Hydrogel with adjustable adhesion in wet environment and preparation and use methods of hydrogel

A technology of hydrogel and adhesion, which is applied in the field of hydrogel with adjustable adhesion, which can solve the problems of uncontrollable adhesion, weak adhesion and deformation of hydrogel

Active Publication Date: 2021-04-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies or defects, the purpose of the present invention is to provide a hydrogel with adjustable adhesion in a wet environment and its prepa

Method used

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  • Hydrogel with adjustable adhesion in wet environment and preparation and use methods of hydrogel
  • Hydrogel with adjustable adhesion in wet environment and preparation and use methods of hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment 1 provides a hydrogel with adjustable adhesion in a wet environment and its preparation and use method, which specifically includes the following process:

[0026] 1. Preparation of ureido ethyl methacrylate

[0027] Add 56 grams of 30% ammonia solution with a mass fraction of 10% to a three-necked flask and cool to 10°C, vacuumize to remove the air, pass nitrogen protection, and use nitrogen protection throughout the reaction, then use a constant pressure funnel to drop 155 grams of methacrylic acid isocyanide Ethyl ester, reacted for 2 hours after the dropwise addition, and then reacted for 10 hours at 25°C. As the reaction progressed, the reaction solution became uniform and transparent, and finally white crystals precipitated. The precipitated white crystals were filtered, dried in vacuo, washed several times with petroleum ether, and dried under reduced pressure to obtain 170 g of ureidoethyl methacrylate (yield: 90%).

[0028] 2. Preparation of hy...

Embodiment 2

[0033] This embodiment 2 provides a hydrogel with adjustable adhesion in a wet environment and its preparation and use method, which specifically includes the following process:

[0034] 1. Preparation of hydrogel

[0035] Mix 750 μL of monomer acrylonitrile, 750 μL of acrylic acid, 0.6 g of ureidoethyl methacrylate, and 0.1 g of polyethylene glycol with double bonds at both ends of the long-chain crosslinking agent. The solvent is 6 mL of dimethyl sulfoxide and thermal initiator Add 32 mg of azobisisobutyronitrile into a round bottom flask and mix evenly, then add it into a reaction pool consisting of a pair of glass plates, and react at a temperature of 70°C for 8 hours to obtain an organic gel, and then the prepared organic gel The gel was immersed in water for 3 days, and the water was changed every 12 hours, so that the dimethyl sulfoxide in the organic gel was completely replaced with an aqueous solution, and some residual chemical substances were washed away at the same...

experiment example 1

[0040] In order to investigate the adhesion performance of the hydrogel prepared in the present invention on different materials, the hydrogel prepared in Example 1 was tested in dry and wet environments respectively on glass material (Glass), poly Adhesion force on vinyl chloride material (PVC), polycarbonate material (PC), aluminum material (Al) and skin tissue (Skin). The flat side of the hydrogel was stuck on a glass slide, and the other side had microstructures with micropatterns, and the adhesion force between the side with microstructures and different materials was tested. Test results such as figure 1 as shown, figure 1 In the two sets of test data results of different materials, the first set is the data result in the dry environment, and the second set is the data result in the wet environment.

[0041] Depend on figure 1 It can be seen that the hydrogel prepared in Example 1 has the best adhesion on aluminum and polycarbonate materials, followed by polyvinyl chl...

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Abstract

The invention discloses hydrogel with adjustable adhesion in a wet environment and a preparation method and a use method of the hydrogel, and belongs to the technical field of hydrogel. Acrylonitrile, acrylic acid, methacrylic acid ureido ethyl ester, a cross-linking agent, an initiator and a solvent are added into a reaction mold to react for 6-9 hours at the temperature of 60-80 DEG C to prepare organic gel, and then the organic gel is put into water to obtain the hydrogel. The organic solvent is replaced with water to prepare the hydrogel. According to the invention, hydrogen bonds and dipole dipoles are introduced to interact to serve as temporary crosslinking points, so that the shape memory property of the hydrogel and the swelling resistance of the hydrogel in water are realized; then micro-patterns are constructed on the surface of the hydrogel, the surface drainage performance of the material is enhanced, wet adhesion of the hydrogel is achieved, finally, the surface microstructure is restored through the shape memory function, the hydrogel becomes a plane structure, the wet adhesion force of the hydrogel is reduced, and therefore regulation and control of the adhesion force of the hydrogel are achieved.

Description

technical field [0001] The invention relates to the field of hydrogel technology, in particular to a hydrogel with adjustable adhesion in a wet environment and a method for preparing and using the hydrogel. Background technique [0002] Hydrogel is a rapidly developing new type of material, which has attracted great attention in living organisms due to its advantages of high biocompatibility and promoting wound healing. At the same time, many smart hydrogels (such as stimuli-responsive hydrogels, shape-memory hydrogels, self-healing hydrogels, conductive hydrogels) have emerged in recent years for wearable and implantable electronic devices to collect and deliver Various bioelectrical signals from different parts of the human body, including skin, brain, etc., have greatly expanded the application range of hydrogels. At present, hydrogels are mainly used in wound dressings, medical adhesives, wearable devices, 3D printing, etc., all of which rely on the adhesion of hydrogel...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/48C08F220/34C08J3/075C08L33/02
Inventor 向韬张波贾良好周绍兵武珊珊向臻邵子健蒋锦锐尹天宇
Owner SOUTHWEST JIAOTONG UNIV
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