Hydroxyl-Terminated Siloxane Defoamer Viscosity Reduction
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Solution Overview
Problem
The manufacturing of silicone-based defoamers is time and energy intensive due to the need for melting and mixing ingredients, and high shear forces required to homogenize silica particles, leading to inefficient production processes and potential surface disturbances in applications like papermaking.
Innovation Solution
The use of hydroxyl-terminated siloxanes, which have lower viscosity than methyl-terminated siloxanes, reduces processing time and energy by facilitating faster and easier dispersion of silica, resulting in improved defoaming performance without the need for complex silicone concentrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If methyl-terminated siloxanes are used to disperse silica particles, then the defoamer composition can be manufactured, but the viscosity of the filled silicone becomes too high (4000 cP at 90°C), making the dispersion process time-consuming and energy-intensive
Solution Approach 1:
The patent changes the chemical parameter of the siloxane from methyl-terminated to hydroxyl-terminated, which fundamentally alters the interaction with silica particles. This parameter change reduces the viscosity of the filled silicone from 4000 cP to 300 cP at 90°C, enabling faster and easier dispersion of silica particles while maintaining defoaming performance
Solution Approach 2:
The patent creates a composite material system where hydroxyl-terminated siloxane acts as a compatible binder with silica particles. The hydroxyl groups form strong interactions with silica surface hydroxyl groups, creating a well-dispersed composite structure that flows more easily during manufacturing compared to methyl-terminated alternatives
2Manufacturing precision
If high shear forces are applied to homogenize silica particles, then uniform particle size is achieved, but the manufacturing process requires excessive energy and time
Solution Approach 1:
Changing the siloxane termination from methyl to hydroxyl groups improves the wetting and dispersibility of silica particles. This parameter change allows achieving uniform particle size distribution with significantly reduced shear forces and shorter processing times, as the hydroxyl-terminated siloxane naturally promotes particle separation and uniform distribution
3Reliability
If complex silicone concentrates are added to improve defoaming performance, then the anti-foaming activity increases, but the device complexity and manufacturing steps increase
Solution Approach 1:
The patent extracts and eliminates the need for complex silicone concentrates by using hydroxyl-terminated siloxane alone. The simple two-component system (silica + hydroxyl-terminated siloxane) achieves defoaming performance comparable to or better than complex formulations, removing unnecessary ingredients and simplifying the overall composition
Solution Approach 2:
The patent changes the chemical structure parameter of the siloxane to hydroxyl-terminated, which provides inherent compatibility with silica particles and achieves effective defoaming performance without requiring additional complex concentrates or modifiers
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 hydroxyl-terminated siloxanes enable the production of silicone emulsion defoamers with enhanced anti-foaming activity and reduced production costs, performing equally well or better than commercially marketed methyl-terminated siloxane defoamers, while simplifying the manufacturing process.
Implementation Method 1
hydroxyl terminated siloxanes having substantially the same neat viscosity as methyl terminated siloxanes behave very differently rheologically when mixed with silica particles
Implementation Method 2
emulsifying said silicone phase in said aqueous phase to form said silicone in water emulsion defoamer composition
Data Source
AI summary
Disclosed herein are methods of defoaming industrial process streams, the methods comprising adding to the industrial process stream an emulsion comprising silicone emulsion droplets in a continuous aqueous phase. Also disclosed herein are defoamer compositions comprising these silicone emulsions and methods of making such compositions.