Complete dyeing plant stripping method summary-Iota

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News > Dynamic industry > Complete dyeing plant stripping method summary

Complete dyeing plant stripping method summary

Dyeing and finishing of various fabrics stripping method
1. Stripping principle
Stripping is the use of chemical action, the dye on the fiber damage, so that loss of color.
Chemical stripping agent there are two categories:
One is reducing stripping agents, it is by destroying the molecular structure of hair dye color system to achieve fade or achromatic purposes, such as azo dyes structure, the azo group may be reduced to an amino group and lose color. However, reducing the damage to dye hair color system some structure is reversible, and thus its bleaching can be restored, such as hair color system anthraquinone structure is. Hydrosulfite, Rongalite is commonly used reducing stripping agent.
The other is oxidative stripping agents, the most commonly used is hydrogen peroxide and sodium hypochlorite. Oxidizer under certain conditions can cause certain components of the dye molecule groups chromogenic system damage, such as azo-based decomposition, oxidation amino, hydroxy methylation, complex metal ions detachment. These structural changes are not reversible, resulting in discoloration or achromatic dye, thus theoretically oxidative stripping agent can be used for completely stripping process. Anthraquinone dye structures using this method, the effect is a plus.

2. Stripping common dye

2.1 reactive dyes stripping

Any metal-complex dyes, you should first polyvalent metal chelating agent solution (2 g / l EDTA) in boiling. Then reduced or oxidized thoroughly washed before peeling color processing in alkaline. Complete stripping usually high temperature treatment in alkali and hydrosulfite in 30 minutes. After stripping the reduction, adequate cleaning. Then after a cold solution of sodium hypochlorite bleach.

Process Example:

Continuous stripping process examples:

→ padding dyed cloth defect reduction solution (caustic soda 20 g / l, sodium hydrosulfite 3O g / l) → 703 reduction steamer steaming (100 ℃) → washing → drying

Vat stripping process examples:

Color defect cloth → Reel → 2 → caustic soda water 2 (20 g / l) → stripping 8 (hydrosulfite 15 g / l, 60 ℃) cold water 4 → 2 → General hypochlorite level track drift volume Process (NaClO2.5 g / liter, stacking 45 minutes).

2.2 sulfur stripping color

Fixed sulfur dyed fabrics, usually reducing them in the blank solution (6 g / l of sodium sulfide full intensity), and at the highest possible temperature treatment, before re-staining Chak reach dyed moiety peel color. Severe cases, shall be sodium hypochlorite or sodium hydrosulfite.

Process Example:

Light Example:

→ more dip a cloth feed roll (5 to 6 grams of sodium hypochlorite liter, 50 ℃) → 703 Steamer (2 min) → → drying thoroughly rinsed with water.

Dark Examples:

Color defect cloth → rolling oxalic acid (15 g / l 40 ℃) → drying → rolling sodium hypochlorite (6 g / l, 30 ℃ l5 seconds) → thoroughly rinsed with water and drying

Batch process Example:

55% crystalline sodium sulfide: 5-10 g / l; soda ash: 2-5 g / liter (or 36 ° BéNaOH2-5 ml / l);

80-100 temperature, time 15-30, bath ratio 1: 30-40.

Stripping 2.3 Acid Dyes

With ammonia (2O to 30 g / l), and anionic wetting agent (1-2 g / l), boiled for 30-45 minutes. Before ammonia treatment with sodium hydrosulfite (10-20 g / l) at 70 ℃ treatment, help complete stripping. Finally, we can use oxidation stripping method.

Under acidic conditions, the addition of special surfactants also have a good stripping effect. There is also a basic condition of stripping.

Process Example:

Real Silk stripping process examples:

Restore stripping bleach (sodium carbonate 1g / L, peregal O2g / L, hydrosulfite 2-3g / L, temperature 60 ℃, time 30-45min, bath ratio 1:30) → pre-media processing (10g ferrous sulfate heptahydrate / L, 50% hypophosphorous acid 2g / L, formic acid adjusted pH3-3.5,80 ℃ kept 60min) → rinse (80 ℃ cleaning 20min) → bleaching stripping oxide (35% hydrogen peroxide 10mL / L, sodium 3 five crystal water -5g / L, temperature 70-8O ℃, time 45-90min, pH value 8-1O) → cleaning

Wool stripping process examples:

Nepal where D AN: 4; Oxalic acid: 2%; in 30 minutes raised to boiling, and held at boiling point for 20-30 minutes; then cleaned.

