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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  • Abstract
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  • Application Information

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Problems solved by technology

Currently commonly used modifiers include aldehydes, boric acid, urea, organosilicon gr

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

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Example Embodiment

[0016] Example 1

[0017] (1) Preparation of SPI aqueous solution: 1g of SPI powder was added to deionized water, and mechanically stirred at room temperature for 5 minutes to make the powder uniformly dispersed in the water. The mixed solution 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: Dissolve 5 g of PVA in 92° C. water for 30 minutes to obtain a 10 wt% PVA aqueous solution.

[0019] (3) Preparation of PVA / SPI mixed solution: Mix the SPI aqueous solution and the PVA aqueous solution at 1:5 (w / w), and stir with a magnetic stirrer to make the mixture uniform. Then the solution was cooled to room temperature, and the initial pH value of the solution was tested. Then add a certain amount of 2mol / L NaOH solution to the solution, by changing the pH of the solution=11.5. The solution was mixed with mechanical stirring at 80°C for 60 minutes.

[0020] (4) Preparation of PVA / SPI film: After the PVA...

Example Embodiment

[0021] Example 2

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

[0023] The second DSC heating curve diagram of various types of films (1), from the figure we can see that pure PVA film, pure SPI film does not have a significant glass transition temperature (Tg), and pure PVA film Tg is about 85℃, The Tg of the PVA / SPI composite film is about 82°C, which is closer to the 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 the pure PVA film, but ther...

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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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