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Technical / Reactive DyesTechnical Reference

1. General

The pattern card contains recommendations on exhaust dyeing, continuous dyeing, CPB and printing of cotton (CO) fibers with FUCAI reactive dyes.General M Type SeriesReactive HE SeriesReactive Deep Shade ED SeriesReactive Black SeriesReactive Liquid SeriesReactive Cold Pad Batch RGB SeriesReactive Printing SeriesFUCAI  offers reactive dyes for all application on cotton.The pattern card provides both information on dyeing processes and technical details.All of the dyes present self-shade and its combinations. Fastness data and application properties are presented comparatively in the pattern card. 

2. Main Characteristic and Properties of Reactive Dyes

FUCAI  developed a wide range to fulfill demands of customers by environmental sensibility. It is proved that choosing suitable pre-treatment, dyeing method and after treatment process, reactive dyes can present effective and reliable dyeing process and fastness levels for cotton fibers.According to its reaction active group and reaction property, reactive dyes can divide into X type containing di-chloro-triazine, HE type and P type containing mono-chloro-triazine (MCT), KN type containing vinyl sulfone (VS) and also M type containing double active group (or iso-bifunctional reactive group).M and KN type are suitable for dyeing at medium temperature 60℃. HE type is suitable for dyeing at high temperature 80℃, also suitable for exhaust dyeing, continuous dyeing and so on. P type is suitable for printing. ED type is a medium temperature type of reactive dyes with high fixation rate and high build-up rate.
General M Type Series M type property

Good reactivity and substantivity

Excellent acid and alkali stabilitySuitable for exhaust dyeing and continuous dyeingSuper compatibility and reproducibilityComplete chromatography
Reactive HE Series HE type is a series of dyes with good levelness and reproducibility, which is improve on basis of H type reactive dyes. The substantivity is lower during the beginning of dyeing, and the migration property is better compared with H type dyes. It can save dyeing time, simplifying dyeing process, improving wash-off property and good compatibility with H type dyes.
Reactive Deep Shade ED SeriesHD type is a new type dyes which contains iso-bifunctional reactive group, it is suitable for exhaust dyeing and continuous dyeing with high color fixing ratio and good ecological property. It can get good build-up property, excellent reproducibility during dyeing process, and perfect compatibility with M type dyestuff as well.
Reactive Black Series

Medium temperature type is carefully compounded. It is a series of dyes with good build-up property, good deep dyeing property and excellent stability. It contains different kinds of shades, suitable for the requirement of different clients.

Reactive Liquid Series Liquid dyes have the advantages of easy melting, dust free, convenient to use, environmental friendly and clean.
Reactive Cold Pad Batch RGB SeriesHigh fixationLess consumption of dyes and chemical compared with dyeing the same depth of shadeEnergy saving and environmental friendly
Reactive Printing SeriesGood quality, bright colorExcellent solubility, high color yieldEasy to wash, staining is not easy when washingSuitable for steaming or curing process

3. Application

      Hangzhou Fucai Chem Co.,Ltd offers reactive dyes for all application on cotton. Reactive dyes are used widely in the dyeing and printing for the cellulose fibers, also in the dyeing for cellulose component of T/C, N/C blending and interweaving. They have the advantages of easy dyeing, good wash fastness, environmental protection and so on. Reactive dyes are popular among the customers. Also, they are the main choice for high-end apparel brands.

4.  Dyeing Process

Taking advantage of the affinity with cellulose fibers, reactive dyes absorb on fibers.With accelerant of the salt (Glauber's salt 20-80g/L) and under the influence of temperature, they possess the properties of penetration and level-dyeing. Then under alkali condition (PH10.5~11.0) the combination of covalent bond of dyes and fibers occur. After washing and soaping process, it can meet the requirement of good washing fastness.



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Pad liquor (with 65-70% liquor pick-up)→Pre-drying→ Drying→Cooling→Salt and alkali padding→Steaming (102-105℃ 50-90 sec)→Running cold water washing→ Acid washing→ Soaping →Hot water washing→Warm water washing→Cold water washing→Drying and taking out of the fabric.X g/L       5-10g/L          0-1g/LDyes X g/L, Migration Inhibitor 5-10g/L, Penetrating Agent 0-1g/LSalt and Alkali Amount recommended 
Dyes g/L                          <10    10-20      20-30     30-40      40-50        >50
Caustic soda (36Be') ml/L    2       5           7            7            10           10-15
Soda ash    g/L                    20      20          20         20            20          20
Glauber's salt g/L             220     220        220       220          220         220

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      Pad liquor (with 65-70% liquor pick-up)→ Pre-drying → Drying→Curing (150-160℃2-3min.)→Running cold water washing→ Washing off→ Soaping→ Washing off→ DryingDyeing bath
Dyesx g/l
Baking soda10~40g/l
Migration inhibitor5~10g/l
S/ Resist salt S2~10g/l
Wetting agent0~1g/l

(2) vn88 vn88linkvn88Liên kết đăng nhập. EXHAUST PROCESS

Note: A: Dyes B: Glauber's salt C: Soda ash D: Auxiliary Exhaust Process: Washing→ Dyeing→ Fixation→ Washing→ Soaping boiling→ Washing→ Dehydration→Drying Process recipe and parameters
Dyes and chemicalsDosage
Dyeing  Reactive dyes (%)0.2-5.0(owf)
Glauber's salt (g/L)20-60
FixationSoda ash(g/L)5-20
Soaping boilingDetergent (g/L)3
 Process parametersLiquor ratio1:5-20
Dyeing temperature (℃)60
Fixation temperature (℃)60
Fixation time (min)30-60
  Soaping boiling temperature (℃)95-100
 Soaping boiling time (min)10-15

vn88 vn88linkvn88Liên kết đăng nhập(3). JIG DYEING PROCESS

 Note:  A: Dyes, B:Glauber's salt ,C:Soda ash    Jig dyeing Process: Washing→ Dyeing→ Fixation→ Washing→ Soaping boiling→ Washing→ Dyeing. 
Color shadesDye adding(passages)Glauber's salt(passages)Soda ash(passages)Dyeing fixing(passages)
Medium and pale1-23-45-68-10
Deep1-24-5  6-710-14


vn88 vn88linkvn88Liên kết đăng nhập(4). COLD PAD BATCH PROCESS(CPB) 

