Color fastness tester to test the color fastness to light and sweat of pure cotton fabrics

The color fastness to light and perspiration of pure cotton fabrics is greatly affected by the variety of dyes. The light-colored fabrics generally have lower light and perspiration fastness than dark fabrics. When the surface is neutral, the light and sweat fastness of the fabric is good; the light and sweat fastness of the color-blocking fabric is determined by the dye with the poor light and sweat fastness. The color fastness testing-equipment' target='_blank'>tester to sunlight is suitable for testing the color fastness to light and perspiration of pure cotton fabrics. It can be used to evaluate the influencing factors of the color fastness to light and perspiration of fabrics. customer inquiries. Test standard: The composite color fastness of fabrics to light and sweat adopts GB/T 14576—2009 'Textile color fastness test - light fastness, perspiration composite color fastness' test; the pH value of the fabric adopts GB/T 7573—2009 'Determination of pH value of textile water extract' test. Test results: 1. The effect of dye concentration on the light fastness and light perspiration color fastness of fabrics Six kinds of reactive dyes of different colors were selected and dyed by the two-bath pad dyeing method. The dyed fabrics were tested and rated according to the national standard, and the The results are shown in Table 1. It can be analyzed from Table 1 that with the increase of dyeing concentration of reactive dyes of different colors, the color fastness to light and sweat of the obtained fabrics will increase to a certain extent. As can be seen from Table 1, the test results of two varieties of yellow reactive dyes, golden yellow R-4RFN and golden yellow RES, with different concentrations show that their light and sweat resistance can reach grade 4 or above, and they have good light and sweat resistance. The two varieties of reactive red, with the decrease of dyeing concentration, their light fastness decreased to a certain extent, especially when the dyeing concentration decreased to 0.3g/L, the acid and alkali sweat resistance decreased obviously. The test results of blue reactive dyes show that the light fastness and light perspiration fastness of turquoise blue G cannot meet the requirements of daily use. Complaints are more consistent. In addition, reactive dyes have a certain sensitivity to the components of sweat, and the effect of alkaline sweat is greater than that of acid sweat. It can also be seen from Table 1 that the color fastness to light and perspiration of reactive dyes is not only related to the concentration of dyeing, but also to the type of natural color of the dye. 2. The effect of pH value on the color fastness to light and perspiration of the fabric The acidity and alkalinity of the fabric surface have a great influence on the performance of the fabric. Since pure cotton fabrics generally need to go through mercerizing and washing procedures during the post-finishing process, the pH of the cloth surface varies greatly. The pH value of the fabric affects its light and sweat resistance to a certain extent. In this test, the pH value of the fabric surface was adjusted by padding sodium carbonate solution and acetic acid solution, and the effect of pH value on the light and sweat fastness of the fabric was tested. The test results are shown in Table 2. By changing the pH of the fabric surface and re-testing the color fastness to light and perspiration of the fabric according to the national standard method, it is found that the pH has a certain degree of influence on the light and perspiration test of the fabric. When the fabric surface is neutral again, its light and perspiration resistance is good. When the pH of the fabric surface is adjusted, its light and perspiration color fastness decreases to a certain extent. When the fabric surface was adjusted to acid, its color fastness to acid and perspiration decreased significantly; and when the fabric surface was adjusted to alkaline, its color fastness to alkali and perspiration decreased significantly. The reason for this pattern may be that the acid-base substances on the fabric surface enhanced or weakened the effect of acid-base on the fabric during the test process, which resulted in the change of the fabric's light and sweat resistance. 3. The effect of color matching on the light and sweat fastness of fabrics In the actual dyeing process, it is usually necessary to mix several basic colors to match the desired color. However, due to the ratio of golden yellow R-4RFN and red R-2BF, as well as the ratio of golden yellow RES and scarlet RES, different dyes have better resistance to light and perspiration, and the color fastness to light and perspiration of the fabric is better; When the dyes are added with blue C-R and turquoise blue G, which have poor color fastness to light and perspiration, the color fastness to light and perspiration of the fabric shows obvious discoloration and fading. Therefore, multiple colors are dyed after color matching, even if the light and perspiration fastness of multiple dyes is good, the light and perspiration fastness of the fabric is determined by the dyes with poor performance. Test conclusions: (1) The color fastness to light and perspiration of reactive dyes is not only related to the concentration of dyeing, but also to the type of dye's natural color. (2) When the fabric surface is neutral, its resistance to light and sweat is good. With the adjustment of the pH of the fabric surface, the color fastness to light and sweat shows a certain degree of decline. (3) After dyeing a variety of colors after color matching, the light and sweat fastness of the fabric is different, and there will be differences in the actual application process, which has a certain degree of influence on the light and sweat fastness of the fabric. The color fastness to light and perspiration of the tested fabrics is shown in Table 3 by dyeing after blending several dyes. From the test results in Table 3, it can be seen that there are great differences in the light and sweat resistance test results of dyed fabrics under different ratios of several reactive dyes. Degrees are determined by poorly performing dyes.

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