Coalescents and co-solvents that enable film formation in waterborne and solventborne coatings u2014 butyl glycol ether, diethylene glycol monoethyl ether, and freeze-thaw glycols, with low-VOC options.
Glycol ether solvents are the coalescents and co-solvents that let a waterbornencoating form a continuous film as it dries. A coalescent temporarily softens latexnparticles so they fuse below the binder's minimum film-formation temperature (MFFT), thenndiffuses out of the film. Ethylene glycol monobutyl ether (butyl glycol ether, CAS 111-76-2)nis the standard coalescent for latex systems. Specify a coalescent when a paint must cure atnlow ambient temperature, and size the dose to the binder's MFFT rather than overdosing forninsurance.
nnHere is the honest trade-off. A coalescent lowers MFFT and improves cold-weather filmnformation, but a slow-evaporating coalescent stays in the film and counts toward thencoating's VOC. Where regulations cap VOC, formulators move to low-VOC or VOC-exemptnco-solvents and lean harder on binder design instead of dosing more solvent. Diethylenenglycol monoethyl ether (CAS 111-90-0) is a high-boiling co-solvent used to extend open timenand flow. Confirm the VOC classification for your product type and jurisdiction beforenlocking a grade.
nnEthylene glycol (CAS 107-21-1) and propylene glycol (CAS 57-55-6) sit in the same toolboxnas freeze-thaw stabilizers and co-solvents; propylene glycol is the lower-toxicity choicenwhere a paint may see consumer handling. Diacetone alcohol (CAS 123-42-2) is a ketone-alcoholnco-solvent for solvency and flow. None of these replaces the binder, so treat them asnformulation aids that tune drying and stability, not as the property-defining ingredient.
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