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Toughened polyvinyl alcohol composite hydrogel and application thereof

A composite hydrogel and polyvinyl alcohol technology, applied in the toughened polyvinyl alcohol composite hydrogel, covering the field of protective hazardous chemicals, can solve the problem of delaying the volatilization and diffusion of hazardous chemicals, so as to delay the volatilization and diffusion, reduce the damage effect

Inactive Publication Date: 2016-08-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the application of polyvinyl alcohol composite hydrogel for on-site coverage of hazardous chemicals to quickly block or delay the volatilization and diffusion of hazardous chemicals has not been reported in the literature

Method used

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  • Toughened polyvinyl alcohol composite hydrogel and application thereof
  • Toughened polyvinyl alcohol composite hydrogel and application thereof
  • Toughened polyvinyl alcohol composite hydrogel and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 12.90 g of polyvinyl alcohol and 2.50 g of sodium alginate were dissolved in 100 mL of aqueous solution to obtain component A with a polyvinyl alcohol concentration of 129.0 mg / mL and a sodium alginate concentration of 25.0 mg / mL;

[0023] 2.58 g of borax was dissolved in 100 mL of aqueous solution to obtain component B with a borax concentration of 25.8 mg / mL.

[0024] Under electromagnetic stirring, component B (1 mL) was quickly added to component A (1 mL), and a hydrogel was formed after about 100 seconds.

[0025] figure 1 It is a scanning electron microscope picture of the above-mentioned hydrogel, which is a semi-interpenetrating three-dimensional network structure, sodium alginate uniformly runs through the entire network structure, and the pore size is about 20 μm.

Embodiment 2

[0027] 35.50 g of polyvinyl alcohol and 1.50 g of sodium alginate were dissolved in 100 mL of aqueous solution to obtain component A with a concentration of polyvinyl alcohol of 355.0 mg / mL and a concentration of sodium alginate of 15.0 mg / mL;

[0028] 1.42 g of borax was dissolved in 100 mL of aqueous solution to obtain component B with a borax concentration of 14.2 mg / mL.

[0029] Under electromagnetic stirring, component B (1 mL) was quickly added to component A (1 mL), and a hydrogel was formed after about 59 seconds.

[0030] figure 2 It is the tensile property graph of the above-mentioned hydrogel, and the maximum tensile strength is 69.25kPa. The addition of sodium alginate makes the hydrogel form a semi-interpenetrating network structure, and the force between the molecular chains is enhanced, so that the tensile strength of the gel increases during the deformation process and is not easy to break.

Embodiment 3

[0032] 20.20 g of polyvinyl alcohol and 0.40 g of sodium alginate were dissolved in 100 mL of aqueous solution to obtain component A with a polyvinyl alcohol concentration of 202.0 mg / mL and a sodium alginate concentration of 4.0 mg / mL;

[0033] 5.60 g of borax was dissolved in 100 mL of aqueous solution to obtain component B with a borax concentration of 56.0 mg / mL.

[0034] The gelation time was determined to be 99 seconds.

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Abstract

The invention provides toughened polyvinyl alcohol composite hydrogel and an application thereof. The dual-component composite hydrogel is prepared from polyvinyl alcohol, a toughening linear macromolecular chain and a boron compound. During application, the two components in the same volume are put in two liquid storage containers of a dual-component liquid spray gun respectively and are sprayed by the spray gun to cover surfaces of dangerous chemicals, the two components react rapidly, the hydrogel is generated, and volatilization and diffusion of the dangerous chemicals are stopped. The toughened polyvinyl alcohol composite hydrogel has the characteristics that the gelation speed is high, the tensile property is high, the hydrogel is not prone to fracture and the like.

Description

[0001] Field: [0002] The invention relates to a preparation method and application of a polyvinyl alcohol composite hydrogel, in particular to a toughened polyvinyl alcohol composite hydrogel and the technology of using it to cover and protect dangerous chemicals. Background technique: [0003] For hazardous chemicals spilled or leaked in public places, laboratories and other places, before professional treatment, the use of rapid prototyping covering materials to block the volatilization and diffusion of hazardous chemicals can effectively reduce environmental pollution and human harm . Rapid gelling hydrogel, as a material that can be rapidly solidified by liquid at the application site, is a polymer covering material with good film-forming properties. [0004] There have been many studies at home and abroad on the rapid gelation of hydrogels. For example, Wu accelerated the gelation process of silk fibroin by using an anionic surfactant, sodium lauryl sulfate [Wu, X. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L5/04C08L71/08C08K3/38
CPCC08J3/075C08J3/246C08J2329/04C08J2405/04C08J2471/08C08L29/04C08L2312/00C08L5/04C08K2003/387C08L71/00
Inventor 王志华原乐
Owner BEIJING UNIV OF CHEM TECH
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