阅读说明：本技术 一种棉针织布用环保无污染型硫化黑快速染色工艺 (Environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabric ) 是由 邹其光 李红彪 李中全 于 2020-08-04 设计创作，主要内容包括：本发明公开一种棉针织布用环保无污染型硫化黑快速染色工艺,包括步骤：1)染缸加入耐碱渗透剂、盐和烧碱按照前处理工艺升温并保温；2)副缸进冷水并打开搅拌器,依次加入烧碱、硫化黑染料、环保还原剂复配物,并搅拌升温确保硫化黑染料完全被还原成隐色体；3)染缸加入开好的硫化黑染料,升温并保温后按照布种选择合适的降温速率降温,降温运行过程中加入速洗酶；4)把染液排入染液回收装置,待下次染色继续使用；5)洗水、过酸；6)按照皂洗工艺皂洗,皂洗后洗干净出缸。本发明解决了棉针织布硫化黑染色存在的工艺时间长,气味大,污染严重的问题,同时一定程度改善了硫化黑染色后布面效果偏差的问题。(The invention discloses an environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabric, which comprises the following steps: 1) adding an alkali-resistant penetrating agent, salt and caustic soda into the dye vat according to a pretreatment process, heating and preserving heat; 2) feeding cold water into the auxiliary tank, starting a stirrer, sequentially adding a compound of caustic soda, sulfur black dye and an environment-friendly reducing agent, stirring and heating to ensure that the sulfur black dye is completely reduced into a leuco body; 3) adding the opened sulfur black dye into the dye vat, heating and preserving heat, then selecting a proper cooling rate according to the cloth type, cooling, and adding the quick washing enzyme in the cooling operation process; 4) discharging the dye liquor into a dye liquor recovery device for continuous use in next dyeing; 5) washing water and peracid; 6) soaping according to the soaping process, and cleaning and taking out of the tank after soaping. The invention solves the problems of long process time, big smell and serious pollution existing in the sulfur black dyeing of the cotton knitted fabrics, and simultaneously improves the problem of cloth cover effect deviation after sulfur black dyeing to a certain extent.)

1. An environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabric is characterized by comprising the following steps:

1) boiling and permeating: adding an alkali-resistant penetrating agent, salt and caustic soda into the dye vat according to a pretreatment process, heating and preserving heat;

2) sulfur black dye starting: feeding cold water into the auxiliary tank, starting a stirrer, sequentially adding a compound of caustic soda, sulfur black dye and an environment-friendly reducing agent, stirring and heating to ensure that the sulfur black dye is completely reduced into a leuco body;

3) dyeing: adding the opened sulfur black dye into the dye vat, heating and preserving heat, then selecting a proper cooling rate according to the cloth type, cooling, and adding the quick washing enzyme in the cooling operation process;

4) dye liquor recovery: directly discharging the dye liquor into a dye liquor recovery device, and continuously using the recovered dye liquor for next dyeing;

5) washing: washing water and peracid;

6) soaping: soaping according to the soaping process, and cleaning and taking out of the tank after soaping.

2. The environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics according to claim 1, characterized in that in the step 1), the dosage of the alkali-resistant penetrating agent is controlled to be 0.5-1% (owf), the dosage of the salt is controlled to be 10-15% (owf), the dosage of the caustic soda is controlled to be 2% (owf), and the pretreatment process condition is 98-105 ℃ x 30-10 minutes.

3. The process of claim 1, wherein in step 2), the amount of caustic soda is 2% (owf), the amount of sulfur black dye is 10-14% (owf), the amount of environment-friendly reducing agent is 5-6% (owf), the cutting temperature is 80-90 ℃, and the stirring time is 10-20 minutes.

4. The environment-friendly pollution-free sulfur black quick dyeing process for cotton knitted fabrics according to claim 1, characterized in that in the step 3), the dyeing process is carried out at 98 ℃ for 60 minutes, the temperature is reduced to 60 ℃ after dyeing, the dosage of the quick washing enzyme added in the operation process is 0.5-1.0%, and the adding time is 20-30 minutes.

5. The environment-friendly pollution-free sulfur black quick dyeing process for cotton knitted fabrics according to claim 1, characterized in that in the step 4), the dye liquor can be directly recycled to the dye liquor recycling device after the quick washing enzyme feeding is finished, and the subsequent dyeing is recycled.

6. The environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics according to claim 1, characterized in that in the step 5), 1-2 cylinders of washing water are adopted.

