Flame-retardant natural fiber reinforced polylactic acid composite material and preparation method thereof

A technology of natural fibers and composite materials, applied in the field of materials, can solve the problems of deteriorated ramie fiber and polylactic acid interface, poor bonding of polylactic acid and ramie fiber interface, etc., and achieves a simple and effective preparation method, good flame retardant performance and mechanical properties, The effect of mild process conditions

Inactive Publication Date: 2014-04-16
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Then the interfacial bonding between PLA and ramie fibers is poor, and the addition of flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) may further deteriorate the ramie fibers and PLA interface

Method used

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  • Flame-retardant natural fiber reinforced polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Polylactic acid, jute yarn, functional flame retardant DOPO, antioxidant tris(2,4-di-tert-butylphenyl) phosphite, nano-montmorillonite, anti-dripping agent polytetrafluoroethylene Ethylene was vacuum dried at 70°C for 20 hours to remove moisture;

[0039] (2) Take the dry 498.5g polylactic acid obtained in step (1), 0.5g nano-montmorillonite, 0.5g tris(2,4-di-tert-butylphenyl) phosphite, and 0.5g polytetrafluoroethylene in Mix uniformly at 70° C. in a high-speed mixer to obtain a mixed material. Then put it into a twin-screw extruder for extrusion, the product is cooled, pelletized, and dried, the screw speed is 100 rpm, and the reaction extrusion temperature is 180°C.

[0040] (3) Add 100g of jute fiber and 10g of flame retardant into 500ml of ethanol, soak for 1 hour, take out the jute fiber, and dry at 50°C for 30 hours.

[0041] (4) Add 450g of the mixture obtained in step (2) and 50g of the jute fiber obtained in step (3) into a twin-screw extruder for extrus...

Embodiment 2

[0043] (1) Vacuum dry polylactic acid, hemp continuous long fiber, flame retardant, antioxidant phenylene diisodecyl phosphite, nano-montmorillonite, and anti-dripping agent polytetrafluoroethylene at 60°C for 18 hours, respectively, to remove moisture;

[0044] (2) Take 405g of dry polylactic acid obtained in step (1), 75g of nano-montmorillonite, 15g of phenylene diisodecyl phosphite, and 5g of polytetrafluoroethylene and mix them uniformly in a high-speed mixer at 60°C to obtain a mixed material. Then put it into a twin-screw extruder for extrusion, the product is cooled, pelletized, and dried, the screw speed is 150 rpm, and the reaction extrusion temperature is 185°C.

[0045] (3) Add 100g of hemp fiber and 3g of flame retardant into 500ml of ethanol, soak for 10 hours, take out the hemp fiber, and dry at 130°C for 1 hour.

[0046] (4) Add 100g of the mixture obtained in step (2) and 1g of hemp fiber in step (3) to a twin-screw extruder for extrusion. The product is cool...

Embodiment 3

[0048](1) Vacuum dry polylactic acid, bamboo fiber with an aspect ratio of 5, flame retardant, antioxidant tris(nonylphenyl phosphite), carbon nanotubes, and anti-dripping agent polytetrafluoroethylene at 60°C 20 hours to remove moisture;

[0049] (2) Take 445g of dry polylactic acid obtained in step (1), 5g of carbon nanotubes, 30g of tris(nonylphenyl phosphite), and 20g of polytetrafluoroethylene and mix them uniformly in a high-speed mixer at 70°C to obtain a mixed material . Then put it into a twin-screw extruder for extrusion, the product is cooled, pelletized, and dried, the screw speed is 50 rpm, and the reaction extrusion temperature is 175°C.

[0050] (3) Add 100g of bamboo fiber and 20g of flame retardant into 500ml of ethanol, soak for 5 hours, take out the bamboo fiber, and dry at 100°C for 5 hours.

[0051] (4) Add 100g of the mixture obtained in step (2) and 30g of bamboo fiber in step (3) to a twin-screw extruder for extrusion. The product is cooled, pelletize...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a flame-retardant natural fiber reinforced polylactic acid composite material and a preparation method of the flame-retardant natural fiber reinforced polylactic acid composite material, being used for the fields of electronics and the like. The preparation method comprises the specific steps of firstly, blending dried polylactic acid, an nanometer additive, an antioxidant and anti-dropping agent according to the proportion respectively, and extruding; mixing a fire retardant and natural fibers, and finally adding blending materials of natural fibers and polylactic acid subjected to fire retardant treatment into an extruder according to certain proportion, and blending and extruding to obtain the flame-retardant natural fiber reinforced polylactic acid composite material. The composite material has good flame retardant property and mechanical property, the preparation method is simple and effective, the process conditions are moderate, and the flame-retardant natural fiber reinforced polylactic acid composite material is suitable for batch production.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a flame-retardant natural fiber-reinforced polylactic acid and a preparation method thereof. The obtained material has good flame-retardant properties and mechanical properties, and can be used in the field of packaging of electronic appliances. Background technique [0002] With the request of composite materials for flame retardant, the research on new varieties of various flame retardants is becoming more and more active, and the development trend is always to improve thermal stability and improve flame retardant efficiency. At present, flame retardants are not only required to have good flame retardant properties, but also to have halogen-free, non-toxic and smoke-suppressing functions, while not degrading the performance of materials too much. Therefore, traditional flame retardants are facing many difficulties. This provides a good development space for environmental flame ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K5/5397C08K3/34C08K7/00C08J5/06C08L1/02
Inventor 于涛李岩朱明毅杨刚
Owner TONGJI UNIV
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