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The project leader Yin Jinghua, a researcher at the Changchun Institute of Applied Chemistry at the Chinese Academy of Sciences, said that polyolefins are ideal alternatives to PVC, but the performance requirements for different types of infusion devices vary greatly, and common and unmodified polyolefins are difficult to Meet the requirements of various medical infusion devices. Through years of research, they have effectively solved the basic problems in the reaction processing of polyolefin materials, and successfully prepared a series of functional, high-performance polyolefin materials.
At present, functionalized polyolefin disposable medical infusion instruments have been successfully industrialized in Shandong Weigao Group and cumulatively produced 4.2 billion disposable medical infusion devices such as infusion (blood) devices, blood bags, peritoneal dialysis bags, and various medical catheters. Many (sets), the product is gradually replacing the traditional PVC similar products in China, and sold to the United States, Russia, Australia and other countries.
Yin Jinghua said that at present, China is most urgent to meet the requirements of materials for blood storage. Researchers took the lead in the research of polyolefin thermoplastic elastomer blood storage materials. Through screening, they found a blood storage material that is completely non-toxic and does not require plasticizers during processing—a polyethylene/polypropylene/styrene-ethylene-butadiene-styrene copolymer alloy material, after a series of treatments. A blood storage material superior in heat resistance, mechanical properties and hemolysis resistance was prepared. The test results show that the physical, chemical, and biological properties of this blood storage material meet the requirements of the national standard. Some of the physical properties and overall chemical properties are far superior to those of PVC materials, and they are expected to be used for the preservation of platelets, plasma, and stem cells.
Yin Jinghua said that up to now, ideal polyolefin materials for the preservation of whole blood and red blood cells, and the preservation cycle of red blood cells and PVC are still not available, and the research and development of such materials will be current and future medical polymer materials at home and abroad. Research hotspots and difficulties. In addition, the surface modification of polyolefin materials by chemical treatment, plasma, ultraviolet and radiation (γ-ray, electron beam) and other methods is one of the most effective methods to improve the blood compatibility of materials, and has the most industrial The prospects.
The research group has now successfully developed polypropylene and other radiation-resistant medical materials. Disposable medical syringes made of this material have self-lubrication and antibacterial properties and can be sterilized by radiation sterilization. Compared with traditional ethylene oxide sterilization methods, the hazards of ethylene oxide residues to the human body and the environment are eliminated. .
In the field of pharmaceutical infusion bag special materials and composite membranes, no domestic industrial products are available at present, mainly relying on imports. Shandong Weigao Group Co., Ltd. is using the technology developed by the project team to produce composite membranes and used in infusion filling production lines, with an annual output of 250 million infusion bags.
In addition to medical treatment, researchers have also developed products such as long-term anti-fog sheds for agricultural use and oil pipelines for oil fields, and have achieved large-scale production. The antifogging period of the functionalized polyolefin agricultural film produced by them has been more than 12 months, which is 3 to 4 times that of similar products in China and twice that of similar products in Japan and South Korea. It is currently in the northeast and north of China. The area has been widely used; the production of oil pipelines is chemically resistant, has a long service life, good thermal insulation, thermal conductivity is 1/200 of the steel pipe, construction is simple, can be laid long distances in swamps, low-lying land, is currently in Daqing, victory Oil fields such as Xinjiang are widely used.
Polyolefin modification: medical materials are safer
PVC has many hidden troubles as medical materials. At present, developed countries are eliminating medical PVC at a rate of 15% to 17% each year. In recent years, researchers in China have been conducting research on medical PVC substitute materials. The Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Shandong Weigao Group Co., Ltd., and Harbin Institute of Technology Wusu Industry Co., Ltd. have successfully used polyolefin thermoplastic elastomers instead of PVC for disposable medical infusion devices. The gap between China's and developed countries in R&D and application of medical polymer materials has been shortened, providing a guarantee for the safety of medical materials.