Thermostable metaformaldehyde containing condensate of melamine and formaldehyde, and its preparation method

• Main Author: LIN,HU YE
• Format: Patent
• Language: English
• Published: 14.02.2007
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The invention discloses a thermostable metaformaldehyde containing condensate of melamine and formaldehyde, and its preparation method, which consists of charging melamine and methyl aldehyde into a bottle with a stirrer, a temperature gage and a reflux condenser, charging composite disperser solution 5-15 weight parts at 60-75 deg C, adjusting pH to 6.3-6.5, elevating temperature to 80-95 deg C, reacting 0.5-1.5 hrs, adjusting pH to 6.8-7.2, stopping the reaction, washing and filtering the reactant, thus obtaining MF condensate and storing at low temperature, then charging polyoxymethylene resin 100 weight parts, melamine methylene oxide condensate 0.07-1.8 weight parts, anti-oxidizing agent 0.1-0.5 part, formic acid absorbent 0.05-0.5 weight part, lubricating agent 0.1-0.5 weight part into a high speed mixing machine, melting with exhaustion type double screw bolt extrusion machine for squeezing and granulating.