New Polypropylene Material - Microporous Membrane

Membrane technology is the fastest growing and eye-catching new technology in the world. The core of membrane technology is membrane materials. The research and development of membrane materials have been highly valued by the scientific and technological community in various countries. Membrane material is mainly a kind of functional material processed from polymer-polypropylene. It is widely used in industry, medicine, energy, military and daily life.
Due to the excellent properties of polypropylene itself, it is used to obtain microporous membranes by deep processing, which combines the efficient separation of functional membranes and the excellent mechanical properties of plastic films. The average pore size of the membrane is between 300 and 800 angstroms, which is a small pore size relative to the common microporous membrane. It can completely block a variety of bacteria larger than 0.2-0.5μ and dust more than 0.1μ, and even part of the larger virus, so the microporous membrane has a wide range of applications.
1) Medical Field The medical field has high requirements for the performance, accuracy, and safety of membrane materials used. Polypropylene microporous membrane has the characteristics of non-toxicity, good gas permeability and excellent biocompatibility. It is an ideal medical device and medical membrane. Mainly used for artificial kidney dialysis apparatus (membrane aperture 50-100 angstroms), artificial lung membrane oxygen is reasonable (membrane pore size (600-700 angstroms), electrocardiograph, etc.
Due to its small pore size, polypropylene microporous membranes are also commonly used in sterile filtration and aseptic packaging as well as industrial and military disposable protective clothing. Antibacterial adhesive plaster, wound base film, burn patient antibacterial clothing instead of skin limb, blood extracorporeal circulation, hemodialysis and so on.
2) Battery Industry:
Due to its small pore size, good resistance to acids, alkalis, and low electrical resistance, polypropylene microporous membranes are the most suitable material for making battery separators and separators.
Lithium batteries are an important small, high-performance battery that can be divided into lithium primary batteries and lithium batteries, such as button batteries and advanced camera batteries. Polypropylene microporous membranes used in lithium battery separators can make lithium batteries more compact, and improve reliability and power storage. At present, domestic production of microporous membranes for Lilichi is purchased from abroad.
In addition can also be used for alkaline batteries, lead-acid batteries, fuel cells and so on.
3) Air purification Air purification is very important in the industrial production process. In a factory that produces integrated circuits, extremely fine dust can make the product a waste product. Air purifiers made of polypropylene microporous membranes can solve this problem. It can also be used in anti-pollution devices in textile mills, in addition to soot, air enrichment and other devices.
4) Films for Food Industry Since polypropylene materials have high mechanical strength, acid resistance, alkalinity, and chemical resistance, the surface tension after corona treatment is increased, thereby improving the hydrophilic properties, and thus can be used as an excellent water treatment. The membrane can be used to prepare beverage water, pharmaceutical water, and ultrapure water, which are widely used in the food industry for the beer industry, fermentation industry, and plant protein processing. At the same time can be used for desalination, industrial wastewater treatment, dilute ammonia recovery.
5) Other industrial films:
In addition to the above uses, it can be used as a membrane for gas separation, a membrane for gas concentration, and a membrane for ion exchange such as a membrane electrolysis membrane (saline electrolysis), a liquid membrane support membrane, an ultrafiltration membrane, and the like.
6) Breathable waterproof membrane:
In addition to the above uses, microporous membranes have an extremely wide range of functions in daily life. Can be made of breathable rain cloth, raincoat, can be used as industrial, hospital and military protective clothing, but also can be used for food, agricultural and sideline products packaging, use its packaging vegetables, fruits, food, meat and flowers, that is, breathable, but also Preserve water and reduce condensation and bacteriostatic and antiseptic. It can automatically adjust the balance of gas, so as to achieve the purpose of preservation and prolong the shelf life of fresh products. Microporous membrane has a broad application prospect in the preservation of fruits and vegetables.
In addition, it can also be used for making baby diapers, sanitary napkins, etc., and it can use its breathable and water-impermeable properties as a film for the top layer and a film for the bottom layer.
China's scientific research units have mastered the processing technology of microporous membranes, but there is still a long way from mass production. At present, China's use of film basically relies on imports. In order to provide microporous membrane processing technology and information for domestic plastics processing companies, the China Association of Experts' Association Working Committee will organize a technical exchange meeting for microporous membrane processing technology, equipment and related contents in December this year. International experts will be invited by that time. Lectures to China, welcomed the guidance of domestic counterparts and related manufacturers. (Li Hongyun) From China Packaging Yearbook 1999