What is the principle of acrylic fiber dyeing Ⅰ

This article explains the principle of acrylic fiber dyeing. The description and application of important parameters in the process of dyeing, focusing on the accumulation of practical results, and providing valuable wealth for promoting acrylic fiber dyeing technology.

Acrylic fiber dyeing mechanism

Polypropylene fibrous fiber macromolecules are acidic, and cation dyes can be regarded as a ion exchange process. Dyes ion D+and fiber FSO3H or FCOOH occur in an ion exchange response. The following formula can be used: FSO, —H ++ D+= FS0 one D ++ H+or FC0O — H ++ D+= FCOO-D4-+H+acrylic fibers Due to the existence of acid groups and the strong electrical negativeness of cyanomy, under the condition of dyeing bath, the fiber surface has negative charge, and the value of the potential of a high potential layer is approximately (44-158mv).

The analysis of the upper dyeing process is combined with the salt bond due to the salt bond due to the cedic dye with the acid F cation in the fiber. Due to the different production processes of the fiber, the number of acid groups in the fiber is also different. The dyeing of dyes that are not combined with the acidic group in the fiber is poor. Therefore, the chromatal saturation value of cationin dyes should not exceed the chromatal saturated value of fiber binding fiber binding.

Compatibility (compatibility)

Different cations dye mixes together for dyeing, and may have a different upper dye rate (bidding dye) with them alone, so the compatibility of dyes is an important performance. Compatibility means that the upper dyeing rate is equal when the dyeing of two or more dyes is equal, and as the dyeing time is prolonged, the color (tone) always maintains unchanged performance (only the dense changes).

1. The compatibility value is small, the affinity is high, the upper dye rate is fast, the uniform dyeing properties are poor, and the color is high -dyeing thick or medium thick color; (color combination: the difference between the compatibility value is not greater than 0.5).

2. The cationic dyeing acrylic is mainly positioned and adsorption. Its adsorbing elevation line belongs to the Langeguel type, and there is a saturation value.

3. Dye saturation value: When the dyeing reaches a balance, the maximum dye weight of the dyeing fiber can be up to the percentage.

Adsorbing the same thermal line and chromatal saturation value

The saturation value of the dye: refers to the dyeing value of the dyed dye on the product under the prescribed conditions under the prescribed conditions. The saturation value of the dye is a constant for a yang ion dyeing system.

The saturation coefficient of dye (relative saturation value): The full value of the fiber is divided by the consolidation value of the dye, the business obtained. It refers to the relative relationship of different dyes on the value of standard dyes on the same fiber.

The saturation coefficient is a constant for a yang ion dye. Determining the ability of the acrylic dyeing acrylic in dyes: F is small, high in amounts of dyeing, thick color; Important parameters; acrylics with low saturation value are difficult to dye dark; during dyeing, the amount of dyes cannot exceed the saturation value of the dye on the fiber: when color fight, the sum of the dyes used should not exceed the full value of the fiber. Essence