骨架纤维含量对复合保暖絮片结构与性能的影响OA

To meet the demand for lightweight and durable thermal clothing in extremely cold environments,high-performance thermal insulation wadding materials characterized by lightness,warmth retention,and high resilience have attracted widespread attention.Thermal insulation wadding materials have a unique porous structure capable of trapping a large amount of static air to achieve efficient thermal insulation,while also offering advantages such as ultra-low density,lightweight properties,and softness,thereby overcoming the traditional challenge of"balancing lightweight design with high thermal insulation."However,most existing studies focus on the influence of material types and ratios on wadding performance,lacking in-depth analysis of the heat transfer mechanism.In particular the impact of material ratios on wadding structure and the relationship between wadding structure and performance remain unclear. To improve the cold-proof,thermal insulation and compression resilience properties of the wadding,and to clarify the influence of raw material types on the structure and performance of the wadding,this paper selected three-dimensional crimped hollow polyester fibers and ordinary polyester fibers as the skeletal fibers to support the wadding while imitation down ultra-fine polyester fiber I and imitation down ultra-fine polyester fiber II were used as filling fibers to occupy the internal pores of the wadding.A series of composite thermal insulation waddings were prepared using hot air bonding technology.Based on the characterization of the wadding structure and properties,combined with heat transfer theory analysis,the relationship between the mass fraction of skeletal fibers and the structural and performance parameters of the wadding such as Clo value,thickness and porosity was established.A lightweight highly elastic and high thermal insulation performance wadding was prepared,providing guidance and reference for the research and development of new thermal insulation fiber materials.The study found that:the porosity of the wadding was positively correlated with the mass fraction of skeletal fibers,and the critical porosity of the wadding was 99.13％;the thickness and air permeability of the wadding showed a gradual increasing trend with the increase of skeletal fiber content;the thermal insulation performance of the wadding first increased and then decreased with the increase of skeletal fiber content.When the porosity of the wadding was less than the critical porosity,heat transfer in the wadding was mainly through heat conduction;when the porosity was greater than the critical porosity,air convection occurred in the wadding,and heat transfer in the wadding was mainly through heat conduction and convection;the maximum compressive stress,compressive modulus and compression resilience rate of the wadding were all positively correlated with the content of skeletal fibers;when the content of skeletal fibers was 24％,the Clo value of the wadding reached the maximum 4.02,and the compression resilience rate reached 95.29％.Meanwhile after 500 compression cycles,the compression resilience rate of the wadding decreased by only 1.03％. The demand for high-performance thermal clothing continues to grow,and the development of new chemical fiber composite thermal wadding will receive increasing attention.The research results provide guidance and reference for the study and development of new thermal insulation wadding materials.