CN111411506A - Stripping process for waste jean fabric pieces - Google Patents
Stripping process for waste jean fabric pieces Download PDFInfo
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- CN111411506A CN111411506A CN201911216776.6A CN201911216776A CN111411506A CN 111411506 A CN111411506 A CN 111411506A CN 201911216776 A CN201911216776 A CN 201911216776A CN 111411506 A CN111411506 A CN 111411506A
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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
- D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
- D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
- D06L1/14—De-sizing
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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
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/13—Fugitive dyeing or stripping dyes
- D06P5/137—Fugitive dyeing or stripping dyes with other compounds
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Abstract
The invention relates to a stripping process for waste jean fabric scraps, which comprises the following steps of desizing, adding sodium chlorite and a penetrating agent, adding glacial acetic acid to adjust the pH value to 4.0, heating to 60-80 ℃ and keeping the temperature for 30-45 minutes, stripping, adding trisodium phosphate, sodium chlorite and the penetrating agent, adding organic acid to adjust the pH value to 4.0, soaking for 0.5 hour at room temperature, then heating at the speed of 1 ℃ per minute for 30 minutes, directly heating to 95 ℃ after uniform heating and keeping the temperature for 60 minutes, bleaching, adding sodium hypochlorite to adjust the pH value to 9-11, soaking for 40-80 minutes at room temperature, dechlorinating, adding hydrogen peroxide, starting a circulating pump, heating to 50-60 ℃, keeping the temperature for 30-50 minutes, and finally cleaning with hot water at the temperature of 80-90 ℃. The process has low cost, short color stripping time and less material consumption, and can meet the requirement of industrial production.
Description
Technical Field
The invention belongs to the technical field of waste textile fabric recovery, and particularly relates to a stripping process for waste jean fabric scraps.
Background
The stripping process for crushing waste jeans comprises three core procedures: desizing, stripping and bleaching. Through a series of treatments, the waste jeans with different colors are crushed into white jeans with certain whiteness and basically consistent whiteness. The white cloth is processed through the procedures of opening, scutching, carding and the like to produce white regenerated cotton with wide application, the regeneration industry of China is basically a cold bleaching process in a workshop way at present, high-concentration sodium chlorite or sodium hypochlorite is used for soaking for a long time of 12-18 hours, part of enterprises are trying a thermal decoloring process, most of the processes are not mature, meanwhile, amylase is mostly adopted as a desizing agent on the market, sodium sulfite and soda are used for dechlorination, the cost is high, and the degree of industrial production cannot be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the stripping process for the waste jean shreds, which can complete the stripping of the waste jean shreds at a lower cost, has good desizing effect, uniform decolorization and short decolorization time, and can meet the requirements of industrial production.
In order to achieve the purpose, the technical scheme of the invention comprises the following steps:
desizing: adding smashed denim into a dye vat, firstly adding sodium chlorite with the weight of 0.5-1% of the smashed weight of the denim, then adding penetrating agent with the weight of 0.2-0.5% of the smashed weight of the denim and a certain amount of water, adding glacial acetic acid to adjust the pH value to 4.0, heating to 60-80 ℃, keeping for 30-60 minutes, and finally cleaning with hot water with the temperature of 80-90 ℃;
stripping: sequentially and respectively adding trisodium phosphate with the weight of 0.5-1% of the crushed denim before the desizing step and sodium chlorite with the concentration of 80%, wherein the weight of the added sodium chlorite is 2-3% of the crushed denim before the desizing step, then adding penetrant with the weight of 0.2-0.5% of the crushed denim before the desizing step, adding water to enable the bath ratio to reach 1:5-1:6, adding organic acid to adjust the pH value to 3.8-4.5, soaking at room temperature for 0.5 hour, then heating at the speed of 1 ℃ per minute for 30 minutes, directly heating to 95 ℃ after uniform heating is finished and keeping for 60 minutes, collecting residual night after stripping is finished, sealing for later use, and finally cleaning with hot water with the temperature of 80-90 ℃;
bleaching: adding sodium hypochlorite which is 3-5% of the denim weight before the desizing step, adjusting the pH value to 9-10.5, adding water to enable the bath ratio to reach 1:5-1:6, soaking for 40-80 minutes at room temperature, and finally cleaning with hot water at 80-90 ℃;
dechlorination: adding hydrogen peroxide with the weight of 1-1.5% of the crushed denim before the desizing step, adding water to enable the bath ratio to reach 1:5-1:6, heating to 50-60 ℃, preserving heat for 30-50 minutes, and finally cleaning with hot water with the temperature of 80-90 ℃.
