In the spinning engineering of synthetic fibers such as polyester, polypropylene and polyurethane which are polymerized by monomers, spinning oils (commonly known as chemical fiber oils) are needed. These oils can adjust the friction characteristics of the fibers, prevent or eliminate the accumulation of static electricity, give them smooth and soft properties, improve the cohesion of the fibers, protect the strength of the fibers, reduce the breakage rate, and make the chemical fibers pass through spinning and drawing smoothly by flexible spinning, weaving and other processes. Although these oils play an important role in the front-end spinning process of synthetic fibers, they will cause uneven reduction or poor effect, uneven dyeing or stain spots in the following processes such as alkali reduction, dyeing, printing and finishing, which require a large number of chemicals to remove. In addition to some acids and bases, these oil additives also need a large number of surfactants to assist, commonly known as degreasers, and polyester oil removers account for the largest proportion, so today we will talk about polyester oil removers in detail.
Polyester oil removers can be divided into high temperature oil removers and low temperature oil removers according to the process. High temperature oil removers are relatively mature at present. According to the principle of action, they can be divided into three categories: the first is alkaline oil removers, similar to the biochemical TF-101 series. This product is mainly used in shuttle fabrics of polyester chemical fibers. When used for alkali deweighting, it integrates desizing and refining, while knitted fabrics generally do not need alkali degreasing (except superfine denier fibers and island fibers). The second principle is that the degreasers in the same bath of refining and dyeing are now on the market needing products owning very good dispersibility. They can disperse the degreased oil in water without affecting dyeing. The new products developed on the principle of similarity and compatibility are the best. The third is extraction, similar to the use of carbon tetrachloride and other products to absorb oil, but this method is seldom used at present. High-temperature oil removers has mature technology and simple surfactant. At first, NP, sulfonic acid, 6501 and other products were used. Later, due to environmental protection requirements and the improvement of customer performance requirements, it was replaced by isomeric alcohol ethers such as AEO, SAS-60, C13 and EH.
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