E0-level environment-friendly modified urea formaldehyde resin for shaving board and preparation method thereof
A urea-formaldehyde resin and particle board technology, applied in the field of urea-formaldehyde resin, can solve the problems of unstable formaldehyde emission, poor slab pre-compression performance, large fluctuation of solid content, etc., to improve the pre-compression effect, reduce the heat of reaction, and reduce the emission amount. Effect
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Embodiment 1
[0048] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:
[0049] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with acid, and raise the temperature to 45°C, add polyvinyl alcohol, and keep warm for 35 minutes;
[0050] (2) Add the first batch of urea and keep warm at 45°C for 35 minutes;
[0051] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;
[0052] (4) Heat up to 90°C, time and keep warm for 60 minutes, and check that the pH is ≥ 6.5;
[0053] (5) Cool down to 83°C, add acid to adjust pH=4.8-5.2, carry out polycondensation to target viscosity of 150-180cp / 30°C, and terminate the reaction;
[0054] (6) Lower the temperature, add alkali to adjust pH=6.0-6.3, add the third batch of urea to the reactor, keep it warm at 82°C...
Embodiment 2
[0061] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:
[0062] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with strong acid, and raise the temperature to 55°C, add polyvinyl alcohol, and keep warm for 25 minutes;
[0063] (2) Add the first batch of urea and keep warm at 55°C for 25 minutes;
[0064] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;
[0065] (4) Heat up to 92°C, time and keep warm for 40 minutes, and check that the pH is ≥ 6.5;
[0066] (5) Cool down to 93°C, add acid to adjust pH=4.8-5.2, carry out polycondensation to target viscosity of 150-180cp / 30°C, and terminate the reaction;
[0067] (6) Lower the temperature, add alkali to adjust pH=6.0-6.3, add the third batch of urea to the reactor, keep it warm ...
Embodiment 3
[0074] Particleboard of the present invention uses E 0 An example of grade environment-friendly modified urea-formaldehyde resin. In the present embodiment, the synthesis of the urea-formaldehyde resin comprises the following steps:
[0075] (1) Put formaldehyde into the reaction kettle, stir, adjust the pH to 3.0 with strong acid, and raise the temperature to 50°C, add polyvinyl alcohol, and keep warm for 30 minutes;
[0076] (2) Add the first batch of urea and keep warm at 50°C for 30 minutes;
[0077] (3) Add alkali to adjust pH=7.0~7.5, mix the second batch of urea and melamine into the reactor;
[0078] (4) Heat up to 90°C, time and keep warm for 50 minutes, and check that the pH is ≥ 6.5;
[0079] (5) Cool down to 88°C, add acid to adjust pH=4.8-5.2, carry out polycondensation to target viscosity of 150-180cp / 30°C, and terminate the reaction;
[0080] (6) Cool down, add alkali to adjust pH=6.0~6.3, add the third batch of urea to the reactor, keep it warm at 85°C for ...
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