Method of making cellulose membrane comprising microfibrillated cellulose
A technology of cellulose film and microfibrillation, applied in cellulose coating, post-treatment modification of cellulose pulp, addition of non-fibrous pulp, etc., can solve problems such as unsuitable for production, toxic release agent, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0076] Example 1 (comparison)
[0077] A film comprising microfibrillated cellulose, polyvinyl alcohol and bentonite was cast formed on a moving steel belt to obtain a wet film thickness of 740 μm, then dewatered and dried. The steel strip has a PTFE coating, a Ra roughness of 0.9 μm and a surface energy of 40-42 mN / m.
[0078] The solids content of the suspension used to make the membrane was 4.24 wt-%, containing 95.76 wt-% water, 3.69 wt-% microfibrillated cellulose, 0.37 wt-% polyvinyl alcohol and 0.18 wt-% bentonite .
[0079] The film was dried to a final solids content above 95 wt-%, and an attempt was made to separate the film from the steel strip and take it to a coiler as a free-standing film to make a continuous roll of film.
[0080] The adhesion between the film and the steel belt is so high that the film cannot be separated from the steel belt and the machine must be stopped.
Embodiment 2
[0082] The MFC film formulation as provided in Example 1 was cast formed, but now with the difference that the tape was treated with an emulsion to control adhesion to the tape.
[0083] Aqueous emulsions of rapeseed oil were prepared by using lecithin as an emulsifier. First 6 g of soy lecithin was dispersed in 100 g of rapeseed oil in a kitchen blender, then 1000 g of water was added and the emulsion was mixed until it appeared homogeneous. The emulsion was then diluted with water to achieve a final concentration of 2 wt-% rapeseed oil.
[0084] The same cast forming conditions and steel belt as in Example 1 were used, but here the emulsion was sprayed with an atomizing nozzle at a rate of 82 g / min on the top surface of the moving steel belt prior to feeding the MFC suspension to the steel belt superior. The belt is 4.8m 2 / min speed to move. 35 g / min of emulsion was taken from the belt surface with a rubber spatula that continuously wiped the belt surface to remove exce...
Embodiment 3
[0087] The MFC composition was prepared as in Example 2, but the rapeseed oil concentration in the emulsion was reduced to 0.2 wt-%.
[0088] Also, 12.5g / m 2 The dose provided successful release of the substantially dry film from the surface of the steel strip, and a continuous free-standing film could be wound. With the lower dose of rapeseed oil emulsion, the film and strip surfaces showed less residue from the emulsion.
PUM
| Property | Measurement | Unit |
|---|---|---|
| length | aaaaa | aaaaa |
| width | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More