硅氧烷低聚物的合成及其在泡沫染色中的应用

Synthesis of siloxane oligomer and its application in foam dyeing

摘要:

摘要：为了通过泡沫染色和光固化改善棉织物的染色性能，合成一种含有不饱和双键的硅氧烷低聚物，设计合适的含有黄色蒽醌染料、硅氧烷低聚体、光引发剂2,4,6-三甲基苯甲酰基-二苯基氧化膦(TPO)、表面活性剂十二烷基硫酸钠(SDS)的泡沫体系对棉织物进行泡沫染色。采用1H-NMR和GPC分析硅氧烷低聚物的化学结构和分子量分布，采用FTIR分析硅氧烷低聚物和染色棉织物的化学结构，采用SEM观察染色棉织物的表面形态。探讨硅氧烷低聚物用量、染料用量、SDS浓度、TPO用量等因素对泡沫性能和染色性能的影响，分析了硅氧烷低聚物的固色机理。结果表明，染液浓度30 g/L、硅氧烷低聚物/染料2:1、SDS浓度2 g/L、TPO用量为染料单体质量的5%、紫外光照时间5 min时，染色织物K/S值可达到5.70，耐皂洗色牢度和干/湿摩擦色牢度级别为4~5级，水接触角为110.1°，紫外防护系数>50。硅氧烷低聚物通过侧基上的不饱和双键发生自由基聚合和硅醇基偶合交联实现固色，并赋予织物良好的疏水性能和抗紫外线性能。

Abstract:

Abstract: In order to improve the dyeing properties of cotton fabric via foam dyeing and photocuring, a siloxane oligomer containing unsaturated double bonds was synthesized. A suitable foam system containing yellow anthraquinone dye, siloxane oligomer, photoinitiator of Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide(TPO), and surfactant of sodium dodecyl sulfate(SDS) for foam dyeing of cotton fabrics was designed. The chemical structure and molecular weight distribution of siloxane oligomers was analyzed by 1H-NMR and GPC. The chemical structure of siloxane oligomer and dyed cotton fabric was characterized by FTIR. The morphology of dyed cotton fabric was observed by SEM. The effects of amount of oligomer, amount of dye, concentration of surfactant, amount of photoinitiator on foam performance and dyeing performance were discussed. The results showed that K/S value of 5.70 , the colo fastness to soaping and to dry /wet rubbing of 4-5, ultraviolet protection factor >50 and water contact angle of 110.1°were achieved under the conditions of the concentration of dye solution of 30 g/L, the ratio of oligomer/dye of 2:1, the concentration of SDS of 2 g/L, TPO amount of 5% on the mass of monomer, and UV irradiation time of 5 min. The siloxane oligomer undergoes radical polymerization through the unsaturated double bonds on the side groups and silanol group coupling and crosslinking to achieve color fixation and gives the fabric good hydrophobic properties and anti - ultraviolet properties.