① Unable to achieve the desired tactile sensation: The soft style of soft finishing varies depending on customer requirements, such as softness, smoothness, fluffiness, softness, oiliness, dryness, etc. Different softeners are selected according to different styles. In soft films, there are different structures of softener soft films, which have different degrees of softness, fluffiness, smoothness, yellowing, and affect the water absorption of fabrics; In silicone oil, the properties of modified silicone oil with different modification genes are also different, such as amino silicone oil, hydroxyl silicone oil, epoxy modified silicone oil, carboxyl modified silicone oil, etc.

② Color change and yellowing: Generally caused by the presence of amino groups in certain structured soft films and amino silicone oils. In soft film, cationic soft film is soft and has a good hand feel. It is easy to adsorb on fabrics, but it is prone to yellowing and discoloration, which affects hydrophilicity. If cationic soft film is modified into soft oil powder, its yellowing will be greatly reduced and hydrophilicity will also be improved. For example, by compounding cationic soft film with hydrophilic silicone oil or hydrophilic finishing agent, its hydrophilicity will be improved.

Anionic or non-ionic films are not prone to yellowing, and some films do not yellowing and do not affect hydrophilicity.

Amino silicone oil is currently the most widely used silicone oil, but amino groups can cause discoloration and yellowing. The higher the ammonia value, the greater the yellowing. Low yellowing amino silicone oil or polyether modified, epoxy modified silicone oil that is less prone to yellowing should be used instead.

In addition, cationic surfactants such as 1227, 1831 and 1631 are sometimes used as emulsifiers in lotion polymerization, which will also cause yellowing.

The use of different emulsifiers during silicone oil emulsification results in different "color stripping effects", which can cause color stripping under different conditions and result in a lighter color, which is already considered a color change.

③ The decrease in hydrophilicity of fabrics is generally caused by problems with the structure of the soft film used and the lack of water absorbing genes after silicone oil film formation, as well as the closure of water absorbing centers such as hydroxyl groups on cellulose fibers, carboxyl groups, and amino groups on wool, resulting in a decrease in water absorption. Anionic and non-ionic soft films and hydrophilic types of silicone oil should be selected as much as possible.

④ Dark spots: The main reason is that the oil stains on the fabric were not completely removed during pre-treatment, and the color of the oil stains was darker during dyeing; Or there is too much foam in the dyeing bath, and the mixture of foam and fancy sweater, dye, etc. is stained on the fabric; Or defoamer floating oil causes dark oil spots; Or tar like substances in the dyeing vat sticking to the fabric; Or dyes aggregate into dark colored spots under different conditions; Or due to excessive calcium and magnesium ions in water, which bind with dyes and stick to fabrics. Targeted treatment should be carried out, such as adding degreasing agents for refining during pre-treatment, using low foaming and non foaming dyeing agents, selecting defoamers that are not prone to oil floating, adding chelating agents to improve water quality, adding solubilizing and dispersing agents to prevent dye aggregation, and using cleaning agents for tank cleaning in a timely manner.

⑤ Light colored spots: The main reason is uneven pre-treatment, with poor hair effect in some areas, resulting in a certain degree of dye rejection, or containing dye rejection substances, or with calcium soap, magnesium soap, etc. on the fabric during pre-treatment or uneven silk gloss, or uneven drying of semi-finished products, or solid particles such as undissolved elemental powder and soda ash on the fabric surface, or dripping water before drying the dye, or auxiliary spots caused by post-treatment such as softening of the dye. Similarly, targeted treatment is necessary, such as strengthening pre-treatment. When selecting pre-treatment additives, it is necessary to avoid the formation of calcium magnesium soap, and the pre-treatment must be uniform and thorough (which is related to the selection of refining agents, penetrating agents, chelating dispersants, sericulture penetrating agents, etc.). Yuanming powder, soda ash, etc. must be well processed and put into the tank, and production management work must be strengthened.