Oxygen-Absorbing Polymer for Oxygen-Inhibited Coating Curing
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Solution Overview
Problem
The use of (meth)acrylic acid esters as reactive diluents in coating materials inhibits polymerization curing reactions due to oxygen presence, leading to slow curing and sticky surfaces, which conventional radical polymerizable resins like unsaturated polyester resins face, especially when applied in air atmospheres.
Innovation Solution
A polymer comprising a structural unit derived from a specific unsaturated double bond-comprising compound, which effectively absorbs oxygen and enhances crosslinking reactions, allowing for sufficient polymerization and curing even in air atmospheres, along with an oxygen absorbent and a resin composition that includes this polymer, ensuring excellent curability and appearance of the cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If (meth)acrylic acid esters are used as reactive diluents to replace styrene for environmental protection, then environmental compatibility is improved, but polymerization curing reaction is more inhibited by oxygen leading to reduced curability
Solution Approach 1:
The patent introduces a specific polymer as an intermediary substance that mediates between the (meth)acrylic acid ester resin and oxygen. This polymer contains a carbon-carbon double bond that preferentially reacts with oxygen, acting as a sacrificial mediator that protects the main resin system from oxygen inhibition while maintaining environmental compatibility
Solution Approach 2:
The patent modifies the chemical composition parameters of the resin system by incorporating a specific polymer at controlled concentrations (0.01-10 wt%). This parameter change alters the oxygen reactivity profile of the system, enabling sufficient curability in air atmosphere while maintaining the use of environmentally friendly (meth)acrylic acid esters
2Ease of operation
If conventional radical polymerizable resins are polymerized in air atmosphere, then ease of operation is improved, but polymerization reaction is inhibited by oxygen causing slow curing and sticky surface
Solution Approach 1:
The patent applies preliminary action by pre-incorporating the oxygen-reactive polymer into the resin composition before application. This polymer is already positioned to intercept oxygen molecules as they diffuse into the coating, preventing oxygen inhibition before it can affect the main polymerization reaction, thus enabling fast curing in air atmosphere
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 polymer composition ensures excellent curability and formation of a cured product with excellent appearance by effectively absorbing oxygen and promoting crosslinking reactions, even in the presence of oxygen, thereby preventing slow curing and surface stickiness.
Implementation Method 1
a polymer comprising a structural unit derived from a compound (A) represented by formula (I)... which effectively absorbs oxygen
Implementation Method 2
the effective absorbance of oxygen by the carbon-carbon double bond in the structural unit derived from the compound (A) during the curing process
Implementation Method 3
enhances crosslinking reactions, allowing for sufficient polymerization and curing
Data Source
AI summary
A polymer comprising a structural unit derived from a compound (A) represented by formula (I): wherein X, Y, R1, R2, R7, R8, R3, R4, R5, R6, J, and n are as defined in the description, provides a resin composition that has an excellent curability and sufficiently polymerizes for curing even in the presence of oxygen in an air atmosphere to form a cured product having excellent appearance.