Mineral Suspension Stabilization via Alpha-Sulphonated Polymer
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Solution Overview
Problem
Existing methods for preparing aqueous suspensions of mineral materials face challenges in controlling particle size distribution, stability, viscosity, and solids content, often requiring harmful or restricted phosphorus-containing compounds, which can lead to gelation and particle settling, affecting the quality and productivity of papermaking processes.
Innovation Solution
An aqueous suspension of mineral particles is prepared using an α-sulphonated polymer, completely or partially neutralized by a monovalent ion, in the absence of phosphorus compounds, with a sulphur compound in oxidation state IV, and a sulpho-carboxylic acid, to achieve stable and high-solids-content suspensions with controlled viscosity and particle size, suitable for papermaking and coating applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phosphorus-containing compounds are used as dispersing agents, then particle size distribution can be controlled, but gelation and particle settling occur leading to reduced stability
Solution Approach 1:
The invention extracts and eliminates phosphorus-containing compounds from the dispersing agent system. The patent specifically uses polymers prepared in the absence of phosphorus compounds, thereby removing the harmful substance while maintaining dispersing functionality through alternative polymer compositions.
Solution Approach 2:
The invention changes the chemical composition parameters of the dispersing agent by using polymers with specific functional groups (carboxylic, sulphonic, phosphonic, or a combination) while controlling the absence of phosphorus in oxidation states I, III, or V. This parameter change allows maintaining particle size control while preventing gelation and settling.
2Productivity
If high solids content is achieved in aqueous suspensions, then productivity increases, but viscosity control becomes difficult and handling becomes problematic
Solution Approach 1:
The invention uses specifically designed polymer dispersing agents as intermediaries to enable high solids content suspensions to maintain appropriate viscosity and stability. These polymers, containing specific functional groups and prepared without phosphorus compounds, act as mediators between the mineral particles and water, allowing high productivity while ensuring ease of handling.
3Reliability
If phosphorus compounds in oxidation state I, III or V are used, then dispersing effectiveness improves, but environmental harm and regulatory restrictions increase
Solution Approach 1:
The invention converts the potential harm of phosphorus compounds by completely eliminating them from the system. Instead of using phosphorus in oxidation states I, III, or V, the patent employs alternative polymer compositions with carboxylic, sulphonic, phosphonic, or combined functional groups that provide equivalent or superior dispersing effectiveness without environmental harm.
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 provides stable, high-solids-content suspensions with controlled viscosity and particle size, enhancing the efficiency and quality of papermaking and coating processes while avoiding harmful compounds, thereby improving the overall yield and physical properties of paper.
Implementation Method 1
a polymerisation reaction of at least one monomer A chosen among acrylic acid, methacrylic acid, an acrylic acid salt, a methacrylic acid salt and combinations thereof, in the presence of at least one initiator compound and of at least one sulphur compound T comprising sulphur in oxidation state IV
Implementation Method 2
completely or partially neutralised solely by means of at least one monovalent ion
Data Source
AI summary
Provided is an aqueous suspension of a mineral material prepared using an improved aqueous dispersion of a (meth)acrylic polymer neutralized with a monovalent ion. Also provided is a dispersant including the aqueous suspension of a mineral material and methods for the preparation of a mass filler for the production of paper using the aqueous suspension of a mineral material, the preparation of a paper coating slip aqueous suspension of a mineral material, and the preparation of a coating composition aqueous suspension of a mineral material.