Method for inhibiting migration of plasticizer in esterified starch film and esterified starch film

A technology of esterified starch and plasticizer, which is applied in the field of inhibition of plasticizer in esterified starch-based biodegradable packaging materials, can solve problems such as ignoring the adjustment of the interaction of polymer materials, and achieve good use effect and wide application range Wide, operable effect

Active Publication Date: 2015-04-22
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these methods of inhibiting plasticizer migration all use physical or chemical means to modify the polymer material to inhibit the migration of plasticizer from the polymer material, ignoring the interaction between the polymer material itself and the plasticizer. adjustment

Method used

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  • Method for inhibiting migration of plasticizer in esterified starch film and esterified starch film
  • Method for inhibiting migration of plasticizer in esterified starch film and esterified starch film
  • Method for inhibiting migration of plasticizer in esterified starch film and esterified starch film

Examples

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Effect test

Embodiment 1

[0021] A method for suppressing plasticizer migration in esterified starch films, carried out through the following steps:

[0022] (1) Add starch milk with a water content of 40% into a high-temperature and high-pressure reactor, control the pH of the system to 9, then add 2ml / g of acetic anhydride (calculated on a dry basis of starch) and stir for 0.5h at a temperature of 80°C. After the reaction is completed, add water to precipitate, filter, and dry to obtain acetate-esterified starch with a substitution degree of 1.17.

[0023] (2) dissolving the acetate-esterified starch obtained in step (1) in acetone to form a solution with a mass percentage concentration of 4%, adding plasticizer diethyl phthalate 20% (w / w, in the form of ester Starch dry basis) using a fluidized bed at 50 ° C, with a spray rate of 1.0mL / min and an atomization pressure of 1.0 MPa, it is sprayed into a translucent film on a polytetrafluoroethylene plate to obtain an esterified starch film (such as figu...

Embodiment 2

[0025] A method for suppressing plasticizer migration in esterified starch films, carried out through the following steps:

[0026] (1) Add starch milk with a water content of 70% into a high-temperature and high-pressure reactor, control the pH of the system to 10.5, then add 3ml / g of propionic anhydride (based on starch dry basis) and stir for 0.5h at a temperature of 90°C. After the reaction is completed, add water to precipitate, filter, and dry to obtain acetate-esterified starch with a substitution degree of 1.43.

[0027] (2) dissolving the acetate-esterified starch obtained in step (1) in acetone to form a solution with a mass percentage concentration of 4%, adding plasticizer diethyl phthalate 20% (w / w, in the form of ester Starch dry basis) Utilize fluidized bed at 52 ℃, with spraying rate 2.0mL / min, atomization pressure is 0.5MPa to spray on polytetrafluoroethylene board into translucent film, promptly obtains esterified starch film (such as figure 2 shown).

Embodiment 3

[0029] A method for suppressing plasticizer migration in esterified starch films, carried out through the following steps:

[0030] (1) Add starch milk with a water content of 60% into a high-temperature and high-pressure reaction kettle, control the pH of the system to 10.5, then add 3ml / g of propionic anhydride (based on starch dry basis) and stir at a temperature of 90°C for 1.5h, After the reaction is completed, add water to precipitate, filter, and dry to obtain acetate-esterified starch with a substitution degree of 1.81.

[0031] (2) dissolving the acetate-esterified starch obtained in step (1) in acetone to form a solution with a mass percentage concentration of 4%, adding plasticizer diethyl phthalate 20% (w / w, in the form of ester Starch dry basis) Utilize fluidized bed at 50 ℃, with spray rate 1.0mL / min, atomization pressure is 1.2MPa to spray on polytetrafluoroethylene board into translucent film, promptly obtains esterified starch film (such as figure 2 shown). ...

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Abstract

The invention discloses a method for inhibiting migration of a plasticizer in an esterified starch film and an esterified starch film. The method comprises the following steps: (1) adding starch milk with a certain moisture content into a high-temperature high-pressure reaction kettle, controlling the pH of the system, adding acetic anhydride or propionic anhydride, stirring and reacting for 0.5-4.0 hours at a temperature of 80-100 DEG C, then, adding water to precipitate, filtering and drying to obtain esterified starch; (3) dissolving the esterified starch in acetone to prepare a 40% solution, adding a 20-30% plasticizer, spraying on a polytetrafluoroethylene plate though a fluidized bed at a temperature of 50-55 DEG C with a spraying rate of 1.0-2.8mL/min and atomizing pressure of 0.5-1.5MPa to form a semitransparent film, thereby obtaining the esterified starch film. The method disclosed by the invention can be used for reasonably controlling an aggregation state structure inside the esterified starch film, so that the good in effect in inhibiting the migration of the plasticizer is achieved, the operability is strong and the applied range is wide.

Description

technical field [0001] The invention belongs to a method for inhibiting migration of plasticizers in starch-based packaging materials, in particular to a method for inhibiting plasticizers in esterified starch-based biodegradable packaging materials. Background technique [0002] The development of starch-based biodegradable materials is an important way to alleviate the problems of ecological environment pollution and resource shortage in the world today. However, the presence of a large number of hydroxyl groups in natural starch molecules makes the prepared materials poor in moisture resistance, and their mechanical properties decrease significantly after contact with water. Applications of starch-based biodegradable materials in high-moisture environments. Most of the hydroxyl groups in the esterified starch with a high degree of substitution are replaced by hydrophobic ester groups. It is an excellent hydrophobic raw material. The prepared film has the advantages of hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08K5/12C08J5/18C08B31/04
Inventor 李琳李晓玺黄晨陈玲朱杰李冰
Owner SOUTH CHINA UNIV OF TECH
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