What is the function of wet rubbing fastness improver?

The wet rubbing fastness enhancer can link the dye and the fiber to form a compound. When reacting with the dye, it can react and cross-link with the cellulose fiber, so that the dye and the fiber can be closely and firmly connected to strengthen the dye. The combination with the fiber prevents the dye from falling off the fiber or migrating to the surface of the fiber, avoiding the decrease of the color fastness, thereby improving the wet rubbing fastness.

The floating color on the fiber is extremely detrimental to the color fastness to wet rubbing. For fabrics dyed with deep and dense reactive dyes, it is better to soap twice, but too many times of soaping will damage the dyed dyes, resulting in bond breakage. The effect is reduced. The use of wet rubbing fastness enhancer after soaping can effectively solve this problem.

This passage is going to talk about the following questions of the wet rubbing fastness improver:

(1) Why to use the wet rubbing fastness improver?

(2) Why test the color fastness?

(3) What is the color fastness?

 

(1) Why to use the wet rubbing fastness improver?

The function of wet rubbing fastness improver is to improve the color fastness. In a wide range of fiber finishing technologies, the most difficult problem to solve is dry and wet rubbing fastness. The so-called color fastness (referred to as color fastness) means that the dyed fabric is subjected to external factors (extruding, friction, washing, rain, exposure, light, seawater immersion, saliva immersion, water stains, sweat stains) during use or processing Etc.) The degree of fade under the action is an important indicator of the fabric.

Color fastness refers to the washing resistance and rubbing resistance of the product.

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.

 

(2) Why test the color fastness?

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.

 

(3) What is the color fastness?

The nature or degree of the variation of the dyeing state can be expressed by the color fastness. The dye fastness of the fabric is related to the type of fiber, yarn structure, fabric structure, printing and dyeing method, dye type and external force. The color fastness test generally includes light fastness, weather fastness, washing fastness, rubbing fastness, perspiration fastness, etc. Sometimes there are some according to different textiles or different use environments. Color fastness for special requirements. Usually, when the color fastness test is carried out, it is the degree of discoloration of the dyed material and the degree of staining to the lining. The color fastness is rated, except for the light fastness of eight, the rest are all five. The higher the grade, the better the color fastness.