Primerless Base Coat for Polyolefin Adhesion
Find Innovative SolutionsGenerate Solutions
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 typically incorporated into base coats due to solvent incompatibility with color additives.
Innovation Solution
A base coat formulation that combines chlorinated polyolefins, color imparting additives, and coating resins without a primer, using distinct solvents for each component, allowing direct application to polymeric substrates and curing to form a stable, protective coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer layer is deposited on polymeric substrates to improve adhesion, then adhesion of the base coat is improved, but the painting process time and cost increase
Solution Approach 1:
The patent combines the adhesion promoter (chlorinated polyolefin) and color additives into a single base coat formulation, eliminating the need for a separate primer layer. The base coat now performs both the adhesion function and the coloration function simultaneously, reducing the number of painting steps while maintaining reliable adhesion to polymeric substrates.
Solution Approach 2:
The base coat formulation is designed to perform multiple functions: it provides adhesion to the polymeric substrate through chlorinated polyolefin, imparts color through color additives, and offers protection. This multi-functional approach eliminates the need for separate primer and base coat applications, reducing process time and cost.
2Reliability
If multiple layers are applied to achieve desired coating properties, then coating performance is improved, but the complexity and cost of the painting process increase
Solution Approach 1:
The patent merges multiple coating functions into a single base coat layer. The formulation includes adhesion promoters, color additives, and protective components all in one application, eliminating the need for multiple separate layers and simplifying the painting process while maintaining coating performance.
Solution Approach 2:
The base coat is designed as a universal coating that simultaneously achieves adhesion, coloration, and protection. This single-layer multi-functional approach reduces process complexity and cost while delivering the desired coating performance.
3Reliability
If chlorinated polyolefins are incorporated into base coats with color additives, then adhesion to polymeric substrates is improved, but solvent incompatibility issues arise
Solution Approach 1:
The patent uses a compatible solvent system as an intermediary to bridge the incompatibility between chlorinated polyolefins and color additives. The solvent selection ensures that all components remain stable and compatible within the base coat formulation, allowing adhesion promoters and color additives to coexist without separation or degradation.
Solution Approach 2:
The patent adjusts solvent parameters (type, concentration, composition) to achieve compatibility among all base coat components. By carefully selecting and optimizing the solvent system, the formulation maintains stability while incorporating both adhesion promoters and color additives in the desired concentrations.
Data Source
AI summary
Base coats, methods of using base coats, and methods of producing base coats 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 chlorinated polyolefin at from about 5 to about 20 weight percent, based on a total weight of the CPO intermediate, as well as a CPO solvent. 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, where the base coat includes from about 1 to about 3 weight percent chlorinated polyolefin and from about 5 to about 30 weight percent solids, based on a total weight of the base coat.