Manufacture method for drilled wood cushion board
A manufacturing method and technology for wooden backing boards, applied in the field of wooden backing boards, can solve problems such as burrs, and achieve the effects of improving surface hardness, low formaldehyde emission, and good curing speed
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[0031]
[0032] (2) Production process
[0033] 1. Extract formaldehyde and put it into the reaction kettle at one time, adjust the pH value to be alkaline, raise the temperature to 40-50°C, and add melamine.
[0034] 2. After raising the temperature to 65°C and keeping it warm for a period of time, add urea once.
[0035] 3. Continue to raise the temperature to 90°C and keep it warm for a period of time, then adjust the pH value to be acidic and carry out polycondensation.
[0036] 4. When the viscosity reaches the production requirement standard, adjust the PH value to be weakly alkaline and lower the temperature, add urea for the second time at 75°C and keep it warm for a period of time.
[0037] 5. After the heat preservation is over, add some kind of modifier and adjust the PH value to be weakly alkaline, lower the temperature to 65°C and add urea for the third time and keep it warm for a period of time.
[0038] 6. Add urea for the fourth time and cool down after th...
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