Degradable non-poisonous seed-coating agent and preparation method thereof

Abstract

A degradable nontoxic seed coating agent comprises basic materials of water-soluble chitosan of 1.0-1.5wt%, gelatine of 0.05-0.1wt%, glycerol of 0.05-0.1wt%, PVA of 1.0-1.5wt% and plant extract of remainder, with the tensile strength of 18.7MPa, elongation of 10.1%, vapor transmission rate of 12.69g.mm / mm2.hr.mmHg, air permeability of (CO2)0.358*10-10ml.cm / cm2s.cmHg, air permeability of (O2)0.215*10-10ml.cm / cm2s.cmHg, hygroscopic rate of 47% and apparent viscosity of 290cp; uses water-soluble chitosan, PVA and plant extract to form seed coating film to not only meet performance requirement of conventional seed coating agents, but remarkably improve performance of film.

Description

technical field

[0001] The invention belongs to the technical field of seed coating agents, and relates to a preparation method of a degradable nontoxic seed coating agent prepared by blending and reacting natural organic compounds and degradation products thereof. Background technique

[0002] Seed coating agent is a substance with film-forming properties used for coating crops or other crop seeds, usually composed of effective ingredients (insecticides, fungicides, etc.), film-forming agents, dispersants, antifreeze agents and It is processed by other auxiliaries and can be coated on the surface of seeds directly or after dilution to form a pesticide formulation with a certain strength and permeability. Compared with soaking seeds, seed dressing, and stuffing seeds, the seed coating agent treatment technology has the advantages of long duration of drug potency, multiple effects of one drug, water retention and drought resistance, promotion of growth, improvement of quality...

Examples

Embodiment 1

[0068] (1) Water-soluble chitosan Preparation of chitosan: Dissolve 50g of chitosan in 2% HAc aqueous solution, rapidly heat up to 60-65°C temperature, add 300g of 1-butyl-3-methylimidazolium chloride salt ionic liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 60g, keep warm (85°C) and react for 3 hours, adjust the pH value to 7.1, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 40°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan .

[0069] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1:1:1:50, and then distill it at 80-90°C for 2 hours, then cool down to 40°C Filter the plant extract.

[0070] (3) Batching: take each component by formula ratio, first water-soluble chitosan and polyvinyl alcohol are fully mixed with plant extract, then add other components, in th...

Embodiment 2

[0073] (1) Water-soluble chitosan Preparation of chitosan: Dissolve 100g chitosan in 2% HAc aqueous solution, rapidly heat up to 60-70°C temperature, add 500g 1-butyl-3-methylimidazolium chloride ion In the liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 110g, keep warm (80°C) for 2 hours, adjust the pH value to 7.2, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 45°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan sugar.

[0074] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1.5:1.5:1:50, then fully back-distill at 80-90°C for 2 hours, and then lower the temperature by 50°C Filter the plant extract. Other steps and embodiment 1.

Embodiment 3

[0076] (1) Water-soluble chitosan Chitosan preparation: 70g chitosan is dissolved in 1.5% HAc aqueous solution, warming up to 70-85 ℃ of temperature rapidly, add 400g 1-butyl-3-methylimidazolium chloride ion In the liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 70g, keep warm (83°C) for 4 hours, adjust the pH value to 7.3, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 45°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan sugar.

[0077] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1.5:1.5:1:50, then fully back-distill at 80-90°C for 2 hours, and then lower the temperature by 50°C Filter the plant extract. Other steps and embodiment 1.

technical field

[0001] The invention belongs to the technical field of seed coating agents, and relates to a preparation method of a degradable nontoxic seed coating agent prepared by blending and reacting natural organic compounds and degradation products thereof. Background technique

[0002] Seed coating agent is a substance with film-forming properties used for coating crops or other crop seeds, usually composed of effective ingredients (insecticides, fungicides, etc.), film-forming agents, dispersants, antifreeze agents and It is processed by other auxiliaries and can be coated on the surface of seeds directly or after dilution to form a pesticide formulation with a certain strength and permeability. Compared with soaking seeds, seed dressing, and stuffing seeds, the seed coating agent treatment technology has the advantages of long duration of drug potency, multiple effects of one drug, water retention and drought resistance, promotion of growth, improvement of quality...

Examples

Embodiment 1

[0068] (1) Water-soluble chitosan Preparation of chitosan: Dissolve 50g of chitosan in 2% HAc aqueous solution, rapidly heat up to 60-65°C temperature, add 300g of 1-butyl-3-methylimidazolium chloride salt ionic liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 60g, keep warm (85°C) and react for 3 hours, adjust the pH value to 7.1, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 40°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan .

[0069] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1:1:1:50, and then distill it at 80-90°C for 2 hours, then cool down to 40°C Filter the plant extract.

[0070] (3) Batching: take each component by formula ratio, first water-soluble chitosan and polyvinyl alcohol are fully mixed with plant extract, then add other components, in th...

Embodiment 2

[0073] (1) Water-soluble chitosan Preparation of chitosan: Dissolve 100g chitosan in 2% HAc aqueous solution, rapidly heat up to 60-70°C temperature, add 500g 1-butyl-3-methylimidazolium chloride ion In the liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 110g, keep warm (80°C) for 2 hours, adjust the pH value to 7.2, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 45°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan sugar.

[0074] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1.5:1.5:1:50, then fully back-distill at 80-90°C for 2 hours, and then lower the temperature by 50°C Filter the plant extract. Other steps and embodiment 1.

Embodiment 3

[0076] (1) Water-soluble chitosan Chitosan preparation: 70g chitosan is dissolved in 1.5% HAc aqueous solution, warming up to 70-85 ℃ of temperature rapidly, add 400g 1-butyl-3-methylimidazolium chloride ion In the liquid (97wt%), add dropwise 30% H under stirring condition 2 o 2 70g, keep warm (83°C) for 4 hours, adjust the pH value to 7.3, cool to room temperature, separate the layered liquid by suction filtration, concentrate the filtrate at 45°C, precipitate with alcohol, wash, and dry to obtain water-soluble oligomeric chitosan sugar.

[0077] (2) Preparation of plant extract: Soak rosemary, Sophora flavescens, Sophora flavescens, and ultrapure water for 24 hours according to the ratio of 1.5:1.5:1:50, then fully back-distill at 80-90°C for 2 hours, and then lower the temperature by 50°C Filter the plant extract. Other steps and embodiment 1.

Images