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Color fastness to perspiration is one of the most routine test items in textile testing and is also a test in GB 18401 Basic Safety Technical Specifications one of the elements. The existing standards for color fastness to perspiration mainly include IOS 3922-19951, ISO 105-E04:20082, AATCC 15-20103, JISL0848-20044, these standards exist on many unclear ones Places, especially in the IOS 3922-1995 standard, the solution immersion temperature, the number of splints, the liquid retention rate and the placement method of the perspiration color fastness tester are not clearly defined, which directly leads to the results of different laboratories testing this item. has a difference.
This article uses the automatic color fastness rating system to objectively analyze the color fastness of textiles to perspiration The influence of factors such as immersion temperature and liquid carrying rate in the test on the test results. By exploring some unspecified influencing factors of perspiration fastness according to different factor levels, the degree of influence is clarified to effectively control the test data and improve each laboratory's consistency in perspiration fastness testing.
1 test part
1.1 test example
Maroon cotton-polyester fabric, black wool-woolfabric, royal blue polyester brocade fabric, navy blue polyester viscose weave, black wool.
1.2 Experimental Drugs
Sodium Chloride, L-Histidine Hydrochloride, Sodium Dihydrogen Phosphate Dihydrate, Disodium Hydrogen Phosphate Dodecahydrate, Sodium Hydroxide.
1.3 Test Instrument
DIGIEYE Automatic Color Fastness Rating System manufactured by ATLAS SDL Company of the United States; M231 Color Fastness Tester to Perspiration manufactured by ATLAS SDL Company of the United States; PL203 Electronic Scale Swiss made by Teller Company; YB902 Perspiration Color Fastness Furnace manufactured by Darong Textile Instrumen Co.,Ltd.
1.4 Test principle
Put the combined sample into two different test solutions, after processing, remove the test solution separately, put it in the oven with the weld color fastness meter, and place the combined sample Sample After drying, use the gray sample card as Reference to determine the soiling of each adjacent fabric with an automatic color fastness rating system.
2 results and discussion
2.1 Soak Solution Temperature
IOS 3922, ISO 105-E04, AATCC 15 and JIS L0848 do not have clear regulations on the immersion temperature of combined samples in sweat. The standard only states that the test should be carried out at room temperature. Table 1 shows the change in immersion temperature, test results of different fabrics at different soaking solution temperatures.
Table 1 and Figure 1 show that that the discoloration of the lining material with increasing perspiration ung shows some change Temperature The degree is about half. Especially the impact on woolen fabrics is more obvious, because the solubility of dyes generally increases with increasing temperature, the force between dye molecules is weakened and easy to dissolve, so the dyes remaining in the combined sample are less, and the lining stains are not obvious. From the point of view of standardizing the test consistency of different laboratories, it is recommended that when revising the standard, select an appropriate temperature and increase the test conditions of a constant temperature water bath in order to reduce the influence of changes in immersion temperature on the test results.
2.2 Sample Fluid Transport Rate
IOS 3922, ISO 105-E04, AATCC 15, JIS L0848 The color fastness of paired samples, those drenched in sweat and pinched in sweat are not a uniform regulation of fluid carrying capacity before the gauge, see Table 2.
For this situation, this work examines the influence of different sample liquid transport rates on the test results, see Table 3 and Figure 2.
From Table 3 and Figure 2 it can be seen that as the liquid retention rate increases, lining staining gets worse, from 95% to 150% for thin fabrics and 200% for thick fabrics LiquidIn the case of thin non-absorbent fabrics, the change in liquid carrying capacity has little effect on the test results, the change in speed makes the test results vary widely, but it gradually tends to become stable .Because the dye solution remains in the capillary gap of the fabric tissue, the dye solution remaining in the fabric gap and flowing easily under the action of gravity moves to the fabric surface by the capillary effect, resulting in a floating phenomenon. The greater the liquid transport rate of the fabric, the easier the dye migrates. Therefore, when revising the standard, it is ly recommended to choose an appropriate liquid transport rate for the sample Reducing the impact of liquid transport rate changes on the test results
2.3 Oven Temperature
Appendix IOS 3922 prescribes a rapid test method for perspiration, i.e. drying at 70°C for 1 hour Various commonly used textiles are used in this paper to test the The results of the rapid method (70°C, 1 hour) agree with the results of the conventional method (37°C, 4 hours). As can be seen from Table 4, the quick method has a greater impact on the stains on the wool lining fabric and other fabrics are relatively close
3 Conclusion
The test shows that the test results of thin fabrics such as cotton-polyester fabric, polyester-nylon fabric and polyester-viscose fabric are relatively stable, while wool fabric These Factors of the fabric must be uniformly specified in the standard to achieve the comparative effect, if the liquid retention rate and the immersion temperature are neglected in the daily testing process, there will be an impact on the test results, especially the influence of the liquid retention rate on the test results even level 1. Therefore, will recommended to pay attention to the following two points when revising the standard:
1) Enter appropriate sample liquid transport rate to assess the impact of changes in liquid transport rate on test results;
2) Specify an appropriate temperature and increase the test conditions in a constant temperature water bath, reducing the impact of changes in immersion temperature on the test results.
