Test method for composite color fastness of textiles to light and perspiration

Test method for composite color fastness of textiles to light and perspiration

GB/T14576-1993 specifies two test methods for determining the color fastness to light and perspiration of textiles, which are suitable for determining the combined color fastness to light and perspiration of pure and blended fabrics of cotton, hemp, silk and chemical fibers. Not applicable in loose fibers. 

Test principle: Take three samples, one is a dry sample, and the other two are treated with sweat and placed in a light fastness tester together with the blue standard sample and the dry sample. After reaching the end point, take out the sample, wash and dry it, and evaluate its composite color fastness to light and light and sweat. 

Reference standards: GB 250 Gray sample card for assessing discoloration GB 730 Color fastness to light and weather Blue wool standard GB 3922 Textile color fastness to perspiration Test method GB 7565 Textile color fastness test Cotton and viscose fiber standard lining fabric specifications GB 8427 Test method for color fastness to light of textiles Carbon arc lamp aging tester: It should meet the requirements of Article 4.1 of GB 8428. Light sweat test container: It consists of a test tube-shaped glass container and a sample holder with a lid, as shown in the figure. The glass used for the container has a spectral transmittance of 0 with a wavelength of 275-320 nm, and a spectral transmittance of 90% or more with a wavelength of 380-750 nm. 

Light perspiration test container Test material: Cover: should comply with the provisions of GB 8427 and GB 8428. Gray sample card for assessing discoloration: It should meet the requirements of GB 250. Blue wool standard: should comply with the provisions of GB 730. Cotton lining fabric: It should meet the requirements of GB 7565. Sweat preparation: Prepare acid and alkaline sweat according to the provisions of Chapter 6 of GB 3922. 

Test sample: Three samples should be prepared for each sample, one of which is 1cm in size×4.5cm for light fastness test. The other two pieces are l0cm in size×4cm, for light and sweat resistance test. Operation procedure: 

Method A: 

1. Pour the acid and alkaline sweat into two containers, respectively, and put a piece of sample and a piece of cotton lining fabric (not less than 12cm in size) into each container.×8cm) composed of combined samples. The bath ratio is 50:l, and it is soaked at room temperature for 30 minutes to make it penetrate evenly. Take the combined sample out of the sweat and squeeze it on a small roller to make the liquid content 100±5%. During the test, acid and alkali sweat should be carried out separately. 

2. Fix the combined sample on the sample holder along the meridian direction, and place it in a light and sweat test container containing 10mL of acidic sweat or alkaline sweat. At this time, it should be ensured that the lower end of the cotton lining is immersed in sweat, but the sample is not immersed in sweat. 

3. Put the light-perspiration test container with the samples in the exposure chamber of the light-fastness tester together with the light-fastness sample and the blue standard sample (grade 1-5). Expose. When the discoloration of the grade 4 blue standard reaches gray card 4—At level 5, exposure can be terminated. 

4. Take out all the samples and blue standard samples, remove all coverings, put the lightfast samples in the dark for 4 hours, and evaluate their light fastness according to the provisions of Article 7.1 of GB8427. The light and perspiration samples were washed in warm water at 40°C for 5 minutes, and then dried in the air at a temperature not exceeding 60°C, and then the composite color fastness to light and perspiration was evaluated. 

Method B: 

1. Pour the acid and alkaline sweat into two containers respectively. Take two samples, and put 6 layers of cotton lining under each sample. The size of the lining should be the same as that of the sample, and two combined samples were made, which were placed in acid and alkali sweat, respectively, with a liquor ratio of 50:1, and soaked for 30 minutes at room temperature to make it penetrate evenly. Squeeze on the small roll to make the liquid content 100±5%. During the test, acid and alkali sweat should be carried out separately. 

2. Same as method A2, but do not use light and sweat test containers. 

3. Same as method A3. 4. Same as method A4.

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