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The core waterborne polyurethane (WPU) is modified by methyl methacrylate (MMA). Taking the solid content and water absorption as evaluation indexes, the optimal modification conditions are determined by orthogonal test. The optimal modification conditions are as follows: the mass ratio of MMA to WPU is 1.5:1.0, the reaction time is 4h, and the reaction temperature is 70 t. Microcapsules are prepared by interfacial polymerization. The results show that when the content of waterborne polyurethane is 10% and emulsifier is 1.2%, the encapsulation rate and permeability of microcapsules are the best. [ABSTRACT FROM AUTHOR]

In order to develop an AOX-free modification technology for wool, sodium isocyanate was used to react with hydrogen peroxide to produce percarbamic acid, which can change the structure and properties of wool. Felting property, SEM and AllwÖrden reaction, whiteness, wettability and the dyeing properties of acid dyes were measured. The results showed that sodium cyanate can react with hydrogen peroxide to generate percarbamic acid, which has a strong oxidation and activate the process on oxidative modification of wool. The scales of wool fiber and the surface cell membrane were corroded and damaged after treatment, which can decline shrinkage of wool, and improve the initial dyeing rate and dye uptake, as well as the whiteness and wetting properties of wool fibers. [ABSTRACT FROM AUTHOR]