Common dyeing agents and their properties in printing and dyeing

1) Acid is dissolved in water and will have a light or heavy sour taste. Common acids include: sulfuric acid, glacial acetic acid, oxalic acid, etc.

2) Alkali has an astringent taste and a smooth feel. Common alkali include: caustic soda, soda ash, baking soda, disodium phosphate, sodium silicate, etc.

3) The relationship between pH value and acid-base strength

①PH value is divided into 1~14

Small PH value – strong acidity

High PH value – strong alkalinity

PH value=7—Neutral

②The relationship between pH value and acidity and alkalinity can be represented by the following soil:

③When acid meets alkali, it will neutralize and generate salt and water that are neither acid nor alkali

Such as 2NaOH+H2SO4=Na2SO4+H2O

(Caustic soda) (Yuanming powder)

1) Common oxidants: such as hydrogen peroxide and sodium hypochlorite

2) Common reducing agents: such as insurance powder and sodium sulfite

1) Penetrating agent: Reduce the surface tension of the solution so that the fiber can be easily wetted and penetrated

2) Detergent: plays a washing role, making it easy to remove dirt on fabrics, and is often used as a boiling and bleaching aid

3) Caustic soda (NaOH): a strong alkali, used as a scouring agent for cotton cloth and a stripping aid. After use, it should be neutralized with acid before cleaning

4) Soda ash (sodium carbonate Na2SiO3): used as water softener, T/C fabric scouring aid and reactive dye fixing agent

5) Baking soda (sodium bicarbonate NaHCO3): can be used as a reactive dye fixing agent

6) Trisodium phosphate: Na3PO4 acts as water softener

7) Sodium hexaphosphate: acts as water softener

8) Sodium silicate (Na2SO4): used as a cotton scouring aid and a stabilizer for hydrogen peroxide bleaching

9) Hydrogen peroxide (H2O2): Bleach, which can bleach fabrics and can also be used as a deoxidizer

10) Sodium sulfite (Na2S2O3): used as a scouring aid for cotton fabrics to prevent brittleness of cotton fabrics. It can also be used as a residual oxygen neutralizer and dechlorination agent

11)�Sodium chloride (Na2S): sulfur dye dyeing auxiliary, fully reducing and dissolving sulfurized fuel

12) Sodium hypochlorite (NaClO): used as a bleaching agent, and can also be used for color stripping and tank cleaning

13) Table salt (NaCl) or Yuanming powder (Na2SO4): used as a dyeing accelerator for direct reactive dyes sulfur dyes, which can increase the dye uptake percentage of the dye

14) Insurance powder (NaS2O4): a strong reducing agent, which plays the role of color stripping and reduction cleaning

15) Dispersant (or diffusing agent): used as a disperse fuel dyeing auxiliary to evenly disperse disperse dyes in the dye liquor to ensure the stability of the dye liquor

16) Glacial acetic acid (HAC): used as a dyeing auxiliary for disperse dyes to adjust the pH value, and as a neutralizing agent for alkali

17) Ammonium sulfate [(NH4)2SO4]: used as an anti-alkali agent for disperse dyes, and can also play a role in jumping the pH value

18) Leveling agent: It can make the dye evenly dyed and achieve the leveling effect

19) Oxalic acid: can wash away rust spots on fabrics

20) Fixing agent: (fixing agent Y or M) makes the direct dye firmly adhere to the fiber, thereby improving the dye fastness

21) Softener: Combined with fibers or adsorbed on the fiber surface, it acts as a wetting agent and improves the feel of the fabric

22) Pingping plus O: used as a direct, reactive dye leveling agent

23) Varnish: remove oil stains on fibers

24) Puffing agent: Puffs the fiber, which helps the material penetrate into the fiber.

25) Repair agent: makes the fiber absorb color evenly and is conducive to leveling dyeing

26) Whitening agent: Improve the whiteness of bleached cloth

27) Defoaming agent: Reduce or remove the foam of the solution

28) Baking soda: used as a deoxidizer to remove residual oxygen

29) Taikoo oil: used as a penetrating agent for sulfur dye dyeing. Strong penetrating power can make sulfur black, cloth horse black and soft to the touch

30) Urea: solubilizer and can also be used as an anti-brittle agent for sulfur dyes