RECURRENTLY DISPERSED MICROFIBRILLATED CELLULOSE Russian patent published in 2019 - IPC D21H11/18 D21H17/25 D21H17/69 D21H19/10 D21H19/38 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of improving physical and / or mechanical properties of re-dispersed dried or partially dried microfibrillated cellulose, involving: a. providing an aqueous composition of microfibrillated cellulose; b. dehydration of the aqueous composition using one or more of the following: i. dehydration using belt press, ii. automatic high-pressure belt press, iii. centrifuge, iv. tubular press, v. screw press and vi. rotary press; obtaining a dehydrated microfibrillated cellulose composition; c. drying composition of dehydrated microfibrillated cellulose using one or more of the following: i. drier with fluidized bed, ii. microwave and / or radio frequency drier, iii. blown by hot air of mill or drier, section mill or multi-screw section mill and iv. sublimation drying; to obtain a dried or partially dried microfibrillated cellulose composition; wherein after re-dispersion of the dried or partially dried microfibrillated cellulose composition into the liquid medium, the microfibrillated cellulose has a breaking strength and / or viscosity, which is at least 50 % of the tensile strength and / or viscosity of the aqueous microfibrillated cellulose composition before drying at a comparable concentration, and the fiber steepness is from 20 to 50.

EFFECT: disclosed is a method of improving physical and / or mechanical properties of re-dispersed dried or partially dried microfibrillated cellulose.

18 cl, 1 dwg, 14 tbl