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Method for producing regenerated cellulose fiber by dual-bath coagulation

A technology of regenerated cellulose and double coagulation baths, applied in the field of materials, can solve the problems of poor orientation of drafting, poor performance of regenerated cellulose fibers, insufficient curing of regenerated fibers, etc., and achieve the effect of improving uniformity and excellent mechanical properties

Inactive Publication Date: 2009-05-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for preparing regenerated cellulose fibers with double coagulation baths, which overcomes the disadvantages of poor performance of the regenerated cellulose fibers produced by the existing alkali solvent system due to limited dissolving capacity, and the disadvantages caused by the use of one coagulation bath method. Insufficient solidification of regenerated fibers and poor draft orientation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: Prepare 500 grams of a mixed solution containing 9% sodium hydroxide, 6% thiourea, 6% urea, and 79% water by weight. The solution is pre-cooled to -8°C in a refrigerator, and 32.5 grams of DP is 600 The cotton pulp was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket. Under the condition of 0°C, it was vigorously stirred by an electric mixer at a speed of 2000 rpm for 7 minutes. The weight percentage of the obtained pulp was The 6.5% solution was filtered with a 400-mesh filter under one atmospheric pressure;

[0018] Step 2: Put the filtered solution in a filter bottle at a temperature of 20°C and use a vacuum pump to degas it for 60 minutes to obtain a clear cellulose solution and transfer it to the kettle of the spinning machine;

[0019] Step 3: Pressurize the cellulose solution to 0.1Mpa through a nitrogen cylinder to make it pass through the spinning machine...

Embodiment 2

[0024] Step 1: Prepare 500 grams of a mixed solution containing 10% sodium hydroxide, 5% thiourea, 8% urea, and 77% water by weight. The solution is pre-cooled to -10°C in a refrigerator, and 50 grams of DP is 400 The cotton pulp was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket. Under the condition of 0°C, it was vigorously stirred by an electric mixer at a speed of 2000 rpm for 8 minutes. The weight percentage of the obtained pulp was The 10% solution was filtered with a 400-mesh filter under one atmospheric pressure;

[0025] Step 2: Put the filtered solution in a filter bottle at a temperature of 10°C and use a vacuum pump to vacuum and defoam for 200 minutes to obtain a clear cellulose solution and transfer it to the kettle of the spinning machine;

[0026] Step 3: Pressurize the cellulose solution to 0.1Mpa through a nitrogen cylinder to make it pass through the spinnin...

Embodiment 3

[0031] Step 1: Prepare 500 grams of mixed solution containing 8% sodium hydroxide, 4.5% thiourea, 10% urea, and 77.5% water by weight. The cotton pulp was quickly added to the pre-cooling solution, and then the temperature of the pre-cooling solution was controlled by using a circulating cooling jacket at 0°C and vigorously stirred by an electric mixer at a speed of 2000 rpm for 10 minutes. The weight percentage of the obtained pulp was The 12% solution was filtered with a 400-mesh filter under one atmospheric pressure;

[0032] Step 2: Put the filtered solution in a filter bottle at a temperature of 5°C and use a vacuum pump to vacuum and defoam for 100 minutes to obtain a clear cellulose solution and transfer it to the kettle of the spinning machine;

[0033] Step 3: Pressurize the cellulose solution to 0.1Mpa through a nitrogen cylinder to make it pass through the spinning machine metering pump, spinning gooseneck and 24 holes with a diameter of 0.1mm in the spinneret of th...

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Abstract

The invention belongs to the material field, and provides a method for preparing a regenerated cellulose fiber by double solidification bath. The method comprises the following steps: precooling cellulose to a temperature of between 8 DEG C below zero and 12 DEG C below zero in a mixed solution which contains the following compositions in weight percentage: 7 to 10 percent of sodium hydroxide, 4.5 to 7 percent of thiourea, 1 to 10 percent of urea, and 73 to 87.5 percent of water to prepare a cellulose solution with concentration of between 2 and 12 percent through filtering and defoaming; spinning the cellulose solution through a spinning machine, and presolidifying and predrafting the cellulose solution in a first solidifying bath; sufficiently solidifying, regenerating, drafting and orientating the cellulose in a second solidifying bath; washing and drying cellulose; and finally, oiling the fiber through a prepared composite oil solution, and winding the fiber to obtain the regenerated cellulose fiber with excellent mechanical performance.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing regenerated cellulose fibers in double coagulation baths. Background technique [0002] With the depletion of petroleum resources, seeking cheap and clean renewable energy has become an important research task in the energy field of various countries. The utilization and conversion of cellulosic substances is of great significance to solve the problems of world environmental pollution and energy crisis. Cellulose is the most abundant renewable polymer in nature. It has good biocompatibility, biodegradability and many other excellent properties. It can be used to prepare a variety of functional cellulose products, and can also be prepared by derivatization reactions. Various cellulose derivatives can partially replace petroleum resources and have broad application prospects. The molecular structure of cellulose contains a large number of hydroxyl groups, which are e...

Claims

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Application Information

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IPC IPC(8): D01D5/06D01D1/02D01D10/06D01D11/00D02J1/22D01F2/02D01F11/02D06M13/203D06M15/643D06M101/06
Inventor 俞建勇李发学张帅付昌飞顾利霞
Owner DONGHUA UNIV
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