Preferably, before said desizing step, the denim pieces are sorted, sorted and washed.
Preferably, after the dechlorination step, the dechlorination step is further carried out by cleaning, drying, opening, carding and impurity removal.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the cost is low. In the desizing step, expensive amylase is not adopted as a desizing agent, sodium chlorite and a penetrating agent are used instead, glacial acetic acid is added to adjust the pH value so as to achieve the desizing effect, and meanwhile, the used sodium chlorite waste liquid in the stripping process is collected and applied to the desizing step of the next process, so that the cost is further saved;
2. the desizing effect is good, and the decoloration is uniform. In the dechlorination step, hydrogen peroxide is used for dechlorination, so that the bleaching effect is more obvious, and the whiteness of the fiber is more uniform;
3. the decoloring time is short, and the used materials are few. The process adds trisodium phosphate in the stripping process, adopts a special heating mode, greatly shortens the time used in the stripping process, can finish the stripping step only by using 2-3 hours compared with the prior art that the sodium hypochlorite and sodium chlorite are soaked for 12-18 hours at room temperature, and simultaneously has low requirements on the concentration of the sodium hypochlorite and the sodium chlorite due to the special heating mode adopted by the process, thereby reducing the cost consumption.
Detailed Description
The basic process flow of the embodiment of the invention is as follows: selecting sorted raw materials → washing → desizing → washing → stripping → bleaching → dechlorination → washing → drying → opening → carding → removing impurities → becoming spinnable fiber.
Desizing: firstly, jean is crushed, collected, sorted and then added into a dye vat, wherein the dye vat refers to various devices used by a printing and dyeing mill, such as a common cloth boiling pot, a high-temperature high-pressure dyeing machine, a loose fiber dyeing machine and the like. Sodium chlorite in 0.5-1 wt% of jean, penetrant in 0.2-0.5 wt% of jean and water are added, and the penetrant (JFC) is fatty alcohol-polyoxyethylene ether, has fixed hydrophilic and lipophilic groups, is oriented in the surface of solution and can lower the surface tension obviously, and is non-ionic surfactant. Adding glacial acetic acid to adjust the pH to 4.0, wherein other regulators such as acetic acid and the like can be used for adjustment, starting a circulating pump, heating to 60-80 ℃, keeping the temperature for 30-45 minutes, and finally cleaning with hot water at 80-90 ℃, so that starch slurry and chemical slurry which are difficult to remove in the slurry can be fully decomposed and dissolved in sodium chlorite in an acidic environment;
stripping: adding trisodium phosphate 0.5-1% of the denim crushed weight and sodium chlorite 2-3% of the denim crushed weight, wherein the concentration of the added sodium chlorite is 80%, the trisodium phosphate is mainly used as a stabilizing agent and a pH buffering agent at the place to ensure that the stripping process is maintained in a stable pH value range, and adding a penetrating agent and water 0.2-0.5% of the denim crushed weight to ensure that the bath ratio reaches 1:5-1:6, and the bath ratio is the printing and dyeing terminology, namely the ratio of the weight of the fabric to the volume of the treatment solution. For example, a bath ratio of 1:10 means that 1 ton of fiber is treated with 10 tons of aqueous solution. Adding organic acid to adjust pH to 3.8-4.5, wherein the organic acid comprises acetic acid, glycolic acid, oxalic acid, etc. Starting a circulating pump, soaking for 0.5 hour at room temperature, then heating for 30 minutes at the speed of heating to 1 ℃ per minute, directly heating to 95 ℃ after uniform heating is completed, keeping for 60 minutes, collecting the residual liquid after color stripping is completed, sealing for later use, desizing in the next cylinder, and finally cleaning with hot water at the temperature of 80-90 ℃.
