Modified Polysaccharides for Stable High-Solids Pigment Suspensions
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Solution Overview
Problem
Current high solids mineral pigment suspensions rely on petro-chemistry based dispersing agents, which are environmentally undesirable and pose safety risks due to complex production processes and hazardous by-products, necessitating the development of renewable, low-toxic alternatives that can maintain suspension stability and facilitate grinding without safety precautions.
Innovation Solution
The use of modified polysaccharides with a degree of carboxylation between 0.6 and 2.0 and intrinsic viscosity between 3 to 300 ml/g, which are derived from renewable sources and added in amounts from 0.05 wt.-% to 5.0 wt.-% to achieve Brookfield viscosity between 50 and 1500 mPa·s and solids content of 50 to 82 wt.-%, providing a stable and safe alternative for mineral pigment suspensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petro-chemistry based dispersing agents are used, then suspension stability and pumpability are improved, but environmental harm and safety risks increase
Solution Approach 1:
The patent changes the chemical composition parameters of dispersing agents from petro-chemistry based polymers to polymers derived from renewable resources with lower carbon dioxide footprint. This substitution maintains the functional parameters (suspension stability, pumpability) while improving the environmental parameter (reducing fossil CO2 pollution).
Solution Approach 2:
The patent employs biodegradable polymers from renewable resources that can be degraded naturally after use, replacing persistent petro-chemistry based dispersing agents. This approach allows the dispersing agents to fulfill their function during the product lifecycle and then decompose without long-term environmental harm.
2Quantity of substance
If high solids content is achieved, then transport and storage costs are reduced, but viscosity control and stability maintenance become more difficult
Solution Approach 1:
The patent uses modified polysaccharides with specific molecular weight ranges and controlled degrees of substitution to achieve optimal viscosity at high solids content. By carefully selecting polymer parameters (molecular weight, substitution degree), the suspension maintains stability and pumpability without requiring complex viscosity control mechanisms.
3Object-affected harmful factors
If renewable resource based polymers are used, then environmental footprint is reduced, but production complexity and cost may increase
Solution Approach 1:
The patent employs naturally occurring polysaccharides (starch, cellulose, chitin) that can be produced through established biological processes. These materials leverage nature's existing production pathways, reducing the need for complex synthetic chemistry processes while maintaining renewable resource benefits and lower carbon footprint.
4Reliability
If dispersing agent concentration is increased, then suspension stability is improved, but water dilution and energy consumption increase
Solution Approach 1:
The patent uses highly efficient dispersing agents with optimized molecular structures that achieve maximum stabilization effect at minimal concentrations. The modified polysaccharides are designed to maximize interaction with pigment particles, reducing the amount of dispersing agent needed and thereby minimizing water dilution and associated energy consumption for transport and processing.
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 modified polysaccharides effectively stabilize high solids mineral pigment suspensions, allowing for efficient grinding and reducing environmental impact by minimizing water usage and energy consumption, while eliminating the need for petro-chemistry based dispersants, thus adhering to environmental regulations like the Kyoto Protocol.
Implementation Method 1
The commonly used dispersing agents or grinding aids, which are efficient for the production and stabilisation of such high solids mineral pigments material suspensions
Implementation Method 2
Such high solid suspensions require usually the addition of a dispersing agent or grinding aid in order to maintain the suspension stability, pumpability and/or to allow grinding of such suspensions
Data Source
AI summary
The present invention relates to an aqueous suspension of mineral pigment materials having high solids content, which contain dispersing agents and/or grinding agents based on renewable sources, and methods for preparing such a suspension and its use.