Non-formaldehyde fixing agents are chemical substances used in textile processing to bind dyes or pigments to the fibers of the fabric, without the use of formaldehyde. Formaldehyde is a chemical that is commonly used as a fixing agent in the textile industry but is known to be hazardous to human health and the environment. Therefore, non-formaldehyde fixing agents are preferred as a safer alternative.

The functions of non-formaldehyde fixing agents include:

1. Improving colorfastness: Non-formaldehyde fixing agents can improve the colorfastness of the dye or pigment, making it more resistant to fading or bleeding during washing, exposure to light or heat, and other environmental factors.
2. Enhancing washfastness: Non-formaldehyde fixing agents help to bind the dye or pigment to the fabric fibers, preventing it from washing out during laundering.
3. Increasing rub fastness: Non-formaldehyde fixing agents can also improve the rub fastness of the dye or pigment, preventing it from rubbing off easily when the fabric is subjected to friction.
4. Enhancing adhesion: Non-formaldehyde fixing agents help to improve the adhesion of the dye or pigment to the fabric fibers, resulting in a higher quality and more durable print.
5. Reducing environmental impact: Non-formaldehyde fixing agents are safer and more environmentally friendly than formaldehyde-based alternatives, as they do not release harmful gases or pollutants into the air or water.

Overall, the use of non-formaldehyde fixing agents is important for achieving high-quality, long-lasting coloration of textile products, while also promoting safety and sustainability in the textile industry.