PVDF membrane disperser

PVDF membrane disperser

PVDF polyvinylidene fluoride has a semi transparent or white powder or particle appearance, with tightly arranged molecular chains and strong hydrogen bonds. It has an oxygen index of 46%, is non flammable, a crystallinity of 65%~78%, a density of 1.77~1.80g/cm3, a melting point of 172 ℃, a heat deformation temperature of 112~145 ℃, and a long-term use temperature of -40~150 ℃.Mainly refers to fluorine biasPVDF molecular formulaEthylene homopolymer or copolymer of vinylidene fluoride with other small amounts of fluorinated monomers, which combines the characteristics of fluororesin and general-purpose resin. In addition to good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectric properties, and thermoelectric propertiesfluoroplasticThe second largest product in terms of production volume, with a global annual production capacity of over 53000 tons.

diaphragm material

The applications of PVDF in lithium batteries include adhesives and separator materials. The currently popular technology is diaphragm coating, and we mainly know of two types: PVDF coating and sleeve coating. The difference between these two types of membrane coatings is that if PVDF is used as the coating, its main function is to use the electrode and membrane as the bonding layer. The advantage of bonding is that the battery will be harder and stronger, which has great advantages in production and transportation. Nowadays, batteries are becoming thinner and PVDF can also be used as the bonding layer. Another advantage of the bonding layer is that it can absorb liquid. So, PVDF coating is now widely used in smartphones. Ceramic coatings are mainly used in power vehicles, but their application in smartphones is also gradually expanding because the voltage inside smartphones is also increasing, requiring safer coatings.

For the current membrane coating technology, ceramic coating is water-based, but PVDF is still more mature in oil-based technology. The so-called oil-based technology is acetone, and the material used for acetone also has some disadvantages, such as flammability and explosiveness. Its use must be more strict, and environmental protection departments will also control its use. Therefore, some of our clients prefer to use water-based materials, so in our next research and development, we will use more water-based technology to reduce or avoid the use of acetone.

PVDF applications are mainly concentrated in three major fields: petrochemicals, electronics and electrical, and fluorocarbon coatings. Due to its excellent chemical resistance, processability, fatigue resistance, and creep resistance, PVDF is one of the materials used for pumps, valves, pipelines, pipeline fittings, storage tanks, and heat exchangers in the overall or lined fluid treatment systems of petrochemical equipment.

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SGN disperser is an efficient, fast, and uniform method for dispersing one or more phases(Liquid, solid)Entering into another immiscible continuous phase(Usually liquid)The equipment of the process. When the fineness of one or more materials reaches the micrometer or even nanometer level, the system can be considered homogeneous. When external energy is input, the two materials recombine into a homogeneous phase.

PVDF membrane disperser

Introduction to dispersion effect:Dispersion is a thermodynamically unstable system composed of at least two incompatible liquids. One liquid is dispersed in spherical units in another liquid, so the more stable the dispersion, the better the dispersion effect.

From the perspective of equipment, there are several factors that affect the dispersion effect, including:

1.The forms of dispersed heads (batch and continuous) (continuous is better than batch)

2.The shear rate of the dispersing head, the larger the effect, the better

3.The tooth structure of the dispersing head (divided into initial teeth, middle teeth, fine teeth, ultra-fine teeth, and finer teeth for better effect)

4.The residence time and dispersion time of materials on dispersed walls (can be regarded as equivalent motors, the smaller the flow rate, the better the effect)

5.The more cycles (the better the effect, and by the end of the device's lifespan, it cannot be any better)

Calculation of linear velocity:

The definition of shear rate is the relative velocity of the liquid layer between two surfaces.

Shear rate (s-1)=v rate(m/s)
gfixed-Rotor spacing(m)

As can be seen from the above, the shear rate depends on the following factors:

Linear velocity of rotor

In this case, the distance between the two surfaces is the rotor stator spacing.
fixed-The spacing range of the rotor is0.2 ~ 0.4 mm

rateV= 3.14 X D(rotor diameter)XRotational speedRPM / 60

So the rotational speed and dispersion head structure are important factors affecting dispersion, and the high rotational speed and shear rate of the ultra-high speed dispersion homogenizer disperser are crucial for obtaining ultrafine suspensions

GRS2000Adopting an upright design allows all materials to enter the dispersion chamber, meeting process and fluid mechanics requirements, increasing its work efficiency. The discharge design at the lower outlet meets production requirements, and the vertical pressure makes the machine work more stably and easy to clean. Taking into full consideration the standards of FDA and EHEDG, the materials in contact with GRS2000 are made of SS316 steel or more acid and alkali resistant Hastelloy alloy according to production requirements, greatly enhancing its wear and corrosion resistance, and preventing physical and chemical changes between equipment and materials that may cause pollution. Adopting a three-layer structure cartridge type mechanical seal design, it can be quickly installed, has high reliability, and is suitable for the pharmaceutical industry. According to pharmaceutical specifications, surface treatment is carried out on the dispersion chamber and discharge port to achieve high surface treatment quality and no SicornerDesigned for easy cleaning and in compliance with CIP and SIP cleaning standards.