Introduction of Hawach Microporous Membrane Products
The microporous membrane is one of the most widely used membrane types in membrane separation technology. It has the characteristics of large gas flux, high particle retention rate, good temperature resistance, strong acid, strong alkali, organic solvent and oxidant, anti-aging and non-stick, non-flammable and non-toxic, and good biocompatibility. Its material can be divided into organic and inorganic categories.
In view of the separation characteristics of the microporous filter membrane, the application scope of the microporous filter membrane is mainly to trap particles, bacteria and other pollutants in the gas phase and liquid phase to achieve the purpose of purification, separation, and concentration.
For microfiltration, the membrane interception characteristics are characterized by the pore size, usually ranging from 0.1 microns to 1 micron, It can be used for clarification, security filtration and air sterilization of general liquid. It is widely used in scientific research, medicine and health, biochemistry, food, energy, microelectronics industry, nanotechnology, environmental protection, and other departments.
Microporous membrane application
This product is mainly used for the filtration of the mobile phase and sample in chromatographic analysis. It has a good effect on protecting the chromatographic column, infusion pump pipe system and injection valve from contamination.
Microporous membrane material
Precautions when using microporous membrane products
The determination of the bubble point: the determination of the bubble point pressure can reflect the pore size of the microporous membrane, which is closely related to the quality of the filtered microporous membrane solution, and is also a kind of important means to guarantee the quality of the microporous membrane. The microporous membrane used should be immersed in water for injection at 70 ° C for 1 h. Pour out the water and soak it in warm water for a night. Take it out when it is used, rinse it with water for injection, and put it into the filter for installation. Prevent the membrane from leaking.
To protect the service life of the filter, you can use the same size filter paper or crepe cloth (you should first boil the crepe cloth with a mass concentration of 20 g·L -1 sodium sulfonate solution for about 30 min, then clean it with water for injection) Place on the filter to prevent the filter from rupturing.
The pore size of the microporous membrane is cone-shaped, the smooth one side has a small aperture for the front side; the rough one side has a large aperture for the reverse side. When installing, the front side (glossy side) should face up and the reverse side (dark side) face down, otherwise It is easy to be blocked by impurities and affects the filtration rate. When the temperature is low, the treated filter membrane should be immersed in the water for injection with the same temperature as the liquid medicine for 5 to 10 minutes to avoid the cracking caused by the decrease of the tensile strength of the filter due to the temperature difference.
On the leather tube head of the exhaust pipe of the filter holder, fix a 16-gauge infusion needle and control it with a water stop clamp to avoid the rupture of the filter membrane due to excessive discharge pressure and speed.
Do not sterilize the filter holder together with the filter membrane. Otherwise, the filter membrane will be brittle and wrinkled due to thermal expansion and contraction.
After use, the microporous membrane is placed in water for injection to prevent drying, but do not soak for too long. Do not use the microporous membrane that has been dehydrated and dried.
Depending on the concentration and viscosity of the liquid, microporous membranes with different pore sizes should be used.
If the microporous membrane is found to have small holes or small cracks, it can be rinsed with the original filter membrane and dried, then shredded into a small cup of acetone and stirred into a paste mucus. Drop the small holes or small cracks in the flat membrane. It should not be too much. The mucus should be covered and slightly larger. After drying, it can be used without affecting.
When infusion filtration is first used in the multi-stage filtration device after coarse filtration and fine filtration, the microfiltration membrane can be used as the final fine filtration, and the pressure, decompression and azimuth static filtration methods should be adopted.