Urea Urethane Dispersant Additives for Paint Stability
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Solution Overview
Problem
Current dispersant technologies, such as polyisocyanate adduct mixtures and phosphoric acid esters, suffer from low selectivity, high viscosity, and limited universality, leading to inadequate dispersion and stability issues in paints and plastics, resulting in increased viscosity, color drift, loss of gloss, and reduced mechanical strength.
Innovation Solution
A process producing an additive composition involving a hydroxy component reacted with a diisocyanate in a specific molar ratio, followed by removal of excess diisocyanate and formation of a head group residue with saltable functions, enhancing the dispersing and wetting capabilities across a wide range of solids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyisocyanate adduct mixtures are used as dispersants, then dispersing capability is achieved, but viscosity increases and compatibility deteriorates due to excess isocyanate and cross-linked by-products
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of hydroxy component to diisocyanate (0.95-1.05), ensuring complete reaction without excess isocyanate. This stoichiometric control prevents cross-linked by-products, maintaining low viscosity and good compatibility while achieving effective dispersing capability.
2Productivity
If one-stage synthesis of polyisocyanate mixture is used, then production efficiency is improved, but product heterogeneity increases leading to reduced dispersant quality
Solution Approach 1:
The patent segments the synthesis process into two distinct stages: first forming isocyanate adducts with precise stoichiometry, then reacting with phosphoric acid esters. This segmentation ensures homogeneous product structure while maintaining production efficiency, avoiding the product heterogeneity issues of one-stage synthesis.
3Ease of operation
If branched adducts containing biuret groups are produced, then dispersant functionality is achieved, but compatibility and solubility are compromised
Solution Approach 1:
The patent applies local quality by introducing specific functional groups (phosphoric acid ester groups withsaltable functions) at the molecular level to provide localized interaction with solid particles. This ensures dispersant functionality while maintaining overall molecular compatibility and solubility in various binder systems.
4Manufacturing precision
If phosphoric acid esters are used as wetting and dispersing agents, then high-quality dispersion is achieved, but universality is limited for different types of solids
Solution Approach 1:
The patent achieves universality by combining phosphoric acid ester groups withsaltable functions that can interact with acidic, neutral, and basic solid surfaces through multiple mechanisms (hydrogen bonding, electrostatic interactions). This multi-functional design enables high-quality dispersion across diverse solid types including pigments, fillers, and fibers.
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 additive composition exhibits excellent dispersing and wetting effects on solids with acidic, neutral, and basic surfaces, ensuring high-quality dispersion and stability in various binder systems, reducing viscosity, and enabling high-solids-content formulations with improved environmental compatibility.
Implementation Method 1
a hydroxy component of the general formula (I) is reacted with a diisocyanate of the general formula (II) which has different reactive NCO groups
Implementation Method 2
Dispersants are generally suitable for stabilizing solid particles in binders, paints, pigment pastes, plastics and plastic mixtures, adhesives and sealants, for reducing the viscosity of corresponding systems
Implementation Method 3
Small amounts of these substances are either applied directly to the solid or added to the dispersing medium
Data Source
AI summary
The invention relates to a method for producing an additive composition which in particular contains specific urea urethanes. The additive composition is extremely suitable as a wetting agent and dispersant.