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Preparation method of anti-dry and anti-freezing hydrogel

A technology of gel and frozen water, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators. It can solve the problems of limited use and achieve uniform distribution, short experiment period, Simple operation effect

Active Publication Date: 2020-08-18
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby solving the problem that hydrogel-based detection devices inhibit ion transmission due to freezing below zero or dehydration and drying in dry environments, thus limiting their use in low temperature and dry environments

Method used

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  • Preparation method of anti-dry and anti-freezing hydrogel
  • Preparation method of anti-dry and anti-freezing hydrogel
  • Preparation method of anti-dry and anti-freezing hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Dissolving acrylamide monomer in solvent water to prepare acrylamide monomer solution with a mass fraction of 1%;

[0028] b. Dissolving the cross-linking agent N,N'-methylenebisacrylamide in water to form a N,N'-methylenebisacrylamide crosslinking agent solution with a mass fraction of 1g / L;

[0029] c. Under magnetic stirring, drop 784 μl of the N,N'-methylenebisacrylamide crosslinking agent solution obtained in step b into 20 ml of the acrylamide monomer solution obtained in step a, keep stirring for 10 minutes, and add acrylamide 0.1% initiator tetramethylethylenediammonium based on monomer mass fraction and 0.1% additive clay based on acrylamide monomer mass fraction, continue stirring for 20 minutes, then add acrylamide monomer mass fraction 1% of moisturizing molecular sulfuric acid;

[0030] d. According to the addition of tetramethylethylenediammonium initiator, select the ultraviolet light with a wavelength of 365nm for 30 minutes to carry out photopolymer...

Embodiment 2

[0033] a. Dissolving the N-(isobutoxy)methacrylamide monomer in a solvent to form a 50% N-(isobutoxy)methacrylamide monomer solution by mass fraction;

[0034] b. Dissolving the N,N'-diisopropylcarbodiimide crosslinking agent in water to form a N,N'-diisopropylcarbodiimide crosslinking agent solution with a mass fraction of 20g / L;

[0035] c. Under magnetic stirring, drop 784 μl of the N,N'-diisopropylcarbodiimide crosslinking agent solution obtained in step b into the N-(isobutoxy)methacrylamide monomer obtained in step a In 20ml of the solution, keep stirring for 10min, add 1% ammonium persulfate initiator based on the mass fraction of N-(isobutoxy)methacrylamide monomer and N-(isobutoxy)methacrylamide 10% polyethylene glycol (PEG) additive based on the mass fraction of the amide monomer, after continuing to stir for 20 minutes, add 40% of the moisturizing agent based on the mass fraction of N-(isobutoxy) methacrylamide monomer sex molecule phosphoric acid;

[0036] d. Acc...

Embodiment 3

[0039] a. Dissolving the methacrylamide monomer in a solvent to prepare a methacrylamide monomer solution with a mass fraction of 10%;

[0040] b. Dissolving the N,N'-methylenebisacrylamide crosslinking agent in water to form a N,N'-methylenebisacrylamide crosslinking agent solution with a mass fraction of 12g / L;

[0041] c. Under magnetic stirring, drop 784 μl of the N,N'-methylenebisacrylamide crosslinking agent solution obtained in step b into 20 ml of the methacrylamide monomer solution obtained in step a, keep stirring for 10 minutes, and add 1% sodium bisulfite initiator based on the mass fraction of methacrylamide monomer and 8% polyvinyl alcohol (PVA) additive based on the mass fraction of methacrylamide monomer, after continuing to stir for 20min, add 20% moisturizing molecular acrylic acid based on the mass fraction of methacrylamide monomer;

[0042] d. According to the addition of sodium bisulfite initiator, select a UV light with a wavelength of 254nm to illuminate...

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Abstract

The invention relates to a preparation method of an anti-dry and anti-freezing hydrogel. The hydrogel is prepared from a monomer, a solvent, a crosslinking agent, an initiator, an additive and hygroscopic molecules, the anti-dry performance of the anti-dry and anti-freezing hydrogel prepared by the preparation method is that the elasticity is still kept after the hydrogel is placed in a dry environment with a humidity of 11%-13% RH for 1-7 months in an open mode at the room temperature, the anti-freezing performance is that the hydrogel is still not frozen after being dried in a vacuum dryingbox at the temperature of -50 DEG C for 1-7 days, and good elasticity is kept. The anti-dry anti-freezing hydrogel is adopted to load an explosive detection reagent and is directly used for detectingcorresponding explosive particles or liquid. Therefore, the problem that a detection device taking hydrogel as a substrate inhibits ion transmission due to freezing below zero DEG C or loss of water when used in a dry environment and further limits the use of the detection device in a low-temperature and dry environment is solved.

Description

technical field [0001] The invention belongs to the field of material preparation and specifically provides a method for preparing an anti-drying and anti-freeze hydrogel. Background technique [0002] Hydrogel-based detection substrates, because of the water-rich properties of hydrogels, have been widely used in drug delivery, sensor construction, tissue engineering, soft electronics and other fields. However, due to the large amount of dissolved water, conventional hydrogels inevitably freeze at sub-zero temperatures and dry out when used in dry environments, thereby limiting the transport of ions, which fundamentally limits their use as detection substrates at low temperatures and Use in dry environments. The current research on the antifreeze and anti-drying properties of hydrogels is mainly to add antifreeze agents, such as glycerin and ethylene glycol, etc. (Angewandte Chemie International Edition2018, 57, 6568-6571). Chinese patent (CN 108329497A) describes an antif...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08F220/58C08F220/54C08F220/06C08F120/58C08F120/56C08F2/50C08F2/44C08K3/30C08K3/32C08K5/09C08K5/053G01N21/78
CPCC08F220/56C08F220/54C08F120/58C08F120/56C08F222/385C08F220/58C08F2/50C08F2/44C08K3/30C08K3/32C08K5/09C08K5/053G01N21/78C08K2003/309C08K2003/329C08F220/06
Inventor 窦新存王培贤王广发蔡珍珍
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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