CN111972407A - Pesticide suspension dispersant and preparation method thereof - Google Patents
Pesticide suspension dispersant and preparation method thereof Download PDFInfo
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- CN111972407A CN111972407A CN202010758366.0A CN202010758366A CN111972407A CN 111972407 A CN111972407 A CN 111972407A CN 202010758366 A CN202010758366 A CN 202010758366A CN 111972407 A CN111972407 A CN 111972407A
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- Prior art keywords
- styrene
- pesticide suspension
- dispersant
- acrylic copolymer
- suspension dispersant
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
- A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/30—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests characterised by the surfactants
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- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Agronomy & Crop Science (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention discloses a pesticide suspension dispersant, which comprises the following components of 40-50% of acrylic copolymer by weight percent; 20-30% of vinyl ethers; 1-3% of an auxiliary agent; the balance of water. Acrylic copolymers include organic acids and styrene chemicals. The invention also discloses a preparation method of the pesticide suspension dispersant, the high-molecular polycarboxylate dispersant is synthesized by adopting an emulsion polymerization method, and the preparation method has the advantages of high polymerization rate and high molecular weight; the monomer is added into water, the oil-water interfacial tension is very large, and after the emulsifier is added, the emulsifier is actually a surfactant, so that the interfacial tension can be reduced, the monomer and the water form a stable dispersion system, and the dispersion performance and the stability are effectively improved.
Description
Technical Field
The invention relates to a pesticide suspension dispersant.
The invention also relates to a preparation method of the pesticide suspension dispersant.
Background
Traditional dispersants such as alkylbenzene sulfonate, alkylphenol ethoxylates, naphthalene sulfonate formaldehyde condensate, lignosulfonate and the like have a certain dispersion stabilizing effect, but due to the reasons of low molecular weight, unreasonable distribution of functional groups, poor environmental compatibility and the like, the obtained pesticide water suspension system has poor dispersion stability.
In order to keep original drug particles of the water dispersible granule of the environment-friendly pesticide formulation dispersed and stably suspended in an aqueous solution, the dispersing agent is required to have a hydrophilic group; meanwhile, good compatibility between the dispersing agent and the original medicine is ensured, the reduction of the utilization rate of the dispersing agent due to dissolution in a solution is avoided, and the hydrophobicity of the dispersing agent molecules needs to be properly improved. It is required for the dispersant to have both hydrophobic and hydrophilic groups. In recent years, polymer/nano MMT composite materials prepared by using a polymer as a matrix and MMT as an inorganic intercalation host cannot be used as a dispersant because they have excellent mechanical properties, thermal stability and the like, but they do not have a hydrophobic group and a hydrophilic group.
The existing polycarboxylate dispersant is generally prepared by solution polymerization, the solution polymerization has the advantages of easy diffusion of polymerization heat and easy control of polymerization reaction temperature; directly finishing the product in a solution mode; and the aqueous solution polymerization uses water as a solvent, which is very beneficial to environmental protection and the like. However, solution polymerization has the defects of slow polymerization rate and low molecular weight of the product, and the dispersing performance and the stability of the product are not ideal enough when the product is prepared into a pesticide preparation.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pesticide suspension dispersant with good dispersion effect. The hydrophilic group is required, and simultaneously, the good compatibility between the dispersing agent and the original medicine is ensured, the reaction speed is high, and the molecular weight of the product is higher.
The invention also provides a preparation method of the pesticide suspension dispersant.
The invention provides the following technical scheme:
the pesticide suspension dispersant comprises the following components in percentage by weight:
40-50% of acrylic copolymer;
20-30% of vinyl ethers;
1-3% of an auxiliary agent;
the balance of water.
The acrylic copolymer comprises organic acids and styrene chemicals, and the molar ratio of the organic acids to the styrene chemicals is 3-7: 1.
Further, the organic acid is selected from one or more of acrylic acid, methacrylic acid and maleic acid, and is mixed in any proportion.
