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Thermoplastic starch and preparation method thereof

A technology of thermoplastic starch and corn starch, which is applied in the field of degradable polymer materials, can solve the problems of uneven distribution of components in the blend system, affecting the processing performance of thermoplastic starch, and affecting the dispersibility of starch, so as to reduce viscosity and achieve hydrophilicity properties, improve the plasticizing effect, improve the effect of processing performance

Active Publication Date: 2021-01-19
QINGDAO ZHOUSHI PLASTIC PACKAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The thermoplastic starch can be enhanced by utilizing the network structure of natural cellulose, but because the surface of cellulose particles contains a large number of easily hydrophilic hydroxyl groups, the cellulose particles are easily agglomerated through the interaction of hydrogen bonds, It affects its dispersibility in starch, and it is prone to uneven distribution of components in the blend system and excessive viscosity during processing, which affects the processing performance of thermoplastic starch

Method used

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  • Thermoplastic starch and preparation method thereof

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Effect test

preparation example 1

[0040]Preparation example 1: ①Alkali gelatinization: Take 20kg of cassava residue with a fineness of 60 mesh and 100kg of water, heat to 80°C, then add 1kg of 5wt% sodium hydroxide solution, keep stirring at a speed of 200r / min for 10min, and then heat up To 90°C, keep stirring at a speed of 200r / min for 20min to obtain primary treated cassava residue;

[0041] ② Dispersion: After cooling down the primary treated cassava residue to 50°C, add 0.5 kg of sodium trimetaphosphate, and stir at a speed of 200 r / min for 3 minutes to obtain secondary processed cassava residue;

[0042] ③ Homogenization: Under the condition of 100Mpa, the secondary treated cassava residues were homogenized 3 times, each time for 20 minutes, to obtain three times processed cassava residues;

[0043] ④Modification: Add 3% of its weight of acetic anhydride and its weight of 1% of its weight of silane coupling agent KH550 to cassava residues treated three times, and stir and react at a speed of 1000r / min fo...

preparation example 2

[0045] Preparation example 2: 1. Alkali gelatinization: take 25kg of cassava residues with a fineness of 60 mesh and 100kg of water, heat to 85°C, then add 1.5kg of 6wt% sodium hydroxide solution, keep stirring at a speed of 200r / min for 15min, and then Raise the temperature to 95°C, keep stirring at a speed of 200r / min for 25min, and obtain primary processed cassava residue;

[0046] ②Dispersion: after cooling down the primary treated cassava residue to 52°C, add 0.75 kg of sodium trimetaphosphate, and stir at a speed of 200 r / min for 3 minutes to obtain secondary processed cassava residue;

[0047] ③ Homogenization: Under the condition of 110Mpa, the secondary treated cassava residues were homogenized 4 times, each time for 25 minutes, to obtain three times processed cassava residues;

[0048] ④Modification: add 4% acetic anhydride and 1.5% silane coupling agent KH550 to cassava residues treated three times, and stir at 1500r / min for 2-3 hours at a temperature of 75°C , to ...

preparation example 3

[0050] Preparation example 3: ①Alkali gelatinization: Take 30kg of cassava residue with a fineness of 60 mesh and 100kg of water, heat to 90°C, then add 2kg of 7wt% sodium hydroxide solution, keep stirring at a speed of 200r / min for 20min, and then heat up To 100°C, keep stirring at a speed of 200r / min for 30min to obtain primary treated cassava residue;

[0051] ② Dispersion: After cooling down the primary treated cassava residues to 55°C, add 1 kg of sodium trimetaphosphate, and stir for 3 minutes at a speed of 200 r / min to obtain secondary processed cassava residues;

[0052] ③ Homogenization: Under the condition of 120Mpa, the secondary treated cassava residues were homogenized 5 times, each time for 30 minutes, to obtain three times processed cassava residues;

[0053] ④Modification: Add 5% of its weight of acetic anhydride and its weight of 2% of its weight of silane coupling agent KH550 to cassava residues treated three times, and stir and react at a speed of 2000r / min ...

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Abstract

The invention relates to the field of degradable high polymer materials, and particularly discloses thermoplastic starch and a preparation method thereof. The thermoplastic starch comprises the following components in parts by weight: 30-50 parts of corn starch, 30-50 parts of cassava starch, 20-30 parts of modified cassava residues, 8-10 parts of a plasticizer and 0.2-0.4 part of a lubricant, wherein the modified manioc residue is prepared by performing alkali gelatinization, dispersion and homogenization treatment on manioc waste and performing modification treatment on the manioc waste by acetic anhydride and a silane coupling agent. The cassava starch and the corn starch are used as matrixes, and the modified fibers and the modified starch which are prepared from the cassava residues are added, so that resources can be recycled, the cost is reduced, and the heat resistance and the water resistance of the thermoplastic starch can be improved; moreover, the cassava residues are modified, so that the dispersity of the cassava residues in starch can be improved, the mixing uniformity of the raw materials is improved, and the processability of the cassava residues is improved.

Description

technical field [0001] The application relates to the field of degradable polymer materials, more specifically, it relates to a thermoplastic starch and a preparation method thereof. Background technique [0002] The English name of thermoplastic starch is Thermoplastic starch or Thermoplastically Processible Starch, or TPS for short. It is a degradable and environmentally friendly material with a wide range of sources. Thermoplastic starch is blended with plasticizers such as glycerin and ethylene glycol under high temperature and mechanical shear conditions. At this time, the hydrogen bond between starch molecules is weakened, because the plasticizer contains hydroxyl groups, amino groups, and amides. Groups such as radicals can form new hydrogen bonds with hydroxyl groups in starch molecules, hinder the recrystallization of starch, reduce the crystallinity of starch, and make it plastic. Because thermoplastic starch materials have the advantages of excellent biodegradabi...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L99/00C08K5/53C08K5/092C08K5/09C08K5/20
CPCC08L3/02C08L2205/025C08L2205/03C08L2201/06C08L99/00C08K5/53C08K5/092C08K5/09C08K5/20
Inventor 李双利周锐
Owner QINGDAO ZHOUSHI PLASTIC PACKAGE
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