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Biodegradable toughened heat-resistant polylactic acid modified resin and preparation method thereof

A modified resin and biodegradable technology, applied in the field of biodegradable, toughened and heat-resistant polylactic acid modified resin and its preparation, can solve problems such as unsatisfactory starch processing performance, achieve good complete biodegradability, reduce Production cost, equipment requirements and the effect of simple process flow

Inactive Publication Date: 2015-03-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a large number of hydroxyl groups in the starch molecular chain, so that a large number of hydrogen bonds are formed between the molecules and within the molecule, which makes the processing performance of the starch unsatisfactory, and it is often necessary to use molecular modification to make it have a certain degree of plasticity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A biodegradable toughened heat-resistant polylactic acid modified resin, which comprises the following raw materials by mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight 100,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% γ-glycidyloxypropyltrimethoxysilane and 1% antioxidant 1010.

[0027] Dry each raw material at 80°C for 12 hours, then add it to a high-speed mixer at 800r / min and blend for 20 minutes according to the above mass percentage. 1. The biodegradable toughened heat-resistant polylactic acid modified resin is obtained by plasticizing, extruding and granulating under the condition that the rotating speed of the main screw is 150 rpm.

[0028] The biodegradable toughened heat-resistant polylactic acid modified resin obtained in this example has a heat-resistant temperature of 91° C., a tensile breaking strength and a tensile modulus as high as 81 MPa and 2871 MPa, respectively.

Embodiment 2

[0030] A biodegradable toughened heat-resistant polylactic acid modified resin, which comprises the following raw materials by mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight: 300,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% γ-glycidyloxypropyltrimethoxysilane and 1% antioxidant 1010.

[0031] Dry each raw material at 80°C for 12 hours, then add it to a high-speed mixer at 800r / min and blend for 20 minutes according to the above mass percentage. 1. The biodegradable toughened heat-resistant polylactic acid modified resin is obtained by plasticizing, extruding and granulating under the condition that the rotating speed of the main screw is 150 rpm.

[0032] The biodegradable toughened heat-resistant polylactic acid modified resin obtained in this example has a heat-resistant temperature of 95° C., a tensile breaking strength and a tensile modulus as high as 85 MPa and 2893 MPa, respectively.

Embodiment 3

[0034] A biodegradable toughened heat-resistant polylactic acid modified resin, which comprises the following raw materials by mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight 20,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% γ-glycidyloxypropyltrimethoxysilane and 1% antioxidant 1010.

[0035] Dry each raw material at 80°C for 12 hours, then add it to a high-speed mixer at 800r / min and blend for 20 minutes according to the above mass percentage. 1. The biodegradable toughened heat-resistant polylactic acid modified resin is obtained by plasticizing, extruding and granulating under the condition that the rotating speed of the main screw is 150 rpm.

[0036]The biodegradable toughened heat-resistant polylactic acid modified resin obtained in this example has a heat-resistant temperature of 82° C., a tensile breaking strength and a tensile modulus as high as 77 MPa and 2830 MPa, respectively.

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Abstract

The invention discloses biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. The polylactic acid modified resin comprises the following raw materials in percentage by mass: 30%-90% of polylactic acid, 5%-65% of thermoplastic starch, 3%-40% of a completely biodegradable plant fiber and 1%-10% of an adjuvant, wherein the adjuvant is a lubricating agent, a coupling agent and an antioxidant. The method comprises the following steps: firstly drying various raw materials, adding to a high-speed mixer according to the ratio, and mixing for 5-30 minutes; and adding the obtained mixture to a twin-screw extruder, and plastifying, extruding and pelletizing to obtain the biodegradable toughened heat-resistant polylactic acid modified resin. The preparation method of the polylactic acid modified resin disclosed by the invention is simple in equipment requirements and technological process, low in cost, easy for large-scale production, economical and efficient; and the thermoplastic starch and the completely biodegradable plant fiber are added to polylactic acid matrix, so that the prepared product has relatively good heat resistance and impact property.

Description

technical field [0001] The invention belongs to the field of biodegradable polymer material blending and polymer molding processing, and specifically relates to a biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. Background technique [0002] Polylactic acid is a class of aliphatic polyesters from renewable resources with good biocompatibility and biodegradability. In the natural environment, due to hydrolysis or degradation by microorganisms, polylactic acid can eventually be decomposed into carbon dioxide and water. With the improvement of people's awareness of environmental protection and the rising price of traditional petroleum-based polymers, polylactic acid has received more and more attention, and its application fields have also continued to expand, from biomedical applications to packaging, fibers, and then to electronic products, It is expected to become one of the most important materials in the 21st century ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L97/02B29C47/92B29B9/06B29C48/92
Inventor 陈晨朱小康何本祥颜锦江
Owner SICHUAN UNIV
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