Synthesis of amino-terminated hyperbranched polymers and their application in microfiber synthetic leather base dyeing

In the current study, amino-terminated hyperbranched polymers (NH2-HBP) were synthesized by Michael addition reaction in which N, N'-methylene bisacrylamide (MBA) and diethylene triamine (DETA) were used as raw materials, and water was used as a solvent. Reaction temperature, raw material ratio, and reaction time were optimized via single-factor experiments in which the production rate and primary amino content were used as indexes. The results showed that the mol ratio of MBA to DETA was 1:1.1, the temperature was 70 degrees C, and reaction time was 24 h. Under this condition, the primary amino content of NH2-HBP was 2.83 mmol/g, and the yield was 91.16%. The NH2-HBP structure was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Moreover, the relative molecular mass distribution of NH2-HBP was also determined by gel permeation chromatography. As an active substance, NH2-HBP was grafted onto the polyamide microfiber synthetic leather used in clothes, and organic phosphine was used as a cross-linking agent. The change in dye uptake, surface chroma, and resistance to dry-rub and wet-rub fastness properties was discussed. When the NH2-HBP dosage was 5.5%, the dye uptake improved from 56.89% to 94.85% (an increase of almost 61%). The surface chroma also deepened, the dry-rub fastness improved from 3.0 to 4.5, and the wet-rub fastness improved from 2.5 to 3.5.