Thermosetting Coating Sheets for Vacuum Forming and Wear Resistance
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Solution Overview
Problem
Existing thermosetting sheets for coating exhibit poor shape conformability and rupture when vacuum-forming large parts due to deflection at the center, compromising both vacuum formability and wear resistance.
Innovation Solution
A coating sheet comprising a transfer layer and a coating layer with specific indentation modulus and tensile elongation ranges, formulated with a thermosetting resin composition including (meth)acrylic resin and blocked isocyanate, allowing for enhanced flexibility and hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the decorative film is made flexible to improve vacuum formability, then shape conformability improves, but hardness and wear resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight of acrylic resin within 100,000 to 1,000,000 and adjusting the glass transition temperature to below 90°C. These parameter optimizations enable the coating film to achieve both flexibility for vacuum formability and sufficient hardness for wear resistance, resolving the contradiction between softness and hardness.
Solution Approach 2:
The patent uses composite materials by combining acrylic resin with specific functional groups, blocked isocyanate cross-linking agents, and optional inorganic fillers. This composite formulation creates a coating layer that exhibits both the flexibility needed for vacuum forming and the hardness required for wear resistance, simultaneously satisfying both contradictory requirements.
2Strength
If the thermosetting sheet is made rigid to improve wear resistance, then hardness improves, but vacuum formability deteriorates due to deflection and poor shape conformability
Solution Approach 1:
The patent resolves this contradiction by changing the physical and chemical parameters of the acrylic resin, specifically setting the weight-average molecular weight between 100,000 and 1,000,000 and the glass transition temperature below 90°C. These parameter adjustments allow the coating to maintain flexibility during vacuum forming while achieving adequate hardness for wear resistance after curing.
Solution Approach 2:
The patent applies local quality by creating different functional zones within the coating system: the uncured coating layer provides flexibility for vacuum forming, while the cured coating layer provides hardness for wear resistance. The blocked isocyanate cross-linking agent enables this spatial differentiation of properties through controlled curing.
3Ease of operation
If the coating layer is made soft to improve flexibility, then vacuum formability improves, but hardness and wear resistance deteriorate
Solution Approach 1:
The patent resolves this contradiction through precise parameter control of the acrylic resin, setting the weight-average molecular weight between 100,000 and 1,000,000 and the glass transition temperature below 90°C. These parameters enable the coating to exhibit appropriate flexibility for vacuum forming while maintaining sufficient hardness for wear resistance.
Solution Approach 2:
The patent applies dynamics by creating a time-dependent material behavior: the coating layer is soft and flexible during the vacuum forming process, then becomes hard and wear-resistant after thermal curing. The blocked isocyanate cross-linking agent enables this dynamic transformation from flexible to rigid state.
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 sheet achieves excellent vacuum formability and wear resistance, ensuring conformability to complex shapes without rupture and maintaining high hardness post-curing.
Implementation Method 1
a monomer that has a plurality of functional groups as cross-linking agents reacting with isocyanate groups; and a blocked isocyanate
Implementation Method 2
the indentation modulus of the coating layer obtained by nanoindentation method upon thermally curing at 160°C for 1 hour
Data Source
Figure 1~4
AI summary
The coating sheet of the present invention includes a transfer layer and a coating layer composed of a thermosetting resin composition, wherein the indentation modulus of the coating layer obtained by the nanoindentation method upon thermally curing at 160°C for 1 hour is 2.0 GPa or more and 3.5 GPa or less, and the tensile elongations at break in MD and TD at 100°C are 70% or more and 1,500% or less. The present invention can provide a coating sheet that has excellent vacuum formability and wear resistance.