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Test on composite color fastness to light and sweat of textiles
2024/12/26
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GB/T14576-1993 stipulates two test methods for determining the color fastness of textiles to light and sweat composite action. It is suitable for determining the light and sweat composite color fastness of pure and blended fabrics of cotton, linen, silk, and chemical fiber, but not for loose fibers. The xenon lamp aging test machine is a test instrument.
As a modern technology enterprise integrating R&D, manufacturing, sales, training, and services, Standard Sales Group (Hong Kong) Co., Ltd. is committed to delivering more testing instruments to the market, providing testing instruments for textiles, leather, combustion, automotive interior and exterior trims, material environmental climate aging, etc., and non-standard customization is also acceptable. Targeted tests can be carried out according to customer requirements before purchase to ensure that the purchased instruments are applicable.
Test principle:
Take three samples, one is a dry sample, and the other two are exposed to the light fastness tester together with the blue standard and dry sample after being treated with sweat. After reaching the endpoint, take out the sample, wash and dry it, and evaluate its composite color fastness to light and light sweat.
Reference standards:
GB 250 Gray sample card for evaluating color change
GB 730 Blue wool standard for color fastness to light and weather
GB 3922 Test method for color fastness of textiles to perspiration
GB 7565 Textile color fastness test Cotton and viscose standard adjacent fabric specifications
GB 8427 Textile color fastness test method Xenon arc
GB 8428 Textile color fastness test method Carbon arc
Test equipment:
Xenon arc lamp aging test machine: It should comply with the provisions of Article 4.1 of GB 8427.
Carbon arc lamp aging test machine: It should comply with the provisions 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 cover. The glass used in the container has a spectral transmittance of 0 for wavelengths of 275 to 320 nm and a spectral transmittance of more than 90% for wavelengths of 380 to 750 nm.
Test materials:
Covering: It should comply with the provisions of GB 8427 and GB 8428.
Gray sample card for evaluating discoloration: It should comply with the provisions of GB 250.
Blue wool standard: It should comply with the provisions of GB 730.
Cotton lining fabric: It should comply with the provisions of GB 7565.
Sweat preparation: Prepare acid and alkaline sweat according to the provisions of Chapter 6 of GB 3922.
Test specimens: Three specimens are required for each sample, one of which is 1cm×4.5cm in size for light resistance test. The other two are 10cm×4cm in size for light resistance sweat test.
Operation procedure:
Method A:
1. Pour the acid and alkaline sweat into two containers respectively, and put a combined sample consisting of a sample and a piece of cotton lining fabric (size not less than 12cm×8cm) in each container. The bath ratio is 50:1, and it is immersed for 30 minutes at room temperature to make it penetrate evenly. After taking the combined sample out of the sweat, it is squeezed on a small roller to make its liquid content 100±5%. During the test, the acid and alkaline sweat should be carried out separately.
2. Fix the combined sample on the sample holder along the warp direction and place it in the 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 the sweat, but the sample is not immersed in the sweat.
3. Place the light sweat test container containing the sample, the light-fastness sample, and the blue standard sample (levels 1 to 5) in the exposure chamber of the light-fastness tester, and expose them according to 4.1.4.1 of GB 8427 or 4.1.3 of GB 8428. When the color change of the level 4 blue standard sample reaches the gray card level 4-5, the exposure can be terminated.
4. Take out all the samples and blue standard samples, remove all coverings, place the light fastness sample in a dark place for 4 hours, and then evaluate its light fastness according to the provisions of Article 7.1 of GB 8427. Wash the light fastness sweat sample in 40℃ warm water for 5 minutes, dry it in the air not exceeding 60℃, and evaluate its light fastness sweat composite color fastness.
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. Two combined samples are made and placed in acid and alkali sweat respectively, with a bath ratio of 50:1. They are immersed for 30 minutes at room temperature to make them penetrate evenly. The combined sample is taken out and squeezed on a small roller to make its liquid content 100±5%. During the test, the acid and alkali sweat should be tested separately.
2. Same as A method 2, but do not use light and sweat test containers.
3. Same as A method 3.
4. Same as A method 4.
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