agent de coalescence definition


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PDF Introduction to fragmentation and coalescence

coalescence model are classified here as follows: 1 Identification of the kind of process leading to fragmentation or coalescence; 2 Measurements of the size of the final products of the fragmentation or coalescence; 3 Definition of the final state of the fragmentation or coalescence process and measurement of the duration of the process

PDF Latex Drying Chapter

Surfactant Surfactant Surfactant Conveyed Conveyed Conveyed to to to Air/Film Air/Film Air/Film by by by Evaporating Evaporating Evaporating Water Water Water Surfactant Surfactant Emulsifies Emulsifies Epoxy Epoxy Particles Particles Displacement Displacement Displacement from from from Coalescing Coalescing Coalescing Particles Particles Particle

  • How do you know if a coalescing agent is effective?

    The film below the MFFT stays milky white and cloudy. The main indicator for determining the efficiency of the coalescing agent is the determination of the effect on wet scrub resistance. This is true for the application in high PVC paints (PVC >60).

  • What is an example of a coalescent?

    Some of the examples include 2,2,4-trimethyl-1,3-pentane diol mono-isobutyrate; "Texanol®" (TPiB) and propylene glycol mono esters of C6/C10-aliphatic acids. Related Read: Select coalescents using HSP to improve film formation.

  • What contributes to film formation during coalescence?

    Voyutskii et theorized that the critical contributions to film formation occur during the latter stages of coalescence when polymer chains diffuse from par- ticle to particle. The residual structure of spherical particles diminishes and the film becomes homogenous and cohesive. This process is commonly referred to as autohesion or self- diffusion.

  • Are there coalescing agents based on different molecules?

    In the current market there are several coalescing agents based on different molecules, and many comply with Directive 2004/42/EC of the European Parliament and of the Council on limiting emissions of volatile organic compounds (VOC), which is already adopted in various Latin American countries.

Transition Transition Transition Drying Drying Drying (Regime (Regime (Regime II) II) II)

Surfactant Surfactant Surfactant Conveyed Conveyed Conveyed to to to Air/Film Air/Film Air/Film by by by Evaporating Evaporating Evaporating Water Water Water Surfactant Surfactant Emulsifies Emulsifies Epoxy Epoxy Particles Particles Displacement Displacement Displacement from from from Coalescing Coalescing Coalescing Particles Particles Particle

Cured Cured Film Film

Surfactant Surfactant Surfactant Trapped Trapped Trapped in in in Bulk Bulk Bulk Interstices Interstices Interstices Concentration Concentration Concentration in in in Receding Receding Receding Water Water Water Layer Layer Layer atatat Film/Substrate Film/Substrate Film/Substrate Interface Interface Interface Miscible Miscible Surfactant Surfacta

3.1.3.4 Curing Agent Solubility and Precipitate Morphology

Another important difference between solvent cast and latex films involves the behavior of insoluble third phase particles such as fillers or curing agents. This behavior has best been studied in the paint industry where insoluble pigments are supported in solvent-based and latex media. With solvent-based coatings, the dissolved supporting polyme

m d t ˆ

where x ˆm and x ˆd are the normalized water mass fractions corresponding to the model and the experimental data, respectively, and tˆ is time normalized by the initial water mass fraction. The deviation Dx has units of time. Deviation Experimental Data vtechworks.lib.vt.edu

3.3 Summary

Given that the molecular structure of the epoxies used in both solventborne and waterborne latex laminating resins is the same, potential performance dissimilarity must arise from 1) differences in the physics of film formation or 2) the presence of additives residual from the emulsion. Fundamental differences exist between drying and film formati

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