Electron Beam Curable Coating Double Network Structure
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Solution Overview
Problem
Conventional electron beam curable coating compositions containing multifunctional (meth)acrylates struggle to achieve both high breaking elongation and high tensile strength, as the addition of polyisocyanate does not sufficiently enhance adhesion and curability.
Innovation Solution
A combination of an electron beam curable component with 10% or more multifunctional (meth)acrylate and a room temperature curable component containing 1-15% isocyanate groups, which forms a cross-linked structure upon room temperature curing and further cross-links with electron beam curing, creating a double network structure for enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyisocyanate is blended into electron beam curable coating composition to improve adhesion and curability, then adhesion and curability are improved, but it is still difficult to obtain cured film with both high breaking elongation and high tensile strength
Solution Approach 1:
The invention uses a composite curing system combining two different curable components: (A) electron beam curable component containing multifunctional (meth)acrylate and (B) room temperature curable component containing isocyanate group. This composite approach creates a dual-cured coating film that achieves both high adhesion and high mechanical properties, resolving the contradiction by leveraging the complementary strengths of different curing mechanisms rather than relying on a single additive approach
Solution Approach 2:
The invention changes the fundamental curing parameters by introducing a two-component system with different curing mechanisms (electron beam curing and room temperature curing). By controlling the mass ratio of component (B) to total components at 20-55%, the system achieves optimal balance between adhesion improvement and mechanical property enhancement, transforming the single-parameter approach into a multi-parameter optimization strategy
2Productivity
If conventional electron beam curable coating composition is used, then curing speed and energy efficiency are improved, but the cured film cannot achieve both high breaking elongation and high tensile strength
Solution Approach 1:
The room temperature curable component (B) performs preliminary curing action at room temperature before electron beam irradiation, creating a base cured film structure. This preliminary action allows the coating to develop initial adhesion and film formation, which then serves as a foundation for the subsequent electron beam curing process to enhance mechanical properties without sacrificing curing speed
Solution Approach 2:
The invention implements continuous useful action through sequential curing: first room temperature curing of component (B), then electron beam curing of component (A). This continuous process maintains productivity by eliminating idle time between steps and ensures both adhesion and mechanical strength are achieved through the combined effect of both curing stages
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 resulting cured film exhibits both high breaking elongation and tensile strength, as evidenced by a higher S-value, making it suitable for applications requiring durability and resistance to deformation.
Implementation Method 1
irradiating it with electron beams to cure the layers composed of the electron beam curable coating composition
Implementation Method 2
an electron beam curable component (A) which contains 10% by mass or more of a multifunctional (meth)acrylate
Implementation Method 3
a room temperature curable component (B) which contains 1 to 15% by mass of an isocyanate group and is not cured by electron beam irradiation
Data Source
AI summary
The present invention provides an electron beam curable coating composition comprising: an electron beam curable component (A) which contains 10% by mass or more of a multifunctional (meth)acrylate; and a room temperature curable component (B) which contains 1 to 15% by mass of an isocyanate group and is not cured by electron beam irradiation, wherein a solid content mass ratio of the component (B) to a total amount of the components (A) and (B) is 20 to 55% by mass.