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PVA-based composite material and precursor thereof, remolded product, composite hydrogel, and composite film and preparation and application thereof

A composite hydrogel and composite material technology, which is applied in the field of PVA-based composite materials and their precursors, can solve problems such as toughness and other mechanical properties that cannot meet the requirements

Active Publication Date: 2019-10-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects that the PVA-TA hydrogel in the prior art still retains the crystal structure of the PVA hydrogel, so that the mechanical properties such as toughness cannot meet the requirements, and a PVA-based hydrogel is provided. Composite materials and their precursors, remodeling products, composite hydrogels, composite films and their preparation and application

Method used

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  • PVA-based composite material and precursor thereof, remolded product, composite hydrogel, and composite film and preparation and application thereof
  • PVA-based composite material and precursor thereof, remolded product, composite hydrogel, and composite film and preparation and application thereof
  • PVA-based composite material and precursor thereof, remolded product, composite hydrogel, and composite film and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] The preparation of embodiment 1 composite material

[0104] Preparation method of composite material:

[0105] 1. Add 15 grams of PVA powder into 285 grams of deionized water, heat (95°C oil bath) to dissolve, and obtain a PVA aqueous solution with a mass fraction of 5%;

[0106] 2. Mix the 10mg / mL TA aqueous solution and the PVA solution diluted to 10mg / mL at a mass ratio of TA:PVA of 0.25:1.0,0.50:1.0,0.75-1.0,1.0-1.0,1.0-0.75 and 1.0-0.50 , under stirring, adjust the pH value of the above mixed solution to 2.0 with 1mol / L hydrochloric acid to obtain a precipitate;

[0107] 3. Centrifuge the precipitate with a centrifuge to obtain the precursor, and press it through a press (or glass sheet) and dry it.

[0108] Concrete yield test result is as shown in table 1 below:

[0109] Table 1 Test results of different mass ratios

[0110]

[0111] The reaction yield refers to the percentage of the dried mass of the precipitate obtained in the reaction to the sum of the ...

Embodiment 2

[0117] The preparation of embodiment 2 composite hydrogels

[0118] The PVA with a thickness of 150 μm and the TA with a thickness of 150 μm prepared in Example 1 were respectively 0.50 -PVA 1.0 Composite film, TA with a thickness of 150 μm 1.0 -PVA 0.50 The composite membrane was bubbled in deionized water until the sample was saturated with water (referred to as a hydrogel).

Embodiment 3

[0119] The preparation of embodiment 3 composite film

[0120] Film preparation process: the three composite hydrogels of Example 2 were biaxially stretched and fixed, and dried for 20 minutes to obtain a film with a thickness of about 30 μm (thickness can be controlled by the degree of stretching).

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Abstract

The invention discloses a PVA-based composite material and a precursor thereof, a remolded product, a composite hydrogel, and a composite film and preparation and application thereof. A preparation method for the precursor of the PVA-based composite material comprises the following steps: precipitating a solution obtained by uniformly mixing an aqueous solution of polyvinyl alcohol and an aqueoussolution of tannic acid, and separating and collecting a precipitate, wherein amass ratio of tannic acid to polyvinyl alcohol is 0.016: 1 or above. The composite material, composite hydrogel and composite film provided by the invention have the advantages of enhanced strength, greatly improved toughness and the like, and also have water processing properties, ultraviolet light absorption performance, fresh-keeping performance, easy degradation performance and remodelability.

Description

technical field [0001] The invention relates to a PVA-based composite material and its precursor, a remodeling product, a composite hydrogel, a composite film and its preparation and application. Background technique [0002] Utilize TA (tannic acid) to improve the method of PVA (polyvinyl alcohol) toughness at present not much, because PVA mostly is crystalline polymer, so the PVA composite material after utilizing the TA modification of prior art report also basically all is Crystalline products. [0003] For example, Yu Guan et al. (Yu Guan, Bio-inspired natural polyphenol cross-linkingpoly (vinyl alcohol) films with strong integrated strength and toughness, RSCAdvances., 2016, 6, p69966) published a method for improving the toughness of PVA by using TA , which added the TA solution into the PVA solution dropwise, and evaporated the water at 40° C. to obtain the TA-PVA composite film. The mass of TA added in the composite film accounts for 1% to 10% of the mass of PVA. ...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08J3/075C08J5/18C08L87/00
CPCC08G83/008C08J3/075C08J5/18C08J2387/00C08L87/00C08L2203/16
Inventor 刘小孔牛文文
Owner JILIN UNIV
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