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A kind of preparation method of polylactic acid foam material reinforced by cellulose nanocrystal

A polylactic acid foaming and nanocrystalline technology, which is applied in the field of material preparation, can solve the problem that the mechanical properties of polylactic acid are not very strong, and achieve the effects of convenient green production, simple process and enhanced mechanical properties.

Active Publication Date: 2019-06-21
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no one has developed composite materials and preparation methods based on nanocrystalline cellulose.
However, the mechanical properties of polylactic acid are not very strong, but now many devices require materials with high mechanical properties

Method used

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  • A kind of preparation method of polylactic acid foam material reinforced by cellulose nanocrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Add cellulose nanocrystals and polylactic acid to the solvent chloroform (or acetone or dichloromethane) and stir evenly. After drying to remove the solvent, a cellulose nanocrystal / polylactic acid composite material is obtained. Then use the method of supercritical carbon dioxide foaming, place the cellulose nanocrystal / polylactic acid composite material in an autoclave at 0°C, and then feed high-purity carbon dioxide to make the pressure in the kettle reach 5MPa, and keep the temperature of the kettle at 0°C. After reacting for 24 hours, the cellulose nanocrystal / polylactic acid composite material was taken out and quickly placed in a water bath, and the foaming temperature was controlled at 50°C to 90°C. A polylactic acid foam material reinforced by cellulose nanocrystals was prepared.

[0015] The mass ratio of the above cellulose nanocrystals to polylactic acid is 1:0.01.

[0016] 2. A sample strip (30 mm×2 mm×1 mm) made of cellulose nanocrystal-reinforced poly...

Embodiment 2 to 6

[0018] 1. Using the same steps as in Example 1, by changing the mass ratio of cellulose nanocrystals and polylactic acid and adjusting the foaming temperature, the products of Examples 2 to 10 were respectively obtained.

[0019] 2. Inject the nanocomposite materials prepared in the above examples into the same standard spline (30mm×2 mm×1 mm) using a micro-injection molding machine.

[0020] It can be seen that the process of the present invention adopts any ratio of cellulose nanocrystals and polylactic acid to obtain nanocomposite materials.

[0021] The mass ratio of cellulose nanocrystals and polylactic acid is different, and the mechanical properties of the obtained splines can be used to prepare materials with different properties according to different needs of the market.

[0022] Three, the tensile strength of each embodiment product and cellulose nanocrystal, polylactic acid and Young's modulus test contrast:

[0023]

[0024] The feed mass ratio in the above ta...

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Abstract

A method for preparing a polylactic acid foam material reinforced by cellulose nanocrystals, which relates to the technical field of material preparation. The cellulose nanocrystals and polylactic acid are uniformly mixed in a solvent, and supercritical carbon dioxide is used for foaming to obtain cellulose nanocrystals reinforcement. Polylactic acid foam material. The invention is convenient for industrialized production, energy-saving and environment-friendly, simple to manufacture, and the obtained product takes the best of the two, and the mechanical properties of the polylactic acid are enhanced.

Description

technical field [0001] The invention relates to the technical field of material preparation. Background technique [0002] Native cellulose microfibrils contain crystalline and amorphous regions distributed randomly along their length. The cellulose chains in the crystalline region are tightly packed and stable in nature; while the amorphous region has a loose structure and is easily attacked by chemical reagents or enzymes. Therefore, under appropriate acid or enzymatic treatment conditions, the amorphous region in natural cellulose is removed and the crystalline region is retained, and cellulose nanocrystals (NCC) in powder, liquid or gel state can be obtained. [0003] Cellulose nanocrystals (NCC) have a rigid rod-like structure, generally with a diameter of 1 to 100 nm and a length of tens to hundreds of nanometers, which is the smallest physical structural unit of cellulose. NCC comes from a wide range of sources, mainly coniferous wood, broad-leaved wood, cotton, cot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08L67/04C08J9/12
CPCC08J9/122C08J2203/06C08J2203/08C08J2301/04C08J2467/04C08L1/04C08L2203/14C08L67/04
Inventor 吴德峰仇亚昕吕巧莲
Owner YANGZHOU UNIV