CN110804855A - Efficient stripping method for waste cotton textiles - Google Patents
Efficient stripping method for waste cotton textiles Download PDFInfo
- Publication number
- CN110804855A CN110804855A CN201911149516.1A CN201911149516A CN110804855A CN 110804855 A CN110804855 A CN 110804855A CN 201911149516 A CN201911149516 A CN 201911149516A CN 110804855 A CN110804855 A CN 110804855A
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- CN
- China
- Prior art keywords
- waste cotton
- cotton textiles
- textiles
- waste
- sodium hypochlorite
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Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
- D06L4/22—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents
- D06L4/23—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using hypohalogenites
Abstract
A high-efficiency stripping method for waste cotton textiles belongs to the field of textile printing and dyeing processing, and comprises the steps of immersing the waste cotton textiles in a sodium hypochlorite aqueous solution, hanging the immersed waste cotton textiles in a normal-temperature environment, and washing the waste cotton textiles with clear water after the waste cotton textiles fade to obtain decolored waste cotton textiles. The method does not need to adjust the pH value of the decoloring solution and perform prior crushing treatment on waste cotton textiles such as yarns or fabrics, can keep the fibers in the fabrics from being damaged, and is beneficial to the subsequent re-spinning process. The method is carried out under the condition of low temperature without heating, thereby effectively reducing energy consumption and reducing the burden of wastewater treatment while providing the same whiteness for the fabric.
Description
Technical Field
The invention belongs to the field of textile printing and dyeing processing, and particularly relates to the technical field of recycling of textiles such as waste cotton fabrics or cotton yarns.
Technical Field
Along with the development of textile industry and the improvement of living standard of people, the materials are greatly enriched, people pay more attention to chasing up the trend, so that the service cycle of textiles is shortened, and the quantity of waste textiles is continuously increased. They are mostly incinerated and buried, which is not only a waste of resources but also a heavy burden on the environment.
Cotton fiber is one of the most important textile raw materials and is also the highest yield natural fiber. Because of the characteristics of excellent moisture absorption and air permeability, good hand feeling and strength, and the like, the fabric is always favored by people. Therefore, pure cotton and cotton-containing textiles account for a large proportion of waste textiles. In recent years, with the enhancement of environmental awareness of people, the recycling of cotton fabrics and cotton yarns draws great attention at home and abroad.
In the process of recycling waste cotton fabrics and cotton yarns, the subsequent use of the waste cotton fabrics and cotton yarns is influenced by the existing color of the fabrics or yarns. Therefore, the waste textiles need to be stripped on the premise of not influencing the application performance of the waste textiles.
At present, most researches on the problem of textile color stripping are carried out on the repair color stripping of dyed defective fabrics and the color stripping of printing and dyeing wastewater, and the color stripping is generally carried out by adopting a sodium hydrosulfite reduction method and a hydrogen peroxide oxidation method, but the sodium hydrosulfite has the defects of poor stability, weak reducibility, release of sulfur dioxide gas and the like, and the hydrogen peroxide stripping has the defects of high color stripping temperature, high alkali content in wastewater and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an efficient stripping method for waste cotton textiles.
The technical scheme of the invention is as follows: the waste cotton textiles are soaked in a sodium hypochlorite aqueous solution, hung in a normal-temperature environment, washed by clean water after the waste cotton textiles fade, and the decolored waste cotton textiles are obtained.
Sodium hypochlorite is the most common "chlorine" bleach that can be used in household washing. The method takes the sodium hypochlorite aqueous solution as the decoloring solution, does not need to add other chemical additives, does not need to adjust the pH value of the decoloring solution, does not need to carry out prior crushing treatment on waste cotton textiles such as yarns or fabrics and the like, can keep the fibers in the fabrics from being damaged, and is beneficial to the subsequent re-spinning process.
The waste cotton textiles are soaked in a sodium hypochlorite solution for a period of time, and then fade after a period of time. After the discoloration, sufficient water washing is required to remove residual chlorine.
The stripping system can be used for low-temperature stripping of waste cotton textiles, and the method can be used for high-efficiency stripping of the waste cotton textiles at normal temperature, so that the aims of saving energy, saving water source, shortening process time, reducing sewage discharge and improving textile quality are fulfilled. Compared with the conventional oxygen bleaching system, the method is carried out under the condition of low temperature without heating, so that the energy consumption can be effectively reduced and the wastewater treatment load can be reduced while the same whiteness is provided for the fabric.
