Diffusibility testing: Accurately collect 1g of dye, add 100ml of water at 30 ° C, stir with glass rods, drop the suspension of dye with 4-5 drops on the filter paper with a straw to observe its natural seepage ring, good diffuserity and good diffuser. The larger its area.
Some dye solutions are dripped at 1 ~ 2 layers of fuzzy osmotic rings, and the area is not large. The water solution outside the dye liquid osmotic ring is that it is best to add 20 % to 30 % of the diffusion agent MF when the dye is mixed. , Or add 2g/L decentralized dye repair agent to improve the diffusion of dyes and improve the dye dyeing. Very warm staining should not be used for diffusion N because it is not resistant to high temperature.
Disclosed testing: Put the remaining dye solution above and heat it on the constant temperature electric furnace to 70 ° C ~ 72 ° C, leave the heat source, stir with glass rods, and observe whether the dyes on the cup wall and glass rod are sticky.
If the fluidity of the dye solution is very good, the glassware is almost not dirty, indicating that the dye is divergent, and it can be stained at 100 ° C or high -temperature and high pressure.
High temperature decentralization stability test: The above dye solution is still poured into the glass dye cup, placed in the dyeing machine, and processed at 130 ° C and 0.18MPa for 30 minutes. Filtering paper can generally be placed on a 50ml cup). The shorter the filter time, the better. If the dye solution is observed after heating, it becomes thickest, and the touch of the touch with your fingers has a paste, indicating that the high temperature of the dye is poorly dispersed.
When used, the dye should also take measures to supplement 20 % to 30 % of the diffusion MF MF. If the water quality used in production is too high, the dispersed dye will produce secondary condensation in the dye bath. To prevent this situation, first of all, the pH value of the dyeing bath should be stabilized with ammonium sulfur sulfurization; secondly, 1 ~ 2g / L dispersed agent can be added to improve.
Do not add sodium phosphate as a soft water, because sodium sodium phosphate will lose the ability of lords and magnesium ions under high temperature and high pressure conditions, and to a certain extent, it can also increase the pH value of the dye bath, destroy the dye bath, and destroy the dye bath. Stability. There is a phenomenon such as increased fiber surface floating colors and decreased coloring. In severe cases, dark discoloration will occur.
In actual production, once the above phenomenon appears, it can improve the clarity of color by restoration and cleaning, or add a decentralized chelating agent to the restore bath.
Coking oil content test: Most of the diffusers produced now are coarse metatarium. Among them, the impurities are high, not only caramel, but also other compounds. Generally, after the above -mentioned heating and unheated dye solution is poured on the filter paper to dry, if the filter paper is small and irregular black spots, it can be regarded as impurities such as caramel.
If the impurities are small, you only need to add some uniform dyeing agents with good dispersing emulsification ability to the prescription. If there are many caramel content, the surface of the dye solution will also appear like oil -like golden layer.
You can add a 2g / L dispersant WA when dyeing, and add a small amount of foaming agent before the dye is added. Practice has proved that this "one -liquid multi -purpose" identification method is very suitable for printing and dyeing enterprises, and is convenient to operate.
Heat migration detection: After dyeing dyeing, polyester products are dyed. When heat treatment such as thermal treatment and ironing, the dyes inside the fiber are migrated to other fibers to other fibers. It is different from the sublimation fastness, but it can use the detection method of sublimation / ironing fastness for simulation test.
That is, a dyed polyester, with a piece of nylon and vinegar fiber fabric on each side. After 30 seconds of hot pressure at 180 ° C, it will be regarded as the degree of quality of the heat migration performance on the color of the fabric. Generally, the gray card is more than level 3 or above, and the contrary is worse. For dyes with high heat migration or woven products with high degree of color and weaving products.