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High-transparency salt-tolerant acrylic thickener and preparation method thereof

An acrylic thickener, high transparency technology, applied in the field of polymer materials, can solve the problems of reduced hydrophilicity of powder products, longer dispersion time, unclear liquid, etc., to achieve good light transmittance and thickening properties, Easy to swell and disperse, and improve the effect of light transmittance deterioration

Active Publication Date: 2022-03-25
贵州省欣紫鸿药用辅料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the light transmittance of the neutralized viscous liquid of the water-soluble copolymer having an alkyl-modified carboxyl group obtained in the presence of an electrolyte deteriorates or the liquid is not clear
In addition, due to the introduction of the hydrophobic structure of lauryl (meth)acrylate, the hydrophilicity of the obtained powder product is reduced, and when it is used as a thickener, the dispersion time tends to be longer

Method used

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  • High-transparency salt-tolerant acrylic thickener and preparation method thereof

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Embodiment 1

[0029] A preparation method of a high-transparency salt-resistant acrylic acid thickener of the present embodiment comprises the following preparation steps:

[0030] (1) In parts by weight, add 100 parts of acrylic acid monomer, 0.5 part of cross-linking agent pentaerythritol diallyl ether and 300 parts of organic solvent toluene into the reactor, raise the temperature to 55-60 ° C under nitrogen protection, and then drop Add the first initiator azobisisobutyronitrile toluene solution, the amount of azobisisobutyronitrile is 0.03 parts, the time for adding the first initiator is 1h, after the addition of the initiator is completed, the temperature is raised to 65-70°C for heat preservation reaction 3h.

[0031] (2) Add 6 parts of octadecyl methacrylate hydrophobic monomer and 0.6 parts of bismaleimide polyethylene glycol (MAL-PEG-MAL, average molecular weight 10000) to the reaction solution of step (1) Mix evenly, then add 0.01 part of benzoyl peroxide toluene solution at on...

Embodiment 2

[0033] A preparation method of a high-transparency salt-resistant acrylic acid thickener of the present embodiment comprises the following preparation steps:

[0034] (1) In parts by weight, 80 parts of acrylic acid monomers, 20 parts of methacrylic acid monomers, 0.2 parts of crosslinking agent pentaerythritol triallyl ether and 250 parts of organic solvent cyclohexane are added to the reactor, under nitrogen protection Lower the temperature to 55-60°C, then dropwise add the first initiator azobisisobutyrate dimethyl cyclohexane solution, the amount of azobisisobutyronitrile is 0.05 parts, and the first initiator dropping time is 1.5 h, after the initiator is added dropwise, the temperature is raised to 65-70°C and the temperature is kept for 2 hours.

[0035] (2) Add 3 parts of dodecyl methacrylate hydrophobic monomer and 0.3 parts of bismaleimide polyethylene glycol (MAL-PEG-MAL, average molecular weight 2000) to the reaction solution of step (1) Mix evenly, then add cyclo...

Embodiment 3

[0037] A preparation method of a high-transparency salt-resistant acrylic acid thickener of the present embodiment comprises the following preparation steps:

[0038] (1) In parts by weight, add 100 parts of acrylic acid monomer, 0.2 parts of allyl sucrose as a crosslinking agent and 400 parts of organic solvent ethyl acetate into the reactor, raise the temperature to 55-60°C under the protection of nitrogen, and then drop Add the first initiator azobisisoheptanonitrile ethyl acetate solution, the amount of azobisisoheptanonitrile is 0.02 parts, the time for adding the first initiator is 0.5h, and the temperature is raised to 65-70 after the addition of the initiator is completed. ℃ insulation reaction for 4h.

[0039] (2) Add 9 parts of lauryl methacrylate hydrophobic monomer and 0.9 part of bismaleimide polyethylene glycol (MAL-PEG-MAL, average molecular weight 5000) to the reaction solution of step (1) Mix evenly, then add 0.015 parts of ethyl acetate solution containing l...

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Abstract

The invention belongs to the technical field of polymer materials, and discloses a high-transparency salt-tolerant acrylic thickener and a preparation method thereof. The preparation method comprises the following steps: (1) adding a (methyl) acrylic monomer, a cross-linking agent and an organic solvent into a reactor, raising the temperature to 55-65 DEG C under the protection of nitrogen, then dropwise adding a first initiator solution, raising the temperature to 60-75 DEG C after dropwise adding an initiator, and carrying out heat preservation reaction; and (2) adding a (methyl) alkyl acrylate hydrophobic monomer and MAL-PEG-MAL into the reaction solution in the step (1), uniformly mixing, then adding a second initiator solution at one time, carrying out heat preservation reaction at 70-80 DEG C, and carrying out vacuum drying to remove the organic solvent, thereby obtaining the high-transparency salt-tolerant acrylic thickener. According to the invention, the specific MAL-PEG-MAL copolymerization crosslinking monomer is added to carry out the second polymerization reaction, and the obtained product has the characteristics of high viscosity, high light transmittance, salt resistance and easy dispersion.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-transparency salt-resistant acrylic acid thickener and a preparation method thereof. Background technique [0002] Acrylic thickeners are lightly cross-linked acrylic polymers that provide surfactant systems with excellent stability, thickening properties, and excellent suspension even in low viscosity formulations. From the perspective of chemical structure, the main chain or grafted side chain of acrylic polymer contains hydrophilic groups, such as: carboxyl, amide, sulfonic acid groups, etc. Most acrylic thickeners are anionic thickeners, which generally have a thickening effect after being neutralized with alkali. [0003] Acrylic thickeners can be divided into non-associative and associative types according to the thickening mechanism. Non-associative thickeners are generally water-soluble polymers, such as hydroxyethyl cellulose and polyacryli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/02C08F283/06C08F220/18
CPCC08F265/02C08F283/065C08F220/1818C08F220/1812
Inventor 沈惠
Owner 贵州省欣紫鸿药用辅料有限公司
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