Neutralizers are substances that interact with acids (acid salts) and bases (basic salts) to adjust the pH of the medium. It has a great impact on emulsion polymerization, acetalization reaction, resin curing, latex storage, etc. Any organic or inorganic alkaline/acidic substance that can form a salt with a COOH or an OH group can be used as a neutralizing agent, but the neutralizing effects of different alkaline/acidic substances vary greatly. Commonly used neutralizing agents include sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium acetate, sodium pyrophosphate, sodium carbonate, ammonia, hydrochloric acid, phosphoric acid, formic acid, acetic acid, AMP-95, diethanolamine, triethanolamine, and aminoacetic acid. wait. In anionic water-based polyurethane emulsions, when potassium hydroxide is used as the neutralizing agent, the emulsion has a better appearance, is less likely to yellow during storage and high-temperature use, and has better water resistance of the emulsion coating. The degree of neutralization should be controlled at 90% to 100%, and the neutralization temperature should be 30 to 40°C.
