Urea-formaldehyde resin adhesive with ultra-low formaldehyde release and preparation process thereof
A technology of formaldehyde release and urea-formaldehyde resin, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problem of large impact on the subsequent process of plywood, high formaldehyde release, and poor pre-compression and other problems, to achieve the effects of long open storage time, low formaldehyde emission and good pre-compression
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Embodiment 1
[0019] 1) Heat the reaction kettle to 58°C, add 35% formaldehyde solution, and then adjust the pH to 8.45 with 8.5mol / l sodium hydroxide;
[0020] 2) When the temperature is increased to 68°C, 42% urea is added to the reactor, and then the reaction is kept at 89°C for 40 minutes. 58% urea is added and reacted at 89°C for 40 minutes. In the process, 45% formic acid is added dropwise. Control the pH of the reaction at 6.5;
[0021] 3) Control the temperature at 86°C, use a Tu-4 cup to measure the viscosity between 30 and 15 seconds, adjust the pH value to 8.1 with 8.5mol / l sodium hydroxide, add hydroxymethylcellulose, and react for 15 minutes;
[0022] 4) Add aluminum sulfate to react for 15 minutes, adjust the pH to 7.7 with 45% formic acid, and start to cool down. When the temperature drops to 65°C, add polyvinyl alcohol and pure water, keep 68°C and stir for 30 minutes and continue to cool down.
[0023] 5) When the temperature drops to room temperature, filter and discharge.
[0024]...
Embodiment 2
[0027] 1) Heat the reactor to 58°C, add 35% formaldehyde solution, and then adjust the pH to 8.35 with 9mol / l sodium hydroxide;
[0028] 2) When the temperature is increased to 68°C, 45% urea is added to the reaction kettle, and then the reaction is kept at 89°C for 40 minutes. 55% urea is added and reacted at 89°C for 40 minutes. In the process, 45% formic acid is added dropwise. Control the pH of the reaction at 6.6;
[0029] 3) Control the temperature at 86°C, use the Tu-4 cup to measure the viscosity between 30 and 16s, adjust the pH to 8.1 with 8.5mol / l sodium hydroxide, add hydroxymethylcellulose, and react for 15 minutes;
[0030] 4) Add aluminum sulfate to react for 15 minutes, adjust the pH to 7.8 with 45% formic acid, and start to cool down. When the temperature drops to 65°C, add polyvinyl alcohol and pure water, keep at 70°C and stir for 30 minutes and continue to cool down.
[0031] 5) When the temperature drops to room temperature, filter and discharge.
[0032] The mass ...
Embodiment 3
[0035] 1) The reaction kettle is heated to 58°C, 40% formaldehyde solution is added, and then the pH value is adjusted to 8.35 with 10mol / l sodium hydroxide;
[0036] 2) When the temperature is increased to 68°C, 45% urea is added to the reaction kettle, and then the reaction is kept at 89°C for 40 minutes. 55% urea is added and reacted at 89°C for 40 minutes. In the process, 45% formic acid is added dropwise. Control the pH of the reaction at 6.6;
[0037] 3) Control the temperature at 86°C, use the Tu-4 cup to measure the viscosity between 30 and 15 seconds, adjust the pH value to 8.1 with 8.5mol / l sodium hydroxide, add hydroxymethyl cellulose, and react for 15 minutes;
[0038] 4) Add aluminum sulfate to react for 15 minutes, adjust the pH to 7.1 with 45% formic acid, and start to cool down. When the temperature drops to 65°C, add polyvinyl alcohol and pure water, keep at 70°C and stir for 30 minutes and continue to cool down.
[0039] 5) When the temperature drops to room temperat...
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