Coating Composition with Zinc-Amidine Catalyst for Fast Curing
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Solution Overview
Problem
Existing hydroxy group/isocyanate group-crosslinked coating compositions require organotin compounds as catalysts, which are toxic and have limited pot life, necessitating a non-toxic alternative that maintains low-temperature and short-time curability.
Innovation Solution
A coating composition comprising a hydroxy group-containing resin, a polyisocyanate compound, an organometallic catalyst formed of a zinc compound and an amidine compound, and a phosphate group-containing compound, which replaces organotin catalysts to enhance pot life and maintain low-temperature and short-time curability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an organotin compound is used as a catalyst to accelerate the curing reaction, then the catalytic performance is extremely high, but the toxicity becomes a problem
Solution Approach 1:
The patent removes the toxic organotin compound from the catalyst system and replaces it with a non-toxic organometallic catalyst formed of a zinc compound and an amidine compound, thereby eliminating the harmful factor while maintaining catalytic functionality
Solution Approach 2:
The patent changes the chemical composition parameters of the catalyst by specifying precise ratios of the zinc compound (0.01-5 parts by mass) and amidine compound (0.01-5 parts by mass) relative to the hydroxy group-containing resin, achieving optimal catalytic performance without toxicity
2Productivity
If the curing reaction is accelerated to achieve low-temperature and short-time curability, then the bake curing step is shortened, but the pot life is reduced
Solution Approach 1:
The patent creates a dynamic catalyst system where the organometallic catalyst formed of zinc compound and amidine compound provides strong catalytic activity at curing temperature but remains controlled during storage, allowing both fast curing and extended pot life through temperature-dependent catalyst activation
Solution Approach 2:
The patent uses a composite catalyst system combining zinc compound and amidine compound, where the synergistic interaction between these two components provides both high catalytic activity for fast curing and controlled reactivity for extended pot life
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 composition achieves excellent low-temperature and short-time curability with improved pot life, eliminating the need for toxic organotin compounds and ensuring effective curing without compromising performance.
Implementation Method 1
an organometallic catalyst formed of a zinc compound and an amidine compound
Implementation Method 2
a phosphate group-containing compound... achieves excellent low-temperature and short-time curability with improved pot life
Implementation Method 3
then heating the coating film to cure the coating film
Data Source
AI summary
Provided are a coating composition including: (A) a hydroxy group-containing resin; (B) a polyisocyanate compound; (C) an organometallic catalyst formed of a zinc compound and an amidine compound; and (D) a phosphate group-containing compound, and a coating film forming method including: coating a top of a material to be coated with the above-mentioned coating composition to form a coating film; and then heating the coating film to cure the coating film.