Method for bleaching fibrous articles

A technology for fiber products and oxidants, applied in bleaching products, chemical instruments and methods, textiles and papermaking, etc., can solve the problems of low strength, no improvement in whiteness, drying of fiber products, etc., and achieves inhibition of embrittlement or hardening, Minimize environmental burden and ensure bleaching effect

Inactive Publication Date: 2005-09-28
NAT INST OF ADVANCED IND SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Irradiation of light with low intensity from cheap light sources for a long time compared to irradiation of high-intensity light creates the problem that the fiber product dries during the light irradiation and, once dried, the bleaching reaction does not proceed even under the light irradiation , as a result the whiteness is no longer improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A 50-count plain weave fabric of 100% cotton (warp density 148 yarns / inch, weft density 80 yarns / inch) was desized and scoured in the usual manner, then padded with 6% aqueous sodium percarbonate solution (pump speed 100%). Use 2mJ / cm 2 Each pulse, XeF excimer laser (351 nm) at 20 Hz, irradiates the fabric with light for 10 minutes. At this point the aqueous sodium percarbonate solution was added again by padding, and light irradiation from the XeF excimer laser was continued for another 10 minutes. The fabric is then washed and dried in the usual manner. Using Macbeth Color Eye 7000, the whiteness (JIS Z-8715, 1991) and yellowness index (JIS K-7103, 1997) of the cotton fabric thus bleached were measured and were 81.7 and 2.2, respectively. The tensile strength in the weft direction of the cotton fabric was also measured (JISL-1096A, test for tearing edge yarn strip strength) and found to be 463.54N.

Embodiment 2

[0042] The same fabric used in Example 1 was treated as in Example 1, except that the initial padding was followed by XeF excimer laser light irradiation for 5 minutes, and by padding, the reagent solution (6% percarbonate sodium aqueous solution), and light irradiation for 5 minutes, and the addition and light irradiation were repeated two more times. The total number of padding steps is 4 and the total time of the XeF excimer laser is 20 min. The bleached cotton fabric was colorimetrically analyzed as in Example 1 and found to have a whiteness of 82.8 and a yellowness index of 1.6. The weft tensile strength of the same cotton fabric is 442.96N.

Embodiment 3

[0044] The same fabric used in Example 1 was treated as in Example 1, except that an appropriate amount of aqueous sodium percarbonate solution was added again by spraying. The bleached cotton fabric was colorimetrically analyzed as in Example 1 and found to have a whiteness of 81.6 and a yellowness index of 2.2. The weft tensile strength of the same cotton fabric is 466.48N.

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Abstract

In a method for bleaching fibrous articles by impregnating the fibrous articles with oxidizing or reducing agent solutions and irradiating the impregnated fibrous articles with ultraviolet or visible light, the oxidizing or reducing agent solutions are re-added one or more times to the fibrous articles while they are being irradiated with ultraviolet or visible light.

Description

technical field [0001] The present invention relates to methods of bleaching fiber products using oxidizing or reducing agents and light energy including low intensity light sources of ultraviolet and / or visible light. Background technique [0002] Bleaching of fiber products, including natural fibers such as cotton and wool as well as recycled Products of fibers such as viscose rayon and polynosic. A typical industrial bleaching process involves boiling for about 0.5-2 hours and continuous washing in the presence of an oxidizing or reducing agent. Another method involves using a solution of this chemical agent (oxidant or reducing agent) at an appropriate concentration, padding so that the agent is adsorbed on the fiber product in an amount ranging from 80-110% by weight of the fiber product, and in a steam atmosphere ( ie steam), heating at about 95°C for about 0.5-1 hour. In general, oxidizing agents are often used in plant fibers such as cotton and flax, while reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D7/54D06L3/02D06L4/30D06L4/50D06L4/70
CPCD06L3/04D06L3/14D06L3/10D06L3/02D06L4/10D06L4/30D06L4/50D06L4/70
Inventor 大内秋比古傍岛光郎伊藤順
Owner NAT INST OF ADVANCED IND SCI & TECH
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