Cellulose Fiber Composite Salt Structure for Transparent Resin Reinforcement
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Solution Overview
Problem
Existing fine cellulose fiber composites fail to simultaneously achieve sufficient transparency and mechanical strength when blended with plasticizers or thermoplastic/resin compositions, and often result in high aggregate amounts.
Innovation Solution
A fine cellulose fiber composite is developed with carboxy groups and an ethylene oxide/propylene oxide (EO/PO) copolymer moiety, where the fibers are bound with an amine to form a salt, enhancing dispersibility and affinity to resins, thereby improving mechanical strength and transparency while reducing aggregate formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fine cellulose fibers are blended with plasticizers or thermoplastic resins, then mechanical strength is improved, but transparency deteriorates and aggregate formation increases
Solution Approach 1:
The patent applies parameter changes by controlling the carboxyl group content within a specific range (0.03 to 3 mmol/g) and the average fiber diameter within (5 to 50 nm). These parameter optimizations enable the cellulose fibers to disperse uniformly in resin compositions without excessive aggregation, maintaining both mechanical strength enhancement and transparency. The specific parameter ranges are determined to balance fiber reinforcement effectiveness with optical clarity requirements.
Solution Approach 2:
The patent creates a composite material system by blending fine cellulose fibers with plasticizers or thermoplastic resins. The composite structure combines the high strength-to-weight ratio of cellulose fibers with the processability and optical properties of the resin matrix. This composite approach allows simultaneous achievement of improved mechanical strength and maintained transparency when proper fiber parameters are selected.
2Strength
If fine cellulose fibers are blended with thermoplastic resins, then mechanical strength is improved, but heat resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the carboxyl group content (0.03 to 3 mmol/g) and average fiber diameter (5 to 50 nm) to achieve uniform dispersion and strong interfacial adhesion between cellulose fibers and thermoplastic resin matrix. This enhanced adhesion prevents fiber-matrix debonding at elevated temperatures, thereby improving heat resistance while maintaining mechanical strength enhancement.
3Strength
If fine cellulose fibers are used in resin compositions, then mechanical strength is improved, but aggregate formation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the carboxyl group content within 0.03 to 3 mmol/g and average fiber diameter within 5 to 50 nm. These parameter optimizations ensure sufficient surface functionality for resin adhesion while preventing excessive fiber-fiber interactions that lead to aggregation. The controlled parameters enable uniform dispersion throughout the resin composition, maintaining both mechanical strength and compositional stability.
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of fine cellulose fibers throughout the resin composition. The optimized fiber parameters create consistent local interactions between fibers and resin matrix, preventing localized aggregation. This uniform local quality across the entire composite ensures homogeneous mechanical properties and prevents aggregate formation while maintaining strength enhancement.
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 achieves excellent transparency and mechanical strength when blended with plasticizers or thermoplastic/resins, with reduced aggregate amounts, and provides enhanced heat resistance and dimensional stability.
Implementation Method 1
fine cellulose fibers having a carboxy group and an amine having an ethylene oxide/propylene oxide (EO/PO) copolymer moiety, the fine cellulose fibers being bound with the amine at the carboxy group to form a salt
Data Source
AI summary
A fine cellulose fiber composite containing fine cellulose fibers having a carboxy group and an amine having an ethylene oxide/propylene oxide (EO/PO) copolymer moiety, the fine cellulose fibers being bound with the amine at the carboxy group to form a salt, wherein the fine cellulose fibers have a carboxy group content of 0.1 mmol/g or more, and wherein the molecular weight of the EO/PO copolymer moiety is from 700 to 10,000, and wherein a PO content ratio in the EO/PO copolymer moiety is from 1 to 70% by mol. The fine cellulose fiber composite of the present invention has high dispersibility in the resin and can exhibit an effect of increasing strength, so that the fine cellulose fiber composite is suitably as various fillers, and the like.