Further, the vinyl ether alkene is selected from one or more than two of propyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and isobutenol polyoxyethylene ether which are mixed in any proportion.
Further, the styrene chemical is selected from styrene, sodium styrene sulfonate or methyl styrene.
Further, the auxiliary agent is selected from one of sodium dodecyl sulfonate, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide.
Further, the weight average molecular weight of the acrylic copolymer was 10000-15000 g/mol.
A preparation method of a pesticide suspension dispersant comprises the following steps:
a) adding auxiliary agent and vinyl ether into a reaction bottle, then adding distilled water to make the solid content in the system be 30-40%, stirring and heating to 50-100 ℃;
b) mixing organic acids and styrene chemicals to perform a polymerization reaction to obtain an acrylic copolymer, adding the acrylic copolymer into the solution obtained in the step a), and then performing a heat preservation reaction for 2-8 hours;
c) cooling the solution obtained in the step b) to room temperature, and adjusting the pH value of the system to 7-8 by using alkali substances;
d) spray drying the copolymer solution prepared in the step c) to obtain the polycarboxylate dispersant.
Further, the alkali substance is sodium carbonate, potassium carbonate and sodium hydroxide.
Compared with the prior art, the invention has the beneficial effects that: the macromolecular polycarboxylate dispersant is synthesized by adopting an emulsion polymerization method, and has the advantages of high polymerization rate and high molecular weight; the monomer is added into water, the oil-water interfacial tension is very large, and after the emulsifier is added, the emulsifier is actually a surfactant, so that the interfacial tension can be reduced, the monomer and the water form a stable dispersion system, and the dispersion performance and the stability are effectively improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The pesticide suspension dispersant comprises the following components in percentage by weight:
40% of an acrylic copolymer;
20% of vinyl ethers;
1% of an auxiliary agent;
39 percent of water.
The acrylic copolymer comprises organic acids and styrene chemicals in a molar ratio of 3: 1.
The organic acid is selected from acrylic acid.
The vinyl ether alkene is selected from propyl polyoxyethylene ether.
The styrene chemical is selected from styrene.
The auxiliary agent is selected from sodium dodecyl sulfate.
The weight average molecular weight of the acrylic copolymer was 10000 g/mol.
A preparation method of a pesticide suspension dispersant comprises the following steps:
a) adding an auxiliary agent and vinyl ether into a reaction bottle, then adding distilled water to ensure that the solid content in the system is 30%, stirring and heating to 50 ℃;
b) mixing organic acids and styrene chemicals to perform a polymerization reaction to obtain an acrylic copolymer, adding the acrylic copolymer into the solution obtained in the step a), and then performing a heat preservation reaction for 2 hours;
c) cooling the solution obtained in the step b) to room temperature, and adjusting the pH value of the system to 7 by using sodium carbonate;
d) spray drying the copolymer solution prepared in the step c) to obtain the polycarboxylate dispersant.
Example 2
The pesticide suspension dispersant comprises the following components in percentage by weight:
acrylic copolymer 45%;
vinyl ethers 22%;
2% of an auxiliary agent;
31 percent of water.
The acrylic copolymer comprises organic acids and styrene chemicals, and the molar ratio of the organic acids to the styrene chemicals is 5: 1.
The organic acid is one or more of acrylic acid, methacrylic acid and maleic acid, and is mixed at any ratio.
The vinyl ether alkene is selected from methyl allyl polyoxyethylene ether.
The styrene chemical is selected from sodium styrene sulfonate.
The auxiliary agent is selected from sodium dodecyl sulfate.
The weight average molecular weight of the acrylic copolymer was 12000.
