LIP型非离子表面活性剂的制备及其在废纸脱墨中的应用

Preparation of LIP Nonionic Surfactant and Its Application in Flotation Deinking Process

关键词:  脱墨剂  LDEA  IPDI  非离子表面活性剂  复配

Key Words:deinking agent  LDEA  IPDI  nonionic surfactant  compound

摘要:以月桂酸二乙醇酰胺(LDEA)、异佛尔酮二异氰酸酯(IPDI)和不同相对分子质量的聚乙二醇(PEG)为原料制备了一系列LIP型非离子表面活性剂；探讨了最佳合成工艺条件,并对产物进行了结构表征和物理性能检测；研究了合成产物在浮选法废纸脱墨中的应用,并将其与复配脱墨剂以及市售脱墨剂的脱墨效果进行对比。结果表明,使用相对分子质量600的PEG,在反应温度55℃,反应时间2 h,催化剂用量为单体LDEA的1.0%,n(LDEA)∶n(IPDI)∶n(PEG)=1.0∶2.0∶2.0时,合成表面活性剂具有较好的浮选脱墨效果；将LIP-600、月桂醇聚氧乙烯醚(AEO-9)和脂肪醇聚氧乙烯醚硫酸钠(AES)按质量比2∶1∶1复配,复配表面活性剂总质量占绝干纸质量的0.2%时,废纸脱墨效果进一步提高,脱墨后纸浆白度可达72.3%,残余油墨量为51.4 mm²/m²。

Abstract:A series of LIP nonionic surfactant was synthesized by using lauroyl diethanolamide(LDEA), isophorone diisocyanate (IPDI) and different molecular weight polyethylene glycol(PEG) as raw materials. Its synthesis process was optimized, the chemical structure of product was characterized by FT-IR and 1H-NMR, meanwhile the physical properties was determined.The application of synthetic products in waste paper deinking with flotating method and the comparison of deinking efficiency between the product and mixed deinking agent as well as commercial deinking agent were carried out.The results showed that when the molar ratio of LDEA to IPDI to PEG was 1.0∶2.0∶2.0 synthesis was carried out at 55℃ for 2 h with 1.0% catalyst (on LDEA) the product had the best deinking effect. When m(LIP-600)∶m(AEO-9)∶m(AES)=2∶1∶1 and dosage of LIP-600 was 0.2%, the whiteness of the deinked pulp could reached to 72.3% and the residual ink concentration was 51.4 mm²/m².