Microcapsules are small particles that can effectively protect a core material from degradation. Microcapsules with double capsule walls can improve stability and reduce breakage due to the fact that the physical and chemical properties of double-walled materials can complement each other, thus enhancing the quality and applicability of a microcapsule. Microcapsules can achieve controlled release of core materials by using a temperature-sensitive wall material. In this research, gelatin was used as the inner wall material for these double-walled microcapsules. The outer wall material was a composite material prepared by the reaction of a hydroxyl group in gum arabic with an amino group in N-isopropylacrylamide (NIPAM) in the presence of N, N’-methylene bisacrylamide (BIS), while lavender fragrance oil served as the core material. A complex coalescence method was used for the preparation of microcapsules with double capsule walls. The effects of different proportions of gum arabic to NIPAM on the core loading, microcapsule yield and thermal stability of microcapsules were studied in detail. Additionally, the stability of these fragrance microcapsules with double capsule walls in different solvents and pH values was evaluated. The sustained release properties and mechanism of cotton fabrics treated with prepared fragrance microcapsules were investigated. The results show that the microcapsules prepared with a 10:1 ratio of NIPAM to gum arabic have good temperature responsiveness. Therefore, clothing treated with microcapsules with temperature-sensitive wall materials can ensure that the human body has a fresh and pleasant smell in the case of perspiring in summer.
采用丙烯酰胺、甲基膦酸(5-乙基-2-甲基-氧代-1,3,2-二氧磷杂环己-5-基)甲基甲基酯和N-苯基马来酰亚胺构建了新型磷-氮协同阻燃体系,并用于涤棉织物阻燃整理.结果表明:与原涤棉织物相比,阻燃整理后的织物LOI值从19.5%提升至33.3%,熔滴现象明显改善,阻燃等级达到B1级,峰值热释放速率和总热释放量分别降低了22.63%和16.48%,且织物力学性能未受明显影响.阻燃机理研究表明:阻燃涤棉织物表现出不同程度的屏障效应、火焰抑制效应以及促进成炭效应,其中火焰抑制效应最强,燃烧后生成的炭层致密性和连续性明显提高.
将实验室自制的含磷、氮、硫的阻燃聚酯二醇(SPAE)和氟化的拒水二醇(DFEA)分别作为软段和硬段,通过乳液聚合制备出拒水-阻燃水性聚氨酯(SPDF-WPU),并将其涂覆在锦纶织物上.测试结果表明,SPDF-WPU涂层织物的LOI、余焰时间、余辉时间和损毁长度分别为28.6%、4.6 s、0 s、11.2 cm.织物与水的静态接触角达到127.3°,拒水评分达到90分.即使经过10次洗涤,涂层织物仍然表现出良好的阻燃性、抗滴落性以及拒水性.通过结合不同温度下气态产物的光谱分析,系统地探究了SPDF-WPU的阻燃机理,发现P、N和S元素通过生成不可燃气体化合物、释放自由基、脱水和炭化,在气相和凝聚相中发挥协同阻燃作用.
The self-made hydrophobic SiO2 aerogel is uniformly coated on the polyester fabric by polyacrylic ac-id adhesive.It is found that when the mass fraction of aerogel is 4％,the polyester fabric can be given better thermal insulation properties,and the tensile breaking strength of the finished fabric has little change.
Long chain degraded chitosan quaternary ammonium salt(HDCC-β-CD)are prepared by the degra-dation of chitosan,2,3-epoxy propyl dodecyl dimethyl ammonium chloride(GTMAG),epichlorohydrin and β-cy-clodextrin(β-CD)as raw materials.The product is characterized by FTIR,XRD and XPS.As an antibacterial agent,the application of HDCC-β-CD to linen fabric treatment is carried out.At the same time,comparative study is undergone of antibacterial finishing properties of linen fabrics with HDCC-β-CD and immobilization of short chain degraded chitosan quaternary ammonium salt β-cyclodextrin(HTCC-β-CD).The results show that HDCC-β-CD has better antibacterial performance and washing durability on linen fabric than HTCC-β-CD.And when the fixed load is 19.48 μmol/g,the minimum inhibitory concentration of HDCC-β-CD against S.aure-us and E.coliis 10 g/L.
