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Method for preparing lignin urea-formaldehyde pesticide microcapsule

A technology of lignin and microcapsules, which is applied in botany equipment and methods, animal repellents, biocides, etc., can solve the problems such as no reports of lignin microcapsule wall materials, and achieve resource utilization and saving Good cost and shape

Inactive Publication Date: 2012-02-15
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also reported that dry and crushed alkali lignin is mixed with pesticides and adjuvants, granulated, and dried to make granular slow-release pesticides, and field experiments have been carried out, but lignin has not been seen as a microcapsule wall material in the existing literature. report

Method used

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  • Method for preparing lignin urea-formaldehyde pesticide microcapsule
  • Method for preparing lignin urea-formaldehyde pesticide microcapsule
  • Method for preparing lignin urea-formaldehyde pesticide microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Described raw material according to following proportioning:

[0059] Formaldehyde: urea = 1.75 (mass ratio), surfactant span85: deionized water = 3% (mass ratio), modified lignin: wall material (formaldehyde + urea + modified lignin) = 37.6% (mass ratio), abamectin: wall material (urea + formaldehyde + modified lignin) = 1 (mass ratio).

[0060] Add 1.333g of urea and 2.5ml of deionized water into the three-necked flask, stir to dissolve, adjust the pH value to 8~9 (using the range value) with 0.2mol / L sodium hydroxide solution, then add 3.0ml of formaldehyde, stir at 300rpm The temperature of the water bath was slowly raised to 75° C., and the stirring reaction was continued at this temperature for 80 min. Add 7.5 ml of an aqueous solution of modified lignin, and continue the reaction for 120 minutes to obtain a prepolymer solution, which is cooled to room temperature and placed.

[0061] The modification method of the lignin is: according to the ratio of 20g alkali...

Embodiment 2

[0065] Described raw material according to following proportioning:

[0066] Formaldehyde: urea = 1.75 (mass ratio), surfactant span85: deionized water = 3% (mass ratio), abamectin: wall material (urea + formaldehyde + modified lignin) = 1 (mass ratio ), wood modified quality: wall material (urea + formaldehyde + modified lignin) = 37.6% (mass ratio).

[0067] Weigh 1.333g of urea and 2.5ml of deionized water into a three-necked flask, stir and dissolve, adjust the pH to 8-9 with 0.2mol / L sodium hydroxide solution, then add 3.0ml of formaldehyde, and lower the temperature of the water bath at a stirring speed of 300rmp Slowly raise the temperature to 75°C, and keep stirring at this temperature for 80min. Add 7.5ml of modified lignin solution (refer to Example 1 for the preparation method), and continue to react for 120min to form a prepolymer solution. Then let cool to room temperature.

[0068] In the above prepolymer solution, add 12.0g of sodium chloride and 200ml of dei...

Embodiment 3

[0070] Described raw material according to following proportioning:

[0071] Formaldehyde: urea = 1.75 (mass ratio), surfactant span85: deionized water = 3% (mass ratio), modified lignin: wall material (formaldehyde + urea + modified lignin) = 44.6% (mass Ratio) Abamectin: wall material (urea + formaldehyde + modified lignin) = 0.5 (mass ratio).

[0072] Add 1.333g of urea and 2.5ml of deionized water into the three-necked flask, stir to dissolve, adjust the pH value to 8-9 with 0.2mol / L sodium hydroxide solution, then add 3.0ml of formaldehyde, and slowly lower the temperature of the water bath at a stirring speed of 300rpm Rise to 75°C, and keep stirring the reaction at the temperature for 70min. Add 10.0ml of modified lignin aqueous solution (refer to Example 1 for the preparation method), continue the reaction for 120min to obtain a prepolymer solution, cool to room temperature and place it.

[0073] In the above prepolymer solution, add 15.0g of sodium chloride and 200m...

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Abstract

The invention discloses a method for preparing a lignin urea-formaldehyde pesticide microcapsule. According to the invention, the method comprises the following steps: taking modified lignin, formaldehyde and urea as a monomer, forming a water-soluble performed polymer under base catalysis, diluting and forming continuous phase, forming dispersed phase by pesticide, an organic solvent and a surfactant, mixing and stirring the continuous phase and the dispersed phase to form an oil-in-water emulsion, performing in situ condensation polymerization under the acidic condition, heating and solidifying, pumping filtration and washing, drying to obtain the solid microcapsule particles. The modified lignin is obtained by formaldehyde hydroxymethyl modification of the industrial grade wheat straw soda lignin. According to the invention, the waste wheat straw soda lignin in paper industry is taken as the main wall material, so that the production cost of the microcapsule can be effectively reduced and the resource utilization of waste biomass can be realized. The preparation method of the invention has the advantages of simple process, rapidity and controllable microcapsule particle size, and is capable of realizing the industrial production, increasing the pesticide utilization rate, prolonging the persistent period, minimizing the environmental pollution in the process of agriculturalproduction, reducing the agriculture production cost and the like, and has good market prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of pesticide microcapsules, and in particular relates to a preparation method of lignin urea formaldehyde-based pesticide microcapsules. Background technique [0002] Pesticide microcapsule preparations have the characteristics of safety, low toxicity, high efficiency, low residue, good environmental compatibility, and long-lasting effect, and have become a new direction for the development of modern pesticides. However, due to the high cost of microcapsule preparation and unstable performance, microcapsule pesticide preparations have not been widely used in actual production. How to reduce costs and improve the encapsulation efficiency and sustained release performance of microcapsules is the key point for the popularization and application of microcapsule preparations. [0003] Lignin is a kind of complex aromatic polymer existing in plants. Its reserve in nature is second only to cellulose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/28A01N43/90A01N57/16A01N37/10
Inventor 付为金张淑婷
Owner SOUTH CHINA AGRI UNIV
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