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Natural fiber reinforced polylactic acid composite material having functionalized DOPO flame retardant and method for preparing same

A technology of natural fibers and composite materials, applied in the field of materials, can solve the problems of reducing the mechanical properties of materials, and achieve the effect of simple and effective preparation methods and mild process conditions

Inactive Publication Date: 2012-10-24
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of DOPO flame retardant is that it will obviously reduce the mechanical properties of the material after adding

Method used

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  • Natural fiber reinforced polylactic acid composite material having functionalized DOPO flame retardant and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Dissolve 162g DOPO and 43.5g maleic acid in 800g ethanol solution, add to the reactor with stirrer and reflux condenser, stir and heat to 90°C, and reflux for 30 hours. Cool to room temperature and filter, collect the filter cake, and dry at 90°C for 10 hours to obtain the functionalized flame retardant DOPO.

[0034] (2) The flame retardant DOPO obtained in step (1) and polylactic acid, flax continuous long fiber, antioxidant phosphite tris(2,4-di-tert-butylphenyl) ester, anti-dripping agent polytetrafluoroethylene Vinyl fluoride was vacuum dried at 80°C for 16 hours to remove moisture;

[0035] (3) Take the dry 520g polylactic acid, 100g DOPO, 10g phosphite tris(2,4-di-tert-butylphenyl) ester, and 15g polytetrafluoroethylene obtained in step (2) and mix them uniformly in a high-speed mixer at 60°C Mix to obtain a mixed material.

[0036] (4) The mixture obtained in step (3) and 355g of flax fibers were added to a twin-screw extruder for extrusion, and the produc...

Embodiment 2

[0038] (1) Dissolve 162g DOPO and 118.5g itaconic acid in 600g ethanol solution, add to the reactor with stirrer and reflux condenser, stir and heat to 70°C, reflux for 40 hours. Cool to room temperature and filter, collect the filter cake, and dry at 100°C for 10 hours to obtain the functionalized flame retardant DOPO.

[0039] (2) The flame retardant DOPO and polylactic acid obtained in step (1), bamboo fiber with an aspect ratio of 5, the antioxidant tris(nonylphenyl phosphite), and the anti-dripping agent polytetrafluoroethylene were respectively heated at 60°C Dry under vacuum for 20 hours to remove moisture;

[0040] (3) Take 810g of dried polylactic acid obtained in step (2), 70g of flame retardant DOPO, 30g of tris(nonylphenyl phosphite), and 20g of polytetrafluoroethylene and mix them uniformly in a high-speed mixer at 70°C to obtain a mixture material.

[0041] (4) Add the mixture obtained in step (3) and 70g of bamboo fiber into a twin-screw extruder for extrusion...

Embodiment 3

[0043] (1) Dissolve 162g DOPO and 87g maleic acid in 1000g ethanol solution, add to the reactor with stirrer and reflux condenser, stir and heat to 100°C, reflux for 20 hours. Cool to room temperature and filter, collect the filter cake, and dry at 80°C for 12 hours to obtain the functionalized flame retardant DOPO.

[0044](2) The flame retardant DOPO and polylactic acid obtained in step (1), ramie yarn, the antioxidant triphenyl phosphite, and the anti-dripping agent polytetrafluoroethylene were vacuum-dried at 50°C for 24 hours to obtain remove moisture;

[0045] (3) Take 977g of dry polylactic acid obtained in step (2), 10g of flame retardant DOPO, 1g of triphenyl phosphite, and 1g of polytetrafluoroethylene and mix them uniformly in a high-speed mixer at 80°C to obtain a mixed material.

[0046] (4) Add the mixture obtained in step (3) and 10 g of ramie fiber into a twin-screw extruder for extrusion, and the product is cooled, pelletized, and dried to obtain a functional...

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Abstract

The invention belongs to the technical field of material, and specially relates to a functionalized DOPO flame retardant polylactic acid and a method for preparing the same. The preparation method comprises a step of preparing the functionalized DOPO, a step of mixing the functionalized DOPO, the polylactic acid, a anti-oxidant and a anti-dripping agent, and a step of extruding the mixture and a natural fiber with blending in a twin-screw extruder to get the biodegradable natural fiber reinforced polylactic acid composite material having the functionalized DOPO flame retardant. The composite material has relatively good flame retardation performance, and can maintain or improve mechanical properties of materials with respect to pure polylactic acid. The preparation method is simple and effective, mild in technology condition and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a functionalized DOPO flame-retardant natural fiber reinforced polylactic acid composite material and a preparation method thereof. The obtained composite material has good flame-retardant properties and mechanical properties. Background technique [0002] Natural fibers are abundant in nature, especially in plants. It has the advantages of low price, low density, easy biodegradation, low carbon dioxide emission, excellent heat insulation and sound insulation performance, and high specific modulus. Natural fibers include stem fibers (bamboo, wood, bagasse, sorghum stalks, straw, etc.), fruit fibers (coconut shell, peanut shell, etc.), bast fibers (flax, jute, hemp, jute, palm, etc.) , sunflower, etc.), leaf fibers (sisal, reed, thatch, etc.). At present, the research on natural fiber-reinforced composite materials mainly uses natural plant fibers as reinforcement materials and ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L97/02C08L27/18C08K5/5313C08K5/526B29C47/92B29C48/92
CPCB29C48/0022B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 于涛李岩朱明毅杨刚
Owner TONGJI UNIV
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