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Polyvinyl alcohol/xylan biodegradable composite membrane and preparation method and application thereof

A polyvinyl alcohol, biodegradable technology, used in biological packaging, flexible covering, climate change adaptation and other directions, can solve the problems of leakage, insoluble in water, difficult to degrade film, etc., to reduce consumption and save resources , reduce the effect of hydrogen bonding

Inactive Publication Date: 2013-05-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves creating an improved type of composition called CAPLAN that combines calcium salt with polysaccharide chains like glycoproteins or glucans into one structure. By mixing this mixture together at room temperature without causing any harmful chemical reactions, such compositions have potential applications in various industries including medicine, cosmetic products, electronics, coatings, etc., making them more environmentally friendly compared to existing methods.

Problems solved by technology

This patents discuss how adding smaller amounts of different chemical substances can help make better quality flexible cellophanumeric displays that resist tearing during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 3.0g of polyvinyl alcohol with a molecular weight of 162801g / mol, dissolve it in hot water at 90°C for 2h, add 1.0g of polyvinyl alcohol with a molecular weight of 12, 3011g / mol and 1.0g of citric acid (prepared into a 10mL solution) , after stirring at 90°C for half an hour, put it in a water bath at 65°C, and stir thoroughly for 4h. Let it stand still, cast it on a clean polytetrafluoroethylene board placed horizontally, dry it in vacuum at 50°C, and peel off the film after 20 hours to obtain a polyvinyl alcohol / xylan biodegradable composite film. The thickness of this film is 88.3μm, the size is 15×15cm 2 . The prepared film was placed in a constant temperature and humidity chamber to be tested. Obtained by a tensile testing machine, the tensile strength is 11.58MPa, and the elongation at break is 249.50%. Prior art literature report (Limpan N.ProdpranT.Benjakul S.Prasarpran S.Influences of degree of hydrolysis and molecular weight of poly(vinyl alcohol) (PV...

Embodiment 2

[0027] Weigh 3.0g of polyvinyl alcohol with a molecular weight of 17,9687g / mol, put it in hot water at 100°C for 1h, add 1.0g of xylan with a molecular weight of 13,1463g / mol and 0.2g of citric acid (prepared into a 1mL solution) , after stirring at 100°C for half an hour, put it in a water bath at 80°C, and fully stir for 2h. Let it stand still, cast it on a clean polytetrafluoroethylene board placed horizontally, dry it in vacuum at 60°C, and peel off the film after 12 hours to obtain a polyvinyl alcohol / xylan biodegradable composite film. The thickness of the film is 60.2μm and the size is 15×15cm 2 . The prepared film was placed in a constant temperature and humidity chamber to be tested.

[0028] Obtained by a tensile testing machine, the tensile strength is 37.42MPa, and the elongation at break is 13.67%. It has been reported in the literature that the tensile strength of the composite film prepared by blending polyvinyl alcohol and fish muscle fiber protein is 10.65 ...

Embodiment 3

[0030] Weigh 3.2g of polyvinyl alcohol with a molecular weight of 14,0203g / mol, dissolve it in hot water at 80°C for 4h, add 0.8g of xylan with a molecular weight of 10,1024g / mol and 2.0g of citric acid (prepared into a 5mL solution ), stirred at 80°C for half an hour, put it in a water bath at 50°C, and stirred thoroughly for 6h. Let it stand still, cast it on a clean polytetrafluoroethylene board placed horizontally, dry it in vacuum at 30°C, and peel off the film after 24 hours to obtain a polyvinyl alcohol / xylan biodegradable composite film. The thickness of this film is 110.5μm, and the size is 15×15cm 2 . The prepared film was placed in a constant temperature and humidity chamber to be tested.

[0031] Obtained by a tensile testing machine, the tensile strength is 15.16MPa, and the elongation at break is 136.73%. It has been reported in the literature that the tensile strength of the composite film prepared by blending polyvinyl alcohol and fish muscle fiber protein i...

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Abstract

The invention discloses a polyvinyl alcohol/xylan biodegradable composite membrane and a preparation method and an application thereof. The preparation method comprises the following steps: adding polyvinyl alcohol into water, dissolving for 1-4 hours at a temperature of 80-100 DEG C, adding and uniformly mixing xylan and citric acid and controlling the mass ratio of the xylan to the citric acid to be 1:1-4:1; and agitating obtained mixed solution for 2-6 hours at a temperature of 50-80 DEG C, standing, casting on a horizontally-arranged clean polyfluortetraethylene plate and vacuum-drying to obtain the polyvinyl alcohol/xylan biodegradable composite membrane. The polyvinyl alcohol/xylan biodegradable composite membrane and the preparation method and the application thereof have the benefits that the composite membrane has a tensile strength of 7.58-37.42 MPa and an elongation at break of 13.67-249.50 percent; the process is simple, the reaction conditions are easy to control, no environmental pollution is generated in the production process, and the industrialization is easy; and the composite membrane is innocuous, has good biodegradability and higher strength and can be applied to food packaging materials.

Description

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Claims

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Application Information

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Owner SOUTH CHINA UNIV OF TECH
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