Melamine-formaldehyde resin solution and process for producing the same
A technology of melamine and formaldehyde resin, applied in the field of melamine-formaldehyde resin solution, can solve the problems of expensive regulator, complicated resin synthesis, etc., and achieve the effects of good storage stability and simple preparation.
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Embodiment 1 to 3
[0072] Table 1 shows the test conditions of Examples 1 to 3.
[0073] Heat the 37% formalin solution in a heatable storage container to the mixing temperature T m . At the same time, the melamine and water in a suspended state in a vigorously stirred reactor are also heated to the mixing temperature T m . KOH was dissolved in 250 ml of water and initially charged to a small pressure vessel (base metering vessel) on the reactor. Once the formalin solution and melamine suspension reach temperature T m , the formalin solution and the dissolved KOH are simultaneously metered into the melamine suspension under pressure. The metering process ended after about 2 minutes. Now, at temperature T m The suspension is stirred under autogenous pressure until the point of clarification. Once the suspension is clear to obtain a solution (clearing point), at the condensation temperature T k The condensation was continued until the desired water compatibility of the resin solution was a...
Embodiment 4 and 5
[0075] Examples 4 and 5, continuous process:
[0076] Table 2 shows the test conditions of Examples 4 and 5.
[0077] Continuous metering of 37% formalin solution, melamine, water and KOH at mixing temperature T mIn the suspension container, use the gravity solid metering system to meter melamine, and formalin, water and KOH together as a solution to use the liquid metering system to meter. Keep the suspension stable by stirring. The pH of the suspension was maintained between 9.6 and 9.8. The suspension is compressed to pressure P with a metering pump and pumped at flow D into the tubular reactor. The tubular reactor consists of series connected Vol V Volume of the pre-reactor section and Vol N volume of the post-reactor part. The front reactor is heated electrically, and the temperature of the rear reactor is controlled by a temperature control circuit. In the prereactor, the suspension is heated for a time t a Heating to reaction temperature T r . The heated suspe...
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