Cationic Surface Sizing Agent for Paper
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Solution Overview
Problem
Conventional cationic surface sizing agents require large quantities and complex processes, including high organic solvent usage, to achieve effective sizing on papers without internal sizing agents, leading to inefficiencies and increased costs.
Innovation Solution
A cationic surface sizing agent is developed through solution polymerization using a tertiary amino group-containing monomer, alkyl(meth)acrylate, and styrenes at reduced styrene content ratios, with a chain transfer agent, allowing for improved copolymerizability and reduced solvent usage, enabling effective sizing without internal agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cationic surface sizing agents are used to achieve effective sizing on papers without internal sizing agents, then sizing effect is improved, but organic solvent usage and process complexity increase significantly
Solution Approach 1:
The patent changes the chemical composition parameters of the copolymer by controlling the ratio of tertiary amino group-containing monomer (15-35% by weight) to styrenes (1-50% by weight), enabling effective sizing with reduced solvent requirements and simplified processing
Solution Approach 2:
The patent creates a composite copolymer structure combining hydrophobic styrene units with cationic tertiary amino units, achieving both effective sizing on paper and reduced organic solvent usage through the synergistic interaction of these functional units
2Ease of manufacture
If high styrene content is used in copolymer composition, then copolymerizability is improved, but sizing efficiency on papers with low Stockigt sizing degree decreases
Solution Approach 1:
The patent optimizes the compositional parameters by limiting styrenes to 1-50% by weight and tertiary amino group-containing monomers to 15-35% by weight, achieving the right balance between copolymerizability and sizing efficiency on low Stockigt papers
3Stability of the object's composition
If large quantity of organic solvent is used for solution polymerization, then copolymer dissolution is improved, but productivity decreases due to complex distillation process
Solution Approach 1:
The patent changes the solvent-to-monomer ratio parameter, achieving complete copolymer dissolution with reduced organic solvent quantity, thereby eliminating or simplifying the distillation process and improving productivity
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 achieves enhanced sizing efficiency and productivity by ensuring complete dissolution of copolymer components on paper surfaces, improving hydrophobicity and sizing effects, even on papers with low Stockigt sizing degrees, while simplifying the solvent distillation process.
Implementation Method 1
ensuring complete dissolution of copolymer components on paper surfaces
Implementation Method 2
improving hydrophobicity and sizing effects
Data Source
AI summary
The invention improves a sizing effect even on paper containing no internal sizing agent and improves productivity by making solution polymerization in a small amount of an organic solvent. The invention provides a cationic surface sizing agent composed of a copolymer obtained by solution polymerization of (a) 15 to 35% by weight of a tertiary amino group-containing monomer, (b) 30 to 85% by weight of C1 to C4 alkyl(meth)acrylate, and (c) 1 to 50% by weight of styrenes in an organic solvent in the presence of a chain transfer agent. The copolymer may be subjected to cationization treatment with a quaternization agent. As a constituent monomer of the copolymer, 0 to 20% by weight of another copolymerizable vinyl monomer (d) may be contained. The cationic surface sizing agent is applied to paper.