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Prochloraz microcapsule taking industrial lignin as wall material and preparation method thereof

An industrial lignin and prochloraz technology, applied in the field of pesticides, can solve the problems of low pesticide load and encapsulation efficiency, complicated microcapsule preparation process, and complicated preparation process, and achieve good industrial application prospects, and the products are environmentally friendly and non-toxic , prepare simple effects

Active Publication Date: 2017-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the drug loading and encapsulation efficiency prepared by this method are improved, the lignosulfonate used needs to be aminated and modified, and a cross-linking agent needs to be added for subsequent reactions. The whole microcapsule preparation process is still complicated and the cost is relatively high. high
[0005] At present, microcapsules prepared with lignin as the main wall material generally have problems such as complicated preparation process, low pesticide loading and encapsulation efficiency, and high pesticide decomposition rate during the embedding process. Research on the preparation of pesticide microcapsules with lignin as the only wall material haven't seen yet

Method used

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  • Prochloraz microcapsule taking industrial lignin as wall material and preparation method thereof
  • Prochloraz microcapsule taking industrial lignin as wall material and preparation method thereof
  • Prochloraz microcapsule taking industrial lignin as wall material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Put 20g of alkali lignin in a 250mL beaker, add 180g of aqueous solution of pH 12 to dissolve the lignin, then add dilute hydrochloric acid to adjust the pH of the solution to 9, filter out insoluble matter, and obtain an aqueous solution of alkali lignin with a mass fraction of 10% .

[0035](2) get the alkali lignin aqueous solution 30g that makes in the step (1) and 50g pesticide imidamides and mix (water-oil ratio 0.6:1), by the supersonic ultrasonic radiation treatment 3min of power 500W, obtain the suspension that contains imidamide microcapsules liquid.

[0036] (3) centrifuging the suspension obtained in step (2) to obtain imidamide microcapsule paste, and dispersing with water to obtain imidamide microcapsule emulsion.

Embodiment 2

[0038] (1) Put 6g of lignosulfonate in a 250mL beaker, add 194g of pH 12 aqueous solution to dissolve lignin, then add dilute hydrochloric acid to adjust the pH of the solution to 7, filter out insoluble matter, and obtain lignin with a mass fraction of 3% Sulfonate aqueous solution.

[0039] (2) Get the lignosulfonate aqueous solution 50g that makes in the step (1) and mix (water-oil ratio 5:1) with 10g pesticide imidamide, process 1min by the supersonic ultrasonic radiation of power 1000W, obtain containing imidamide microcapsules suspension.

[0040] (3) centrifuging the suspension obtained in step (2) to obtain imidamide microcapsule paste, and dispersing with water to obtain imidamide microcapsule emulsion.

Embodiment 3

[0042] (1) Put 15g of solvent-based lignin in a 250mL beaker, add 185g of an aqueous solution of pH 12 to dissolve the lignin, then add dilute hydrochloric acid to adjust the pH of the solution to 8.5, filter out insolubles, and obtain a solvent-based lignin with a mass fraction of 7.5%. plain water solution.

[0043] (2) get the solvent type lignin aqueous solution 50g that makes in the step (1) and 50g pesticide imidamide mix (water-oil ratio 1:1), process 2min by the supersonic ultrasonic radiation of power 700W, obtain the imidamide microcapsule containing suspension.

[0044] (3) centrifuging the suspension obtained in step (2) to obtain imidamide microcapsule paste, and dispersing with water to obtain imidamide microcapsule emulsion.

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Abstract

The invention belongs to the technical field of pesticides, and discloses a prochloraz microcapsule taking industrial lignin as a wall material and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving 1 to 20 parts by weight of industrial lignin in 100 to 200 parts by weight of water solution which has the pH value of 12, adjusting the pH value of the solution to 6 to 10, and filtering insoluble substances to obtain an industrial lignin solution; (2) mixing 10 to 50 parts by weight of the industrial lignin solution prepared in the step (1) with 2 to 20 parts by weight of prochloraz, and performing ultrasonic radiation under the power of 200 to 1,500W for 10s to 5min to obtain a prochloraz microcapsule suspension. The prochloraz microcapsule suspension has high photolysis resistance and slow release performance, is approximate to 100 percent in drug loading capacity, and is higher than 95 percent in encapsulation efficiency; the industrial lignin which contains a large quantity of benzene rings and phenol group structures is taken as the wall material, so that free radicals in a material can be removed effectively, and active compounds are prevented from being subjected to photolysis by ultraviolet rays in sunlight.

Description

technical field [0001] The invention belongs to the technical field of pesticides, in particular to a prochloraz microcapsule with industrial lignin as a wall material and a preparation method thereof. Background technique [0002] my country is a major producer and user of pesticides. In the past five years, the national pesticide consumption has been around 310,000 tons, with more than 1 million tons of preparations, and the utilization rate of pesticides has been around 35%. The amount of pesticides used in China has been five times higher than the world level, and "controlling the amount and improving efficiency" has become a necessary measure for the zero growth of pesticides. At the same time, with the development of pollution-free agriculture, especially the environmental pollution caused by high-toxicity and high-residue pesticides has attracted widespread attention, and farmers' investment in pesticides is undergoing four major changes: the choice of pesticides has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N47/38A01N25/10A01N25/28A01N25/04
CPCA01N25/04A01N25/10A01N25/28A01N47/38
Inventor 邱学青钱勇谭善元杨东杰楼宏铭庞煜霞刘伟峰
Owner SOUTH CHINA UNIV OF TECH