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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  • 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 t

Method used

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  • Thermoplastic starch and preparation method thereof

Examples

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Example Embodiment

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

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

[0042]③ Homogenization: Homogenize the secondary treated cassava residue under the condition of 100Mpa for 3 times for 20 minutes each time to obtain the third treated cassava residue;

[0043]④Modification: Add 3% by weight of acetic anhydride and 1% by weight of silane coupling agent KH550 to the tertiary treatment cassava residue, stir and react for 2h at a temperature of 70°C at a speed of 1000r / min to obtain Treat cassa...

Example Embodiment

[0045]Preparation Example 2: ① Alkali gelatinization: Take 25kg of cassava residue with a fineness of 60 mesh and 100kg of water, heat it to 85°C, then add 1.5kg of 6wt% sodium hydroxide solution, heat and stir for 15min at a speed of 200r / min, then The temperature is raised to 95°C, and the temperature is kept and stirred at a speed of 200r / min for 25 minutes to obtain the primary processed cassava residue;

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

[0047]③ Homogenization: Homogenize the secondary treated cassava residue at 110Mpa for 4 times, 25min each time, to obtain the third treated cassava residue;

[0048]④Modification: Add 4% by weight of acetic anhydride and 1.5% by weight of silane coupling agent KH550 to the tertiary treatment cassava residue, and stir for 2-3h at a temperature of 75℃ at a speed of 1500r / min. , Get the cassava re...

Example Embodiment

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

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

[0052]③ Homogenization: Homogenize the secondary treated cassava residue at 120Mpa for 5 times for 30 minutes each time to obtain the third treated cassava residue;

[0053]④ Modification: Add 5% by weight of acetic anhydride and 2% by weight of silane coupling agent KH550 to the tertiary treatment cassava residue, and stir and react for 3h at a temperature of 80°C at a speed of 2000r / min to obtain Treat cassava residue four times;

[...

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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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