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Chitosan-based plant leaf surface water evaporation retardant and preparation method thereof

An evaporation inhibitor, chitosan technology, applied in the fields of botany equipment and methods, plant preservation, application, etc., can solve problems such as inability to accurately judge the spraying process, excessive pesticide residues in plants and soil, and easy occurrence of diseases and insect pests. Good biological safety and chemical stability, prolonging the effect of pesticide action time, and enhancing the effect of pesticide action force

Inactive Publication Date: 2017-02-22
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plants need a lot of water during planting and growth, and the leaves of plants will lose a lot of water due to transpiration. If water cannot be replenished in a timely and effective manner, it will lead to problems such as plant withering and outbreaks of diseases and insect pests, making it difficult for plants to grow and survive.
In Northwest my country, water resources are scarce, the climate is dry, the sunshine time is long, and the water evaporates faster, which is not conducive to the growth of crops, and pests and diseases are prone to occur. The use of chemical pesticides to prevent and control pests and diseases is an inevitable way to solve the problem of pests and diseases in agriculture.
During the spraying process, due to the rapid evaporation of water, the spraying process cannot be accurately judged, which can easily cause repeated spraying or partial spraying, which brings difficulties to the quantitative spraying operation in the field
At the same time, the ambient temperature is too high, and the pesticides sprayed on the leaves of the plants will dry up and fall off without penetrating into the pests due to water evaporation. The problem of excessive pesticide residues

Method used

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  • Chitosan-based plant leaf surface water evaporation retardant and preparation method thereof
  • Chitosan-based plant leaf surface water evaporation retardant and preparation method thereof
  • Chitosan-based plant leaf surface water evaporation retardant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) 5 g of chitosan was added to 50 g of 30% sodium hydroxide solution at room temperature, alkalized for 12 hours, and 30 mL of absolute ethanol was added to obtain a 7.7% (w / v) chitosan solution.

[0040] (2) Dissolve 5g of chloroacetic acid in 10mL of absolute ethanol, fully dissolve to obtain a 50% (w / v) ethanol solution of chloroacetic acid, add it dropwise to the chitosan solution under stirring, and react for 2 hours at room temperature , continue the reaction at 50°C for 1 hour.

[0041] (3) After cooling, adjust the pH of the solution with glacial acetic acid to be 6.5, and then filter under reduced pressure after cooling, and the product is washed with 75% aqueous ethanol until there is no Cl in the filtrate. - residual. The product was dried in an oven to obtain carboxymethyl chitosan.

[0042] (4) With stirring at room temperature, add 1 g of carboxymethyl chitosan to 50 mL of 0.1 mol·L -1 Slowly dissolve in the hydrochloric acid solution, continue to sti...

Embodiment 2

[0048] (1) 5 g of chitosan was added to 50 g of 40% sodium hydroxide solution at room temperature, alkalized for 14 hours, and 20 mL of absolute ethanol was added to obtain a 10% (w / v) chitosan solution.

[0049] (2) Dissolve 5g of chloroacetic acid in 10mL of absolute ethanol, fully dissolve to obtain a concentration of 50% (w / v) chloroacetic acid ethanol solution, add it dropwise to the chitosan solution under stirring, and react for 3 hours at room temperature , continue the reaction at 60°C for 2 hours.

[0050] (3) After cooling, adjust the pH of the solution with glacial acetic acid to be 7, and filter under reduced pressure after cooling, and the product is washed with 80% aqueous ethanol until there is no Cl in the filtrate. - residual. The product was dried in an oven to obtain carboxymethyl chitosan.

[0051] (4) With stirring at room temperature, add 1 g of carboxymethyl chitosan to 40 mL of 0.1 mol·L -1Slowly dissolve in the hydrochloric acid solution, continue ...

Embodiment 3

[0057] (1) 5 g of chitosan was added to 50 g of 40% sodium hydroxide solution at room temperature, alkalized for 16 hours, and 30 mL of absolute ethanol was added to obtain a 8.3% (w / v) chitosan solution.

[0058] (2) Dissolve 6.5g of chloroacetic acid in 10mL of absolute ethanol, fully dissolve to obtain a concentration of 65% (w / v) chloroacetic acid ethanol solution, add drop by drop in the chitosan solution under stirring, react at room temperature for 4 Hours, the reaction was continued at 65°C for 2 hours.

[0059] (3) After cooling, adjust the pH of the solution with glacial acetic acid to be 7, and then filter under reduced pressure after cooling, and the product is washed with 75% aqueous ethanol until there is no Cl in the filtrate. - residual. The product was dried in an oven to obtain carboxymethyl chitosan.

[0060] (4) With stirring at room temperature, add 1 g of carboxymethyl chitosan to 50 mL of 0.1 mol·L -1 Slowly dissolved in a hydrochloric acid solution, ...

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Abstract

The invention relates to a chitosan-based plant leaf surface water evaporation retardant and a preparation method thereof. A chitosan-based sol-gel system, namely, the retardant for retarding the plant leaf surface water evaporation rate, is prepared from carboxymethyl chitosan, gelatin and sodium beta-glycerophosphate through compounding. The preparation process is simple, the prepared sol system is sprayed to leaf surface, a colorless and transparent sol film layer can be formed rapidly through self-spreading, the environment temperature rises in summer, the sol film layer is changed into a thin gel layer, water can be locked by a three-dimensional network structure of gel, and leaf surface water evaporation is retarded. The chitosan-based plant leaf surface water evaporation retardant can effectively prolong the retention time of the water on the leaf surface and especially has good application feasibility in high-temperature drought regions in northwest. If the retardant is combined with a pesticide for application, the action time of the pesticide can be prolonged greatly, the action intensity of the pesticide is enhanced, and the retardant has great application value in decrement and synergism of the pesticide.

Description

technical field [0001] The invention belongs to the field of plant moisturizing and relates to preventing plant leaf water evaporation, and is a chitosan-based plant leaf water evaporation inhibitor and a preparation method thereof. Background technique [0002] The area of ​​China's arid regions accounts for 60% of the total area of ​​the country, and the economic losses caused by drought account for 35% of the total economic losses of various natural disasters. Plants need a lot of water during planting and growth, and the leaves of plants will lose a lot of water due to transpiration. If water cannot be replenished in a timely and effective manner, it will lead to problems such as plant withering and outbreaks of diseases and insect pests, making it difficult for plants to grow and survive. In Northwest my country, water resources are scarce, the climate is dry, the sunshine time is long, and the water evaporates faster, which is not conducive to the growth of crops, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N3/00
CPCA01N3/00
Inventor 吴燕律喆王丹丹彭啸
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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