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Preparation method for waterproof polyvinyl alcohol / soybean protein isolate PVA / SPI composite membrane

A technology of soybean protein isolate and polyvinyl alcohol, applied in the field of polymer materials, can solve problems such as toxicity or difficult reaction control, and achieve the effects of improving biocompatibility, degradability, and good water solubility

Inactive Publication Date: 2015-04-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used modifiers include aldehydes, boric acid, urea, organosilicon groups, etc., but these modifiers are either toxic or the reaction is difficult to control

Method used

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  • Preparation method for waterproof polyvinyl alcohol / soybean protein isolate PVA / SPI composite membrane
  • Preparation method for waterproof polyvinyl alcohol / soybean protein isolate PVA / SPI composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of SPI aqueous solution: Add 1 g of SPI powder into deionized water, and mechanically stir for 5 min at room temperature to disperse the powder evenly in the water. The mixture was heated and stirred at 80° C. for 30 min to obtain a 7.14 wt % SPI aqueous solution.

[0018] (2) Preparation of PVA aqueous solution: 5 g of PVA was dissolved in 92° C. water for 30 minutes to obtain 10 wt % PVA aqueous solution.

[0019] (3) Preparation of PVA / SPI mixed solution: Mix SPI aqueous solution and PVA aqueous solution at a ratio of 1:5 (w / w), and stir with a magnetic stirrer to make it evenly mixed. The solution was then cooled to room temperature and the initial pH of the solution was tested. Then add a certain amount of 2mol / L NaOH solution to the solution to change the pH of the solution to 11.5. The solution was mixed under mechanical stirring at 80° C. for 60 min.

[0020] (4) Preparation of PVA / SPI film: After the PVA / SPI mixed solution was defoamed at roo...

Embodiment 2

[0022] Differential scanning calorimetry (DSC) is used in DSC 822e under a nitrogen atmosphere with a heating rate of 15°C / min. The pure MFC film, pure PVA film and PVA / SPI composite film are tested respectively. The temperature rises from 25°C Keep at 250°C for 3 minutes, then drop from 250°C to 25°C, then rise from 25°C to 250°C, and end the test. About 8-10mg is used for each sample, and the second temperature rise curve of the composite film is obtained. (1) and cooling curve (2).

[0023] The DSC second heating curve of various membranes (1), we can see from the figure that the pure PVA membrane, the pure SPI membrane does not have a significant glass transition temperature (Tg), and the pure PVA membrane Tg is about 85 ℃, The Tg of PVA / SPI composite film is about 82°C, which is close to that of pure PVA film. In addition, the melting point of the pure PVA film is about 217°C. The melting point of the PVA / SPI composite film is about 215°C, which is slightly lower than th...

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Abstract

The invention belongs to the field of high polymer materials, and provides a preparation method for a waterproof polyvinyl alcohol / soybean protein isolate PVA / SPI composite membrane. According to the method, firstly, SPI solution is added into PVA solution, then the pH is adjusted to enable the PVA solution and the SPI solution to have well compatibility, carboxyl containing amino acid can play a role of sealing PVA molecular chain hydroxyl, and the PVA / SPI composite membrane is obtained. As protein, SPI can greatly improve biocompatibility and degradability of PVA, and therefore the composite membrane has superior water resistance, mechanical property and heat stability, and can be applied to the field of biodegradable packaging materials.

Description

technical field [0001] The invention relates to a method for preparing a water-resistant polyvinyl alcohol / soybean protein isolate (PVA / SPI) composite film, in particular to changing the ratio of PVA and SPI to adjust the pH to obtain a water-resistant composite material, which belongs to the field of polymer materials. Background technique [0002] Water-soluble polyvinyl alcohol (PVA), which is obtained by hydrolysis of polyvinyl acetate, has the structural formula -CH2CH(OH) n -It is a high molecular polymer with hydroxyl groups. The main chain of the PVA molecule is a carbon chain, and each repeating unit contains a hydroxyl group. Due to the small size and strong polarity of the hydroxyl group, it is easy to form hydrogen bonds. Its chemical properties are stable and have sufficient thermal stability, high hydrophilicity and water solubility. ; At the same time, it also has good film-forming properties and adhesion, excellent resistance to grease and solvents, and good...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08L89/00
Inventor 白绘宇李育飞周璇刘晓亚
Owner JIANGNAN UNIV
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