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Corn starch composite membrane as well as preparation method and applications thereof

A corn starch, waxy corn starch technology, applied in climate change adaptation, sustainable manufacturing/processing, flexible covering, etc. The effect of good social and economic benefits

Active Publication Date: 2014-12-10
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This undoubtedly greatly limits the application of nano-zinc oxide in the fields of biology and medicine, such as ultraviolet light shielding materials, antibacterial agents, etc.

Method used

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  • Corn starch composite membrane as well as preparation method and applications thereof
  • Corn starch composite membrane as well as preparation method and applications thereof
  • Corn starch composite membrane as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Weigh 7.5g of cornstarch and 3g of glycerol, add them into a beaker filled with 100mL of distilled water, and mix different contents of nano-CaCO 3 Add 50mL of distilled water for ultrasonic dispersion, then mix with the mixture of starch and glycerol, heat in a boiling water bath until the starch is completely gelatinized, stir magnetically for 30 minutes, degas for about 15 minutes, pipette a certain amount of film liquid to make a film, and heat at 45°C Dry for 48 hours in a blower drier, remove the film, and store in a desiccator with a relative humidity (67%).

[0066] Configure Nano CaCO 3 The mass fractions of content in each film are 0%, 0.02%, 0.04%, 0.06%, 0.1%, 0.5% (nano CaCO 3 quality / quality of cornstarch).

[0067] Table 1 Nano-CaCO 3 Effect of Content on Mechanical Properties of Corn Starch Films

[0068]

[0069]

[0070] Note: The values ​​in the table are expressed as mean ± standard deviation; 2) Different letters after the mean value in ea...

Embodiment 2

[0093] Weigh 7.5g of cornstarch and 3g of glycerin, add them into a beaker filled with 100mL of distilled water, add different amounts of waxy cornstarch nanoparticles into 50mL of distilled water for ultrasonic dispersion, then mix them with the mixture of starch and glycerol, and place in a boiling water bath Heat in medium until the starch is completely gelatinized, stir magnetically for 30 minutes, degas for about 15 minutes, pipette a certain amount of film liquid to form a film, dry it in a blast dryer at 45°C for 48 hours, peel off the film, and store it at a relative humidity (67%) Store in a desiccator.

[0094] The mass fractions of starch nanoparticle content in each film were configured to be 0%, 1%, 5%, 15%, 20%, 25% (mass of starch nanoparticle / mass of cornstarch).

[0095] Table 4 Effect of waxy corn starch nanoparticles content on mechanical properties of corn starch films

[0096]

[0097] Note: The values ​​in the table are expressed as mean ± standard de...

Embodiment 3

[0116] Weigh 0.06% (accounting for starch dry basis) nano-CaCO 3 , add 100mL of distilled water for ultrasonic dispersion, add 7.5g of cornstarch and 3g of glycerin, heat in a boiling water bath until the starch is completely gelatinized, and after magnetic stirring for 30min, add different amounts of chitosan acetic acid solution into the cooled In the gelatinized liquid, stir magnetically for 30 minutes after mixing, then degas for about 15 minutes, pipette a certain amount of film liquid to form a film, dry it in a blast dryer at 45°C for 48 hours, peel off the film, and dry at a relative humidity (67%) save in the device.

[0117] Dissolve chitosan with different contents in 50ml concentration of 1% acetic acid solution, mix well, set aside.

[0118] The mass fractions of chitosan content in each film were configured to be 0%, 10%, 20%, 30%, 40%, 50% (mass of chitosan / mass of cornstarch).

[0119] (Escherichia coli ATCC 25922 Shanghai Fuxiang Biotechnology Co., Ltd.)

...

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Abstract

The invention discloses a corn starch composite membrane as well as a preparation method and applications thereof. The corn starch composite membrane comprises corn starch, glycerol and an enhancer, wherein the enhancer is nano CaCO3, waxy corn starch nanoparticles or chitosan, the mass ratio of the corn starch to glycerol is equal to (6.5-8.0):(1.5-3.0), when the enhancer is nano CaCO3 and waxy corn starch nanoparticles, the masses of the enhancer / corn starch are respectively 0.02-0.5, and 1-25; when the enhancer is nano CaCO3 or chitosan, the mass ratio of nano CaCO3 and corn starch is 0.06, and the mass ratio of chitosan and corn starch is 10-50; the size of the nano CaCO3 ranges from 30nm to 50nm; and the size of the waxy corn starch nanoparticles is 70-120nm. The mechanical performance of the composite membrane is obviously improved; the light transmittance and moisture penetrability of the membrane can be reduced; the thermal characteristic is better; the thermal stability of the composite membrane is higher than that of the corn starch membrane; and the corn starch and the nano CaCO3 particles have better compatibility.

Description

technical field [0001] The invention relates to a cornstarch composite film and its preparation method and application. Background technique [0002] With the depletion of petroleum resources and the increasing severity of "white pollution", the research and application of degradable packaging films made of renewable resources such as natural polymers have gradually become the focus of scientific research. Starch has the advantages of being environmentally friendly and degradable, and has broad application prospects. The single starch film currently studied has poor mechanical properties and poor moisture resistance, which is greatly limited in the application field. [0003] Nanoparticles have high surface energy and reactivity, and are prone to aggregation, weakening or even losing their original special properties. This undoubtedly greatly limits the application of nano zinc oxide in the fields of biology and medicine, such as ultraviolet light shielding materials and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L5/08C08K3/26C08K5/053C08J5/18B65D65/46
CPCY02A40/90Y02W90/10
Inventor 孙庆杰熊柳席婷婷姬娜李晓静姜岁岁
Owner QINGDAO AGRI UNIV
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