Plywood glue and preparation method thereof
A plywood and glue technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as lack of production capacity, achieve low production costs, improve product quality, and simple and reasonable processes Effect
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[0012] Example 1
[0013] (1) According to the molar ratio, add polyvinyl alcohol to 100 times the formaldehyde, react for 10 minutes, stir and add alkali to adjust pH=10.5;
[0014] (2) Add urea to the mixture obtained in step 1, the amount of urea added is 1:5 based on the molar ratio of formaldehyde, the temperature is increased to 70°C, kept for 1h, the pH is adjusted to 6 with HCl, and the temperature is decreased to 40°C;
[0015] (3) Adjust the pH to 5 again, after 30 minutes, adjust to 4.1, add melamine twice the amount of urea in step 2, then add the same amount of urea in step 2, stir and heat to 80°C, until the solution viscosity reaches 5000mPa ·S, adjust the pH to 8.0;
[0016] (4) The resulting solution is heated and vacuum dehydrated, and then cooled to 35°C, adjusted to pH 6.6, and then put the glue to obtain.
Example Embodiment
[0017] Example 2
[0018] (1) According to the molar ratio, add polyvinyl alcohol to 160 times the amount of formaldehyde, react for 10 minutes, stir and add alkali to adjust pH=10.5;
[0019] (2) Add urea to the mixture obtained in step 1, the amount of urea added is 1:5.5 based on the molar ratio of formaldehyde, the temperature is increased to 70°C, kept for 1h, the pH is adjusted to 6.5 with HCl, and the temperature is reduced to 40°C;
[0020] (3) Adjust the pH to 5 again, after 30 minutes, adjust to 4.3, add 3 times the amount of urea in step 2 of melamine, then add the same amount of urea in step 2, stirring and heating to 80 ℃, until the solution viscosity reaches 5000mPa ·S, adjust the pH to 8.2;
[0021] (4) The obtained solution is heated and vacuum dehydrated, and then cooled to 35°C, adjusted to pH 7 and then put the glue to obtain.
Example Embodiment
[0022] Example 3
[0023] (1) According to the molar ratio, add polyvinyl alcohol to 120 times the formaldehyde, react for 10 minutes, stir and add alkali to adjust pH=10.5;
[0024] (2) Add urea to the mixture obtained in step 1, the amount of urea added is 1:5.3 according to the molar ratio of formaldehyde, the temperature is increased to 70°C, kept for 1h, the pH is adjusted to 6.3 with HCl, and the temperature is reduced to 40°C;
[0025] (3) Adjust the pH to 5 again, after 30 minutes, adjust to 4.3, add 2.5 times the amount of urea in step 2 of melamine, then add the same amount of urea in step 2, stir and heat to 80 ℃, until the solution viscosity reaches 5000mPa ·S, adjust the pH to 8.1;
[0026] (4) The obtained solution is heated and vacuum dehydrated, and then cooled to 35°C, adjusted to pH 6.8, and then put the glue to obtain.
[0027] The properties of the adhesive prepared by the present invention are as follows:
[0028] 1. Viscosity
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