Bleaching: the sodium hypochlorite which accounts for 3 to 5 percent of the weight of the denim pieces is added, the concentration of the added sodium hypochlorite is 15 percent, the preparation of the sodium hypochlorite is simple, the cost is low, the operation is convenient, the equipment is simple, the fiber bleaching agent is a fiber bleaching agent which is widely used at present, and the bleaching agent has a bleaching effect on natural pigments and dye pigments on fibers. Adjusting pH to 9-10.5, adding water to make bath ratio reach 1:5-1:6, starting circulating pump, soaking at room temperature for 40-80 min, and cleaning with 80-90 deg.C hot water;
dechlorination: adding hydrogen peroxide and water which are 1-1.5% of the weight of the jean fabric pieces, enabling the bath ratio to reach 1:5-1:6, starting a circulating pump, heating to 50-60 ℃, keeping the temperature for 30-50 minutes, finally cleaning with hot water at 80-90 ℃, dechlorinating by using hydrogen peroxide, not only having the further bleaching effect, but also enabling the whiteness of the waste jean fabric pieces to be more uniform, simultaneously dechlorinating thoroughly, and volatilizing by self after dechlorinating by using the hydrogen peroxide, so that no pungent smell is left.
And (3) crushing, cleaning, drying, opening, carding and removing impurities from the dechlorinated waste denim to obtain the spinnable fiber.
The present invention will be further described in detail with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the present invention is not limited to the following examples.
Example 1
A stripping process for waste jean fabric scraps comprises the following steps:
desizing: adding sodium chlorite with the weight of 0.5 percent of the crushed weight of the jean and a penetrating agent with the weight of 0.5 percent of the crushed weight of the jean into a dye vat, adding glacial acetic acid to adjust the pH value to 4.0, heating to 70 ℃, keeping for 50 minutes, and cleaning with hot water with the temperature of 90 ℃;
stripping: adding trisodium phosphate 0.5% of the crushed weight of the denim before the desizing step, adding sodium chlorite 2% of the crushed weight of the denim before the desizing step, adding penetrant 0.5% of the crushed weight of the denim before the desizing step, adding water to enable the bath ratio to reach 1:5, adjusting the pH value to 3.8, soaking for 0.5 hour at room temperature, then heating for 30 minutes at the speed of 1 ℃ per minute, directly heating to 95 ℃ after uniform heating is finished, keeping the temperature for 60 minutes, and cleaning with hot water at 90 ℃;
bleaching: adding sodium hypochlorite which is 3 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10.5, adding water to enable the bath ratio to reach 1:5, soaking for 40 minutes at room temperature, and cleaning with hot water at 90 ℃;
dechlorination: adding hydrogen peroxide in an amount which is 1 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 50 ℃, keeping the temperature for 50 minutes, cleaning with hot water at 90 ℃, cleaning, drying, opening, carding and removing impurities from the dechlorinated denim pieces to obtain the spinnable fiber.
Example 2
The difference from the example 1 is only in the selection of the process parameters, and the others are not changed, which are specifically as follows:
in the desizing step, sodium chlorite with the weight of 0.6 percent of the crushed weight of the denim and penetrant with the weight of 0.4 percent of the crushed weight of the denim are added, glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 65 ℃, the mixture is kept for 45 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, trisodium phosphate with the weight of 0.6 percent of the crushed weight of the denim before the desizing step is added, sodium chlorite with the weight of 2.2 percent of the crushed weight of the denim before the desizing step is added, penetrant with the weight of 0.4 percent of the crushed weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ after the uniform heating is completed and is kept for 60 minutes, and the denim;
in the bleaching step, adding sodium hypochlorite which is 3.5 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10, adding water to enable the bath ratio to reach 1:5, soaking for 50 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide which is 1.1 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 50 ℃, keeping the temperature for 45 minutes, cleaning with hot water at 90 ℃, cleaning the dechlorinated denim pieces, drying, opening, carding and removing impurities to obtain the spinnable fiber.
