Preparation method of transparent waterproof plant nanometer fiber composite material

A technology of nanofibers and composite materials, applied in the direction of chemical instruments and methods, synthetic resin layered products, coatings, etc., can solve the problems of performance reduction, restriction, easy water absorption and damage, etc., achieve good mechanical properties, improve weather resistance, The effect of increasing scale

Inactive Publication Date: 2013-03-20
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofibrous films are completely bound by hydrogen bonds, and are easily damaged by water absorption in high-humidity environments, reducing performance, seriously restricting and affecting their service life and wide application.
Not only that, the thickness of these films is usually less than 0.2 mm, which will inevitably fail to give full play to the excellent mechanical properties of nanofibers, and also limit the development and utilization of their large-scale and large-diameter materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: A certain mass fraction of nanofiber suspension is mixed with deionized water at a mass ratio of 2:1, first stirred under high-speed stirring conditions for 0.5h, and then the above solution is fully dispersed under ultrasonic radiation for 0.5h, and the solution is It can be colorless and transparent.

[0021] Step 2: Filter the uniformly dispersed nanofibers in a pressurized (or vacuum) filtration system to form a colloidal wet film, where the pressurized pressure is 0.6MPa. The moisture content of the wet film is about 5-6 times the mass of the nanofibers.

[0022] Step 3: The wet film is freeze-dried, and the moisture content of the dried film is about 5-8%.

[0023] Step 4: Lamination and compounding of nanofiber dry film. After drying, the film is coated with thermosetting epoxy resin on both sides. The mass ratio of resin to film is 1:1. After pre-curing for 30 minutes, the lamination is cold-pressed and cured for 30 minutes, and then hot-pressed and cu...

Embodiment 2

[0025] Step 1: A certain mass fraction of nanofiber suspension is mixed with deionized water at a mass ratio of 2:1, first stirred under high-speed stirring conditions for 0.5h, and then the above solution is fully dispersed under ultrasonic radiation for 0.5h, and the solution is It can be colorless and transparent.

[0026] Step 2: Filter the uniformly dispersed nanofibers in a pressurized (or vacuum) filtration system to form a colloidal wet film, where the pressurized pressure is 0.6MPa. The moisture content of the wet film is about 5-6 times the mass of the nanofibers.

[0027] Step 3: The wet film is freeze-dried, and the moisture content of the dried film is about 5-8%.

[0028] Step 4: Lamination and compounding of nanofiber dry film. After drying, the film is coated with thermosetting epoxy resin on both sides. The mass ratio of resin to film is 2:3. After pre-curing for 30 minutes, the lamination is cold-pressed and cured for 30 minutes, and then hot-pressed and cu...

Embodiment 3

[0030] Step 1: A certain mass fraction of nanofiber suspension is mixed with deionized water at a mass ratio of 2:1, first stirred under high-speed stirring conditions for 0.5h, and then the above solution is fully dispersed under ultrasonic radiation for 0.5h, and the solution is It can be colorless and transparent.

[0031] Step 2: Filter the uniformly dispersed nanofibers in a pressurized (or vacuum) filtration system to form a colloidal wet film, where the pressurized pressure is 0.6MPa. The moisture content of the wet film is about 5-6 times the mass of the nanofibers.

[0032] Step 3: The wet film is freeze-dried, and the moisture content of the dried film is about 5-8%.

[0033] Step 4: Lamination and compounding of nanofiber dry film. After drying, the film is coated with thermosetting epoxy resin on both sides. The mass ratio of resin to film is 3:2. After pre-curing for 30 minutes, the lamination is cold-pressed and cured for 30 minutes, and then hot-pressed and cu...

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Abstract

The invention discloses a preparation method of a transparent waterproof plant nanometer fiber composite material. By the method, firstly water loss of a nanometer fiber suspension is used to form fiber films, hydrogen bonds of which are mutually bonded to be compact, and then single-layer films are laminated to obtain a high-strength light composite material of a target thickness by using a thermosetting epoxy resin. The laminated composite material prepared by the method disclosed by the invention is excellent in mechanical property, high in specific strength, good in weather fastness and thermal resistance, environment-friendly, and is a biomass nanometer composite material of great potential.

Description

technical field [0001] The invention relates to a plant fiber composite material and a preparation method thereof, in particular to a transparent water-resistant plant nanofiber composite material and a preparation method thereof. Background technique [0002] At present, with the advancement of social science, a new type of plant nanofiber has been born in forestry materials. This plant nanofiber uses high-speed mechanical shearing and impact, or combined with chemical pretreatment to separate plant fiber cellulose into diameters less than 100nm fine fibers. Compared with traditional fibers (diameters of micrometers and millimeters), this nanofiber has excellent mechanical properties, its elastic modulus is close to 150GPa, and its tensile strength exceeds 2GPa. At the same time, the surface of these elongated fibers is rich in hydroxyl groups and has a large aspect ratio, and can be uniformly dispersed in aqueous solution at room temperature, and the network is interwoven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J5/18C08L97/02B32B9/02B32B9/04B32B27/12B32B27/38
Inventor 卿彦吴义强蔡智勇张新荔李贤军李新功姚春花胡云楚
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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