Silicon Dioxide Dispersion Viscosity Control via Cationizing Agent
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Solution Overview
Problem
Existing silicon dioxide-containing dispersions for inkjet coating slips face challenges with high viscosity when cationic polymers are added, making it difficult to process dispersions with high filler content, which affects the print quality and processability.
Innovation Solution
A dispersion process involving silicon dioxide particles and cationizing agents, where haloalkyl-functional alkoxysilanes and aminoalcohols are reacted to form cationizing agents, which are then dispersed with silicon dioxide particles, improving the processability and print quality of inkjet coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If known cationic polymers are added to silicon dioxide dispersions to improve waterfastness and ink density, then print quality is improved, but viscosity increases extremely making processing impossible
Solution Approach 1:
The patent changes the chemical parameters of the cationizing agent by using specifically designed haloalkyl-functional alkoxysilanes with controlled molecular structures and functionality. This modifies the interaction mechanism with silicon dioxide particles, achieving effective cationization at much lower concentrations (0.1-5 wt%) compared to conventional polymers, thereby improving print quality without excessive viscosity increase
Solution Approach 2:
The invention creates a composite system where haloalkyl-functional alkoxysilane molecules are grafted onto silicon dioxide particle surfaces. This forms a hybrid structure combining inorganic particle cores with organic cationic functional groups, achieving effective ink acceptance and waterfastness while maintaining dispersion流动性 due to the efficient space utilization of the grafted layers
2Quantity of substance
If high filler content is used in dispersions to improve formulatability and reduce water evaporation, then ecology and economics are improved, but viscosity increases making processing impossible
Solution Approach 1:
The patent changes the surface chemical parameters of silicon dioxide particles by grafting haloalkyl-functional alkoxysilane cationizing agents. This modification alters the surface charge and steric characteristics, enabling high solids content dispersions (40-80 wt% SiO2) to maintain adequate流动性 and processability through electrostatic and steric stabilization mechanisms
Solution Approach 2:
The invention applies cationizing functionality locally at the particle surface through controlled grafting of haloalkyl-functional alkoxysilanes. This localized modification ensures that the bulk dispersion maintains the low viscosity characteristics of the base solvent while the surface-modified particles provide the necessary ink acceptance and waterfastness properties
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 dispersion that maintains high solids content and improved print quality while reducing viscosity, enabling efficient processing and environmental benefits, with enhanced waterfastness and ink density.
Implementation Method 1
the cationizing agent is obtainable by reacting at least one haloalkyl-functional alkoxysilane, its hydrolysis products or condensation products and/or a mixture thereof with at least one aminoalcohol
Data Source
AI summary
Process for preparing a dispersion comprising silicon dioxide particles and cationizing agents, by dispersing 50 to 75 parts by weight of water, 25 to 50 parts by weight of silicon dioxide particles having a BET surface area of 30 to 500 m2/g and 100 to 300 μg of cationizing agent per square meter of the BET surface area of the silicon dioxide particles, wherein the cationizing agent is obtainable by reacting at least one haloalkyl-functional alkoxysilane, hydrolysis products, condensation products and/or mixtures thereof with at least one aminoalcohol and water; and optionally removing the resulting hydrolysis alcohol from the reaction mixture. Also the process for preparing the dispersion, wherein the cationizing agent comprises one or more quaternary, aminoalcohol-functional, organosilicon compounds of formula III and/or condensation products thereof, wherein Ru and Rv are independently C2-4 alkyl group, m is 2-5 and n is 2-5.