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

A modified resin and biodegradable technology, which is applied in the field of biodegradable toughened heat-resistant polylactic acid modified resin and its preparation, can solve the problems of unsatisfactory starch processing performance and meet equipment requirements and process flow with simple and good performance. Processability and the effect of reducing production cost

Inactive Publication Date: 2018-03-27
HEILONGJIANG XINDA ENTERPRISE GRP
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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

[0024] A biodegradable heat-resistant polylactic acid modified resin, which contains the following raw materials in terms of mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight: 100,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% gamma glycidyl etheroxypropyl trimethoxysilane and 1% antioxidant 1010.

[0025] Dry each raw material at 80°C for 12 hours, then add the above-mentioned mass percentage to a high-speed mixer at 800r / min and blend for 20 minutes. 1. Under the condition of the rotating speed of the main screw being 150rpm, the biodegradable toughened heat-resistant polylactic acid modified resin can be obtained by plasticizing, extruding and granulating.

[0026] The biodegradable increased-cut 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

[0028] A biodegradable increase-cut heat-resistant polylactic acid modified resin, which comprises the following raw materials in technical mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight 300,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% gamma glycidyl etheroxypropyl trimethoxysilane and 1% antioxidant 1010.

[0029] Dry each raw material at 80°C for 12 hours, then add the above-mentioned mass percentage to a high-speed mixer at 800r / min and blend for 20 minutes. 1. Under the condition of the rotating speed of the main screw being 150rpm, plasticizing, extruding and granulating can obtain the biodegradable increased-cut heat-resistant polylactic acid modified resin.

[0030] The biodegradable increased-cut heat-resistant polylactic acid modified resin obtained in this example has a heat-resistant temperature of 95°C, and its tensile breaking strength and tensile modulus are as high as 85 MPa and 2893 MPa, respectively.

Embodiment 3

[0032] A biodegradable heat-resistant polylactic acid modified resin, which contains the following raw materials in terms of mass percentage: 70% poly DL-lactic acid (viscosity average molecular weight 20,000), 15% thermoplastic starch, 10% Ramie fiber, 2% stearic acid, 2% gamma glycidyl etheroxypropyl trimethoxysilane and 1% antioxidant 1010.

[0033] Dry each raw material at 80°C for 12 hours, then add the above mass percentage to a high-speed mixer at 800r / min and blend for 20 minutes. 1. Under the condition of the rotating speed of the main screw being 150rpm, the biodegradable toughened heat-resistant polylactic acid modified resin can be obtained by plasticizing, extruding and granulating.

[0034] The biodegradable increased-cut 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 a biodegradable toughened heat-resistant polylactic acid modified resin and a preparation method thereof. The polylactic acid modified resin comprises the following raw materials by mass: 30-90% of polylactic acid, 5-65% of thermoplastic starch, 3-40% of fully biodegradable plant fibers and 1-10% of auxiliary agents, wherein the auxiliary agents are composed of a lubricant,a coupling agent and an antioxidant. The above raw materials are dried at first and then added into a high-speed mixer for blending for 5-30 minutes, and the obtained mixture is added into a twin-screw extruder for plastification, extrusion and granulation so as to prepare the biodegradable toughened heat-resistant polylactic acid modified resin. The preparation method of the invention is low inrequirements on equipment, simple in process flow, low in cost, easy to realize mass production, economic and highly efficient; and good heat resistance and impact properties of the produced resin areensured by adding the thermoplastic starch and fully biodegradable plant fibers into a polylactic acid matrix.

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 to electronic products, automobiles It is expected to become one of the most important materials in the 21st centur...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/02C08L97/02B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92704C08L67/04C08L2201/06C08L2201/08C08L2205/03C08L2205/035C08L2205/16C08L3/02C08L97/02
Inventor 李明珏崔成杰谢众
Owner HEILONGJIANG XINDA ENTERPRISE GRP
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