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Functionalized carbon nanotube flame-retardant polylactic acid and preparation method thereof

A carbon nanotube and carbon nanotube masterbatch technology, which is applied in the field of materials, can solve the problems of poor mechanical properties of materials, inability to pass materials, and reduced heat release rate, and achieves improved flame retardant performance, mild process conditions, and preparation methods. Simple and effective effects

Inactive Publication Date: 2012-12-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of carbon nanotubes to polymers and their composite materials can improve the mechanical properties of the material and reduce the heat release rate of the material, the addition of carbon nanotubes does not significantly improve the combustion test characteristics of the material, and the material can hardly pass the industrial test. UL94 burning test required
[0007] When using halogen-free flame-retardant thermoplastic materials, although the flame-retardant performance of the material can be improved, the mechanical properties of the material will deteriorate, which greatly limits the application range of the material.

Method used

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  • Functionalized carbon nanotube flame-retardant polylactic acid and preparation method thereof
  • Functionalized carbon nanotube flame-retardant polylactic acid and preparation method thereof
  • Functionalized carbon nanotube flame-retardant polylactic acid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1). Pure polylactic acid, functionalized carbon nanotubes, antioxidant triphenyl phosphite, and anti-dripping agent polytetrafluoroethylene are dried in vacuum at 30°C for 24 hours to remove moisture;

[0032] (2). 2g of pure polylactic acid and 1g of functionalized carbon nanotubes obtained in step (1) were dissolved in 40g of chloroform at 20°C, stirred and mixed, ultrasonically shaken for 1 hour, placed in a fume hood, evaporated the solvent, and dried After drying, the polylactic acid / carbon nanotube "masterbatch" is obtained.

[0033] (3). The polylactic acid / carbon nanotube "masterbatch" obtained in step (2) is pulverized, mixed with 196.6g pure polylactic acid, 0.2g triphenyl phosphite, and 0.2g polytetrafluoroethylene, and then mixed in a twin-screw extruder During extrusion, the product is cooled, pelletized, and dried to obtain functionalized carbon nanotube flame-retardant polylactic acid. The screw speed is 10 rpm, and the reaction extrusion temperature is 150...

Embodiment 2

[0035] (1). The pure polylactic acid, functionalized carbon nanotubes, antioxidant tris(2,4-di-tert-butylphenyl) phosphite, and anti-dripping agent polytetrafluoroethylene are dried in vacuum at 120℃ 1 hour to remove water;

[0036] (2). Dissolve 50g polylactic acid and 5g functionalized carbon nanotubes obtained in step (1) in 5000g chloroform at 20°C, stir and mix, ultrasonically shake for 5 hours, place in a fume hood, evaporate the solvent, and dry , Get the polylactic acid / carbon nanotube "masterbatch".

[0037] (3). The polylactic acid / carbon nanotube "master batch" obtained in step (2) is crushed and mixed with 35g pure polylactic acid, 5g tris(2,4-di-tert-butylphenyl) phosphite, and 5g polytetrafluoroethylene. , And then extrude in a twin-screw extruder, the product is cooled, pelletized, and dried to obtain functionalized carbon nanotube flame-retardant polylactic acid. The screw speed is 250 rpm, and the reaction extrusion temperature is 200°C.

Embodiment 3

[0039] (1) Combine pure polylactic acid, functionalized carbon nanotubes, antioxidant pentaerythritol bisphosphite bis(2,4-di-tert-butylphenyl) ester, and anti-drip agent polytetrafluoroethylene at 80°C Vacuum drying for 2 hours to remove moisture;

[0040] (2). Dissolve 25g of pure polylactic acid and 5g of functionalized carbon nanotubes obtained in step (1) in 500g of chloroform at 50°C, stir and mix, ultrasonically shake for 3 hours, place in a fume hood, evaporate the solvent, and bake After drying, the polylactic acid / carbon nanotube "masterbatch" is obtained.

[0041] (3). The polylactic acid / carbon nanotube "masterbatch" obtained in step (2) is crushed and mixed with 462g pure polylactic acid, 3g pentaerythritol bisphosphite bis(2,4-di-tert-butylphenyl) ester, and 5g polytetrafluoroethylene The ethylene is uniformly mixed and then extruded in a twin-screw extruder. The product is cooled, pelletized, and dried to obtain functionalized carbon nanotube flame-retardant polyla...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to functionalized carbon nanotube flame-retardant polylactic acid and a preparation method thereof. The preparation method comprises the following specific steps of: firstly blending functionalized carbon nanotubes with phosphorus flame-retardant group DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and polylactic acid resin to obtain a polylactic acid master batch containing the functionalized carbon nanotubes; and adding the polylactic acid master batch, polylactic acid, an antioxidant and an anti-dropping agent to an extruder according to a certain ratio, and blending and extruding to obtain the polylactic acid with a flame-retardant function. The obtained polylactic acid material has better flame retardancy; at the same time, compared with the pure polylactic acid, the mechanical properties of the material are maintained or improved; and the preparation method of the functionalized carbonnanotube flame-retardant polylactic acid is simple and effective, has mild process conditions and is suitable for batch production.

Description

Technical field [0001] The invention belongs to the technical field of materials, and relates to a functionalized carbon nanotube flame-retardant polylactic acid and a preparation method thereof. The obtained material has better flame-retardant performance and mechanical properties. Background technique [0002] Polylactic acid is a kind of "green polymer" material derived from the starch of renewable plants (such as cassava, sweet sorghum) and can be completely degraded into carbon dioxide and water. Polylactic acid is not only degradable, but also has many good mechanical and processing properties, and is called the "green plastic" with the best prospects. However, polylactic acid, like other polymers, is easy to burn, which limits its application in aviation, electronics, automobiles and other fields. It is necessary to give polylactic acid flame retardant properties through a modified method. [0003] The blending of additive flame retardants and polymer materials is a common ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/04C08K7/00C08K3/04C08J3/22
Inventor 于涛李岩
Owner TONGJI UNIV
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