Furthermore, the concentration of the sodium hypochlorite aqueous solution is 200-400 g/L. When the concentration is lower than 200g/L, the stripping effect is poorer in the same stripping time, and if the stripping effect is better, the stripping time is longer. When the concentration is higher than 400g/L, the stripping effect can be quickly achieved, but the strength of the textile is seriously lost, so that the subsequent use is influenced.
The dipping time is 3-5 minutes, so that the textile is completely soaked, and the dipping time can be properly adjusted according to the thickness, the density or the fineness of the yarn and the like of the textile. The time is less than 3 minutes, the impregnation is incomplete, and the complete color stripping is not facilitated; longer than 5 minutes, the impregnation was complete and the impregnation time continued to be longer, but there was no reinforcing effect on the stripping.
The hanging time is 9-16 minutes, and the hanging time can be properly adjusted according to the color depth of the waste cotton textiles. The hanging time is less than 9 minutes, the fabric is not stripped sufficiently, when the hanging time of the waste cotton textiles reaches 16 minutes, the stripping effect and the strength loss of the waste cotton textiles can meet the requirements of subsequent dyeing and finishing processing, the time is continuously prolonged, the stripping effect of the waste cotton textiles is better, but the strength loss of the waste cotton textiles is serious, and the subsequent use is influenced.
Detailed Description
The outstanding advantages and salient features of the invention are further illustrated below by way of examples, but the invention is by no means limited to the following examples.
Example 1:
the processing object is as follows: the fineness of the pure cotton yarn dyed by the reactive dye is as follows: 150 tex.
Sodium hypochlorite aqueous solution for treatment: the concentrations were 100g/L, 200g/L, 300 g/L, and 400g/L, respectively.
The bath ratio of the yarn to the sodium hypochlorite aqueous solution is 1: 50 during the impregnation.
Temperature of impregnation and suspension: and (4) room temperature.
The process of the invention comprises the following steps: soaking the pure cotton yarn dyed by the reactive dye in a sodium hypochlorite aqueous solution, hanging the yarn in a normal temperature environment, and washing the yarn with clear water after the yarn is faded to obtain the decolored yarn.
The traditional soaking bleaching process comprises the following steps: the pure cotton yarn dyed by the reactive dye is dipped in sodium hypochlorite aqueous solution until being completely decolorized, and the decolorized yarn is obtained.
The washing requirements of the process and the traditional process of the invention are as follows: and washing the decolorized yarns for about 10 minutes by using 10-20 times of clear water by weight.
The results of the comparison of the present invention with conventional soaking bleaching results are shown in the following table:
as can be seen from the above table:
1. the stripping time of the yarn can be effectively shortened by adopting the sodium hypochlorite aqueous solution with the concentration of more than 200 g/L;
2. compared with the traditional soaking bleaching process, the total time (namely fading time) of soaking and hanging in the process is greatly shorter than that of the traditional process, and the strength reduction rate before and after treatment is equivalent to that of the traditional process.
Example 2
The processing object is as follows: dyeing an all-cotton woven fabric by using a reactive dye, wherein the gram weight is as follows: 122 g/m2。
Sodium hypochlorite aqueous solution for treatment: the concentrations were 100g/L, 200g/L, 300 g/L, and 400g/L, respectively.
Bath ratio of yarn to sodium hypochlorite aqueous solution at the time of impregnation: 1: 15.
Temperature of impregnation and suspension: and (4) room temperature.
The process of the invention comprises the following steps: and (3) soaking the dyed fabric in a sodium hypochlorite aqueous solution, suspending the dyed fabric in a normal temperature environment, and washing the dyed fabric with clear water after the fabric is faded to obtain the decolored fabric.
The traditional soaking bleaching process comprises the following steps: the dyed fabric was immersed in an aqueous sodium hypochlorite solution until completely decolorized, to obtain a decolorized fabric.
The washing requirements of the process and the traditional process of the invention are as follows: and washing the decolored fabric for about 10 minutes by using clear water with the weight being 10-20 times that of the decolored fabric.
The results of the comparison of the present invention with conventional soaking bleaching results are shown in the following table:
as can be seen from the above table:
1. the stripping time of the fabric can be effectively shortened by adopting the sodium hypochlorite aqueous solution with the concentration of more than 200 g/L;
2. compared with the traditional soaking bleaching process, the total time (namely fading time) of soaking and hanging in the process is greatly shorter than that of the traditional process, and the strength reduction rate before and after treatment is greatly shorter than that of the traditional process.
