Base Coat Formulation for Polyolefin Adhesion
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Solution Overview
Problem
The existing painting process for motor vehicle components, particularly those made of thermoplastic polyolefins and polypropylene, requires multiple layers including a primer for adhesion, which is time-consuming and costly, and chlorinated polyolefins are not easily incorporated into base coats due to solvent incompatibility with pigments and resins.
Innovation Solution
A base coat is formulated by combining a CPO intermediate with a chlorinated polyolefin and a color intermediate containing a color imparting additive, using solvents that are compatible with both, allowing direct application to polymeric substrates without a primer layer, with the chlorinated polyolefin present at 1-3 weight percent and solids at 25-50 weight percent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer layer is deposited directly on polymeric substrates to improve adhesion, then adhesion of the base coat is improved, but the number of layers increases leading to greater time and cost
Solution Approach 1:
The invention combines the adhesion promoter (chlorinated polyolefin) and color imparting additives into a single base coat formulation. This merging eliminates the need for a separate primer layer, reducing the number of painting steps while maintaining adhesion to polymeric substrates like thermoplastic polyolefins and polypropylene.
Solution Approach 2:
The base coat is designed to perform multiple functions simultaneously: it provides color, maintains adhesion to difficult-to-coat polymeric substrates through the chlorinated polyolefin, and offers protection. This multi-functionality replaces the traditional primer layer's adhesion function, eliminating an entire process step.
2Reliability
If multiple layers including primer are used to coat polymeric substrates, then adhesion and protection are improved, but the complexity of the coating process increases
Solution Approach 1:
The invention merges the adhesion promoter and color additives into a single base coat formulation, eliminating the need for separate primer and base coat applications. This reduces process complexity from multiple sequential steps to a single coating operation.
Solution Approach 2:
The base coat formulation achieves multiple functions (adhesion, color, protection) in one layer, replacing the traditional multi-layer system. This universality simplifies the coating process while maintaining all necessary performance characteristics.
3Adaptability or versatility
If chlorinated polyolefins are incorporated into base coats, then direct application to polymeric substrates is enabled, but solvent incompatibility with pigments and resins occurs
Solution Approach 1:
The invention changes the solvent parameters by using a mixed solvent system comprising both polar and non-polar solvents. This parameter adjustment allows the chlorinated polyolefin (non-polar) to remain compatible with polar pigments and resins, enabling direct application to polymeric substrates without phase separation or instability.
Solution Approach 2:
The base coat uses a composite solvent system combining different types of solvents (polar and non-polar) to achieve compatibility with all components including chlorinated polyolefin, pigments, and resins. This composite approach resolves the solvent incompatibility issue while maintaining formulation stability.
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
This approach enables stable, direct application of a base coat to polymeric substrates, improving adhesion and protection while reducing the number of layers needed, thus saving time and cost in the painting process.
Implementation Method 1
The base coat includes a solvent system comprising a CPO solvent and a color solvent, where the color solvent is different than the CPO solvent. The CPO intermediate includes a CPO solvent and a chlorinated polyolefin... The color intermediate includes a color imparting additive and a color solvent that is different than the CPO solvent.
Data Source
AI summary
Base coats and methods of producing the same are provided. In an exemplary embodiment, a method of producing a base coat includes forming a CPO intermediate and a color intermediate. The CPO intermediate includes a CPO solvent and a chlorinated polyolefin, where the chlorinated polyolefin is present in the CPO intermediate at from about 5 to about 20 weight percent, based on a total weight of the CPO intermediate. The color intermediate includes a color imparting additive and a color solvent that is different than the CPO solvent. The CPO intermediate and the color intermediate are combined to form the base coat.