Method of producing and the use of microfibrillated paper

a micro-fibrous paper and paper technology, applied in papermaking, non-fibrous pulp addition, cellulose treatment using microorganisms/enzymes, etc., can solve the problems of low cost constituent, high modulus and strength of materials, and brittleness of materials based on melamine-formaldehyde,

Inactive Publication Date: 2010-03-18
SWETREE TECHOLOGIES AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]The well dispersed nanofibrils leads to an extremely strong paper and the thickness of the paper in one embodiment is 40 μm or less.
[0027]Another embodiment is that the paper exhibits a tensile strength of at least 250 MPa. The paper may contain a porosity of at least 15%.

Problems solved by technology

This disadvantage is balanced by its availability as a low cost constituent obtainable from renewable resources.
The materials show high modulus and strength, but are quite brittle.
Materials based on melamine-formaldehyde show similar brittleness.
However, the effect of nanostructure change on the mechanical properties of bacterial cellulose / polysaccharide nanocomposite has not been investigated in great detail so far.

Method used

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  • Method of producing and the use of microfibrillated paper
  • Method of producing and the use of microfibrillated paper
  • Method of producing and the use of microfibrillated paper

Examples

Experimental program
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example 1

Preparation of MFC

[0049]The different kinds of microfibrillated cellulose (MFC) used herein are termed DP-X where X corresponds to the average degree of polymerization (DP) of the specific MFC sample, estimated from viscosity data.

[0050]Oxidation and formation of charged groups on the cellulose fibrils may for example be conducted on cellulose (2 g) suspended in water (150 ml) containing TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) (0.025 g) and sodium bromide (0.25 g). The pH was adjusted by adding NaClO and was then maintained at 10.5. To terminate the reaction the pH was lowered through addition of HCl to a pH of around 7. The whole procedure was performed at room temperature. The product was thoroughly washed with water.

[0051]The MFC was prepared from softwood dissolving pulp kindly provided by Domsjö Fabriker A B, Sweden. The pulp was subjected to a pre-treatment step followed by disintegration into MFC by a homogenization process with a Microfluidizer M-110EH, Microfluidics In...

example 2

Preparation of Porous Cellulose Nanopaper

[0055]Cellulose nanopaper films were prepared by vacuum-filtration of a 0.2% (by weight) MFC suspension. Prior to filtration the suspension was stirred for 48 h to ensure well dispersed nanofibrils. All films, except DP-800, were filtrated on a glass filter funnel (11.5 cm in diameter) using Munktell filter paper, grade OOH, Munktell Filter A B, Sweden. Films prepared of DP-800 were filtrated on a glass filter funnel (7.2 cm in diameter) using filter membrane, 0.65 μm DVPP, Millipore, USA. After filtration, the wet films were stacked between filter papers and then dried at 55° C. for 48 h at about 10 kPa applied pressure. This resulted in MFC films with thicknesses in the range 60-80 μm.

[0056]Porous films are prepared by solvent exchange on the filtered film before drying. After filtration the wet film was immersed in methanol, ethanol or acetone for 2 h. The solvent was replaced by fresh solvent and the film was left for another 24 h. Then t...

example 3

Preparation of Cellulose Nanopaper Using Bacterial Nanofibrils

[0058]The Acetobacter aceti strain was pre-cultivated in the Hestrin-Schramm (HS) medium for 7 days at 27° C., and 5 mL of this pre-culture was used to inoculate 30 mL of fresh HS medium. A series of BCHEC samples were prepared in the presence of 0.5, 1.0, 2.0, and 4.0% (w / v) HEC (Aldrich cat # 308633; average Mw 250,000) in the culture medium. The control BC was obtained by cultivating the bacterium in the absence of HEC in the medium. The control BC and BCHEC fleeces were harvested after 7 days of culture at 27° C. under static conditions. They were treated with 0.1 M NaOH at 80° C. for 3 h and washed with de-ionized water. This process was repeated 3 times and the BC fleeces were finally washed with de-ionized water for several days until neutrality was reached. Aqueous suspensions of BC microfibrils with a solid content of 0.2% were obtained by homogenizing the control BC or the BCHEC fleeces with a Waring® blender. T...

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Abstract

The present invention relates to a method of producing a cellulose based paper, the paper itself and the use thereof where the paper exhibits enhanced mechanical properties. The method involves providing a suspension of well dispersed modified cellulose at a low concentration. The properties and the chemical structure of the paper make it suitable for in vivo applications such as implant material.

Description

FIELD OF TECHNOLOGY[0001]The present invention relates to a microfibrillated cellulose structure for increased toughness of paper and a method of producing the paper.BACKGROUND[0002]The term “microfibrillated cellulose” refers to nanofibrils obtained from plant fibres (plant cells) by mechanical or chemical means, often a combination of chemical pre-treatment and mechanical disintegration, or from bacterial produced fibres. Such “microfibrillated cellulose” has a diameter typically less than 40 nm and is several micrometers in length and is termed nanofibrils in the following. Cellulose is the main reinforcing constituent in plant cell walls. It is present in the form of aligned β(1,4)-D-glucan molecules in extended chain conformation assembled into nanofibrils of high modulus and tensile strength. Often, cellulose materials are based on plant cells, for instance in the form of wood pulp, but it can also be derived from bacteria. Despite good inherent properties of cellulose, the us...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/22D21C9/00D21H17/24D21H17/25
CPCD21C5/005D21C9/002D21H11/20D21H11/18D21C9/007
Inventor HENRIKSSON, MARIELLEBERGLUND, LARSZHOU, QIBULONE, VINCENT
Owner SWETREE TECHOLOGIES AB
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