Surface-Treated Nanocellulose Master Batch for Uniform Rubber Dispersion
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Solution Overview
Problem
Existing rubber compositions face challenges in uniformly dispersing nanocellulose, leading to difficulties in achieving desired characteristics such as excellent elongation, hardness, water resistance, and resistance against breakage.
Innovation Solution
A surface-treated nanocellulose master batch containing a rubber component, nanocellulose, resole or novolac resorcin-formaldehyde initial condensation product, and formaldehyde, with specific mass ratios, ensures uniform dispersion and enhances mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nanocellulose is blended into rubber composition to improve elastic modulus and hardness, then mechanical properties are enhanced, but nanocellulose easily aggregates and bundles during moisture removal, making it difficult to maintain uniform nanometer-scale dispersion
Solution Approach 1:
The patent applies preliminary action by surface-treating nanocellulose with silane coupling agents and other modifiers before blending it into the rubber composition. This pre-treatment creates a protective surface layer that prevents aggregation during subsequent processing steps including moisture removal, thereby maintaining uniform nanometer-scale dispersion while achieving the desired mechanical property enhancements
Solution Approach 2:
The patent introduces intermediary substances including silane coupling agents, surfactants, and compatibilizers that act as mediators between nanocellulose and rubber matrix. These intermediaries reduce surface energy and improve interfacial compatibility, preventing nanocellulose aggregation during processing while ensuring uniform dispersion in the final composite
2Ease of manufacture
If chemically modified microfibril cellulose with cationic groups is used to improve processability and mechanical properties, then rigidity and fracture characteristics are enhanced, but nanocellulose aggregation during moisture removal remains a critical issue
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of chemical modification, molecular weight, and surface charge density of the nanocellulose. By optimizing these parameters and using multi-component modification systems, the patent achieves improved processability while maintaining stable dispersion during moisture removal through balanced electrostatic and steric stabilization
3Strength
If nanocellulose is dispersed in rubber composition to achieve excellent characteristics, then elastic modulus and hardness improve, but water resistance and resistance against breakage are insufficient
Solution Approach 1:
The patent applies composite materials principle by creating a multi-component system that combines nanocellulose with rubber matrix and various functional additives including crosslinking agents, antioxidants, and water-resistant modifiers. This composite structure provides synergistic effects where the nanocellulose reinforcement is protected by surface treatments and crosslinked networks, simultaneously achieving improved mechanical properties, water resistance, and breakage resistance
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 solution results in a rubber composition with uniformly dispersed nanocellulose, maintaining elongation and hardness, and improving resistance against breakage and water resistance.
Implementation Method 1
a surface-treated nanocellulose master batch containing a rubber component, nanocellulose, a resole and/or novolac resorcin-formaldehyde initial condensation product, and formaldehyde
Data Source
AI summary
A surface-treated nanocellulose master batch includes a rubber component, a nanocellulose, a resole or novolac resorcin-formaldehyde initial condensation product, and formaldehyde. The the surface-treated nanocellulose master batch includes from 0.3 to 15 parts by mass of the nanocellulose per 100 parts by mass of the rubber component. The the surface-treated nanocellulose master batch includes from 0.03 to 1.2 parts by mass of the resole or novolac resorcin-formaldehyde initial condensation product per 1 part by mass of the nanocellulose and 0.02 to 0.8 parts by mass of the formaldehyde per 1 part by mass of the nanocellulose.