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Temperature and pH dual-stimulus responsive intelligent polymer microcapsule and preparation method thereof

A stimuli-responsive, smart polymer technology, applied in the field of smart polymers, can solve the problems of uneven pore size and size of polymers, and achieve the effects of solving the problem of uneven pore size and size, easy operation, and simple preparation method

Inactive Publication Date: 2019-04-05
NANJING GAOZHENG AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a temperature and pH dual stimulus responsive smart polymer microcapsule, and obtain a kind of microcapsule that can respond to both temperature stimulus and pH stimulus. Advanced smart polymer microcapsules to solve the problem of uneven polymer pore size and size

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] Simultaneously, the preparation method of a kind of temperature and pH dual stimulus responsive intelligent polymer microcapsule of the present invention comprises the following steps:

[0037] (1) Add liquid paraffin, ammonia water, nano-silica, and water into anhydrous ethanol solvent, mix evenly, and stir to obtain an ethanol dispersion of silica nanoparticles, then add a surface modifier, and stir;

[0038] (2) Add polyethylene glycol, polyhydroxy carboxylic acid, and polyisocyanate to the ethanol dispersion of silica nanoparticles modified in step (1), stir, and pass nitrogen gas to remove oxygen;

[0039] (3) Add the solidified cross-linking agent to the solution obtained in step (2), stir, and freeze-dry.

Embodiment 1

[0041] A smart polymer microcapsule with temperature and pH dual stimuli responsiveness of the present invention is prepared from the following ingredients in parts by weight:

[0042] 1 part of silicon dioxide, 20 parts of polyethylene glycol, 10 parts of polyhydroxy carboxylic acid, 30 parts of polyisocyanate, 15 parts of curing crosslinking agent. The particle diameter of the obtained polymer microcapsule is 3000nm.

[0043] Simultaneously, the preparation method of a kind of temperature and pH dual stimulus responsive intelligent polymer microcapsule of the present invention comprises the following steps:

[0044] (1) Add 5g of liquid paraffin, 50mL of ammonia water with a concentration of 0.5 mol / L, 1.12g of nano-silicon dioxide, and 50mL of water into 100mL of absolute ethanol solvent, mix well, and stir to obtain an ethanol dispersion of silica nanoparticles. Then add 0.13g 3-trimethoxysilyl propyl methacrylate, stir;

[0045] (2) Add 22.4g of polyethylene glycol, 11....

Embodiment 2

[0056] A smart polymer microcapsule with temperature and pH dual stimuli responsiveness of the present invention is prepared from the following ingredients in parts by weight:

[0057] 5 parts of silicon dioxide, 25 parts of polyethylene glycol, 15 parts of polyhydroxy carboxylic acid, 40 parts of polyisocyanate, 20 parts of curing crosslinking agent. The particle diameter of the obtained polymer microcapsule is 5000nm.

[0058] Simultaneously, the preparation method of a kind of temperature and pH dual stimulus responsive intelligent polymer microcapsule of the present invention comprises the following steps:

[0059] (1) Add 10g of liquid paraffin, 50mL of ammonia water with a concentration of 1 mol / L, 5.6g of nano-silicon dioxide, and 100mL of water into 100mL of absolute ethanol solvent, mix well, and stir to obtain an ethanol dispersion of silica nanoparticles. Then add 0.47g 3-trimethoxysilyl propyl methacrylate, stir;

[0060] (2) Add 28g of polyethylene glycol, 16.8g...

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Abstract

The invention discloses a temperature and pH dual-stimulus responsive intelligent polymer microcapsule and a preparation method thereof and solves the problem of nonuniformity in polymer pore diameterand size. The method includes steps: (1) adding liquid paraffin, ammonium hydroxide, nano silicon dioxide and water into an absolute ethyl alcohol solvent, well mixing, stirring to obtain silicon dioxide nanoparticle ethyl alcohol dispersion liquid, adding a surfactant, and stirring; (2) adding polyethylene glycol, polyhydroxy carboxylic acid and polyisocyanate into the silicon dioxide nanoparticle ethyl alcohol dispersion liquid modified in the step (1), stirring, and feeding nitrogen for deoxidizing; (3) adding a curing cross-linking agent into solution obtained in the step (2), stirring, and performing freeze drying. The intelligent polymer microcapsule is responsive to thermal stimuli and pH stimuli, and the problem of polymer pore diameter and size nonuniformity caused by copolymerization of thermosensitive chains and pH-sensitive chains is solved.

Description

technical field [0001] The invention relates to a temperature- and pH-stimulus-responsive intelligent polymer microcapsule and a preparation method thereof, belonging to the technical field of intelligent polymers. Background technique [0002] Stimuli-responsive smart polymers refer to a class of polymers that undergo physical or chemical changes when the external environmental conditions change. This kind of polymer is widely used in various fields such as cosmetics, medicine, petrochemical industry because of its excellent performance. [0003] In the past, the research on smart polymers with single stimuli responsiveness has been concentrated, but with the expansion of application directions and the diversity requirements of application fields, the research on smart polymers with dual responsiveness is increasingly carried out. In practical applications, since temperature and pH in the environment are essential factors, there are more and more studies on temperature- an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/34C08K3/36B01J13/14
CPCB01J13/14C08G18/348C08G18/4833C08G18/6692C08K3/36
Inventor 王欣欣
Owner NANJING GAOZHENG AGROCHEM