Method for bleaching tossa

A jute fiber and fiber technology, applied in the field of jute fiber bleaching, can solve the problems of poor impurity removal effect, environmental pollution, and weak lignin removal effect

Inactive Publication Date: 2009-06-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium chlorite has good bleaching effect and delignification ability, and has little damage to fibers, but it will generate a variety of toxic substances during bleaching, which will bring serious pollution to the environment.
Although hydrogen peroxide bleaching is an environmentally friendly bleaching method, it has a weak effect on lignin removal and poor impurity removal effect

Method used

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  • Method for bleaching tossa

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The jute used is the scorched tip fiber (80-120cm in length), see the specific bleaching steps figure 1 . During the bleaching step:

[0028] (1) peroxide treatment

[0029] Sequentially add 1% of the penetrant JFC, 1.5% of sodium pyrophosphate, 6% of soda ash, and 8% of peracetic acid according to the percentage of fiber weight within 8 minutes, control the bath ratio (weight ratio) 1:20, and then use 3°C / min to 80°C, hold for 60min;

[0030] (2) Two washes

[0031] The first water washing is to raise the room temperature water to 50 °C at a rate of 3 °C / min, and keep warm for 10 minutes before draining; the second water washing is to wash at room temperature for 5 minutes and then drain;

[0032] (3) oxidation bleaching

[0033] Add 0.3% penetrant JFC and 15% hydrogen peroxide according to fiber weight percentage in 4 minutes, adjust the pH value to 10.5, control the bath ratio (weight ratio) 1:10, and then rise to 1.5°C / min. 80°C, and keep warm for 80min;

[0...

Embodiment 2

[0041] The jute used is boiled root fiber (60-100cm in length), see the specific bleaching steps figure 1 . During the bleaching step:

[0042] (1) peroxide treatment

[0043] Add 1.5% of penetrant JFC, 1% of tetraacetylethylenediamine, 5% of soda ash, and 10% of sodium perborate according to the percentage of fiber weight within 4 minutes, and control the bath ratio (weight ratio) 1:15 , then rise to 70°C at 2°C / min and keep warm for 60min;

[0044] (2) Two washes

[0045] The first water washing is to raise the room temperature water to 50 °C at 5 °C / min, keep warm for 5 minutes and then drain; the second water washing is to wash at room temperature for 5 minutes and then drain;

[0046] (3) oxidation bleaching

[0047] Add 0.5% penetrant JFC and 20% hydrogen peroxide according to the fiber weight percentage in 8 minutes, adjust the pH value to 11, control the bath ratio (weight ratio) 1:15, and then increase it at 2°C / min to 85°C, and keep warm for 90min;

[0048] (4...

Embodiment 3

[0055] The jute used is cut and boiled short hemp (length 4-8cm), see the specific bleaching steps figure 1 . During the bleaching step:

[0056] (1) peroxide treatment

[0057] Add 1.5% penetrating agent JFC, 2% sodium phosphate, 7% soda ash, and 10% sodium percarbonate in percent by fiber weight within 6 minutes, control the bath ratio (weight ratio) 1:15, and then 2°C / min to 60°C, hold for 80min;

[0058] (2) Two washes

[0059] The first water washing is to raise the room temperature water to 50 °C at a rate of 5 °C / min, and keep warm for 10 minutes before draining; the second water washing is to wash at room temperature for 5 minutes and then drain;

[0060] (3) oxidation bleaching

[0061] Add 0.2% penetrant JFC and 25% hydrogen peroxide according to the fiber weight percentage in 8 minutes, adjust the pH value to 10, control the bath ratio (weight ratio) 1:10, and then increase the temperature at 1.5°C / min. to 80°C, and keep warm for 90min;

[0062] (4) Washing ...

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Abstract

The process of bleaching jute fiber includes the following steps: treating with peroxide, twice water washing, oxidization bleaching, water washing, neutralizing and water washing. The bleaching process has high fiber whiteness, less damage on fiber, high fiber separating index, high impurity eliminating effect, less yellowing of the fiber product, and capacity of improving the spinnability and dyeing and finishing performance of the fiber.

Description

technical field [0001] The invention belongs to the field of hemp fiber bleaching, in particular to a jute fiber bleaching method. Background technique [0002] With the improvement of human living standards, people's requirements for clothing have shifted from durability to comfort, and people's demand for biodegradable and environmentally friendly natural fibers is increasing. This has led to a situation in which demand exceeds supply in the market. At the same time, due to the limitation of natural fiber production, people are forced to seek new natural fibers. The easiest way is to improve the existing natural fibers that have not been used in the field of clothing. fiber. Hemp fiber is one of the most concerned natural fibers nowadays. In addition to ramie and flax, which have been used in clothing, jute fiber has attracted more and more attention due to its cost advantage. [0003] Jute is a lignocellulosic fiber whose main components are cellulose (58%-63%), hemice...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06L3/16D06L4/75
Inventor 蔡再生王维明程隆棣俞建勇
Owner DONGHUA UNIV
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