Resin Crosslinking Agent Scuffing Resistance
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Solution Overview
Problem
Aqueous resin crosslinking agents, such as carbodiimide compounds, do not adequately provide scuffing resistance and chemical resistance when used in floor coatings cured at room temperature, despite offering water resistance and adhesiveness.
Innovation Solution
A resin crosslinking agent comprising a carbodiimide compound with isocyanate terminals capped by hydrophilic organic compounds and a water-miscible liquid compound, specifically formulated to enhance scuffing and chemical resistance, with a defined ratio of water-miscible liquid compound to water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbodiimide compound is used as crosslinking agent for aqueous resin, then water resistance and adhesiveness are obtained, but scuffing resistance and chemical resistance are insufficient when cured at room temperature
Solution Approach 1:
The patent combines carbodiimide compound with specific compounds (cyclic carbonate, cyclic carboxylate, or hydroxycarboxylic acid) to create a composite crosslinking system. This composite approach allows the mixture to provide both water resistance (from carbodiimide) and enhanced scuffing/chemical resistance (from the additional compounds), resolving the contradiction by integrating multiple material functions into a single crosslinking agent composition.
2Strength
If external crosslinking agent is used to enhance strength and water resistance, then durability is improved, but unreacted crosslinking agent causes toxicity in coated film
Solution Approach 1:
The patent extracts and eliminates the toxic component (unreacted crosslinking agent) by using carbodiimide compound which exhibits high reactivity with carboxyl groups, ensuring complete reaction. Additionally, the decomposition products of carbodiimide (urea and CO2) are non-toxic, effectively removing the toxicity problem while maintaining the strength-enhancing benefits of crosslinking.
3Reliability
If crosslinking reaction proceeds to enhance water resistance and durability, then coated film properties are improved, but unreacted carboxyl group remains lowering water resistance and durability
Solution Approach 1:
The patent changes the reactivity parameter of the crosslinking agent by using carbodiimide compound, which has high reactivity toward carboxyl groups. This parameter change ensures complete consumption of carboxyl groups during crosslinking, preventing any remaining unreacted carboxyl groups that would compromise water resistance and durability, while maintaining stable coated film composition.
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 significantly improves scuffing resistance and chemical resistance of aqueous resin-based coatings, ensuring durability and performance in flooring applications.
Implementation Method 1
an external crosslinking agent, such as an aqueous melamine resin, an aziridine compound and a water dispersible isocyanate compound, which is capable of forming a crosslinked structure through reaction with the carboxyl group
Implementation Method 2
a compound that has higher hydrophilicity than the particular hydrophilic organic compound and has at least one hydroxyl group
Data Source
AI summary
A resin crosslinking agent that is capable of enhancing the scuffing resistance and the chemical resistance upon adding a carbodiimide compound as a crosslinking agent to an aqueous resin. The resin crosslinking agent contains: a carbodiimide compound having at least one carbodiimide group, having terminals that are capped with at least one compound (hydrophilic organic compound I) selected from a dialkylamino alcohol, a hydroxycarboxylic acid alkyl ester and a (poly)alkylene glycol monoalkyl ether, and with a compound (hydrophilic organic compound II) that has higher hydrophilicity than the hydrophilic organic compound I and has at least one hydroxyl group; and a water-miscible liquid compound.