Lignin polyurethane and preparation method thereof
A technology of lignin and polyurethane, applied in the field of polymer chemistry, can solve problems such as unfavorable reaction, influence on foam shape, difficult handling, etc., and achieve the effects of increasing environmental friendliness, good solubility, and high chemical activity
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Embodiment 1
[0040] Obtaining lignin raw materials: steam explosion treatment of corn stalks under the condition of steam pressure 0.5-1.5MPa for 3-8min, and then washing with hot water at 50-95℃ for 1-3 times to remove polysaccharides produced by hemicellulose degradation, The separated sugar solution is used to prepare ethanol, and the residue contains unreacted lignin and cellulose, which can be extracted with 0.3%-2% sodium hydroxide solution at 60-95°C for 2-5 hours to obtain lignin raw material .
[0041] Dissolve the obtained lignin raw material in non-aqueous pyridine after dehydration, carry out acetylation reaction with acetic anhydride for 2 days under the conditions of oxygen barrier, light-proof and normal temperature, and then wash with ether to precipitate lignin and remove all solvents , dried, and then the acetylated lignin was dissolved in deuterated chloroform, and the hydroxyl content of the lignin was determined by H NMR spectroscopy, and the number of hydroxyl groups ...
Embodiment 2
[0043] (1) Pretreatment of lignin: dissolving 10 g of the lignin raw material obtained in Example 1 with 50 g of acetic acid; filtering the residue with a 60-mesh filter to obtain 57 g of filtrate; adding the filtrate to 570 g of distilled water to precipitate lignin; Separate the precipitate; wash the precipitate with distilled water, 40g of water each time, and the pH value of the washing solution after washing 3 times is 6.5; dry the washed precipitate at 100°C, crush it, and pass it through a 160-mesh sieve, and take the Sieve to obtain pretreated lignin, a total of 8.4g;
[0044] (2) Modification of lignin: add 8g in autoclave by the pretreated lignin of step (1) gained, 0.4g solid sodium hydroxide, seal, alternately evacuate and ventilate nitrogen to deoxygenate, then use Add 8g of ethylene oxide to the metering pump, heat to 100°C, and react at this temperature for 2.5h; then cool to room temperature to obtain modified lignin;
[0045] (3) Dissolution of lignin: add 10...
Embodiment 3
[0049] (1) Pretreatment of lignin: dissolving 10 g of the lignin raw material obtained in Example 1 with 150 g of acetic acid; filtering the residue with a 60-mesh filter screen to obtain 158 g of filtrate; adding the filtrate to 7000 g of distilled water to precipitate the lignin; Separate the precipitate; wash the precipitate with distilled water 5 times, each time with 100 mL of water, until the pH value of the washing solution is 6.8; freeze-dry the washed precipitate at -20°C with a freeze dryer, crush it, and pass it through an 80-mesh sieve, and take Sieve that can be sieved to obtain pretreated lignin, a total of 8.9g;
[0050] (2) Modification of lignin: add 8g in autoclave by the pretreated lignin of step (1) gained, 0.04g solid sodium hydroxide, seal, alternately evacuate and logical nitrogen to deoxygenate, then use Add 8g of propylene oxide to the metering pump, heat to 150°C, and react at this temperature for 3h; then cool to room temperature to obtain modified l...
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