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Flame-retardant toughened polylactic acid-based composite material as well as preparation and application thereof

A composite material and polylactic acid technology are applied in the field of flame-retardant and toughened polylactic acid-based composite materials and their preparation, which can solve the problems of poor thermal stability and low melt strength, and achieve improved compatibility, high flame retardant efficiency, The effect of improving the flame retardant efficiency

Pending Publication Date: 2020-10-13
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of brittleness, low melt strength and poor thermal stability of traditional polylactic acid plastics, and provide a polylactic acid-based composite material with both flame retardancy and toughening properties

Method used

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  • Flame-retardant toughened polylactic acid-based composite material as well as preparation and application thereof
  • Flame-retardant toughened polylactic acid-based composite material as well as preparation and application thereof
  • Flame-retardant toughened polylactic acid-based composite material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Preparation of modified flame retardant: first, dry polylactic acid and flame retardant DOPO-HQ at a drying temperature of 80°C and a drying time of 4 hours;

[0068] Then, 20g of the flame retardant DOPO-HQ was mixed evenly with 100g of polylactic acid, and then added to the twin-screw extruder for melt blending. After extrusion, modified flame retardant particles with polylactic acid molecules attached to the surface were obtained.

[0069] Among them, the temperature of each section in the twin-screw extruder is: 170°C for the first section, 180°C for the second section, 190°C for the third section, 190°C for the fourth section, and 185°C for the fifth section. The residence time is 6s;

[0070] (2) Preparation of composite material: 25g (5wt%) of modified flame retardant particles obtained in step (1) and 500g of polylactic acid matrix resin are added to a twin-screw extruder for secondary melt blending, and the twin-screw extruder The temperature of each secti...

Embodiment 2

[0073] (1) Preparation of modified flame retardant: same as step (1) in Example 1;

[0074] (2) Preparation of composite material: 37.5g (7.5wt%) of the modified flame retardant particles obtained in step (1) and 500g of polylactic acid matrix resin are added in a twin-screw extruder to carry out secondary melt blending, and the twin-screw The temperature of each section of the extruder is respectively: the temperature of the first zone is 160°C, the temperature of the second zone is 170°C, the temperature of the third zone is 175°C, the temperature of the fourth zone is 180°C, and the temperature of the fifth zone is 190°C. The screw speed is 260rpm / min, and the feeding frequency is 8Hz.

[0075] Finally, the target polylactic acid-based flame-retardant and toughened composite material particles were prepared.

Embodiment 3

[0077] (1) Preparation of modified flame retardant: first, dry polylactic acid and flame retardant DOPO-MAH at a drying temperature of 80°C and a drying time of 4 hours.

[0078] Then, flame retardant DOPO-MAH 20g (20wt%), mixed with polylactic acid 100g, added in the twin-screw extruder, melt blending, obtained modified flame retardant particles after extrusion,

[0079] Among them, the temperature of each section in the twin-screw extruder is: 170°C for the first section, 180°C for the second section, 190°C for the third section, 190°C for the fourth section, and 185°C for the fifth section. The residence time is 6s;

[0080] (2) Preparation of composite material: 37.5g (7.5wt%) of the modified flame retardant particles obtained in step (1) and 500g of polylactic acid matrix resin are added in a twin-screw extruder to carry out secondary melt blending, and the twin-screw The temperature of each section of the extruder is respectively: the temperature of the first zone is 16...

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Abstract

The invention belongs to the technical field of flame-retardant toughened modified polymers, and particularly relates to a flame-retardant toughened polylactic acid-based composite material and a preparation method thereof. The composite material comprises a polylactic acid matrix and a modified flame retardant; the modified flame retardant comprises a polylactic acid modified reactive halogen-free flame retardant; the reactive halogen-free flame retardant is a halogen-free flame retardant with the surface containing reactive groups. The invention also provides a preparation method of the composite material. The preparation method comprises the following steps of: 1) mixing a reactive flame retardant with polylactic acid, and carrying out melt blending extrusion to obtain a polylactic acid-modified reactive flame retardant; and (2) carrying out melt blending extrusion on the product obtained in the step (1) and a polylactic acid matrix to obtain the flame-retardant toughened polylacticacid-based composite material. According to the polylactic acid-based composite material provided by the invention, the compatibility between the flame retardant and the polylactic acid matrix is effectively improved, the flame retardant efficiency of the material is high, the mechanical property of the material is relatively good, the process of the material is easy to master, green and environment-friendly; the production cost of the material is low; and the mass production of the material is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant and toughened modified polymers, and in particular relates to a flame-retardant and toughened polylactic acid-based composite material and its preparation method and application. Background technique [0002] With the decrease of petrochemical resources and the seriousness of environmental pollution, the demand for the use of renewable and degradable polymer materials is increasing. As a renewable and degradable bio-based plastic, polylactic acid has the advantages of wide source of raw materials, high transparency, high stiffness, etc. It has been developed and applied in the fields of electronic appliances, automobiles, rail transit and so on. However, PLA is not only as flammable as most petroleum-based plastics, but also has low impact resistance, which hinders its further application and development. Therefore, how to simultaneously improve the flame retardancy and toughness of PLA i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/91
CPCC08L67/04C08G63/912C08L2201/02C08L2205/025
Inventor 龙丽娟徐文静秦舒浩于杰向宇姝黄绍文李娟徐国敏
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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