Lignin-Carbohydrate Complex Dispersion Agent for Paper Coating Slurries
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Solution Overview
Problem
Conventional petroleum-based synthetic polymer dispersion agents used in aqueous slurries for coating colour compositions on paper and board are being replaced by materials from renewable sources, while maintaining viscosity and stability at the same level.
Innovation Solution
An anionic lignin-carbohydrate complex, covalently bound with monosaccharides, is used as a dispersion agent in aqueous slurries comprising inorganic mineral particles, providing similar or improved properties compared to conventional agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-based synthetic polymer dispersion agents are used, then the viscosity and stability of the aqueous slurry are improved, but the use of renewable materials is reduced
Solution Approach 1:
The invention changes the chemical composition parameters by replacing petroleum-based synthetic polymers with lignin-carbohydrate complexes derived from renewable lignocellulosic materials. This substitution maintains the dispersion functionality while altering the source material parameter to meet sustainability requirements.
Solution Approach 2:
The invention recovers and utilizes lignin, which is typically a byproduct or waste material from the paper and pulp industry, transforming it into a valuable dispersion agent. This approach converts a discarded material into a functional component that meets performance requirements.
2Stability of the object's composition
If petroleum-based synthetic polymer dispersion agents are used, then the viscosity and stability of the aqueous slurry are improved, but the reliance on synthetic polymers increases
Solution Approach 1:
The invention fundamentally changes the material origin parameter from synthetic petroleum-based polymers to natural lignin-carbohydrate complexes. This parameter change reduces dependency on synthetic polymers while maintaining the stabilizing function through the anionic characteristics and molecular structure of lignin.
3Adaptability or versatility
If renewable materials are used to replace synthetic dispersion agents, then the use of renewable sources is increased, but the viscosity and stability properties may deteriorate
Solution Approach 1:
The invention utilizes composite materials by combining lignin with carbohydrate components to form lignin-carbohydrate complexes. This composite structure leverages the complementary properties of both components, where lignin provides anionic charge for dispersion and carbohydrates contribute to molecular weight and structural integrity, ensuring both renewable sourcing and performance.
Solution Approach 2:
The invention optimizes parameters such as molecular weight, anionic charge density, and carbohydrate content in the lignin-carbohydrate complex to achieve performance parity with synthetic polymers. By carefully controlling these parameters, the natural composite material achieves the necessary viscosity and stability characteristics.
4Loss of substance
If conventional dispersion agents are replaced, then the use of synthetic polymers is reduced, but the properties of the aqueous slurry may change
Solution Approach 1:
The invention adjusts key parameters including anionic charge density, molecular weight, and carbohydrate composition to match the performance characteristics of conventional synthetic dispersion agents. These parameter optimizations ensure that the replacement material maintains equivalent slurry stability and rheological 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 anionic lignin-carbohydrate complex maintains the stability and viscosity of the slurry, making it suitable for coating colour compositions, reducing the reliance on synthetic polymers and increasing the use of renewable materials.
Implementation Method 1
a dispersion agent, which is an anionic lignin-carbohydrate complex... reduce interactions between pigment particles and lower the viscosity of pigment mixtures
Data Source
AI summary
The invention relates to an aqueous slurry for manufacture of a coating composition for paper, board or the like, which comprises inorganic mineral particles and a dispersion agent, which is an anionic lignin-carbohydrate complex where lignin and carbohydrate are covalently bound with each other.