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以聚乙二醇400(PEG 400)与丙三醇的混合液对木质素磺酸钠(SLS)进行液化改性,获得残渣率极低的溶剂液化产物,无需分离,直接与聚醚多元醇及相关助剂复配,并与二苯基二异氰酸酯(MDI)反应,制备木质素改性的硬质聚氨酯泡沫材料(PUF)。通过考察SLS和发泡剂用量及液化产物与多元醇的复配比等因素对改性泡沫材料表观密度与压缩强度的影响,优化了发泡配方,并对材料的微观形貌、结构及热稳定性进行了研究。研究结果表明,利用SLS溶剂液化产物改性的PUF材料与未改性的泡沫材料相比,压缩强度从481.05kPa最高可提高至880.60kPa,700℃的残炭率基本不变,但泡孔的均匀性下降。
Liquefaction of sodium lignosulfonate (SLS) with a mixture of polyethylene glycol 400 (PEG 400) and glycerol to obtain a liquefied product with extremely low residue rate without the need of separation, directly with polyether polyol And related auxiliaries, and reacted with diphenyl diisocyanate (MDI) to prepare lignin-modified rigid polyurethane foam (PUF). The foaming formula was optimized by examining the effects of the amount of SLS and foaming agent and the compounding ratio of liquefied product and polyol on the apparent density and compressive strength of modified foam. The microstructure, Thermal stability has been studied. The results show that the compressive strength of PUF modified with SLS solvent liquefaction product can be increased from 481.05 kPa up to 880.60 kPa compared with that of unmodified foam, while the residual carbon yield at 700 ℃ remains unchanged. However, Uniformity decreases.