Notes:   a.Adopting two mangles padding evenly, the volume of the trough should be as small as possible at about 15-30 liter.   b.Utilizing the Mixing device to pump the dye liquor and alkali liquor with desired mixing ratio.   c.Applying the batching-up device with the speed setting.   d.The options of the horizontal washing are:       horizontal washing machine with not less than 7 compartments       or a winch beck dyeing machine       or a jig dyeing machine     Pad dyeing Yield: As the stability of the dye liquor and alkali liquor mixture is not very high, it is recommended to use the automatic dosing pump to transfer the pad liquor to the trough before the padding process.     Pad liquor pick-up: Cotton 65-70%, Viscose 80-100%     Batching up: After the padding, the fabric should be batched up with the edges aligned, then wrapped in plastic film and sealed to prevent the moisture content evaporated. The batched-up roll should be rotated to ensure the dyeing levelness.Standard process of short batching time in cold pad batch    Composition of Pad liquor: Dye solution:

Dyex g/l
Urea100 g/l
Wetting Agent2-5 g/l

Alkali liquor:

38°Be' /Caustic soda 38°Be' х g/l
Glauber 's salt/ Salt  30 g/l
        The dye and chemical amounts given above are referring to the total volume of the pad liquor in the automatic dosing pump with a mixing ratio of 4:1. That 80% of the total pad liquor volume will be consisted of the dye, wetting agent and urea, while caustic soda and salt should be accounted for 20% of the total pad liquor volume.The alkali demand should be calculated as below: 

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  Adding Salts can improve the dye fixation due to the color yield increasing (except the influential solubility on dye), the solubility of salt is higher than the solubility of Glauber's salt, and therefore it is preferred. But in some special case such as when dyeing with Reactive Blue R, Glauber's salt is the only choiceStandard Sodium Silicate method Composition of Pad liquor:

Dye х   g/l
Urea100   g/l
Wetting Agent2-5   g/l

 Recommended Alkali amounts:
Sodium Silicate ConcentrationSodium SilicateAmountDye

weight ratio

Besides Sodium Silicate, the required 32.5%(°Be') Caustic Sodium(ml/l)
 Modified Sodium Silicate methodThis method helps to reduce the silicate scale Pad liquor composition:
Dyeх g/l
Urea100 g/l
Wetting Agent2-5 g/l
 Alkali amount recommended:65g/l Sodium Silicate 37-40°Be', the amount of caustic soda will be adjusted according to the depth of the dyeing shade.
Dye  g/l<2030405060> 70
Caustic soda 38°Be' cc/l202525253035


One phase printing processPrinting paste recipe
Dyeх g
Urea50-100 g
Waterх g
Sodium alginate500 g
S/Resist salt S10 g
Baking soda5-30 g
Printing paste1000 g
 Recommended baking soda amount 
DyeBaking Soda
 Printing process: Printing→ Drying→Steaming→ WashingFixing methods: Steaming: 102-103℃, 5-10min, or curing: 150℃, 3-5min.After printing washing off (continuous washing compartments) 
 1st cellOverflow cold wash
2nd cellCold wash
3rd cellHot water,70℃
4th cellHot wash,70℃
5th cell 95℃ 插足2g/lHot wash,95℃ add 2g/l sequestering agent
6th cell 95℃ 插足2g/lSoaping, 95℃ add 2g/l sequestering agent
7th cellHot wash,70℃
8th cellCold wash
 Light color fastness:GB/T8427-1998(eqv ISO 105-B02-1994)Washing color fastness:GB/T3921.4-1997(eqv ISO 105-C04-1989)Rubbing color fastness:GB/T3920-1997(eqv ISO 105-X12-1993)Perspiration color fastness:GB/T3922-1995(eqv ISO 105-X11-1994)Chlorine bleach color fastness:GB/T8433-1998(eqv ISO 105-E03-1994) 

Notes on the pattern section:

Energy levels        Performance
M= medium
= Stable 
HE= high temperature
=  unsuitable
     Fastness properties were tested in accordance with SN-ISO 105 and international standards. Multi-fiber strip, specified as adjacent fabric, has not been mentioned attained rating for 5 in washing test ISO C03. Light fastness was tested at the 1/1, 2/1 and 1/3 standard depth (SD).

 Key to fastness table

ISO 105 C03:1989Washing fastness
AATCC 11A 49°CAmerican Association of Textile Chemists and Colorists, Washing fastness
ISO 105 X11:1994Hot pressing fastness
ISO 105 X12:1994Rubbing fastness
ISO 105 E04:1994Perspiration fastness
ISO 105 B02:1994Light fastness (Xenon arc fading lamp)
ISO 105 P01:1993Sublimation fastness
ISO 105 E03:1994Swimming pool fastness (fastness to chlorinated water)
CH=  Shade change
ACE= Staining on acetate
CO=  Staining on cotton
PA= 66 Staining on polyamide 66
CO=  Staining on cotton
AC=  Staining on acrylic
WO=  Staining on wool

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