Example 3
The difference from the embodiments 1 and 2 is only in the selection of the process parameters, and other changes are not changed, specifically as follows:
in the desizing step, sodium chlorite with the weight of 0.7 percent of the crushed weight of the denim and penetrant with the weight of 0.4 percent of the crushed weight of the denim are added, glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 80 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, trisodium phosphate with the weight of 0.7 percent of the crushed weight of the denim before the desizing step is added, sodium chlorite with the weight of 2.5 percent of the crushed weight of the denim before the desizing step is added, penetrant with the weight of 0.3 percent of the crushed weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ after the uniform heating is finished and is kept for 60 minutes, and the denim;
in the bleaching step, adding sodium hypochlorite which is 4.0 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide which is 1.2 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 55 ℃, keeping the temperature for 40 minutes, cleaning with hot water at 90 ℃, cleaning, drying, opening, carding and removing impurities from the dechlorinated denim pieces to obtain the spinnable fiber.
Example 4
The difference from the examples 1, 2 and 3 is only in the selection of the process parameters, and other changes are not carried out, specifically as follows: in the desizing step, sodium chlorite with the weight of 0.8 percent of the crushed weight of the denim and penetrant with the weight of 0.3 percent of the crushed weight of the denim are added, glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 70 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, trisodium phosphate with the weight of 0.8 percent of the crushed weight of the denim before the desizing step is added, sodium chlorite with the weight of 2.8 percent of the crushed weight of the denim before the desizing step is added, penetrant with the weight of 0.4 percent of the crushed weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ after the uniform heating is completed and is kept for 60 minutes, and the denim;
in the bleaching step, adding sodium hypochlorite which is 3.5 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 9.5, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1.3 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 55 ℃, keeping the temperature for 40 minutes, cleaning with hot water at 90 ℃, cleaning, drying, opening, carding and removing impurities from the dechlorinated denim pieces to obtain the spinnable fiber.
Example 5
The differences from the examples 1, 2, 3 and 4 are only in the selection of the process parameters, and the others are not changed, and the specific steps are as follows:
in the desizing step, sodium chlorite with the weight of 1 percent of the crushed weight of the denim and penetrant with the weight of 0.2 percent of the crushed weight of the denim are added, glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 65 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, trisodium phosphate with the weight of 1 percent of the broken weight of the denim before the desizing step is added, sodium chlorite with the weight of 3 percent of the broken weight of the denim before the desizing step is added, penetrant with the weight of 0.2 percent of the broken weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ after the uniform heating is completed and is kept for 60 minutes, and the denim;
in the bleaching step, adding sodium hypochlorite which is 4 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 9.5, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide which is 1.5 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 60 ℃, keeping the temperature for 30 minutes, cleaning with hot water at 90 ℃, cleaning the dechlorinated denim pieces, drying, opening, carding and removing impurities to obtain the spinnable fiber.
