Isosorbide Epoxy Antifogging Coating for Glass Durability
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Solution Overview
Problem
Existing antifogging technologies, such as ultra-hydrophilic surfaces and epoxy resin coatings, face limitations in durability, chemical resistance, light resistance, and adhesion, which affect their ability to continuously prevent fogging on surfaces like vehicle and building glass without compromising optical clarity.
Innovation Solution
A composition for antifogging coating comprising isosorbide epoxy, a polyamine-based hardener, an imidazole or tertiary amine-based hardening accelerator, and an epoxy silane coupling agent, which forms a coating film with high water absorption, durability, and adhesion to glass, eliminating the need for a separate bonding layer and maintaining high light transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultra-hydrophilic surface is formed by creating minute structures on the surface, then water droplets spread rapidly and light scattering is prevented, but the minute structures cannot maintain their shapes under pressure and abrasion, resulting in poor durability
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by using specific ratios of polyepoxide (30-70 wt%), polyisocyanate (10-40 wt%), and polyester polyol (10-40 wt%), creating a coating film with optimized molecular structure that provides both hydrophilicity and mechanical durability without relying on fragile minute structures
Solution Approach 2:
The patent creates a composite coating film by combining multiple polymer components (polyepoxide, polyisocyanate, polyester polyol) that work synergistically to provide both the hydrophilic properties needed for antifogging and the mechanical strength required for durability against pressure and abrasion
2Reliability
If a coating film using epoxy resin is formed to prevent fogging, then water absorption is improved, but the saturated water absorption amount is insufficient, preventing continuous antifogging performance
Solution Approach 1:
The patent optimizes the chemical composition parameters by incorporating polyester polyol alongside polyepoxide and polyisocyanate, creating a coating film with enhanced water absorption capacity that achieves sufficient saturated water absorption amount for continuous antifogging performance
Solution Approach 2:
The patent develops a composite polymer coating system where polyester polyol contributes additional hydrophilic groups and water absorption capacity, working synergistically with polyepoxide and polyisocyanate to achieve both high water absorption and sustained antifogging effect
3Strength
If a separate bonding layer is applied to improve adhesion to glass, then adhesion is enhanced, but the device complexity and manufacturing process are increased
Solution Approach 1:
The patent merges the adhesion function into the main coating formulation by incorporating specific polyepoxide and polyisocyanate components that provide inherent bonding capability to glass substrates, eliminating the need for a separate bonding layer while maintaining strong adhesion
Solution Approach 2:
The patent creates a multi-functional coating film where a single coating layer simultaneously provides adhesion to glass, antifogging performance through water absorption, and durability against pressure and abrasion, replacing what would traditionally require multiple separate layers
4Reliability
If a coating film is applied to prevent fogging, then antifogging performance is improved, but light transmissivity is reduced, affecting optical characteristics
Solution Approach 1:
The patent forms a thin coating film that provides antifogging functionality while minimizing impact on light transmissivity, optimizing the balance between protective function and optical clarity
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 coating film effectively prevents fogging for extended periods with high chemical and light resistance, ensuring durability and optical clarity, making it suitable for vehicle and building glass applications without requiring additional adhesion layers.
Implementation Method 1
a technology of preventing fogging by forming a coating film using epoxy resin exhibiting water absorption on a surface of a product
Implementation Method 2
an ultra-hydrophilic surface has a contact angle of 10° or less to water, water droplets are not formed on the ultra-hydrophilic surface and spread rapidly
Implementation Method 3
a silane coupling agent
Data Source
AI summary
A composition for an antifogging coating includes isosorbide epoxy represented by Formula 1 below, a hardener, a hardening accelerator, and a silane coupling agent,wherein n is 0.2 to 7.