How to increase the fastness of activated cyan blue
Abstract: Active cuilan has poor color fastness, especially on heavy cotton velvet fabrics. It is difficult to achieve fastness requirements. Pretreatment hairiness, dye penetration, and soaping floatation are the key factors affecting color fastness; by selecting suitable soaping agents, fixing agents, and wet friction enhancing agents, the fabric can be significantly improved. Degree to achieve the color fastness requirement.
l Preface
Cotton knitted fabrics have many advantages such as good hygroscopicity, breathability, warmth, applicability, soft hand feeling, comfortable wearing, good dyeing performance, and high quality and low price. However, there are problems with the color fastness of some colors, particularly the heavy cotton velvet fabrics dyed with active cyan, and the various color fastnesses are difficult to meet.
At present, international and domestic standards are imposed on textile products, among which strict rules are imposed on color fastness. In order to meet the needs of domestic and international, our printing and dyeing factories have to find ways to improve the color fastness of fabrics.
2 Dyeing and Finishing Process
2.1 Fabric
Cotton knitted fleece (32S/32S, 300g/m2)
2.2 Dyeing equipment
High temperature and high pressure overflow dyeing machine
2.3 Test Standard
2.3.1 Fixing and discoloration evaluation
The Datacolor colorimeter measures the difference in lightness, the red-green color difference, the yellow-blue color difference, and the total color difference (represented by ΔL*, Δa*, Δb*, and ΔE*, respectively). The larger the value, the greater the color change.
2.3.2 soaping fastness evaluation according to national standard GB/T3921.3-1997 method.
2.3.3 Perspiration fastness evaluation According to national standard GB/T 3922-1995 method.
2.3.4 The resistance to chlorine water fastness is evaluated according to GB/T8433-1998.
2.4 Process Flow
Turning seam → boiled and rinsed → Bath washing → Dyeing → Washing → Neutralization → Soaping → Washing → Fixing and softening → Fastness of wet rubbing → Curing → Finished product inspection
2.4.1 pre-treatment (boil and float a bath)
In order to save energy consumption, a one-bath process of boiling and bleaching can be used, and the process conditions are as follows:
Hydrogen peroxide (30%) 5g/L
Scouring agent TF-120B 1g/L
Liquid caustic (30%) 4g/L
Bath ratio 1:10
Conditions 100°C×50min
The two important quality indicators after the pretreatment are the gross effect and the whiteness. Among them, the gross performance index has an important influence on the color fastness. Insufficient gross effect, dye molecules can not fully enter the fabric dyeing process, adsorbed on the fabric surface too much dye, resulting in floating color, reducing the fabric's color fastness. The gross effect of the fabric should generally reach lOcm/30min or more, and the hair effect should be very uniform.
2.4.2 Staining Activity Cuilan KN-G6% (o.w.f)
Yuan Mingfen 60g/L
Soda 25g/L
Leveling agent for cotton TF-210A1g/L
Anti-wrinkle agent in the bath TF-208C1g/L
Bath ratio 1:10
The cotton fleece of this specification is very thick and tight, and it is difficult for the dye molecules to fully enter the interior of the fabric, and the addition of a large amount of electrolytes such as Yuan Mingfen and soda ash in the dyeing liquid also reduces the penetration and diffusion of the dye liquor in the fabric. The leveling agent for cotton TF-210A has good solubilizing effect on reactive dyes, and has excellent permeability and dispersibility, can promote the dyes to penetrate the fabric more easily, obtain good dye-transmission effect, and improve the color fastness. .
