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Novel regenerated cellulose fiber-aerogel composite material and preparation method thereof

A technology of regenerated cellulose and composite materials, applied in the field of new regenerated cellulose fiber-aerogel composite materials and their preparation, can solve the problems of complex preparation process, low skeleton strength, low dielectric constant, etc., and achieve biological activity. Good compatibility with and good moisture absorption and moisturizing performance, the effect of reducing production cost

Active Publication Date: 2017-11-07
利津慈母坊纺织科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aerogels are divided into three categories according to their components: inorganic aerogels, organic aerogels and composite aerogels, all of which have large specific surface area, low density, low thermal conductivity, low refractive index, Low dielectric constant and other characteristics have great application value in many fields such as heat insulation, sound insulation, hydrogen storage, catalysis, etc. Its high preparation cost such as supercritical drying limits the practical application of aerogels, so it is necessary to improve the mechanical properties of aerogels and reduce production costs
[0004] At present, the preparation of airgel composite materials with fibers as reinforcements is an effective method to improve the mechanical properties of airgel. Method and application, the bonding points of metal fibers are sintered together to form a three-dimensional network structure, nano-carbon fibers are grown on metal fibers, carbon airgel is coated with nano-fibers, and the prepared material can be used as an electrode material. The material is basically Carbon materials are used as raw materials to prepare, the cost is high, the preparation process is relatively complicated, and the scope of use is relatively limited

Method used

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  • Novel regenerated cellulose fiber-aerogel composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) In parts by weight, add 5 parts of regenerated or residual cellulose produced and processed into 80 parts of ionic liquid, heat and stir at 70° C. for 6 hours until the cellulose is completely dissolved, and obtain a cellulose mixed solution.

[0028] (2) In the mold, pave 5 μm regenerated cellulose fibers into regular 50 orthogonal fiber layers, add the cellulose mixed solution prepared in step (1) until the solution covers the surface of all regenerated cellulose fibers, and obtain Primary composite template, wherein the mass fraction of regenerated cellulose fibers is 50%.

[0029] (3) Place the primary composite template prepared in step (2) in a sub-zero environment of -4°C for 4 hours to freeze-dry, then replace the ionic liquid, and finally freeze-dry for 2 hours to obtain the regenerated cellulose fiber-aerogel of composite materials.

Embodiment 2

[0031] (1) In parts by weight, add 17 parts of regenerated or residual cellulose produced and processed into 100 parts of ionic liquid, heat and stir at 75° C. for 2 hours until the cellulose is completely dissolved, and obtain a cellulose mixed solution.

[0032] (2) In the mold, lay 7 μm regenerated cellulose fibers into regular 35 layers of oblique fiber layers, add the cellulose mixed solution prepared in step (1), until the solution covers the surface of all regenerated cellulose fibers, and obtain Primary composite template, wherein the mass fraction of regenerated cellulose fibers is 75%.

[0033] (3) Place the primary composite template prepared in step (2) in a sub-zero environment of -20°C for 2 hours to freeze-dry, then replace the ionic liquid, and finally freeze-dry for 2 hours to obtain the regenerated cellulose fiber-aerogel of composite materials.

Embodiment 3

[0035] (1) In parts by weight, add 15 parts of regenerated or residual cellulose produced and processed into 95 parts of ionic liquid, heat and stir at 70° C. for 4 hours until the cellulose is completely dissolved, and obtain a cellulose mixed solution.

[0036] (2) In the mould, spread 5 μm regenerated cellulose fibers into irregular 1 cm thick non-woven fabric form, add the cellulose mixed solution prepared in step (1) until the solution covers the surface of all regenerated cellulose fibers, and obtain Primary composite template, wherein the mass fraction of regenerated cellulose fibers is 75%.

[0037] (3) Place the primary composite material template prepared in step (2) in a sub-zero environment of -20°C for 3 hours to freeze-dry, then replace the ionic liquid, and finally freeze-dry for 4 hours to obtain the regenerated cellulose fiber-aerogel of composite materials.

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Abstract

The invention provides a novel regenerated cellulose fiber and aerogel composite material. The material comprises regenerated cellulose fibers and fiber-based aerogel, wherein the regenerated cellulose fibers are used as a skeleton, and the fiber-based aerogel is adsorbed on the surfaces of the regenerated cellulose fibers. Specifically, a preparation method includes the following operating steps: adding 5-17 parts by weight of cellulose into 80-110 parts by weight of ionic liquid, heating and stirring until cellulose is completely dissolved to obtain a cellulose mixed solution; then, spreading the regenerated cellulose fibers into a regular or irregular shape in a mold, adding the cellulose mixed solution until the solution covers the surfaces of all regenerated cellulose fibers to obtain a primary composite material template; finally, placing the primary composite material template in an environment below zero for freeze-drying, swapping out the ionic liquid, and freeze-drying again to obtain the regenerated cellulose fiber and aerogel composite material.

Description

Technical field: [0001] The invention belongs to the technical field of textile materials, and in particular relates to a novel regenerated cellulose fiber-aerogel composite material and a preparation method thereof. Background technique: [0002] Airgel, also known as solid smoke and frozen smoke, is the lightest solid material known so far. It is a solid amorphous substance with micro-nano porous network formed by the mutual aggregation of colloidal particles or polymer molecules. The gas replaces the liquid in the gel without changing the three-dimensional network microstructure of the gel itself, which has the characteristics of nano-porous structure and high porosity. [0003] Aerogels are divided into three categories according to their components: inorganic aerogels, organic aerogels and composite aerogels, all of which have large specific surface area, low density, low thermal conductivity, low refractive index, Low dielectric constant and other characteristics have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B30/02
Inventor 崔宸玮
Owner 利津慈母坊纺织科技有限公司