Method for efficiently degumming hemp by means of peroxidating at low temperatures under low-emission conditions

A technology of hemp peroxide and degumming method is applied in the direction of producing bast fiber by chemical method, which can solve the problems of difficulty in promotion, difficult to master the production process, long time for microbial treatment, etc. dyeability and dyeability, the effect of shortening the degumming process time

Active Publication Date: 2017-02-15
DONGHUA UNIV
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Problems solved by technology

The most commonly used degumming method is chemical degumming, also known as the second boiling method. The process of this method is very cumbersome, consumes a lot of water, and takes a long time, about 6 hours (2 hours for pickling, 1.5 hours for the first cooking, and 2.5 hours for the second cooking)
The development of new additives such as pentasodium, surfactants, and non-acid leaching preparations has improved the degumming efficiency of hemp, which takes 90 to 150 minutes, but still requires high-temperature and high-pressure scouring with chemical preparations, which will cause a large loss in the quality of hemp fibers, and A large amount of alkaline wastewater with high COD content and high chroma will be produced, causing environmental pollution
Among them, the chemical and enzyme combined degumming method can reduce the number of scouring, save time-consuming (about three hours: 1h chemical degumming, 2h enzyme degumming) labor-intensive beating process, and reduce the damage of hemp fiber, but due to the current degumming The role of enzymes is single, while the structure of colloids in hemp is complex, the residual gum rate is not up to the standard, the production conditions are high, the production process is difficult to master, the equipment investment is large, and the production cost is high. At present, it cannot be widely used under industrial conditions, so it is difficult to promote
In addition, the combined chemical and biological degumming method takes a long time for microbial treatment (24h microbial degumming, 2h chemical degumming), although it is feasible, but the fiber quality after degumming is poor

Method used

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  • Method for efficiently degumming hemp by means of peroxidating at low temperatures under low-emission conditions
  • Method for efficiently degumming hemp by means of peroxidating at low temperatures under low-emission conditions
  • Method for efficiently degumming hemp by means of peroxidating at low temperatures under low-emission conditions

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Experimental program
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Effect test

Embodiment 1

[0030] Sodium peroxide / urea / water is formulated into a treatment solution with a mass ratio of 10% / 9% / 81% and pre-cooled to -10°C. After the raw ramie is cleaned, it is spread on the treatment net and immersed in Pre-cool the treatment solution for 1 min while applying a slight mechanical tapping. After treatment, the fiber is washed with a -10°C treatment solution and the treatment solution is recovered. The fiber is washed with water at 25°C until it is neutral and then dried naturally at room temperature. Raw ramie before degumming treatment and ramie fiber after degumming treatment such as figure 2 Shown in A and 2B. The initial modulus of the degummed fiber is reduced to 8.1±3.2GP from 19.9±5.9GPa of the traditional process, the crystallinity is reduced from 81.78% of the fiber obtained by the traditional process to 50.02%, and the moisture regain is increased from 8.83% to 11.07%. The dyeing performance is significantly improved, and the K / S value of dyeing depth is inc...

Embodiment 2

[0032] The mass ratio of lithium peroxide / thiourea / water is 10% / 12% / 78% to prepare the degumming treatment solution. After the raw flax hemp is washed, it is laid on the treatment net, and the treatment solution is sprayed. The moistened raw hemp was frozen at -5°C for 5 minutes, and mechanically tapped. Then the fibers were washed with a -5°C treatment solution. After washing, the treatment solution was recovered. The fibers were washed with water at 20°C until they were neutral, and then at 50°C. Fast drying treatment. By comparing the dyeing performance of the fiber before and after the low temperature treatment, the dyeing depth K / S value of the flax fiber after the treatment is increased by 101.4%. The initial modulus of flax fiber after treatment decreased by 40.4%, indicating that low temperature treatment can improve the softness of flax fiber.

Embodiment 3

[0034] The mass ratio of potassium peroxide / urea / water is 9% / 12% / 79% to prepare the degumming treatment solution and put it into the padding tank, the hemp fiber bundle is applied with the treatment solution through the padding tank, and then the fiber bundle is placed Frozen treatment at -25°C for 30s, repeat the padding and freezing process for 2 times. After padding, with mechanical tapping, the fiber bundle is cleaned with -5°C treatment solution, the treatment solution is recovered, and then the fibers are washed to neutrality at 20°C. And dry naturally at room temperature. By comparing the dyeing performance of the fibers before and after the low temperature treatment, it is obtained that the dyeing depth K / S value of the hemp fiber after the treatment is increased by 66.1%, indicating that the dyeing performance of the hemp fiber is improved after the treatment. The initial modulus of hemp fiber after treatment decreased by 24.1%, indicating that low temperature treatmen...

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Abstract

The invention relates to a method for efficiently degumming hemp by means of peroxidating at the low temperatures under low-emission conditions. The method includes mixing alkali metal peroxide, amide substances and water with one another to obtain degumming treating fluid; carrying out degumming treatment on to-be-degummed hemp materials by the aid of the degumming treating fluid in wetting, padding or spraying modes under certain treatment conditions; carrying out first-pass cleaning on materials obtained by means of degumming treatment by the aid of the treating fluid in environments at the temperatures ranging from 5 DEG C to -20 DEG C, then cleaning the materials until the materials are neutral and drying the materials. The treatment conditions include that the to-be-degummed hemp materials are treated by 1-10 passes under the conditions of the temperatures ranging from 5 DEG C to -80 DEG C and are treated for 10s-30s in each pass. The method has the advantages that the method is high in efficiency and includes simple processes; the treating fluid can be reused, accordingly, the method is low in energy consumption, water consumption, production cost and sewage discharge, degumming byproducts can be timely collected, and transformation of the hemp spinning industry to the low-carbon environment-friendly industry can be promoted.

Description

Technical field [0001] The invention belongs to the field of degumming methods for hemp materials, and particularly relates to a method for degumming high-efficiency, low-emission and low-temperature peroxide hemp. Background technique [0002] my country is a major producer of hemp, ramie, and flax in the world, and its labor productivity ranks among the top in the world. In 2011, the unit output of flax, ramie, and hemp in my country was 3856, 1700, and 2629 kg / ha, which were much higher than the world average. As of 2012, my country has 282 hemp textile enterprises above designated size, with a total industrial output value of 43.074 billion yuan. [0003] The most time-consuming, resource-consuming, and most polluting step in the hemp fiber production process is degumming, which has begun to restrict the use and development of hemp fiber. The most commonly used degumming method is chemical degumming, also known as the two-cooking method. The process of this method is very cum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
CPCD01C1/02
Inventor 蒋秋冉葛建东陈思邱夷平韦峻峰
Owner DONGHUA UNIV
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