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A kind of preparation method of temperature and pH sensitive guar gum/starch composite hydrogel

A technology of composite hydrogel and guar gum, applied in the field of gel materials, can solve the problems of single function of hydrogel, insufficient drawing performance, good viscosity, etc., and achieve good pH value sensitivity, good temperature sensitivity, The effect of excellent mechanical properties

Active Publication Date: 2022-04-22
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that existing starch hydrogels or guar gum hydrogels have good viscosity, insufficient drawing performance, poor viscosity, difficult molding, relatively loose, and single functions in most hydrogels, the present invention Provided is a kind of preparation method of temperature- and pH-sensitive guar gum / starch composite hydrogel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of preparation method of temperature and pH sensitive guar gum / starch composite hydrogel,

[0051] The preparation method comprises the following preparation steps:

[0052] 1) Preparation of A solution:

[0053] Select polyvinyl alcohol of 1788 specification, dissolve polyvinyl alcohol in water, prepare polyvinyl alcohol aqueous solution, add oil-soluble cross-linking agent, mix to form polyvinyl alcohol emulsion, wherein the concentration of polyvinyl alcohol is 2wt%, oil-soluble cross-linking Dosage is 5wt% of polyvinyl alcohol;

[0054] Boric acid and guar gum are dissolved in water to be prepared as a guar gum pre-solution, wherein the guar gum concentration is 6wt%, and the pH value is 6; the pH value of the polyvinyl alcohol emulsion is adjusted to 9 by using sodium hydroxide, and then the polyethylene Alcohol emulsion and guar gum pre-solution are mixed uniformly at a volume ratio of 1:1 to obtain A solution;

[0055] 2) Preparation of B solution:

[...

Embodiment 2

[0063] A kind of preparation method of temperature and pH sensitive guar gum / starch composite hydrogel,

[0064] The preparation method comprises the following preparation steps:

[0065] 1) Preparation of A solution:

[0066] Select polyvinyl alcohol of 1788 specification, dissolve polyvinyl alcohol in water, prepare polyvinyl alcohol aqueous solution, add oil-soluble cross-linking agent, mix to form polyvinyl alcohol emulsion, wherein the concentration of polyvinyl alcohol is 5wt%, oil-soluble cross-linking The dosage is 20wt% of polyvinyl alcohol;

[0067] Boric acid and guar gum are dissolved in water to be prepared as a guar gum pre-solution, wherein the guar gum concentration is 9wt%, and the pH value is 4; the pH value of the polyvinyl alcohol emulsion is adjusted to 10 by using sodium hydroxide, and then the polyethylene Alcohol emulsion and guar gum pre-solution are mixed uniformly at a volume ratio of 1:3 to obtain A solution;

[0068] 2) Preparation of B solution...

Embodiment 3

[0076] A kind of preparation method of temperature and pH sensitive guar gum / starch composite hydrogel,

[0077] The preparation method comprises the following preparation steps:

[0078] 1) Preparation of A solution:

[0079] Select polyvinyl alcohol of 1788 specification, dissolve polyvinyl alcohol in water, prepare polyvinyl alcohol aqueous solution, add oil-soluble cross-linking agent, mix to form polyvinyl alcohol emulsion, wherein the concentration of polyvinyl alcohol is 3wt%, oil-soluble cross-linking Dosage is 12wt% of polyvinyl alcohol;

[0080] Boric acid and guar gum are dissolved in water to be prepared as a guar gum pre-solution, wherein the guar gum concentration is 7wt%, and the pH value is 5; the pH value of the polyvinyl alcohol emulsion is adjusted to 9 by using sodium hydroxide, and then the polyethylene The alcohol emulsion and the guar gum pre-solution are mixed uniformly at a volume ratio of 1:2 to obtain the A solution;

[0081] 2) Preparation of B s...

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Abstract

The invention relates to the field of gel materials, in particular to a preparation method of a temperature- and pH-sensitive guar gum / starch composite hydrogel. The preparation method comprises the following steps: preparing A solution with polyvinyl alcohol, oil-soluble crosslinking agent, boric acid and guar gum; Alcohol and sulfohydroxypropyl guar gum are used as raw materials to prepare solution B; colloidal liquid of carboxymethyl starch is prepared, and the three are mixed and then cross-linked to form a composite hydrogel. The preparation method of the invention is simple and efficient, does not need complex equipment, can realize the functionalization of the composite hydrogel, and has good temperature sensitivity and pH value sensitivity at the same time; the prepared composite hydrogel has better mechanical properties, Not easy to break.

Description

technical field [0001] The invention relates to the field of gel materials, in particular to a preparation method of a temperature- and pH-sensitive guar gum / starch composite hydrogel. Background technique [0002] As the most viscous natural polymer polysaccharide in nature, guar gum has a very wide application value, but due to the limitation of the physical and chemical properties of guar gum itself, guar gum is usually modified to expand its application field. Carboxymethyl starch has the characteristics of non-toxicity, good biocompatibility and high biodegradability. If guar gum or carboxymethyl starch is used alone to prepare hydrogel, guar gum has good viscosity, but the drawability is insufficient. Carboxymethyl starch has poor viscosity, but it can be easily mixed and has a certain degree of stretching. . If you mix the two, you can overcome these shortcomings. [0003] At present, there is no report on combining starch and guar gum to form a composite hydrogel....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J3/24C08L3/08C08L5/00C08L29/04
CPCC08J3/075C08J3/24C08J2303/08C08J2405/00C08J2429/04
Inventor 周英棠
Owner ZHEJIANG OCEAN UNIV