Polysiloxane Anti-Soiling Composition for Paper Dry-Part Pitch Control
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Solution Overview
Problem
Existing anti-soiling agents fail to effectively prevent pitch adhesion to dry parts in paper-making processes due to high viscosity and stickiness issues, and insufficient mold-releasing and water-repellant properties.
Innovation Solution
An anti-soiling agent composition comprising a polysiloxane compound with a specific structure and number of amino-modified groups, combined with an emulsifier like polyethylene decyl ether, is applied to form a coat film that disperses pitch, preventing adhesion to dry parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stain adhesion preventive agent containing silicone oil and fluorine-based surfactant is used, then mold-releasing and water-repellant properties are improved, but the viscosity of the mixed silicone oil becomes too high causing insufficient pitch adhesion prevention
Solution Approach 1:
The patent changes the chemical structure parameters of the silicone oil from conventional types to cyclic polysiloxane structure (Formula 1), and controls the number of amino-modified groups per molecule within 0.5-5. This structural parameter change reduces viscosity while maintaining or enhancing the pitch dispersing capability, thereby resolving the contradiction between high viscosity and insufficient pitch prevention.
Solution Approach 2:
The patent creates a composite anti-soiling agent system combining cyclic polysiloxane with specific amino-modified groups and fluorine-based surfactants. The synergistic interaction between these components achieves both low viscosity for good flow characteristics and high pitch adhesion prevention effectiveness, while maintaining mold-releasing and water-repellant properties.
2Reliability
If anti-soiling agent composition with amino modified groups is applied, then fixability to roll surface is improved, but pitch adhesion prevention is insufficient depending on amino modified group structure and number
Solution Approach 1:
The patent optimizes the number of amino-modified groups per polysiloxane molecule to be within 0.5-5, and specifies the structural parameters of the amino-modified group (Formula 2) with controlled carbon chain length and cyclic structure. This precise parameter control ensures sufficient fixability to the roll surface while achieving effective pitch adhesion prevention through optimal molecular configuration.
3Reliability
If conventional silicone oil is used, then water-repellant properties are provided, but the silicone oil itself exerts stickiness preventing sufficient pitch adhesion prevention
Solution Approach 1:
The patent transforms the silicone oil structure from conventional linear chains to cyclic polysiloxane (Formula 1) with controlled molecular weight and introduces amino-modified groups (Formula 2). This structural transformation reduces the inherent stickiness of silicone oil while preserving water-repellant properties through the hydrophobic character of the cyclic siloxane backbone and fluorine-based surfactants.
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 composition effectively prevents pitch adhesion to dry parts, improving paper yield by forming a stable coat film and enhancing emulsification stability, while maintaining paper color and preventing discoloration.
Implementation Method 1
a coat film is formed on a dry part region so as to disperse pitch
Implementation Method 2
an emulsifier wherein the emulsifier is one member selected from the group consisting of polyethylene decylether, polyethylene cetylether and polyethylene stearylether
Data Source
Figure 1
AI summary
[Object] To provide an anti-soiling agent compound that can sufficiently prevents adhesion of pitch to a dry part region. [Solution] The present invention provides an anti-soiling agent composition for preventing pitch contamination in a dry part of a paper-making process, and the composition has a polysiloxane compound represented by the following formula (1), wherein the number of amino-modified groups per molecule of the polysiloxane compound is in a range from 0.5 to 5. [wherein, a substituent R1 represents a methyl group or an amino-modified group represented by the following formula (2), and the number n of repeating siloxane units represents an integer in a range from 50 to 1000, and wherein, each of a substituent R2 and a substituent R3 independently represents an alkylene group having carbon atoms of 1 to 6, and the number m of repeating amino-alkylene units represents an integer in a range from 0 to 2].