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Cellulose dissolving agent and application thereof

A cellulose dissolving and regenerated cellulose technology, applied in the direction of single-component cellulose artificial filament, fiber chemical characteristics, spinning solution preparation, etc., can solve the complex dissolution process, high energy consumption, high viscosity and high elasticity of the solution, etc. problems, to achieve the effects of wide adjustable range, shortened process flow, and high solubility

Active Publication Date: 2014-09-17
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has some disadvantages in the production process: 1) The solvent is expensive, and the upward trend is obvious; 2) The solvent NMMO contains nitrogen-oxygen bonds, which is easy to cause the degradation of cellulose; 3) The dissolution process is complicated and consumes a lot of energy; 4) The concentration that can achieve a uniform solution is limited, and the production cost and efficiency are limited; 5) Due to the high spinning temperature, solvent recovery is difficult, resulting in slow industrial production
However, ionic liquids have disadvantages as cellulose solvents: 1) when the cellulose concentration is high, the solution will appear in a high-viscosity and high-elastic state, which will cause great difficulties in processing; 2) when pure imidazole-type ionic liquids are used to dissolve cellulose, When the temperature reaches or exceeds 140°C, it is easy to cause the degradation of cellulose

Method used

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  • Cellulose dissolving agent and application thereof
  • Cellulose dissolving agent and application thereof
  • Cellulose dissolving agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add the pulverized wood pulp fibers (DP value of 1050) to 1-butyl-3-methylimidazolium chloride (【BMIM】Cl) without / adding alkyl quaternary ammonium salt ion solution respectively and dimethyl sulfoxide composition. The ratio of crushed wood pulp fiber to dissolving agent is 3:50.

[0028] The specific data are shown in Table 1:

[0029] Table 1 The effect of alkyl quaternary ammonium salt ion solution on the dissolution rate of wood pulp fiber

[0030]

[0031]

[0032] The experimental results are as follows:

[0033] 1, do not add the wood pulp fiber of alkyl quaternary ammonium salt ion solution, dissolve at 90 ℃ according to prior art record, form uniform, stable, transparent spinning solution through 5 hours, the concentration of spinning solution is 6%. The spinning liquid is filtered and defoamed, then wet-spun, the coagulation bath is water, and the temperature is 20°C. The drawing ratio during spinning is 2, and the cellulose fibers with a strength of ...

Embodiment 2

[0037] Add the pulverized cotton linters (DP value of 850) to 1-butyl-3-methylimidazolium acetate (【BMIM】Ac) without / adding alkyl quaternary ammonium salt ion solution respectively. and dimethyl sulfoxide composition. The ratio of crushed wood pulp fiber to dissolving agent is 1:25. The specific data are shown in Table 2:

[0038] The impact of table 2 alkyl quaternary ammonium salt ion solution on the dissolution rate of cotton linters

[0039]

[0040]

[0041] The experimental results are as follows:

[0042]1, do not add the linter of alkyl quaternary ammonium salt ion solution, dissolve at 90 ℃ according to prior art record, form uniform, stable, transparent spinning solution through 4.5 hours, the concentration of spinning solution is 4%. The spinning liquid is filtered and defoamed, then wet-spun, the coagulation bath is water, and the temperature is 20°C. The drawing ratio during spinning is 2, and the cellulose fibers with a strength of 6 cN / dtex are obtaine...

Embodiment 3

[0046] Add the pulverized microcrystalline cellulose (DP value of 220) to 1-butyl-3-methylimidazolium acetate ([BMIM] Ac ) and dimethyl sulfoxide composition. The ratio of crushed wood pulp fiber to dissolving agent is 1:5. The specific data are shown in Table 3:

[0047] The impact of table 3 alkyl quaternary ammonium salt ion solution on the dissolution rate of microcrystalline cellulose

[0048]

[0049] The experimental results are as follows:

[0050] 1. Microcrystalline cellulose without adding alkyl quaternary ammonium salt ion solution, according to prior art records, dissolves at 90°C, and forms a uniform, stable and transparent spinning solution after 4.5 hours, and the concentration of the spinning solution is 20% . The spinning liquid is filtered and defoamed, then wet-spun, the coagulation bath is water, and the temperature is 20°C. The drawing ratio during spinning is 2, and the cellulose fibers with a strength of 2.8cN / dtex are obtained through washing a...

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Abstract

The invention provides a cellulose dissolving agent and application thereof. The cellulose dissolving agent is a mixture of an ionic liquid and an organic solvent; cations in the ionic liquid are alkyl imidazole ions and alkyl quaternary ammonium ions; anions in the ionic liquid are one or more than two selected from Cl<->, CH3COO<->, CF3COO<->, CF3SO3<->, BF4<->, (CF3SO2)3C<->, PF6<-> and (CF3SO2)2N<->; the organic solvent is one or more than two selected from N,N-dimethyl formamide, N,N-dimethylacetamide, N-methyl pyrrolidone and dimethyl sulfoxide. The cellulose dissolving agent provided by the invention can directly and rapidly dissolve natural cellulose and regenerated cellulose and have high solubility.

Description

technical field [0001] The invention relates to the field of cellulose regeneration, in particular to a cellulose dissolving agent and its application. Background technique [0002] With the prominent problem of environmental pollution and the depletion of oil and other resources, the rational and effective use of natural resources has become the focus of attention. [0003] Regenerated cellulose fiber (Regenerated Cellulose Fiber) is a regenerated fiber made of cellulose with a structure of cellulose II. Due to the reduction of cultivated land and the depletion of oil resources, the output of natural fibers and synthetic fibers will be more and more restricted; while people pay attention to the environmental protection performance in the process of textile consumption, the value of regenerated cellulose fibers has been reconsidered. Know and discover. Now the application of regenerated cellulose fiber has obtained an unprecedented development opportunity. [0004] Cellul...

Claims

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Application Information

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IPC IPC(8): D01F2/00D01D1/02D01D5/06
Inventor 张力平孙海波苗娇娇于永启
Owner BEIJING FORESTRY UNIVERSITY
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