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A kind of metal ion reinforced modified thermoplastic starch and its preparation method and application

A technology of thermoplastic starch and metal ions, which is applied in the field of modified starch to achieve the effects of increasing glass transition temperature, improving processing performance, and increasing tensile strength

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of directly modifying and strengthening thermoplastic starch by adding metal ions has not been reported.

Method used

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  • A kind of metal ion reinforced modified thermoplastic starch and its preparation method and application
  • A kind of metal ion reinforced modified thermoplastic starch and its preparation method and application
  • A kind of metal ion reinforced modified thermoplastic starch and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Starch (CS) was dried at 110°C for 4h. Then 1 mass part of starch (CS) and glycerin were premixed according to 7:3 (wt%). Subsequently, 0.05 parts by mass of calcium gluconate (CG) was crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145°C, screw speed 80 rpm) , granulated to obtain modified starch (TPS-CG-5). The modified starch (TPS-CG-5) was ultrasonically oscillated in deionized water at a ratio of 1g / 200mL for 1h, then stirred at room temperature for 12h, and the filtered residue was added to a Soxhlet extractor, and dehydrated with ethanol at 90°C Stir for 24 hours to obtain the purified calcium ion modified starch (CS / CG-5).

Embodiment 2

[0034] Starch (CS) was dried at 110°C for 4h. Then 1 mass part of starch (CS) and glycerin were premixed according to 7:3 (wt%). Subsequently, 0.10 parts by mass of calcium gluconate (CG) was crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145°C, screw speed 80 rpm) , granulated to obtain TPS-CG-10. Ultrasonic shake TPS-CG-10 in deionized water at a ratio of 1g / 200mL for 1h, then stir at room temperature for 12h, filter the obtained filter residue into a Soxhlet extractor, use absolute ethanol, stir at 90°C for 24h to obtain calcium ions Modified starch (CS / CG-10).

Embodiment 3

[0036] Starch (CS) was dried at 110°C for 4h. Then 1 mass part of starch (CS) and glycerin were premixed according to 7:3 (wt%). Subsequently, 0.15 parts by mass of calcium gluconate (CG) was crushed in a high-speed crusher, mixed with starch / glycerol premixture, and extruded by twin-screw reaction (extrusion temperature 125-145°C, screw speed 80 rpm) , granulated to obtain TPS-CG-15. Ultrasonic shake TPS-CG-15 in deionized water at a ratio of 1g / 200mL for 1h, then stir at room temperature for 12h, filter the obtained filter residue into a Soxhlet extractor, use absolute ethanol, stir at 90°C for 24h to obtain calcium ions Modified starch (CS / CG-15).

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Abstract

The invention discloses a metal-ion-enhanced modified thermoplastic starch with both high mechanical properties and high thermal properties, and a preparation method and application thereof. The preparation method comprises the following steps: pre-mixing starch and glycerin to obtain a pre-mixture; adding calcium gluconate and carrying out mixing; and then carrying out extrusion granulation so asto obtain the modified thermoplastic starch. The modified thermoplastic starch prepared by using the method has good processability and mechanical properties, wherein impact strength is improved to 2.95 J / m to 3.22 J / m, and tensile strength is increased to 6.9 to 7.3 MPa; the modified thermoplastic starch has high thermal stability, wherein a glass transition temperature can be increased by 20 DEG C; and the modified thermoplastic starch also has good calcium ion dispersion and other advantages, effectively overcomes the shortcomings of poor mechanical properties and poor thermal properties of conventional thermoplastic starch, and can be applied to food packaging, disposable food containers and other fields. The preparation method is simple in processing process, friendly to environmentand free of harm and pollution to environment.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and in particular relates to a metal ion-enhanced modified thermoplastic starch with high mechanical properties and high thermal properties, and a preparation method and application thereof. Background technique [0002] Now, petroleum-based plastics have a big impact on the environment. The use of biodegradable polymers to replace plastics prepared from petroleum is a current research hotspot. Among renewable and degradable polymers, starch has the advantages of abundant sources, degradability, and low cost. Therefore, it is widely used in biodegradable plastics. However, the processability and mechanical properties of starch have great defects, which limit the application of starch in degradable plastic products, such as food packaging, disposable food containers, etc. In order to eliminate the hydrogen bonds between starch molecules, make starch have thermoplastic processing charact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08K5/098C08K5/053
CPCC08K5/053C08K5/098C08L3/02
Inventor 张水洞林泽声
Owner SOUTH CHINA UNIV OF TECH
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