7. The environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics according to claim 1, characterized in that in the step 6), the soaping process conditions are as follows: the amount of soaping agent was 1% (owf), 80 ℃ for 15 minutes.

8. The environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics according to claim 1, characterized in that the cotton knitted fabrics are 21-40 cotton knitted fabrics.

9. The environment-friendly pollution-free sulfur black rapid dyeing process for the cotton knitted fabric according to claim 8, wherein the cotton knitted fabric is made of plain cloth, sweater cloth or rib cloth.

Technical Field

The invention relates to an environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics, and belongs to the technical field of textile fabric processing.

Background

Sulfur dyes are one of the most widely used dyes today, and the worldwide production of sulfur dyes is reported to reach several hundred thousand tons, and the most important of them is sulfur black dyes. At present, the yield of the sulfur black accounts for 75-85% of the total yield of the sulfur dye, and the sulfur black is popular with various printing and dyeing manufacturers due to simple synthesis, low cost, better fastness and no carcinogenicity. The dye has wide application in dyeing cotton and other cellulose fibers, and is most widely applied in black series.

The sulfur dye dyeing process needs to reduce the dye into a leuco body before dyeing the fiber, and because the sodium sulfide has strong reducing capability and low price, most of the current sulfur black dyeing still adopts sodium sulfide as a reducing agent, and the sodium sulfide dosage is basically excessive, excessive parts can not only produce sulfur-containing sewage and pollute the environment, but also release hydrogen sulfide gas and harm the health of human beings, so the sulfur dye environment-friendly dyeing technology becomes the focus of industrial research.

In the current development situation of the industry, research on sulfur dye reducing agents mainly focuses on: research and development of reducing agents with low sulfur content or completely no pollution to the environment are carried out, and some substitutes of sodium sulfide, such as sodium hydrosulfite, thiourea dioxide, mercaptan, glucose and the like, are also found in the research process. From the theoretical perspective, the above substitutes can approach the reduction effect of sodium sulfide, but due to the limitation of factory production conditions or high process requirements, when the substitutes are applied to the batch production of printing and dyeing enterprises, a plurality of unstable factors are encountered, such as light color, colored flower, colored stain, erythema, color misregistration and the like, and the currently applied dyeing process of black vulcanized knitted fabrics in factories, including the most applied alkali sulfide dyeing process, has the phenomena of long dyeing time, large odor, cloth cover effect deviation, serious pollution discharge and the like.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an environment-friendly pollution-free sulfur black rapid dyeing process for cotton knitted fabrics, which solves the problems of long process time, large smell and serious pollution existing in sulfur black dyeing of cotton knitted fabrics, and simultaneously improves the problem of cloth cover effect deviation after sulfur black dyeing to a certain extent.

In order to achieve the purpose, the environment-friendly pollution-free sulfur black rapid dyeing process for the cotton knitted fabric comprises the following steps:

1) boiling and permeating: adding an alkali-resistant penetrating agent, salt and caustic soda into the dye vat according to a pretreatment process, heating and preserving heat;

2) sulfur black dye starting: feeding cold water into the auxiliary cylinder, opening a stirrer, sequentially adding a compound of caustic soda, a sulfur black dye and an environment-friendly reducing agent (namely, Baozu, adopting QH-2804 produced by Zhanfeng company in Guangdong), and stirring and heating to ensure that the sulfur black dye is completely reduced into a leuco body;

3) dyeing: adding the opened sulfur black dye into the dye vat, heating and preserving heat, then selecting a proper cooling rate according to the cloth type, cooling, and adding the quick washing enzyme in the cooling operation process;

4) dye liquor recovery: directly discharging the dye liquor into a dye liquor recovery device, and continuously using the recovered dye liquor for next dyeing;

5) washing: washing water and peracid;

6) soaping: soaping according to a normal soaping process, and cleaning and taking out of the tank after soaping.

Preferably, in the step 1), the dosage of the alkali-resistant penetrating agent is controlled to be 0.5-1% (owf), the dosage of the salt is controlled to be 10-15% (owf), the dosage of the caustic soda is controlled to be 2% (owf), and the pretreatment process condition is 95-105 ℃ for 30-10 minutes.

Preferably, in the step 2), the amount of the caustic soda is 2% (owf), the amount of the sulfur black dye is 10-14% (owf), the amount of the environment-friendly reducing agent compound is 5-6% (owf), the cutting temperature is 80-90 ℃, and the stirring time is 10-20 minutes.

