关键词: 聚氨酯, 发泡涂层, 墙布, 隔音性能, 剥离牢度

Abstract:  In recent years, coating finishing has become one of the important methods of functional finishing of textile materials. Coating finishing is to evenly coat the surface of the fabric with a layer of polymer compounds that can form a film, so as to change the performance and style of the fabric and improve the added value of the textile. At present, among many coating materials, water-based coating materials stand out because of their environmental protection. Specifically, waterborne polyurethane (PU) coating is a high-quality coating material with high tensile strength, good elasticity and amphiphilicity. It can be used in foaming preparation process, and the foam coated fabric is widely used. For example, soft foam is used as the padding of vehicles, rooms and clothing, and hard foam is used as heat insulation, sound absorption, packaging, insulation and low foaming synthetic wood. Therefore, it is feasible to finish the fabric with foaming coating to make it obtain a relatively soft structure and improve its sound insulation performance.
In order to develop a multi-functional wall fabric with sound insulation and noise reduction, the warp knitted polyester fabric was waterproofed by padding process to obtain a certain hydrophobicity and the polyurethane (PU) foam coating was used for waterproofing functional finishing of base fabric. The effects of different preparation process parameters on the peeling fastness and sound insulation performance of the coated fabrics were explored, and the application advantages of PU foam coated fabrics as wall covering fabrics were analyzed. The results show that when the dosage of PU in the coating slurry formulation is 100 g, the mica powder is 30 g, and the thermally expandable microspheres are 2 g, the baking temperature is 170 °C, the baking time is 60 s, and the knife distance is 0.58 mm, the PU foamed coating fabric is prepared, the peeling fastness of PU foaming coating fabric is 17 N, the average sound insulation amount could reach 26 dB, and the coating peeling fastness and sound insulation performance reach the best.
In the future, wall cloth will gradually replace wallpaper, and consumers have more and more requirements for the performance of wall cloth, such as waterproof, insect control, environmental protection, sound absorption and other versatility. At the same time, consumers are more looking forward to the safety of decoration, anti-fouling and easy scrubbing, antibacterial and mildew resistance, and the diversification of colors and patterns of wall cloth. In conclusion, this kind of waterproof, soundproof and noise reduction multifunctional coated fabric has a broad application prospect in the wall covering market.

Key words: polyurethane, foam coating, wall covering, sound insulation performance, peel fastness