Construction of a Novel Substrate of Unfigured Islands-in-Sea Microfiber Synthetic Leather Based on Waste Collagen

Abstract

This study is to introduce waste collagen into an unfigured islands-in-sea microfiber nonwoven material, replacing the polyurethane impregnation section of the traditional manufacturing process with the collagen impregnation process. The modified collagen was first impregnated in polyamide/lowdensity polyethylene (PA/LDPE) fiber nonwoven to form a film. Then the low-density polyethylene component was extracted and dissolved in toluene, resulting in a collagen-based microfiber nonwoven substrate. Waste collagen was first modified to introduce CC into the molecular chain to obtain vinyl collagen (CMA), and then the following film formation conditions for CMA were studied: 73% degree of substitution (DS), 3 h cross-linking time, and 0.005−0.01 wt % initiator concentration. Then, the preparation of CMA-PA/LDPE and toluene extraction processes were investigated. The optimum toluene extraction conditions were obtained as an extraction temperature of 85 °C and an extraction time of 110 min. The properties of the nonwoven materials were compared before (CMA-PA/LDPE) and after (PA-CMA) extraction. It was found that the homogeneity, tensile strength, and static moisture permeability of the PA-CMA materials prepared by CMA with 50 and 73% DS were all superior to those of PA/ LDPE. In particular, the static moisture permeability of PA-CMA (691.6 mg/10 cm 2 •24 h) increased by 36.2% compared to the microfiber synthetic leather substrate currently in the market. Using scanning electron microscopy (SEM), the continuity of a film of PA-CMA with 73% DS was observed to be better and the fibers were differentiated and relatively tighter fiber-to-fiber gap. The studied novel green process can eliminate the large amount of dimethylformamide (DMF) pollution caused by the current solventbased polyurethane impregnation process.

Development of Leather Fiber/Polyurethane Composite with Antibacterial, Wet Management, and Temperature-Adaptive Flexibility for Foot Care

“…This is because the porous structure in the fibrous layer of LF/PPU provides channels for water vapor. Although the WVTR of LF/PPU is lower than that of cotton (Figure d), LF/PPU has a higher moisture regain ratio (Figure e) due to its hydrophilicity and water absorption ability (Figure S7). Additionally, LF/PPU has a higher moisturizing retention ability than cotton.…”

Construction of Unsaturated Collagen Microsphere System Based on Hydrogen/Coordination Bond and Application

“…The conical flask with a stopper was then placed in a constant temperature magnetic stirrer with a water bath at 70 °C and stirred for 30 min until dissolution. Then the temperature of the thermostatic magnetic stirrer was lowered to 50 °C and 1.2 mL of methacrylic anhydride was slowly added to the conical flask at a rate of 1 mL/min after 20 min of temperature stabilization, and the reaction was carried out for 2 h. The well-reacted solution was poured into a dialysis bag with an MWCO of 500 D and then put into deionized water for 24 h. After removal, the sample was freeze-dried for 12–24 h. The dried sample was placed in a desiccator and set aside. − …”

Asymmetrically Wettable, PET/PA6, Hollow, Segmented-Pie, Microfiber Nonwovens for a Synthetic Leather Base

“…Existing microfiber manufacturing methods include direct spinning [ 1 , 2 ], conjugate spinning (islands-in-sea type [ 3 , 4 , 5 ], split type [ 6 , 7 , 8 ], and multi-layer type [ 9 , 10 ]), and random spinning (melt blowing [ 11 , 12 , 13 ], spun bonding [ 14 , 15 , 16 ], flash spinning [ 17 , 18 ], and electrospinning [ 19 , 20 , 21 ]). Among them, the islands-in-sea bicomponent spinning is a technique that can rapidly and efficiently prepare microfiber nonwovens, which has received widespread attention in the industry and has become the main approach for producing microfiber synthetic leather bases.…”