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Method used for producing high wet modulus cellulose fiber

A technology of cellulose fibers and a process method is applied in the field of producing high-wet modulus cellulose fibers, which can solve the problems of difficulty in controlling acid bath balance, affecting the quality of yellowing gum, and difficulty in environmental protection treatment, and achieves the solution of zinc sulfate. Balance and environmental issues, improve yellowing effect, improve fiber strength

Inactive Publication Date: 2017-03-15
CHTC HELON (WEIFANG) NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The published patent CN 101591814 B "Manufacturing Method of High-Wet Modulus Fiber" proposes to use a secondary impregnation process to reduce the requirements for pulp raw materials. This process is widely used by domestic viscose fiber manufacturers. Purification of cellulose can also reduce the cost of consumption, but it cannot effectively reduce the hemicellulose produced again in the aging process after the second impregnation, which will affect the quality of the subsequent yellowing rubber production
The traditional production process of high wet modulus fiber requires low sodium sulfate, low sulfuric acid, low temperature, and high zinc sulfate "three lows and one high" spinning forming process. The concentration of sodium sulfate is generally lower than 200g / l, and the concentration of zinc sulfate is generally greater than 40 g / l, it is more difficult to control the acid bath balance, the consumption of zinc sulfate is higher, and the environmental protection treatment is difficult

Method used

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  • Method used for producing high wet modulus cellulose fiber
  • Method used for producing high wet modulus cellulose fiber
  • Method used for producing high wet modulus cellulose fiber

Examples

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Embodiment 1

[0031] Example 1 A process for producing high wet modulus cellulose fibers

[0032]Use wood pulp with a degree of polymerization of 626 and a cellulose content of 91.2%, soak and alkalize for 20 minutes at a temperature of 40°C with a NaOH solution of a concentration of 236g / l, and the concentration of hemicellulose in the soaking solution is 32g / l to generate alkali cellulose, which is squeezed After crushing, it was aged at 36°C for 3 hours to obtain an alkali cellulose with a degree of polymerization of 432, 26.2% of cellulose A, and 17.1% of NaOH. Aged alkali cellulose is impregnated twice in NaOH solution with a concentration of 175g / l at a temperature of 28°C. The second impregnation time is 22min, and the concentration of hemicellulose in the impregnating solution is 8.2g / l, and then squeezed and pulverized to obtain Type A 29.6% cellulose, alkali cellulose containing 14.6% NaOH, of which the content of hemicellulose is 2.3%. The alkali cellulose after the secondary di...

Embodiment 2

[0033] Example 2 A process for producing high wet modulus cellulose fibers

[0034] Cotton pulp with a degree of polymerization of 960 and a cellulose content of 96.3% is used to soak and alkalize for 45 minutes at a temperature of 46°C and a NaOH solution with a concentration of 252g / l. After crushing, it was aged at 45°C for 9 hours to obtain alkali cellulose with a degree of polymerization of 463, 26.9% of cellulose A and 18.6% of NaOH. Aged alkali cellulose is impregnated twice in NaOH solution with a concentration of 196g / l at a temperature of 36°C. The hemicellulose concentration of the impregnated solution is 6.2g / l for a second impregnation time of 30 minutes, and then squeezed and pulverized to obtain Type A fiber Alkali cellulose with 28.6% plain and 15.2% NaOH, of which hemicellulose content is 1.8%. The alkali cellulose after the second dipping treatment is yellowed, and the addition of carbon disulfide is 48% of the weight of the first-class cellulose. After the ...

Embodiment 3

[0035] Example 3 A process for producing high wet modulus cellulose fibers

[0036] Bamboo pulp with a degree of polymerization of 560 and a cellulose content of 90.3% is used for immersion and alkalization in NaOH solution with a concentration of 286g / l at a temperature of 36°C and a concentration of 286g / l for 50min. After crushing, it was aged at 40°C for 4 hours to obtain an alkali cellulose with a degree of polymerization of 438, 24.8% of cellulose A, and 18.3% of NaOH. Aged alkali cellulose is impregnated twice in NaOH solution with a concentration of 166g / l at a temperature of 30°C. The hemicellulose concentration of the impregnated solution is 10.8g / l for a second impregnation time of 36min, and then squeezed and pulverized to obtain Type A fiber Alkaline cellulose with 30.8% plain and 15.7% NaOH, of which hemicellulose content is 2.7%. The alkali cellulose after the second dipping treatment is yellowed, and the addition of carbon disulfide is 46% of the weight of the...

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Abstract

The invention provides a method used for producing high wet modulus cellulose fiber. The method comprises a step of secondary dipping after aging and before yellowing. Special technique is adopted, so that the method is capable of reducing generation of hemicellulose in aging, increasing the purity of alpha cellulose in yellowing, and improving yellowing effect. According to the method, zinc oxide is added before spinning, so that in solidification moulding process, generation of zinc cellulose xanthate in viscose is promoted, moulding is delayed, regenerated cellulose macromolecule crystallization and zinc ion crystal nucleus effect are inhibited, and high density small and scattered crystal regions are formed on the surface of viscose threads; and fiber strength and modulus are increased to the highest degree when adding amount of zinc oxide is controlled to be 1.2 to 2.0%.

Description

technical field [0001] The present invention relates to a kind of preparation method of regenerated cellulose fiber, specifically a kind of one kind or several mixed pulps in cotton, wood, bamboo, hemp pulp as raw material, produces high wet modulus cellulose fiber process method. Background technique [0002] Among regenerated cellulose fibers, viscose fiber is the largest and most widely used textile fiber. However, ordinary viscose fiber has low wet strength, low wet modulus, poor dimensional stability of the fabric, and serious deformation problems during wet finishing and laundering. shortcoming. High wet modulus regenerated cellulose fiber overcomes the disadvantages of ordinary viscose fiber. The fabric made of it is soft, has strong shape stability, washability, and wrinkle resistance. It can still maintain bright colors after repeated washing. It is used in high-end fashion. Favored by the majority of consumers, it has become an indispensable high-grade fabric for...

Claims

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Application Information

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IPC IPC(8): D01F2/08D01F11/02D01D13/00D01D1/02D01D10/00
CPCD01F2/08D01D1/02D01D10/00D01D13/00D01F11/02
Inventor 马君志葛红刘长军申孝忠
Owner CHTC HELON (WEIFANG) NEW MATERIALS CO LTD
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