Printing Paste for Sodium Carboxymethylcellulose

Sodium Carboxymethyl Cellulose (CMC) is a high molecular compound obtained from cellulose through chemical modification. In textile printing and dyeing, CMC serves as a replacement for sodium alginate with active dye printing. Its color brightness, color fastness, and feel are equivalent to those of sodium alginate. CMC has a high paste rate, and the film formed after drying is tough and easy to wash off compared to starch paste. Similar to sodium carboxymethyl starch paste, due to the presence of many carboxylate anions in its molecules, it is suitable for anionic dyes. CMC paste generally withstands calcium and magnesium ions in hard water. High-substitution and low-viscosity paste have strong electrolyte and acid resistance capabilities, making CMC widely used in textile printing and dyeing processes.

Sodium Carboxymethyl Cellulose (CMC) is used as a printing paste mainly serving as a thickener and suspending agent. Printing-grade CMC is less reactive with active dyes; it has good paste formation and stable storage. With a high structural viscosity and good water retention, it is suitable for rotary screen, flat screen, and manual printing. Printing-grade CMC has very few gel particles, high transparency, excellent permeability, and filtration performance. It enhances the hydrophilicity and permeability of dyes, thereby improving the clarity and color fastness of printing. Its rheological properties make it more suitable for fine pattern printing on hydrophilic textile fibers compared to sodium alginate. The actual printing effect can rival the latter, achieving good economic benefits when used alone or in combination with sodium alginate in printing paste.

Advantages of printing-grade sodium carboxymethyl cellulose:

1. Ultra-high degree of substitution, uniform distribution of substitution groups, very few gel particles, ensuring no defects in printing and dyeing.
2. Stable viscosity, good resistance to salt and alkali.
3. Good permeability of the solution, excellent flowability.
4. Good dyeing properties.
5. High efficiency in water washing after printing, good fabric feel, comparable softness to sodium alginate.
6. Good water retention, suitable for printing fine patterns.
7. It is non-reducing itself and does not react with active dyes.