Color fastness (referred to as color fastness) refers to the degree of fading of dyed fabrics under the action of external factors (extrusion, friction, washing, rain, exposure, etc.) during use or processing. It is a fabric test. Important indicators. Color fastness includes a wide range of contents, including washing resistance, saliva resistance, light resistance, friction resistance, sweat resistance, water resistance, chlorinated water resistance and composite color fastness. The author of "Comparison and Analysis of Testing Methods for Color Fastness of Textiles" analyzed the research status and shortcomings of different color fastness items, and listed the current standards for different color fastness items.
Color fastness to washing
Color fastness to washing is an assessment of the color retention , and is an important indicator to measure the use value of textiles. The current standards for color fastness to washing of textiles in CHINA mainly include GB/T 3921-2008 "Textile Color Fastness Test Color Fastness to Soaping" and GB/T 12490-2007 "Textile Color Fastness to Home and Commercial Washing Color Fastness" Degree", the two differ in scope of application, rating tools and selection of detergents.
Color fastness to light
At present, the current domestic testing standards for color fastness to light include [8] GB/T 8426-1998 "Textile Color Fastness Tests Color Fastness to Light", GB/T 8427-1998 "Textile Color Fastness Tests Color Fastness to Artificial Light : Xenon Arc", GB/T 8429-1998 "Tests for Color Fastness of Textiles and Color Fastness : Outdoor Exposure", among which GB/T 8427-1998 is a commonly used standard, and five methods are given.
Color fastness to rubbing
The color fastness to rubbing is divided into two types: dry rubbing and wet rubbing color fastness. Common standards for color fastness to rubbing include GB/T 3920-2008, AATCC 8-2007 , and JIS L 0849:2004. There are differences .
Color fastness to chlorinated water
Resistance to chlorinated water mainly refers to resistance to disinfection water and swimming pool water. Most domestic standards have specified the color fastness test method for textiles to be resistant to available chlorine in swimming pool water, and for textiles to be resistant to available chlorine in tap water (that is, low concentration) There are few color fastness testing methods.
Composite color fastness
Composite color fastness includes light /sweat color fastness, light/chlorinated water color fastness and sweat/light/chlorine color fastness, etc.
Color fastness to light/perspiration
Light/perspiration composite color fastness is referred to as light perspiration color fastness, which refers to the ability of the color of textiles to maintain the original color under the combined action of human sweat and sunlight during consumption . The countries that studied color fastness to light and perspiration earlier were Japan and Spain [18]. The existing domestic and foreign standards for color fastness to light and sweat include GB/T 14576-93, SN/T 1461-2004, JIS LO888-1988, ATTS, MIZUNO and AATCC 125-2004. There are obvious differences between these test methods , For different standards of sweat, there are also differences in the color fastness .
Color fastness to light/chlorinated water
For the test of light fastness/color fastness to chlorinated water, professional chlorine water treatment and then exposure, but there is no corresponding test method and relevant standards at home and abroad.
Perspiration/Light/Chlorine Fastness
Perspiration/light/chlorine color fastness So far, there is no test method standard for light, sweat and chlorine composite color fastness at home and abroad.
in conclusion
Through the comparison and analysis of the above different color fastness project standards and foreign standards, it can be seen that the color fastness test standards in my country still have the following deficiencies:
(1) Domestic testing standards for individual color fastness have been relatively perfect. Although there is some research on some composite color fastness testing standards, there is no uniform standard. Such as light/chlorinated water color fastness and perspiration/light/chlorine color fastness, in-depth research is needed in this area to establish a unified standard as soon as possible.
(2) When some standards are revised, the indicators of product standards and method standards are not carried out simultaneously, because changes in test conditions affect the final test results, resulting in a disconnect between method standards and product standards.
(3) The quantification of standard test conditions is lacking. This will affect the reproducibility and accuracy of test results. For example, there is no clear regulation on the test conditions of color fastness to light in our country.
(4) When product standards refer to test methods, there are multiple test conditions and methods listed. The product standards do not specify specific conditions. Different enterprises and testing institutions have different test conditions, resulting in different test results.
