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A hydrogel with adjustable adhesion in wet environment and its preparation and use method

A technology of hydrogel and adhesion, which is applied in the field of hydrogel with adjustable adhesion, which can solve problems such as deformation, uncontrollable adhesion, and weak adhesion of hydrogel, so as to inhibit swelling and solve deformation , to achieve the effect of shape memory performance

Active Publication Date: 2021-11-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 preparation and use method, which can effectively solve the problem of the adhesion of existing hydrogels in a wet environment. Weak, uncontrollable adhesion and deformation due to swelling

Method used

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  • A hydrogel with adjustable adhesion in wet environment and its preparation and use method
  • A hydrogel with adjustable adhesion in wet environment and its preparation and use method

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Experimental program
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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 ureidoethyl 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 hyd...

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, and the solvent is 6 mL of dimethyl sulfoxide and thermal initiator Add 32 mg of azobisisobutyronitrile into a round-bottomed 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. 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 by an aqueous solution, and some residual chemical substances were washed away at the same time to obtain a hydrogel;

[0...

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 a hydrogel with adjustable adhesion in a wet environment and a preparation and use method thereof, belonging to the technical field of hydrogels. Add the initiator and solvent into the reaction mold, react at 60-80°C for 6-9 hours to obtain an organic gel, then place the organic gel in water, replace the organic solvent with water, and obtain a hydrogel . The present invention realizes the shape memory performance of the hydrogel and the anti-swelling performance of the hydrogel in water by introducing hydrogen bonds and dipole-dipole interactions as temporary cross-linking points; and then by constructing micropatterns on the surface of the hydrogel, Enhance the surface drainage performance of the material, realize the wet state adhesion of the hydrogel, and finally use the shape memory function to restore the surface microstructure, make the hydrogel into a planar structure, reduce the wet state adhesion of the hydrogel, and achieve Modulation of Adhesion of Hydrogels.

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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Patent Type & Authority Patents(China)
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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