Question 1

What are the main resin systems for waterborne coatings?

Accepted Answer

Pure acrylic emulsions dominate architectural waterborne coatings for outdoor durability and UV resistance. Styrene-acrylic copolymers offer cost-effective indoor performance. Polyurethane dispersions (PUD) give superior hardness, chemical resistance, and flexibility for industrial and floor coatings. Waterborne alkyd dispersions combine alkyd's easy application and gloss with reduced VOC emissions.

Question 2

How do coalescents work in waterborne paint formulations?

Accepted Answer

Coalescents are slow-evaporating solvents that temporarily plasticize polymer particles below their minimum film formation temperature (MFFT), enabling fusion into a continuous film at ambient temperature. Texanol and propylene glycol esters are standard; low-VOC reactive coalescents are used in zero-VOC formulations. Coalescent level is optimized to balance film formation at low temperature against hardness development.

Question 3

What rheology modifiers are used in waterborne coatings?

Accepted Answer

HASE (Hydrophobically modified Alkali-Swellable Emulsions) and HEUR (Hydrophobically modified Ethylene oxide-URethane) associative thickeners provide shear-thinning rheology for leveling and sag resistance. HEC (hydroxyethylcellulose) is a cost-effective thickener for lower-shear applications. Combinations of thickeners optimize KU viscosity, ICI viscosity, and gel structure for specific application methods.

Question 4

How are corrosion-resistant waterborne coatings formulated for industrial use?

Accepted Answer

Corrosion-resistant waterborne systems combine epoxy-acrylic hybrid emulsions or epoxy dispersion/amine hardener (waterborne 2K epoxy) with anticorrosion pigments (zinc phosphate, zinc dust, modified aluminum pigments) and barrier additives. Phosphate ester adhesion promoters improve bonding to steel and galvanized substrates. Performance is tested per ASTM B117 salt-spray and ASTM D4585 humidity resistance standards.

Question 5

What are the VOC limits for waterborne coatings under major regulations?

Accepted Answer

EU Directive 2004/42/EC limits architectural interior flat paints to 30 g/L VOC (Phase II). US EPA National AIM Rule limits interior flat paints to 50 g/L. California SCM/CARB limits are tighter — 50 g/L for flat, 100 g/L for non-flat. Industrial maintenance coatings are regulated separately. Waterborne systems typically achieve 30–150 g/L VOC depending on formulation, well below solventborne equivalents at 300–600 g/L.

Tintas Base Água Produtos Químicos

1,3-Propanediol (PDO)

AMP-95 (2-Amino-2-metil-1-propanol, Amina Multifuncional)

Agente Umectante de Diol Acetilênico S-104 (Não Iônico, Tipo Surfynol 104)

Agente Umectante Diol Acetilênico Surfynol 420

Agente Umectante Diol Acetilênico Surfynol-104 Tipo (Baixa Espuma)

Agente Umectante Diol Acetilênico Surfynol-420 Tipo (Modificado com EO)

Emulsão Alquídica Modificada com Acrílico AAE-50

Promotor de Adesão AP-800 (Ligação Revestimento-Substrato)

Dispersão de Poliuretano Alifático PUD-5100 (Verniz Transparente, Alta Dureza)

Espessante de Emulsão Inchável por Álcali ASE-100

Surfatante Alquil Poliglucosídeo APG-810

Sinergista de Amina MDEA para Cura UV

Óleo de Silicone Funcionalizado com Amino ASO-20

Dispersante Anfótero AD-200

Sílica Antiaderência ABS-5 (D50=5 µm)

Aditivo Antineblina AF-200

Dispersão de Poliuretano Aromático PUD-3100 (Grau Industrial Flexível)

Espessante de Argila Atapulgita AT-100

Entrecruzador Bifuncional de Aziridina BAZ-10 para Tinta e Revestimento Aquosos

Carbonato de Cálcio GCC Grau de Revestimento 1250 Mesh (Extenssor Ultrafino)

Reticulador de Carbodiimida CDI-40

Dispersão de Cera de Carnaúba 25%

Etoxilato de Óleo de Mamona EL-40

Mistura de Éter de Celulose CEB-30

Perguntas Frequentes — Tintas Base Água Produtos Químicos

Procura matérias-primas específicas?