Dioctyl Dimethyl Ammonium Bromide is light yellow liquid with perfume odor. DDAB can easily be soluble in water with good chemical stability and good resistance to heat and light.Silk with the traditional acid dyes, direct dyes, although the dyeing rate is higher, yet the color fastness is low. Reactive dyes to dye the silk color fastness is very high, but will produce a large number of high chroma and high salt concentration.Therefore, it is of great significance to study new type of accelerating agent and accelerating principle.

Dyeing with acid dyes, direct dyes silk, although the higher rate of dyeing, but the color fastness to washing. Reactive dyes dyeing silk can get good soap washing fastness, but the dyeing rate and fixation rate is lower, which will produce a large number of high chroma, high salt concentration of waste water. Therefore, the research on improving the color fastness and color fastness of silk is reported.
In the method of staining with supercritical carbon dioxide dyeing method, micro suspension dyeing method ,in the graft modification of silk dyeing of the Silk Grafted Chitosan and quaternary ammonium treatment, in change of dyes in in reactive dye into hydrophobic chain and different forms of amino polymer chains . The Guang Xian Zhang quaternized grafted cationic silk can make reactive dyes to dye silk color fixing rate more than 99% of, but it is difficult to realize leveling; Tang Bing Tao in the reactive dyes into different forms of amino chain polymerization, silk dyeing and color fixing rate reached 99% and color fastness in level 4 or above, but this method need to modify all the dyes, larger workload. Studies have shown that small molecular cations of reactive dyes on silk staining with good dyeing effect, Dioctyl Dimethyl Ammonium Bromide(DDAB) on silk also has good dyeing effect