Polyester Amine Dispersant for UV Resistance and Fluidity
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Solution Overview
Problem
Existing dispersants for particulate solids in organic media lack superior fluidity and resistance to UV discoloration, particularly in acid-catalyzed and epoxy coating processes.
Innovation Solution
Development of a dispersant formula (T-V-(A)m-U-Z-Wx) where T is a polymerization terminating group, V is a direct or divalent linking group, A is derived from hydroxy carboxylic acids or lactones, Z is a polyamine or polyimine, and W represents an oxide or urea, enhancing the dispersant's ability to stabilize particulate solids in both polar and non-polar media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyester amine dispersants are used, then basic dispersing function is provided, but fluidity and UV resistance are insufficient
Solution Approach 1:
The dispersant combines polyamine or polyimine core structures with polyester chains derived from hydroxy carboxylic acids or lactones, creating a composite molecular architecture that integrates multiple functional components for enhanced UV resistance and fluidity while maintaining dispersing capability
Solution Approach 2:
The invention modifies molecular parameters by controlling the degree of polymerization (m from 2 to 2000) and the extent of amino/imino group substitution (x from 1 to maximum available), allowing optimization of fluidity and UV resistance properties through systematic parameter variation
2Reliability
If amino and imino groups are reacted with oxygen or urea, then UV resistance improves, but molecular structure complexity increases
Solution Approach 1:
The reaction with oxygen or urea is applied selectively to amino and imino groups at specific locations in the molecular structure (indicated by Wx where x is from 1 to maximum available amino/imino groups), creating localized functional modifications that provide UV resistance without uniformly complicating the entire molecular structure
Solution Approach 2:
Urea or oxygen acts as an intermediary substance that reacts with amino and imino groups to form protective structures (urea linkages or oxidized nitrogen species) that enhance UV resistance, serving as a chemical mediator between the base dispersant structure and the desired photostability property
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 new dispersant formulation provides superior fluidity and resistance to UV discoloration, improving the stability and performance of pigment dispersions in various coating processes.
Implementation Method 1
dispersant of formula (1)... dispersing a particulate solid in an organic medium
Implementation Method 2
polymerisation terminating group... polyamine or polyimine... providing superior fluidity
Data Source
AI summary
The present invention provides a dispersant of formula (1): T-V-(A)n, -U-Z-W, Formula (1) wherein, T is a polymerization terminating group; V is a direct bond or divalent linking group; A is the residue of one or more different hydroxy carboxylic acids or lactones thereof, U is a direct bond or a divalent linkage; Z is the residue of a polyamine or polyimine; W is the residue of an oxide or urea; m is from 2 to 2000; and x is from 1 up to the maximum number of available amino and/or imino groups in Z which do not carry the group T-V-(A)n, -U-.