Heat-insensitive thickener for pesticide water-base preparation and preparation method and application of thickener

A thickener and pesticide technology, which is applied in the field of temperature-resistant thickener for pesticide water-based formulations and its preparation, can solve the problem of difficulty in obtaining high-molecular-weight polymers, poor thickening water medium capability, and thickening agents. The problem of high cost is to achieve the effects of excellent water solubility, strong ability to thicken water medium, and long time.

Inactive Publication Date: 2012-01-04
YANGZHOU SPED CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that lauryl methacrylate is insoluble in water, and a large amount of surfactant should be added during the copolymerization. On the one hand, the cost of the synthesized thickener is high, and on the other hand, it is difficult to obtain high molecular weight. Polymer, resulting in poor ability to thicken the aqueous medium, which greatly increases the cost of the application and limits the application

Method used

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  • Heat-insensitive thickener for pesticide water-base preparation and preparation method and application of thickener
  • Heat-insensitive thickener for pesticide water-base preparation and preparation method and application of thickener

Examples

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Embodiment 1

[0027] The present invention will be further described below in conjunction with the examples, but the present invention is not limited. Unless otherwise stated, all parts and percentages in the examples are by mass; unless otherwise stated, the rotational viscosity is measured at 25° C. with a DV-II+Pro viscometer from Brookfield, USA.

[0028] Example 1 Preparation of monomer (A)

[0029] In a 500ml three-necked bottle with a stirrer, reflux condenser and thermometer, add 172g of isomeric tridecyl alcohol polyoxyethylene ether (EO=1-30) and 60g of methyl ethyl ketone, start stirring, and wait until the isomerization of thirteen After the alcohol polyoxyethylene ether is completely dissolved, add 1.5g of p-toluenesulfonic acid and 26g of maleic acid, heat and reflux at 80°C for 3.5 hours, evaporate the solvent under reduced pressure, and obtain a white transparent liquid product which is the active macromonomer (A).

Embodiment 2

[0031] In a 500ml three-neck flask equipped with a stirrer, reflux condenser and thermometer, add 300ml of deionized water, 0.02g of potassium persulfate, and then add 45g of acrylamide and 5.2g of monomer (A), under nitrogen protection, Raise the temperature to 70°C, react for 7 hours, dry the copolymer at 50°C, separate and purify to obtain a heat-insensitive thickener for pesticide water-based preparations. The analytical index of the thickener for heat-insensitive pesticide water-based preparations: viscosity (1% aqueous solution) 169mPa·S; surface tension (1% aqueous solution) 27mN / m.

Embodiment 3

[0033]In a 500ml three-neck flask equipped with a stirrer, reflux condenser and thermometer, add 350ml of deionized water, 54g of acrylamide and 6.5g of monomer (A), pass through N 2 Vacuum for 30 minutes, add 0.024 g of azobisisobutylcyanide, and react at a constant temperature of 65° C. for 8 hours to obtain a viscous liquid that is a thickener for heat-insensitive pesticide water-based preparations. The analytical index of the thickener for heat-insensitive pesticide water-based preparations: viscosity (1% aqueous solution) 178mPa·S; surface tension (1% aqueous solution) 28mN / m.

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Abstract

The invention discloses a heat-insensitive thickener for a pesticide water-base preparation and a preparation method and application of the thickener. The preparation method of the heat-insensitive thickener for the pesticide water-base preparation comprises the following steps of: performing polymerization reaction on a monomer (A) and a monomer (B) under the action of an initiator at the temperature of between 20 and 100 DEG C for 0.5 to 24 hours to obtain the heat-insensitive thickener for the pesticide water-base preparation, wherein the initiator is inorganic salts or azo; the monomer (A) is paste obtained by mixing isomerous tridecanol polyoxyethylene ether, methylbenzene, maleic acid and p-toluenesulfonic acid, heating, refluxing and co-boiling to remove redundant water and residual methylbenzene; and the monomer (B) is one or more of water-soluble monomers with unsaturated double bonds. The pesticide water-base preparation prepared from the heat-insensitive thickener for the pesticide water-base preparation has a good thickening effect and high surface activity, temperature resistance and water solubility, the thickening effect of the thickener cannot be reduced along with the rise of the temperature, and the viscosity of the water-base pesticide preparation can be increased.

Description

technical field [0001] The invention relates to a method for preparing a heat-insensitive thickener for water-based pesticide preparations, in particular to a temperature-resistant thickener for water-based pesticide preparations and a preparation method thereof. Background technique [0002] Thickener, also known as gelling agent, is a rheological additive that can increase the viscosity of the system and improve the rheology of the system. Adding a small amount of thickener to the system that needs to be thickened can increase the apparent viscosity of the system. At the same time, it keeps the system in a uniform and stable suspension or emulsified state, or forms a gel. Thickeners are widely used in food, coatings, adhesives, cosmetics, detergents, pesticides and other fields. For a long time, chemical pesticides have made outstanding contributions to increasing agricultural production and farmers' income. However, due to the irrational use of chemical pesticides by hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/24C08F290/06C08F222/20C08F220/56C08F220/06A01N25/04
Inventor 秦敦忠
Owner YANGZHOU SPED CHEM
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