Preferably, in the step 3), the dyeing process is carried out at 98 ℃ for 60 minutes, the temperature is reduced to 60 ℃ after dyeing, the dosage of the quick-washing enzyme added in the operation process is 0.5-1.0%, and the adding time is 20-30 minutes.

Preferably, in the step 4), the dye liquor can be directly recycled to the dye liquor recycling device after the quick-washing enzyme feeding is finished, and the dye can be saved by 15-20% after the subsequent dyeing is recycled, so that the sewage discharge amount is greatly reduced.

Preferably, in the step 5), washing water is 1-2 cylinders, a shower head function is recommended to be turned on in the washing process, the cloth cover is cleaned, the 1 cylinder is neutralized for 20 minutes at 50 ℃, and the residual alkali on the cloth cover and the fiber core is neutralized.

Preferably, in the step 6), the soaping process conditions are as follows: the amount of soaping agent was 1% (owf), 80 ℃ for 15 minutes.

Preferably, the cotton knitted fabric is 21-40 cotton knitted fabric.

Preferably, the cotton knitted fabric is made of plain cloth, sweater cloth or rib cloth.

Preferably, the cotton knitted fabric sulfur black dyeing process is suitable for common equipment of printing and dyeing factories such as a gas-liquid dyeing machine, a water flow dyeing machine and an overflow dyeing machine.

The mechanism of the invention is as follows:

the dyeing process of the sulfur black dye comprises the following steps: reducing water-insoluble sulfur black into water-soluble sulfur black leuco body by a reducing agent, dyeing fibers by the leuco body, and oxidizing the leuco body into water-insoluble sulfur black to be fixed on the fibers by an oxidizing agent after the leuco body is dyed on the fibers.

The commonly used reducing agent is sodium sulfide, which readily generates malodorous hydrogen sulfide. According to the environment-friendly pollution-free quick dyeing process for sulfur black, disclosed by the invention, the environment-friendly reducing agent compound is Huanbu QH-2804 developed by Zhanfeng company in Guangdong, and is prepared by uniformly mixing vitamin C, sucrose and glucose in a powder mixer according to the mass ratio of 1:4:5, so that the product is completely free of sulfur, sulfur dyes are dissolved, hydrogen sulfide with malodor cannot be generated in the dyeing process, the comfort of the production environment is improved, and the environment-friendly pollution-free quick dyeing process is an ideal substitute for sodium sulfide.

The oxidant commonly used is dissolved oxygen in water, which is limited and requires a large amount of water and time for oxidation. The environment-friendly pollution-free fast dyeing process of the sulfur black has the advantages that the fast washing enzyme is a biological enzyme preparation product 1639 produced and provided by Novixin corporation, the environment is not polluted, the action specificity of the enzyme is utilized, 1639 added in the dyeing solution can convert the retastatin QH-2804 into oxygen in a short time, and an oxidant required by oxidation of leuco is provided, so that the water amount and the oxidation time of oxidation washing water are reduced.

The environment-friendly pollution-free sulfur black rapid dyeing process of the invention is based on the existing cotton knitted fabric sulfur black dyeing process, adopts the element QH-2804 to replace sodium sulfide to reduce sulfur black dye, and the element QH-2804 is a compound of novel environment-friendly reducing agents, is non-toxic, tasteless, sulfur-free and phosphorus-free; the invention utilizes the quick washing enzyme to avoid the oxidation process of washing water, saves more than 8 tons of water for producing one ton of dyed cloth, and shortens the process flow by more than 1 hour; the invention utilizes the dye liquor recovery device (a conventional large liquid storage device) to recover the residual dye liquor after dyeing, can repeatedly dye and be recycled, greatly reduces the sewage discharge, recovers the dye liquor, and can save the sulfur black dye by 15-20 percent after being repeatedly utilized.

Drawings

FIG. 1 is a process flow diagram of one embodiment of the present invention.

Detailed Description

The sulfur black dyeing of the cotton knitted fabrics is rapid, environment-friendly and pollution-free, and the cloth cover effect is superior to the effect of the traditional sulfur black dyeing process. Firstly, the invention selects environment-friendly reducing agent raw materials for research, development and compounding; secondly, a novel fast washing enzyme is developed, the dyeing production process is optimized, the step of washing water oxidation is omitted in the sulfur black dyeing process, and the process time is shortened; and thirdly, a dye liquor recovery device is installed, so that residual dye liquor after dyeing is recycled, and the dye consumption is saved, thereby saving the production cost.

In order that the above-recited effects, features and process advantages of the present invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.