Quaternary ammonium salt type polycation color fixing agent can be prepared by reacting ethylene triamine with epichlorohydrin and alkylating with glycidyl trimethylammonium chloride. In addition, reactive color fixing agent and dimethyl diallyl ammonium chloride polymer can be prepared by the reaction of polyamine resin with epichlorohydrin. For example, the color fixing agent PDM is a new color fixing agent improved on the basis of the color fixing agent PDV. Its color fixing mechanism is to form a film on the surface of the fabric through high-temperature baking, so that the active group in the color fixing agent PDM reacts with the dye and the active group on the fabric, so as to strengthen the connection between the dye and the fabric; In addition, the soft chain segment in the color fixing agent PDM will make the fabric surface smooth and improve the friction color fastness of the fabric. Due to its softness and hydrophobicity, the hydrophobicity of the lake formed by the color fixing agent and the dye will be improved, so as to improve the color fastness to washing.
Sol-gel method (Sol-Gel) is a new material preparation method. The fixative made by this method is mainly used for fixation of reactive dyes, and the dyeing effect is better for white cloth. After sol-gel process, a thin film will form on the surface of the fabric, which will effectively improve the color fastness, pollute the environment and protect the environment. After sol-gel process, the fabric has improved the color fastness, and the fabric’s ability to resist ultraviolet, antistatic and bacteria has been raised.
Waterborne polyurethane (WPU) refers to the polyurethane dispersion system with water as the medium. It has the advantages of non combustion, non-toxic, pollution-free, energy saving and so on. The waterborne polyurethane color fixing agent was first prepared by the scientist schlack P through experiments to increase the dispersion of emulsifier. Later, Jacobs successfully made the waterborne polyurethane color fixing agent enter the experimental stage through experiments. Up to now, there have been more than 800 patents related to waterborne polyurethane color fixing agent. A series of experimental results show that waterborne polyurethane color fixing agent has many advantages, and the color fixing effect on direct, reactive and acid dyes is mainly in water washing It can strengthen the fastness to rubbing and soaping. At the same time, waterborne polyurethane color fixing agent also has the advantages of short production process, low energy consumption, small pollution range, strong waterproof and air permeability and so on.
Amino silicone oil is the main variety of modified silicone oil, which is mainly used in the later finishing of fiber, increasing brightness and so on. Can the amino group in the color fixing agent of modified waterborne polyurethane resin interact with the fibers on the fabric surface, reduce the friction coefficient between the fibers in the fabric and make the fabric feel soft. Nano color fixing agent has the positive charge of general color fixing agent, and can form a lake with water-soluble dyes. Moreover, polymer nano silicone can enrich and form a film on the fiber surface, and form a continuous network film on the fiber surface, so as to make the fabric surface smooth and reduce the friction coefficient of the fiber surface, so it can significantly improve the color fastness to dry and wet friction
