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PH and temperature double-sensitive intelligent nanogel and preparation method thereof

A dual-sensitivity, nano-gel technology, applied in the field of smart nano-gel and its preparation, pH and temperature dual-sensitivity smart nano-gel and its preparation, to improve the phase transition temperature, good water and salt absorption performance, high Effect of Gel Strength

Active Publication Date: 2015-02-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, at present, the nanogels prepared by inverse microemulsion polymerization at home and abroad are all pH-sensitive or temperature-sensitive nanogels. no relevant reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This embodiment provides a pH and temperature dual sensitive smart nanogel and its preparation method, the preparation method comprising the following steps:

[0067] Slowly add 4.0625 g of itaconic acid into 10 mL of 10% sodium hydroxide solution in an ice bath, stir well, and react for 0.5 h to obtain a partially neutralized itaconic acid aqueous solution;

[0068] Add 6.0938g of acrylamide, 1.7411g of N-isopropylacrylamide and 0.0595g of N,N'-methylenebisacrylamide into the partially neutralized itaconic acid aqueous solution, and stir evenly for 20min to obtain a transparent Monomer mixed solution;

[0069] Add the above-mentioned transparent monomer mixed solution into a three-necked flask equipped with 100g of cyclohexane, 4.8g of Span80 and 3.2g of Tween80, and stir evenly for 20min to form a transparent inverse microemulsion, and then gradually heat up to 40°C, Adding the ammonium persulfate of 0.0952g and the sodium bisulfite of 0.0434g initiates the inverse m...

Embodiment 2

[0073] This embodiment provides a pH and temperature dual sensitive smart nanogel and its preparation method, the preparation method comprising the following steps:

[0074] Slowly add 4.6429 g of itaconic acid into 20 mL of 10% sodium hydroxide solution in an ice bath, stir well, and react for 2 hours to obtain a partially neutralized itaconic acid aqueous solution;

[0075] Add 4.6429g of acrylamide, 10.8334g of N-isopropylacrylamide and 0.1207g of ethylene glycol diacrylate to the partially neutralized itaconic acid aqueous solution, and stir evenly for 40min to obtain a transparent monomer mixed solution;

[0076] Add the above-mentioned transparent monomer mixed solution into a three-necked flask equipped with 100g of liquid paraffin, 10.6667g of Span80 and 5.3333g of Tween80, and stir evenly for 40min to form a transparent inverse microemulsion, then gradually heat up to 60°C, add Potassium persulfate of 0.0805g and sodium formaldehyde sulfoxylate of 0.0230g initiate the...

Embodiment 3

[0080] This embodiment provides a pH and temperature dual sensitive smart nanogel and its preparation method, the preparation method comprising the following steps:

[0081] Slowly add 2.7083 g of itaconic acid into 10 mL of 10% sodium hydroxide solution in an ice bath, stir well, and react for 1.5 h to obtain a partially neutralized itaconic acid aqueous solution;

[0082] Add 1.8055g of acrylamide, 1.1607g of N-isopropylacrylamide and 0.0057g of polyethylene glycol diacrylate into the partially neutralized itaconic acid aqueous solution, and stir evenly for 30min to obtain a transparent monomer mixed solution ;

[0083] Add the above transparent monomer mixed solution into a three-necked flask equipped with 100g of white oil, 9.6g of Span80 and 6.4g of Tween80, and stir evenly for 30min to form a transparent inverse microemulsion, then gradually heat up to 50°C, add The ammonium persulfate of 0.0681g and the sodium sulfite of 0.0342g initiate the reverse phase microemulsion...

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Abstract

The invention provides a pH and temperature double-sensitive intelligent nanogel and a preparation method thereof. The method comprises the following steps: adding ltaconic acid into sodium hydroxide solution to obtain partially neutralized ltaconic acid water solution; adding acrylamide, N-isopropyl acrylamide and a crosslinking agent into the partially neutralized ltaconic acid water solution, and stirring to obtain a transparent single mixture solution; adding the transparent single mixture solution into a mixed solvent containing oil-soluble solvent and Span80 / Tween 80 composite surfactant, stirring, heating to 40-60DEG C, and adding an oxidant and a reducing agent, to obtain intelligent transparent or semitransparent nanogel reversed-phase microemulsion; demulsifying and precipitating the intelligent transparent or semitransparent nanogel reversed-phase microemulsion with ethanol, washing, drying and grinding to the pH and temperature double-sensitive intelligent nanogel. The invention further provides the pH and temperature double-sensitive intelligent nanogel prepared by adopting the preparation method. The pH and temperature double-sensitive intelligent nanogel has good pH and temperature double sensitivity.

Description

technical field [0001] The invention relates to an intelligent nano-gel and a preparation method thereof, in particular to a pH- and temperature-sensitive intelligent nano-gel and a preparation method thereof, belonging to the technical field of nano-materials and preparation. Background technique [0002] Intelligent nanogel (Intelligent nanogel) is a hydrogel particle with a particle size of 1-1000nm, which can undergo phase transition in response to external stimuli, so it is also called stimulus-responsive nanogel (Stimulus responsive nanogel). External stimuli usually include slight changes in ambient temperature, pH and ionic strength of the dispersion medium, as well as light, magnetic field, specific chemical substances or biological substances, etc. In the process of phase transition, the volume, water content, refractive index, colloidal stability, hardness, permeability of the internal gel network, and hydrophilic-hydrophobic properties of the smart nano-hydrogel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/02C08F220/56C08F220/54C08F2/30C08F4/40
Inventor 万涛谭雪梅胡俊燕邹矗张徐敏程文忠
Owner PETROCHINA CO LTD
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