Modification of Sodium Lignosulfonate and Evaluation of its Potential Use as Detergent Builders

Sodium lignosulfonate (LS) was modified by polypropylene glycol diglycidyl ether (PPGDE) for the preparation of a surfactant (GLS), and firstly used for detergent builder. The effects of PPGDE content on the reaction and the properties of GLS were investigated. The structure of GLS was studied by Fourier transform infrared spectra (FTIR), ultraviolet spectrophotometer (UV), and gel permeation chromatography (GPC). The surface tension, critical micelle concentration (CMC), emulsifying ability, lime soap dispersing power (LSDP), and detergency were characterized. The results showed that GLS had higher surface activity and better emulsifying ability, LSDP, and detergency than that of LS. After decolorized by H₂O₂, the whiteness retention value of decolorized LS on white cloth reached 91.9%, while that of decolorized GLS increased up to 99.4%. These results suggested that the decolorized GLS may provide a new perspective for detergent builders.

以聚丙二醇二缩水甘油醚（PPGDE）对木质素磺酸钠（Sodium lignosulfonate，LS）进行改性，制备得到表面活性剂产物GLS，并将其首次应用于洗涤剂助剂领域。考察了PPGDE用量对反应过程及GLS性能的影响。采用傅里叶变换红外光谱（FTIR）、紫外分光光度计（UV）及凝胶渗透色谱（GPC）对GLS的结构进行了表征分析。对产物的表面张力、临界胶束浓度（CMC）、乳化能力、钙皂分散力（LSDP）与去污力进行了性能测试。结果表明，相较于原始LS，GLS具备更优异的表面活性、乳化能力、钙皂分散力及去污力。经过氧化氢（H₂O₂）脱色处理后，脱色LS在白布上的白度保留率可达91.9%，而脱色GLS的白度保留率最高可达99.4%。上述结果显示，脱色GLS可为洗涤剂助剂的开发提供全新的研究思路。