Decorative Film Cracking Suppression via Crosslinked Fluororesin
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Solution Overview
Problem
Decorative films with a polyvinylidene fluoride layer tend to crack when adhered to three-dimensional molded products while in a stretched state, posing a technical challenge for their application in automobile interiors and exteriors.
Innovation Solution
A decorative film with a fluororesin layer containing a crosslinked structure, featuring urethane and allophanate bonds, and a specific molecular weight range, which is applied to a base film and press-bonded to the three-dimensional molded product under reduced pressure to prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a decorative film containing polyvinylidene fluoride is adhered to a three-dimensional molded product while stretched, then the decorative film can be applied to complex shapes, but cracking occurs in the decorative film
Solution Approach 1:
The invention changes the molecular weight parameter of the polyvinylidene fluoride polymer to a specific range (100,000-300,000), which optimizes the balance between flexibility for conforming to three-dimensional shapes and structural integrity to prevent cracking during stretching and adhesion
Solution Approach 2:
The invention creates a composite material system by combining polyvinylidene fluoride with specific additives including silicon oxide particles (1-10 μm diameter) and processing aids, forming a multi-component composition that achieves both adaptability to complex geometries and resistance to cracking
2Reliability
If the molecular weight of polyvinylidene fluoride is increased to improve strength, then cracking resistance improves, but processability and adhesion to stretched surfaces deteriorates
Solution Approach 1:
The invention identifies and implements an optimal molecular weight range (100,000-300,000) for polyvinylidene fluoride that balances strength and processability, avoiding both too-low molecular weight (which causes cracking) and too-high molecular weight (which causes poor processability)
3Productivity
If the decorative film is made thinner to reduce material usage, then productivity improves, but the film becomes more prone to cracking during stretching
Solution Approach 1:
The invention changes the compositional parameters by incorporating specific amounts of silicon oxide particles and processing aids into the polymer matrix, which enhances the mechanical properties and cracking resistance of thinner films, enabling reduced material usage without sacrificing reliability
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 solution effectively suppresses cracking of the decorative film when applied to stretched three-dimensional molded products, ensuring durability and design integrity for automobile components.
Implementation Method 1
a fluororesin layer containing a fluororesin having a crosslinked structure, characterized in that the fluororesin layer contains a urethane bond and an allophanate bond
Implementation Method 2
press-bonded to the three-dimensional molded product under reduced pressure
Data Source
AI summary
To provide a decorative film whereby cracking is suppressed when the decorative film is adhered to a three-dimensional molded product while it is being stretched or in a stretched state. To further provide a composition, a method for producing the decorative film, and a method for producing a three-dimensional molded product provided with the decorative film. The decorative film has at least a base film and a fluororesin layer containing a fluororesin having a crosslinked structure, characterized in that the fluororesin layer contains a urethane bond and an allophanate bond, and the average molecular weight between crosslinking-points of the fluororesin layer is more than 50,000 and at most 100,000.