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Method for preparing natural fiber/polylactic acid composite material with anti-flaming function

A natural fiber and composite material technology, which is applied in the field of preparation of natural fiber/polylactic acid composite materials, can solve the problems of reducing the mechanical properties of natural fiber/polylactic acid composite materials, adding a large amount, and low flame retardant efficiency of hydroxides. , to achieve the effect of simple preparation method, avoid secondary combustion, and improve flame retardant performance

Inactive Publication Date: 2008-09-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flame retardant efficiency of hydroxide is low. In order to obtain the ideal flame retardant effect, a large amount needs to be added, which seriously reduces the mechanical properties of natural fiber / polylactic acid composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Soak ramie fibers with an aspect ratio of 5 in an aqueous solution of 0.1 wt% silane coupling agent (KH570) for 24 hours, then dry them to obtain surface-modified natural fibers.

[0025] (2) Soak the surface-modified ramie fiber obtained in step (1) in an ethanol solution of 5 wt % ammonium polyphosphate (APP) for 12 hours, perform flame retardant treatment, and finally dry.

[0026] (3) Vacuum dry the polylactic acid and the flame retardant ammonium polyphosphate at 30° C. for 24 hours to remove moisture.

[0027] (4) polylactic acid after the treatment that step (3) obtains and ammonium polyphosphate, antioxidant tris (2,4-di-tert-butylphenyl) ester are evenly mixed according to a certain ratio, and then in the twin-screw The reaction is carried out in an extruder, and the product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of ammonium polyphosphate is 20wt%, the content of antioxidant is 2wt%, the content of p...

Embodiment 2

[0031] (1) Soak the jute fiber with an aspect ratio of 100 in an aqueous solution of 5 wt % silane coupling agent (KH570) for 1 hour, then dry it to obtain surface-modified natural fibers.

[0032] (2) Soak the surface-modified jute fiber obtained in step (1) in an ethanol solution of ammonium polyphosphate (APP) with a concentration of 0.1 wt% for 24 hours, carry out flame-retardant treatment, and finally dry.

[0033] (3) The polylactic acid and the flame retardant ammonium polyphosphate were vacuum-dried at 120° C. for 1 hour to remove moisture.

[0034] (4) polylactic acid after the treatment that step (3) obtains and ammonium polyphosphate, antioxidant tris (2,4-di-tert-butylphenyl) ester are evenly mixed according to a certain ratio, and then in the twin-screw The reaction is carried out in an extruder, and the product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of ammonium polyphosphate is 5wt%, the content of antioxi...

Embodiment 3

[0038] (1) Soak flax fibers with an aspect ratio of 50 in an aqueous solution of 1 wt% silane coupling agent (KH560) for 5 hours, and then dry them to obtain surface-modified natural fibers.

[0039] (2) Soak the surface-modified jute fiber obtained in step (1) in an ethanol solution of 2.5 wt% ammonium polyphosphate (APP) for 24 hours, carry out flame-retardant treatment, and finally dry.

[0040] (3) The polylactic acid and the flame retardant melamine were vacuum-dried at 60° C. for 10 hours, respectively, to remove moisture.

[0041] (4) the treated polylactic acid obtained in step (3) and flame retardant melamine, antioxidant phenylene diisodecyl phosphite are uniformly mixed according to a certain ratio, and then reacted in a twin-screw extruder, The product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of melamine is 30wt%, the content of antioxidant is 0.5wt%, the content of polylactic acid is 69.5wt%, the screw speed ...

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Abstract

The invention belongs to the high molecular material modification technical field, and in particular relates to a preparation method of natural fiber / poly lactic acid composite material with fire-retarding performance. The preparation method comprises the following steps: the surface modification and the fire-retarding modification of natural fiber are completed to improve the interface combination degree and the fire-retarding performance between the natural fiber and a poly lactic acid matrix; and then, the modified natural fiber is combined with poly lactic acid and fire retardant, thereby obtaining natural fiber-reinforced poly lactic acid composite material with excellent fire-retarding performance, mechanical property and full biodegradation. The poly lactic acid composite material, which can pass the fire-retarding testing in accordance with the standards of Federal Aviation Administration (FAA) and UL94V-O grade testing, can be used in fields such as airplane, automobile and electronic industry, which have strict requirements on material fire-retarding performance and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a preparation method of a natural fiber / polylactic acid composite material with flame-retardant function. Background technique [0002] Polylactic acid (PLA) is a linear aliphatic thermoplastic polyester that can be completely degraded into water and carbon dioxide, and it is becoming more and more important in biomedical and environmental applications. The application of polylactic acid plastics, fibers or films can replace traditional petroleum-based polymer materials in industry, agriculture and daily life, and is known as the most promising "green plastic". The disadvantages of polylactic acid such as poor toughness and low tensile strength limit its application value. Natural fibers not only have low density, high specific performance, and abundant resources, but also can be completely degraded. Therefore, natural fiber / polylactic acid comp...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/02C08J5/06C08K3/32C08K5/526C08K5/3492B29C47/92B29C48/92
CPCB29C47/92C08J2367/04C08J5/045C08J5/06B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 任杰李树茂袁华于涛任天斌
Owner TONGJI UNIV
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