Compared with the prior art, the invention has the advantages of low cost, good desizing effect and uniform decolorization, and the process adds trisodium phosphate in the stripping process and adopts a special heating mode, thereby greatly shortening the time used in the stripping procedure, and compared with the prior art, the process can finish the stripping step only by soaking for 2-3 hours at room temperature for 12-18 hours. Meanwhile, the special heating mode adopted by the process has low requirements on the concentration of sodium hypochlorite and sodium chlorite, so that the cost and the consumption are reduced, and the requirements of industrial production can be met.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A stripping process for waste jean fabric scraps is characterized by comprising the following steps:
desizing: adding smashed denim into a dye vat, firstly adding sodium chlorite with the weight of 0.5-1% of the smashed weight of the denim, then adding penetrating agent with the weight of 0.2-0.5% of the smashed weight of the denim and a certain amount of water, adding glacial acetic acid to adjust the pH value to 4.0, heating to 60-80 ℃, keeping for 30-60 minutes, and finally cleaning with hot water with the temperature of 80-90 ℃;
stripping: sequentially and respectively adding trisodium phosphate with the weight of 0.5-1% of the crushed denim before the desizing step and sodium chlorite with the concentration of 80%, wherein the weight of the added sodium chlorite is 2-3% of the crushed denim before the desizing step, then adding penetrant with the weight of 0.2-0.5% of the crushed denim before the desizing step, adding water to enable the bath ratio to reach 1:5-1:6, adding organic acid to adjust the pH value to 3.8-4.5, soaking at room temperature for 0.5 hour, then heating at the speed of 1 ℃ per minute for 30 minutes, directly heating to 95 ℃ after uniform heating is finished and keeping for 60 minutes, collecting residual night after stripping is finished, sealing for later use, and finally cleaning with hot water with the temperature of 80-90 ℃;
bleaching: adding sodium hypochlorite which is 3-5% of the denim weight before the desizing step, adjusting the pH value to 9-10.5, adding water to enable the bath ratio to reach 1:5-1:6, soaking for 40-80 minutes at room temperature, and finally cleaning with hot water at 80-90 ℃;
dechlorination: adding hydrogen peroxide with the weight of 1-1.5% of the crushed denim before the desizing step, adding water to enable the bath ratio to reach 1:5-1:6, heating to 50-60 ℃, preserving heat for 30-50 minutes, and finally cleaning with hot water with the temperature of 80-90 ℃.
2. The stripping process according to claim 1, characterized in that: in the desizing step, the sodium chlorite with the weight of 0.5 percent of the crushed weight of the denim and the penetrating agent with the weight of 0.5 percent of the crushed weight of the denim are added, the glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 70 ℃, the mixture is kept for 50 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, the trisodium phosphate with the weight of 0.5 percent of the crushed weight of the denim before the desizing step is added, the sodium chlorite with the weight of 2 percent of the crushed weight of the denim before the desizing step is added, the penetrant with the weight of 0.5 percent of the crushed weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 3.8, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ and kept for 60 minutes after the uniform heating is finished, and the denim is cleaned;
in the bleaching step, adding sodium hypochlorite accounting for 3 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10.5, adding water to enable the bath ratio to reach 1:5, soaking for 40 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1 percent of the crushed weight of the denim before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 50 ℃, keeping the temperature for 50 minutes, and cleaning with hot water at 90 ℃.
3. The stripping process according to claim 1, characterized in that: the stripping process according to claim 1, characterized in that: in the desizing step, the sodium chlorite with the weight of 0.6 percent of the crushed weight of the denim and the penetrating agent with the weight of 0.4 percent of the crushed weight of the denim are added, the glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 65 ℃, the mixture is kept for 45 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, the trisodium phosphate with the weight of 0.6 percent of the broken weight of the denim before the desizing step is added, the sodium chlorite with the weight of 2.2 percent of the broken weight of the denim before the desizing step is added, the penetrant with the weight of 0.4 percent of the broken weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ and kept for 60 minutes after the uniform heating is finished, and the denim is cleaned;
in the bleaching step, adding sodium hypochlorite accounting for 3.5 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10, adding water to enable the bath ratio to reach 1:5, soaking for 50 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1.1 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 50 ℃, keeping the temperature for 45 minutes, and cleaning with hot water at 90 ℃.
