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N-vinyl amides polymer and laponite composite hydrogel and preparation method

A vinylamide and composite hydrogel technology, applied in the field of composite hydrogels, can solve the problems of low strength, poor toughness, and decreased mechanical properties, etc.

Inactive Publication Date: 2010-06-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional polymer hydrogels (hereinafter referred to as OR gels) have the following defects: low strength and poor toughness, and can only be used in fields that require very low gel strength, which greatly affects the performance of polymer hydrogels. scope of application
But so far, only these two kinds of acrylamides can successfully prepare lithium diatomaceous earth nanocomposite hydrogels, and these two hydrogels are either lithium diatomaceous earth or monomers when the water content is high (≥80%). When the content is low (≤10%), the mechanical properties will still decline considerably

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, disperse 2g of Laponte XLS in 100g of high-purity water, stir for 4 hours to obtain a uniform and transparent dispersion, then add 10g of N-vinylacetamide monomer and 0.04g of V-50 initiator in sequence, stir evenly, and then drive oxygen Transfer to a glass test tube and seal it, and the reaction initiation method is to place it in a 40-60°C water bath and heat it for 36 hours to obtain a nanocomposite hydrogel with high mechanical properties, good transparency, and easy dyeing; the prepared hydrogel- Part is used for the measurement of mechanical properties by universal material testing machine and the measurement of light transmittance by spectrophotometer. The elongation at break of this part of the nanocomposite hydrogel is 1200%, the breaking strength is 33.0kPa, the light transmittance is 90.0%, and the moisture content is 90.0%. 88.0%; the other part is placed in a large amount of high-purity water and soaked for 15-20 days, and the water is changed regula...

Embodiment 2

[0032] The present embodiment is the same as embodiment 1 except the following features: the added lithium diatomaceous earth is 6g. The elongation at break of the nanocomposite hydrogel is 2400%, the breaking strength is 260kPa, the light transmittance is 65%, and the water content is 84%; the elongation at break of this part of the nanocomposite hydrogel after the swelling balance is 1200%, The breaking strength is 150.0kPa, the light transmittance is 85%, and the swelling ratio is 27.0 (the water content is 96%).

Embodiment 3

[0034] The present embodiment is the same as embodiment 1 except the following features: 10 g of lithium diatomaceous earth is added. The elongation at break of the nanocomposite hydrogel is 2500%, the breaking strength is 830kPa, the light transmittance is 70%, and the water content is 80%; the elongation at break of this part of the nanocomposite hydrogel after the swelling balance is measured is 1800%, Breaking strength 350.0kPa, light transmittance 80%, swelling ratio 13.0 (water content 92%).

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Abstract

The invention provides a preparation method of high-strength and high-tenacity N-vinyl amides polymer and laponite composite hydrogel, which comprises the following steps of: dispersing laponite in water, stirring to obtain a uniform and transparent dispersing solution, then sequentially adding a N-vinyl amides monomer, an initiator and a water-soluble dye, uniformly stirring, deoxidizing and sealing; heating a reaction system for reacting to obtain laponite cross-linked nano-composite hydrogel; or placing the reaction system in a thermostatic environment, illuminating the obtained laponite cross-linked nanocomposite hydrogel by using an UV (ultraviolet) light. By dispersing the laponite in the water fully, adding the N-vinyl amides monomer and the initiator, selecting a water-bath heating mode or an UV light induced reaction mode, and adopting an in-situ free radical polymerization method, the invention obtains the hydrogel with a high-strength and high-tenacity N-vinyl amides polymer and laponite nano-composite structure.

Description

technical field [0001] The invention relates to a composite hydrogel, in particular to a high-strength and high-toughness N-vinylamide polymer-lithium composite hydrogel and a preparation method thereof. Background technique [0002] Polymer hydrogel is widely used in petrochemical, food and biomedical engineering fields, such as: crude oil / refined oil dehydrating agent, oil well water plugging and water diversion, food additives, drug controlled release and biological tissue filling materials, etc. , has received widespread attention and research. However, traditional polymer hydrogels (hereinafter referred to as OR gels) have the following defects: low strength and poor toughness, and can only be used in fields that require very low gel strength, which greatly affects the performance of polymer hydrogels. scope of application. [0003] According to the literature (Adv. Mater., 2002, 14: 1120-1124), Haraguchi et al. dispersed lithium almond earth (Laponite) nanoparticles ...

Claims

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Application Information

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IPC IPC(8): C08F26/02C08F126/02C08K9/02C08K3/34C08J3/075C08L39/00
Inventor 刘新星童真裴煜
Owner SOUTH CHINA UNIV OF TECH
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