Method for preparing matrine/carboxymethyl chitosan/phosphonic chitosan pesticide nanoparticle aqueous dispersion preparation

Abstract

The invention discloses a preparation method and use of a matrine / carboxymethyl chitosan / phosphonic chitosan pesticide nanoparticle aqueous dispersion preparation. The method comprises the following The invention discloses a preparation method and use of a matrine / carboxymethyl chitosan / phosphonic chitosan pesticide nanoparticle aqueous dispersion preparation. The method comprises the followingsteps: (1) preparing phosphonic chitosan; and (2) preparing matrine / carboxymethyl chitosan / phosphonic chitosan pesticide nanoparticle aqueous dispersion preparation. The method overcomes the water insteps: (1) preparing phosphonic chitosan; and (2) preparing matrine / carboxymethyl chitosan / phosphonic chitosan pesticide nanoparticle aqueous dispersion preparation. The method overcomes the water insoluble drawback of chitosan and provides a reference of the new agricultural use of the chitosan and derivatives thereof; An pesticide nanoparticle aqueous dispersion preparation is advantageous oversoluble drawback of chitosan and provides a reference of the new agricultural use of the chitosan and derivatives thereof; An pesticide nanoparticle aqueous dispersion preparation is advantageous overa simple water aqueous solution preparation in insect killing effect; after a botanical pesticide is nano-sized, the nano particles can protect and stabilize the pesticide to allow the pesticide to r a simple water aqueous solution preparation in insect killing effect; after a botanical pesticide is nano-sized, the nano particles can protect and stabilize the pesticide to allow the pesticide to release slowly in a controlled way; the preparation method is easy to implement and avoids use of organic solvent and assistant; and degradation products of the chitosan and the derivatives of the chitelease slowly in a controlled way; the preparation method is easy to implement and avoids use of organic solvent and assistant; and degradation products of the chitosan and the derivatives of the chitosan can adjust the growth of vegetables, and nitrogen and phosphor in the degradation products are fertilizers of vegetables, so the preparation of the invention is a real environmentally-friendly peosan can adjust the growth of vegetables, and nitrogen and phosphor in the degradation products are fertilizers of vegetables, so the preparation of the invention is a real environmentally-friendly pesticide.sticide.

Description

Technical field [0001] The invention belongs to the field of natural polymer modification and agricultural pesticide formulations, and particularly relates to a preparation method and application of a matrine / carboxymethyl chitosan / phosphorylated chitosan pesticide nanoparticle water dispersion formulation. Background technique [0002] Chitosan, a natural polysaccharide with cations, is favored by people because of its unique biological properties. However, chitosan can only dissolve in acidic solutions, which limits its direct application. On the one hand, as a drug carrier, acidic media can easily cause toxicity to organisms and interference with drug performance; on the other hand, chitosan molecules will precipitate out in aqueous solutions with neutral pH. This performance limits its application as a pesticide and drug carrier. Therefore, seeking a water-soluble approach to chitosan and preparing its water-soluble derivatives is the key to applying chitosan as a matrix ma...

AI Technical Summary

Problems solved by technology

However, compared with synthetic pesticides, there are still disadvantages of botanical pesticides: slow efficacy, easy decomposition of active ingredients, instability to light, and short duration

In addition, except for a few water-soluble plant-derived pesticides, most of them require artificial synthetic auxiliaries, and the composition of the preparation is complex, which is not conducive to environmental protection.

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