Heat-Stabilized Aqueous Composition Viscosity Control
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Solution Overview
Problem
Aqueous compositions, such as hydraulic binders, adhesives, and paints, face viscosity changes and degradation when temperature varies, leading to altered functional properties, which is detrimental to their performance.
Innovation Solution
Incorporating a heat-stabilizing agent prepared through polymerization of specific monomers, including anionic monomers, C1-C7 esters, and associative monomers, to create an associative compound that maintains viscosity stability across a wide temperature range and shear gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional thickeners are used in aqueous compositions, then viscosity can be maintained or increased, but viscosity changes and degradation occur when temperature varies
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the thickening agent through polymerization of specific monomers (anionic monomers with carboxylic acid groups, C1-C7 esters of acrylic/methacrylic acid, maleic acid, or itaconic acid, and associative monomers with ethoxylated chains). These structural parameter changes enable the polymer to maintain viscosity stability across a wide temperature range (5-50°C) while providing associative thickening mechanisms that resist temperature-induced degradation.
Solution Approach 2:
The patent employs composite materials by creating a copolymer containing multiple types of monomers with different functions: anionic monomers provide charge and solubility, ester monomers contribute to backbone structure and flexibility, and associative monomers with long alkyl chains (C28-C40) provide hydrophobic interactions and associative thickening. This composite polymer structure achieves superior temperature stability compared to single-component thickeners.
2Reliability
If viscosity is increased to maintain functional properties, then performance at low temperature improves, but viscosity loss occurs at higher temperatures
Solution Approach 1:
The patent converts the potentially harmful effect of temperature increase into a beneficial feature by designing a polymer that undergoes associative thickening through hydrophobic interactions of its long alkyl chains. These interactions strengthen at elevated temperatures, counteracting the typical thermal thinning effect and converting temperature stress into enhanced viscosity maintenance.
Solution Approach 2:
The patent utilizes the curvature and conformational flexibility of the polymer chains, particularly the ethoxylated associative monomers with flexible backbones and rigid terminal groups. This structural curvature enables the polymer to form three-dimensional associative networks that maintain viscosity across temperature variations, with the chains adapting their conformation to resist thermal degradation.
3Ease of operation
If standard polymers are used for thickening, then viscosity can be achieved, but the composition degrades under variable temperature conditions
Solution Approach 1:
The patent applies local quality by incorporating specific functional segments within the polymer chain: anionic carboxylic acid groups provide local charge density for electrostatic interactions, ester groups provide local flexibility and hydrophobicity, and terminal long alkyl chains (C28-C40) provide localized associative domains. These locally differentiated properties enable the polymer to maintain viscosity control across variable temperature conditions through multiple simultaneous mechanisms.
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 heat-stabilizing agent effectively maintains viscosity within 50-98% of the initial value across temperature ranges from 5 to 50°C and shear gradients from 0.1 to 1000 s−1, preventing viscosity loss and ensuring consistent performance.
Implementation Method 1
at least one associative monomer of formula (I): R1-(EO)m-(PO)n-R2 wherein R2 independently represents a straight C28-C40-alkyl group or a branched C28-C40-alkyl group
Implementation Method 2
the addition of at least one heat-stabilising agent (P) prepared by at least one polymerisation reaction
Data Source
AI summary
A preparation of an aqueous composition that is resistant to temperature variations may include the use of at least one specific heat-stabilizing agent. The heat stabilization of the viscosity of the aqueous composition within a wide temperature range. Such heat-stabilizing agents may include, in polymerized form: (a1) an anionic monomer comprising a polymerizable olefinic unsaturation and a carboxylic acid group, optionally in salt form; (a2) a C1-C7 ester of acrylic acid, methacrylic acid, maleic acid, and/or itaconic acid; (a3) an associative monomer of a formula, R1-(EO)m-(PO)n-R2, wherein m and n are independently 0 or an integer or decimal less than 150, m or n being different from 0, EO is independently a CH2CH2O group, PO is independently a combination of (i) CH2CH2O and (ii) CH(CH3)CH2O and/or CH2CH(CH3)O, R1 is independently a group comprising a polymerizable olefinic unsaturation, and R2 is independently a straight C28-C40-alkyl group or a C28-C40-alkyl group.