For PA6 and polyurethane type of dyes and dyeing processes
Be used for the PA6 and polyurethane are several types of dye staining, including acid dyes, neutral dyes, disperse dyes, reactive dyes, etc.. PA6 and polyurethane on separate dyeing, the dye may be a single good results, but contains two components of the island in terms of microfiber synthetic leather, the situation is much more complex, especially when dyeing dark, even need to consider two or three kinds of dyes were blended dyeing.
Disperse dyeing
Disperse is a strong pre-and water-soluble hydrophobic small non-ionic dyes, the structure does not contain a lot of water-soluble polar groups, but larger groups, such as-NO2,-NH2,-CN,-OG etc. . Disperse dyes for dyeing rate of different species there than at the differences, try to use mixed colors on the uptake rate should be similar or better compatibility of dyes, such as disperse dye, or with weak with a blend of neutral dye staining to adjust the degree of shade and enhance the dyeing to achieve the purpose of each other.
Disperse dyeing rate more dependent on temperature, so dyeing with particular attention to temperature control. Temperature will reduce the absorptive dye dispersant, dye particles collide opportunity to increase cohesion. On the other hand, temperature increases, the solubility of small particles and large particles up to degree increase, these will reduce the stability of dispersion. Therefore, good preparation should dye solution temperature is low, the heating time should be avoided before dyeing dye. Generally into the dye 40 ~ 50 , about 0.5 / min heating to boiling. According to Dye and the exhaust dyeing conditions, and then washed insulation.
Disperse dyes on nylon and polyurethane can also dye. Dye in the active group and a large number of PA6 amide molecules and molecular end-amino-through hydrogen bonding, van der Waals force, and even strongly to the dyeing and fixation. In addition, PA6 molecule contains a large number of non-polar hydrophobic hydrocarbon chain, which is hydrophobic disperse dyes to dye the reason Jin Hua. Disperse small molecular weight, diffusion properties, staining method is simple, with good levelness, light fastness good coverage are better able to avoid the aggregation of components due to the size of nylon and stretch different or different when spinning phenomenon caused by uneven staining. However, dyed with disperse PA6, the saturation is low, stained dark difficult.
Disperse dyes on PU has good color, which is its own molecular structure of polyurethane foam and more closely related to the structure. PU synthetic leather fabric surface and form a not entirely coherent within the polymer membrane, the structure of the soft segment and hard segment composition. Some loose structure of soft segment is the main location of disperse dye. Polyurethane absorption of Disperse Dyes large residual dye stain less residue, which use high-power applications of disperse dyed dark color when it is very necessary. Within a certain range, with the dyeing temperature increased, a larger color yield. In addition, the disperse dyes in polyurethane on the color fastness is also good.
In the island composite fiber synthetic leather dyeing, disperse dyes are the main types of dyed PU. In contrast, other types of dyes to color some of the polyurethane poor, instead of the nylon color; some Although polyurethane has better color, but color of nylon, which even for the dye system light, no color difference in the finished product is very unfavorable. Even the dyes, the amount should also pay attention on the controls, because of its color nylon will not only affect the hue, but also affect the color fastness of nylon.
I am China Manufacturers writer, reports some information about the pencil grip , rubber shoe cover.
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