A preparation method of a pesticide suspension dispersant comprises the following steps:
a) adding an auxiliary agent and vinyl ether into a reaction bottle, then adding distilled water to enable the solid content in the system to be 35%, stirring and heating to 75 ℃;
b) mixing organic acids and styrene chemicals to perform a polymerization reaction to obtain an acrylic copolymer, adding the acrylic copolymer into the solution obtained in the step a), and then performing a heat preservation reaction for 5 hours;
c) cooling the solution obtained in the step b) to room temperature, and adjusting the pH value of the system to 7.5 by using potassium carbonate;
d) spray drying the copolymer solution prepared in the step c) to obtain the polycarboxylate dispersant.
Example 3
The pesticide suspension dispersant comprises the following components in percentage by weight:
50% of an acrylic copolymer;
30% of vinyl ethers;
3% of an auxiliary agent;
and 17% of water.
The acrylic copolymer comprises organic acids and styrene chemicals, and the molar ratio of the organic acids to the styrene chemicals is 7: 1.
The organic acid is selected from maleic acid.
The vinyl ether alkene is selected from isobutylene alcohol polyoxyethylene ether.
The styrene chemical is selected from methyl styrene.
The auxiliary agent is selected from dodecyl trimethyl ammonium bromide.
The weight average molecular weight of the acrylic copolymer was 15000 g/mol.
A preparation method of a pesticide suspension dispersant comprises the following steps:
a) adding an auxiliary agent and vinyl ether into a reaction bottle, then adding distilled water to ensure that the solid content in the system is 40%, stirring and heating to 100 ℃;
b) mixing organic acids and styrene chemicals to perform a polymerization reaction to obtain an acrylic copolymer, adding the acrylic copolymer into the solution obtained in the step a), and then performing a heat preservation reaction for 8 hours;
c) cooling the solution obtained in the step b) to room temperature, and adjusting the pH value of the system to 8 by using sodium hydroxide;
d) spray drying the copolymer solution prepared in the step c) to obtain the polycarboxylate dispersant.
The organic acid may be selected from acrylic acid, methacrylic acid, and maleic acid, and may be mixed at any ratio.
The vinyl ether-based olefin can also be selected from more than two of propyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and isobutylene polyoxyethylene ether which are mixed in any proportion.
Dispersibility: the invention adopts a measuring cylinder mixing method, and comprises the following steps: 98mL of deionized water was added to a 100 mL graduated cylinder, 2g of the sample was weighed into the graduated cylinder, inverted 10 times for about 2s each, and the sediment was recorded at 30 min. The dispersion property was good for a trace amount of the precipitate, and not good for a large amount of the precipitate.
Tests show that the dispersing agent of the invention completely shows trace precipitation (good dispersibility).
When the pesticide suspending agent is prepared, the dosage of the suspending agent is 1-10% of the weight of the pesticide, the suspension rate reaches 99.86%, and the particle size of pesticide particles is less than 2 mu m.
Vinyl ethers are put into a reaction bottle, and then organic acids with high activity and styrene chemicals are put into the reaction bottle, so that a polymer product with uniform relative molecular weight and proper structure can be obtained, and the dispersion performance and the stability of the polymer are ideal.
The pesticide dispersing agent is obtained by adopting an emulsion polymerization method through organic acid, styrene chemicals and vinyl ethers, and the steric hindrance of the dispersing agent is increased and the suspension stability of the dispersing agent to dispersed substances is obviously improved due to the reaction of the vinyl ethers and acrylic acid copolymers.
The macromolecular polycarboxylate dispersant is synthesized by adopting an emulsion polymerization method, and has the advantages of high polymerization rate and high molecular weight; the monomer is added into water, the oil-water interfacial tension is very large, and after the emulsifier is added, the emulsifier is actually a surfactant, so that the interfacial tension can be reduced, the monomer and the water form a stable dispersion system, and the dispersion performance and the stability are effectively improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A pesticide suspension dispersant is characterized in that: comprises the following components in percentage by weight:
40-50% of acrylic copolymer;
20-30% of vinyl ethers;
1-3% of an auxiliary agent;
the balance of water;
the acrylic copolymer comprises organic acids and styrene chemicals, and the molar ratio of the organic acids to the styrene chemicals is 3-7: 1.
