Product Specifications  

  Other data*  

*The above values are general information and are not part of product specifications.

  Solubility / Dilution           
     Can be diluted with water. Only partially miscible with glycol ethers and glycol ether esters.

  compatibility               
Coreactant for the preparation of waterborne two-component polyurethane systems for aliphatic polyisocyanates such as Desmodur® N 3600, N 3300, Bayhydur® 3100, VPLS 2150/1, VP LS 2319 and VP LS 2336. Co-reactants suitable for making one-pack industrial stoving coatings include: hexamethoxymethyl melamine resins, partially etherified melamine resins such as Maprenal® MF 904, MF 915, Cymel® 303, 325 and 327, and Waterborne aliphatic polyisocyanates such as Bayhydur® BL 5140 and BL 5235.

Features/Applications

General performance

Bayhydrol® A 145 is a hydroxyl functional polyacrylic acid dispersion which can be diluted with water to application viscosity. The viscosity of this product mainly depends on the pH value. Because the pH value may decrease during storage, the viscosity may decrease with it. By adding a small amount of 10% dimethylethanolamine in water, its viscosity can be restored to its original value.
Bayhydrol® A 145 has good pigment wetting and high shear stability. Experiments show that bead mills are suitable for use as grinding equipment. Only pigments and fillers with little water-soluble content can be used. Considering the wide variety of pigments and fillers available, the compatibility of the product should be tested when used. Leveling and substrate wetting can be improved by additions such as BYK® 380 or 348.
Experiments show that BYK® 011 is suitable as a defoamer.
Application and paint mixing equipment can be cleaned with water, alkaline detergents or isopropyl alcohol.

Two-pack industrial coatings
Bayhydrol® A 145 is mixed with aliphatic polyisocyanates to prepare high gloss topcoats that dry at room temperature or force dry at 80°C. The cured film is tough with good single coat adhesion and good water and solvent resistance. If properly formulated, such as this product mixed with Bayhydur® 3100, where the NCO/OH ratio is 1.5:1, the pot life is approximately 3 hours. The pH value of the paint should be 7.8~8.3.
When mixing Bayhydur or Desmodur ® into the millbase, add a thickener to ensure high shear. Experiments have shown that about 0.3% of Acysol® RM 8 (on solids basis) can be added to formulations based on Bayhydrol® A 145.

One-pack industrial baking coatings
Bayhydrol® A 145 is used to mix with melamine resins to prepare baking coatings with less than 5% co-solvent at application viscosity. The system cures in just 30 minutes at 120°C.

The mixing ratio of Bayhydrol® A 145 to amino resin is typically 80:20 (both on a solids basis). Considering the wide variety of amino resins, the compatibility of the product should be tested when used. As a hydroxyl-functional binder, Bayhydrol® A 145 is also suitable as a co-reactant for waterborne aliphatic polyisocyanates such as Bayhydur® BL 5140 and BL 5235.
The ratio of OH:NCO should be 1:1.
To ensure the storage stability of those one-component coating systems based on Bayhydrol® A 145, the pH is adjusted to about 8.5 during preparation.

to store .
When stored in the original airtight container at 5~23℃, Bayhydrol® A 145 has a storage stability of at least 6 months. Bayhydrol® A 145 freezes below 0°C and damage cannot be ruled out. Therefore, it should be stored in antifreeze.

Safety: Hazard Identification
Flammable. Harmful to aquatic life, may cause long-term adverse effects in the aquatic environment.
The Safety Data Sheet (304240) should be read carefully. It includes labelling, transport, storage, product use, product safety and ecological information.