Hydroxy-Substituted Polyamine pH Adjustment in Coatings
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Solution Overview
Problem
Current polyamine compounds are not effectively utilized for pH adjustment in coating compositions, as existing references do not disclose hydroxy-substituted polyamine compounds suitable for this purpose.
Innovation Solution
A compound with the formula (I) is introduced, where R1 and R2 form a difunctional C2-C6 hydrocarbyl group, and X is a difunctional group selected from various hydrocarbyl, cyclohydrocarbyl, aryl, or heterohydrocarbyl groups, allowing for pH adjustment in coating compositions by adding the compound to achieve a final pH between 7.5 and 9.5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyamine compounds are used for pH adjustment, then the coating composition can achieve basic pH control, but the pH adjustment effectiveness is insufficient and the final pH cannot reach the desired range of 7.5 to 9.5
Solution Approach 1:
The patent modifies the chemical structure of polyamine compounds by introducing hydroxy substituents at specific positions (R1 and R2 form a difunctional C2-C6 hydrocarbyl group with hydroxy substitution). This structural parameter change enhances the basicity and pH adjustment capability of the compound, enabling it to effectively raise pH to the 7.5-9.5 range in coating compositions.
Solution Approach 2:
The invention creates a composite molecular structure combining polyamine backbone with hydroxy-substituted hydrocarbyl groups. This composite structure integrates the pH buffering capacity of polyamines with the enhanced basicity and solubility properties of hydroxy groups, achieving superior pH adjustment performance compared to conventional polyamines alone.
2Reliability
If existing polyamine compounds are used, then the formulation is simple, but the compound cannot effectively adjust pH in coating compositions to the desired range
Solution Approach 1:
The patent systematically varies parameters including the hydrocarbyl group type (aliphatic, cycloaliphatic, aromatic), the position and nature of hydroxy substitution, and the polyamine backbone structure. These controlled parameter changes optimize pH adjustment effectiveness while managing molecular complexity to maintain manufacturability and performance.
3Reliability
If conventional polyamines are used for pH adjustment, then no additional additives are needed, but the pH cannot be maintained in the optimal range for coating performance
Solution Approach 1:
The hydroxy-substituted polyamine compound serves multiple functions: it acts as a pH buffer, provides basicity to neutralize acidic components, and enhances coating performance through its unique molecular structure. This multi-functionality allows a single compound to replace multiple additives while maintaining pH stability across different coating formulations.
Solution Approach 2:
The patent optimizes the basicity parameter of the polyamine compound through hydroxy substitution, enabling it to effectively neutralize acidic components in coating compositions and maintain pH in the optimal 7.5-9.5 range. The modified basicity provides both pH adjustment and stabilization capabilities.
Data Source
AI summary
A compound having formula (I) wherein R1 is methyl or ethyl; R2 is hydrogen, methyl, CH2C(NH2)(R1)(CH2OH) or R2 groups combine to form a difunctional C2-C6 alkyl group; and X is a difunctional group selected from the group consisting of C2-C20 alkyl, C5-C20 cycloalkyl, C6-C10 aryl, C8-C20 aryl alkyl, C4-C20 heteroalkyl or C10-C20 aryl heteroalkyl.