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Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof

A polyvinyl alcohol-based, polyvinyl alcohol technology, applied in the field of polymer composite materials, can solve the problems of poor water resistance and poor water resistance, and achieve the effects of excellent mechanical properties, low cost, and easy industrialization.

Active Publication Date: 2012-06-13
DUNHUANG XIYU MINING & CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinyl alcohol contains a large number of hydroxyl groups, and the water resistance is poor. Filling PGS in the PVA matrix has a significant improvement in mechanical properties, but due to the existence of a large number of hydrophilic group hydroxyl groups, the water resistance is not very good.

Method used

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  • Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof
  • Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof
  • Water-resistant polyvinyl alcohol (PVA)-based composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Stir a certain mass of PVA particles with distilled water at 95°C for 3 hours to fully dissolve it, and configure it into a 2 wt% PVA solution; accurately weigh 20% of the mass of PVA sodium carboxymethyl cellulose, and use distilled water to prepare a uniform solution of 1 wt%. CMC solution; Weigh plant straw powder with 1% PVA mass and PGS with 0.6% PVA mass and ultrasonically disperse in water to form a suspension (ST-PGS) with a total mass concentration of 30%; Mix the PVA solution and CMC solution thoroughly Finally, add the ST-PGS suspension and stir to form a mixed film liquid (the total mass concentration of polyvinyl alcohol, sodium carboxymethyl cellulose, ST and PGS in the mixed liquid film is 2.5%). After mixing evenly, add 10 wt % glycerin as a plasticizer, stirred at 80°C for 15 min, cooled to 30°C, added oxalic acid with 2.5% of PVA mass as a crosslinking agent, adjusted the pH of the mixture to 3, and crosslinked and blended for 10 minutes, Invert the mo...

Embodiment 2

[0043] Stir a certain mass of PVA particles with distilled water at 95°C for 3 hours to fully dissolve it, and prepare a 5 wt% PVA solution; accurately weigh 50% of the mass of PVA sodium carboxymethyl cellulose, and use distilled water to prepare a 2.5 wt% solution Uniform CMC solution; Weigh plant straw powder with 5% PVA mass and PGS with 6% PVA mass and ultrasonically disperse in water to form a suspension with a mass concentration of 50% (ST-PGS); fully mix the PVA solution and the CMC solution Finally, add the ST-PGS suspension and stir to form a mixed film liquid (the total mass concentration of polyvinyl alcohol, sodium carboxymethyl cellulose, ST, and PGS in the mixed liquid film is 5%). After mixing evenly, add 50 wt % methanol as a plasticizer, stirred at 90°C for 30 min, cooled to 60°C, added 10% acetic acid of PVA mass as a crosslinking agent, adjusted the pH of the mixture to 7, and crosslinked and blended for 30 minutes. Invert the mold. Placed in an oven, drie...

Embodiment 3

[0046] Stir a certain mass of PVA particles with distilled water at 95°C for 3 hours to fully dissolve, and prepare a 3 wt% PVA solution; accurately weigh 30% of the mass of PVA sodium carboxymethyl cellulose, and use distilled water to prepare a 2 wt% solution Uniform CMC solution; Weigh plant straw powder with 2% PVA mass and PGS with 1% PVA mass and ultrasonically disperse in water to form a suspension with a mass concentration of 40% (ST-PGS); fully mix the PVA solution and the CMC solution Finally, add the ST-PGS suspension and stir to form a mixed film liquid (the total mass concentration of polyvinyl alcohol, sodium carboxymethyl cellulose, ST and PGS in the mixed liquid film is 3%). After mixing evenly, add 20 wt % ethanol as a plasticizer, stirred at 80°C for 20 min, cooled to 40°C, added citric acid with 4.5% PVA mass as a cross-linking agent, adjusted the pH of the mixture to 4, and cross-linked and blended for 20 min , Invert the mold. Placed in an oven, dried at ...

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Abstract

The invention provides a water-resistant polyvinyl alcohol (PVA)-based composite film and a preparation method thereof. The water-resistant polyvinyl alcohol-based composite film is a (PVA)-based blended composite film prepared by taking PVA as a substrate and taking carboxymethylcellulose sodium (CMC), paligorskite (PGS) clay and plant straw (ST) as fillers with a tape casting method. As proved by an experiment, the PVA-based composite film has excellent mechanical properties (tensile strength can be up to 10.22-15.87 MPa, and elongation at break is 189.09-436.60 percent) and excellent waterresistance (the water absorbing capacity is less than or equal to 10.5 percent, and moisture permeability is less than or equal to 0.59 g.mm / m<2>.h.KPa), and the application prospect of the PVA-basedcomposite film is expanded; the PGS clay and a large amount of rural waste plant straw are taken as fillers, so that the cost of the PVA-based composite film is reduced greatly; and the PVA-based composite film is prepared with the tape casting method, so that a process is simple, operation is convenient, cost is low, and industrialization is convenient.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and relates to a preparation method of a polyvinyl alcohol-based composite film, in particular to a preparation method of a water-resistant polyvinyl alcohol-based composite film. Background technique [0002] At present, the research on new organic-inorganic hybrid polymer composite materials with polymer as matrix and inorganic nanoparticles as filler is very active. Compared with traditional composite materials, organic-inorganic hybrid materials realize the chemical bonding between organic and inorganic materials, so the mechanical properties and heat resistance of the obtained composite materials are superior to conventional polymer composite materials with the same components. For example, in PVA / PGS nanocomposite materials (Zhiqin Peng et al., Aligrunent Effect of PGStapulgite on the Mechanical Properties of Poly(vinyl alcohol) / Attapulgite Nanocomposite Fibers, Journa...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L1/28C08L97/02C08K13/02C08K3/34C08J5/18
Inventor 张哲武战翠杨翠玲李芳红高淑玲崇雅丽佘厚德雷自强
Owner DUNHUANG XIYU MINING & CHEM
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