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Preparation method for polylactic acid-based alloy material with high strength and toughness

A technology of tough polylactic acid-based and alloy materials, which is applied in the field of preparation of polylactic acid-based alloy materials, can solve the problems of high brittleness and poor cushioning, and achieve the effects of promoting crystallization, improving toughness, and excellent uniformity

Inactive Publication Date: 2016-03-30
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a polylactic acid alloy material with excellent strength and cushioning properties in order to overcome the defects of high brittleness and poor cushioning properties of polylactic acid materials

Method used

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  • Preparation method for polylactic acid-based alloy material with high strength and toughness

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specific Embodiment 1

[0023] A preparation method of a high-strength polylactic acid-based alloy material, which is formed by compounding main materials and auxiliary materials. The main materials include 123.3g hydroxyl-terminated polylactic acid, 73.8g hydroxyl-terminated hyperbranched polyester, and 49.3g ethylene-acrylic acid copolymer. 3.7g polycondensation catalyst, 4.9g nucleating agent, 3.5g antioxidant, 3.2g plasticizer DOP and 2.9g anti-ultraviolet agent UV531.

[0024] After fully drying all raw materials, blend at 60°C for 5-10 minutes in a high-speed blending machine, and then melt and blend in a twin-screw extruder. The processing temperature range is 190°C-210°C, and the screw speed is 400 rpm, the residence time is 2-3 minutes, the extrusion process is vacuumed, and the pressure is lower than 0.01MPa. Granular alloy materials are obtained after drying, cooling and pelletizing.

[0025] The molecular weight of the hydroxyl-terminated polylactic acid is between 100,000-300,000 g / mol,...

specific Embodiment 2

[0029] A preparation method of a high-strength polylactic acid-based alloy material, which is formed by compounding main materials and auxiliary materials. The main materials include 103.2g hydroxyl-terminated polylactic acid, 75.1g hydroxyl-terminated hyperbranched polyester, and 79.7g ethylene-acrylic acid copolymer. 4.2g polycondensation catalyst, 5.1g nucleating agent, 3.91g antioxidant, 3.52g plasticizer DOP and 3.28g anti-ultraviolet agent UV531.

[0030]After fully drying all raw materials, blend at 60°C for 5-10 minutes in a high-speed blending machine, and then melt and blend in a twin-screw extruder. The processing temperature range is 190°C-210°C, and the screw speed is 400 rpm, the residence time is 2-3 minutes, the extrusion process is vacuumed, and the pressure is lower than 0.01MPa. Granular alloy materials are obtained after drying, cooling and pelletizing.

[0031] The molecular weight of the hydroxyl-terminated polylactic acid is between 150,000-300,000 g / mo...

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Abstract

The present invention relates to a preparation method for a polylactic acid-based alloy material with high strength and toughness. The material is prepared from main materials and auxiliary materials by compounding. The main materials comprise hydroxyl-terminated polylactic acid, hydroxyl-terminated hyperbranched polyester and ethylene-acrylic acid copolymer. The auxiliary materials comprise a condensation catalyst, a nucleating agent, an antioxidant, a plasticizer and an anti-UV agent. In the main materials, the mass ratio of the hydroxyl-terminated polylactic acid is between 35% and 55%, the mass ratio of the hydroxyl-terminated hyperbranched polyester is between 25% and 35%, and the mass ratio of ethylene-acrylic acid copolymer is between 10% and 40%. In the auxiliary materials, the using amount of the condensation catalyst accounts for 1%-3% of the mass of the main materials, the using amount of nucleating agent accounts for 1.5%-2.5% of the mass of the main materials, and the mass percentages of the antioxidant, the plasticizer, and the anti-UV agent all account for 1%-2% of the mass of the main materials. The material is prepared through co-melted extrusion, the alloy material has excellent strength and toughness, and the material can be applied to structural materials.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid-based alloy material, in particular to a preparation method of a polylactic acid-based alloy material with high strength and toughness. Background technique [0002] Although plastic materials have excellent performance and wide applicability, they are derived from petroleum products and cannot be degraded. In today's resource crisis and environmental pollution are becoming more and more serious, looking for excellent performance and renewable alternative materials has become the current research field in the field of materials. top priority. [0003] Among the current degradable materials, starch has been deeply studied due to its cheap price and wide range of sources, and a variety of daily and industrial products have been prepared through modification and compounding, such as starch-based films, starch tableware, etc. However, starch has its natural defects. Its mechanical proper...

Claims

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Application Information

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IPC IPC(8): C08L87/00C08L67/04C08L67/00C08L23/08C08G81/02C08K13/02C08K3/34C08K3/26
Inventor 陈一
Owner HUNAN UNIV OF TECH
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