Cellulose fiber composite
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Solution Overview
Problem
Cellulose fibers aggregate easily due to hydrogen bonding when dried, leading to poor dispersibility in mediums and resins, and there is a need for improved dispersion stability, viscosity increase, and transparency when blended with resins.
Innovation Solution
A cellulose fiber composite is created by bonding at least one amine, selected from a polyamine or monoamine with a reactive functional group, to anion-modified cellulose fibers, with a controlled amine introduction ratio of 60% or less and an average polymerization degree of 300 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cellulose fibers are dried, then mechanical strength is improved, but dispersibility in medium deteriorates due to hydrogen bond aggregation
Solution Approach 1:
The patent applies preliminary action by introducing anionic groups (such as carboxyl groups) into the cellulose fibers before the drying process. This pre-modification ensures that even when fibers aggregate through hydrogen bonding during drying, the anionic groups remain available to interact with cationic surfactants later, preventing permanent aggregation and maintaining dispersibility in the final medium.
Solution Approach 2:
The patent uses cationic surfactants as intermediaries to mediate between the anion-modified cellulose fibers and the dispersion medium. The cationic surfactants interact with the anionic groups on the fiber surfaces through electrostatic attraction, forming a protective layer that prevents fiber aggregation and enhances dispersibility without compromising the mechanical strength gained from drying.
2Strength
If cellulose fibers are blended in hydrophobic resin, then mechanical reinforcement is achieved, but dispersibility deteriorates due to hydrophilic surface aggregation
Solution Approach 1:
The patent applies parameter changes by modifying the surface charge parameter of cellulose fibers through anionic group introduction. This chemical modification changes the interaction parameters between fibers and hydrophobic resin, allowing the hydrophilic fibers to disperse uniformly in hydrophobic environments when combined with cationic surfactants, thereby achieving both mechanical reinforcement and good dispersibility.
Solution Approach 2:
The patent creates a composite structure by combining anion-modified cellulose fibers with cationic surfactants. This composite approach allows the hydrophilic cellulose fibers to be compatible with hydrophobic resins through the intermediary cationic surfactant layer, enabling effective dispersion and mechanical reinforcement simultaneously.
3Adaptability or versatility
If amine introduction ratio is increased, then compatibility with resin is improved, but viscosity increase performance deteriorates when exceeding 60%
Solution Approach 1:
The patent applies partial action by introducing amines at a controlled ratio (optimal range identified as 30-60%, with 60% as the upper limit). This partial modification provides sufficient compatibility with resins for practical applications while avoiding excessive amine introduction that would cause over-crosslinking and loss of viscosity increase performance. The patent identifies and exploits this optimal partial modification range to balance both requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite exhibits enhanced dispersion stability, viscosity increase, and transparency, resulting in improved mechanical strength and compatibility with resins, suitable for applications like coatings and inks.
Implementation Method 1
at least one amine selected from a polyamine and a monoamine having a reactive functional group bonds to anion-modified cellulose fibers
Implementation Method 2
when cellulose fibers are dried, enormous hydrogen bonds are formed between the fibers, thereby aggregating the cellulose fibers
Data Source
AI summary
The invention relates to [1] a cellulose fiber composite excellent in dispersion stability, in which at least one amine selected from a polyamine and a monoamine having a reactive functional group bonds to anion-modified cellulose fibers, and which satisfies at least one of amine introduction ratio of 60% or less (requirement 1) and average polymerization degree of anion-modified cellulose fibers of 300 or less (requirement 2), [2] a dispersion in which the cellulose fiber composite is dispersed in a medium, [3] a resin composition produced by blending the cellulose fiber composite and a resin, [4] a molded article produced by molding the cellulose fiber composite or the resin composition, and [5] a method for producing the cellulose fiber composite.