Cotton fabric, also known as cotton cloth, is a fabric woven from cotton yarn. Cotton fabric has become one of the commonly used fabrics due to its excellent wearing properties and is widely used in clothing fabrics, decorative fabrics and industrial fabrics.
The color fastness of cotton fabrics to sunlight is a very important indicator and has attracted more and more attention at home and abroad. Reactive dyes are commonly used for dyeing cotton fabrics. They have complete color spectrum, low price, convenient production control and good wet fastness. However, the color fastness of cotton fabrics dyed with reactive dyes to sunlight is relatively poor, especially light-colored fabrics that are difficult to meet the use requirements. Sunlight fading of dyes is a very complex process. In addition to factors such as dyes and fibers, external conditions such as the spectral composition of the light source, atmospheric composition and temperature around the fabric will affect the fading rate of textiles. In addition, the moisture content and dyeing depth of textiles will affect the fading rate of textiles. , fiber microstructure and post-processing such as soaping will affect the color fastness to sunlight.
Impact Analysis
The sun climatic color fastness meter uses a simulated natural environment to test the degree of fading of textiles under sunlight, and determines the color fastness of fabrics to sunlight, thereby measuring dye concentration, moisture content, pH value and sun fastness accelerator. A comparative analysis was conducted on the impact of fabric color fastness to sunlight and the following relevant analysis was obtained.
01. Effect of dye concentration on color fastness to sunlight:
The color fastness of cotton fabrics to sunlight is related to the type of dye. The lower the dye concentration, the worse the color fastness.
02. The influence of fabric pH value on color fastness to sunlight:
The pH value has a great influence on the color fastness of cotton fabrics to sunlight. The color fastness of fabrics to sunlight is good near neutral, while the color fastness of cotton fabrics to sunlight that is acidic or alkaline is not good.
03. The effect of fabric moisture content on color fastness to sunlight:
Moisture content has a greater impact on the color fastness of cotton fabrics to sunlight. The greater the moisture content, the worse the color fastness. This is mainly because the greater the moisture content of cotton fabrics, the greater the area where the dye particles accumulated on the surface of the fabric interact with water, and the color fastness to sunlight will decrease.
04. The impact of color fastness accelerators on color fastness to sunlight:
Sunlight fastness accelerators are effective in improving the sun color fastness of cotton fabrics and must be used together with other finishing procedures. Therefore, attention should be paid to the synergy of sun light fastness accelerators and other reagents when finishing cotton fabrics together. and reduction effects.
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