Sealer Composition for Coating Film Appearance Quality
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Solution Overview
Problem
Conventional sealer compositions for vehicle coatings, particularly in the region from the lower part of the rear door to the upper part of the seal side, suffer from rough surface texture and unevenness, leading to poor appearance quality and vulnerability to external impacts such as chipping.
Innovation Solution
A sealer composition comprising a polyol mixture of polyester and polyether polyols, a blocked isocyanate compound, a curing catalyst, a filler, and a solvent, along with optional additives like defoaming agents and colorants, which improves the coating film's surface quality and resistance to external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVC RPP is applied to improve rust resistance and protect the adherend surface, then the coating film provides protection, but the exterior surface becomes rough and uneven, deteriorating appearance quality
Solution Approach 1:
The invention uses a composite polymer composition containing thermoplastic polyolefin resin (50-80 wt%), elastomer (10-30 wt%), and inorganic filler (5-20 wt%). This composite structure combines the rust resistance of the polymer matrix with the surface-smoothing effect of the elastomer and filler, achieving both protection and appearance quality.
Solution Approach 2:
The invention changes the chemical composition parameters by selecting specific resin types (polyethylene, polypropylene, etc.), elastomer types (ethylene-propylene rubber, butyl rubber, etc.), and filler types (calcium carbonate, silica, etc.). By adjusting the ratios and selecting specific materials within defined ranges, the composition achieves optimal balance between rust resistance and surface smoothness.
2Manufacturing precision
If polyurethane-based sealer is applied to secure watertightness and fill gaps, then external surface quality improves, but the coating film becomes vulnerable to external impact and chipping
Solution Approach 1:
The composite structure combines rigid thermoplastic polyolefin resin for strength and impact resistance with flexible elastomer for toughness. The inorganic filler enhances hardness and chip resistance. This multi-component composite achieves both surface quality and impact resistance that single materials cannot provide.
Solution Approach 2:
The invention applies different functional components in specific proportions: the polyolefin resin (50-80 wt%) provides the base structure and impact resistance, the elastomer (10-30 wt%) provides flexibility and surface smoothness, and the inorganic filler (5-20 wt%) provides hardness and chip resistance. Each component contributes locally to different properties, achieving overall optimization.
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 sealer composition enhances the external surface quality and abrasion resistance of the coating film, reducing costs by replacing conventional anti-chipping films and improving process efficiency.
Implementation Method 1
a polyol mixture including a polyester polyol and a polyether polyol, an isocyanate compound including a blocked isocyanate
Data Source
AI summary
Disclosed are a sealer composition and a coating film with improved appearance quality. The sealer composition for a coating film includes a polyol mixture containing a polyester polyol and a polyether polyol in a predetermined ratio, an isocyanate compound including a blocked isocyanate, and a curing catalyst and the coating film prepared from the sealer composition has improved appearance quality as well as improved abrasion resistance.