阅读说明：本技术 一种无水还原性染色工艺 (Waterless reductive dyeing process ) 是由 叶家龙 严华 严诚 于 2021-03-31 设计创作，主要内容包括：本发明公开了一种无水还原性染色工艺,使被染面料进过专用的界面剂接枝烘干透风冷却,进入喷雾染色箱体,再进入臭氧箱进行强氧化反应使染料形成显色题。本发明涉及布料染色技术领域,与现有技术相比的优点在于：低污染、低能耗、经济效益优良。(The invention discloses an anhydrous reductive dyeing process, which comprises the steps of enabling a dyed fabric to enter a special interface agent for grafting, drying, ventilating and cooling, enabling the fabric to enter a spray dyeing box body, and enabling the fabric to enter an ozone box for strong oxidation reaction to enable a dye to form a color problem. The invention relates to the technical field of cloth dyeing, and compared with the prior art, the invention has the advantages that: low pollution, low energy consumption and good economic benefit.)

1. An anhydrous reductive dyeing process is characterized by comprising the following steps:

step one, carrying out cationic grafting modification treatment on a dyed fabric;

step two, drying the modified dyed fabric, and cooling to room temperature;

step three, in a closed environment filled with nitrogen, uniformly spraying the reductive dye by spraying nitrogen as a carrier and infiltrating the dyed fabric obtained in the step two;

step four, placing the dyed fabric obtained in the step three in a closed ozone chamber for strong oxidation reaction;

and step five, repeating the steps one to four for a plurality of times to obtain the dyed fabric.

2. The anhydrous reductive dyeing process according to claim 1, wherein: the cationic grafting modification treatment in the step one is to soak the dyed fabric into the high molecular cationic modifier for 5-60 min.

3. The anhydrous reductive dyeing process according to claim 1, wherein: the concentration of the nitrogen in the third step is more than or equal to 99 percent.

4. The anhydrous reductive dyeing process according to claim 1, wherein: and in the third step, after the dyed fabric is subjected to dip dyeing by the reducing dye, standing for at least 30-60s in a nitrogen environment.

5. The anhydrous reductive dyeing process according to claim 1, wherein: in the fourth step, the concentration of ozone in the ozone chamber is more than or equal to 99 percent.

6. The anhydrous reductive dyeing process according to claim 1, wherein: the number of times in the fifth step is 4-6 times.

Technical Field

The invention relates to the technical field of cloth dyeing, in particular to an anhydrous reductive dyeing process.

Background

The conventional dyeing process for reducing the comprehensive reductive dye processed in the current market places is to reduce the conventional dyeing into a leuco body, or a suspension body (the suspension body dyeing is to attach consumed dye particles to a dyed fabric firstly, then padding reducing liquid is carried out, and the dye is fully reduced into the leuco body through a reduction steam box, so that the energy consumption is large and the dyeing is unstable) carries out affinity reaction on fibers, and the fibers are oxidized to generate the required color, and then a large amount of water washing processes are carried out to remove the surface flooding of the fabric, so that the dyeing fastness is achieved. The dyeing carried out by the above process therefore results in the production of large amounts of waste water, and the open treatment environment causes a certain pollution of the ambient air due to the contact with air in the air for oxidation, and also a large amount of radiation after the subsequent dyeing.

In the actual production process, the sewage amount of one traditional textile equipment is about 120 tons basically, the pollution of the waste water is mainly organic pollution, the concentration of the pollutants is high, the pollutants in the waste water are mainly second-class harmful substances, and the general waste water treatment facilities are difficult to reach higher discharge standards. Therefore, the printing and dyeing process which can generate a large amount of waste water is not favorable for realizing the national environmental protection requirement, and the treatment of the waste water can also lead to the reduction of the economic benefit for enterprises. Therefore, an anhydrous dyeing process capable of avoiding wastewater discharge is needed.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the technical defects and provides the anhydrous reductive dyeing process with low pollution, low energy consumption and excellent economic benefit.

The application provides an anhydrous reductive dyeing process, which comprises the following steps:

step one, carrying out cationic grafting modification treatment on a dyed fabric;

step two, drying the modified dyed fabric, and cooling to room temperature;

step three, in a closed environment filled with nitrogen, uniformly spraying the reductive dye by spraying nitrogen as a carrier and infiltrating the dyed fabric obtained in the step two;

step four, placing the dyed fabric obtained in the step three in a closed ozone chamber for strong oxidation reaction;

and step five, repeating the steps one to four for a plurality of times to obtain the dyed fabric.

Preferably, the cationic graft modification treatment in the step one is to soak the dyed fabric into the high molecular cationic modifier for 5-60 min.

Preferably, the concentration of the nitrogen in the third step is more than or equal to 99 percent.

Preferably, in the third step, after the dyed fabric is subjected to exhaust dyeing by the reducing dye, the dyed fabric is kept still for at least 30-60s in a nitrogen environment.