Nylon stripping process examples:

36 ° BéNaOH: 1% -3%; Peregal O: 15% -20%; synthetic detergent: 5% -8%; bath ratio: 1: 25-1: 30; Temperature: 98-100 ℃; time: 20-30min (to all bleaching far).

All gradually cooling after stripping thoroughly rinsed with water to clean, and then 0.5mL / L acetic acid, 30 ℃, 10min fully neutralize the residual alkali on nylon, then rinse.

2.4 vat dyes stripping

Typically sodium hydroxide and sodium hydrosulfite mixed system, at a relatively high temperature, and then restore the fabric dye. Sometimes polyvinylpyrrolidone solution to be added, such as BASF's AlbigenA.

Continuous stripping process examples:

→ padding dyed cloth defect reduction solution (caustic soda 20 g / l, sodium hydrosulfite 3O g / l) → 703 reduction steamer steaming (100 ℃) → washing → drying

Batch stripping process examples:

Peregal O: 2-4 g / l; 36 ° BéNaOH: 12-15 ml / liter; hydrosulfite: 5-6 g / l;

Stripping the treatment temperature is 70-80 ℃, time is 30-60 minutes, liquor ratio is 1: 30-40.

2.5 disperse stripping

Conducted disperse in polyester stripping usually uses the following methods:

Method One: sodium formaldehyde sulfoxylate (Rongalite) and a carrier, at 100 ℃ and pH4-5 treatment; at 130 ℃ when the treatment effect is more pronounced.

Method two: sodium chlorite and formic acid at 100 ℃ and pH3.5 process to complete.

The best result is achieved by a method of treatment, followed by two processing methods. After treatment Overdyeing black as possible.

2.6 cationic dye stripping

Conducted disperse in polyester stripping usually uses the following methods:

Containing 5 ml / l monoethanolamine and 5 g / l sodium chloride bath, and treated at the boiling point for one hour. Then cleaned, and then containing 5 ml / liter of sodium hypochlorite (150 g / l available chlorine), 5 g / l of sodium nitrate (corrosion inhibitor), and adjust the PH value of 4 to 4.5 with acid to the bleaching bath 30 min. Finally, the fabric is chlorine, sodium sulfite (3 g / l) at 60 ℃ 15 minutes, or 1.5 g / l of sodium hydrosulfite treatment at 85 ℃ 20 to 30 minutes. And finally cleaned.

Use detergent (0.5 to 1 g / liter) and boiling solution of acetic acid, treated dyed fabric l-2 hours at pH4 can be achieved partial stripping effect.

Process Example:

See 5.1 acrylic knit looking to spend processing example.

2.7 insoluble azo dye stripping

5 to l0 ml / l 38 ° Bé caustic soda, l to 2 ml / liter thermal stability dispersants, and 3-5 g / liter hydrosulfite treatment, plus 0.5 to l g / l anthraquinone powder. If there is sufficient insurance powder and soda, anthraquinone make stripping liquid red. If it is converted to yellow or brown, we must further addition of caustic soda or sodium hydrosulfite. After stripping the fabric should be fully cleaned.

2.8 Paint stripping

Paint peeling difficult, it is generally used potassium permanganate to be stripped light.

Process Example:

Dyeing cloth defect → rolling potassium permanganate (18 g / l) → washing → roll oxalic acid (20 g / l, 40 ℃) → washing → drying.

3. Stripping finishing agent used

Stripping 3.1 Fixing Agent

Fixing agent Y using a small soda and peregal O be stripped; polyamine cationic fixative acetic acid boiling method to be stripped is available.

3.2 silicone and softener strip

Usually softener available detergent removal method, sometimes with soda plus detergent method; some softener shall be added formic acid surfactant removal method. The method and process conditions to remove the subject sample test.

