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80% dimethomorph water dispersible granules and preparation method thereof

A technology of dimethomorph and dispersible granules, which is applied in the field of 80% dimethomorph water-dispersible granules and its preparation, can solve the problems that the suspension rate of water-dispersible granules cannot be met, the performance of dispersants is not good enough, etc., and achieve Easy to control release and orientation, effective electrostatic repulsion, good affinity effect

Active Publication Date: 2016-05-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the high original drug content limits the addition of various additives, leaving little space for additives in the formula. If the performance of the dispersant is not good enough, it cannot meet the suspension rate requirements of water-dispersible granules.

Method used

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  • 80% dimethomorph water dispersible granules and preparation method thereof
  • 80% dimethomorph water dispersible granules and preparation method thereof
  • 80% dimethomorph water dispersible granules and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of high carboxyl and high molecular weight lignin-based dispersants

[0034] After mixing 100g of wood pulp alkali lignin and 100g of catechol evenly, add 20g of concentrated sulfuric acid and react at 115°C for 0.5h. Then cool to room temperature, dissolve it with 150g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 40g of dodecenyl succinic anhydride in the reactor at room temperature, add 800g of dimethylformamide and 3g of sodium hydroxide, stir for 0.5h; raise the temperature to 80°C for 3h, and react After completion, filter, wash twice with ethanol with a mass concentration of 60%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a concentration of 30% by mass...

Embodiment 2

[0038] (1) Preparation of high carboxyl and high molecular weight lignin-based dispersants

[0039] After mixing 100g of wood pulp alkali lignin and 200g of catechol evenly, add 40g of concentrated sulfuric acid and react at 95°C for 1h. Then cool to room temperature, dissolve it with 250g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 30g of dodecenyl succinic anhydride in the reactor at room temperature, add 1200g of dimethylformamide and 5g of sodium hydroxide, stir for 1h; raise the temperature to 95°C for 2h, and the reaction ends Then filter, wash twice with ethanol with a mass concentration of 70%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a mass percentage concentration of ...

Embodiment 3

[0043] (1) Preparation of high carboxyl and high molecular weight lignin-based dispersants

[0044]After mixing 100g of wood pulp alkali lignin and 150g of catechol evenly, add 30g of concentrated sulfuric acid and react at 105°C for 0.5h. Then cool to room temperature, dissolve it with 200g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 40g of dodecenyl succinic anhydride in the reactor at room temperature, add 900g of dimethylformamide and 4g of sodium hydroxide, stir for 1h; raise the temperature to 90°C for 2.5h, and react After completion, filter, wash twice with ethanol with a mass concentration of 60%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a concentration of 40% by mass,...

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Abstract

The invention discloses 80% dimethomorph water dispersible granules and a preparation method thereof. The raw materials of the 80% dimethomorph water dispersible granules comprise, in percentage by mass, 80% of dimethomorph technical, 6%-10% of a lignin dispersing agent, 1%-5% of sodium dodecyl sulfate, 1%-6% of naphthalene sulfonate formaldehyde condensate and 0-5% of a disintegrating agent and 0-5% of kaolin, wherein the lignin dispersing agent is prepared from alkali lignin by improving the molecular weight and the carboxyl group content, the weight-average molecular weight of the lignin dispersing agent is larger than 15,000, the carboxyl group content is 3.2-4.0 mmol / g, the hydrophobicity is high, the 80% dimethomorph water dispersible granules can be efficiently adsorbed on the surfaces of pesticide granules and provide effective electrostatic repulsion and steric-hinerance effects, so that the dispersion stability of the dispersible granules is superior to that of ordinary sodium lignin sulfonate dispersing agents. Danger caused by an organic solvent in an emulsifiable solution is prevented, the defects of dust pollution of powder and the like are overcome, and the prepared dimethomorph water dispersible granules have good dispersity, high disintegration speed and high suspension rate.

Description

technical field [0001] The invention relates to a pesticide water-dispersible granule, in particular to an 80% dimethomorph water-dispersible granule and a preparation method thereof. Background technique [0002] Pesticides must be processed into various types of dosage forms before use. Traditional pesticide dosage forms are mainly emulsifiable concentrates and powders. Organic solvents such as toluene and xylene used in emulsifiable concentrates and dust pollution in powders all have adverse effects on the environment and users. Water-dispersible granules are new formulations of pesticides developed on the basis of wettable powders and suspension concentrates in the early 1980s. They can disintegrate and disperse rapidly in water to form a high-suspension dispersion system. Water-dispersible granules overcome the disadvantages of wettable powders and suspension concentrates but retain their advantages: no dust and no organic solvents, environmentally friendly; easy to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/14A01N43/84A01P3/00
CPCA01N25/14A01N43/84
Inventor 邱学青庞煜霞李媛李远黄锦浩易聪华
Owner SOUTH CHINA UNIV OF TECH
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