Nano cellulose homogeneous colloid mill

Nanocellulose is a type of cellulose crystal that has at least one dimension at the nanoscale (1-100nm) and can be dispersed in water to form a stable suspension. Due to different preparation methods, nanocellulose with different properties may be obtained. Nanocellulose not only possesses the basic structure and properties of natural cellulose, such as sustainable regeneration and biodegradability, but also has some characteristics of nanoparticles, such as high chemical reactivity, high polymerization degree, high crystallinity, high purity, and high transparency, making it widely used. But there are also shortcomings: ① The numerous hydroxyl groups on the surface of nanocellulose determine that it cannot dissolve well in weakly polar solvents and polymer media; ② Nanocellulose has a large specific surface area, high thermodynamic potential energy, and is prone to aggregation between crystals. Therefore, it is necessary to modify nanocellulose to further broaden its application fields.The emulsifier disperser adopts a German Bergmann double end mechanical seal, which can operate continuously for 24 hours while ensuring cooling water. However, it is difficult for ordinary emulsifiers to operate continuously for a long time, and ordinary emulsifiers cannot withstand high-speed operation. It can handle large amounts, operate more smoothly, and is more convenient, suitable for industrial online continuous production. The particle size distribution range is narrow, the dispersion effect is good, and there are no dead corners. The material * * * is dispersed and sheared.

A method for preparing nanocellulose, comprising:

(1) Add cellulose raw material to the molten solution of acid anhydride compounds, raise the temperature above the melting point, perform pretreatment reaction, filter after the reaction is complete, and obtain the pretreated cellulose raw material;

(2) Disperse the pre treated cellulose raw material into water to obtain a dispersion solution;

(3) Mechanically crush the dispersion to obtain a nanocellulose dispersion.

Cellulose is formed by the step-by-step bonding of elementary unit fibers through their own * bonds, lignin, etc. The elementary unit fibers are composed of dozens of cellulose molecules aggregated to form a small fiber filament with a diameter of about 5nm, a length of micrometer level, and alternating crystalline and amorphous regions. The present invention mixes cellulose raw materials with anhydride in a molten state, and the anhydride enters between the elementary unit fibers, grafts onto the surface of the elementary unit fibers, weakens the bonding between the elementary unit fibers, and then mechanically peels off the elementary unit fibers with mechanical force to obtain nanocellulose fibers. Anhydrides can enter between the elementary unit fibers without damaging the amorphous region inside the elementary unit fibers like concentrated acid solutions, and without reducing the grafting rate of cellulose like dilute acid solutions, which cannot obtain nanocellulose.

High speed shear homogenizer is mainly used to process a large number of ultra-fine suspended lotion. Due to the simultaneous use of three homogeneous heads (rotor and stator) for processing, a very narrow particle size distribution can be obtained, resulting in smaller droplets and particles, and thus better stability of the generated mixture. The dispersing head is easy to replace and suitable for various applications. Different machines have the same rotational speed and shear rate, which facilitates scale expansion. Compliant with CIP and SIP cleaning standards, therefore particularly suitable for food and pharmaceutical production

High rotational speed and shear rate are crucial for obtaining ultrafine suspensions. According to some industry specific requirements, Xide Company has developed the XRS2000 ultra high speed shear homogenizer on the basis of the XR2000 series. Its shear rate can exceed 13000 rpm, and the rotor speed can reach 40m/s. Within this speed range, turbulence caused by shear forces combined with specially developed motors can reduce the particle size range to the nanometer level. The shear force is stronger, and the particle size distribution of lotion is narrower. Due to its extremely high energy density, no other auxiliary dispersing equipment is required.

Grinding and dispersing machine is a high-tech product composed of colloid grinding and dispersing machines.

The first level consists of three-level sawtooth protrusions and grooves with increasing precision. The stator can be infinitely adjusted to the desired distance between the rotors. Under enhanced fluid turbulence. The groove can change direction at each level.
The second stage is composed of a stator. The design of the dispersing head also effectively meets the needs of substances with different viscosities and particle sizes. The difference in the design of the stator and rotor (emulsifying head) between online and batch machines is mainly due to the requirements for conveying performance. It is particularly important to note that the difference between coarse precision, medium precision, fine precision, and other types of working heads is not only the arrangement of specified rotor teeth, but also an important difference in the geometric characteristics of different working heads. The width of the slot and other geometric features can alter the different functions of the stator and rotor working heads.

The following is a model table for reference:

Nano cellulose homogeneous colloid mill