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Thermoplastic starch capable of being subjected to repeated hot-processing and preparation method of thermoplastic starch

A technology of thermoplastic starch and repeated thermal processing, applied in the field of starch deep processing, can solve the problems of starch no longer having thermoplastic properties, poor thermal stability of thermoplastic starch, reduced molecular weight of starch, etc., and achieve good repeated thermal processability and good repeatable thermal processability. Effect

Active Publication Date: 2015-06-03
西安康伟岳利软件科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, small molecule plasticizers significantly reduce the hydrogen bond of starch, and the plasticizing effect is excellent; The plasticizer is very easy to precipitate, volatilize, and lose, so the starch no longer has thermoplasticity after repeated thermal processing, which is also the main reason for the poor thermal stability of thermoplastic starch.

Method used

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  • Thermoplastic starch capable of being subjected to repeated hot-processing and preparation method of thermoplastic starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 40 parts by weight of tapioca starch, 40 parts by weight of pea starch and 2 parts by weight of hydroxylamine sulfate are refined by a ball mill until the particle size of the powder is ≤ 5 microns to obtain aminated starch;

[0038] (2) The C 18 The dimer acid of hydrogenated fatty acid is added to the high-speed mixer, the temperature of the high-speed mixer is raised to 100°C, the stirring speed is controlled at 200-300rpm, and glacial acetic acid is added while stirring, and the pre-condensation is carried out in the high-speed mixer for 30 minutes. The amount of glacial acetic acid added is controlled 2% of the mass of hydrogenated aliphatic dimer acid;

[0039] (3) Add the precondensed polymer obtained in step (2) into a two-stage twin-screw reaction extruder, set the temperature of the first-stage screw reactor to 80-120°C, and mix through the gap between the screw flight and the barrel to make the amination The crystals of starch relax to form amorphous ge...

Embodiment 2

[0042] (1) Thining 40 parts by weight of sweet potato starch, 45 parts by weight of acorn starch and 3 parts by weight of hexamethylenediamine through a vortex airflow refiner to obtain aminated starch;

[0043] (2) The C 18 The dimer acid of hydrogenated fatty acid is added to the high-speed mixer, the temperature of the high-speed mixer is raised to 100°C, the stirring speed is controlled at 250rpm, and glacial acetic acid is added while stirring, and the pre-condensation is carried out in the high-speed mixer for 45min. 3% of the mass of aliphatic dimer acid;

[0044] (3) Add the precondensed polymer obtained in step (2) into a two-stage twin-screw reaction extruder, set the temperature of the first-stage screw reactor to 80-120°C, and mix through the gap between the screw flight and the barrel to make the amination The crystals of starch relax to form amorphous gel powder, which is polycondensed with hydrogenated aliphatic dimer acid; through the second-stage screw react...

Embodiment 3

[0047] (1) Grinding 80 parts by weight of sago starch and 3 parts by weight of decanediamine through a grinder until the particle size of the powder is ≤5 microns to obtain aminated starch;

[0048] (2) C obtained by derivatizing the aminated starch obtained in step (1) with 10 parts by weight of dimer linolenic acid and dimer oleic acid 18 Add the dimer acid of hydrogenated fatty acid into the high-speed mixer, the temperature of the high-speed mixer is raised to 110°C, the stirring speed is controlled at 300rpm, and glacial acetic acid is added while stirring, and the pre-condensation is carried out in the high-speed mixer for 35min. The amount of glacial acetic acid added is controlled at 2% of hydrogenated aliphatic dimer acid quality;

[0049] (3) Add the precondensed polymer obtained in step (2) into a two-stage twin-screw reaction extruder, set the temperature of the first-stage screw reactor to 80-120°C, and mix through the gap between the screw flight and the barrel ...

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Abstract

The invention provides thermoplastic starch capable of being subjected to repeated hot-processing. The thermoplastic starch comprises the following components in parts by weight: 80-85 parts of starch, 10-15 parts of hydrogenated aliphatic dimer acid, 2-3 parts of an aminating agent and 0.5-1.5 parts of a tackifying processing aid. The starch is aminated and then is subjected to condensation polymerization with hydrogenated aliphatic dimer acid, and the defect that a small molecule plasticizer is easily separated out, volatilized and lost is overcome when the small molecule plasticizer is directly used for plastifying the starch, so that the thermoplastic starch has the high-temperature repeated hot-processing property. Furthermore, the invention also provides a preparation method of the thermoplastic starch. A double-order double-screw reaction extruder is adopted, so that the starch is sequentially subjected to continuous amorphization, condensed heat plasticization and deep condensation, and finally the starch is changed into the thermoplastic starch with the high-temperature repeated hot-processing property.

Description

technical field [0001] The invention relates to the field of deep processing of starch, in particular to thermal plasticization treatment of starch. Thermoplastic starch can be used in biodegradable plastics, environmentally friendly hot melt adhesives and other products. Background technique [0002] Starch is an important renewable and biodegradable natural polymer material, which is widely used in food and textile industries. In order to further expand the use of starch in the industrial field, it is desired to turn starch into a thermoplastic polymer material. However, there are a large number of hydroxyl groups on the starch molecule, and its adjacent molecules form strong crystallization through hydrogen bonds, and a large number of molecular chains gather together to form a tight double helix structure, resulting in a hard outer shell for starch crystalline particles. Due to the hydrogen bond interaction generated by a large number of hydroxyl groups on the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/04C08L93/04C08B31/00
CPCC08B31/00C08L3/04C08L93/04
Inventor 陈庆曾军堂
Owner 西安康伟岳利软件科技有限公司
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