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High-strength silicon dioxide and clay dual nano-composite hydrogel and preparation method thereof

A silica and nano-composite technology, applied in the field of organic/inorganic nano-composite materials, can solve problems such as the limitation of dispersion degree, easy formation of aggregation, gel strength restriction, etc., and achieve the effect of excellent mechanical properties and simple preparation process

Inactive Publication Date: 2015-04-22
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of clay (or silica) is large, the degree of dispersion in the final hydrogel is limited due to the strong interaction between clay sheets (or silica particles), and it is easy to form aggregates. , resulting in poor compatibility between the organic and inorganic phases, thus restricting the improvement of the gel strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Disperse 0.2 g lithium diatomaceous earth in 10.0 g water, stir to obtain a uniform transparent dispersion; then add 5.0 g acrylamide, 8.6 g methacrylic acid and 1.0 g γ-methacryloxypropyltrimethoxysilane; Stir until evenly dispersed; then add 2.0 mL of initiator 5 wt% potassium persulfate aqueous solution, stir well and place in 50 o The dual nanocomposite hydrogel was obtained after reacting in a C water bath for 48 h. Its compressive strength is 72.9 MPa.

Embodiment 2

[0018] With embodiment 1. The silica precursor chosen was γ-methacryloxypropyltrimethoxysilane (3.0 g). The compressive strength of the gel is 69.7 MPa.

Embodiment 3

[0020] With embodiment 1. The monomers chosen were acrylamide (5.7 g) and methacrylic acid (4.3 g). The compressive strength of the gel is 69.8 MPa.

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Abstract

The invention relates to a high-strength silicon dioxide and clay dual nano-composite hydrogel and a preparation method thereof. The preparation method is characterized by comprising the following steps: adding a monomer and a silicon dioxide precursor into clay aqueous dispersion liquid with mass percentage concentration of 1-15%, and stirring at normal temperature until uniformly dispersing; then adding an initiating agent, and stirring to be uniform; and reacting mixed liquid for 5-48 hours at 20-90 DEG C until a nano-composite hydrogel is formed, wherein the mass of the clay accounts for 1-30% of the mass of the monomer, the mass of the silicon dioxide precursor accounts for 1-50% of the mass of the monomer, and the mass of the initiating agent accounts for 0.5-2% of the mass of the monomer. The dual nano-composite hydrogel provided by the invention is simple in preparation method and high in gel strength, and ensures that the needs of more fields can be met.

Description

technical field [0001] The invention relates to a high-strength silicon dioxide and clay dual nanocomposite hydrogel and a preparation method thereof. It belongs to the technical field of organic / inorganic nanocomposite materials. Background technique [0002] Hydrogel is a kind of slightly cross-linked hydrophilic functional polymer, which can be used in agriculture, gardening, medicine and health, artificial tissue, separation engineering and other fields. Traditional hydrogels are mostly made of acrylic acid, acrylamide or their derivatives through chemical cross-linking polymerization. The application fields of hydrogels are largely limited due to their poor mechanical properties and prone to fragmentation. Therefore, the design and synthesis of high-strength hydrogels has always been one of the hot research topics. In recent years, a variety of new structural hydrogels with good mechanical properties have been designed and developed, such as topological hydrogels, do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F2/44C08K3/36C08K3/34C08J3/075
Inventor 徐世美杜娟封顺
Owner XINJIANG UNIVERSITY
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