Low-temperature curing catalyst for water-based and solvent-based baked coatings.
PM-21 is a curing catalyst used for polyester, acrylic, and alkyd resin systems that crosslink with HMMM type resins in solvent-based and water-based paints containing high solids. ----------------------------------------------------------------------- 【Main Components and Properties】 A solution of a special stable block type para-toluenesulfonic acid Specific gravity at 20/4°C: 1.02 Appearance: White liquid Para-toluenesulfonic acid content: 19.5–21% -----------------------------------------------------------------------
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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.
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Hardening catalyst
Company information
Meiyu Sangyo Co., Ltd. is engaged in the manufacturing and sales of chemical products. We have a manufacturing plant for para-toluenesulfonic acid in Wakayama and handle contract manufacturing of sodium toluenesulfonate and various curing agents. Please feel free to contact us if you have any requests. *Notice* (2022/1/28) Some of our products have been designated as pharmaceutical-grade toxic substances under the Poisonous and Deleterious Substances Control Act. For more details, please refer to the announcements on our official website. https://www.meiyusangyo.co.jp/news/
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