Malonate Ester Coatings for Spontaneous Substrate Adhesion
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Solution Overview
Problem
Existing coatings and adhesives face challenges in adhering to substrates, especially contaminated ones like oil-coated surfaces, and require initiators for polymerization, which limits their application efficiency.
Innovation Solution
A dicarbonyl compound-based composition that can spontaneously polymerize at room temperature without an initiator, allowing for immediate or delayed polymerization and adhesion to substrates, including contaminated ones, through contact and penetration, and can be applied using various methods like spray coating or brushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing coatings are used to adhere to substrates, then adhesion can be achieved, but they require initiators for polymerization and cannot effectively adhere to contaminated substrates like oil-coated surfaces
Solution Approach 1:
The patent extracts and removes the initiator requirement from the coating system by using malonate esters that undergo spontaneous polymerization through contact with nucleophilic substrates. This eliminates the need for separate initiator substances, simplifying the application process while maintaining reliable adhesion to challenging substrates including contaminated surfaces.
Solution Approach 2:
The coating composition performs self-service by automatically polymerizing upon contact with substrates having pH greater than 7 or nucleophilic groups. The malonate ester molecules self-assemble and polymerize without external initiation, enabling the coating to adhere to substrates autonomously without requiring additional chemicals or complex activation procedures.
2Productivity
If coatings polymerize immediately upon application, then adhesion occurs rapidly, but control over polymerization timing is lost and application flexibility is reduced
Solution Approach 1:
The coating is applied in an unpolymerized state to the substrate surface first, allowing for proper positioning, spreading, and coverage before polymerization begins. The malonate ester composition maintains its liquid or paste form during application, then polymerizes after contact with the substrate, ensuring both rapid final adhesion and controlled application timing.
Solution Approach 2:
The polymerization timing is made dynamic and adaptable to different substrates. The rate of polymerization varies based on substrate properties such as pH and nucleophilicity, allowing the coating to optimize its curing speed for each specific application while maintaining ease of handling during the application window.
3Ease of operation
If viscosity is reduced for easier application, then coating can be applied more easily, but the composition may polymerize too quickly or lose control over the coating process
Solution Approach 1:
The patent optimizes the viscosity parameter of the malonate ester composition to fall within the range of 50-5000 cP at room temperature. This parameter change enables the coating to remain fluid enough for easy application through various methods while simultaneously maintaining sufficient stability to prevent premature polymerization and allow controlled processing.
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 composition enables effective adhesion and polymerization on challenging substrates, improving dimensional stability, weldability, and handling properties of materials, while allowing for recyclable and tack-free surfaces, and can be used on a variety of substrates including metals and polycarbonate materials.
Implementation Method 1
spontaneous polymerization (e.g., in less than about one minute) at room temperature of the composition without the addition of an initiator
Implementation Method 2
assists in adhering the coated material to a substrate (e.g., by permitting penetration of the material through the coating to the substrate)
Data Source
AI summary
The present teachings contemplate a method comprising coating an polymeric material with a composition including a dicarbonyl compound and having a viscosity of from about 50 cps to about 500 cps, wherein the coating initiates either: (i) spontaneous polymerization (e.g., in less than about one minute) at room temperature of the composition without the addition of an initiator; or (ii) polymerization at room temperature at a selected later time with or without the addition of an initiator; and wherein the composition adheres or facilitates adhesion of the polymeric material to a substrate.