The deficiency of disperse dyes in disseminated-Iota

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News > Dynamic industry > The deficiency of disperse dyes in disseminated

The deficiency of disperse dyes in disseminated

First, there is the heat coagulation.
Dispersed dye water soluble little, is almost entirely dependent on the dispersion (diffusion) agent of the coating, the formation of hydrophilic dye particles, can be dispersed in water. However in the heating, heat preservation and cooling process, the dye particles due to the double effect of high temperature and dye shear force, dyes and disperse agent between the "union" will gradually decline, and even rupture. The grain of the free will change into the large dye aggregates because of the exclusion of water.. As a result, the light will make the color bright brilliant and dyeing fastness of decline, severe and dye polyester oligomer and cilia, suspended solids gathered together to form a tar like substance, adhered to the fabric, can not be eliminated "tar spot."
Response measures:
(1) according to the detection, the thermal coagulation is ubiquitous in common disperse dyes. But the degree of weight is obviously different. So should choose aggregation tends to be small, if the dye aggregates should be selected with the extension of time easy to depolymerization of the dye. Not easy to dye aggregation and difficult to use in the dip in the depolymerization. To this end, the dye before use to be detected.
(2) to selection and to impose high temperature and good dispersibility of dispersing and leveling agent, to improve the dye grain in high temperature dyeing bath dispersion stability.
The commercially available high temp three:
One is the anionic dispersing and leveling agent. The dispersing and leveling agent, usually has two disadvantages: with dye grain between "union" is low, so in the period of low dispersing ability is good, but with improvement of dyeing temperature, thermal motion intensifies, the original form of the dye particles, easily broken and lost dispersion stability; II of dye adsorption color lack of retarding function, on interfacial migrati lack of promotion.
The two is a non-ionic dispersing and leveling agent. The dispersing and leveling agent due to the lack of the outer layer of the dye and the formation of colloidal particles with charge repulsive force, so the dye dispersion ability than anionic dispersing and leveling agent. But because it can and dye binding into unstable polymer, in the dyeing process and then slowly release, so this kind of dispersing and leveling agent not only has action of dispersing and stabilizing, and slow staining dye transfer function. The disadvantage is the amount of time will reduce the amount of partial color.
The three is the compound of anionic / non-ionic dispersing and leveling agent. This kind of dispersing and leveling agent is mixture of anionic and nonionic surfactant two, has good synergistic effect. Due to the formation and dye particles with electric double layer, so the protective effect of stronger on grain size of dye, dispersion is more stable. Moreover, it has good slow dyeing, migration and dyeing function, and has relatively little influence on the dyeing rate..
Obviously, the anionic / nonionic dispersing and leveling agent for high temperature.
Second, alkali stability.
In the high temperature and high pressure dyeing dyeing dyeing bath, once the pH value of >6, it will produce significant color difference and depth even serious difference. At pH > 6 high temperature (100 DEG C above) dye bath in, dye molecular structure of some alkali poor stability of groups, such as ester, nitrile, amide will hydrolysis occurs, cause dye chromogenic system destruction, is the main reason. Disperse S-3BG (B79 C.L) and disperse scarlet R S (C.I.R74) are typical representatives in common disperse dyes..
Response measures:
The key measure of the response is the buffer capacity, buffer large pH buffer system, such as sodium acetate. The pH value of the dye bath was stable in the weak acid range from beginning to end (pH= "4 to 5) staining.. Instead of ammonium sulfate or ammonium acetate as pH modulator. Because they are 2 ~ pH, >6 3g/L.
If single acetic acid adjust pH value, the proposed dosage is appropriate, available glacial acetic acid 0.5ml / L (pH=4 ~ 4.2). Otherwise it is difficult to remove the influence of the alkaline material brought to the pH value of the dye bath, in order to maintain the stability of the dye bath pH value.
Third, there is thermal mobility.
Heat transfer refers to the behavior after polyester fiber dyeing, after heat treatment, originally dyed polyester dye will migrate to the surface of polyester. Thermal mobility is a physical property of disperse dyes.. It is worth noting that the thermal behavior of different disperse dyes is different in size.. Therefore, in the dry heat after finishing, such as flexible setting, waterproof amorphous, resin finishing), due to thermal dye transfer amount how many different, in the dyeing fastness of decline at the same time, fabric color also the mutation occurs. Appear out of the cylinder shade match, colour fastness, qualified, and the finished product is light "go partial, fastness low phenomenon, must rework repair quality problems.
Response measures:
(1) the key measure is dye dyeing with small heat transfer property and high washing fastness.. The dye molecular weight larger of polyester with high affinity, even in more than 150 DEG C high temperature hot and dry conditions it is difficult to from the inner fiber to fiber surface migration. The thermal migration of small, high washing fastness, light discoloration after finishing.
(2) due to surface active agent on heat transfer of disperse dyes with size different role, so in the dyeing process, the use of surface active agent should adhere to the "can not is not, can use less is less. Non use, the species should choose, the water clean principle.
(3) silicone emulsion type softening agent has a certain amount of nonionic emulsifier. The presence of nonionic emulsifier on the fiber, the thermal migration of disperse dyes is serious.. So should choose white type emulsifier free softener, without emulsion softener.

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