Enzymatic textile bleach-whitening methods
A textile and textile technology, applied in the field of enzyme-catalyzed textile bleaching-brightening, can solve the problems of properly and completely removing sulfur derivatives
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Embodiment 1A、2 and 3
[0211] Enzyme-catalyzed bleaching-brightening according to the one-bath two-step exhaust method: prescoured and heat-set nylon 66 fabrics at 175°C using a liquor ratio of 20:1 in the amount of bleaching process, sodium carbonate, said ester substrate, hydrogen peroxide and said perhydrolase in a bath. The temperature was ramped from room temperature to a target temperature of 65°C at a rate of 2°C per minute. The bath was then held at 65°C for 30 minutes and then adjusted to pH 4.5 by adding acetic acid (80%). Subsequently, the optical brightener was added to the bath in the amount given in Table 1, and the treatment was continued at 65° C. for another 20 minutes. After draining, the fabric was rinsed twice at 50°C for 10 minutes each and then dried at 70°C. Each flush contained 0.5 g / l of a 25% solution of catalase T100 (purchased from Genencor).
Embodiment 1A
[0212] Table 1 Examples 1A, 2 and 3 - Enzyme Catalyzed Bleaching - Brightening
[0213] Example #
1A
2
3
Bleached products 1) [g / l]
0.9
0.9
0.9
Sodium carbonate buffer [g / l]
2.0
2.0
2.0
Ester substrate 2) [g / l]
3.0
3.0
3.0
Hydrogen peroxide 35% [ml / l]
6.0
6.0
6.0
Peroxidase 3) [mg / l]
1.7
1.7
1.7
FWA(1a) 4) [%]
0.4
0.36
FWA(2) 5) [%]
0.26
Shading dye 6)
6)
[0214] 1) LTC (commercially available from Huntsman)
[0215] 2) Propylene glycol diethyl ester
[0216] 3) corresponds to 1.0 g / l EcoWhite (1×) (product of Genencor)
[0217] 4) Fluorescent whitening agent of formula (1a); [%] based on the weight of fabric
[0218] 5) Fluorescent whitening agent of formula (2); [%] based on the weight of fabric
[0219] 6) 0.00025% of 7-phenyl-5,9-bis(ph...
Embodiment 1B
[0231] Enzyme-catalyzed bleaching-brightening according to the two-bath two-step exhaust method:
[0232] (i) Pre-scoured and heat-set nylon 66 fabric at 175°C, treated with a bath ratio of 20:1 in a bath containing:
[0233] According to the 0.9g / l bleaching process given in Table 1,
[0234] 2.0g / l sodium carbonate buffer,
[0235] 3.0 g / l ester substrate (propylene glycol diethyl ester)
[0236] 6.0ml / l of 35% hydrogen peroxide, and
[0237] 1.7 mg / l of perhydrolase, which corresponds to 1.0 g / l of EcoWhite (1x) (product of Genencor).
[0238] The temperature was ramped from room temperature to a target temperature of 65°C at a rate of 2°C per minute. The bath was then held at 65°C for 50 minutes. After draining, the fabric was rinsed twice at 50°C for 10 minutes each and then dried at 70°C. Each flush contained 0.5 g / l of a 25% solution of catalase T100 (product of Genencor).
[0239] (ii) The dried fabric obtained according to step (i) was treated with a liquor r...
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