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Method for dissolving cellulose

A cellulose solution and cellulose technology, applied in the field of cellulose dissolution and natural polymer chemistry, can solve the problems of industrialization limitation, difficulty in industrialized large-scale production, long dissolution time, etc., achieve energy saving and consumption reduction in industrialized large-scale production, easy to The effect of industrialized large-scale production and methods of green environmental protection

Inactive Publication Date: 2012-05-02
NANHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since then, a small amount of cellulose fiber products prepared with it have entered the market in the world, but due to the high price of solvents and high spinning temperature, the development of industrial production is slow.
In addition, it has been reported that cellulose and urea react at high temperature to generate cellulose carbamate, which is then directly dissolved in dilute lye to obtain spinning solution (Finnish Patent 61003; Finnish Patent 62318; U.S. Patent4404369), but the amount of urea is high, And there are by-products, which are difficult to industrialize
Some environmentally friendly methods for dissolving cellulose have also been reported at present, one of which is to dissolve cellulose in a pre-cooled solvent. It can be recycled and reused, so it is a green production process, but this method has a large energy consumption ratio. If 42 kg of cellulose is to be dissolved, nearly 1 ton of solvent needs to be pre-cooled, which is not conducive to energy saving and consumption reduction, and is difficult to be used in industrialization mass production
Kamide et al. reported that cellulose at 2.5molL -1 Dissolving in NaOH aqueous solution, but this solvent must use the wood pulp cellulose that the degree of polymerization is lower than 250 through steam explosion treatment, it can be dissolved in NaOH solution (Japan Patent1777283,1983; U.S.Patent 4634470 : Polymer J., 1984, 12, 857; Polymer J., 1988, 20, 447), and the obtained fiber filament strength is extremely low
Chinese patent 00114486.3 discloses a solvent composition for dissolving cellulose and is used for dissolving cellulose. The solvent composition can only dissolve cellulose with a smaller molecular weight (less than 8.5×10 4 ), and the dissolution time is long (more than 12 hours), and the solubility is small, so the industrialization is greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] At room temperature at 45°C, add 5g of cotton pulp or bamboo pulp, bagasse pulp, grass fiber pulp, cellulose non-woven fabric or steamed cellulose pulp to 90g of 8wt% NaOH solution and quickly Thoroughly stir for 2 hours, then add 5 g of urea to it, and stir at 45° C. for half an hour to obtain a cellulose solution. The cellulose content in the prepared cellulose solution is 5 wt%, the NaOH content is about 7.2 wt%, the urea content is 5 wt%, and the rest is water.

Embodiment 2

[0020] At a room temperature of 20°C, 6g of wood pulp, cotton pulp, hemp pulp, bamboo pulp, bagasse pulp, grass fiber pulp, cellulose non-woven fabric or steamed cellulose pulp was added to the 80 g of 12 wt % NaOH solution was quickly and fully stirred for 1 hour, then 14 g of urea was added thereto, and stirred at 20° C. for one hour to obtain a cellulose solution. The cellulose content in the prepared cellulose solution is 6 wt%, the NaOH content is about 9.6 wt%, the urea content is about 14 wt%, and the rest is water.

Embodiment 3

[0022] At room temperature of 15°C, add 2g of hemp pulp to 58g of 10wt% NaOH solution and stir rapidly for 0.5 hours, then add 40g of 18wt% urea to it, and stir for one hour at 15°C to obtain transparent fibers prime solution. The cellulose content in the prepared cellulose solution is 2 wt%, the NaOH content is about 5.8 wt%, the urea content is about 7.2 wt%, and the rest is water.

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Abstract

The invention discloses a method for dissolving cellulose, characterized by: using at least one from the group consisting of wood pulp, cotton pulp, hemp pulp, bamboo pulp, bagasse pulp, grass fibered pulp, cellulose non-woven fabric or steam exploded cellulose pulp as cellulose raw material, uniformly stirring the cellulose raw material, NaOH and water at a temperature of -15-50 DEG C to obtain a cellulose solution. The prepared cellulose concentrated solution has good spinnability and film forming property. The method breaks through a dissolution method of traditional gluing technology, does not relate to carbon disulfide and other substance causing serious environmental pollution, and is green and environmentally friendly. According to the invention, the cellulose raw material can be directly rapidly dissolved at room temperature, without heating or precooling a solvent. The method has the advantages of saving energy, and reducing energy consumption. By using raw materials having low cost, the method has the advantages of simple operation, small investment, high productivity, and is easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to a method for dissolving cellulose, which belongs to the category of natural polymer chemistry. Background technique [0002] Renewable resources, sustainable development technologies and environmentally friendly materials have become important directions for scientific and technological research and development in the 21st century. Plant cellulose is the most abundant renewable resource on the earth. It is an environmentally friendly polymer material and is expected to become one of the main chemical raw materials in the 21st century. Cellulose can be widely used in technical fields such as textile, papermaking, tobacco, food, agriculture and petrochemical industry. The cellulose used for textile and papermaking in the world reaches 8 million tons every year. But at present more than 90% regenerated cellulose products still adopt traditional viscose production, as J.Macromol.Sci.-Rev.Macromol.Chem., 1980, the method adopted i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/02C08L1/02
Inventor 喻翠云
Owner NANHUA UNIV
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