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Preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules

A technology of starch esters and microcapsules, which is applied in the preparation and application of natural polymer materials, can solve the problems of good slow-release effect and high embedding rate of pesticide microcapsules, to overcome the low solid content, improve the utilization rate of pesticides, and reduce the loss Effect

Inactive Publication Date: 2020-09-04
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the prepared caprylic acid starch ester as a wall material also solves the defect that traditional starch-based materials cannot be independently applied in the field of wall materials, and the obtained pesticide microcapsules have a high embedding rate and a good slow-release effect

Method used

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  • Preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules
  • Preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules
  • Preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of preparation method of octanoic acid starch ester is to mix starch, esterification agent octanoic acid, auxiliary agent sodium carbonate uniformly, then adopt mechanical activation solid-phase technology, carry out reaction under the condition of rotating speed 300r / min, constant temperature water bath temperature 50 ℃ for 60 Minutes, promptly obtain octanoic acid starch ester; Described octanoic acid quality accounts for 30% of starch dry basis, and described auxiliary agent quality accounts for 2% of starch dry basis; Described starch is tapioca starch.

[0033] The substitution degree analysis of the octanoic acid starch ester prepared by the embodiment of the present invention 1

[0034] Adopt nuclear magnetic resonance method to measure caprylic acid starch ester degree of substitution:

[0035] The octanoic acid starch ester product was dissolved in chloroform, and tested with a Bruker (Switzerland) AdvanceШHD 600MHz superconducting nuclear magnetic reson...

Embodiment 2

[0041] A preparation method of octanoic acid starch ester is to mix starch, esterification agent octanoic acid, and auxiliary agent sodium bicarbonate evenly, and then adopt mechanical activation solid-phase technology to react under the conditions of rotating speed 100r / min and constant temperature water bath temperature 100°C In 10 minutes, caprylic acid starch ester was obtained; the quality of the caprylic acid accounted for 25% of the dry basis of the starch, and the quality of the auxiliary agent accounted for 0.5% of the dry basis of the starch; the starch was tapioca starch. The degree of substitution of Example 2 was detected to be 0.26.

Embodiment 3

[0043] A kind of preparation method of octanoic acid starch ester, is to mix starch, esterification agent octanoic acid, auxiliary agent sodium carbonate uniformly, then adopt mechanical activation solid-phase technology, carry out reaction under the condition of rotating speed 500r / min, constant temperature water bath temperature 30 ℃ for 90 Minutes, promptly obtain octanoic acid starch ester; Described octanoic acid quality accounts for 10% of starch dry basis, and described auxiliary agent quality accounts for 10% of starch dry basis; Described starch is tapioca starch. The degree of substitution of Example 3 was detected to be 0.25.

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Abstract

The invention discloses a preparation method of octanoic acid starch ester and application of octanoic acid starch ester in pesticide microcapsules. The invention belongs to the technical field of preparation and application of natural polymer materials. The octanoic acid starch ester is prepared by adopting starch as a raw material, adding an auxiliary agent and an octanoic acid esterification agent and adopting a mechanical activation solid-phase technology, and the substitution degree of the octanoic acid starch ester is more than 0.25. The obtained octanoic acid starch ester is applied asa wall material to the field of pesticide microcapsules, and the embedding rate of the obtained pesticide microcapsules exceeds 88.6%. The octanoic acid starch ester is prepared by adopting a mechanical activation solid-phase technology, the method is simple, the obtained material has the characteristics of good film-forming property and low viscosity, the defects of high viscosity, poor fluidityand low solid content of traditional starch can be overcome, and the octanoic acid starch ester is applied to the field of pesticide microcapsules, is green and environment-friendly and plays a role in sustained and controlled release, so that the pesticide utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of natural polymer materials, in particular to a preparation method of caprylic acid starch ester and its application in pesticide microcapsules. Background technique [0002] A large amount of chemical fertilizers are directly lost, causing soil pollution, nutritional imbalance, and even increasing the immunity of diseases and insect pests due to excessive use of drugs. The reason is mainly that the active ingredients of pesticides are released quickly and the duration of drug effects is short. Therefore, microencapsulation of pesticides is an inevitable way for efficient utilization of pesticides. [0003] Microcapsule is a technology that uses natural or synthetic polymer materials as encapsulation materials to coat the capsule core (solid, liquid or gas) to form a semi-permeable or sealed capsule membrane, which can protect active substances and reduce external Adverse eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04A01N25/28A01N43/90A01N59/02A01N47/28A01P3/00A01P1/00A01P5/00A01P7/02A01P7/04A01P21/00
CPCA01N25/28A01N43/90A01N47/28A01N59/02C08B31/04
Inventor 胡华宇孙宁钊黄爱民黄祖强张燕娟梁景陈钰莹毛鑫覃宇奔陈丛瑾
Owner GUANGXI UNIV
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