Water-Soluble Polymer Complexes for Paper Filler Retention
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Solution Overview
Problem
Existing methods for improving the retention of mineral fillers in papermaking face logistical challenges due to separate additions of polymers with different molecular weights, leading to phase separation issues and unsatisfactory optical properties in paper products.
Innovation Solution
A complex of water-soluble polymers is developed, where a host polymer with vinylamine functions acts as a crosslinking agent during the polymerization of water-soluble monomers in the presence of a non-polymeric transfer agent, preventing phase separation and controlling polymer chain length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple polymers with different molecular weights are introduced into the cellulose suspension to improve filler retention, then the optical properties of paper are improved, but phase separation occurs during dissolution of the polymers
Solution Approach 1:
The patent combines multiple polymer functions into a single complex formed by polymerizing water-soluble monomers in the presence of a host polymer. This creates an interconnected polymer structure where different polymer components are merged at the molecular level, preventing phase separation while maintaining the synergistic effects of multiple polymers for improved filler retention and optical properties.
Solution Approach 2:
The invention creates a composite polymer complex consisting of a host polymer and grafted polymer chains formed from water-soluble monomers. This composite structure combines the properties of different polymer components into a single homogeneous material that maintains stability in aqueous suspension while providing enhanced filler retention and optical properties.
2Reliability
If several polymers are added separately at various points to improve filler retention, then the optical properties of paper are improved, but the system complexity and logistical requirements increase
Solution Approach 1:
The patent merges multiple separate polymer addition steps into a single polymer complex that is added once to the cellulose suspension. The complex contains multiple polymer components formed during synthesis, eliminating the need for separate metering and addition of each polymer while maintaining the synergistic filler retention effects.
Solution Approach 2:
The polymer complex serves multiple functions simultaneously: it acts as a filler retention agent, provides optical properties enhancement, and maintains homogeneous distribution in the suspension. This multi-functional polymer eliminates the need for multiple specialized polymer additions, simplifying the overall papermaking process.
3Reliability
If polymers with different molecular weights are used to improve filler retention, then the optical properties of paper are improved, but the preparation of homogeneous composition becomes difficult
Solution Approach 1:
The patent performs preliminary polymerization of water-soluble monomers in the presence of a host polymer to create a homogeneous polymer complex before adding it to the cellulose suspension. This preliminary formation of the polymer complex ensures homogeneous composition from the start, eliminating dissolution and mixing problems that would otherwise occur with separate polymer additions.
Solution Approach 2:
The invention combines multiple polymer components into a single interconnected polymer structure during the polymerization process. This merging occurs at the molecular level, creating a homogeneous composition that is easy to prepare and add to the suspension, while maintaining the benefits of multiple polymer types for filler retention.
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
This approach results in a homogeneous mixture of interconnected polymers that effectively improves filler retention and optical properties in paper products, outperforming previous methods by maintaining superior performance qualities without phase separation.
Implementation Method 1
a host polymer with vinylamine functions acts as a crosslinking agent during the polymerization of water-soluble monomers
Implementation Method 2
in the presence of a non-polymeric transfer agent, controlling polymer chain length
Implementation Method 3
effectively improves filler retention
Data Source
AI summary
Polymer complex obtained by polymerization of water-soluble monomers: in the presence of a host polymer comprising vinylamine functions and of a non-polymeric transfer agent, and in the absence of branching or crosslinking agent of ethylenic polyfunctional type.