Polyaddition Wetting Agent for Paint Settling
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Solution Overview
Problem
Conventional wetting and dispersing agents fail to combine dispersing and rheological properties effectively in aqueous and solvent-containing systems, leading to settling issues and loss of color strength or rub-out in paint formulations.
Innovation Solution
Amine-free polyaddition compounds and their salts, derived from epoxy resins and polyether alcohols, are developed to provide both dispersing and rheological properties, preventing settling and maintaining color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional wetting and dispersing agents are used, then pigments can be dispersed in liquid media, but the pigments tend to reagglomerate and settle due to lack of rheological properties
Solution Approach 1:
The patent combines dispersing and rheological properties into a single polymeric additive. The polymer contains pigment-affine groups (carboxyl, amino, or phenyl functionalities) for dispersing pigments, and side chains that provide rheological modification through thixotropic behavior. This merging eliminates the need for separate dispersants and rheology additives, preventing pigment reagglomeration and settling while maintaining dispersion stability.
Solution Approach 2:
The invention uses a composite polymeric structure with specific functional groups attached to a polymer backbone. The polymer combines hydrophilic side chains for medium compatibility with pigment-affine groups for surface orientation. This composite structure provides both dispersing capability and rheological control, creating a material that simultaneously addresses pigment dispersion and settling resistance.
2Stability of the object's composition
If multiple additives are used to achieve both dispersing and rheological properties, then pigment dispersion and settling prevention can be improved, but the formulation complexity and number of components increase
Solution Approach 1:
The polymeric additive is designed to perform multiple functions simultaneously: it acts as a dispersing agent through pigment-affine groups, provides rheological modification through thixotropic behavior, and ensures medium compatibility through hydrophilic side chains. This multi-functional universal additive replaces the need for multiple separate additives, simplifying the formulation while maintaining dispersion stability and preventing settling.
Solution Approach 2:
The patent merges the functions of dispersants and rheology additives into a single polymeric compound. By incorporating both dispersing functionalities (carboxyl, amino, or phenyl groups) and rheological properties (thixotropic behavior) into one additive, the formulation complexity is reduced while achieving both dispersion stability and settling resistance.
3Productivity
If polymeric wetting and dispersing agents are used to ensure rapid orientation to pigment surface, then dispersing efficiency is improved, but rheological properties are insufficient to prevent settling
Solution Approach 1:
The patent combines the rapid surface orientation capability of polymeric dispersants with the settling-prevention capability of rheology additives into a single compound. The polymer's pigment-affine groups ensure rapid orientation to the pigment surface for efficient dispersing, while the same polymer's thixotropic rheological behavior prevents settling, simultaneously achieving both dispersing efficiency and settling resistance.
Solution Approach 2:
The invention creates a composite polymeric structure that integrates both dispersing and rheological functionalities. The polymer backbone with pigment-affine groups provides rapid surface orientation and dispersing efficiency, while the overall polymeric structure with appropriate side chains provides thixotropic rheological properties that prevent settling, achieving both requirements in one material.
4Reliability
If rheology additives are used to achieve thixotropic behavior and prevent settling, then settling resistance is improved, but dispersing properties and color strength are compromised
Solution Approach 1:
The patent creates a composite polymeric material that integrates both rheological and dispersing functionalities. Unlike conventional rheology additives that only provide thixotropic behavior, this polymeric compound includes pigment-affine groups (carboxyl, amino, or phenyl functionalities) that ensure rapid orientation to pigment surfaces and maintain color strength, while simultaneously providing settling resistance through thixotropic rheological properties.
Solution Approach 2:
The invention merges the functions of rheology additives and dispersants into a single polymeric compound. The polymer provides thixotropic behavior for settling resistance while also containing pigment-affine groups for effective dispersing and color strength maintenance, eliminating the compromise between settling resistance and color strength that occurs with separate additives.
Data Source
AI summary
The present invention relates to polyaddition compounds and their salts obtainable by the reaction of - epoxy resin based on at least one diglycidyl ether according to formula (I) with R = a divalent aliphatic or mononuclear aromatic or dinuclear aromatic residue or mixtures thereof, - with at least one polyether alcohol of the general formula (II) R1-[OEt]n-[OPr]m-[OBu]s-[OSO]r-OH formula (II), with R1 = independently identical or different linear or branched, optionally aromatic hydrocarbon residues with 1 to 18 carbon atoms, preferably methyl, butyl, octyl, decyl, dodecyl, tetradecyl, octadecyl or mixtures thereof, with [OEt] = ethylene oxide residue.with [OPr] = propylene oxide residue, with [OBu] = butylene oxide residue, with [OSO] = styrene oxide residue, with n = 0 to 100, preferably n = 1 to 80, particularly preferably n = 10 to 50, m = 0 to 50, preferably m = 0 to 35, particularly preferably m = 0 to 25, s = 0 to 20, preferably s = 0 to 15, particularly preferably s = 0 to 10 and r = 0 to 3, provided that n+m+s+r = 3 to 103, preferably n+m+s+r = 4 to 60, particularly preferably n+m+s+r = 5 to 40, and - with at least one compound containing at least one functional group selected from sulfate groups, sulfonate groups, carboxylate groups or phosphate groups.