Urea-phenol-formaldehyde co-condensation polymer resin and its production process
A technology of copolycondensation resin and phenol formaldehyde, which is applied in the field of urea-phenol-formaldehyde copolycondensation resin and its production, can solve the problems of insufficient copolycondensation reaction, influence on resin bonding strength, stability, storage period, etc. Low, high bonding strength, sufficient copolycondensation effect
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Embodiment 1
[0010] Embodiment 1 (referring to serial number and the proportioning figure of parts by weight in the table):
[0011] First melt 40 parts of phenol (P) in the reactor, add 60 parts of formaldehyde (F), 30 parts of urea (U), without adding water, adjust the pH to 6-8, raise the temperature to 75-100°C, and keep it warm for 30-100min , and then use ammonium chloride to adjust PH=3.0-5.5, and carry out co-condensation reaction. When the viscosity is ≥20S (20°C, apply 4 cups), use NaoH to adjust the pH=7.5-12.0, control the temperature at 80-95°C, and heat preservation reaction To the end, cooling and discharging.
Embodiment 2
[0013] Melt 25 parts of P in the reactor, then add 5 parts of U, 12 parts of F, and 25 parts of water, and obtain this resin in the same way as in Example 1.
[0014] Embodiment 3 and 4 are all according to the proportioning in the table, and the method with reference to embodiment 1, 2 makes this resin. Embodiment 1-4, molar ratio F: (P+U)≤1.3, F adds once.
Embodiment 5
[0016] Melt P30 parts in the reactor, then add U20 parts, design the total amount of F to be 150 parts, add F68 parts for the first time, adjust the pH to 6-8, raise the temperature to 75-100°C, keep warm for 30-100min, and use hydrochloric acid Adjust PH=3.0-5.5, carry out co-condensation reaction, when the viscosity is ≥20S (20°C, apply 4 cups), use Naco 3 , adjust the pH to 7.5-12.0, add 100 parts of water, add the remaining F82 parts twice, control the temperature at 80-95 ° C, keep warm until the end of the reaction, and cool and discharge.
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