Polylactic acid/vegetable sponge fiber composite material and method for making same

A technology of loofah fiber and composite material, which is applied in the field of polylactic acid/loofah fiber composite material and its preparation, can solve the problems of inapplicable biodegradable thermoplastics, etc., and achieve the effect of improving heat distortion temperature and reducing cost

Inactive Publication Date: 2008-05-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not suitable for the modification of biodegradable thermoplastics such as polylactic acid

Method used

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  • Polylactic acid/vegetable sponge fiber composite material and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: 100 parts of vacuum-dried pure polylactic acid PLLA was melt-processed in a torque rheometer at 190°C and 32 rpm for 8 minutes, and then hot-pressed at 190°C for 5 minutes in a thermocompression molding machine to form a thin plate. Its performance is shown in Table 1.

Embodiment 2

[0027] Embodiment 2: the loofah fiber is cut into pieces, cleaned with clear water, pulverized after vacuum drying for 8 hours, and sieved with a 50-mesh sieve; by mass percentage, 10 parts of loofah fiber, 70 parts of concentration of NaOH solution and 20 parts of absolute ethanol solution were mixed together and azeotroped for 2 hours, during which NaOH and absolute ethanol were continuously added to keep the ratio between the loofah fibers, NaOH solution and absolute ethanol; then deionized water washing until the pH value is 7, filter with suction, and dry the obtained loofah fiber in an oven at 80°C for 8 hours; by mass percentage, 5 parts of the above-mentioned alkali-treated loofah fiber, 1 part of silane coupling agent γ-glycidol Ether propyltrimethoxysilane, 85 parts of absolute ethanol, 1 part of 0.1mol / L hydrochloric acid solution and 8 parts of deionized water were refluxed and stirred for 2 to 4 hours. Dry in oven for 12 hours. The organically modified loofah fib...

Embodiment 3

[0029] Embodiment 3: Loofah modification method is the same as embodiment 2, wherein the silane coupling agent is gamma-aminopropyl triethylsiloxane. After mixing 97 parts of vacuum-dried PLLA, 3 parts of modified loofah fiber, 0.1 part of lubricant calcium stearate and 0.1 part of heat stabilizer epoxy soybean oil, put them in a torque rheometer at 190 °C with a rotation speed of Melt blending was performed at 32 rpm for 8 minutes, and then hot pressed at 190° C. for 5 minutes in a thermocompression molding machine to form a thin plate. Its performance is shown in Table 1.

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Abstract

The invention relates to a polylactic acid / vegetable sponge fiber composite material and the preparation method. The new fully biodegradable composite material can significantly improve the heat-resistant property of the polylactic acid, has good mechanical properties and can reduce the cost of raw material, which is favorable for the polylactic acid to obtain a wider range of applications. The composite material adopts polylactic acid as the main raw material and vegetable sponge short-fiber of organic modification, a small amount of lubricant and heat stabilizer are added. The invention has the advantages that: the fully biodegradable composite material which is prepared with the above raw material and the accessories has good mechanical property, excellent heat-resistant property, antisepsis, dampness-resistant and low cost, thus the composite material can be applied to the package-parcel, engineering construction, indoor decoration, automobile internal decoration and other fields, meanwhile the environmental problems brought by white pollution can also be resolved.

Description

technical field [0001] The invention relates to a fully biodegradable polylactic acid / loofah fiber composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a synthetic linear aliphatic polyester, which is a synthetic polymer that is completely biodegradable in nature. Its synthetic monomer lactic acid is widely derived from agricultural products, and the degradation products are water and carbon dioxide which are harmless to the environment. The material has good mechanical strength, thermoplasticity, fibrillation and transparency, and is suitable for a variety of processing methods. It is considered by the industry to be the most promising new material in the new century. However, pure polylactic acid itself is a linear polymer with high brittleness, low heat distortion temperature, poor impact resistance, low gas barrier and flame retardancy, and difficult to control the degradation cycle. These shortcomings limit the fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J5/06B29C51/00
Inventor 尹静波俞臻阳王尹杰鲁晓春颜世峰陈学思
Owner SHANGHAI UNIV
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