Melamine-formaldehyde impregnating resin and preparing method thereof
A technology of melamine and impregnated resin, which is applied in the field of resin and its manufacture, can solve the problems of high production cost and high price of melamine-formaldehyde impregnated resin, and achieve the effects of saving resources and energy consumption, improving production efficiency and reducing costs
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[0018] Example 1
[0019] Add 3500kg of purified water, 7500kg of formaldehyde, 600kg of diethylene glycol and 720kg of modifier into the reactor in turn, stir and add 7L of sodium hydroxide solution to adjust the pH to 9.23, then add 6800kg of melamine and stir for 10 minutes , Raise the temperature to 90.1°C within 30 minutes, control the system to react for 30 minutes at a temperature of 90.1°C and a pH value of 9.23, and then take a sample to detect the water-soluble multiple of the reaction solution. When the water-soluble multiple reaches 2.5, the temperature will drop quickly. When it falls below 30°C, adjust the pH to 8.92, then sample and discharge.
[0020] Various test results
[0021] Test items Quality Index Test results Exterior Colorless transparent liquid Colorless transparent liquid pH value 8.5-9.6 9.0
[0022] Viscosity (s / 20℃) Tu 4# cup 15-25 18 Solid content (wt%) 45-60 56 Water soluble multiple (25℃) ...
Example Embodiment
[0026] Example 2
[0027] Add 3274kg of purified water, 6100kg of formaldehyde, 400kg of diethylene glycol and 600kg of modifier to the reactor in turn, stir and add 8L sodium hydroxide solution to adjust the pH to 9.5, then add 5426kg of melamine and stir for 10 minutes , Raise the temperature to 85°C within 40 minutes, control the system to react for 30 minutes at a temperature of 85°C and a pH of 9.5, and then take a sample to detect the water-soluble multiple of the reaction solution. When the water-soluble multiple reaches 1.7, the temperature will drop quickly. When it drops below 30°C, adjust the pH to 9.6, then sample and discharge.
[0028] Various test results
[0029] Test items Quality Index Test results Exterior Colorless transparent liquid Colorless transparent liquid pH value 8.5-9.6 9.5 Viscosity (s / 20℃) Tu 4# cup 15-25 17 Solid content (wt%) 45-60 53.9 Water soluble multiple (25℃) 1.5-2.5 1.6 Free formaldehyde...
Example Embodiment
[0033] Example 3
[0034] Add 1990kg of purified water, 7290kg of formaldehyde, 324kg of diethylene glycol and 162kg of modifier into the reactor in turn, stir and add 7L of sodium hydroxide solution to adjust the pH to 9.26, then add 6434kg of melamine and stir for 10 minutes , Raise the temperature to 90.1°C within 30 minutes, control the system to react for 30 minutes at a temperature of 90.1°C and a pH value of 9.26, and then take a sample to detect the water-soluble multiple of the reaction solution. When the water-soluble multiple reaches 2.5, the temperature will drop quickly. When it drops below 30°C, adjust the pH to 8.97, then sample and discharge.
[0035] Various test results
[0036] Test items Quality Index Test results Exterior Colorless transparent liquid Colorless transparent liquid pH value 8.5-9.6 9.0 Viscosity (s / 20℃) Tu 4# cup 15-25 18 Solid content (wt%) 45-60 59 Water soluble multiple (25℃) 1.5-2.5 1.9 F...
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