Silane-Modified Urethane Coating for Low-Temperature Curing
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Solution Overview
Problem
Existing aqueous coating compositions that offer high coating film performance at low temperatures often have insufficient storage stability and may lack adequate abrasion resistance, chipping resistance, and glass adhesion properties.
Innovation Solution
An aqueous coating composition comprising a urethane resin particle aqueous dispersion obtained from a secondary amino group- and alkoxysilyl group-containing compound, and an isocyanate group-containing urethane prepolymer, along with a curing agent, where the curing agent is present in a range of 5 to 50 mass % based on the total resin solid amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low temperature curing is used to reduce energy consumption, then energy efficiency is improved, but coating film performance (abrasion resistance, chipping resistance, glass adhesion) deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material by incorporating silane-modified polyurethane resin and specific curing agents in optimized ratios. This allows the coating to achieve high performance at lower curing temperatures without sacrificing abrasion resistance, chipping resistance, or glass adhesion, thus resolving the contradiction between energy efficiency and coating film performance
Solution Approach 2:
The patent uses a composite coating system combining silane-modified polyurethane resin with specific curing agents (polybasic aromatic amine and/or polyisocyanate). This composite material approach enables the coating to achieve both low-temperature curing capability and high mechanical properties, eliminating the trade-off between energy consumption and coating performance
2Reliability
If high reactivity coating composition is used to achieve high coating film performance at low temperature, then coating film performance is improved, but storage stability deteriorates
Solution Approach 1:
The patent introduces silane-modified polyurethane resin as an intermediary component that reacts slowly and progressively with the curing agent. This intermediary approach allows the coating to remain stable during storage while achieving high performance after curing, as the silane groups provide controlled reactivity rather than immediate high reactivity
Solution Approach 2:
The patent performs preliminary modification of the polyurethane resin by incorporating silane groups during manufacturing. This preliminary action creates a more stable base material that can be stored longer without premature curing, while still achieving high coating film performance when the final curing reaction occurs after application
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 composition achieves excellent storage stability and enhanced abrasion resistance, chipping resistance, and glass adhesion properties even when cured at relatively low temperatures.
Implementation Method 1
a urethane resin (A) particle aqueous dispersion which is obtained from a component containing a secondary amino group- and alkoxysilyl group-containing compound (a1), and an isocyanate group-containing urethane prepolymer (a2)
Implementation Method 2
a component containing a secondary amino group- and alkoxysilyl group-containing compound (a1)
Data Source
AI summary
The purpose of the present invention is to provide an aqueous coating material composition which exhibits excellent storage stability and can form a coating film having excellent abrasion resistance, chipping resistance and adhesion to glass even if cured at a relatively low temperature. This aqueous coating material composition contains: an aqueous dispersion of particles of a urethane resin (A) obtained from a compound (a1) having a secondary amino group and an alkoxysilyl group and an isocyanate group-containing urethane prepolymer (a2); and a curing agent (B). The aqueous coating material composition is characterized in that: the compound (a1) having a secondary amino group and an alkoxysilyl group is obtained from constituent components including a compound (a11) containing a primary amino group and an alkoxysilyl group and a polymerizable unsaturated group-containing compound (a12); and the content of the curing agent (B) falls within the range 5-50 mass% relative to the total amount of solid resin content in the aqueous coating material composition.