With the rise of nonwovens, the hydrophilic finishing of nonwovens has also developed to some extent, but it mostly follows the principles and methods of traditional textile finishing, and the finishing range is extended from taking to medical, sanitary and household use of various wiping cloth and industry. Especially for the baby pants industry, its role is beyond doubt. However, in order to be better applied to baby pants, the hydrophilic properties of nonwovens can be improved from two aspects. Fiber modification in the spinning stage: precursor modification, hydrophilic, hydrophilic monomer grafting modification, nonwovens compounded with hydrophilic fibers, with rough and irregular fiber surface. Hydrophilic finishing of nonwovens surface: hydrophilic polymer adsorbs, fixes, forms film on the surface of nonwovens fiber, and grafts and polymerizes hydrophilic monomers.
Surface hydrophilic finishing refers to coating a layer of hydrophilic compound on the surface of fiber or fiber products to improve the hydrophilicity of fiber. Generally speaking, for alkene fibers with non-polar groups, the classification of surface hydrophilicity can adopt the composite system of different types of surfactants and various surfactants. The characteristic of this method is that the hydrophilic classifier does not FORM chemical bond association on the surface of fiber macromolecules. Because sanitary materials have one-time characteristics, low requirements for hydrophilicity and durability, simple surface hydrophilic finishing method and low cost, they can basically maintain the hydrophobicity of the fabric and increase the water permeability and softness of the fabric, so they are often used in practical production.
The finishing agents involved in hydrophilic finishing mainly include anionic surfactants and cationic surfactants. For example, the double chain surfactant studied by scholars in recent years, its molecular structure contains two hydrophilic groups and the same number of lipophilic chains. No matter what kind of surfactant, its polymer is composed of two groups with different properties, one is nonpolar hydrophobic lipophilic group, the other is polar hydrophilic lipophilic group. The so-called amphiphilic structure means that its macromolecules have both hydrophilicity and lipophilicity.
Precursor modification is a modification method to improve the hydrophilic properties of fibers by adding hydrophilic substances such as polyethylene glycol and sulfonic acid group in the spinning solution. However, this method will affect other properties of the fiber and has certain limitations. Surface graft polymerization is caused by high-energy radiation (electron beam, ultraviolet) radiation or chemical reagents, which produces free radicals on the fiber surface and increases hydrophilicity. The hydrophilic treatment of fiber surface is to cover the hydrophilic agent on the fiber surface to form a hydrophilic film and improve the hydrophilic performance.
Both baby pants and the whole health industry pay special attention to the advantages and disadvantages of hydrophilic performance. Therefore, taking hydrophilic finishing seriously is the best choice to improve hydrophilic properties.