Research On Performance Characterization And Personal Moisture Management Of Cotton Spunlace Nonwoven Material

Under the general health environment,consumers have higher requirements for the comfort and dryness of disposable sanitary products,and the research and development of cotton spunlace nonwovens with directional water-conducting properties has attracted attention.In order to explore the effect of fluorine-free finishing agent mass fraction and finishing time on the directional water-conducting properties of cotton spunlace nonwovens,an atomization device was designed in this paper for the preparation of directional water-conducting cotton spunlace nonwovens.The directional water-conducting analysis model of barbed nonwovens provides a theoretical reference for the atomization finishing process parameters and the structural design of directional water-conducting.The photocatalytic process was used to construct hydrophilic channels on the surface of the material after atomization,and a skin-like directional water-conducting cotton spunlace nonwoven was prepared.The influence of the arrangement of hydrophilic channels on the directional water-conducting performance was analyzed.The full text is mainly divided into the following three parts.In the first part,using fluorine-free Zelan R3 as the finishing agent,the 50 g/m~2full-cross plain cotton spunlace non-woven fabric was atomized and finished by the self-made atomizing device,and the directional water-conducting cotton spunlace non-woven fabric was prepared..The effects of Zelan R3 finishing agent mass fraction and atomization finishing time on the material contact angle,liquid dynamic moisture management ability and other performance indicators were analyzed.The results showed that with the increase of mass fraction and atomization finishing time,the contact angle of the hydrophobic surface showed an upward trend at first,and then stabilized after the finishing time reached 14s and 17s,while the contact angle of the hydrophilic surface showed a continuous upward trend.When the mass fraction of finishing agent is 5%and 9%,with the increase of finishing time,the one-way transfer index of material liquid and the comprehensive index of water dynamic transfer show an upward trend,and tend to be stable after finishing time reaches 17s;The scores were13%,17%and 21%,respectively.With the increase of finishing time,the material liquid unidirectional transfer index and water dynamic transfer comprehensive index showed a downward trend.In the second part,the directional water-conducting process of the liquid on the atomized cotton spunlace non-woven fabric is studied,ignoring the liquid evaporation effect,and assuming that the liquid is an incompressible quasi-steady continuous fluid,the directional water-conducting model is constructed,Its dynamic equation is derived.The directional water-conducting process of the material is divided into two stages.Stage I is the permeation process of the liquid under the action of hydrostatic pressure and Laplace pressure;stage II is the diffusion process of the liquid under the capillary driving force after contacting the hydrophilic layer.Using the capillary fractal theory and the Navier-Stokes equations,the kinetic equilibrium equations of each stage are deduced,and the kinetic equations of each stage are analyzed by the method of order of magnitude estimation.The research shows that the contact angle and fractal dimension of the hydrophobic surface are inversely proportional to the penetration rate,and the contact angle of the hydrophilic surface is inversely proportional to the diffusion distance and diffusion rate,which provides a theoretical reference for optimizing the atomization finishing process and improving the structure of directional water conduction.The third part,imitating the structure of human sweat glands,using photocatalysis to construct hydrophilic channels on the surface of the material,developing the preparation technology of skin-like directional water-conducting cotton spunlace nonwovens,and discussing the spacing and distance of the hydrophilic channels.The effect of pore spacing on liquid directional hydraulic performance.Orthogonal experiments were used to explore the best photocatalytic treatment process with the material's liquid penetration time and dynamic moisture management ability as the main test indicators,and to compare the performance differences of the materials before and after catalysis.The results show that when the mass fraction of Ti O₂is 5%,the finishing time is 15 s,the hole spacing is 1.8 mm,and the hole spacing is 7 mm,which are the best process conditions.Under the above process conditions,the liquid breakthrough time of the catalyzed material is reduced by 20 s,the one-way transfer index is increased by 142,and the comprehensive index of liquid water dynamic transfer is increased by 0.085.