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Polyvinyl alcohol mircrobubbles and preparing method thereof

A technology of polyvinyl alcohol and microbubbles, which is applied in the field of polyvinyl alcohol microbubbles and its preparation, can solve the problems of poor particle size uniformity, long time consumption, and large product particle size, and achieve shortened preparation time and high application efficiency , the effect of less impurity content

Active Publication Date: 2014-04-16
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: (1) The preparation steps of this method are cumbersome and time-consuming, which reduces the application efficiency of polymer microbubbles; (2) Since an emulsifier needs to be added during the preparation process, the emulsifier is not easy to be washed, and it is easy to Residues in polymer microbubbles lead to impurity of the obtained product, which limits the subsequent application of polymer microbubbles; (3) The particle size of the obtained product is large and the particle size uniformity is not good

Method used

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  • Polyvinyl alcohol mircrobubbles and preparing method thereof
  • Polyvinyl alcohol mircrobubbles and preparing method thereof
  • Polyvinyl alcohol mircrobubbles and preparing method thereof

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Experimental program
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preparation example Construction

[0029] The first aspect of the present invention provides a kind of preparation method of polyvinyl alcohol microbubble, comprises the following steps:

[0030] (1) Dissolving polyvinyl alcohol in a solvent to obtain an aqueous solution of polyvinyl alcohol, then adding an oxidizing agent to the aqueous solution of polyvinyl alcohol and fully heating and stirring, the two vinyl alcohol units connected head to head in the main chain of polyvinyl alcohol The hydroxyl group in the product is oxidized to form an aldehyde group and the chain is broken to obtain an aqueous solution containing polyvinyl alcohol chain scission products, and the oxidizing agent is selected from at least one of sodium periodate, potassium metaperiodate and sodium metaperiodate ;

[0031] (2) Add acid to the aqueous solution containing polyvinyl alcohol chain scission products to adjust the pH value to 1-4 to obtain a mixed solution, and then stir, and the polyvinyl alcohol chain scission products in the...

Embodiment 1

[0056] (1) Take 0.1g of polyvinyl alcohol with a weight average molecular weight of 30000g / mol and dissolve it in 10mL of distilled water to obtain a polyvinyl alcohol aqueous solution with a polyvinyl alcohol concentration of 0.02g / mL, and heat the polyvinyl alcohol aqueous solution to 80°C in a water bath , and maintain it for 1 hour; when the polyvinyl alcohol is fully dissolved, lower the temperature and maintain it at 60°C, add sodium periodate (Na 5 IO 6 ) as an oxidant, the molar ratio of the oxidant to the polyvinyl alcohol in the polyvinyl alcohol aqueous solution is 1:50, stirring for 3 hours, the hydroxyl groups in the two vinyl alcohol units connected head to head in the polyvinyl alcohol main chain are oxidized into aldehyde groups After chain scission, an aqueous solution containing polyvinyl alcohol chain scission product is obtained;

[0057] (2) Add hydrochloric acid to the aqueous solution containing polyvinyl alcohol chain scission products to adjust the pH...

Embodiment 2

[0059] (1) Take 0.5g of polyvinyl alcohol with a weight average molecular weight of 30000g / mol, dissolve it in 10mL of distilled water to obtain a polyvinyl alcohol aqueous solution with a polyvinyl alcohol concentration of 0.02g / mL, and heat the polyvinyl alcohol aqueous solution to 80°C in a water bath , maintained for 4 hours; when the polyvinyl alcohol is fully dissolved, lower the temperature and maintain it at 60°C, add sodium periodate (Na 5 IO 6 ) as an oxidant, the molar ratio of the oxidant to the polyvinyl alcohol in the polyvinyl alcohol aqueous solution is 1:30, stirring for 3 hours, the hydroxyl groups in the two vinyl alcohol units connected head to head in the polyvinyl alcohol main chain are oxidized into aldehyde groups After chain scission, an aqueous solution containing polyvinyl alcohol chain scission product is obtained;

[0060] (2) Add hydrochloric acid to the aqueous solution containing polyvinyl alcohol chain scission products to adjust the pH to 2.5...

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Abstract

The invention provides polyvinyl alcohol mircrobubbles and a preparing method thereof. The method includes the following steps: firstly, dissolving polyvinyl alcohol in a solvent to obtain a polyvinyl alcohol water solution; then adding an oxidizing agent in the polyvinyl alcohol water solution and fully heating and stirring the mixture to enable hydroxide radicals in two vinyl alcohol units connected head to head to be oxidized into formyl groups and enable the formyl groups to be subjected to chain scission, so as to prepare a water solution containing polyvinyl alcohol chain scission products; then adding acid in the water solution containing the polyvinyl alcohol chain scission products and adjusting the pH value to 1-4, so as to obtain a mixed solution; stirring; enabling cross-linking reaction to occur between the polyvinyl alcohol chain scission products in the mixed solution to form microbubble films, so as to obtain polyvinyl alcohol mircrobubbles, as the solvent, wrapped by the microbubble films.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyvinyl alcohol microbubble and a preparation method thereof. Background technique [0002] Microbubbles generally refer to spherical materials with a diameter between 1 and 1000 microns, composed of microbubble membranes and gas filled in the membranes. Microbubbles have received extensive attention because of their special structure and size. At present, the materials used to prepare microbubbles mainly include surfactants, proteins, lipid compounds and polymers. [0003] At present, polymer microbubbles are generally prepared by emulsion polymerization. The specific steps are: after dissolving the polymer, adding an emulsifier for ultrasonic emulsification to obtain a primary emulsion (water / oil system), and then dropping the primary emulsion into In the external water phase containing an emulsifier, a double emulsion (water / oil / water system) is obtained, and then the dou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/00C08F116/06C08F8/06
Inventor 阮长顺蔡青青张勤蒋立新潘浩波
Owner SHENZHEN INST OF ADVANCED TECH
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