Claims (4)
1. The efficient color stripping method for waste cotton textiles is characterized in that the waste cotton textiles are soaked in a sodium hypochlorite aqueous solution, hung in a normal-temperature environment, washed by clean water after the waste cotton textiles are faded, and the decolored waste cotton textiles are obtained.
2. The efficient stripping method for the waste cotton textiles according to claim 1, wherein the concentration of the sodium hypochlorite aqueous solution is 200-400 g/L.
3. The efficient stripping method for the waste cotton textiles according to claim 1 is characterized in that the dipping time is 3-5 minutes.
4. The efficient stripping method for the waste cotton textiles according to claim 1 is characterized in that the hanging time is 9-16 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149516.1A CN110804855A (en) | 2019-11-21 | 2019-11-21 | Efficient stripping method for waste cotton textiles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149516.1A CN110804855A (en) | 2019-11-21 | 2019-11-21 | Efficient stripping method for waste cotton textiles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110804855A true CN110804855A (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911149516.1A Pending CN110804855A (en) | 2019-11-21 | 2019-11-21 | Efficient stripping method for waste cotton textiles |
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| Country | Link |
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| CN (1) | CN110804855A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113073462A (en) * | 2021-03-30 | 2021-07-06 | 广东溢达纺织有限公司 | Method for stripping fabric |
| CN115287888A (en) * | 2021-12-24 | 2022-11-04 | 青岛大学 | Reduction-oxidation two-stage decoloring method suitable for dyeing waste cotton fabrics by reactive dyes |
Citations (7)
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|---|---|---|---|---|
| CN102433787A (en) * | 2011-10-09 | 2012-05-02 | 熊荣洪 | Two-step color-stripping and bleaching technology of regenerated cotton fiber |
| CN102535206A (en) * | 2012-01-06 | 2012-07-04 | 绍兴文理学院 | Stripping method for dyed fabric made of pure cotton |
| CN104343024A (en) * | 2014-10-29 | 2015-02-11 | 合肥新桥制衣有限公司 | Dyeing treatment method of cotton cloth |
| CN104499266A (en) * | 2014-12-15 | 2015-04-08 | 民勤县家兴节能服务有限公司 | Pretreatment method of waste cotton clothes |
| CN104931322A (en) * | 2015-07-01 | 2015-09-23 | 必维申优质量技术服务江苏有限公司 | Quantitative analysis method for cotton and viscose blended fabrics |
| CN108625076A (en) * | 2018-03-26 | 2018-10-09 | 安徽回车服装有限公司 | A kind of textile decoloration process |
| CN109667134A (en) * | 2017-10-14 | 2019-04-23 | 余姚市荣欣毛麻制品厂 | A kind of weaving refuse yarn recycling becomes the regeneration technology of fiber-spinnable |
-
2019
- 2019-11-21 CN CN201911149516.1A patent/CN110804855A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433787A (en) * | 2011-10-09 | 2012-05-02 | 熊荣洪 | Two-step color-stripping and bleaching technology of regenerated cotton fiber |
| CN102535206A (en) * | 2012-01-06 | 2012-07-04 | 绍兴文理学院 | Stripping method for dyed fabric made of pure cotton |
| CN104343024A (en) * | 2014-10-29 | 2015-02-11 | 合肥新桥制衣有限公司 | Dyeing treatment method of cotton cloth |
| CN104499266A (en) * | 2014-12-15 | 2015-04-08 | 民勤县家兴节能服务有限公司 | Pretreatment method of waste cotton clothes |
| CN104931322A (en) * | 2015-07-01 | 2015-09-23 | 必维申优质量技术服务江苏有限公司 | Quantitative analysis method for cotton and viscose blended fabrics |
| CN109667134A (en) * | 2017-10-14 | 2019-04-23 | 余姚市荣欣毛麻制品厂 | A kind of weaving refuse yarn recycling becomes the regeneration technology of fiber-spinnable |
| CN108625076A (en) * | 2018-03-26 | 2018-10-09 | 安徽回车服装有限公司 | A kind of textile decoloration process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113073462A (en) * | 2021-03-30 | 2021-07-06 | 广东溢达纺织有限公司 | Method for stripping fabric |
| CN115287888A (en) * | 2021-12-24 | 2022-11-04 | 青岛大学 | Reduction-oxidation two-stage decoloring method suitable for dyeing waste cotton fabrics by reactive dyes |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200218 |
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| WD01 | Invention patent application deemed withdrawn after publication |