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Hyperelastic three-dimensional (3D) printing nano-crystalline cellulose composite material and preparation method thereof

A nanocellulose and 3D printing technology, applied in the field of 3D printing materials, can solve the problems of high cost, environmental protection and sustainable development, and achieve cost saving, high elasticity, excellent anti-fatigue compression performance, and broad application prospects

Active Publication Date: 2020-07-28
RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is costly and does not meet the requirements of environmental protection and sustainable development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a method for preparing a superelastic 3D printed nanocellulose composite material, the steps are as follows:

[0030] Step 1) prepare 100 grams of microcrystalline nanocellulose solution of 6wt% mass fraction;

[0031] Step 2) add TiO in the prepared microcrystalline nanocellulose aqueous solution 2 6 grams of nanoparticles, homogenized by a high-speed homogenizer;

[0032] Step 3) It is directly used for 3D printing at room temperature, the printing speed is 2.5mm / s, the material extrusion speed is 1.5mL / h, and the nozzle diameter is 0.41mm;

[0033] Step 4) A calcium chloride solution with a concentration of 0.5 mol / L was added dropwise to the formed sample for 5 minutes, and after the sample was taken out, it was freeze-dried with liquid nitrogen and placed in a 40% humidity environment.

[0034] Nanocellulose / TiO prepared by Example 1 2 The nanoparticle composite 3D printing sample was subjected to 24 times of 50% deformation compression ...

Embodiment 2

[0036] This embodiment provides a method for preparing a superelastic 3D printed nanocellulose material, the steps are as follows:

[0037] Step 1) Dehydrate the nanocellulose aqueous solution prepared by TEMPO oxidation to a concentration of 2.0 wt% by vacuum drying, and take 100 grams;

[0038] Step 2) Add 18 grams of nano-montmorillonite in the dehydrated nano-cellulose aqueous solution, and adopt a high-speed homogenizer to homogenize;

[0039] Step 3) It is directly used for 3D printing at room temperature, the printing speed is 2.5mm / s, the material extrusion speed is 1.5mL / h, and the nozzle diameter is 0.41mm;

[0040] Step 4) Add a calcium chloride solution with a concentration of 0.75 mol / L dropwise on the shaped sample for 30 minutes, take out the sample and freeze-dry it with liquid nitrogen, and place it in a 40% humidity environment.

experiment example 1

[0044] The mechanical compression test was carried out on the composite materials in the above Example 2 and Comparative Example 1. When the compression set was 50%, the sample of Example 2 recovered 100% of the deformation, and the sample of Comparative Example 1 was close to 40% of the compression set. It can be seen that , Low concentrations of hygroscopic salts cannot make materials resilient.

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PUM

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Abstract

The invention relates to a hyperelastic three-dimensional (3D) printing nano-crystalline cellulose composite material and a preparation method thereof. The preparation method comprises the following steps of mixing a nano-crystalline cellulose water solution with the concentration ranging from 1.5 to 12 percent by weight and inorganic nano-particles, carrying out 3D printing forming after homogenization treatment, steeping printing hydrogel with hygroscopic salt, freeze drying for forming, and obtaining the hyperelastic 3D printing nano-crystalline cellulose composite material. The antifatiguehyperelastic 3D composite material provided by the invention has a broad application prospect in the aspects such as substance adsorption, water collection and bioengineering.

Description

technical field [0001] The invention relates to the technical field of 3D printing materials, in particular to a superelastic 3D printing nano-cellulose composite material and a preparation method thereof. Background technique [0002] Cellulose widely exists in plants and their processed products, marine organisms and bacteria. Due to its unique small size effect, high specific surface area, high Young's modulus, high mechanical strength, and high biocompatibility, nanocellulose is significantly different from macroscopic objects in terms of physical, chemical, and mechanical properties. Nanocellulose also has a good fluffy three-dimensional network structure, which can promote the mechanical combination of polymer matrix and nanocellulose, and enhance the performance of matrix materials. Therefore, the use of nanocellulose as the main material or filling material is in line with the development trend of high-performance green composite materials. [0003] Nanocellulose / i...

Claims

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Application Information

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IPC IPC(8): B29C64/106B29C64/379B29C71/00C08L1/04C08K3/22C08K3/34B33Y10/00B33Y40/20B33Y70/10
CPCB29C64/106B29C64/379B29C71/0009C08K3/22C08K3/346B33Y10/00B33Y40/00B33Y70/00B29C2071/0027C08K2003/2241C08K2201/011C08L1/04
Inventor 陈媛姜峰李改云
Owner RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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