A kind of method for plasticizing biomass composite material with low melting point chitosan microspheres

A technology for chitosan microspheres and biomass materials, which is applied in the field of polymer material preparation, can solve the problems of being difficult to dissolve, difficult to process and form, and achieve the effects of avoiding degradation, improving mechanical properties, and avoiding poor mechanical properties.

Active Publication Date: 2020-10-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although pure biomass materials (cellulose, lignin, hemicellulose, etc.) are environmentally friendly, they are difficult to process due to their insoluble properties in any solvent or melting properties

Method used

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  • A kind of method for plasticizing biomass composite material with low melting point chitosan microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Prepare materials, prepare chitosan, concentrated hydrochloric acid, sodium bicarbonate and sodium lauryl sulfate;

[0027] (2) To prepare chitosan solution, first dilute concentrated hydrochloric acid to 1% dilute hydrochloric acid solution, add an appropriate amount of chitosan powder, mechanically stir to obtain chitosan solution, the rotating speed is 500r / min, and stir for 1 hour;

[0028] (3) To prepare chitosan microspheres, first add a small amount of sodium lauryl sulfate powder into the sodium bicarbonate solution to obtain a mixed solution; then drop the chitosan solution into the above-mentioned sodium bicarbonate mixed solution, and use Mechanical stirring, obtains the chitosan microsphere that separates out;

[0029] (4) Ultrasonic dispersion is carried out to the mixed solution containing chitosan microspheres to further refine the particle size, the ultrasonic time is preferably 30min, and the ultrasonic power is preferably 300W, and then the solutio...

Embodiment 2

[0032] (1) prepare materials, prepare chitosan, acetic acid, sodium bicarbonate and sodium lauryl sulfate;

[0033] (2) To prepare chitosan solution, first dilute acetic acid to 1% acetic acid solution, add an appropriate amount of chitosan powder, mechanically stir to obtain chitosan solution, the rotating speed is 300r / min, and stir for 2 hours;

[0034] (3) To prepare chitosan microspheres, first add a small amount of sodium lauryl sulfate powder into the sodium bicarbonate solution to obtain a mixed solution; then drop the chitosan solution into the above-mentioned sodium bicarbonate mixed solution, and use Mechanical stirring, obtains the chitosan microsphere that separates out;

[0035] (4) Ultrasonic dispersion is carried out to the mixed solution containing chitosan microspheres to further refine the particle size, the ultrasonic time is preferably 30min, and the ultrasonic power is preferably 300W, and then the solution freeze-drying after the ultrasonic wave is obtai...

Embodiment 3

[0038] (1) prepare materials, prepare chitosan, formic acid, sodium bicarbonate and sodium lauryl sulfate;

[0039] (2) To prepare chitosan solution, at first dilute formic acid to 1% formic acid solution, add an appropriate amount of chitosan powder, mechanically stir to obtain chitosan solution, the rotating speed is 300r / min, stir for 2 hours;

[0040] (3) To prepare chitosan microspheres, first add a small amount of sodium lauryl sulfate powder into the sodium bicarbonate solution to obtain a mixed solution; then drop the chitosan solution into the above-mentioned sodium bicarbonate mixed solution, and use Mechanical stirring, obtains the chitosan microsphere that separates out;

[0041] (4) Ultrasonic dispersion is carried out to the mixed solution containing chitosan microspheres to further refine the particle size, the ultrasonic time is preferably 30min, and the ultrasonic power is preferably 300W, and then the solution freeze-drying after the ultrasonic wave is obtain...

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Abstract

The invention belongs to the field of polymer material preparation, and discloses a preparation method of a low-melting-point chitosan microsphere plasticized biomass composite material. The method comprises the following steps: (a) selecting an acidic solution to dissolve chitosan powder to form a chitosan solution, adding an alkaline solution into the chitosan solution to form a mixed solution,adjusting the pH value of the mixed solution to be 7 or above, and stirring the mixed solution until nano-scale chitosan spherical particles are separated out; and (b) mixing the nano-scale chitosan spherical particles with a biomass material, so that the chitosan is coated on the surface of the biomass material to form a biomass composite material, wherein the phenomenon that the biomass materialis agglomerated and is not melted during melt processing is avoided by the small-size effect of the nano-scale chitosan spherical particles. According to the method, the chitosan particles are nanocrystallized, the melting point of the chitosan particles is reduced, agglomeration of the chitosan biomass composite material during melt processing is avoided, and the mechanical property of the chitosan biomass composite material is improved.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and more specifically relates to a method for plasticizing biomass composite materials with low melting point chitosan microspheres. Background technique [0002] Chitin is the second most important natural polymer in the world, and chitosan is one of its important derivatives, which has special properties such as richness, biodegradability, biocompatibility, and non-toxicity. Chitosan-based materials have been used to prepare hydrogels, films, fibers or sponges, which are widely used in biomedical fields. However, the melting point of chitosan is close to the degradation temperature, making it difficult to melt process. The invention utilizes the surface effect and small size effect of nanometer materials to prepare chitosan microspheres to reduce the melting temperature of chitosan. At present, the environmental pollution caused by plastics has become an urgent problem to be solved...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08L1/02C08L97/00C08L5/14
Inventor 王云明张云周华民黄志高李德群孙双余兆函
Owner HUAZHONG UNIV OF SCI & TECH
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