Selection of dyes for transfer printing

Foreign research on transfer printing originated in the 1960s. China began research in 1974 and applied transfer printing to production. It developed rapidly in the 1980s. At present, the market for transfer printing in China has begun to take shape. Dye is an important element of the transfer printing process. Its quality directly affects the printing effect and even the health of consumers. Therefore, how to choose a good dye is of great importance to a transfer printing company.

Through collecting information and interviews with leading corporate leaders, the editors tried to analyze the transfer printing dyes from multiple angles to provide reference for you to choose the right dye.

Dyes suitable for transfer printing and their conditions

Fast-dyeing disperse dyes: When the temperature is about 180°C, the hair color can be sublimated, the temperature can be increased, the color can change, and the edge can be osmotic. Good disperse dyes, the temperature in the range of 180 ~ 210 °C can fully sublimate and hair color. The hair color curve is flat. The effect of temperature on dyeing is not great. It is a suitable disperse dye for transfer printing.

Late-type disperse dyes: The dyes do not sublimate and develop color well at 180 to 210°C. If you increase the temperature, you can get good hair color. These dyes have a strong dependence on temperature when dyed.

Dyes suitable for transfer printing should have the following conditions:

(1) The dye for transfer printing must be able to fully sublime at 210°C, be fixed on the fiber, and obtain good washing and ironing fastness.

(2) The dyes used in transfer printing can be fully sublimated and converted into gas-phase dye macromolecules when heated, condense on the surface of the fabric, and can be transferred to the fiber. Internal proliferation.

(3) The dye used in transfer printing has a low affinity for transfer paper and has a high affinity for fabrics.

(4) Transfer printing dyes should have a bright, bright color.

Reactive dye choice is the key

1, the choice of dye is critical:

a. Reactivity: Moderate; b. Directness: medium to low. In addition, the fixing rate of the dye itself must be considered: if the fixing rate is too low, the amount of dye is large, which is not favorable for the post-washing. In general, the domestic M-type, foreign P-type, depending on the specific color to choose.

2, steaming requirements do not underestimate:

Under saturated steam, 102 degrees X 8 minutes is enough. According to the current customer's requirements for quality, it seems that using a baking method is not the best choice.

3, after washing process should pay attention to:

a, after the wash must at least ensure that the first three troughs cold wash, and strong flush, put the bottom empty; b, if a small number of wash trough, you can add a trellis method to extend the cold wash time to meet the paste has Sufficient puffing time to speed up the removal of excess dye; c, soaping, do pay attention to use non-alkaline additives, the best choice is chelating dispersant (such as Degussa SN-S).

In addition, it is also a very effective method to properly use some high-color compound pastes instead of seaweeds in order to reduce the amount of dye used to reduce the washing water burden.

Some transfer printing dyes may cause cancer!

The most basic material for transfer printing is dyes that can sublimate under heat. There are 139 dyes that G.Holland has sublimated at about 200°C, including 91 divergent dyes, 34 cationic dyes, 9 solvent dyes, 2 acid dyes, and 1 vat dye. Since fabric is different from paper, it generally requires repeated use after washing, so it must be subject to washing fastness is closely related to fastness.

In recent years, some dyes have been found to be carcinogenic, such as Disperse Yellow No. 23 in the “Oldest Sample”. According to the OKO-Texstandard 100 standard, Disperse Yellow 1, 3 and 9, Disperse Orange 3, Disperse Red 1, 11 and 17 and Disperse Blue, No. 1, 3 and 26 are banned allergenic dyes, these dyes are fat-soluble, Easy to be absorbed by human skin. Therefore, dyes used for transfer printing must be safe and harmless to the human body, and they should not solely consider technical and economic factors.

What is the difference between domestic dyes and foreign brands?

In response to this problem, the editor interviewed Li Liangyi, the deputy general manager of Shanghai Liqi Printing Fabrics Co., Ltd. Mr. Li introduced that there is still a big gap between domestic dyes and foreign ones. Despite the relatively low price of domestically produced dyes, but in terms of quality, both in terms of color and printing effect are far from each other, domestic dyes add some additives, even if the surface can not see, but the effect of printing out Far worse; and some domestic dyes contain aniline and other serious harmful substances in the body, and transfer printing products are mostly close to the human body with clothing, furniture and other items, the consequences of the use of inferior dye will be direct Causes damage to the consumer's body and the consequences are very serious. Domestic standards in this area are still not sound enough, so the domestic dye market can be described as a mixed bag. Except for some larger brands, the quality of other products is difficult to guarantee. Therefore, you must not use cheap dyes that are not acceptable.

Compared with domestic dyes, imported dyes must pass European standards and are rigorously tested. Although the price is higher, they are reliable in terms of printing effects and environmental protection.