4. The stripping process according to claim 1, characterized in that: the stripping process according to claim 1, characterized in that: in the desizing step, the sodium chlorite with the weight of 0.7 percent of the crushed weight of the denim and the penetrating agent with the weight of 0.4 percent of the crushed weight of the denim are added, the glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 80 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, the trisodium phosphate with the weight of 0.7 percent of the broken weight of the denim before the desizing step is added, the sodium chlorite with the weight of 2.5 percent of the broken weight of the denim before the desizing step is added, the penetrant with the weight of 0.3 percent of the broken weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ and kept for 60 minutes after the uniform heating is finished, and the denim is cleaned;
in the bleaching step, adding sodium hypochlorite which is 4.0 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 10, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1.2 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 55 ℃, preserving the heat for 40 minutes, and cleaning with hot water at 90 ℃.
5. The stripping process according to claim 1, characterized in that: the stripping process according to claim 1, characterized in that: in the desizing step, the sodium chlorite with the weight of 0.8 percent of the crushed weight of the denim and the penetrating agent with the weight of 0.3 percent of the crushed weight of the denim are added, the glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 70 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, the trisodium phosphate with the weight of 0.8 percent of the broken weight of the denim before the desizing step is added, the sodium chlorite with the weight of 2.8 percent of the broken weight of the denim before the desizing step is added, the penetrant with the weight of 0.4 percent of the broken weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ and kept for 60 minutes after the uniform heating is finished, and the denim is cleaned;
in the bleaching step, adding sodium hypochlorite accounting for 3.5 percent of the crushed weight of the denim before the desizing step, adjusting the pH value to 9.5, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1.3 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 55 ℃, preserving the heat for 40 minutes, and cleaning with hot water at 90 ℃.
6. The stripping process according to claim 1, characterized in that: the stripping process according to claim 1, characterized in that: in the desizing step, the sodium chlorite with the weight of 1 percent of the crushed weight of the denim and the penetrating agent with the weight of 0.2 percent of the crushed weight of the denim are added, the glacial acetic acid is added to adjust the pH value to 4.0, the temperature is raised to 65 ℃, the mixture is kept for 40 minutes, and the mixture is cleaned by hot water with the temperature of 90 ℃;
in the stripping step, the trisodium phosphate with the weight of 1 percent of the broken weight of the denim before the desizing step is added, the sodium chlorite with the weight of 3 percent of the broken weight of the denim before the desizing step is added, the penetrant with the weight of 0.2 percent of the broken weight of the denim before the desizing step is added, water is added to enable the bath ratio to reach 1:5, the pH value is adjusted to 4.0, the denim is soaked for 0.5 hour at room temperature, then the denim is heated for 30 minutes at the speed of 1 ℃ per minute, the denim is directly heated to 95 ℃ after the uniform heating is finished and is kept for 60 minutes, and the denim is;
in the bleaching step, adding sodium hypochlorite accounting for 4% of the crushed weight of the denim before the desizing step, adjusting the pH value to 9.5, adding water to enable the bath ratio to reach 1:5, soaking for 60 minutes at room temperature, and cleaning with hot water at 90 ℃;
in the dechlorination step, adding hydrogen peroxide accounting for 1.5 percent of the weight of the denim pieces before the desizing step, adding water to enable the bath ratio to reach 1:5, heating to 60 ℃, preserving heat for 30 minutes, and cleaning with hot water at 90 ℃.
7. The stripping process according to claim 1, characterized in that: before the desizing step, the denim pieces are selected, classified and washed.
8. The stripping process according to claim 1, characterized in that: and after the dechlorination step, cleaning, drying, opening, carding and impurity removal are also carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911216776.6A CN111411506A (en) | 2019-12-03 | 2019-12-03 | Stripping process for waste jean fabric pieces |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911216776.6A CN111411506A (en) | 2019-12-03 | 2019-12-03 | Stripping process for waste jean fabric pieces |
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| Publication Number | Publication Date |
|---|---|
| CN111411506A true CN111411506A (en) | 2020-07-14 |
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|---|---|---|---|
| CN201911216776.6A Pending CN111411506A (en) | 2019-12-03 | 2019-12-03 | Stripping process for waste jean fabric pieces |
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| Country | Link |
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| CN (1) | CN111411506A (en) |
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2019
- 2019-12-03 CN CN201911216776.6A patent/CN111411506A/en active Pending
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