Preparation of cellulosic materials

A cellulosic and enzyme system technology, applied in the field of degumming and bleaching cellulosic and desizing, can solve problems such as joint difficulties, achieve uniform dust removal, high moisture absorption, and reduce waste liquid outflow.

Inactive Publication Date: 2006-01-18
NOVOZYMES NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When enzymes are used in the desizing or degumming process, in order to obtain consistently high quality results in commercial quantities of textiles, the desizing and degumming steps are usually performed separat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: Using H 2 o 2 Simultaneous biological degumming and bleaching

[0077] A. Biodegumming and Bleaching: A 45 cm x 21.5 cm fabric weighing approximately 25 grams was cut from an interlocking 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 (pH9.2) containing 3000APSU / kg of fiber pectate lyase, 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.

[0078] 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 measures the time in seconds fo...

Embodiment 2

[0080] Example 2: Using H 2 o 2 / TAED simultaneous biological degumming and bleaching

[0081] Use the same fabric and equipment as in Example 1 above. The experiment was carried out in essentially the same manner as in Example 1, except that 20 mmol TAED (Aldrich) was added to the bio-degumming / bleaching solution.

[0082] The results are shown in Table 1. The presence of TAED in the biodegumming / bleaching bath dramatically increased the whiteness and wettability of the fabric. This also results in significant dust removal efficiency.

Embodiment 3

[0083] Example 3: Using H 2 o 2 / TAED / NaOH simultaneous biological degumming and bleaching

[0084] Use the same fabric and equipment as in Example 1 above. The experiment was carried out in essentially the same manner as in Example 1, except that 2 g / l NaOH was added to the bioregumming / bleaching solution.

[0085] The results are shown in Table 1. Surprisingly, unlike conventional peroxide bleaching, the addition of sodium hydroxide to the biodegumming / bleaching bath did not further improve fabric whiteness and wettability. In fact, this has a certain negative impact on whiteness and dust removal efficiency.

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PUM

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Abstract

The present invention provides methods and compositions for desizing, scouring and bleaching of cellulosic materials, which are carried out by contacting the cellulosic materials simultaneously or sequentially in a single-bath process with an enzyme system and a bleaching system comprising hydrogen peroxide or at least one peroxy compound which generates hydrogen peroxide when dissolved in water, or combinations thereof, and at least one bleach activator.

Description

field of invention [0001] The present invention relates to methods and compositions for treating cellulosic materials, more particularly to methods and compositions for desizing, scouring and bleaching cellulosic materials. Background of the invention [0002] The processing of cellulosic, such as cotton, fibers into clothing manufacturing materials involves several steps: spinning the fibers into yarns; constructing woven or knitted fabrics from the yarns; and subsequent preparation, dyeing, and finishing operations. The preparation process may involve desizing (for textiles), degumming and bleaching to produce a textile suitable for dyeing or finishing. [0003] A. Desizing: Textiles are the main form of textile fabric construction. The weaving process requires that the bent yarn be "sized" to protect it from fraying. After the weaving process, the size must be removed as the first step in preparing the textile. Starch, polyvinyl alcohol, carboxymethyl cellulose, waxes ...

Claims

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Application Information

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IPC IPC(8): C11D7/42C11D3/386D06L1/00D06L1/12D06L1/14D06L3/02D06L4/40D06M10/00
CPCD06L1/12D06L3/021D06L3/02D06L3/023D06L1/14D06L1/00D06L3/11D06L4/40D06L4/12D06L4/13D06L4/10
Inventor 徐辉刘纪印埃里克·奥托布赖恩·康登
Owner NOVOZYMES NORTH AMERICA INC
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