template, centrifuging to remove the supernatant and washing the obtained solid, repeating three times, to obtain hollow nano-silica A;

[0061] (3) Add 100mL of water and ethanol (V / V=1:1) and A obtained in step (2) to the three-necked flask, control the reaction temperature at 40°C after ultrasonic dispersion for half an hour, and add 0.01mol (CH 3 CH 2 O) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 , reacted for 2 hours, centrifuged to remove the supernatant and washed the obtained solid, and repeated three times to obtain amino...

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Abstract

The invention relates to a nanosilica-grafted organic functional polymer organic phosphorous insecticide sustained-release agent and a preparation method thereof. An insecticide is defined to be one or a mixture of one selected from a group consisting of triazophos, chlopyrifos and profenofos. The preparation method comprises the following steps: preparing hollow nanosilica A; then preparing amino-modified hollow nanosilica B from the hollow nanosilica A and an aminosilane coupling agent; then reacting the amino-modified hollow nanosilica B, water, an unsaturated monomer compound, an initiator, a catalyst and a surfactant to a reaction so as to prepare C; and preparing the nanometer insecticide sustained-release agent from C and an insecticide. The preparation method is low in cost, mild in reaction condition, low in energy consumption and free of emission of waste gas, waste water and industrial residues; and the obtained sustained-release agent has a high loading rate, good environmental compatibility and a long action period, overcomes the problem of burst release of pesticides in certain carriers, reduces pesticide application frequency and increases the utilization rate of pesticides.

Description

technical field [0001] The invention relates to a nano silicon dioxide grafted organic functional macromolecule organophosphorus insecticide slow-release agent and a preparation method thereof, belonging to the technical field of new formulations of insecticides. Background technique [0002] In 2014, the production of chemical pesticides in my country reached 3.7 million tons, and the usage was close to 2 million tons. The long-term large-scale and low-efficiency application of pesticides (the effective utilization rate is only 10%-30%, and its loss rate is as high as 70%-90%) has caused the pesticide residues in my country's vegetables, fruits, grains, soil, and water to exceed the standard. The target organisms and human health pose a serious threat, which also leads to the destruction of the structure and function of the ecosystem. [0003] At present, the pesticide preparations produced and used in my country are mainly conventional pesticide formulations such as emulsi...

Claims

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Application Information

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IPC IPC(8): A01N25/10A01N57/14A01N57/16A01P7/00
CPCA01N25/10A01N57/14A01N57/16
Inventor 何顺李建洪万虎马洪菊游红张小磊高云昊沙黑拉什·拉马赞
Owner HUAZHONG AGRI UNIV
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