Nanoparticle-Loaded Cellulose Dispersion for Stable Paper Coatings
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Solution Overview
Problem
Nanoparticle dispersions are unstable, prone to aggregation, and hazardous due to dusting and skin absorption, posing handling challenges during paper and board production.
Innovation Solution
A process involving mechanical disintegration of pre-treated cellulose fibers and nanoparticles in a pressure homogenizer to produce a stable dispersion where nanoparticles are absorbed onto or into microfibrillated cellulose, reducing free nanoparticles and enhancing dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanoparticles are added to dispersions or slurries, then the reactive properties are improved, but the dispersion stability deteriorates and nanoparticles form aggregates
Solution Approach 1:
The patent uses microfibrillated cellulose as an intermediary substance that absorbs nanoparticles, preventing direct nanoparticle-nanoparticle contact that leads to aggregation. The cellulose acts as a mediator maintaining nanoparticle dispersion stability while preserving reactivity.
Solution Approach 2:
The invention creates a composite material system where nanoparticles are integrated with microfibrillated cellulose matrix. This composite structure combines the reactive properties of nanoparticles with the stabilizing properties of cellulose, resolving the contradiction between reactivity and stability.
2Reliability
If nanoparticles are used in dispersions, then functional properties are enhanced, but dusting problems increase and handling becomes hazardous
Solution Approach 1:
Microfibrillated cellulose serves as a protective intermediary that binds nanoparticles, preventing them from becoming airborne as dust or being absorbed through skin. The cellulose matrix encapsulates nanoparticles, eliminating harmful effects while preserving functional properties.
Solution Approach 2:
The microfibrillated cellulose forms a flexible matrix or shell around nanoparticles, creating a physical barrier that prevents dusting and skin contact. This thin film structure maintains nanoparticle functionality while protecting against harmful exposure.
3Stability of the object's composition
If pre-treated cellulose fibers are mechanically disintegrated, then dispersion stability is improved, but energy consumption increases
Solution Approach 1:
The patent applies pre-treatment to cellulose fibers before mechanical disintegration, preparing the fibers in advance to require less energy-intensive processing. This preliminary chemical or enzymatic treatment weakens fiber bonds, making subsequent mechanical disintegration more energy-efficient while achieving the desired microfibrillation for stability.
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 process results in a stable, less hazardous dispersion with reduced dusting and improved handling, enabling efficient transportation and safer use in various applications.
Implementation Method 1
treating the slurry by mechanical disintegration so that a dispersion comprising microfibrillated cellulose is formed in which the nanoparticles are being absorbed to the surface of the microfibrillated cellulose
Data Source
AI summary
The present invention relates to a process for producing a dispersion comprising microfibrillated cellulose and nanoparticles wherein the process comprises the steps; providing a slurry comprising pre-treated cellulose fibers, adding nanoparticles to the slurry and treating the slurry by mechanical disintegration so that a dispersion comprising microfibrillated cellulose is formed in which the nanoparticles are being absorbed to the surface of the microfibrillated cellulose and/or being absorbed into the microfibrillated cellulose. The invention further relates to a dispersion produced according to the process, a paper or board product being coated with a coating comprising said dispersion and a paper or board product being produced from said dispersion as well as a composite comprising said dispersion.