Silicone difficult to remove, but with a special surfactant, under strong alkaline conditions, using boiling method removes most of the silicone oil. Of course, these are subject to sample testing.

Stripping 3.3 Resin finishing agent

Resin finishing agent commonly used rolling acid steam cleaning method of removing its typical process is: Padding acid (hydrochloric acid concentration of 1.6 g / liter) → stacked (85 ℃ 10 min) → hot water washing → cold water washing → drying dry. Strippable resin on the fabric used in this process in a continuous bleaching machine on flat track.

4. Shade correction principle and technology

4.1 Principles and shade correction technology

When the dyed fabric shade does not meet the requirements, the need to be amended. Principle color shade correction is over principle. The so-called complementary color, two colors namely mutual reduction features. Several mutually complementary color to color: red and one green, one blue and orange, yellow and one purple. Example, if the red too, you can add a small amount of green paint to cut. But color is only used to trace more than adjust the shade, if the amount is too large, it will affect the color depth and vividness, the general amount of lg / L or so.

In general, the reactive dyeing fabrics difficult refurbished, refurbished convenient vat dyes dyed fabric; shade difficult to control when sulfur refurbished, usually with vat dyes subtraction color; direct dyes can be used to add color refurbished, but the amount should be less than 1g / L.

Shade correcting commonly used methods are washed with water (for dyeing finished fabric shade slightly darker, more floating and washing, soaping cloth refurbished suboptimal repair color), light peel (refer dye stripping process, conditions stripping process than normal light), rolling base steam cleaning (for base-sensitive dye, mostly for reactive dyes; as with Reactive Black KNB mixed colors of dyed cloth as bluish shade, you can by rolling the right amount of caustic soda , supplemented by steam-washing method to achieve the purpose of the blue light change), rolling whitener (for red dyeing finished fabric, especially for reducing dye dyed finished fabric, color is in, when more light effective normal wilt dark shade drift can be considered complex, but should be based on hydrogen peroxide-based bleaching can avoid unnecessary discoloration.), paint color printing and so on.

4.2 Shade Correction Process Example: reactive dyes subtractive method

4.2.1 In the first five grid reducing soaping machine-washing tank, each with 1g / L peregal O boiled, after-washing, generally shallow 15%.

4.2.2 In the first five grid reducing soaping machine-washing tank, each with lg / L peregal O, 1mL / L of glacial acetic acid, at room temperature over the machine, make about 10% of orange light.

4.2.3 immersed in a reducing machine rolling groove 0.6mL / L bleaching water, at room temperature over the steam box, the first two grid wash tank does not turn on the water, cold water after two grid, a grid hot water, then soap making, can shallow 2 percent, the concentration of different leaching, different shades of color stripping, bleaching water stripping wilt a little shade.

4.2.4 with 27.5% hydrogen peroxide 10L, hydrogen peroxide stabilizer 3L, 36 ° Bé caustic soda 2L, 209 500L detergent 1L of water, reducing machine steaming, then five grid peregal O cook, soap making, can 15% into light.

4.2.5 with soda 5-10g / L, steaming stripping, washing soap making, can light 10-20% percent, after stripping bluish shade.

4.2.6 with 10g / L caustic soda, steaming stripping, washing soap making, you can light a 20% -30%, partial shade somber.

4.2.7 used sodium borate 20g / L steam stripping, can light 10-15%.

With 27.5% hydrogen peroxide 1-5L, 70 ℃ run within 4.2.8 Jigger 2, sampling, according to color shades to control the concentration of hydrogen peroxide and the number of channels, such as dark green walking two semi to be shallow about 10%, changed little shade.

4.2.9 in the Jigger put 250mL 250L water leaching at room temperature away two, peelable shallow 10-15%.

4.2.1O in the jigger can add peregal O and light soda ash stripping.

