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Low-migration hydrophobic starch-based nano-composite film and preparation method thereof

A composite film and nano-composite technology, which is applied in the field of inhibiting plasticizer migration, can solve the serious problems of plasticizers, achieve the effect of small diffusion coefficient, lower diffusion coefficient, and slow down the migration of plasticizers

Inactive Publication Date: 2018-02-23
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the migration of plasticizers in existing starch-based composite films is still relatively serious.

Method used

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  • Low-migration hydrophobic starch-based nano-composite film and preparation method thereof
  • Low-migration hydrophobic starch-based nano-composite film and preparation method thereof
  • Low-migration hydrophobic starch-based nano-composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A low-migration hydrophobic starch-based nanocomposite film, the preparation method of the composite film is as follows:

[0035] (1) Stir and activate corn starch (moisture content 12.65%) with an amylose content of 0.67 ± 0.07 (%) in pyridine at 85°C and a speed of 200r / min for 2 hours, according to the ratio of 1:5 to starch (g / mL) with propionic anhydride, stirred and reacted at 95°C and 300r / min for 4h, washed with water, dried and pulverized to obtain hydrophobic esterified starch with a high degree of substitution, with a degree of substitution of 2.61 ± 0.03.

[0036] (2) Make the hydrophobic starch obtained in step (1) into a solution according to the ratio of 4% by mass of acetone, stir and disperse, add organically modified montmorillonite Dellite 72T with 2% by mass of hydrophobic starch (w / w), to 30% (w / w) of the mass of hydrophobic starch was added with plasticizer triacetin, stirred for 4 hours, poured into a polypropylene mold, and dried at 45°C to obta...

Embodiment 2

[0038] A low-migration hydrophobic starch-based nanocomposite film, the preparation method of the composite film is as follows:

[0039](1) Stir and activate corn starch (moisture content 11.60%) with an amylose content of 23.74 ± 0.08 (%) in pyridine at 85°C and a speed of 200r / min for 2 hours, according to the ratio of 1:5 to starch (g / mL) with propionic anhydride, stirred and reacted at 95°C and 300r / min for 4h, washed with water, dried and pulverized to obtain hydrophobic esterified starch with a high degree of substitution, with a degree of substitution of 2.36 ± 0.01.

[0040] (2) The hydrophobic starch obtained in step (1) was formulated into a solution according to the proportion of 4% by mass of acetone, stirred and dispersed, and organically modified montmorillonite Dellite 72T with 2% by mass of hydrophobic starch (w / w) was added to 30% (w / w) of the mass of hydrophobic starch was added with plasticizer triacetin, stirred for 4 hours, poured into a polypropylene mol...

Embodiment 3

[0042] A low-migration hydrophobic starch-based nanocomposite film, the preparation method of the composite film is as follows:

[0043] (1) Stir and activate corn starch (moisture content 10.90%) with an amylose content of 47.31 ± 0.05 (%) in pyridine at 85°C and a speed of 200r / min for 2 hours, according to the ratio of 1:5 to starch (g / mL) with propionic anhydride, stirred and reacted at 95°C and 300r / min for 4h, washed with water, dried and pulverized to obtain hydrophobic esterified starch with a high degree of substitution, with a degree of substitution of 2.40 ± 0.01.

[0044] (2) The hydrophobic starch obtained in step (1) was formulated into a solution according to the proportion of 4% by mass of acetone, stirred and dispersed, and organically modified montmorillonite Dellite 72T with 1% by mass of hydrophobic starch (w / w) was added to 30% (w / w) of the mass of hydrophobic starch was added with plasticizer triacetin, stirred for 4 hours, poured into a polypropylene mo...

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Abstract

The invention relates to a low-migration hydrophobic starch-based nano-composite film. A preparation method of the composite film includes the steps: S1 dispersing starch into an organic solvent, stirring and activating the starch and then adding anhydride to prepare hydrophobic esterified starch; S2 dispersing the hydrophobic esterified starch and organically modified montmorillonite Dellite 72Tinto the organic solvent to form turbid liquid, adding plasticizers, uniformly stirring the plasticizers and the turbid liquid, pouring mixture into a mould, and drying the mixture to obtain the hydrophobic starch-based nano-composite film. In the S1, the content of amylase in the starch is 0.5-82%, and the esterification degree of the hydrophobic esterified starch is larger than 2.3. In the S2, the weight ratio of the hydrophobic esterified starch to the organically modified montmorillonite Dellite 72T is 100:(1-6). By regulating interaction of the hydrophobic esterified starch, the organically modified montmorillonite and the plasticizers and regulating a formed aggregation structure, the whole migration initial release rate and the long-term migration diffusion coefficient of the plasticizers in the prepared composite film are remarkably reduced, and migration of the plasticizers is effectively slowed down.

Description

technical field [0001] The invention belongs to a method for inhibiting the migration of plasticizers in starch-based packaging materials, and in particular relates to a low-migration hydrophobic starch-based nanocomposite film and a preparation method thereof. Background technique [0002] Starch-based packaging materials have gradually replaced traditional petroleum-based plastic packaging in food, pharmaceutical and other industrial fields due to their advantages of environmental protection, low cost, and wide range of raw material sources. However, the large number of hydroxyl structures in starch molecules makes starch molecules have strong hydrophilicity and intermolecular hydrogen bonding, resulting in poor processing performance of starch. Esterified modified starch with a high degree of substitution can effectively improve the water resistance of starch-based materials (Fringant C., Rinaudo M., Foray M.F.M., et al, Preparation of mixed esters of starch or use of an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L3/06C08K9/04C08K5/103
CPCC08J5/18C08J2303/06C08K5/103C08K9/04
Inventor 朱杰李琳张书艳周燕雪李玉婷
Owner DONGGUAN UNIV OF TECH
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