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Organic acid slow-release compound with insect-resistant and disease-resistant functions, its preparation and application

An organic acid and compound technology, applied in the fields of application, botany equipment and methods, biocides, etc., can solve the problems of high toxicity of pesticides, health threats, and the decline of pesticide resistance to insects and diseases, so as to solve the problems of pesticide residues, biological good compatibility

Active Publication Date: 2019-11-15
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Spraying pesticides is the main method for crops to prevent insects and diseases. Due to the high toxicity of pesticides, they are easy to accumulate in edible crops. Pesticides are continuously enriched through the food chain and eventually enter the human body, posing a huge threat to people's health.
Moreover, due to the increasing resistance of pests, bacteria, viruses, etc., the insect and disease resistance performance of pesticides has declined, and highly toxic pesticides have been used continuously, causing a vicious circle and increasing environmental pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Dissolve 1mol chitosan in 100mL 2% (w / v) acetic acid solution to obtain chitosan-acetic acid solution, stir for 1d, add NaOH to produce precipitation, filter, rinse with distilled water several times, add a small amount of methanol to disperse , to obtain solution A;

[0045] (2) Add a solution containing 1 mol of tetraethylenepentamine to the solution A obtained in step (1), add dropwise a solution containing 1 mol of epichlorohydrin under stirring, and continue stirring at 40° C. for 2 d. Add acetone to make it precipitate completely, wash it clean, add a small amount of ethanol to disperse, and obtain solution B;

[0046] (3) Dissolve 1 mol of salicylic acid in a small amount of ethanol, mix the solution B obtained in step (2), and react under reflux at 40° C. for 3 hours. 50% ethanol is recovered to obtain an organic acid slow-release compound with insect and disease resistance functions.

Embodiment 2

[0048] (1) Dissolve 1mol chitosan in 100mL 2% (w / v) acetic acid solution to obtain a chitosan-acetic acid solution, stir for 1.5d, add NaOH to produce a precipitate, filter, rinse with distilled water several times, add a small amount of methanol Disperse to obtain solution A;

[0049] (2) Add a solution containing 1 mol of tetraethylenepentamine to the solution A obtained in step (1), add dropwise a solution containing 1 mol of epichlorohydrin under stirring, and continue stirring at 80° C. for 1 d. Add acetone to make it precipitate completely, wash it clean, add a small amount of ethanol to disperse, and obtain solution B;

[0050] (3) Dissolve 1 mol of salicylic acid in a small amount of ethanol, mix the solution B obtained in step (2), and react under reflux at 80° C. for 1 h. 80% ethanol is recovered to obtain an organic acid slow-release compound with insect and disease resistance functions.

Embodiment 3

[0052] (1) Dissolve 1mol chitosan in 100mL 2% (w / v) acetic acid solution to obtain a chitosan-acetic acid solution, stir for 2 days, add NaOH to produce a precipitate, filter, rinse with distilled water several times, add a small amount of methanol to disperse , to obtain solution A;

[0053] (2) Add a solution containing 1 mol of tetraethylenepentamine to solution A obtained in step (1), add dropwise a solution containing 1 mol of epichlorohydrin under stirring, and continue to stir and react at 60° C. for 1.5 days. Add acetone to make it precipitate completely, wash it clean, add a small amount of ethanol to disperse, and obtain solution B;

[0054] (3) Dissolve 1 mol of salicylic acid in a small amount of ethanol, mix the solution B obtained in step (2), and react under reflux at 60° C. for 2 hours. 60% ethanol is recovered to obtain an organic acid slow-release compound with the function of preventing insects and diseases.

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Abstract

The invention discloses an organic acid sustained-release complex with functions of pest prevention and disease resistance, preparation and applications thereof, and belongs to the field of polymer modification and complexes. According to the present invention, a natural high-quality macromolecule material chitosan is modified to obtain tetraethylene pentamine chitosan having good water solubility, a natural pest-prevention and disease-resistance substance such as salicylic acid, abietic acid, caffeic acid and other organic acids is linked to the tetraethylene pentamine chitosan having good water solubility through a reflux reaction, and during the application, the organic acid is shed from the chitosan and is slowly released so as to achieve the long-lasting sustained-release pest-prevention and disease-resistance effect; and the obtained organic acid sustained-release complex has good performances of pest prevention and disease resistance, easily form the film, can be adhered onto the surface of crops or fruits to form the film, does not affect the plant growth, does not have toxic-side effect, can release the pest-prevention and disease-resistance substance in the long-lasting and sustained-release manner, can achieve the long-term pest-prevention and disease-resistance effect in the case of no pesticides, and can be used for production of green food.

Description

technical field [0001] The invention belongs to the field of polymer modification and compound, and specifically relates to an organic acid slow-release compound prepared by modifying chitosan with organic acid and having the function of preventing insects and diseases, as well as its preparation method and application. Background technique [0002] Spraying pesticides is the main method for crops to prevent insects and diseases. Due to the high toxicity of pesticides, they are easy to accumulate in edible crops. Pesticides are continuously enriched through the food chain and eventually enter the human body, posing a huge threat to people's health. Moreover, due to the increasing resistance of pests, bacteria, viruses, etc., the insect and disease resistance of pesticides has declined, and highly toxic pesticides have been used continuously, resulting in a vicious circle and increasing environmental pressure. With the continuous enhancement of people's health concept, people...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/10A01N25/24A01N37/40A01N37/08A01N37/38A01P1/00A01P3/00A01P7/00A01P21/00
CPCA01N25/10A01N25/24A01N37/08A01N37/38A01N37/40
Inventor 蒋刚彪刘永林
Owner SOUTH CHINA AGRI UNIV
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