Aerogel Coating Liquid With Amphiphilic Polymer Dispersion
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Solution Overview
Problem
Existing coating liquids struggle to disperse aerogel particles uniformly and achieve sufficient film strength when forming coating films with high filling rates of aerogel particles.
Innovation Solution
A coating liquid containing aerogel particles, a water-soluble polymer with a hydrophobic group, and a water-based medium, which improves dispersibility and film strength, allowing for a high filling rate of aerogel particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aerogel particles are used as filler in coating liquid, then heat insulating properties are improved, but dispersibility of aerogel particles deteriorates
Solution Approach 1:
The patent introduces a water-soluble polymer with a hydrophobic group as an intermediary substance between the aerogel particles and the water-based medium. This polymer contains both hydrophilic regions (water-soluble) and hydrophobic regions (alkyl groups with 1-26 carbon atoms), allowing it to bridge the hydrophobic aerogel particles and the hydrophilic water-based medium, thereby improving dispersibility while maintaining heat insulating properties
Solution Approach 2:
The patent creates a composite system consisting of aerogel particles, water-soluble polymer with hydrophobic groups, and water-based medium. This composite approach combines materials with different properties (hydrophobic aerogel, amphiphilic polymer, hydrophilic water) to achieve both good dispersibility and heat insulation performance
2Temperature
If filling rate of aerogel particles is increased, then heat resistance is improved, but film strength deteriorates
Solution Approach 1:
The water-soluble polymer with hydrophobic groups acts as a binding intermediary between aerogel particles, forming a network structure that maintains film integrity even at high aerogel filling rates (70 vol % or more). The polymer chains wrap around and bind to the hydrophobic surfaces of aerogel particles, creating strong interfacial adhesion that prevents particle aggregation and maintains coating film strength
Solution Approach 2:
The patent changes the chemical parameters of the binder by selecting a water-soluble polymer with specific hydrophobic groups (alkyl groups with 1-26 carbon atoms). This parameter change allows the binder to effectively interact with aerogel particle surfaces while maintaining solubility in water-based medium, enabling high filling rates without sacrificing film strength
3Reliability
If filling rate of aerogel particles is increased, then heat insulating properties are improved, but uniformity of particle distribution deteriorates
Solution Approach 1:
The water-soluble polymer with hydrophobic groups serves as a steric barrier and intermediary layer between aerogel particles, preventing direct particle-to-particle contact and aggregation. The hydrophobic groups adsorb onto aerogel surfaces while the hydrophilic polymer chains extend into the water-based medium, creating repulsive forces that maintain uniform particle distribution even at high filling rates
Solution Approach 2:
The patent optimizes the molecular structure parameters of the water-soluble polymer, specifically the length and branching of hydrophobic alkyl groups (1-26 carbon atoms), to achieve optimal balance between particle surface coverage and steric stabilization. This parameter optimization ensures uniform particle distribution while maintaining high filling rates for superior heat insulation
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 enables the formation of a coating film with excellent dispersibility and film strength, maintaining a high filling rate of aerogel particles.
Implementation Method 1
a water-soluble polymer having a hydrophobic group
Data Source
AI summary
This coating liquid contains: aerogel particles; a water-soluble polymer having a hydrophobic group; a binder resin; and a liquid medium, wherein the water-soluble polymer comprises a cellulose based resin having an alkyl group having 6 to 26 carbon atoms. The coating liquid is capable of forming a coating film having a high filling rate of aerogel particles and an excellent film strength and is excellent in terms of the dispersibility of aerogel particles.