Alcohol-Resistant Polyurethane Floor Coating with Chemical Strippability
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Solution Overview
Problem
Conventional polyurethane floor finishes are either not alcohol-resistant or difficult to remove with chemical strippers, and existing alcohol-resistant polyurethane finishes have limited pot life and are not easily strippable from various flooring substrates without using caustic components.
Innovation Solution
A chemically-strippable, alcohol-resistant polyurethane floor coating system comprising a crosslinked polymer, an alkali soluble resin, and an amine functional compound, which allows for easy removal with a wide range of chemical strippers and maintains ethanol resistance, while having a prolonged pot life of up to 10 days.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane floor finish is used to achieve alcohol resistance, then ethanol resistance is improved, but ease of removal with chemical stripper deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of polyurethane by incorporating specific ratios of polyol (40-70 parts), polyisocyanate (10-30 parts), and stripping agents (5-20 parts). This parameter adjustment creates a formulation that maintains alcohol resistance while enabling chemical strippability, resolving the contradiction between durability and ease of removal.
Solution Approach 2:
The invention creates a composite floor finish system combining multiple components: polyol, polyisocyanate, stripping agents, and optional additives. This composite approach allows the coating to simultaneously achieve alcohol resistance from the polyurethane network and ease of removal through the incorporated stripping agents, eliminating the need for caustic chemicals.
2Reliability
If two-component polyol and polyisocyanate system is used to achieve alcohol resistance and chemically-strippability, then both strippability and ethanol resistance are improved, but pot life deteriorates
Solution Approach 1:
The patent incorporates stripping agents and other functional components into the coating formulation before application. This preliminary preparation allows the coating to maintain stability and suitability for application over extended periods (up to 10 days) while still achieving chemically-strippability after curing, effectively extending pot life without compromising performance.
Solution Approach 2:
The invention adjusts the chemical parameters of the coating system by incorporating specific amounts of polyol (40-70 parts), polyisocyanate (10-30 parts), and stripping agents (5-20 parts) in optimized ratios. These parameter changes slow the reaction rate between polyol and polyisocyanate, extending pot life to 10 days while maintaining the desired strippability and alcohol resistance properties.
3Productivity
If caustic stripper is used to remove conventional polyurethane finish, then removal effectiveness is improved, but damage to flooring substrates deteriorates
Solution Approach 1:
The patent incorporates non-caustic stripping agents within the coating formulation that serve their purpose during application and then degrade harmlessly. These temporary stripping components enable effective removal without the harmful effects of caustic chemicals, protecting the flooring substrate while maintaining removal effectiveness.
Solution Approach 2:
The invention introduces non-caustic stripping agents as intermediary substances that facilitate the removal process. These agents act as mediators between the coating and the stripping action, enabling effective removal while avoiding the harmful effects of traditional caustic strippers on the flooring substrate. The coating itself contains the stripping agents, eliminating the need for separate caustic chemical applications.
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 new coating system achieves high strippability and ethanol resistance, making it suitable for various flooring substrates and extending the application time without compromising performance.
Implementation Method 1
a chemically-strippable, alcohol-resistant polyurethane floor coating... comprises crosslinked polymer, an alkali soluble resin, and an amine functional compound
Implementation Method 2
an alkali soluble resin... which allows for easy removal with a wide range of chemical strippers
Implementation Method 3
the polyol reacts with the polyisocyanate to form a polyurethane network
Data Source
AI summary
A chemically-strippable, alcohol-resistant floor coating contains a crosslinked polymer, an alkali soluble resin, and an amine functional compound. The coating exhibits a Strippability Level of at least 40% after 300 cycles in a solvent on an abrasion machine, and an Ethanol Resistance of at least 60 percent, as measured by a 60° Gloss Retention Test. A floor coating composition comprising an aqueous dispersion of a crosslinkable polymer, an alkali soluble resin, an amine functional compound, and a crosslinker can be applied to a floor to make the coating.