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Hemp degumming and softening synchronous treatment process

A simultaneous processing and degumming technology, applied in the direction of producing bast fiber by chemical method

Inactive Publication Date: 2012-01-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above processes can organically combine the degumming process of hemp and the smoothing treatment process of hemp, so that the smoothing process and the degumming process are carried out simultaneously, so as to further simplify the process flow, reduce process costs, save energy, and reduce pollution. It is also a practical problem that needs to be solved urgently

Method used

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  • Hemp degumming and softening synchronous treatment process
  • Hemp degumming and softening synchronous treatment process
  • Hemp degumming and softening synchronous treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] Implement a kind of hemp fiber degumming treatment process and supple treatment process of the present invention, its process step is as follows:

[0030] (1) The epidermis of the hemp stalk was stirred by pre-water at 70°C for 60 minutes, alternately stirred clockwise / counterclockwise every 20 minutes, and the bath ratio of fiber to deionized water was 1:12. Water treatment cleans the dust, dust and other impurities on the surface of the fiber, and can also soften the fiber;

[0031] (2) Put the fibers treated in the water bath into the ultrasonic processor and vibrate for 15 minutes. Ultrasound makes the fibers soft and initially sheds the glue;

[0032] (3) Pre-acidify the fiber after pre-water treatment at 50°C for 20 minutes, the mixed solution is 0.7g / L sulfuric acid, 0.5g / L acetic acid, 1.0g / L sodium nitrate, 1.0g / L sodium hypochlorite, Agitate cis / reverse alternately for 20 minutes, and the bath ratio of fiber to solution is 1:12. Acid treatment can chemicall...

Embodiment approach 2

[0041] According to the process method of embodiment 1, the difference of embodiment 2 is:

[0042] (1) The epidermis of the hemp stalk was stirred by pre-water at 75°C for 70 minutes, and alternately stirred clockwise / counterclockwise every 25 minutes;

[0043] (2) The shock processing time in the ultrasonic processor is 20 minutes;

[0044] (3) Wash the fiber after ultrasonic treatment with deionized water, and soak it in a mixed solution composed of 0.8g / L sulfuric acid, 0.6g / L acetic acid, and 1.2g / L sodium hypochlorite at a temperature of 55°C. / Stir alternately for 25min;

[0045] (4) When irradiated under ultraviolet light, the concentration of hydrogen peroxide is 0.35mol / L, the concentration of sodium hydroxide is 0.3mol / L, the concentration of sodium silicate is 0.003mol / L, and the concentration of magnesium sulfate is 0.02mol / L. The concentration of sodium polyphosphate is 0.005mol / L, the wavelength of ultraviolet light is 300nm, and the radiation time is 40 minut...

Embodiment approach 3

[0050] According to the process method of embodiment 1, the difference of embodiment 3 is:

[0051] (1) The epidermis of the hemp stalk was stirred by pre-water at 80°C for 80 minutes, and alternately stirred clockwise / counterclockwise every 30 minutes;

[0052] (2) The shock processing time in the ultrasonic processor is 20 minutes;

[0053] (3) Wash the fiber after ultrasonic treatment with deionized water, and soak it in a mixed solution composed of 1.0g / L sulfuric acid, 0.7g / L acetic acid, and 1.4g / L sodium hypochlorite at a temperature of 60°C. / Stir alternately for 30min;

[0054] (4) When irradiated under ultraviolet light, the concentration of hydrogen peroxide is 0.4mol / L, the concentration of sodium hydroxide is 0.35mol / L, the concentration of sodium silicate is 0.005mol / L, and the concentration of magnesium sulfate is 0.03mol / L. The concentration of sodium polyphosphate is 0.010mol / L, the wavelength of ultraviolet light is 350nm, and the irradiation time is 50 min...

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Abstract

The invention provides a hemp degumming and softening synchronous treatment process. The hemp degumming and softening synchronous treatment process comprises the following steps of: after dipping, stirring and ultrasonically treating hemp fiber in a solution with bath ratio of 1:12, washing the hemp fiber; next, dipping the washed hemp in a mixed solution again, radiating the hemp by using ultraviolet rays, and adding a cooking additive to the hemp and mixing the mixture; repeating the steps and adding a softening agent; and finally, adding the cooking additive to the treated hemp fiber and then dipping the hemp fiber in a constant temperature water bath to be cooked; meanwhile, adding the softening agent to the hemp fiber, and stirring, washing, scotching, oiling, deoiling and drying thehemp fiber so as to obtain the synchronously degummed and softened hemp. According to the invention, the softening agent is added to the hemp during cooking and then the hemp is dipped and stirred sothat the softening is synchronously carried out; the alkali boiled hemp fiber is placed under strong ultraviolet rays to be radiated again so that the cracks on the surface of the fiber are increased; and the softening agent immediately enters the interior to be grafted and better bonding effect of the softening agent is obtained under the radiation of a coupling agent, a surfactant and ultraviolet rays so as to realize synchronous degumming and softening treatment of the hemp fiber.

Description

technical field [0001] The invention is related to the degumming and softening treatment process of hemp (big) hemp, in particular a treatment process in which ultraviolet radiation and freezing treatment are introduced into the degumming and softening treatment process. Background technique [0002] The cellulose of Chinese (hemp) fiber is connected by glucose groups through glycosidic bonds to form molecular clusters, and then constitutes a fibril system filled with colloid. Hemp has high lignin content and complex structure, which is cross-linked into a complex amorphous network structure, which increases the difficulty of removal. The presence of lignin directly affects the flexibility and eating performance of hemp fiber. According to research, when the lignin content is higher than 1.5%, the hemp fiber feels rough and hard, the color turns yellow, and basically does not have spinnability. And when the lignin content is lower than 0.8%, the fiber feels soft and elasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 魏丽乔王亓杰张城云王灿灿张书才许并社
Owner TAIYUAN UNIV OF TECH
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