Method for preparing rotenone/carboxymethyl chitosan grafting ricinoleic acid nanometer grain water dispersing agent

A technology of carboxymethyl chitosan and ricinoleic acid is applied in the directions of botanical equipment and methods, chemicals for biological control, biocides, etc. More, conducive to penetration and poisoning effect

Inactive Publication Date: 2009-09-02
广州市正华生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, except for a few water-soluble pesticides, most of them are insoluble in water. In order to make water-based preparations, a large amount of organic solvents and auxiliaries need to be used, which is not conducive to environmental protection.

Method used

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  • Method for preparing rotenone/carboxymethyl chitosan grafting ricinoleic acid nanometer grain water dispersing agent
  • Method for preparing rotenone/carboxymethyl chitosan grafting ricinoleic acid nanometer grain water dispersing agent
  • Method for preparing rotenone/carboxymethyl chitosan grafting ricinoleic acid nanometer grain water dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of chitosan-grafted ricinoleic acid (CS-g-RA): Weigh 29.85g of ricinoleic acid into a flask, add 20.4g of acetic anhydride to the flask, seal the reaction system, and heat in an oil bath at 139°C , Reaction 4h. Remove the generated acetic acid and unreacted acetic anhydride under reduced pressure (78°C, 90KPa) to obtain a reddish-brown castor oil anhydride liquid, which is dried and sealed for future use. Weigh the viscosity average molecular weight to be 1.2×10 5 1. Deacetylation degree is 90% chitosan 1g, is dissolved in 30ml glacial acetic acid 1% (v / v) aqueous solution, adds 70ml methyl alcohol and vigorously stirs, makes solution system become clear and even, adds sodium iodide 2g, mixes, Add ricinoleic anhydride and pyridine dropwise, wherein the molar ratio of ricinoleic anhydride / chitosan amino group is 3:1, and the molar ratio of pyridine and ricinoleic anhydride is 3:1, stir vigorously to make it evenly mixed; react at 70°C for 10h , soaked w...

Embodiment 2

[0033] (1) Preparation of chitosan-grafted ricinoleic acid (CS-g-RA): Weigh 29.85g of ricinoleic acid into a flask, add 20.4g of acetic anhydride to the flask, seal the reaction system, and heat in an oil bath at 139°C , Reaction 4h. Remove the generated acetic acid and unreacted acetic anhydride under reduced pressure (78°C, 90KPa) to obtain a reddish-brown castor oil anhydride liquid, which is dried and sealed for future use. Weigh the viscosity-average molecular weight to be 5.8×10 3 1. Deacetylation degree is 93% chitosan 1g, is dissolved in 30ml glacial acetic acid 1% (v / v) aqueous solution, adds 70ml methyl alcohol and vigorously stirs, makes solution system become clear and even, adds sodium iodide 3g, mixes, Add ricinoleic anhydride and pyridine dropwise, the molar ratio of ricinoleic anhydride / chitosan amino group is 2:1, the molar ratio of pyridine and ricinoleic anhydride is 4:1, stir vigorously to make it evenly mixed; react at 65°C for 12h, Soak and wash with ac...

Embodiment 3

[0038] (1) Preparation of chitosan-grafted ricinoleic acid (CS-g-RA): Weigh 29.85g of ricinoleic acid into a flask, add 20.4g of acetic anhydride to the flask, seal the reaction system, and heat in an oil bath at 139°C , Reaction 4h. Remove the generated acetic acid and unreacted acetic anhydride under reduced pressure (78°C, 90KPa) to obtain a reddish-brown castor oil anhydride liquid, which is dried and sealed for future use. Weigh the viscosity-average molecular weight to be 8.5×10 3 1. The degree of deacetylation is 99% chitosan 1g, dissolved in 30ml glacial acetic acid 1% (v / v) aqueous solution, adding 70ml methyl alcohol and vigorously stirring, making the solution system clear and uniform, adding sodium iodide 4g, mixing, Add ricinoleic anhydride and pyridine dropwise, the molar ratio of ricinoleic anhydride / chitosan amino group is 4:1, the molar ratio of pyridine and ricinoleic anhydride is 5:1, stir vigorously to make it evenly mixed; react at 75°C for 12h, Soak and...

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Abstract

The invention discloses a preparation method and application of a rotenone / carboxymethyl chitosan grafting ricinoleic acid nanometer grain water dispersing agent. The method comprises the following steps that: chitosan and sodium iodide are mixed; the mixture is added with castor-oil acid anhydride and pyridine for reaction at constant temperature, and then the reacted product is dewatered and washed; the mixture is dispersed in sodium hydroxide and isopropyl alcohol; the obtained mixture is added with an isopropyl alcohol solution of chloroacetic acid; the obtained mixed solution is subjected to ultrasonic reaction, neutralization, precipitation, suction filtration and immersion cleaning; and the obtained mixture is dissolved in an acetone solution of rotenone to obtain the finished product. In the method, the carboxymethyl chitosan grafting ricinoleic acid loads pesticide molecules, the degraded product, namely oligosaccharide can adjust plant growth, the ricinoleic acid is also a vegetable source pesticide; the design provides a new idea of developing an environment friendly pesticide; the pesticide molecules are loaded in the nanometer grains or on the surfaces of the nanometer grains, and the nanometer grains can protect and stabilize the pesticide and make the pesticide play a role in slow release and controlled release; and the use of an auxiliary agent and the excessive use of an organic agent are avoided in the preparation process, so that the water dispersing agent prepared by the method is an environment friendly pesticide in real meaning.

Description

technical field [0001] The invention belongs to the field of functional polymer materials and agricultural pesticides, in particular to a carboxymethyl chitosan grafted ricinoleic acid copolymer and a rotenone containing the carboxymethyl chitosan grafted ricinoleic acid copolymer Preparation method and application of carboxymethyl chitosan grafted ricinoleic acid nanoparticle water dispersion preparation. Background technique [0002] Chitosan (CS for short) is a natural alkaline polysaccharide polymer with good biodegradability, bioactivity and biocompatibility, and is widely used in many fields. The strong intermolecular hydrogen bonds of high-molecular-weight CS make it generally insoluble in neutral water, which limits its application. Through the modification of chitosan, its hydrophilic and hydrophobic properties can be changed from the chemical structure, and the influence of hydrogen bonds can be weakened or eliminated. -NH attached to the 2-position carbon atom i...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08L51/02C08J3/07A01N43/90A01N43/16A01P21/00A01P7/00A01N25/22A01N37/36
Inventor 张子勇冯博华
Owner 广州市正华生物科技有限公司
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