Nanofiber sheet, process for producing the same, and fiber-reinforced composite material

A technology of nanofibers and manufacturing methods, applied in the field of nanofiber non-woven fabrics and its manufacturing, can solve the problem of simultaneously achieving high transparency, low linear thermal expansion coefficient, high Young's modulus, and linear thermal expansion coefficient of fiber-reinforced composite materials Large size, poor heat resistance of nanofibers, etc., to achieve high strength, excellent heat resistance, and low specific gravity
CN101535567AActive Publication Date: 2009-09-16MITSUBISHI RAYON CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI RAYON CO LTD
Publication Date
2009-09-16

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Abstract

Provided is a nanofiber sheet that sufficiently refined by fibrillation and has high crystallinity of cellulose fiber and can realize a fiber-reinforced composite material exhibiting high transparency, a high elastic modulus, a low coefficient of linear thermal expansion, and high heat resistance and being high in flatness and smoothness. This nanofiber sheet includes crystalline cellulose as the main component and a lignin in an amount of from 10 ppm to 10 wt%. When a fiber / resin composite material obtained by impregnating the nanofiber sheet with tricyclodecane dimethacrylate, subjecting the impregnated product to UV-curing at 20 J / cm 2 , and heating the cured product in vacuum at 160 DEG C for two hours includes 60 wt% of the cured tricyclodecane dimethacrylate and 40 wt% of nanofiber, the following physical characteristics (i) to (iii) are satisfied: (i) the parallel light transmittance of light of a wavelength of 600 nm at a sheet thickness of 100 [mu]m is 70% or more; (ii) the Young's modulus is 5.0 GPa or more; and (iii) the coefficient of linear thermal expansion is 20 ppm / K or less.
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Description

technical field

[0001] The present invention relates to a nonwoven fabric of nanofibers (hereinafter referred to as "nanofiber sheet") and a method for producing the same.

[0002] The present invention also relates to a fiber-reinforced composite material obtained by impregnating the nanofiber sheet with a matrix material. Background technique

[0003] As the most common fiber-reinforced composite material, a glass fiber-reinforced resin obtained by impregnating glass fibers with a resin is known. Such glass fiber-reinforced resins are generally opaque materials, but Patent Document 1 and Patent Document 2 below disclose a method for obtaining a transparent glass fiber-reinforced resin by matching the refractive index of glass fibers with that of a matrix resin.

[0004] However, low thermal expansion, high strength, high elasticity, light weight, etc. are required for transparent flexible substrates for mounting LEDs, organic electronic devices. However, although glass f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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