建筑涂料 化学品

Pure acrylic emulsions dominate premium exterior paints for UV and weathering resistance. Styrene-acrylic copolymers offer a cost-effective alternative for interior applications. Waterborne alkyd dispersions are preferred where alkyd's excellent brushability and film hardness are needed without solvent emissions.

HASE/HEUR associative thickeners provide excellent leveling and shear-thinning rheology for waterborne architectural paints. Cellulosic thickeners (HEC, HMHEC) are economical for lower-shear applications. The choice depends on PVC, binder type, and the required balance between sag resistance and leveling.

Polymeric dispersants with anchoring groups (polyacrylate-based) are standard for TiO2 and extender dispersion. For high-PVC formulas with mixed pigments, hydrophilic dispersants with good compatibility across pigment types work best. We supply several grades suitable for both waterborne and solventborne systems.

Matte interior paints sit above critical PVC (CPVC) — typically 70–80% PVC — using high extender loading for the desired flat finish. Semi-gloss and gloss paints sit below CPVC at 25–45% PVC for film integrity, scrub resistance, and sheen. The CPVC depends on binder type, pigment particle size, and dispersant — measured by oil absorption, contrast ratio, or porosity testing.

Coalescents (Texanol, propylene-glycol-based esters) are slow-evaporating solvents that temporarily plasticize polymer particles below their MFFT, allowing fusion into a continuous film at low ambient temperature. They evaporate after film formation. Low-VOC and zero-VOC paints replace conventional coalescents with reactive coalescents, alternative low-Tg binder design, or polymer architecture that lowers MFFT without solvent.

100% acrylic emulsion binders give the best UV and hydrolytic stability for exterior facade paints. Non-chalking TiO2 grades, UV absorbers, and HALS extend service life. Higher PVC is avoided to maintain barrier properties. The ASTM D662 chalking and D2244 color difference tests after 5-year Florida exposure benchmark long-term performance for 15+ year warranty paint systems.