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Short-flow environment-friendly degumming and bleaching method for hemp fibers

A technology of hemp fiber and short process is applied in the field of environmental protection degumming and bleaching of hemp fiber short process, which can solve the problems of large water consumption, short production process, poor adaptability of strains, etc., so as to save production cost, shorten production process, and reduce lignin content. Effect

Active Publication Date: 2012-10-03
郑州银泰企业管理咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological degumming production process is short, but there are problems such as unstable enzyme activity of the strain, poor strain adaptability, weak anti-bacteria ability, low efficiency, and difficult control of the process. The quality of degumming between batches varies greatly, and the quality stability is poor. It must be supplemented by chemical degumming to meet the requirements of the subsequent process.
[0003] The commonly used chemical degumming process includes: two cooking and one bleaching method, two cooking and one bleaching and one scouring method, after scouring, it needs to go through processes such as scorching and hemp beating, the process is long, especially the disc degumming machine consumes a lot of water, Each ton of hemp needs 500-600 tons of water, and the production cost is high. The improved continuous fiber-separating washing machine uses about 100 tons of water for one wash. The quality cannot meet the requirements after the first wash, and a second wash is required, plus scouring and bleaching. The water consumption exceeds 300 tons, and the produced fibers still have a lot of lignin. After being woven into fabrics, they need to be bleached and processed according to the hemp process, which consumes a lot of energy costs such as water and steam, and the production cost is high. The treated sewage Contains harmful chemical components such as sodium hypochlorite and sodium chlorite. The COD value is generally greater than 4000, which is very easy to pollute the environment, and the processing time is long, so it is not easy to recycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The hemp fiber short-process environmental protection degumming and bleaching method has the following steps:

[0019] 1) Put 200 kg of hemp bast after mechanically rolling and removing impurities into the boiling tank, add 1600 kg of washing water after degumming and bleaching, and wash twice in 40°C water for 10 minutes each time;

[0020] 2) Add 1600kg of recovered water after degumming and bleaching into the boiling tank, wash the hemp bast with water, and heat it up to 80°C for 10 minutes;

[0021] 3) After washing, add 1600kg of clean water, add the following additives according to the water weight, stir evenly, and prepare the degumming and bleaching soaking solution:

[0022] Nano clay preparation: 4g / L, caustic soda: 4g / L, soda ash: 2g / L, hydrogen peroxide: 8g / L;

[0023] 4) Warm up the degumming and bleaching soaking solution soaked with hemp bast to 80°C and keep it warm for 20 minutes, then raise the temperature to 98°C and keep it warm for 40 minutes at a ...

Embodiment 2

[0028] The hemp fiber short-process environmental protection degumming and bleaching method has the following steps:

[0029] 1) Put 200kg of hemp bast that has been mechanically rolled and removed into the bleaching vat, add 2000kg of recovered water after degumming and bleaching into the basting vat, wash the hemp bast with warming water, and heat it up to 75°C to keep it warm 15 minutes;

[0030] 2) After washing, add 2000kg of clean water, add the following additives according to the water weight, stir evenly, and prepare the degumming and bleaching soaking solution:

[0031] Nano clay preparation: 4g / L, caustic soda: 4g / L, soda ash: 2g / L, hydrogen peroxide: 9g / L,

[0032] 3) Warm up the degumming and bleaching soaking solution soaked with hemp bast to 85°C and keep it warm for 10 minutes, then raise the temperature to 97°C and keep it warm for 42 minutes at a heating rate of 1.5°C per minute, and degumming and bleaching the hemp bast in the same bath ;

[0033] The cou...

Embodiment 3

[0037] The hemp fiber short-process environmental protection degumming and bleaching method has the following steps:

[0038] 1) Put 200 kg of hemp bast after mechanically rolling and removing impurities into the boiling tank, add 2000 kg of washing water after degumming and bleaching, and wash twice at 45 ° C for 10 minutes each time;

[0039] 2) Add 2000 kg of recovered water after degumming and bleaching into the bleaching tank again, wash the hemp bast with water, heat up to 85° C. and keep it warm for 10 minutes;

[0040] 3) After washing, add 2000kg of clean water, add the following additives according to the water weight, stir evenly, and prepare the degumming and bleaching soaking solution:

[0041] Nano clay preparation: 3g / L, caustic soda: 3g / L, soda ash: 1g / L, hydrogen peroxide: 10g / L;

[0042] 4) Warm up the degumming and bleaching soaking solution soaked with hemp bast to 75°C and keep it warm for 25 minutes, then raise the temperature to 95°C and keep it warm fo...

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Abstract

The invention relates to a short-flow environment-friendly degumming and bleaching method for hemp fibers. The method is characterized by performing one-bath degumming and bleaching on hemp bast by adopting a deep oxidation principle and utilizing materials such as a nano-clay preparation, hydrogen peroxide and the like. The method comprises the following steps of: 1) performing impurity-removing washing on the hemp bast for 1 to 3 times by using recycled washing water; 2) performing temperature-rising washing on the hemp bast for 1 to 3 times by using the recycled water again; 3) performing the one-bath degumming and bleaching on the hemp bast by using 3 to 4 g / L nano-clay preparation, 3 to 4 g / L sodium hudroxide, 1 to 2 g / L sodium carbonate and 5 to 10 g / L hydrogen peroxide; 4) washing with water after performing the one-bath degumming and bleaching; and 5) processing the hemp bast into ramie cotton blended yarns after shaking hemp, curing and drying. Compared with the prior art, the method has the advantages that: the processes of embossing the hemp and beating the hemp are saved by adopting a deep oxidation method; the production flow is shortened; and the water dosage is greatly reduced; 2) the whiteness and the softness are high; and 3) the chemical oxygen demand (COD) value of the process waste water is low.

Description

technical field [0001] The invention relates to the field of hemp degumming and bleaching, in particular to a short-process and environmentally friendly degumming and bleaching method for hemp fibers. Background technique [0002] Traditional hemp processing methods generally include processes such as biological degumming, chemical degumming, kneading, and beating. The biological degumming production process is short, but there are problems such as unstable enzyme activity of the strain, poor strain adaptability, weak anti-bacteria ability, low efficiency, and difficult control of the process. The quality of degumming between batches varies greatly, and the quality stability is poor. It must be supplemented by chemical degumming to meet the requirements of the subsequent process. [0003] The commonly used chemical degumming process includes: two cooking and one bleaching method, two cooking and one bleaching and one scouring method, after scouring, it needs to go through p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01C1/00D01C1/02
Inventor 祝洪哲
Owner 郑州银泰企业管理咨询有限公司
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