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Self-repairing polyurethane hydrogel and preparation method thereof

A technology of polyurethane and hydrogel, applied in the field of preparation of polyurethane hydrogel, can solve the problems of inability to achieve multiple repairs, complex preparation process, affecting transparency, etc., and achieves improved physical and mechanical strength, simple synthesis route, and improved the effect of strength

Inactive Publication Date: 2014-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the microcapsule method is complicated and costly, and it cannot be repaired multiple times; the self-repair of the thermal reversible method requires a specific environment and will affect the transparency; the Chinese invention patent CN102153856B discloses a photoreversible self-healing polyurethane film. Cracks need to be repaired under the conditions of 350nm ultraviolet light irradiation for 10 to 200 minutes or sunlight irradiation for 3 to 5 hours, that is, the stimulation of external conditions is required to achieve repair
There is no relevant literature report on self-healing polyurethane hydrogel

Method used

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  • Self-repairing polyurethane hydrogel and preparation method thereof
  • Self-repairing polyurethane hydrogel and preparation method thereof
  • Self-repairing polyurethane hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Synthesis of polyethylene glycol acrylate-terminated hydrophilic polyurethane macromers: in terms of mass fraction, first add 50 parts of polyethylene glycol, 0.5 parts of 1,4-butanediol and 1 part of trimethylolpropane to 250 mL In the Erlenmeyer flask, stir evenly, heat up to 120-130°C, keep the vacuum degree above 0.08MPa and dehydrate for 2.5 hours, place it to lower the temperature to 60°C; then, add 14.5 parts of isophorone diisocyanate dropwise After the addition, the temperature was controlled to react at 70-85°C for 3 hours, and the mass content of -N=C=O in the prepolymer was measured by di-n-butylamine titration. When the actual measured value is close to the theoretical value, add 23.5 parts of polyethylene glycol acrylate and 2 parts of dibutyltin dilaurate drop by drop, and react for 24 hours; use infrared to track the consumption of isocyanate groups, and wait until the infrared characteristic peaks basically disappear So far, the polyethylene glycol acry...

Embodiment 2

[0053] Preparation of self-healing polyurethane hydrogel: In terms of mass fraction, 89.5 parts of polyethylene glycol acrylate-terminated hydrophilic polyurethane macromers prepared in Example 1 and 5 parts of HEMA‐UPy monomers were dissolved in In dimethyl sulfoxide, under the condition of avoiding light, add 2 parts of photoinitiator 2959, stir until completely dissolved; The free radical polymerization reaction was carried out in a UV oven for 1 hour under photoinitiation; then, the product was taken out and placed in deionized water, and the water was changed every 12 hours for 6 consecutive days, and the prepared polyurethane hydrogel could be taken out.

[0054] The mechanical properties and self-healing properties of the obtained polyurethane hydrogel are equivalent to those of the polyurethane hydrogel obtained in Example 1.

Embodiment 3

[0056] Preparation of self-healing polyurethane hydrogel: in terms of mass fraction, 89.5 parts of polyethylene glycol acrylate-terminated hydrophilic polyurethane macromers prepared in Example 1 and 10 parts of PEGMA-UPy monomers were dissolved in In dimethyl sulfoxide, under the condition of avoiding light, add 2 parts of photoinitiator 2959, stir until completely dissolved; The free radical polymerization reaction was carried out in a UV oven for 1 hour under photoinitiation; then, the product was taken out and placed in deionized water, and the water was changed every 12 hours for 6 consecutive days, and the prepared polyurethane hydrogel could be taken out.

[0057] The mechanical properties and self-healing properties of the obtained polyurethane hydrogel are equivalent to those of the polyurethane hydrogel obtained in Example 1.

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Abstract

The invention relates to a self-repairing polyurethane hydrogel and a preparation method thereof. The polyurethane hydrogel comprises the following components in parts by mass: 10-30 parts of polyisocyanate, 30-50 parts of hydrophilic polyester polyol or hydrophilic polyether polyol, 10-50 parts of acrylamide monomer, 0.5-3 parts of chain extender, 3-10 parts of methacrylic acid functional monomer containing an UPy unit, 0.5-2 parts of catalyst and 0.5-3 parts of photoinitiator. The preparation method comprises the following steps of firstly preparing a hydrophilic polyurethane macromonomer terminated with an acrylic acid monomer and carrying out radical polymerization with the methacrylic acid functional monomer containing the UPy unit under the action of photo-initiation. According to the self-repairing polyurethane hydrogel, the self-repairing of the damage of the polyurethane hydrogel can be completed without need of any repairing agent or specific environmental requirements, the polyurethane hydrogel has the advantages of high repairing efficiency, high mechanical strength and low cost and the repeatedly repairing function can be achieved on the same site.

Description

technical field [0001] The invention relates to a preparation method of polyurethane hydrogel, in particular to a preparation method of self-repairing polyurethane hydrogel. Background technique [0002] Polyurethane (PU) is a general term for a class of polymer compounds whose main chain contains carbamate (-NH-COO-) units. It is a multi-block polymer formed by the gradual polymerization of polyols, small molecule chain extenders and polyisocyanates polymer. The polyol constitutes the soft segment, and the small molecule chain extender and polyisocyanate constitute the hard segment. By adjusting the composition and ratio of the soft and hard segments, the molecular structure and physical and chemical properties of polyurethane can be effectively controlled. The polarity of the hard segment is strong, and it is easy to aggregate; the hard segment and the soft segment can produce microphase separation due to thermodynamic incompatibility. The microphase separation structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/36C08G18/67C08G18/48
Inventor 李光吉林殷雷王立莹
Owner SOUTH CHINA UNIV OF TECH
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