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Cellulose/polylactic acid blend material and preparation method thereof

A cellulose and polylactic acid technology, which is applied in the field of preparation of cellulose/polylactic acid blend materials, can solve the problem that the performance of polylactic acid/cellulose composite materials is unstable, the performance of blend materials is difficult to meet the requirements for use, and polylactic acid is difficult to meet. Problems such as poor material processing performance, to achieve the effect of low cost, simple molding method and high mechanical strength

Inactive Publication Date: 2014-04-09
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these natural fibers contain more lignin, hemicellulose, inorganic salts, waxes, etc., resulting in unstable performance of PLA / cellulose composites.
Polylactic acid / cellulose composite materials are mainly prepared by melt blending and hot pressing, but the addition of cellulose leads to poor processability of polylactic acid materials, uneven mixing of cellulose in polylactic acid, and defects in the interface And other problems, resulting in the performance of the blend material is difficult to meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1 part of cellulose prepared from wheat straw to 10 parts of NMMO aqueous solution with a concentration of 87%, raise the temperature to 90°C and dissolve for 30 hours until the cellulose is completely dissolved, then add 5 parts of cellulose with a relative number average molecular mass of 80,000 Poly L-lactic acid (PLLA), continue to stir until PLLA and cellulose are completely dissolved to obtain a blend. The blend was scraped on a constant temperature glass plate to form a film, and then the blend film and the glass plate were quickly immersed in a methanol coagulation bath for 1 hour, and then the film was immersed in a water bath for 15 hours to wash away the residual NMMO. The resulting blend film was vacuum-dried at 50° C. for 10 hours to obtain a wheat straw cellulose / poly-L-lactic acid blend material.

Embodiment 2

[0022] Add 10 parts of wheat straw cellulose (WSF) prepared from wheat straw fiber pulp to 50 parts of 90% NMMO aqueous solution, heat up to 90°C under stirring and swell for 15 hours, then heat up to 100°C, and then add 1 part For poly-L-lactic acid (PLLA) with a relative number-average molecular mass of 30,000, continue stirring until PLLA and cellulose are completely dissolved to obtain a PLLA / WSF blend. The PLLA / WSF blend was extruded, and the extrudate was quickly immersed in a methanol coagulation bath for 0.11 hours, and then immersed in a water bath for 48 hours to wash away the residual NMMO. The resulting blend was vacuum-dried at 100° C. for 10 hours to obtain a wheat straw cellulose / polylactic acid blend material.

Embodiment 3

[0024] Add 1 part of mulberry cellulose powder prepared from mulberry branches into 8 concentration of 30% NMMO aqueous solution, heat up to 50 °C under stirring, swell at constant temperature for 24 hours, then heat up to 90-100 °C, and then add 1 part of relative Poly D,L-lactic acid (PDLLA) with a number average molecular mass of 100,000, and continue to stir until the PDLLA and cellulose are completely dissolved to obtain a blend. The blend solution was scraped on a constant temperature hot glass plate to form a film, and then the blend film and the glass plate were quickly immersed in a mixed coagulation bath of methanol and water (the molar ratio of methanol to water was 1: 1), soaked for 48 Hours later, to wash away residual NMMO. The resulting blend was vacuum dried at 100° C. for 10 hours to obtain a cellulose / polylactic acid blend material.

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PUM

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Abstract

The invention discloses a blend material of cellulose and a polylactic acid. The blend contains 0.1-99.9% of cellulose and 99.9-0.1% of polylactic acid. The method comprises the following steps: with a 30-100% N-methylmorpholine-N-oxide (NMNO) water solution as a solvent, adding cellulose and a polylactic acid to the NMMO solution; dissolving at constant temperature of 35-150 DEG C for 0.1-100 hours; completely dissolving the cellulose and the polylactic acid, so as to prepare the mixed solution of the cellulose and the polylactic acid; precipitating a molding product of the mixed solution by a precipitant; and pelletizing and drying the obtained blend in vacuum, so as to prepare the blend material of the cellulose and the polylactic acid. The raw material of the cellulose is any one or a mixture of more than two of straws, bagasse, wood fiber, jute fiber, beet pulp, bamboo fiber, cotton pulp, hemp pulp, bamboo pulp and recycled cellulose, and the polylactic acid is a homopolymer, a copolymer or a blend thereof.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation method of a cellulose / polylactic acid blend material. Background technique [0002] Cellulose is an abundant and renewable natural polymer material. The main components of woody and herbaceous plants are cellulose, lignin and hemicellulose, among which the content of cellulose in herbaceous plants is about 10%-25%, that of wood is about 40%-53%, and that of flax bast is about 60%. %-85%, while the cellulose content of cotton is as high as 90%. Plants produce up to 100 billion tons of cellulose through photosynthesis every year, and cellulose is an inexhaustible renewable resource. With the decrease of petroleum reserves, the soaring price of petrochemical raw materials, and the increasing attention and attention to environmental pollution in all countries in the world, cellulose-based renewable resources are increasingly concerned in the field of materials, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08L67/04
Inventor 高勤卫蒋丽丁亮徐晨洪建国
Owner NANJING FORESTRY UNIV
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