Adhesion Promotion Additives for Low-Temperature Coating Curing
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Solution Overview
Problem
Current coating compositions for automotive window applications lack effective adhesion promotion additives that enhance adhesion strength, abrasion resistance, and water resistance, often requiring high-temperature firing steps and multiple handling processes, which can degrade materials and complicate the coating process.
Innovation Solution
A coating composition incorporating a resin, such as epoxy, acrylic, or polyurethane, with an adhesion promotion additive containing terminal unsaturation and silylated groups, along with a compound featuring an acid moiety, which can be cured through free radical reactions, eliminating the need for high-temperature firing and simplifying the application process while providing improved bond strength and weatherability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-temperature firing steps are used to improve adhesion strength and durability, then bond strength is improved, but material degradation and process complexity increase
Solution Approach 1:
The patent changes the curing parameter from high-temperature firing (>600°C) to low-temperature free radical curing (ambient to moderate temperatures), thereby achieving strong adhesion without material degradation. The adhesion promotion additive enables this parameter change by providing a chemical mechanism that works at lower temperatures.
Solution Approach 2:
The patent replaces the thermal-mechanical firing process with a chemical free radical reaction process. Instead of relying on high heat to create adhesion, the system uses free radical-initiated bonding mechanisms that occur at lower temperatures, substituting a chemical system for a thermal-mechanical one.
2Strength
If high-temperature firing steps are used to improve adhesion strength, then bond strength is improved, but process complexity and handling requirements increase
Solution Approach 1:
The curing temperature parameter is changed from high (>600°C) to low (ambient to moderate), which simplifies the equipment and handling requirements. This parameter change eliminates the need for specialized high-temperature furnaces and complex thermal management procedures.
Solution Approach 2:
The patent extracts the high-temperature firing step from the coating process, removing the source of complexity. By using adhesion promotion additives that cure at lower temperatures, the problematic high-temperature step is completely eliminated, simplifying the overall process.
3Strength
If multiple handling processes are used to achieve durable coating, then adhesion strength is improved, but productivity decreases
Solution Approach 1:
The patent combines adhesion promotion and coating application into a single integrated step. The adhesion promotion additive is incorporated into the coating composition itself, so that applying the coating and achieving adhesion promotion occur simultaneously, eliminating separate handling steps.
Solution Approach 2:
The adhesion promotion capability is prepared in advance by incorporating the additive into the coating composition during manufacturing. This preliminary preparation ensures that adhesion promotion is already built into the coating, eliminating the need for separate adhesion treatment steps during application.
4Strength
If two-component coating compositions are used to achieve adhesion promotion, then adhesion strength is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent merges the adhesion promoter and coating composition into a single integrated product. The adhesion promotion additive is pre-combined with the coating resin and other ingredients, creating a one-component system that is easier to apply and handle while maintaining strong adhesion performance.
Solution Approach 2:
The coating composition is designed to perform multiple functions in a single formulation: it provides both the coating film and adhesion promotion capabilities. The adhesion promotion additive enables the coating to bond effectively without requiring a separate adhesion promoter component.
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 results in a durable, long-term coating with enhanced bond strength, abrasion resistance, and water resistance, capable of being applied as a one-component system, avoiding the need for intermediate layers and high-temperature processing, thus simplifying the application and improving the coating's performance on transparent substrates like glass and plastic.
Implementation Method 1
a coating composition (and particularly a printing ink composition) that includes at least one resin selected from an epoxy, an acrylic, a polyurethane, polyacrylate, or any combination thereof, a colorant, an adhesion promotion additive, such as one including at least one terminal unsaturation and one or more silylated groups; and a compound including an acid moiety... Desirably the composition is one that is cured by a free radical reaction, such as one initiated by heat, radiation, or a combination of heat and radiation.
Implementation Method 2
an adhesion promotion additive, such as one including at least one terminal unsaturation and one or more silylated groups
Implementation Method 3
a compound including an acid moiety, such as from a carboxylic acid, a phosphonic acid, a sulfonic acid, a mercapto acid or a combination thereof
Data Source
AI summary
An additive (and methods for a coating composition that includes at least one an agent for improving the performance of the coating composition, selected from a Michael addition product of siloxane further containing one or more active hydrogen containing functional moieties with two or more acrylate groups; a high molecular weight adduct having multiple alkoxysilane moieties; a compound including at least one terminal unsaturation and multiple alkoxysilyl groups; an organometallic compound that includes an element selected from silicon, titanium, zirconium, aluminum, or any combination thereof.