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Preparation method and application of photo-cured polyurethane with self-healing property and shape memory property

A polyurethane and self-healing technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy aging, short service life of polymer materials, and less research on crystal side chain self-healing, and achieve the effect of repairing cracks

Inactive Publication Date: 2022-03-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to its shape deformation ability and recovery ability under external stimuli, shape memory polymers can be used as smart materials in many fields, but they are prone to aging, and various damages lead to the use of polymer materials. Short life, so the ability to self-heal requires more applications in shape memory polymers
[0003] At present, many self-healing polymers mainly achieve self-healing ability through functional groups, but there are few studies on self-healing through crystal side chains.

Method used

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  • Preparation method and application of photo-cured polyurethane with self-healing property and shape memory property
  • Preparation method and application of photo-cured polyurethane with self-healing property and shape memory property
  • Preparation method and application of photo-cured polyurethane with self-healing property and shape memory property

Examples

Experimental program
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Effect test

preparation example Construction

[0032] (1) Preparation of quaternized dihydroxyethylene glycol: get 1.19g (0.01mol) N-methyldiethanolamine (MDEA) and 3.94g (0.01mol) bromodocosane in a three-necked flask, set the temperature At 100°C, the reaction was stirred for 12 hours to obtain quaternized dihydroxyethylene glycol (0.01mol).

[0033] (2) Preparation of polyurethane hard segment: Take 5.13g (0.01mol) of quaternized dihydroxyethylene glycol and 3.36g (0.02mol) of hexamethylene diisocyanate (HDI) into a three-necked flask for mixing, drop 3-4 Drop dibutyltin dilaurate (DBTDL) and react at 60°C for 2 hours. When the NCO value reaches the theoretical value, the reaction is stopped to obtain a polyurethane hard segment component, which is recorded as product 1 (0.01mol).

[0034] (3) Preparation of polyurethane soft segment: Take 2.91g (0.015mol) tetraethylene glycol (TEG) and 1.68g (0.01mol) hexamethylene diisocyanate (HDI) into a three-necked flask, drop 3-4 drops of dilaurel Dibutyltin dibutyltin (DBTDL) w...

Embodiment 1

[0039] (4) Preparation of UV-cured polyurethane: Take 7.64g (0.009mol) of product 1 and 0.46g (0.001mol) of product 2 into a three-necked flask, add 3-4 drops of dibutyltin dilaurate (DBTDL), at 60°C After reacting for 2 hours, 2.21 g (0.017 mol) of hydroxyethyl methacrylate (HEMA) was added, and the reaction was continued for 2 hours to obtain a polyurethane emulsion.

[0040] (5) Curing of polyurethane: Take 5g of polyurethane emulsion, add 0.25g of 1173 photoinitiator, stir and coat on the sample plate, put it on a UV curing machine to cure for 30-60s, and then get UV cured with self-healing properties and shape memory Resistant polyurethane PU1.

Embodiment 2

[0042] (4) Preparation of UV-cured polyurethane: Take 6.79g (0.008mol) of product 1 and 0.92g (0.002mol) of product 2 into a three-necked flask, add 3-4 drops of dibutyltin dilaurate (DBTDL), at 60°C After reacting for 2 hours, 1.82 g (0.014 mol) of hydroxyethyl methacrylate (HEMA) was added, and the reaction was continued for 2 hours to obtain a polyurethane emulsion.

[0043] (5) Curing of polyurethane: Take 5g of polyurethane emulsion, add 0.25g of 1173 photoinitiator, stir and coat on the sample plate, put it on a UV curing machine to cure for 30-60s, and then get UV cured with self-healing properties and shape memory Resistant polyurethane PU2.

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Abstract

The invention relates to a preparation method and application of light-cured polyurethane with self-healing property and shape memory property, and belongs to the technical field of preparation of light-cured polyurethane. The preparation method comprises the following steps: firstly preparing quaternized dihydroxy ethylene glycol, then respectively preparing a polyurethane soft segment and a polyurethane hard segment, preparing a polyurethane emulsion through a reaction between the soft segment and the hard segment, and carrying out light curing to obtain polyurethane with self-healing property and shape memory property. The method provided by the invention can be used for preparing the light-cured polyurethane with self-healing property and shape memory ability. The polyurethane has excellent performance in the aspects of shape memory ability and heat-induced self-healing property, and can be applied to the fields of intelligent coatings, self-repairing coatings and the like.

Description

technical field [0001] The invention relates to a preparation method and application of photocured polyurethane with self-healing properties and shape memory, and belongs to the technical field of photocured polyurethane preparation. Background technique [0002] Due to its shape deformation ability and recovery ability under external stimuli, shape memory polymers can be used as smart materials in many fields, but they are prone to aging, and various damages lead to the use of polymer materials. The short lifespan, so the ability to self-heal requires more applications in shape memory polymers. [0003] At present, many self-healing polymers mainly achieve self-healing ability through functional groups, but there are few studies on self-healing through crystal side chains. The brush polymer can provide the chain structure required for recombination after injury. When a polymer is physically damaged, cracks can be repaired by external stimuli around the damaged cracks. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/67C09D175/16
CPCC08G18/3275C08G18/3206C08G18/672C08G18/673C09D175/16C08G2280/00C08G2150/00
Inventor 姚伯龙姚旭安炳辉宋健曹小凤王利魁
Owner JIANGNAN UNIV
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