Liquid Rheology Control Agent for Coatings
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Solution Overview
Problem
Current rheology control auxiliaries for liquid systems, such as clays and urea-based compounds, often lead to poor rheological performance, clouding, haze, and dust issues, and are difficult to incorporate effectively, limiting their compatibility and application in various systems.
Innovation Solution
A composition comprising a mixture of compounds according to formula (I), where IC1 and IC2 represent hydrocarbyl groups, AM represents a hydrocarbyl group, and RP1, RP2, RP3, RP4, and RP5 are organic groups with specific alkylene oxide units, is used to control rheology, prepared through a process involving monohydroxy compounds and diisocyanates, providing improved rheological efficacy and ease of incorporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dry solid rheology control auxiliaries (clays, silicas, hydrogenated castor oil, polyamide waxes) are used, then rheological control is achieved, but processing complexity increases due to required temperature control and shear forces, and dust is generated during handling
Solution Approach 1:
The invention changes the physical state parameter of rheology control agents from solid to liquid form. The compounds of formula (I) are designed to be liquid at application temperatures, eliminating the need for temperature control and mechanical activation during incorporation. This parameter change resolves the contradiction by maintaining rheological control effectiveness while eliminating processing complexity and dust generation associated with solid auxiliaries.
2Reliability
If conventional rheology control auxiliaries are used in coating compositions, then rheological control is provided, but clouding and haze occur in clear transparent coatings
Solution Approach 1:
The invention applies local quality by designing compounds with specific molecular structures (formula (I)) that have appropriate solubility characteristics for clear coating systems. The compounds contain hydrocarbyl groups and alkylene oxide units that provide compatibility with transparent coating matrices, ensuring rheological control without the clouding and haze effects that plague conventional auxiliaries in clear coatings.
3Ease of operation
If urea urethane rheology control agents are incorporated into liquid phase application systems, then liquid form rheology control is achieved, but pronounced elastic behaviour (jelly effect) occurs leading to visual appearance defects and surface defects
Solution Approach 1:
The invention changes the chemical structure parameters of liquid rheology control agents by modifying the urea component structure in formula (I). This structural modification alters the rheological mechanism from elastic-dominated (jelly effect) to viscous-dominated flow behavior. The compounds maintain ease of incorporation as liquids while eliminating the harmful elastic effects that cause visual appearance defects and surface defects in coated products.
4Reliability
If a rheology control auxiliary is selected to provide good rheological efficacy, then rheological performance is improved, but compatibility with various application systems becomes limited
Solution Approach 1:
The invention achieves universality by designing compounds of formula (I) with modular molecular structures that can be adapted to different application systems. The hydrocarbyl groups (IC1, IC2, AM) and alkylene oxide units can be varied to provide compatibility with different coating matrices (water-based, solvent-based, high solids). This multi-functionality allows the same compound class to provide effective rheological control across diverse application systems, resolving the contradiction between efficacy and versatility.
Data Source
AI summary
The invention relates to a composition comprising a mixture of compounds according to formula (I) wherein IC1 and IC2 independently of one another and of each occurrence represent a hydrocarbyl group, AM independently of each occurrence represents N a hydrocarbyl group, m is the average number of repeating units from 0 to 20, RP1 and RP2 independently of one another and of each occurrence represent an organic group selected from RP3, RP4, RP5, wherein RP3 represents a hydrocarbyl group, RP4 represents an t7 organic group according to formula (II) RP41-(AO)n- wherein RP41 represents a hydrocarbyl group having 1 to 24 carbon atoms, AO represents an alkylene oxide repeating unit and n is the average number of repeating units from 6 to 30, RP5 represents an organic group N according to formula (III) RP51-(AO)p- wherein RP51 represents a hydrocarbyl group having 1 to 24 carbon atoms, AO represents an CN alkylene oxide repeating unit and p is the average number of repeating units from 1 to 5, wherein the mixture comprises compounds of formula (I) wherein (A) RP1 is RP3 and RP2 is RP4, (B) RP1 is RP4 and RP2 is RP5, (C) RP1 is RP3 and RP2 is RP5.