Application of Polyethylene Glycol in Textile Auxiliaries

The difference in wettability between PEG400 and PEG600 in textiles is mainly due to their different molecular weights. Specifically, the molecular weight of PEG400 is smaller than that of PEG600, which means that the molecular chain of 400 is shorter. Generally speaking, PEG with smaller molecular weight has better water solubility and lower melting point. This usually translates into better permeability and wettability. Therefore, 400 may be more suitable for textiles than 600 because it is easier to diffuse and penetrate into the interior of fibers.

1. Wetting performance: Due to the low molecular weight and good water solubility of PEG400, it may effectively reduce the surface tension of water, thereby improving the wetting speed and uniformity of textiles, making PEG400 an effective wetting agent and processing aid. It helps to achieve uniform distribution of dyes or chemicals in textiles.

2. Penetration ability: For applications that require deep penetration, such as processing, dyeing, or finishing processes. Due to its smaller molecular structure, PEG400 may be easier to penetrate into the microporous structure of fibers, promoting the deep penetration of subsequent treatment solutions. On the other hand, PEG600, due to its larger molecular weight, may play a role more on the surface or shallow layer of fibers, resulting in relatively lower permeability.

3. Application selection: It is crucial to choose the appropriate PEG type based on the specific needs of the textile. If the goal is rapid and deep wetting and penetration, PEG400 may be more suitable. If it is for providing some lubrication, anti-static effect on the surface, or slight modification, PEG600 may be more suitable.