A kind of preparation method of deep eutectic ionic liquid modified lignin-phenolic resin
A phenolic resin and ionic liquid technology, which is applied in the joining of wooden veneers, manufacturing tools, wood processing utensils, etc., can solve the problems of increasing the separation process of ionic liquid and lignin, the complexity of the process, and reduce the separation and regeneration steps. , the preparation process is simple, the reaction is easy to control the effect
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Embodiment 1
[0021] Weigh 14.1g of choline chloride and 66.7g of phenol, put them into a sealed container, and stir at 55°C for 5-6min until the reaction liquid is transparent, and ChCl / P DES is obtained. Transfer the ChCl / P DES into a synthesis reactor equipped with a stirrer and a condensing device, add 13.3 g of dealkalized lignin, and react at 90° C. for 1 hour to obtain a mixture of modified lignin and DES. Slowly add 25.7 g of formaldehyde solution with a mass concentration of 37%, and 27.3 g of a sodium hydroxide solution with a mass concentration of 20%, raise the temperature to 90°C, and automatically cool down to 80°C after 30 minutes of reaction. Slowly add 108.1g of formaldehyde solution with a mass concentration of 37%, raise the temperature to 90°C again, and automatically cool down to 80°C after 20 minutes of reaction. When the desired viscosity is reached at the end of the test reaction, add the second batch of sodium hydroxide 42.1g, and discharge , thus preparing lignin-m...
Embodiment 2
[0023] Weigh 12.1g of choline chloride and 57.1g of phenol, put them into a sealed container, and stir at 55°C for 5-6min until the reaction solution is transparent, and ChCl / P DES is obtained. Transfer the ChCl / P DES into a synthesis reactor equipped with a stirrer and a condensing device, add 22.9 g of lignin, and react at 90° C. for 1 hour to obtain a mixture of modified lignin and DES. Slowly add 25.7 g of formaldehyde solution with a mass concentration of 37%, and 27.3 g of a sodium hydroxide solution with a mass concentration of 20%, raise the temperature to 90°C, and automatically cool down to 80°C after 30 minutes of reaction. Slowly add 108.1g of formaldehyde solution with a mass concentration of 37%, raise the temperature to 90°C again, and automatically cool down to 80°C after 20 minutes of reaction. When the desired viscosity is reached at the end of the test reaction, add the second batch of sodium hydroxide 42.1g, and discharge , thus preparing lignin-modified ph...
Embodiment 3
[0025] Weigh 12.1g of choline chloride and 57.1g of phenol, put them into a sealed container, and stir at 55°C for 5-6min until the reaction solution is transparent, and ChCl / P DES is obtained. Transfer the ChCl / P DES into a synthesis reactor equipped with a stirrer and a condensing device, add 22.9 g of sodium lignosulfonate, and react at 90° C. for 1 hour to obtain a mixture of modified lignin and DES. Slowly add 25.7 g of formaldehyde solution with a mass concentration of 37%, and 27.3 g of a sodium hydroxide solution with a mass concentration of 20%, raise the temperature to 90°C, and automatically cool down to 80°C after 30 minutes of reaction. Slowly add 108.1g of formaldehyde solution with a mass concentration of 37%, raise the temperature to 90°C again, and automatically cool down to 80°C after 20 minutes of reaction. When the desired viscosity is reached at the end of the test reaction, add the second batch of sodium hydroxide 42.1g, and discharge , thus preparing lig...
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