Views: 0 Author: Site Editor Publish Time: 2021-05-18 Origin: Site
Dyeing fastness (abbreviated as color fastness) means that the dyed fabric is subjected to external factors (extrusion, friction, washing, rain, exposure, light, sea water immersion, saliva immersion, water stains, sweat stains, etc.) during use or processing. Etc.) The degree of fade under the action is an important indicator of the fabric.
This passage is going to talk about the following questions of the wet rubbing fastness improver:
(1) Wet rubbing fastness improver for dyeing fabric
(2) Why test the color fastness?
(3) The importance of using wet rubbing fastness improver
We need to use wet rubbing fastness improver for dyeing fabric.
Dyeing is a process in which dyes and fibers are physically or chemically combined, or chemical methods are used to generate pigments on fibers, so that the entire textile has a certain color. Dyeing is carried out under certain conditions of temperature, time, pH value and required dyeing auxiliaries. The dyed product should have uniform color and good color fastness. The dyeing method of fabric is mainly divided into dip dyeing and pad dyeing. Dip dyeing is a method in which the fabric is immersed in a dye liquor to gradually dye the fabric. It is suitable for dyeing small batches and multiple varieties. Rope dyeing and jig dyeing belong to this category. Pad dyeing is a dyeing method in which the fabric is first immersed in the dye solution, then the fabric is passed through a roller, the dye solution is evenly rolled into the fabric, and then the dyeing method is steamed or hot melted. It is suitable for dyeing large quantities of fabrics.
Color fastness (Color fastness) is also called color fastness, dye fastness. It refers to the resistance of the color of textiles to various effects during processing and use. The fastness grade is evaluated according to the discoloration of the sample and the staining of the undyed lining fabric. Textile color fastness test is a routine test item in the internal quality test of textiles.
Because the conditions of fabrics in the process of processing and use are very different and the requirements are different, most of the current test methods are simulated tests or comprehensive tests according to the working environment and conditions, so the test method of color fastness The content is quite extensive. However, looking at the International Standards Organization (ISO), the American Society of Dyeers and Chemists (AATCC), Japan (JIS), the United Kingdom (BS) and many other standards, the most commonly used are washing resistance, light resistance, friction resistance, perspiration resistance, and Ironing, weather resistance, etc. In actual work, the test items are mainly determined according to the end use of the product and the product standard. For example, the wool textile product standard stipulates that the color fastness to sunlight must be tested. Of course, the sweat fastness of knitted underwear must be tested. Textiles (such as parasols, light box cloth, and canopy materials) must of course be tested for color fastness to weather.
The color fastness is good or bad, directly related to the health and safety of the human body. During the wearing process, the product with poor color fastness will cause the pigment on the fabric to fall off and fade when it encounters rain or sweat. The dye molecules and heavy metal ions are all It may be absorbed by the human body through the skin and endanger the health of the human skin. On the other hand, it may also affect other clothing worn on the body to be stained, or stain other clothing when washed with other clothing.
Therefore, it is important to choose a suitable Wet rubbing fastness improver.