Sulfonate Diol Mixture for Polyurethane Resin Solubility
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Solution Overview
Problem
Conventional sulfonic acid diols used in polyurethane resins for magnetic recording media are poorly soluble in organic solvents, leading to nonuniform distribution of sulfonic acid groups, which affects dispersion and stability, and their storage stability in organic solvents is inadequate.
Innovation Solution
A sulfonate group-containing compound with a protonic acid is used, forming a mixture that enhances solubility and storage stability in organic solvents, allowing for uniform distribution of sulfonic acid groups in polyurethane resins, thereby improving the polyurethane's performance as a binder in magnetic recording media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfonic acid diols are used in polyurethane resins, then the sulfonic acid groups can be incorporated into the binder, but the solubility in organic solvents is poor and the storage stability is inadequate
Solution Approach 1:
The invention changes the chemical structure parameters of the sulfonic acid diol by introducing specific structural features (aromatic rings, ether bonds, hydroxyl groups at specific positions) to improve both solubility in organic solvents and storage stability simultaneously. The compound of formula (1) with specific R1, R2, and X groups achieves this balance through molecular design
Solution Approach 2:
The invention creates a composite molecular structure combining sulfonic acid groups with specific organic moieties (aromatic rings, ether bonds, hydroxyl groups) to achieve both good solubility in organic solvents and high storage stability. The composite structure of formula (1) integrates multiple functional groups that work synergistically
2Manufacturing precision
If polyester sulfonic acid polyols are used to incorporate sulfonic acid groups into polyurethane resins, then the sulfonic acid groups can be present in the binder, but the distribution is nonuniform and dispersion-enhancing effects are reduced
Solution Approach 1:
The invention changes from using polyester sulfonic acid polyols to using sulfonic acid diol monomers (formula (1)) as starting materials. This parameter change in the molecular structure and reactivity enables uniform incorporation of sulfonic acid groups throughout the polyurethane resin during polymerization, achieving both uniform distribution and good dispersion effects
Data Source
AI summary
An aspect of the present invention relates to a mixture of a sulfonate group-containing compound denoted by general formula (1) with a protonic acid:wherein, in general formula (1), X denotes a divalent linking group; each of R1 and R2 independently denotes an alkyl group comprising at least one hydroxyl group and equal to or more than three carbon atoms or an aralkyl group comprising at least one hydroxyl group and equal to or more than eight carbon atoms; and M denotes a cation.