Waterborne Coating Adhesion via Polytrimethylene Ether Polyol
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Solution Overview
Problem
Adhesion between coating layers, particularly between primer and basecoat layers, is a challenge in the coating industry, with existing technologies failing to provide consistent and durable inter-layer bonding.
Innovation Solution
A coating composition comprising a hydrophobic polytrimethylene ether polyol with crosslinkable functional hydroxyl groups and a waterborne binder component, combined with a crosslinking component in subsequent layers, to form a multi-layer coating structure that enhances adhesion without self-crosslinking, using a process that applies these layers sequentially or simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a waterborne coating composition is used, then environmental compatibility and ease of application are improved, but adhesion between coating layers deteriorates
Solution Approach 1:
The patent introduces a polyether polyol with hydroxyl groups as an intermediary substance in the waterborne coating composition. This polyol acts as a mediator that enhances adhesion between waterborne coating layers without compromising environmental compatibility. The hydroxyl groups form hydrogen bonds with subsequent coating layers, while the polyether structure maintains water solubility and eco-friendliness.
Solution Approach 2:
The patent modifies the chemical parameters of the waterborne coating by incorporating polyols with specific molecular weights (200-2000 g/mol) and hydroxyl numbers (10-225 mg KOH/g). These parameter changes enable the coating to achieve both environmental compatibility and improved inter-layer adhesion through controlled molecular interactions.
2Strength
If crosslinking functional groups are added to form a crosslinked structure, then adhesion and durability are improved, but coating flexibility and ease of application deteriorate
Solution Approach 1:
The patent applies partial crosslinking by incorporating polyols with moderate hydroxyl group content rather than full crosslinking. This partial action provides sufficient adhesion and durability enhancement while maintaining coating flexibility and ease of application. The controlled level of crosslinking prevents excessive rigidity.
Solution Approach 2:
The patent carefully controls the concentration and molecular weight parameters of the polyol components to achieve optimal balance. By adjusting these parameters, the coating achieves adequate crosslinking for durability while maintaining flexibility and workability during application.
3Strength
If hydrophobic polytrimethylene ether polyol is used, then adhesion to subsequent layers is improved, but water solubility and ease of formulation deteriorate
Solution Approach 1:
The patent uses composite material strategy by combining hydrophobic polytrimethylene ether polyol with hydrophilic waterborne binder components. This composite approach creates a dual-character system where the polyol provides adhesion through its hydrophobic segments while the hydrophilic binder matrix maintains water solubility and ease of formulation.
Solution Approach 2:
The patent applies local quality principle by having different regions of the coating composition serve different functions. The polytrimethylene ether polyol segments provide localized adhesion properties at the interface with subsequent layers, while the overall waterborne formulation maintains bulk water solubility for ease of manufacture and application.
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 improved inter-layer adhesion and increased flexibility of coating layers, particularly when the subsequent layer contains crosslinking functional groups that react with the hydroxyl groups, resulting in a durable and cohesive multi-layer coating.
Implementation Method 1
a polytrimethylene ether polyol having one or more crosslinkable functional hydroxyl groups
Implementation Method 2
crosslinking functional groups that react with said crosslinkable functional hydroxyl groups to form a crosslinked structure
Implementation Method 3
wherein said polytrimethylene ether polyol is hydrophobic
Implementation Method 4
a coating binder component comprising one or more film forming polymers
Data Source
AI summary
A coating composition having excellent adhesion between coating layers is provided. This disclosure is particularly directed to a 1K waterborne coating composition having hydrophobic polytrimethylene ether polyol containing crosslinkable functional hydroxyl groups. The 1K waterborne coating composition can be used in a multi-layer coating that can comprise a primer layer, a basecoat layer, and optionally, a clearcoat layer. The 1K waterborne coating composition of this disclosure can provide improved adhesion between coating layers, such as between a primer layer and a basecoat layer, between two or more basecoat layers, or between a basecoat layer and a clearcoat layer. This disclosure is further directed to a coating composition comprising components derived from renewable resources.