What is the role of wetting and penetration?

Penetration is a more important role in the refining process. One is that during the growth of cotton, the galacturonic acid of the pectin material slowly combines with Ca2+ and Mg+ in the groundwater to form pectinate, which is insoluble in water and difficult to expand. Pectin is distributed on the primary wall on the surface of the cellulose, hindering the hygroscopicity of the inner wall which accounts for 98% of the cellulose. The waxy substance in the cotton fiber and the oily dirt in the remaining slurry make it difficult for the scouring liquid to penetrate into the fiber yarn gaps composed of mutually connected capillaries of different sizes.

Second, the scouring process is carried out in a certain concentration of caustic soda solution. Due to the high surface tension of the caustic soda solution, the penetration of the scouring solution becomes difficult. In order for the scouring to proceed smoothly, it is necessary to expand the fiber and improve the interface properties between the solution and the fiber, that is, it is necessary to add an appropriate surfactant that can reduce the surface tension of the solution and the interfacial tension between the solution and the fiber, so that the fiber and the scouring liquid More and better contact to accelerate wetting and penetration.

According to the basic theory of wetting and permeation, the surface active agent can greatly reduce the free energy of the liquid surface and the free energy of the liquid/solid interface through adsorption on the interface, making the wetting easier. At the same time, the static pressure of the rising liquid column of the capillary can be increased, which is beneficial to the penetration of the scouring liquid into the fiber. The quality of the scouring agent depends largely on its ability to reduce surface tension and penetration rate.

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