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A starch-protein based composite membrane material

A composite film and protein-based technology, applied in the field of packaging products, can solve problems such as not reaching the ideal state

Active Publication Date: 2022-07-19
HUNAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have effectively improved the performance of starch-based films, but they are far from ideal. As a biomass film, its strength, tear resistance, transparency and barrier properties still have a certain gap with plastic films.

Method used

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  • A starch-protein based composite membrane material

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Experimental program
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Effect test

preparation example Construction

[0074] The preparation process of the enzyme-treated starch is as follows: put corn starch into water to prepare a starch emulsion with a mass concentration of 5 g / 100 mL, seal it, heat it in a boiling water bath for 30 min to fully gelatinize the starch, cool it to 40 °C, and adjust the pH of the starch paste. The value was adjusted to 4.5, debranching enzyme was added, and after mixing uniformly, debranching was carried out in a water bath shaker at 60 °C for 8 min at a speed of 150 rmp, and then β-amylase was added to the gelatinization solution, mixed uniformly, and then allowed to stand at 45 °C. After the treatment, the enzyme was inactivated in a boiling water bath for 30 minutes, cooled to room temperature and placed for 25 minutes. After centrifugation, the precipitate was taken, dried at 50 °C for 12 hours, pulverized and sieved to obtain particles smaller than 400 mesh; the starch quality was used as the standard, among which The addition amount of debranching enzyme...

specific Embodiment 2

[0086] A starch-protein-based composite film material is composed of three layers of co-extrusion casting and compounding, including a starch film I on the surface layer, a starch film II on the bottom layer and a modified protein layer in the middle. In the composite film, the modified protein layer is The mass fraction of starch film I is 18%, the mass fraction of starch film I is 56%, and the mass fraction of starch film II is 26%;

[0087] The formulations and proportions of each layer are as follows:

[0088] The formula and material ratio of starch film I are:

[0089] 55 servings of enzyme-treated starch

[0090] 28 servings of enzyme-treated vegetable fibers

[0091] 8 parts dialdehyde starch

[0092] Amino-terminated four-arm polyethylene glycol 2 parts

[0093] 18 parts glycerin

[0094] Polyε-caprolactone 25 parts

[0095] The formula for the modified protein layer is:

[0096] 18 parts of polylactic acid-glycolic acid copolymer

[0097] Soy Protein Isolate ...

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Abstract

The invention relates to a starch-protein-based composite film material. The composite film is formed by co-extrusion casting of three layers, comprising a starch film I on the surface layer, a starch film II on the bottom layer and a modified protein layer in the middle. The composite film , the mass fraction of the modified protein layer is between 10-20%, the mass fraction of starch film I is between 40%-60%, and the mass fraction of starch film II is between 20%-50%, The composite film has excellent tensile and tear resistance, high transparency, and can be fully degraded. The film can be used in the fields of packaging films and packaging bags.

Description

technical field [0001] The invention belongs to the field of packaging products, in particular to a fully degradable film material with high strength and high barrier properties, which is prepared by using starch as the main raw material and multi-layer extrusion casting. Background technique [0002] At present, most of the packaging products are mainly made of plastic materials, such as PE, PP, PS, etc. The plastics have good mechanical properties, water and gas barrier properties, and a wide range of applications, with obvious advantages. However, because the plastic material itself is not degradable, it has an impact on the environment. my country attaches great importance to the environmental problems caused by plastics. In January and July 2020, strict plastic bans were issued successively to prohibit the use of plastic packaging products, which put forward high requirements for degradable material substitutes for plastics. A variety of biomass degradable base materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00B32B9/04B32B37/06B32B37/10C08L3/02C08L97/02C08L3/04C08L71/02C08L67/04C08L89/00C08K5/053C08K5/103C08K3/34C08K5/098C08J5/18
CPCB32B9/00B32B9/04B32B37/06B32B37/10C08J5/18C08J2303/02C08J2389/00C08J2303/04C08J2497/02C08J2403/04C08J2471/02C08J2467/04C08K5/053C08K5/103C08K3/346C08K5/098C08K2201/011
Inventor 陈一曾广胜刘文勇
Owner HUNAN UNIV OF TECH