Increment agent for urea-formaldehyde resin, preparing method thereof and urea-formaldehyde resin adhesive
A technology of urea-formaldehyde resin and extender, which is applied in the field of urea-formaldehyde resin glue and extender of urea-formaldehyde resin, which can solve the problems such as the decrease of bond strength between particleboard and fiberboard and wood-based panels, and reduce the molar ratio of urea-formaldehyde resin, etc., and achieve physical Improvement of mechanical properties, improvement of internal bonding strength, and reduction of formaldehyde emission
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Embodiment 1
[0024] 1. Prepare raw materials according to the following weight ratio:
[0025] Formaldehyde (concentration 37%): 200kg
[0026] Urea: 150kg
[0027] Wheat flour: 100kg
[0028] Sodium phosphate: 0.2kg
[0029] Borax: 2kg
[0030] Water: 500kg
[0031] Sodium hydroxide solution (concentration is 30%): appropriate amount
[0032] 2. Add formaldehyde to the reaction kettle, start stirring, adjust the pH value to 6.5-7.0 with sodium hydroxide solution, add water and stir;
[0033] 3. Add wheat flour and sodium phosphate, stir until all are miscible, control the temperature at 20-25°C, measure the pH value, and control the pH value at 7.5-8.0 with sodium hydroxide solution;
[0034] 4. Add borax, control pH=8.5-9.0, temperature at 20-25°C, and react for 12 minutes;
[0035] 5. Add urea, stir until completely dissolved, control the temperature at 20±2°C, and control the pH at 8.0-8.5 with sodium hydroxide solution;
[0036] 6. Transfer the finished product to an aging tan...
Embodiment 2
[0046] Carry out raw material preparation according to the following weight ratio:
[0047] Formaldehyde (concentration 37%): 200kg
[0048] Urea: 150kg
[0049] Wheat flour: 120kg
[0050] Sodium phosphate: 0.3kg
[0051] Borax: 2kg
[0052] Water: 230kg
[0053] Sodium hydroxide solution (concentration is 30%): appropriate amount
[0054] In addition to step 2), the pH value is adjusted to 5.0-5.5 with sodium hydroxide solution; the temperature in step 3) is 15-20 ° C, and the pH is 6.0-6.5; the pH in step 4) is 8.0-8.5, and the temperature is 15 -20°C, the reaction time is 15 minutes; the temperature control in step 5) is 10±2°C, and the pH is 7.0-8.8; except that the pH in step 6) is 7.0-8.8, the rest are the same as in Example 1.
[0055] Product technical indicators:
[0056] Solid content 40-50%
[0057] Viscosity (Tu-4 cups) 15-18 (25°C, S),
[0058] pH 7.0-8.8
[0059] Density 1.10-1.20g / cm 3
[0060] Storage period ≥60 days
Embodiment 3
[0062] Carry out raw material preparation according to the following weight ratio:
[0063] Formaldehyde (concentration 37%): 200kg
[0064] Urea: 200kg
[0065] Calcium carbonate: 100kg
[0066] Sodium metaphosphate: 0.5kg
[0067] Acrylamide: 0.5kg
[0068] Water: 300kg
[0069] Sodium hydroxide solution (concentration is 30%): appropriate amount
[0070] Formic acid solution (concentration is 30%): appropriate amount
[0071] In addition to step 2), use formic acid solution to adjust the pH value to 3.5-4.0; the temperature in step 3) is 25-30 ° C, and the pH is 5.0-5.5; the pH in step 4) is 7.0-7.5, and the temperature is 25-30 ℃, the reaction time is 10 minutes, except that the pH is 8.0-8.8 in step 5) and step 6), the rest are the same as in Example 1.
[0072] Product technical indicators:
[0073] Solid content 40-50%
[0074] Viscosity (Tu-4 cups) 15-18 (25°C, S),
[0075] pH 8.0-8.8
[0076] Density 1.10-1.20g / cm 3
[0077] Storage period ≥60 days
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