Method for producing nanofibrillar cellulose
AssigneeUpm-Kymmene Corporation
InventorsAntti Laukkanen, Markus Nuopponen
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Abstract
In a method for preparing nanofibrillar cellulose, fibrous dispersion of ionically charged cellulose is repeatedly passed through a mechanical process of disrupting fibers into fibrils until the viscosity starts to decrease. The number average diameter of the nanofibrillar cellulose after the mechanical process is in the range of 2-10 nm, and the zero-shear viscosity is below 10 Pa·s, preferably below 1 Pa·s, when measured in the concentration of 0.5 wt-%. The nanofibrillated cellulose is low aspect ratio nanofibrillated cellulose (NFC-L).
Claims34
A method for preparing nanofibrillar cellulose, comprising:
- repeatedly passing fibrous dispersion of ionically charged cellulose through a mechanical process of disrupting fibers into fibrils until viscosity of the fibrous dispersion starts to decrease, wherein after the mechanical process the nanofibrillar cellulose has a number average diameter in the range of 2-10 nm, and a zero-shear viscosity below 10 Pa·s, when measured in a nanofibrillar cellulose concentration of 0.5 wt-%.
A method of using nanofibrillar cellulose comprising:
- providing nanofibrillar cellulose having a number average diameter in the range of 2-10 nm, and a zero-shear viscosity below 1 Pa·s, when measured in a nanofibrillar cellulose concentration of 0.5 wt-%, and
- using the nanofibrillar cellulose in pickering stabilization.
Dependencies are inferred from the claim text.