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    Features

    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models

    ...

    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 1. Key to six-digit product numbers for VORANOLTM polyether polyols.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 2. Interactive tool based on the six-digit product numbers to select VORANOL polyols.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 3. Interactive model to prepare prepolymers based on VORANOL polyols.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 4. Predicted prepolymer viscosity versus temperature.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Table 1: Analytical results of 2K formulation.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Table 2: Modulated DSC at 1 °C/min and 2 °C/min.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Table 3: Reactivity and physical testing results of developmental formulation.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 5. DSC at 1°C/min using precooled components.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 6. DSC at 2 °C/min using precooled components.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 7. Rheology data at 1 °C/min using precooled components.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 8. Curing of 2K PU coating system by coefficient of friction (CoF).
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Table 4: Kinetic parameters estimated from DSC data.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 9. Predicted and experimental values of reaction rates (blue) and degree of cure (red) for 1 and 2 °C/min dynamic DSC scans.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 11. Phase diagram of elastomeric polyurethanes.5
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 10. Factors that influence the viscosity of prepolymer.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 12. Viscosity as a function of time during dynamic scan at 1 °C/min.
    Expanding the Coating Formulators Toolbox by Using Chemo-Rheological Models
    Figure 12. Viscosity as a function of time during dynamic scan at 1 °C/min.
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    Fabio Aguirre, Adam Grzesiak, Asjad Shafi and Yohannes Ghirmazion, The Dow Chemical Co.12.03.18
    Dow Polyurethanes strives to provide the information customers need to guide the selection of raw materials for their formulations and targeted applications. The information is tailored for formulators that use first principles as well as for those that only need the data required to balance the stoichiometry of their systems.

    To improve our customer’s experience we have developed searching and modeling tools that would allow formulators not only to quickly find the components they need but also to predict the viscosity of basic prepolymers and quasi-prepolymers.

    We have also developed other modeling tools capable of predicting the curing time and viscosity buildup of coating systems in a broad range of seasonal temperatures. In this paper, we demonstrate some of the capabilities that can be used by formulators to select polyols based on first principles. Also discussed are the fundamentals behind the mechanistic models that predict prepolymer viscosity as a function of temperature, as well as curing profiles of coating systems at several temperatures as a function of time.

    Introduction

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