Different nonwoven processes affect the properties of diaper pails and sanitary napkin surface materials. The non-woven fabrics on the surface of disposable sanitary materials mainly include production processes such as hot air bonding and spunlace entanglement. With the development, hydrophilic finishing is also more applied to non-woven fabrics, but most of them follow the principles and methods of traditional textile finishing, and the scope of finishing is getting wider and wider. At present, how to improve the hydrophilic properties of non-woven fabrics can be started from the following two points. Fiber Spinning Modification: Hydrophilic modification of precursor or graft modification of hydrophilic groups, orifice modification to make the fiber surface rough and irregular; Nonwoven surface hydrophilic finishing: Hydrophilic polymer It is fixed on the surface to form a film, and the hydrophilic monomer is grafted and polymerized.
Precursor modification is a modification method that improves the hydrophilicity of fibers by adding hydrophilic substances to the spinning solution. Surface graft polymerization is caused by high-energy radiation or chemical reagents, generating free radicals and increasing hydrophilicity. Surface hydrophilic finishing refers to applying a layer of hydrophilic polymer on the surface of fibers or fiber products to improve the hydrophilicity of fibers.
A kind of surfactant called cation, its hydrophilic group is mostly ammonium salt. Cationic surfactant is a commonly used antibiotic, not suitable for diaper pails or the hydrophilic agent of nonwovens on the surface of sanitary napkins.
There are not only cations but also anions, the surface active fragments of zwitterionic surfactants have isoelectric point zwitterions and medium pH changes and pH sensitivity, and its advantage is that it has good matching with other types of surfactants. Nonionic surfactants can remain non-ionized in water, so they have good compatibility, strong electrolyte resistance, and are characterized by high activity in water. The temperature of the polyoxyethylene ether type nonionic surfactant in water decreases with the increase of temperature, and the surface activity increases. It is currently replacing the more toxic phenolic ether surfactants.
The molecular structure of polyester hydrophilic finishing agent includes polyester segment and polyether segment. On heating, the segments between the aromatic rings are stretched. Polyester segments are similar to polyester fibers, dissolve, melt and crystallize. When the temperature drops, the segments shrink and the polyester segments are tightly bound to the fibers. However, its high price is not conducive to controlling production costs.
The molecular structure of the polymer contains polyoxyethylene ether bonds, which are catalyzed by the ring-opening of epoxy groups, cross-linked to form ether bonds after heating, and form a hydrophilic film on the surface, which is hygroscopic. However, this finishing agent is toxic, so from the perspective of human safety and environmental protection, its use is not recommended.
Polysiloxane hydrophilic finishing agent is a multifunctional textile finishing agent, which not only has the functions of moisture absorption and water absorption, but also has antifouling, soft and antistatic functions. Not only does it condense into a film, but it also crosslinks with the fibers, further improving durability. The water-soluble hydrogen-containing polyether-modified polysiloxane can greatly reduce the surface resistance of the material, greatly improve its washing resistance, and endow the material with good softness.
In addition to the above diaper pails hydrophilic finishing agents, there are also polyurethane-based hydrophilic finishing agents, polyacrylate-based hydrophilic finishing agents and chitosan-based hydrophilic finishing agents. Different types have different characteristics, so it is necessary to select suitable materials according to the performance characteristics of the product.
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