High-gel strength, salt resistant amphoteric ion type nano-composite hydrogel and preparing method

Abstract

The invention relates to high-strength-gel and salt-resistant zwitterionic nano-composite hydrogel and a preparation method thereof. The hydrogel consists of a polymer matrix accounting for 60 to 100 weight percent of the gel and inorganic components accounting for 0 to 40 weight percent of the gel. The preparation method is that prepolymerization reaction solution is firstly prepared; the inorganic components are dispersed and stripped in deionized water to form even and stable colloidal dispersion; and then monomer is dissolved in the deionized water to prepare into monomer solution with 30 percent to 100 percent of mass concentration; when being stirred, the monomer solution is added into the colloidal dispersion, and then a crosslinking agent, an initiator and a catalyst are added in to prepare the prepolymerization reaction solution; under the nitrogen condition and 20 DEG C to 60 DEG C, the prepolymerization reaction solution is polymerized for 12 to 30 hours to obtain a polymerization product; and then the polymerization product is treated for 3 to 7 days under 40 DEG C to 60 DEG C; the mechanical strength of the gel after the obtained hydrogel absorbs water is up to 225mJ / g, and the salt absorbing magnification is up to 140g / g.

Description

technical field [0001] The invention relates to a high gel strength, salt-tolerant zwitterionic nanocomposite hydrogel and a preparation method thereof. Background technique [0002] Polymer hydrogel is a special functional polymer, which has a unique three-dimensional network structure and can absorb a large amount of solvent without losing it easily. This makes it widely used in agriculture, industry, biomedicine and tissue engineering. [0003] However, the poor mechanical strength of hydrogel greatly limits its application. However, relying on increasing the amount of organic cross-linking agent to enhance the gel strength of the hydrogel usually makes the hydrogel very brittle. Therefore, the preparation of nanocomposite hydrogels with high gel strength by the method of organic / inorganic nanocomposites is of great significance in both theory and application. Among the organic / inorganic hybrid hydrogels reported in the literature, most of the work that can better impr...

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Problems solved by technology

However, since the nanocomposite hydrogel prepared by this method only contains non-ionic monomer acrylamide, the absorption capacity of the gel is low.