Synthesis And Application Properties Of Crosslinkers For Crosslinking Dyeing

Crosslinking dyeing can reach high dye fixation on fiber, and dyed fiber has good fastness and finishing property to some degree, which results in its green dyeing trend.In this thesis, a new Williamson etherification route was proposed to prepare polyethylene glycol diglycidyl ether 2-1a-d. The results of DS of epoxy group showed Williamson etherification route yielded polyethylene glycol diglycidyl ether 2-1a-c with ideal DS of epoxy group, especially 2-1b with DS about 2.0. The new synthesis route has many merits, such as high yield, high DS of epoxy group, simple procedure, and lower cost.Allylsucrose was prepared by allyl etherification from sucrose which is biomass resource. Activating alkali and allyl etherification reagent were well-chosen. Acceptable product was obtained when sodium hydroxide replaced sodium hydride and allyl chloride replaced allyl bromide, which results in that the cost was decrease 90%. A lot reaction factors, involving activation temperature, activation time, reaction temperature, reaction time, the amount of solvent, were investigated in detail. Peroxyacetic acid was prepared from hydrogen peroxide and acetic acid in the presence of sulfuric acid at room temperature. Sucrose epoxy resin 2-2 was prepared by epoxidation using peroxyacetic acid. The effect of the ratio of hydrogen peroxide to double bond of allyl group, reaction temperature and reaction time on epoxidation was investigated.Polyethylene glycol diglycidyl ether 2-la-d and sucrose epoxy resin 2-2 were applied in crosslinking dyeing of the blue tetraethylene pentamine dye and the yellow polyvinylamine dye on cotton and silk. The dip-pad process was employed as fixation procedure. The results of dye fixations demonstrated that the fixation of the epoxy resin crosslinkers reached 97% and 99% on cotton and silk respectively.Ammonolysis reaction of cyanuric chloride was employed to synthesis anionic water-soluble crosslinkers 3-1, 3-2, 3-3 and 3-4, and alcoholysis reaction of cyanuric chloride was employed to prepare nonionic water-soluble crosslinker 3-5a-d. The structures of cyanuric chloride-based crosslinkers were characterized by IR, ~1H NMR and MS spectroscopy.Anionic and nonionic cyanuric chloride-based crosslinkers 3-1, 3-2, 3-3, 3-4 and 3-5a-d were used in crosslinking dyeing of the blue tetraethylene pentamine dye and the yellow polyvinylamine dye on cotton and silk. The dye fixations of the both dyes reached 99% oncotton and silk. In view of many factors, crosslinker 3-1 has the advantage over other anionic crosslinkers, and crosslinker 3-5b is the best one among these nonionic crosslinkers.The covalent bond among fiber, the crosslinking dyes and crosslinkers was revealed by DMF bleeding method and IR spectra of fiber, dyed fiber and crosslinking dyed fiber. The fixation comparison of the blue dye on cotton and polypropene, and imprecise mathematical calculation, indicated that reasonable linkage among them was covalent bond which was formed by a macro-dye formed from many dye molecules at first linked to fiber by crosslinkers. Crease-proof performance and tensile strength retention of crosslinking dyed fabrics were studied under different concentrations of crosslinkers. The results revealed crosslinking dyed fabrics was endowed with crease-proof properties to some degree, and the strength of fabrics was decreased due to crosslink. The hydrolysis of crosslinkers was testified to be very weak by the calculation of hydrolysis kinetics of dichloro-s-triazine and reuse times of crosslinkers, which indicated that crosslinking dyeing was promising process in this field.