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Highly heat-resistant resin composite including chemically modified, fine cellulose fibers

A chemical modification, microfiber technology, applied in the direction of synthetic cellulose fibers, post-treatment modification of cellulose pulp, paper, etc., can solve the problems of mechanical properties, insufficient dimensional stability, high specific gravity of resin composition, and weight of resin moldings. increase, etc.

Active Publication Date: 2021-01-08
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resins alone often have insufficient mechanical properties, dimensional stability, etc., and composites of resins and various inorganic materials are usually used
[0003] The resin composition obtained by reinforcing the resin with glass fiber, carbon fiber, talc, clay, etc. as a reinforcing material of the inorganic filler has a high specific gravity, so there is a problem that the weight of the obtained resin molded product increases

Method used

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  • Highly heat-resistant resin composite including chemically modified, fine cellulose fibers
  • Highly heat-resistant resin composite including chemically modified, fine cellulose fibers
  • Highly heat-resistant resin composite including chemically modified, fine cellulose fibers

Examples

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no. 1 Embodiment approach

[0092] The 1st embodiment which is one form of this invention provides a kind of resin composite which contains thermal decomposition initiation temperature (T D ) is a chemically modified cellulose fine fiber having a temperature of 270° C. or higher and a number average fiber diameter of 10 nm or more and less than 1 μm. In one aspect, the resin composite contains 0.5 to 40% by mass of chemically modified cellulose fine fibers. In one embodiment, the crystallinity of the chemically modified cellulose fine fibers is 60% or more.

[0093] "Chemically modified cellulose fine fibers" (may also be referred to as "chemically modified fine fibers" in the present invention) refer to cellulose fine fibers in which at least a part of the hydroxyl groups in the cellulose skeleton has been modified. In a typical embodiment, the entire cellulose is not chemically modified, and the chemically modified fine fibers maintain the crystal structure of the cellulose fine fibers before chemical...

no. 2 Embodiment approach

[0271] A second embodiment that is one aspect of the present invention provides a chemically modified polycarbonate compound having a weight average molecular weight (Mw) of 100,000 or more and a ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of 6 or less. Cellulose microfibers. As described above about the first embodiment, since the ends of the cellulose molecules are the starting points of thermal decomposition, by increasing the weight average molecular weight and narrowing the width of the molecular weight distribution, cellulose with high heat resistance can be obtained. A fine fiber and a resin composite of the cellulose fine fiber and a resin.

[0272] In one aspect, the chemically modified fine fibers of the second embodiment have an alkali-soluble component content of 12% by mass or less.

[0273] In one aspect, the chemically modified fine fiber of the second embodiment has a thermal decomposition initiation te...

no. 3 Embodiment approach

[0280]A third embodiment that is one aspect of the present invention provides a resin composite comprising 0.5 to 40% by mass of chemically modified cellulose fine fibers and a resin, wherein the chemically modified fibers The DS unevenness ratio (DSs / DSt) of the plain fine fiber is 1.1 or more, and the variation coefficient (CV) of the DS unevenness ratio (DSs / DSt) is 50% or less. The DS unevenness ratio (DSs / DSt) is the fiber surface layer The ratio of the degree of modification (DSs) to the degree of modification (DSt) of the fiber as a whole.

[0281] The third embodiment also provides a method for producing a resin composite comprising 0.5 to 40% by mass of chemically modified cellulose fine fibers and a resin, which includes the following steps:

[0282] The fiber opening step is to open the cellulose raw material in a dispersion liquid containing the cellulose raw material and an aprotic solvent and substantially not containing ionic liquid and sulfuric acid to obtain c...

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Abstract

Provided is a resin composite having high mechanical properties which make the resin composite moldable into and usable as members for use in applications such as vehicle-mounted members and electrical materials. The resin composite comprises 0.5-40 mass% chemically modified, fine cellulose fibers and a resin, wherein the chemically modified, fine cellulose fibers have a pyrolysis initiation temperature (TD) of 270 DEG C or higher, a number-average fiber diameter of 10 nm or larger but less than 1 micron, and a degree of crystallinity of 60% or higher. In a preferred embodiment, the chemicallymodified, fine cellulose fibers have a coefficient of variation (CV) in DS unevenness ratio, DSs / DSt, of 50% or less, the DS unevenness ratio being the ratio of the modification degree (DSs) of the surface layers of the fibers to the modification degree (DSt) of the whole of the fibers.

Description

technical field [0001] The present invention relates to a resin composite comprising chemically modified cellulose fine fibers and having a high thermal decomposition initiation temperature. Background technique [0002] Thermoplastic resins are light in weight and have excellent processing characteristics, so they are widely used in various fields such as automobile parts, electric-electronic parts, office equipment casings, and precision parts. However, resins alone are often insufficient in mechanical properties, dimensional stability, etc., and composites of resins and various inorganic materials are generally used. [0003] A resin composition obtained by reinforcing a resin with glass fiber, carbon fiber, talc, clay, etc. as a reinforcing material for an inorganic filler has a high specific gravity, and thus has a problem of increasing the weight of the obtained resin molded article. [0004] In recent years, cellulose fine fibers (hereinafter also referred to as cell...

Claims

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Application Information

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IPC IPC(8): C08L1/10C08J5/06C08L101/00D21H11/18D21H13/02
CPCD21H11/18C08L1/10D21H11/20C08L1/08C08B3/20C08B3/06C08J5/06C08J2377/06C08J2401/10C08L77/06
Inventor 小野博文河原一文小泽亮介大贺正广
Owner ASAHI KASEI KK
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