Rapid preparation method of polyglutamic acid for pesticide adjuvants

A technology of polyglutamic acid and pesticide adjuvant, applied in botanical equipment and methods, chemicals used for biological control, applications, etc. Water retention capacity, stable properties

Inactive Publication Date: 2021-01-05
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing commercially available agricultural polyglutamic acid itself contains a large amount of suspended solids. When it is added to pesticides as a pesticide adjuvant, a large amount of precipitation will occur, which will

Method used

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  • Rapid preparation method of polyglutamic acid for pesticide adjuvants
  • Rapid preparation method of polyglutamic acid for pesticide adjuvants

Examples

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[0028]Example 1

[0029]Polyglutamic acid for a pesticide adjuvant, and its specific preparation steps:

[0030]Take 10L polyglutamic acid fermentation stock solution, the polyglutamic acid content in the polyglutamic acid fermentation stock solution is 3.5% (m / v), add phosphoric acid or concentrated sulfuric acid to adjust pH 2-3, stir at 70℃ for 5h, reduce the viscosity to 8mPa ·S, adjust pH5 with KOH solution;

[0031]Add 4wt% precipitant (the mass ratio of calcium nitrate and polyacrylamide in the precipitant is 1:1), continue to stir for 2h, and then centrifuge;

[0032]The separated supernatant is heated to 40°C, and then filtered with a ceramic membrane (membrane pore size is 0.2μm);

[0033]Add 1wt% precipitation agent to the filtered clear liquid, stir for 2h, and then centrifuge;

[0034]The supernatant after separation is treated with ultrafiltration equipment (the molecular weight cut-off is 20kDa), and 0.3% (m / v) potassium sorbate is added to the ultrafiltration.

[0035]The appearance of t...

Example Embodiment

[0036]Example 2

[0037]Polyglutamic acid for a pesticide adjuvant, and its specific preparation steps:

[0038]Take 10L polyglutamic acid fermentation stock solution, the polyglutamic acid content in the polyglutamic acid fermentation stock solution is 4.5% (m / v), add phosphoric acid or concentrated sulfuric acid to adjust pH 2-3, stir at 80℃ for 5h to reduce the viscosity to 8mPa ·S, adjust pH5 with KOH solution;

[0039]Add 4wt% precipitant (the mass ratio of calcium nitrate and polyacrylamide in the precipitant is 1:2), continue to stir for 2h, and then centrifuge;

[0040]The separated supernatant is heated to 50°C, and then filtered with a ceramic membrane (membrane pore size is 0.4μm);

[0041]Add 2wt% precipitant to the filtered clear liquid, stir for 2h, and then centrifuge;

[0042]The separated supernatant is treated with ultrafiltration equipment (with a molecular weight cut-off of 50kDa), and 0.3% (m / v) casson is added to the ultrafiltration.

[0043]The finished polyglutamic acid has a win...

Example Embodiment

[0044]Example 3

[0045]Polyglutamic acid for a pesticide adjuvant, and its specific preparation steps:

[0046]Take 10L polyglutamic acid fermentation stock solution, the polyglutamic acid content in the polyglutamic acid fermentation stock solution is 4.0% (m / v), add phosphoric acid or concentrated sulfuric acid to adjust the pH 2-3, stir at 75℃ for 5h, and reduce the viscosity to 8mPa ·S, adjust pH5 with KOH solution;

[0047]Add 3wt% precipitant (the mass ratio of calcium nitrate and polyacrylamide in the precipitant is 1:2), continue to stir for 2h, and then centrifuge;

[0048]The separated supernatant is heated to 60°C, and then filtered with a ceramic membrane (membrane pore size is 0.5μm);

[0049]Add 1wt% precipitant to the filtered clear liquid, stir for 2h, and then centrifuge;

[0050]The separated supernatant is treated with ultrafiltration equipment (the molecular weight cut-off is 10kDa), and 0.4% (m / v) potassium sorbate is added to the ultrafiltration.

[0051]The finished polyglutamic ...

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Abstract

The invention belongs to the technical field of pesticide adjuvants, and particularly relates to a rapid preparation method of polyglutamic acid for pesticide adjuvants, which comprises the followingsteps: carrying out acidolysis on a polyglutamic acid fermentation stock solution, adding a precipitant, centrifuging, filtering a supernatant with a ceramic membrane to remove thalli, carrying out ultrafiltration to remove micromolecular impurities, and adding Kathon or potassium sorbate to obtain the product. The polyglutamic acid for pesticide adjuvants obtained in the invention is a clear liquid from light yellow to wine red in appearance, has no pungent smell, has a pH value of 4-7, has no precipitate after heat storage at 54 DEG C for 30 days, and can increase the water retention capacity of crops and reduce the pesticide spraying frequency by adding the polyglutamic acid with a certain concentration to insecticides, herbicides and antibacterial agents. Therefore, the soil is protected, and the negative effects of pesticides are reduced.

Description

technical field [0001] The invention belongs to the technical field of pesticide adjuvants, and in particular relates to a rapid preparation method of polyglutamic acid for pesticide adjuvants. Background technique [0002] Polyglutamic acid (γ-PGA) is a high molecular weight, anionic polypeptide polymer synthesized by microorganisms from several glutamic acid monomers (D-type or L-type), which generally consists of 500-5000 glutamic acid Composed of monomers, the relative molecular mass is 10×10 3 -10000×10 3 . Two adjacent glutamic acids are connected by amide bonds, leaving a free carboxyl group for each glutamic acid. Therefore, a large number of free carboxyl groups on the main chain of γ-PGA can undergo reactions such as crosslinking, chelation, and derivatization. Since there are a large number of free hydrophilic carboxyl groups in the γ-PGA molecule, hydrogen bonds can be formed inside or between molecules, so the water retention performance is excellent, and at...

Claims

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Application Information

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IPC IPC(8): A01N47/36A01N25/32A01N25/00A01P13/00C08G69/46C12P13/02
CPCA01N25/00A01N25/32A01N47/36C08G69/46C12P13/02
Inventor 和富明柳华伟蔡颖辉刘海玉晁谨杨传伦秦培广韩立霞
Owner CHAMBROAD CHEM IND RES INST CO LTD
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