5. Dyeing process, for example defect refurbished

5.1 acrylic fabric flower color processing example

5.1.1 The light color flowers

5.1.1.1 Process:

Fabric, surfactants 1227, acetate → 30 minutes rose to 100 ℃, heat for 30 minutes → 60 ℃ hot water washing → → cold temperature 60 ℃, put dye, acetic acid for 10 minutes → gradually warming up 98 ℃, heat 40 minutes → gradually cool 60 ℃ out of cloth.

5.1.1.2 stripping formula:

Surfactant 1227: 2%; acetic acid 2.5%; bath ratio of 1:10

5.1.1.3 stained recipe:

Cationic dyes (conversion of the original process recipe) 2O%; acetic acid 3%; bath ratio 1:20

5.1.2 dark color flowers

5.1.2.1 Routing:

Fabric, sodium hypochlorite, acetic acid → heating 100 ℃, 30 minutes → cooling water → sodium bisulfite → 60 ℃, 20 minutes in cold water washing → → warm → 6O ℃, put dye, acetic acid → gradually raised to 100 ℃, insulation 4O minutes → gradually cooling 60 ℃ out of cloth.

5.1.2.2 stripping formula:

Sodium hypochlorite: 2O%; 10% acetic acid;

Bath ratio 1:20

5.1.2.3 chlorine formula:

Sodium bisulfite 15%

Bath ratio 1:20

5.1.2.4 stained recipe

Cationic dyes (conversion of the original process recipe) 120%

Acetic acid 3%

Bath ratio 1:20

5.2 nylon fabric flower color processing example

5.2.1 slight color flowers

When the color depth flower shades of difference 20% -3O% when dyeing itself may generally be 5% -10% of peregal O, compared with the same dye bath, between 80 ℃ -85 ℃ heat until the dye liquor When the depth of dyeing depth of about 20%, then slowly raised to 100 ℃, heat the dye as possible by fiber net absorption so far.

2.2 Medium color flowers

Medium colored flowers can be part of subtractive method again add dye to the original depth.

Na2CO35% -10%

Peregal O1O% -l5%

Bath ratio of 1: 20-1: 25

Temperature 98 ℃ -100 ℃

Time 90min-120min

After the cylinder subtractive fabric first with hot water, then cold water to clean, and finally stained.

2.3 serious color flowers

Process:

36 ° BéNaOH: 1% -3%

Peregal O: 15% ~ 20%

Synthetic detergents: 5% -8%

Bath ratio of 1: 25-1: 30

Temperature 98 ℃ -100 ℃

A time 20min 30min (to all bleaching date)

All gradually cooling after stripping thoroughly rinsed with water to clean, and then 0.5mL acetic acid, 30 ℃, 10min fully neutralize residual alkali, then rinse again staining. Some colors after stripping should no longer dye colors. After stripping because it turns pale yellow fabric background. This situation should be changed like color. For example: After the whole stripping camel, pale yellow background, if more stained tan, gray shade, the use of Pula red 10B, transfer to a small amount of yellow, the color change dyed Princess, insurable bright shade.

5.3 polyester fabric flower color processing example

5.3.1 slight color flowers,

Streak Putty or hot leveler l-2g / L, re-heated to 135 ℃ insulation 30min. Additional dyes l0% -20% of the original amount, pH value of 5, you can eliminate facial cloth flowers, spots, shade and color depth difference, the effect of normal production swatches basically the same.

5.3.2 serious color flowers

Sodium chlorite 2-5g / L, acetate 2-3g / L, methylnaphthalene l-2g / L;

30 ℃ start treatment, 2 ℃ / min heating to 100 ℃ treatment 60min, then washed the cloth.

5.4 cotton fabric dyed with reactive dyes severe defect processing example

Process: Stripping → oxidation → stained

5.4.1 Stripping

5.4.1.1 process recipe:

Hydrosulfite 5g / L-6g / L

Peregal O2g / L-4g / L

38 ° Bé caustic 12mL / L-15mL / L

Temperature of 60 ℃ -70 ℃

Bath ratio l: lO

Time 30min

5.4.1.2 operating methods and procedures

Bath ratio with water, add already weighed peregal O, caustic soda, sodium hydrosulfite, fabric machine, a steam heated to 70 ℃, stripping 30min. Stripping is completed, drain the residue was washed twice with water, then drain.

