PM-21

basic information

**Features** 1. PM-21 promotes the crosslinking reaction between resins containing hydroxyl groups and amino resins. In particular, low-reactivity melamine resins of the HMMM type reduce the baking temperature, necessitating a curing accelerator that shortens the baking time, and PM-21 is effective as such an accelerator. 2. PM-21 has significantly lower viscosity increase during storage compared to free para-toluenesulfonic acid, making it superior for storage. 3. PM-21 lowers the baking temperature by an additional 10°C to 20°C compared to other block-type para-toluenesulfonic acids such as morpholine and aminomethylpropanol. **Addition Amount and Method** The addition amount depends on the reactivity of the main resin, the proportion of melamine resin, and the amount of pigment used, but generally, it is added at around 1.5% to 6% based on the total resin solids. It can be added during the redown or dilution stage. It is advisable to add 10% to 20% of polar solvents such as alcohols, glycols, or esters to the mixed solvent.

Price range

Delivery Time

Applications/Examples of results

Hardening catalyst