Preparation of urea-melamine-formaldehyde resin adhesive for E0 floor
A melamine and formaldehyde resin technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of high cost and complicated operation, prevent hydrolysis speed, reduce formaldehyde emission, The effect of improving the water-resistant adhesive strength
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example 1
[0028] The first step: add 250g of formaldehyde solution, the first batch of melamine 7.5g, and the first batch of urea 84g into the reactor in a 500ml four-necked flask, adjust the pH to 7.5, raise the temperature to 80℃~90℃, and react for 40min.
[0029] Step 2: Adjust the pH to 5.0 and react at 90°C to the desired viscosity.
[0030] The third step: adjust the pH to 6.5, add 7.5 g of the second batch of melamine and 29 g of the second batch of urea, and react at 90°C for 50 minutes.
[0031] Step 4: Adjust the pH to 7.5, add 45g of the third batch of melamine, and react at 80°C for 40 minutes.
[0032]Step 5: Cool down to 70°C, add 29g of the third batch of urea, continue the reaction at 50°C for 30 minutes, and cool to discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.
example 2
[0034] The first step: add 250 g of formaldehyde solution, the first batch of melamine 7.5 g, and the first batch of urea 84 g into the reactor in a 500 ml four-necked flask, adjust the pH to 8.0, heat up to 85° C., and react for 45 minutes.
[0035] Step 2: Adjust the pH to 5.5, and react to the desired viscosity at 90°C.
[0036] The third step: adjust the pH to 6.5, add 7.5 g of the second batch of melamine and 24 g of the second batch of urea, and react at 90°C for 50 minutes.
[0037] Step 4: Adjust the pH to 8.0, add 45g of the third batch of melamine, and react at 90°C for 40 minutes.
[0038] The fifth step: Cool down to 70°C, add 24g of the third batch of urea, continue the reaction at 60°C for 30 minutes, and cool and discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.
example 3
[0040] The first step: add 250g of formaldehyde solution, 9g of the first batch of melamine, and 84g of the first batch of urea into the reactor in a 500ml four-necked flask, adjust the pH to 9.0, raise the temperature to 90°C, and react for 50min.
[0041] Step 2: Adjust the pH to 5.8, and react to the desired viscosity at 90°C.
[0042] The third step: adjust the pH value to 6.9, add 9 g of the second batch of melamine and 29 g of the second batch of urea, and react at 90°C for 50 min.
[0043] Step 4: Adjust the pH to 9.0, add 52g of the third batch of melamine, and react at 90°C for 40 minutes.
[0044] Step 5: Cool down to 70°C, add 29g of the third batch of urea, continue the reaction at 60°C for 30 minutes, and cool and discharge. Test its performance separately, and the results are listed in Table 1. And use 1% NH 4 Cl and 0.5% H 3 PO 4 For the curing agent pressed poplar plywood, the test results are shown in Table 2.
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