Polyurethane Coating Composition for Adhesion and Chemical Resistance
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Solution Overview
Problem
Existing polyurethane resin coatings face issues with adhesion, hardness, scratch resistance, and chemical resistance, particularly when exposed to chemicals like sunscreen, leading to detachment or deterioration.
Innovation Solution
A composition comprising a polyol compound with an isocyanurate skeleton and a polyisocyanate compound, combined with a polyester polyol at a specific ratio, and optionally including a polysiloxane derivative and solvent, forms a cured product that enhances adhesion, hardness, and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polyurethane resin coating is used, then adhesion to substrate is achieved, but chemical resistance deteriorates when exposed to agents like sunscreen
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific compounds: a polyol compound with isocyanurate skeleton (Formula 1), a polyisocyanate compound with isocyanurate skeleton (Formula 2), and a polyester polyol with controlled hydroxyl value (80-850). This specific compositional parameter change provides both adhesion and chemical resistance simultaneously
Solution Approach 2:
The patent uses a composite material system combining three key components: (1) polyol compound with isocyanurate skeleton, (2) polyisocyanate compound with isocyanurate skeleton, and (3) polyester polyol. This composite approach creates synergistic effects that provide both substrate adhesion and resistance to chemical agents like sunscreen
2Strength
If coating film hardness is increased, then scratch resistance is improved, but adhesion to substrate may deteriorate
Solution Approach 1:
The patent achieves both hardness and adhesion by changing the chemical structure parameters of the polyol compound (Formula 1) and polyisocyanate compound (Formula 2), both containing isocyanurate skeletons. The specific molecular structures and functional groups provide a balance between crosslinking density (for hardness) and substrate bonding capability (for adhesion)
Solution Approach 2:
The composite material system combines rigid isocyanurate-based polymers (providing hardness and scratch resistance) with polyester polyol components (providing flexibility and adhesion). This composite structure allows the coating to maintain both mechanical strength and substrate bonding
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 forms a cured product with improved adhesion, hardness, and chemical resistance, maintaining excellent appearance and resistance to scratches and chemicals over time, even when exposed to substances like sunscreen.
Implementation Method 1
a composition containing a polyol compound (A) and an isocyanate compound (B)... a cured product of the composition
Data Source
AI summary
Provided is a composition capable of forming a cured product excelling in adhesion to a substrate, hardness, scratch resistance, and chemical resistance. The composition of the present disclosure contains a polyol compound (A) and an isocyanate compound (B). The polyol compound (A) includes a compound (a1) represented by Formula (1) below, where R1 to R3 each are a group represented by Formula (1a), the compound (a1) having a number average molecular weight (calibrated with polystyrene standard) of 800 or greater. The isocyanate compound (B) includes a polyisocyanate compound having an isocyanurate skeleton.