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Polyester-Nylon Microfiber Dyeing

Disperse dyestuff for polyester fiber also adsorbs well to nylon fiber, however, the wet and light fastnesses of the dyestuff adsorbed on nylon tend to be poor. In order to attain good fastness in the dyeing of polyester/nylon, it is therefore preferable that the polyester component is dyed with disperse dyestuff with care taken in minimizing its adsorption to (staining on) the nylon component, which can then be dyed with dyestuff that is usually used for nylon with good fastness.

Dyeing at 110°C using a carrier will be effective as a disperse dyeing method for polyester/nylon, in which a deeper shade on the polyester component is produced and dyestuff adsorption to the nylon component is inhibited to a degree that is only regarded as staining. This method allows the dyeing of polyester using disperse dyestuff and nylon with the usual dyestuff for nylon, and makes possible solid dyeing or multiple color dyeing.

1. Dyeing recipe

As a practical dyeing recipe, the following two-bath method is recommended.

[1st bath: Dyeing of polyester]

[Procedure]

1. The substrate (polyester/nylon) is treated in a bath containing a carrier and pH-adjusting agent at 50°C for about 10 minutes.
2. Dispersing agent and disperse dye solution are then added and the temperature is raised to 110°C to carry out dyeing under the high-temperature conditions for dyeing with the use of a carrier.
3. Reduction cleaning is carried out after dyeing so that disperse dye staining on nylon can be stripped as much as possible.

[2nd bath: Dyeing of nylon]

[Procedure]

1. The dyeing of the nylon component is carried out under the usual dyeing conditions for 100% nylon.
2. Fixing is carried out for improved wet fastness, if necessary.

2. Dyestuff used

2-1. Disperse dyestuff

Selected are disperse dyestuffs which can dye well with the use of a carrier and produce minimum staining on nylon or display good fastness on nylon. SE-type dyestuffs are mainly selected for good adsorption to polyester and production of little staining on nylon.

The following are examples of recommended items.

 

Sumikaron Yellow SE-4G Sumikaron Orange SE-RPD Sumikaron Rubine SE-RPD Sumikaron Blue SE-RPD(N)

Sumikaron Yellow E-RPD(E) Sumikaron Red E-RPD(E) Sumikaron Bordeaux SE-BL(A) Sumikaron Blue S-BG200%

Sumikaron Yellow SE-RPD Suymikaron Red SE-RPD Sumikaron Blue E-RPD(E) Sumikaron Turq.Blue S-GL200%

2-2. Dyestuff for nylon

Selected are acid or metal-complex acid dyestuffs which can dye nylon well and display superior fastness levels. The following are examples of items recommended.

 

Aminyl Yellow E-3GL Aminyl Blue E-2GL Aminyl Yellow FD-5GL Aminyl Rubine FD-BL Aminyl Cyanine 5R(N) Lanyl Yellow G ex.cc. Lanyl Brown R

Aminyl Yellow E-RL Suminol Fast Blue PR Aminyl Yellow FD-3RL(N) Aminyl Blue FD-GL Aminyl Green F-3GL Lanyl Orange R 200% Lanyl Brown GR(N)

Aminyl Red E-3BL Aminyl Red FD-3BL(N) Aminyl Navy FD-RL Aminyl Black F-GL Lanyl Red B Lanyl Grey B

3. Dyeing auxiliary used

3-1. Carrier

Carriers for polyester are used, mainly those which are methylnaphthalene-based.

3-2. Dispersing agent

Dispersing agents that produce superior effects at high temperatures are used rather than dispersing/leveling agents.

3-3. Reduction clearing agent

Nonionic/amphoteric-type surfactants for reduction clearing of 100% polyester are used.

3-4. Leveling agent for nylon

Leveling agents for 100% nylon are used.

3-5. Fixing agent for nylon

Selection should be made mainly focusing on acid dye fixing properties.

The basic ideas of the technology above were made public by Sumitomo Chemical in the form of technical information, ‘Technology of multiple color dyeing for polyester/nylon union weaves’.