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Sodium hydroxide/sodium cyclamate aqueous solution solvent system for dissolving pulp cellulose

A technology of sodium cyclohexyl sulfamate and sodium sulfamate is applied in the field of sodium hydroxide/sodium cyclohexyl sulfamate aqueous solution solvent system, which can solve the limitation of molecular weight and concentration of cellulose, unstable and easy coagulation of cellulose solution glue and other problems to achieve the effect of promoting dissolution and increasing viscosity

Inactive Publication Date: 2017-11-21
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this system has certain restrictions on the molecular weight and concentration of soluble cellulose, and the dissolved cellulose solution is unstable and easy to gel, and there is still a long way to go before the industrialization of film formation.

Method used

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  • Sodium hydroxide/sodium cyclamate aqueous solution solvent system for dissolving pulp cellulose
  • Sodium hydroxide/sodium cyclamate aqueous solution solvent system for dissolving pulp cellulose
  • Sodium hydroxide/sodium cyclamate aqueous solution solvent system for dissolving pulp cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Acidic sulfite processed softwood dissolving pulp with a cellulose content of 97.3% and a degree of polymerization DP of 1520 was selected. Taking 2% pulp concentration as an example, add dissolving pulp and 7% NaOH into a transparent sample bottle, and then add 20% (based on the weight percentage of dry pulp) sodium cyclamate. Stir fully, disperse and swell, store in the refrigerator at low temperature (-12°C) for 2 hours, thaw and stir to obtain the dissolving pulp cellulose dissolution system, then centrifuge, extract the upper transparent cellulose solution and measure it with a 0.9-1.0 Ubbelohde viscometer Its viscosity, the size of the viscosity is expressed by the relative time passed. The undissolved part was filtered through an alkali-resistant sand core funnel, washed to neutrality, transferred to a plastic watch glass, and pressed with 2 coverslips in a wet state, and weighed after air-drying at room temperature to calculate the dissolved pulp fibe...

Embodiment 2

[0021] Example 2: Select pre-hydrolyzed kraft softwood dissolving pulp with a cellulose content greater than or equal to 93.55% and a degree of polymerization DP of 1190. Taking 2% pulp concentration as an example, add dissolving pulp and 7% NaOH into a transparent sample bottle, and then add 8% (based on the weight percentage of dry pulp) sodium sulfamate. Others were the same as in Example 1 to observe the dissolving effect of dissolving pulp cellulose.

[0022] Comparative example 1: only use 7% NaOH aqueous solution, do not add sodium sulfamate, other are carried out the observation of dissolving pulp cellulose dissolving effect identically with embodiment 1.

[0023] As comparative example 2, only with 7%NaOH / 12% urea aqueous solution, do not add sodium sulfamate, other carry out the observation of dissolving pulp cellulose dissolving effect identically with embodiment 1.

[0024] As comparative example 3, 9.5% NaOH / 4.5% thiourea aqueous solution, no sodium sulfamate was...

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Abstract

The invention discloses a sodium hydroxide / sodium cyclamate aqueous solvent system for dissolving pulp cellulose. According to the sodium hydroxide / sodium cyclamate aqueous solvent system for dissolving pulp cellulose, dissolving pulp with different weight percentage concentrations is added to a 7% NaOH solution, and sodium cyclamate is added according to weight percentage of absolute dry pulp; in terms of 1 g by mass of the absolute dry pulp, the addition amount of sodium cyclamate is controlled in a range from 16% to 20%. With the adoption of the cellulose aqueous solvent system, dissolving of high-polymerization-degree cellulose molecules with low accessibility in cellulose molecules is promoted.

Description

technical field [0001] The invention relates to a sodium hydroxide / additive aqueous solution solvent system of cellulose, in particular to a sodium hydroxide / sodium cyclamate aqueous solution solvent system for dissolving pulp cellulose. Background technique [0002] With the increasing shortage of petroleum resources and the increasing environmental pollution of synthetic polymer materials based on petroleum, as the most abundant natural polymer cellulose on the earth, people pay more and more attention to it. At present, the key problem hindering the wide application of cellulose is to find an industrially feasible solvent system that is environmentally friendly and can dissolve cellulose well. There are two types of solvents for dissolving cellulose: aqueous solvents and non-aqueous solvents. Due to some reasons such as environmental pollution caused by solvent recovery, N-methylmorpholine-N-oxide (NMMO), ionic liquid and sodium hydroxide aqueous solvent system are consi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C08L1/02
CPCC08J3/03C08J2301/02C08L1/02
Inventor 石岩
Owner TIANJIN UNIV OF COMMERCE
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