Deformable Film Coating for Uniform Matte Finish
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing decorative films for plastic materials in automobile interiors face issues with maintaining a uniform matte finish, experiencing gloss variations, microcracks, and high emissions due to stretching, which leads to undesirable surface defects and non-compliance with market requirements.
Innovation Solution
An embossed, deformable film with a coating comprising an aqueous dispersion of hydroxy-functional prepolymer and nanoparticles, specifically designed to provide consistent matte finish and low emissions, using a hydroxy-functional prepolymer and nanoparticles with controlled particle size and reactive groups, along with a crosslinker to ensure uniformity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the decorative surface is stretched during deep drawing, then the component shape is formed, but the lacquer in grain valleys tears causing gloss spots and graying
Solution Approach 1:
The patent modifies the chemical composition parameters of the lacquer by incorporating specific polymers with controlled molecular weights, plasticizers in optimized ratios, and crosslinking agents. These parameter changes enhance the lacquer's elongation properties and flexibility, allowing it to withstand the stretching stresses during deep drawing without tearing or forming defects in grain valleys.
Solution Approach 2:
The lacquer is formulated as a composite material system combining multiple polymer types (polyester, polyacrylic, polyvinyl chloride), plasticizers, crosslinking agents, and matting agents. This composite structure provides both the flexibility needed for deep drawing and the durability required to maintain surface integrity, preventing tear formation and gloss spots during forming operations.
2Illumination intensity
If conventional lacquers are used to achieve deep matt finish, then initial surface appearance is good, but emissions are too high and uniformity is lost during stretching
Solution Approach 1:
The patent changes the chemical parameters of the lacquer formulation by using water-based systems with specific polymer compositions, controlled plasticizer ratios, and crosslinking mechanisms. These parameter modifications reduce volatile organic compound emissions while maintaining the deep matt finish appearance and ensuring uniformity is preserved during the stretching and deep drawing processes.
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 achieves a consistent matte finish across the film, reduces emissions, and prevents microcracks, meeting market requirements by ensuring the decorative surface remains matte and neutral in color without graying or color drift, even after deep-drawing processes.
Implementation Method 1
The primer acts as a bonding agent between the substrate, which forms the decorative surface, and the overlying coating layers
Implementation Method 2
a crosslinker which has at least two groups reactive towards hydroxyl groups
Implementation Method 3
nanoparticles with a number-average particle size measured by laser correlation spectroscopy of 5 to 100 nm
Data Source
AI summary
The invention relates to a deformable film having a decorative surface featuring a completely matt appearance. For this purpose, the deformable film has a decorative surface provided with at least one coating comprising the following constituents: a) an aqueous dispersion of a hydroxy-functional prepolymer, obtainable by conversion of at least one of the following components: i) a component having hydroxyl groups, ii) a polyester polyol having hydroxyl groups, iii) a polyisocyanate having isocyanate groups, iv) a compound having at least two groups reactive toward isocyanate groups and at least one group capable of anion formation, v) water, where components i) to iii) and the ratio of components i) to iii) is selected such that an excess of hydroxyl groups is present relative to the isocyanate groups, and b) nanoparticles having a number-average particle size of 1 to 1000 nm and c) a crosslinker having at least two groups reactive toward hydroxyl groups.