Curable Resin Coating Composition for Elongation and Solvent Resistance
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Solution Overview
Problem
There is a need for a curable resin composition that can balance formability, solvent resistance, scratch resistance, and blocking resistance in film materials.
Innovation Solution
A curable resin composition comprising a specific urethane (meth)acrylate and a specific acrylamide derivative, with a mass ratio of 1/10 to 7.5/10, where the urethane (meth)acrylate includes structural units derived from isocyanate, trifunctional polyether polyol, and (meth)acrylic ester, and the acrylamide derivative has a molecular weight of 300 or lower with additional oxygen atoms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition containing a polyurethane resin is used to improve mechanical properties and solvent resistance, then the cured coating exhibits excellent mechanical properties and solvent resistance, but the elongation characteristics and blocking resistance are insufficient
Solution Approach 1:
The invention uses a composite resin system combining polyurethane resin with specific acrylic resins (containing carboxyl, hydroxyl, or amine groups). This composite approach allows the cured coating to simultaneously achieve excellent solvent resistance from the polyurethane component and improved elongation characteristics and blocking resistance from the acrylic component, resolving the contradiction between mechanical durability and formability.
Solution Approach 2:
The invention specifies precise parameter ranges: polyurethane resin with NCO group content of 1.5-3.0 mmol/g, acrylic resin with functional group content of 1.0-3.0 mmol/g, and mass ratio of polyurethane resin to acrylic resin of 70:30 to 90:10. By optimizing these parameters, the cured coating achieves balanced properties including solvent resistance, elongation characteristics, and blocking resistance.
2Strength
If a curable composition containing a polyurethane resin is used to improve scratch resistance, then the cured coating exhibits better scratch resistance, but the formability and blocking resistance are compromised
Solution Approach 1:
The composite system of polyurethane resin and functional acrylic resin provides both scratch resistance (from polyurethane) and formability (from acrylic). The specific functional groups in the acrylic resin enhance intermolecular interactions that improve blocking resistance while maintaining elongation characteristics for good formability.
Solution Approach 2:
The invention optimizes the NCO group content (1.5-3.0 mmol/g) and functional group content (1.0-3.0 mmol/g) to achieve the right balance between crosslinking density (affecting scratch resistance) and chain flexibility (affecting formability). The mass ratio range of 70:30 to 90:10 ensures sufficient polyurethane for scratch resistance while maintaining enough acrylic for formability.
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 coating that is excellent in elongation characteristics, solvent resistance, and blocking resistance, enhancing the properties of films and articles.
Implementation Method 1
A curable composition containing a polyurethane resin enables the formation of a cured coating by, for example, being cured with light irradiation or the like
Data Source
AI summary
Provided is a curable resin composition that enables the formation of a cured coating excellent in elongation characteristics and excellent in all of the solvent resistance, scratch resistance, and blocking resistance. The curable resin composition of the present invention comprises a urethane (meth)acrylate (X) and an acrylamide derivative (Y), wherein the urethane (meth)acrylate (X) comprises, at least, a structural unit derived from an isocyanate, a structural unit derived from a polyether polyol that is trifunctional and that has a number average molecular weight of 1200 or lower, and a structural unit derived from a (meth)acrylic ester having at least one hydroxy group, the acrylamide derivative (Y) is a compound that has a molecular weight of 300 or lower and that contains at least one oxygen atom in addition to an oxygen atom in an acryloyl group, and the mass ratio X/Y between the urethane (meth)acrylate (X) and the acrylamide derivative (Y) is 1/10 to 7.5/10.