2.4.3 Soaping Soaping Agent TF-130B(A)1.5%(O.w.f)
Bath ratio 1:10
Conditions 85-90°C×20min
Soaping can remove unfixed as well as hydrolyzed dyes. During the soaping process, two issues should be emphasized: 1. The removal of floating color and contamination are a dynamic balance. The soap lotion and process selected must be able to effectively remove the floating color of the fabric, and at the same time effectively prevent the soap from being The dye re-stained the fabric. 2, activated cuilan and other vinyl sulfone type dyes and fibers with ether bond, the ether bond is good acid resistance but poor alkali resistance, in the alkaline and high temperature conditions, the covalent bond of dye and fiber is easy to break new The floating color reduces the apparent depth of the fabric while affecting the color fastness. Therefore, soaping process is not easy to use high alkali and high temperature. 3. Heavy metal ions such as Ca2+ and Mg2+ in the water have a negative impact on the soaping effect, and the water quality should be improved during soaping. The use of traditional non-surface active soap lotion has poor anti-sticking effect on dyes and does not improve water quality. It is not recommended. Highly effective soaping TF-130B(A) is a chelating dispersing soaping agent with a near-neutral pH, which can effectively remove the floating color on the fabric, prevent the re-staining of the dye, and soften the water quality. Less hydrolysis of the dye. When setting the soaping process, the temperature should not be too high, select 90 °C. If the floating color of the fabric is not completely removed, it will seriously affect the fixation of the subsequent process. On such heavy fabrics, soaping should be selected twice.
2.4.4 Fixing and Softening One Bath Fixing Aldehyde Fixing Agent TF-232(TF-232A)2%(o.w.f)
Flaky softener TF-441C (1:10 dilution) 2.5% (o.w.f)
Bath ratio 1:10
Conditions 50°C×20min
Table 1 Fixing and softening after finishing
Test index
Technology
â–³L*
â–³a*
â–³b*
â–³E*
1
O.37
-0.66
1.08
1.32
2
0.30
-0.29
0.35
0.54
Process 1: TF-232 and TF-441C compound, process 2: TF-232A and TF-441C compound.
Table 2 Fixation and Softness after Finishing
Technology
Test index
l
2
Unfixed
soap
wash
White dip
4
3—4
2-3
Discoloration
4-5
4-5
4
sweat
Stains
White dip
4-5
4
2-3
Discoloration
4-5
4-5
4
Mo
rub
Dry friction
4
4
3—4
Wet motor
2-3
2-3
2
Chlorine resistant water
3—4
3—4
2-3
Fixing agent TF-232, TF-232A and softener TF-441C have good compatibility. To shorten the process flow, fixing and softening can be completed in one bath. After treatment, the fabrics' fastness can be significantly improved. Among them, TF-232 has a faster improvement than TF-232A. In general, the degree of color fastness and the color change of fixing agents are a contradiction. TF-232A's color change is very small, and has a good color fixing effect, can meet the needs of most customers; TF-232's fixation color change is slightly larger, but the fastness is greatly improved, suitable for color fastness Request very high orders.
After the above-mentioned process, the problem of soaping, perspiration, and chlorine fastness of the fabric can be solved, and a very fluffy and soft hand can be obtained, but the wet rubbing fastness cannot fully meet the customer's requirements.
2.4.5 Wet friction fastness treatment
Table 3 Fixing the color softness and wet rub fastness
Test index
Technology
â–³L*
â–³a*
â–³b*
â–³E*
3
0.40
-0.57
1.15
1.34
4
0.28
-0.32
O.37
0.56
Process 3: TF-232 and TF-441C are compounded and immersed for 20 minutes, and then the wetness and friction enhancer are immersed for another 20 minutes; Process 4: TF-232A and TF-441C are compounded and immersed for 20 minutes, and then the wetness and friction enhancer are continued. Soak for another 20min.
Table 4 Fixation Softness, Fastness after Friction Fastness Increased Fastness
Technology
Test index
3
4
Unfixed
soap
wash
White dip
Brushed Poly Fabric,Grey Polyester Fabric,Polyester Plain Fabric,White Microfiber Fabric
CHANGXING YONGXIN IMPORT AND EXPORT CO.,LTD , https://www.cxyxfabric.com