Manganese Salen Curing Accelerator for Oxidative Resins
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Solution Overview
Problem
Current curing accelerators for oxidative polymerization-type unsaturated resins either rely on carcinogenic cobalt compounds, are costly, or result in prolonged drying times, and lack versatility for use in general-purpose printing inks and coatings.
Innovation Solution
A mixture of a fatty acid manganese salt and a salen-based compound, which is highly soluble in organic solvents, is used to accelerate curing while preventing wrinkling and shrinkage, offering improved performance comparable to cobalt metallic soaps without the use of cobalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cobalt metallic soap is used as a curing accelerator, then drying performance is improved, but carcinogenicity and cost increase
Solution Approach 1:
The patent replaces expensive and harmful cobalt metallic soap with a combination of manganese metallic soap and bipyridyl compound. This substitution uses cheaper, non-carcinogenic materials to achieve the same curing accelerator function, eliminating the harmful effects while maintaining productivity.
Solution Approach 2:
The patent introduces bipyridyl compound as an intermediary that works synergistically with manganese metallic soap to achieve cobalt-level drying performance. The bipyridyl compound mediates the catalytic activity, allowing manganese (a safe and cheap metal) to perform the function previously exclusive to cobalt.
2Productivity
If large amount of cobalt metallic soap is used to improve drying performance, then surface drying rate increases, but wrinkling and shrinkage occur
Solution Approach 1:
The patent changes the chemical parameters of the curing accelerator system by using manganese metallic soap combined with bipyridyl compound instead of cobalt metallic soap. This parameter change allows achieving high surface drying rate without the excessive reactivity that causes wrinkling and shrinkage.
Solution Approach 2:
The patent creates a composite curing accelerator system combining manganese metallic soap and bipyridyl compound. This composite approach balances the reactivity to achieve fast drying while preventing surface defects, overcoming the limitations of single-component systems.
3Object-affected harmful factors
If manganese metallic soap and bipyridyl combination is used to avoid cobalt, then carcinogenicity is reduced, but drying time increases
Solution Approach 1:
The patent optimizes the dynamic interaction between manganese metallic soap and bipyridyl compound to achieve fast curing kinetics. The bipyridyl compound enhances the catalytic activity of manganese, making the drying process as fast as cobalt-based systems while maintaining safety advantages.
Solution Approach 2:
The patent adjusts the stoichiometric ratio and chemical structure parameters of the manganese-bipyridyl system to maximize drying speed. By optimizing these parameters, the system achieves practical drying times comparable to cobalt metallic soap while eliminating carcinogenicity.
4Productivity
If tetradentate ligand complex is used for phenolic compounds, then curability is improved, but versatility decreases due to limited solubility and phenol requirement
Solution Approach 1:
The patent creates a universal curing accelerator system using manganese metallic soap and bipyridyl compound that works with various resin types including polyesters, acrylics, and vinyls. This system replaces the phenol-specific tetradentate ligand complex, expanding applicability to general-purpose printing inks and coating materials.
Solution Approach 2:
The patent uses bipyridyl compound as a versatile intermediary that forms soluble complexes with manganese and works across different resin systems. This intermediary approach eliminates the need for phenolic compounds while maintaining high curability, achieving both speed and versatility.
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 provides a fast curing time, high curing performance, and versatility for outdoor use, addressing the concerns of carcinogenicity and cost associated with cobalt compounds, while ensuring solubility in common solvents and preventing surface defects.
Implementation Method 1
a curing accelerator containing a fatty acid manganese salt (A) and a compound (B) represented by general formula (1)... accelerate curing while preventing wrinkling and shrinkage
Implementation Method 2
oxidative polymerization-type unsaturated resin... oxidative polymerization drying-type printing inks and coating materials
Data Source
AI summary
There is provided a highly versatile curing accelerator for an oxidative polymerization-type unsaturated resin that is highly soluble in organic solvents, can be used outdoors, and has a curing performance equal to or higher than the curing performance of cobalt metallic soaps, which are feared to have an influence on the human body, without the use of any cobalt metallic soap. There are also provided a printing ink and a coating material that use the above curing accelerator. Specifically, the curing accelerator for an oxidative polymerization-type unsaturated resin that is used contains a fatty acid manganese salt (A) and a compound (B) represented by formula (1) below, (wherein R1 and R4 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, or an amino group, R2 and R5 are each a hydrogen atom, a hydrocarbon group, a hydrocarbonoxy group, a hydrocarbonoxycarbonyl group, a cyano group, a nitro group, or a halogen atom, R3 and R6 are each a hydrogen atom or a hydrocarbon group, and R7 is a divalent hydrocarbon group, and wherein R1 and R2 may form a ring, and and R5 may form a ring).