木质素磺酸钠改性硬质聚氨酯泡沫材料的制备与性能研究

Preparation and property of sodium lignosulphonate-modified rigid polyurethane foam

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。

In a mixed solvent of PEG 400 and glycerol,the sodium lignosulphonate was liquefied and the product could be directly used as the material to synthesize PUF without separation because there was little solid residue in it.The liquefaction product was mixed with polyether polyol and related auxiliaries,and the resultant mixture reacted with MDI in order to obtain the lignin-modified rigid polyurethane foam.By investigating the effect of the amount of lignin and foaming agents,the mass ratio of liquefied product to the polyether polyols on the apparent density and compression strength of PUF,the foam formulation was optimized.Furthermore the microstructure and thermal stability of modified PUF were studied.The results showed that comparing to the unmodified foam,the compressive strength of modified PUF increased from 481.05 kPa to 880.60 kPa.The carbon residue rate under 700℃substantially unchanged.The uniformity of the cellular structure got worse.