Discussion on the technique of identifying cashmere and wool by dyeing

【Wool Net】Use Lannasu reactive dye to dye cashmere, wool and cashmere wool strip samples mixed in a certain proportion. According to dye uptake, absorbance and color difference, the orthogonal test method is used to optimize cashmere and wool. The process conditions with the largest difference in color degree were compared, and the two kinds of fibers were dyed according to different blending ratios, and the absorbance E value of the known blending ratio of the dyeing residue of the sample was measured by a spectrophotometer. According to the experimental data, the relationship between the blending ratio and the E value is established, and the blending ratio is calculated according to the E value, which becomes an auxiliary method for identifying the content of cashmere and wool. The result shows 1. Cashmere and wool have different dyeing properties due to their different fiber structure. Under the same conditions, wool is dyed faster than cashmere, dye dyeing is easy, and it is not easy to fall off, and the dyeing color is deeper than cashmere; There is a certain relationship between the difference between cashmere and wool blending ratio and the absorbance after dyeing.

Y=136.05X2 + 37.074X - 1.5512 (x is the absorbance after dilution. Y is the cashmere mass fraction).

Advances in the identification of animal fibers in fabrics using DNA analysis

In recent years, there has been an increase in demand for the production of high-grade textiles from animal natural fibers around the world (especially in Europe, Japan and North America). Due to the limited number. The price is expensive, and the doping phenomenon of the product sometimes occurs. Typically, fiber analysis is performed on a scanning electron microscope (SEM). but. This method is very time consuming. And expensive. The test results are highly dependent on the test procedures and the professionalism of the experts. to this end. Regardless of the processing conditions of yarns, fabrics, and apparel, you need

There are reliable ways to determine the composition and proportion of animal fiber contained in it. The use of DNA analysis to identify animal fibers used 10 different animal species from 12 animal farms in Germany. A key factor influencing the success of DNA analysis is the ability to isolate sufficient amounts of (polymer) DNA in the purest form. The quantity and quality of DNA isolated from different fibers. It depends directly on the purity of the fiber. The DNA method can be used to analyze the detection results that the SEM cannot do, and the detection time is shorter. The results show that fiber dyeing can damage the fiber DNA or impede DNA extraction, which is more serious than the bleaching process. but. At present, it is necessary to distinguish animal species of cashmere, mohair and other similar species and make quantitative analysis, and still rely on SEM method.

HBP-NH, salt-free dyeing properties of grafted oxidized linen fabric

To achieve salt-free dyeing of flax fiber reactive dyes. HBP-NH2 grafted oxidized flax fiber (HGLF) was prepared by selective oxidation of flax fiber with sodium periodate and grafting of HBP-NH2. The results of reactive dyeing showed that the HBP-NH2 grafted oxidized linen fabric increased the zeta potential of the surface of the linen fabric. The charge repulsion between the reactive reactive dye and the fiber is greatly reduced, which is favorable for the adsorption of the reactive dye on the linen fabric; compared with the conventional salt dyeing. The dyeing performance of HGLF is significantly improved, and the color fastness to washing and the leveling performance are satisfactory, but the rubbing fastness is lowered.