Bio-based aldehyde-free adhesive for artificial boards and preparation method thereof
A kind of aldehyde adhesive and bio-based technology, which is applied in the field of bio-based aldehyde-free adhesives for wood-based panels and its preparation, can solve the problems of low water resistance, increase cross-linking density, solve the problem of generally low water resistance, Effect of improving hydrolytic stability
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Embodiment 1
[0053] Add 800 parts of bio-oil and 200 parts of plant polyol into a three-necked flask, stir and heat, and raise the temperature to 120°C. Dehydration under reduced pressure at 120°C for 2 hours, with a pressure of 0.095MPa, and nitrogen protection at the same time. Stop heating after dehydration under reduced pressure, wait for the temperature to drop to 70°C naturally, stop nitrogen flow and return to atmospheric pressure. Add 2 parts of dibutyltin dilaurate, then gradually add 400 parts of toluene diisocyanate within 1 hour, stir and react at 70°C for 3 hours, and obtain a bio-based formaldehyde-free adhesive after cooling.
[0054] The performance indicators of the bio-based formaldehyde-free adhesive prepared in this example are shown in Table 1.
Embodiment 2
[0056] Add 700 parts of bio-oil and 250 parts of plant polyol into a three-necked flask, stir and heat, and raise the temperature to 120°C. Dehydration under reduced pressure at 120°C for 2 hours, with a pressure of 0.095MPa, and nitrogen protection at the same time. Stop heating after dehydration under reduced pressure, wait for the temperature to drop to 70°C naturally, stop nitrogen flow and return to atmospheric pressure. Add 0.5 parts of stannous octoate and 1 part of dibutyltin dilaurate, then gradually add 200 parts of toluene diisocyanate and 200 parts of diphenylmethane diisocyanate within 1 hour, stir and react at 70°C for 3.5 hours, and obtain biological Formaldehyde-free adhesive.
[0057] The performance indicators of the bio-based formaldehyde-free adhesive prepared in this example are shown in Table 1.
Embodiment 3
[0059] Add 600 parts of bio-oil and 300 parts of plant polyol into a three-necked flask, stir and heat, and raise the temperature to 120°C. Dehydration under reduced pressure at 120°C for 2 hours, with a pressure of 0.095MPa, and nitrogen protection at the same time. Stop heating after dehydration under reduced pressure, wait for the temperature to drop to 70°C naturally, stop nitrogen flow and return to atmospheric pressure. Add 1.5 parts of bismuth laurate, then gradually add 400 parts of diphenylmethane diisocyanate within 1 hour, stir and react at 70°C for 4 hours, and obtain a bio-based formaldehyde-free adhesive after cooling.
[0060] The performance indicators of the bio-based formaldehyde-free adhesive prepared in this example are shown in Table 1.
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