5.4.2 Oxidation

5.4.2.1 Process prescription

3O% H2O23mL / L

38 ° Bé caustic soda lmL / L

Stabilizer 0.2mL / L

Temperature 95 ℃

Bath ratio 1:10

Time 60min

5.4.2.2 operating methods and procedures

Bath ratio with water, add a stabilizer, caustic soda, hydrogen peroxide and other chemicals, open steam heated to 95 ℃, insulation 60min, then cooled to 75 ℃, drain water, plus 0.2 soda, wash 20min, drain; with 80 ℃ hot water 20min; 60 ℃ hot water 20min, cold water until completely cool cloth.

5.4.3 stained

5.4.3.1 Process prescription

Reactive dyes: 30% of the original amount of the process x%

Sodium Sulfate: the amount of the original process of 5O% Y%

50% z% the amount of the original process: Soda

Bath ratio l: lO

Temperature according to the original process

5.4.3.2 operating methods and procedures

Normal dyeing methods and steps.

6. Blended fabric stripping process brief

Disperse and acid dyes from two acetate fiber / wool blends, with 3-5% polyoxyethylene alkyl amine at 80 to 85 ℃, and pH5 to 6 under through 3O to 60 minutes and some stripping. This process is also available from two cellulose acetate / nylon and two cellulose acetate / cellulose acetate component on polyacrylonitrile fiber blends on partially removed disperse. From polyester / polyacrylonitrile or polyester / wool dyes part peeled, boiled carrier requires up to 2 hours. Add 5 to lO g / l of non-ionic detergent, and 1-2 g / l Rongalite can usually be improved polyester / polyacrylonitrile fiber obtained by stripping.

1 g / liter anionic detergent; 3 g / l of cationic retarding agent; and 4 g / liter of sodium sulfate after 45 minutes treatment at the boiling point and pH10. Partially stripped nylon / alkaline alkaline and acidic dyes polyester blended fabric.

1% non-ionic detergent; 2% cationic retarding agent; and lO% to l5% sodium sulfate treatment at the boiling point and pH5 90 到 120 minutes. Commonly used in wool / polyacrylonitrile fiber stripping.

With 2-5 g / l of caustic soda, and 2-5 grams / liter sodium hydrosulfite, reduction cleaning at 8O to 85 ℃ or in moderately alkaline solution Rongalite 120 ℃ under, from a polyester / cellulose blends removed many direct and reactive dyes.

With 3% to 5% Rongalite and an anionic detergent treated at 8O ℃ and pH4 4O-6O minutes. From two cellulose acetate / polyacrylonitrile fibers, titanium acetate fiber / wool, two cellulose acetate / nylon, nylon / polyurethane, and acid dyeable nylon ripped disperse and acid dyes on silk deformation.

1-2 g / l sodium chlorite, boiling at about pH3.5 1 hour from cellulose / poly blend fabric strip on polyacrylonitrile fiber dispersion, cationic, direct or reactive dyes. For triacetate fibers / polyacrylonitrile, polyester / polyacrylonitrile, and polyester / cellulose blends to be added when stripping a suitable carrier and a non-ionic detergent.

7. Production Notes

7.1 fabric before stripping or amend shade sample test must be done.

7.2 fabric must be strengthened after stripping water (cold, hot water).

7.3 Stripping should be short-term, if necessary, should be repeated.

7.4 stripping shall be based on the nature of the dye itself, such as resistance to oxidation, alkali resistance, chlorine bleaching properties, temperature, aid conditions require strict control. The amount of additives to prevent excessive or improper temperature control to produce stripping overdone or stripping of flowers. Loft subject only to determine the process if necessary.

7.5 When the fabric was partially stripping, the following situations:

7.5.1 For a dye color depth treatment, the dye will not change much shade, color depth changes will only appear, master stripping conditions, can achieve color swatches requirements;

7.5.2 For two or more and the same performance fabric dye fight with partial stripping process, which changes very little shade, due to the same level of dye but was stripped of color, the fabric will only be stripped depth changes.

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