Explore the production process and performance characteristics of thermoplastic polyurethane meltblown nonwovens

Melt-blown nonwoven fabric is composed of ultra-fine staple fibers, and the fibers are uniformly distributed in a staggered state, so the difference in strength in the vertical and horizontal directions is small, the pore size of the fabric is small, and the specific surface area is high, and because of its high production efficiency and production cost Low, so meltblown nonwovens are widely used in the filtration industry. Biomass graphene carbon molecular sieve is prepared by hydrothermal synthesis method, and it is added to spunbonded nonwoven fabric to prepare biomass graphene spunbonded nonwoven fabric. The filtration efficiency is 31% higher than that of ordinary spunbonded nonwoven fabric. . The filter paper and the meltblown layer of the meltblown composite material are combined with a layer of point-bonded hot-rolled spunbond fabric, which greatly improves the strength and wear resistance of the composite filter material. Thermoplastic polyurethane (TPU) is a linear copolymer containing -NH-COO- groups in the molecule. The unique chain structure and aggregate structure of polyurethane give it excellent physical properties and processing properties (such as good elasticity, high strength, good toughness, Wear resistance, low temperature resistance and oil resistance, etc.), are widely used in all aspects of industrial and agricultural production. In addition, based on the excellent physical properties of polyurethane, many researchers have also carried out related functional research. Based on the excellent physical properties of polyurethane, a transparent fluorine-containing polyurethane coating was prepared. This coating has low surface energy and excellent weather resistance, and can be used in aviation and military fields. The thermoplastic polyurethane composite system reinforced by functionalized graphene nanosheets was studied. The study found that the addition of functionalized graphene significantly improved the mechanical properties, thermal stability and shape memory of the composite system. Designed and realized the preparation of a new type of elastic polyurethane/graphene piezoelectric material. The application of thermoplastic polyurethane to meltblown technology can develop elastic meltblown nonwovens with excellent toughness and stretchability. It can not only be widely used in the filtration industry, but also can be used to manufacture elastic waistbands, gloves, medical bandages, etc. Expanded the application fields of meltblown nonwovens. However, there are few reports on the research of meltblown TPU nonwovens. The processing and development process of thermoplastic polyurethane (TPU) meltblown nonwovens are introduced. The melt index (MI) test has established that the spinning temperature range of meltblown TPU nonwovens is 215～225℃. The influence of the wind pressure and temperature of the drafting hot air on the microstructure and properties of the meltblown TPU nonwoven fabric is mainly discussed. When the wind temperature is constant, the fibers of the meltblown TPU nonwoven fabric become thinner with the increase of the drafting wind pressure. When the wind pressure is constant, the wind temperature of the drafting airflow is increased, and the adhesion between the fibers in the web is strengthened. . The change of microstructure significantly affects the mechanical properties, air permeability and filtration properties of the meltblown TPU nonwoven fabric. When the air temperature is fixed, the hot air pressure increases with the drafting, and the breaking strength and bursting strength of the TPU meltblown nonwoven material increase, and the filtration efficiency is improved, but its air permeability decreases; when the air pressure is fixed, the hot air As the wind temperature increases, the breaking strength, bursting strength, filtration efficiency and air permeability of TPU meltblown nonwovens show the same changing trend as the wind pressure increases.