Cotton-wool blended products have huge market prospects because of their unique style. Wool’s excellent elasticity and low thermal conductivity compensate for cotton’s dull feel, wrinkle resistance and high thermal conductivity. Compared with pure cotton or cotton and chemical fiber blended fabrics, cotton-wool blended and interwoven fabrics are warmer and more comfortable, and not only have good texture And appearance style, but also has a good price/performance ratio. Since the 1940s, the application practice of cotton and wool blended products has shown that cotton and wool blended products can integrate the characteristics of the two fibers, thereby giving the product a unique style. At the same time, this has brought new topics to product research and production.
Due to the different morphological structures and chemical properties of cotton fiber and wool fiber, their reaction properties to acid and alkali are opposite, which brings great difficulties to dyeing and finishing. Therefore, the dyeing and finishing of cotton and wool blended fabrics must take into account the chemical properties of the two fibers and maintain the characteristics of the cotton and wool blended fabrics to determine the process. In particular, the same color of cotton and wool is an important indicator in dyeing.
Since the same fuel has different selectivity or dyeability for different fibers, there are differences in the dye uptake rate, dyeing rate, color, etc. Therefore, to achieve good homochromism, appropriate dyes must be selected to make the The dye uptake rate on cotton wool meets certain requirements. Relevant data show that when the same dye dyes cotton wool blended products, the theory that the cotton wool will be dyed with the same color is the theory that the ratio of the dye uptake rate on the cotton wool is proportional to the ratio of the specific surface area of the cotton wool. The specific surface area of cotton is larger than that of wool. For example, the dyeing rates of cotton and wool are equal, and the dye concentration per unit area of cotton is smaller than that of sheep and horse fibers. This causes the apparent color amount of cotton to be lower than that of wool, resulting in color difference. . In order for cotton fiber to have the same apparent color, the dye concentration per unit area of cotton fiber and wool fiber must be equal. Use environmentally friendly biological enzymes to pre-treat cotton-wool blended products, and use multi-reactive group reactive dyes with good level dyeing properties, high dye uptake rates, good stability and good fastness to dye cotton-wool blended fabrics.
The ⊿K/S value of light-colored fabrics (a function of K/S surface depth, the larger the value, the darker the color) is smaller than the ⊿K/S of medium-colored fabrics and dark-colored fabrics, that is to say The darker the blended fabric, the less likely it is to achieve the same color, and the lighter the dyeing, the easier it will be to achieve the same color.
The dyeing process of cotton/wool blended yarn is mainly one-bath dyeing process. The reason is that one-bath dyeing has the following characteristics: (1) Reduce the dyeing cycle time, improve production efficiency, high output, and reduce labor costs. and general management expenses can be compressed as much as possible; (2) Save energy consumption; save the consumption of chemicals such as auxiliaries; (3) The dyeing uniformity is easy to control and adjust, and the dry and wet rubbing fastnesses of the dyed yarn are even better.
Typical cotton/wool blended fabric dyeing prescription is: dye (owf2% for fabric), sodium sulfate (40g/l), initial dyeing pH (8), alkali agent (sodium carbonate) (15g/l), Temperature (60℃), liquor ratio (20:1), dyeing time (90min).
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