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

A technology of sodium sulfamate and sodium hydroxide, applied in the field of sodium hydroxide/sodium sulfamate aqueous solution solvent system for dissolving pulp cellulose, can solve the limitation of cellulose molecular weight and concentration, unstable cellulose solution and easy gelation and other problems, to achieve the effect of promoting dissolution and increasing viscosity

Inactive Publication Date: 2017-11-21
TIANJIN UNIV OF COMMERCE
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sodium hydroxide/sodium sulfamate aqueous solution solvent system for dissolving pulp cellulose
  • Sodium hydroxide/sodium sulfamate aqueous solution solvent system for dissolving pulp cellulose
  • Sodium hydroxide/sodium sulfamate aqueous solution solvent system for dissolving pulp cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Select sulfite process softwood dissolving pulp with a cellulose content of 97.3% and a degree of polymerization DP of 1520. Taking 2% pulp concentration as an example, add dissolving pulp and 7% NaOH into a transparent sample bottle, and then add 2% (based on the weight percentage of dry pulp) sodium sulfamate. 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 fiber Solubilizatio...

Embodiment 2

[0015] Example 2: 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 4% (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.

Embodiment 3

[0022] Example 3: 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.

[0023] 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.

[0024] 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.

[0025] As comparative example 3, 9.5% NaOH / 4.5% thiourea aqueous solution, no sodium sulfamate was...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
degree of polymerizationaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a sodium hydroxide / sodium sulfamate aqueous solvent system for dissolving pulp cellulose. The sodium hydroxide / sodium sulfamate aqueous solvent system for dissolving pulp cellulose is characterized in that dissolving pulp with different concentrations in percentage by weight is added to a 7% NaOH solution, and sodium sulfamate is added according to weight percentage of oven dry stock; the added amount of sodium sulfamate is controlled in a range from 2% to 8% in terms of 1 g by mass of the oven dry stock. With the adoption of the aqueous solvent system for the cellulose, dissolution of cellulose molecules with low accessibility and high polymerization degree are promoted.

Description

technical field [0001] The invention relates to a sodium hydroxide / additive aqueous solution solvent system for cellulose, in particular to a sodium hydroxide / sodium sulfamate 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 cons...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03
CPCC08J3/03C08J2301/02C08L1/02
Inventor 石岩
Owner TIANJIN UNIV OF COMMERCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap