Preparation method of low-cost UMF resin adhesive used for E0-level plywood
A plywood, low-cost technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of complicated operation process and high cost, achieve high reactivity, low cost, and strengthen gluing performance effect
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Embodiment 1
[0023] In the first step, add 320g of 37% formaldehyde aqueous solution and 73g of the first batch of urea to a 500ml flask, adjust the pH value to 2.0 with 20% ammonium chloride solution, raise the temperature to 95°C, and react for 40min.
[0024] In the second step, adjust the pH value to 8.5 with 15% NaOH solution, add the first batch of melamine 8g and the second batch of urea 30g, and react at 95°C for 30min.
[0025] In the third step, use 20% ammonium chloride solution to adjust the pH value to 5.0, and react at 95°C to the required viscosity of 81mpa·s.
[0026] The fourth step is to adjust the pH value to 6.8 with 20% ammonium chloride solution, and add the second batch of melamine 8g and the third batch of urea 37g. React at 90°C for 40 minutes.
[0027] The fifth step is to adjust the pH value to 8.5 with 15% NaOH solution, add the third batch of melamine 33g, and react at 90°C for 20min.
[0028] The sixth step is to lower the temperature to 70°C, add the fourth...
Embodiment 2
[0030]In the first step, add 320g of 40% formaldehyde aqueous solution and 79g of the first batch of urea to a 500ml flask, adjust the pH value to 1.0 with 20% ammonium chloride solution, raise the temperature to 80°C, and react for 70min.
[0031] In the second step, adjust the pH value to 8.0 with 15% NaOH solution, add the first batch of melamine 8g and the second batch of urea 31g, and react at 80°C for 50min.
[0032] In the third step, use 20% ammonium chloride solution to adjust the pH value to 5.5, and react at 80°C to the required viscosity of 74mpa·s.
[0033] The fourth step is to adjust the pH value to 6.5 with 20% ammonium chloride solution, and add the second batch of melamine 8g and the third batch of urea 40g. React at 80°C for 70 minutes.
[0034] The fifth step is to adjust the pH value to 8.0 with 15% NaOH solution, add the third batch of melamine 33g, and react at 80°C for 80min.
[0035] The sixth step is to lower the temperature to 70°C, add the fourth ...
Embodiment 3
[0037] In the first step, add 320g of 38.5% formaldehyde aqueous solution and 84g of the first batch of urea to a 500ml flask, adjust the pH value to 3.0 with 20% ammonium chloride solution, raise the temperature to 85°C, and react for 50min.
[0038] In the second step, adjust the pH value to 8.5 with 15% NaOH solution, add the first batch of melamine 8g and the second batch of urea 30g, and react at 85°C for 40min.
[0039] In the third step, adjust the pH value to 4.5 with 20% ammonium chloride solution, and react at 85°C to the desired viscosity of 95mpa·s.
[0040] The fourth step is to adjust the pH value to 6.9 with 20% ammonium chloride solution, add the second batch of melamine 8g and the third batch of urea 30g. React at 85°C for 30 minutes.
[0041] The fifth step is to adjust the pH value to 9.0 with 15% NaOH solution, add the third batch of melamine 33g, and react at 85°C for 50min.
[0042] The sixth step is to lower the temperature to 70°C, add the fourth batc...
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