纤维素乙醇木质素聚氨酯泡沫的制备及性能研究

Study on Preparation and Properties of Cellulose Ethanol Lignin Based Polyurethane Foam

该研究通过将木质素与聚乙二醇按照不同比例混合液化,经过分析计算,选取较优液化产物制备聚氨酯泡沫。然后,通过控制变量法在不同系列下制备木质素聚氨酯泡沫,放置48~72 h固化后再切割成规格为5 cm×5 cm×5 t2m的正方体试件,放置于烘干箱中将其烘干至恒重,检测其相关性能。研究得出:木质素用液化试剂聚乙二醇400按照固液比80:220、催化剂浓H_2SO_41.8%、在液化温度和时间分别为170℃、2 h的条件下液化,得到液化产物的羟值为290 mgKOH/g、黏度为780.2 mPa.s。木质素液化产物与异氰酸酯原料比为1:1.1,发泡剂H_2O、催化剂三乙胺和二月桂酸二丁基锡(质量比1:1)、表面活性剂二甲基硅油分别占总量的4.5%、3%和13%条件下制备出的木质素聚氨酯泡沫效果较优。

The lignin and polyethylene glycol were mixed and liquefied with different ratios,through analysis and calculation,the polyurethane foam was prepared by selecting the optimum liquefaction products.Then,prepared the lignin based polyurethane foam through the control of variables in different series,and cut into specifications for 5 cm × 5 cm × 5 cm of the cubic specimens after curing for 48-72 h,then placed in the drying box for drying to constant weight,and detected relevant performances.The study results show that：when the solid-liquid ratio of lignin used liquefied reagent polyethylene glycol 400 is 80：220,the catalyst H_2SO_4 is 1.8%,and the liquefaction temperature and time is respectively 170 ℃,2 h,the hydroxyl value of liquefied product is290 mgKOH/g,the viscosity is 780.2 mPa·s.The excellent performance of lignin based polyurethane foam can be obtained when the raw material ratio of lignin liquefied product and isocyanate is 1：1.1,the foaming agent of H_2O,catalyst and triethylamine two lauric acid tin（mass ratio of 1：1）,dimethyl silicone oil surfactant are respectively 4.5%,3%and 3%of the total mass.