Preferably, the ozone concentration in the ozone chamber in the fourth step is more than or equal to 99%.

Preferably, the number of times in step five is 4-6 times.

Compared with the prior art, the process has the advantages that:

1. no matter the anhydrous reductive dyeing process is used for material melting, no wastewater is discharged in the dyeing process, and the high-pressure atomization of nitrogen to the dye is carried out under the protection of nitrogen, so that the dye to be dyed is fully absorbed by cotton cloth cotton yarn, and the required color fastness can be achieved without washing, therefore, the process is very environment-friendly, changes the original high pollution and high energy consumption, and is greatly helpful for environmental pollution;

2. the dyeing rate is obviously high after the process of the invention is used for dyeing, a large amount of polymerization reaction among the floating color uniform ions and affinity reaction between the dye and fiber completely carry out the dye on a required dyed fabric, the required color fastness can be achieved without washing and floating color, and the color fastness is improved by one to two levels compared with the conventional dyeing, so the cycle times required by the process in the aspect of repeated dyeing are less than that required by the common process, and the process has excellent economic benefit.

Drawings

FIG. 1 is a process flow diagram of the anhydrous reductive dyeing process of the present invention.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the invention, which is further described with reference to the accompanying drawings and embodiments.

For the purpose of understanding this example, a detailed description of an anhydrous reductive dyeing process used in the present invention during actual processing is provided below.

Example 1:

referring to fig. 1, taking cotton yarn as an example, a cotton yarn needs to be dip-dyed with a reductive dye such as indigo to make cotton yarn jean, and the specific steps are as follows:

firstly, carrying out cationic graft modification treatment on a dyed fabric, namely cotton yarn, and specifically soaking the cotton yarn in a high-molecular cationic modifier for 30 min; the cationic modifier adopts cationic quaternary ammonium salt polymer which is a compound with reactive functional groups, is mainly used for the novel process of dyeing the ready-made clothes coating of the cellulose fiber and dyeing the ready-made clothes coating with direct and active dyes in one bath, and has the principle that the anionic dyed fabric is modified into cation which can be combined with anionic reductive dye in a replaceable way, so the cationic graft modification treatment adopted in the scheme mainly increases the dyeing rate of dyeing.

And step two, raising the temperature of the modified dyed fabric to 80 ℃ for drying treatment, drying for 10min, and cooling to room temperature after drying, thus finishing the pretreatment of the prepared materials. And step two, drying the cationic modifier in the step one and cooling the dyed fabric, so as to facilitate the coloring of the next process.

And step three, in a closed nitrogen chamber filled with nitrogen with the concentration of 99%, uniformly spraying the reductive dye by taking nitrogen with the concentration of more than or equal to 99% as a carrier, infiltrating the dyed fabric obtained in the step two, enabling the dyed fabric to pass through a traction padder, and standing for 30 seconds. The spraying of the reducing dye is to use compressed nitrogen or high-pressure nitrogen as a gas spraying carrier, so that high-speed gas flow drives reducing dye molecules to be sprayed onto the dyed fabric, and the dyed fabric is uniformly and transparently colored by subsequently entering a traction padder. In the scheme, the nitrogen gas is used for protecting the dye and the fiber from affinity reaction and ionic polymerization under the condition of a leuco body so as to improve the dyeing rate, and the nitrogen gas is inert gas and has a protection function of preventing the dye and the fiber from oxidation reaction in the stage so as to prevent the depth of dip dyeing. The dyeing dye directly sprays and colors the fiber, and the fiber is uniformly extruded in a padder under the environment of nitrogen protection, so that the water mist on the surface of the fiber can completely enter the fabric to be dyed, and then enters an oxidation stage after thirty seconds of reaction time.

And step four, performing a color fixation oxidation stage, namely placing the dyed fabric obtained in the step three after dip dyeing in a closed ozone chamber for strong oxidation reaction, wherein the concentration of ozone in the ozone chamber is more than or equal to 99%, performing dye formation color development through the strong oxidation reaction of ozone, fully oxidizing the oxidized fabric in a closed space, and compared with the conventional dyeing air contact oxidation, the color fixation effect is better, and a large amount of air pollution is not caused to the production environment.

And step five, repeating the steps five times to obtain the dyed fabric. Compared with the traditional dyeing method which needs padding for 10-12 times, the method has the advantages that the needed coloring cycle times are less, and the consumed dye is less.

Finally, the dyed fabric can be directly dried, enters a yarn storage rack, is sized, is dried, is subjected to leasing, is taken up and is rolled, and water washing is not needed in the post-treatment process, while the traditional dyeing process needs a large amount of water washing to remove loose color and is dried, so the scheme can completely realize anhydrous printing and dyeing.

The invention and its embodiments have been described above, without limitation, and what is shown in the drawings is only one of the embodiments of the invention, to which the actual structure is not limited. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.