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Method for manufacturing modal fiber

A modal fiber and manufacturing method technology, applied in the direction of rayon made of viscose, etc., can solve the problems of high hemicellulose, increasing the cost and difficulty of pulp, affecting viscose manufacturing and spinning, etc.

Active Publication Date: 2009-09-30
杭州奥通新材料智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in cellulose pulp with low A-cellulose content < 95%, there are many impurities such as hemicellulose, if not effectively removed, it will affect the production and spinning of viscose, making it difficult to produce modal fibers
For example, the Chinese patent application "High Wet Modulus Viscose Fiber and Its Preparation Method" of Publication No. CN101024907 discloses a method for preparing high wet modulus viscose fiber, but its production process has strict requirements on raw materials, requiring pulp Type A cellulose content ≥ 95%, this kind of pulp needs special processing, which increases the cost and difficulty of pulp manufacturing, especially wood pulp, which greatly increases the cost of raw materials for fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The lignocellulosic pulp with a cellulose content of 92% is used for a dipping and alkalization through 230g / l NaOH solution. The concentration of the pulp porridge is 4.5%, and the dipping temperature is 50°C. The amount of 0.1% viscose auxiliary agent - fatty alcohol ether (code name EBZ), the first dipping time is 1.5 hours. After pressing and pulverizing, it is secondarily dipped and alkalized in 160g / l NaOH solution, the concentration of the porridge is 4.0%, the dipping temperature is 42°C, and the second dipping time is 1 hour, so that the hemicellulose in the dipping alkali solution is dissolved. Its content 2 After yellowing reaction for 45 minutes, cellulose xanthate was generated. After yellowing, 30 g / l NaOH solution was added to dissolve at 5°C. It is 6.5% to obtain the first cellulose content, the cellulose viscose of NaOH5.0%, in the dissolving process of cellulose xanthate, add the viscose denaturant---nitrogen compound equivalent to 1.0% of the first ce...

Embodiment 2

[0036] It is 89% lignocellulosic pulp and 94% cotton pulp (each 50%) to carry out dipping alkalization through the NaOH solution of 240g / L by adopting the first kind of cellulose content, and the concentration of pulp porridge is 4.8%, and dipping temperature is 52°C, the immersion time is 1 hour, and a viscose auxiliary agent with a p-methylcellulose content of 0.1%—fatty alcohol ether (code name EBZ) is added when crushing. After pressing and crushing, it is secondarily impregnated and alkalized by 170g / l NaOH solution. The concentration of the porridge is 4.5%. 25g / l. Alkali cellulose with a compression ratio of 3.0 was obtained after crushing again. Alkali cellulose was aged at 25° C. for 5 hours to obtain alkali cellulose with cupro ammonia viscosity of 90 mps. Mix 7800kg alkali cellulose with 810 liters of CS 2 Yellowing reaction for 1 hour produces cellulose xanthate. After the yellowing is over, add 40g / L NaOH solution to dissolve at 7°C to obtain a viscose solution...

Embodiment 3

[0038] Cotton pulp with a methylcellulose content of 94.5% is dipped and alkalized by 235g / l NaOH solution once, the concentration of the porridge is 3.8%, and the dipping temperature is 52°C. Glue additive - fatty alcohol ether (code name EBZ). The immersion time is 2.5 hours, so that the hemicellulose in the immersion lye is dissolved, and its content is less than 30g / l. Alkali cellulose with a pressing ratio of 3.2 was obtained after pressing and crushing. Alkali cellulose was aged at 35° C. for 2.5 hours to obtain alkali cellulose with cupro ammonia viscosity of 80 mps. Mix 8000kg alkali cellulose with 840 liters CS 2 Yellowing reaction 55min, generate cellulose xanthate, after yellowing finishes, add 48g / lNaOH dilute lye and dissolve at 8 ℃, obtain the cellulose viscose glue that the first kind of cellulose content is 7.0%, NaOH6.5%. During the dissolving process of cellulose xanthate, 2.0% viscose denaturant——the alkylene oxide adduct of nitrogen compound (code name E...

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Abstract

The invention discloses a method for manufacturing modal fiber, which comprises basification reaction, ageing reaction, yellowing reaction, dissolution of viscose glue, filter of the viscose glue, defoaming of the viscose glue, ripening of the viscose glue, wet spinning, drawing and other related process steps. The method adopts cellulose pulp with alpha cellulose content of less than 95 percent as a raw material, uses common equipment for producing common viscose glue short fiber, and adopts the technology to control a simple and practical special process formulation and a spinning drawing mode to manufacture the modal fiber capable of reaching international standards. The method has the advantages of little investment, easily obtained and low-cost raw materials, high productivity and simple process operation; and the manufactured modal fiber has good quality and stable performance.

Description

Technical field: [0001] The invention relates to a method for producing regenerated cellulose, especially modal fiber. [0002] In this note, Modal fibers are defined in the International Standard ISO 2076:1999(E) as high wet modulus, high breaking strength regenerated cellulose fibers made from specific viscose and regeneration bath compositions, in which A higher degree of molecular orientation can be achieved when the fibers are stretched and coagulated. Background technique: [0003] The luster, softness, hygroscopicity, dyeability and color fastness of Modal fiber are all superior to those of pure cotton products; the fabric made of it shows a kind of silk luster, has a pleasant soft touch feeling and drape feeling and extremely Good durability. [0004] According to the definition of BISFA: Modal fiber is regenerated cellulose with high strength and high wet modulus obtained through processing, its wet breaking strength is above 2.20CN / dtex, and its wet breaking elon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/06
Inventor 冉国庆郑睿敏李文峰
Owner 杭州奥通新材料智能科技有限公司
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