Urethane Viscosity Modifier for Emulsion Resin Temperature Stability
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Solution Overview
Problem
Urethane-type viscosity modifiers in emulsion resins and paints cause increased product viscosity when stored at high or low temperatures for extended periods, leading to failures in painting and coating issues.
Innovation Solution
A urethane-type viscosity modifier with a specific chemical structure, represented by general formula (1), which includes linear alkyl groups and hexamethylene groups, is developed to maintain stability and prevent viscosity increases at varying temperatures, synthesized using secondary alcohols, ethylene oxide, and diisocyanate compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If urethane-type viscosity modifiers are used to provide thixotropic viscosity and leveling viscosity, then the paint has high water resistance and adequate viscosity, but the product viscosity increases when stored at high or low temperatures for long periods
Solution Approach 1:
The patent changes the chemical structure parameters of the viscosity modifier by introducing specific linear alkyl groups (C12-C20) and hexamethylene groups with controlled molecular weights and ratios. This structural parameter change enables the viscosity modifier to maintain stable viscosity at high and low temperatures while retaining water resistance properties.
Solution Approach 2:
The patent creates a composite viscosity modifier structure combining linear alkyl groups, hexamethylene groups, and urethane linkages. This composite molecular structure integrates the beneficial properties of each component: linear alkyl groups provide water resistance, hexamethylene groups provide viscosity control, and urethane linkages provide structural stability across temperature ranges.
2Stability of the object's composition
If natural viscosity modifiers or alkali thickening-type viscosity modifiers are used, then increases in product viscosity do not occur during storage, but the paint has thixotropic viscosity and poor water resistance
Solution Approach 1:
The patent changes the chemical composition parameters from natural or simple alkali-based modifiers to a sophisticated urethane-type structure with specific alkyl and hexamethylene groups. This parameter change simultaneously achieves viscosity stability during storage and improved water resistance, resolving the trade-off between these two properties.
3Adaptability or versatility
If emulsion resin-based paint containing urethane-type viscosity modifier is exposed to high-temperature or low-temperature state for long period, then the product viscosity of the paint increases, but this may inhibit fundamental properties of the paint to cause failures in painting
Solution Approach 1:
The patent optimizes the molecular weight parameters of the linear alkyl groups (C12-C20) and hexamethylene groups, and controls their molar ratios to achieve a balance between adaptability for painting applications and viscosity stability under temperature stress. The specific structural parameters prevent excessive viscosity increase while maintaining paint applicability.
Data Source
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AI summary
An object of the present invention is to provide an emulsion resin composition containing a urethane-type viscosity modifier which does not cause an increase in product viscosity of the emulsion resin composition even if the emulsion resin composition is stored at high temperature or low temperature for a long period of time, or an aqueous resin composition. In order to achieve the object of the present invention, the present invention provides a viscosity modifier represented by the following general formula (1) , and an emulsion composition or an aqueous paint composition including the viscosity modifier: where: R1 to R4 each represent a linear alkyl group having 1 to 13 carbon atoms; R5 and R6 each represent a group represented by the following formula (2) or (3); m and n each represent a number from 3 to 15; x represents a number from 40 to 800; and y represents a number equal to or more than 1 , provided that each of a total number of carbon atoms in R1 and R2 and a total number of carbon atoms in R3 and R4 needs to be from 10 to 14.