Single-bath preparation of cellulosic materials
A cellulosic, single-bath technology, applied in the field of degumming and bleaching cellulosic and desizing, can solve the problems of uneven dyeing, uneven removal of cleaning alkaline residues, environmental problems, etc., to achieve uniform dust removal, short processing time, The effect of high moisture absorption
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Embodiment 1
[0072] Example 1: Using H 2 o 2 Simultaneous biodegumming and bleaching in one bath
[0073] A. Biodegumming and Bleaching: A 45 cm x 21.5 cm fabric weighing approximately 25 grams was cut from an interlock knit fabric (Type 4600, Ramseur Co., NC). The fabric was loaded into a Labomat beaker (Mathis Labomat, Werner Mathis USA, Inc, NC), and then poured into 250 ml of 20 mM sodium bicarbonate-sodium carbonate buffer solution (pH 9.2) containing 3000 APSU / kg of fiber pectinate. Synthase, 0.5g / l wetting agent (Kierlon Jet B, BASF), 1.7g / l H 2 o 2 and 0.75 g / l stabilizer (Calgon, Dexter). The fabric was treated at 55°C for 15 minutes and then ramped to 70°C at 5°C / minute for 1 hour. The fabric was then washed thoroughly under tap water to remove residual chemicals and dried overnight at room temperature.
[0074] B. Analysis: The whiteness of the fabric is measured in Ganz units by means of a Macbeth color eye. Wet absorption is determined by means of the drop test, which m...
Embodiment 2
[0076] Example 2: Using H 2 o 2 / NaOH single-bath simultaneous biological degumming and bleaching
[0077] Use the same fabric and equipment as in Example 1 above. Experiments were carried out in essentially the same manner as in Example 1, except that 2 g / l NaOH was added to the bioretting / bleaching solution.
[0078] The results are shown in Table 1. The presence of alkali dramatically increases the whiteness of the fabric. However, due to the denaturation of the enzyme by alkali, the hygroscopicity is poor.
Embodiment 3
[0079] Example 3: Using H 2 o 2 / NaOH single bath sequential (sequential) biological degumming and bleaching
[0080] A. Biodegumming: A 45 cm x 21.5 cm fabric weighing approximately 25 grams was cut from a link knit fabric (type 4600, Ramseur Co., NC). The fabric was loaded into a Labomat beaker (MathisLabomat, Werner Mathis USA, Inc, NC), and then poured into 250ml of 20mM sodium phosphate buffer solution (pH 9.2) containing 3000APSU / kg of fiber pectate lyase and 0.5g / l Wetting agent (Kierlon Jet B, BASF). The fabric was treated at 55°C for 15 minutes.
[0081] B. Bleaching: Add H to the same beaker 2 o 2 , NaOH and sodium silicate. h 2 o 2 , NaOH and sodium silicate final concentrations are the same as in Example 1 above. The Labomat temperature was raised to 70°C at 5°C / min for 1 hour, after which the water was drained. The fabric was then washed thoroughly with tap water to remove residual alkali and dried at room temperature.
[0082] The results are shown in...
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Property | Measurement | Unit |
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Whiteness | aaaaa | aaaaa |
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