2. The pesticide suspension dispersant of claim 1, characterized in that: the organic acid is one or more than two of acrylic acid, methacrylic acid and maleic acid which are mixed in any proportion.
3. The pesticide suspension dispersant of claim 1, characterized in that: the vinyl ether alkene is selected from one or more than two of propyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and isobutylene alcohol polyoxyethylene ether which are mixed in any proportion.
4. The pesticide suspension dispersant of claim 1, characterized in that: the styrene chemical is selected from styrene, sodium styrene sulfonate or methyl styrene.
5. The pesticide suspension dispersant of claim 1, characterized in that: the auxiliary agent is selected from one of sodium dodecyl sulfate, sodium dodecyl sulfate and dodecyl trimethyl ammonium bromide.
6. The pesticide suspension dispersant of claim 1, characterized in that: the weight average molecular weight of the acrylic copolymer was 10000-15000 g/mol.
7. The method for preparing a pesticide suspension dispersant as set forth in claim 1, characterized in that: the method comprises the following steps:
a) adding auxiliary agent and vinyl ether into a reaction bottle, then adding distilled water to make the solid content in the system be 30-40%, stirring and heating to 50-100 ℃;
b) mixing organic acids and styrene chemicals to perform a polymerization reaction to obtain an acrylic copolymer, adding the acrylic copolymer into the solution obtained in the step a), and then performing a heat preservation reaction for 2-8 hours;
c) cooling the solution obtained in the step b) to room temperature, and adjusting the pH value of the system to 7-8 by using alkali substances;
d) spray drying the copolymer solution prepared in the step c) to obtain the polycarboxylate dispersant.
8. The method for preparing a pesticide suspension dispersant as set forth in claim 7, characterized in that: the alkali substance is one of sodium carbonate, potassium carbonate and sodium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758366.0A CN111972407A (en) | 2020-07-31 | 2020-07-31 | Pesticide suspension dispersant and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758366.0A CN111972407A (en) | 2020-07-31 | 2020-07-31 | Pesticide suspension dispersant and preparation method thereof |
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| CN111972407A true CN111972407A (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115067324A (en) * | 2021-08-10 | 2022-09-20 | 江苏新盛农业科技研究院有限公司 | High-molecular polycarboxylate dispersant and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103910832A (en) * | 2014-04-22 | 2014-07-09 | 南京太化化工有限公司 | Polycarboxylate pesticide dispersing agent and preparation method thereof |
| CN109169642A (en) * | 2018-08-23 | 2019-01-11 | 南京拓际生物科技有限公司 | A kind of wetting of highly effective pesticide aqueous suspension agent, dispersing agent preparation method |
| CN110054736A (en) * | 2019-04-11 | 2019-07-26 | 上海是大高分子材料有限公司 | A kind of polycarboxylate salt dispersant and preparation method thereof |
-
2020
- 2020-07-31 CN CN202010758366.0A patent/CN111972407A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103910832A (en) * | 2014-04-22 | 2014-07-09 | 南京太化化工有限公司 | Polycarboxylate pesticide dispersing agent and preparation method thereof |
| CN109169642A (en) * | 2018-08-23 | 2019-01-11 | 南京拓际生物科技有限公司 | A kind of wetting of highly effective pesticide aqueous suspension agent, dispersing agent preparation method |
| CN110054736A (en) * | 2019-04-11 | 2019-07-26 | 上海是大高分子材料有限公司 | A kind of polycarboxylate salt dispersant and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115067324A (en) * | 2021-08-10 | 2022-09-20 | 江苏新盛农业科技研究院有限公司 | High-molecular polycarboxylate dispersant and preparation method thereof |
| CN115067324B (en) * | 2021-08-10 | 2024-03-26 | 江苏新盛农业科技研究院有限公司 | High-molecular polycarboxylate dispersant and preparation method thereof |
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