Medical Main Raw Material Price Trend – Polythylene(PE) Leave a comment

Medical Materials-Plastic

The basic requirements of medical plastics are chemical stability and biological safety, because they are in contact with drugs or the human body. The components in the plastic material cannot be precipitated out into the liquid medicine or the human body, will not cause toxicity and damage to tissues and organs, and are non-toxic and harmless to the human body. In order to ensure the bio-safety of medical plastics, medical plastics that are usually sold on the market are certified and tested by medical authorities, and users are clearly informed which grades are medical grade.

The application of plastics in medical plastics has a low cost and can be reused without disinfection. It is suitable for use as raw materials for the production of disposable medical devices; it is simple to process and can be processed into a variety of useful structures by its plasticity, while metal and glass are difficult Manufactured into products with complex structures; tough, flexible, not as easily broken as glass; with good chemical inertness and biological safety. These performance advantages make plastics have a wide range of applications in medical equipment, including polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC), ABS, Polyurethane, polyamide, thermoplastic elastomer, polysulfone and polyether ether ketone, etc. Blending can improve the performance of plastics and make the best performance of different resins manifested, such as polycarbonate/ABS, polypropylene/elastomer and other blending modification. The 7 commonly used medical plastics are polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS) and K resin, acrylonitrile-butadiene-styrene (ABS), Polycarbonate (PC) and polytetrafluoroethylene (PTFE) general plastics are synthesized and come out of the synthesis tower of a large petrochemical plant. They are all flour-like powders and cannot be used to directly produce products. This is what people often say The composition of fat extracted from tree sap is the same, also called resin, also called powder. This is a pure plastic with poor fluidity, low thermal stability, easy aging and decomposition, and not resistant to environmental aging. In order to improve the above defects, heat stabilizers, anti-aging agents, anti-ultraviolet agents, plasticizers, etc. are added to the resin powder, which is modified by granulation to increase its fluidity, and produce special products suitable for various processing techniques. Performance, different grades of plastic varieties. The plastic materials commonly used by medical device manufacturers are all modified plastic particles that can be used directly. For products with special properties that are not available in the market, equipment factories can introduce granulation production lines and process and produce plastic granules through different formulation designs. Therefore, there are many grades of the same type of plastic. According to the processing method, there are injection molding grade, extrusion grade, and blown film grade; according to performance, there are high rigidity, toughening, etc. . The components in the plastic material cannot be precipitated out into the liquid medicine or the human body, will not cause toxicity and damage to tissues and organs, and are non-toxic and harmless to the human body. Due to contact with the liquid medicine Or in contact with the human body, the basic requirements of medical plastics are chemical stability and biological safety. In order to ensure the bio-safety of medical plastics, medical plastics that are usually sold on the market are certified and tested by medical authorities, and users are clearly informed which grades are medical grade. At present, there are still quite a few medical plastic materials in China that have not undergone strict biosafety certification, but with the gradual improvement of laws and regulations, these situations will be improved. Medical plastics in the United States usually pass FDA certification and USPVI biological testing, and medical-grade plastics in my country are usually tested by Shandong Medical Device Testing Center. According to the structure and strength requirements of the equipment products, we choose the appropriate plastic type and the appropriate brand, and determine the processing technology of the material. These properties include processing performance, mechanical strength, use cost, assembly method, sterilization and so on. The processing properties and physical and chemical properties of several commonly used medical plastics are briefly introduced as follows:

PE, Polyethylene

PE plastic is the most produced variety in the plastic industry, milky white, odorless, odorless and non-toxic glossy waxy particles. It has good performance and can be widely used in industry, agriculture, packaging and daily industry.

PE mainly includes low-density polyethylene (LDPE), high-density polyethylene (HDPE), and ultra-high molecular weight polyethylene (UHDPE). HDPE has fewer branches on the polymer chain, higher molecular weight, higher crystallinity and density, higher hardness and strength, poor opacity, and higher melting point. It is often used in injection molded parts. LDPE has many branches, so the relative molecular weight is small, the crystallinity and density are low, it has good flexibility, impact resistance and transparency. It is often used in blown film and is an alternative to the widely used PVC. . It is also possible to mix HDPE and LDPE according to performance requirements. UHDPE has high impact strength, low friction, stress crack resistance and good energy absorption characteristics, making it an ideal material for artificial hip, knee and shoulder connectors.

Polyethylene plastic is the most produced variety in the plastic industry. It is milky white, odorless, odorless and non-toxic glossy waxy particles. It is characterized by low price and good performance. It can be widely used in industry, agriculture, packaging and daily industries, and it occupies a pivotal position in the plastics industry. PE mainly includes low-density polyethylene (LDPE), high-density polyethylene (HDPE), and ultra-high molecular weight polyethylene (UHDPE). HDPE has fewer branches on the polymer chain, higher molecular weight, higher crystallinity and density, higher hardness and strength, poor opacity, and higher melting point. It is often used in injection molded parts. LDPE has many branches, so the relative molecular weight is small, the crystallinity and density are low, it has good flexibility, impact resistance and transparency. It is often used in blown film and is an alternative to the widely used PVC. . It is also possible to mix HDPE and LDPE according to performance requirements. UHDPE has high impact strength, low friction, stress crack resistance and good energy absorption characteristics, making it an ideal material for artificial hip, knee and shoulder connectors. The processing conditions generally do not require drying, the melting temperature is 170-260°C, and the mold temperature is 20-40°C. Injection pressure: up to 1500bar, holding pressure: up to 750bar, injection speed: fast injection speed is recommended. Runners and gates: Various types of runners and gates can be used. LDPE is particularly suitable for the use of hot runner molds. The most notable feature of PE parts is the large molding shrinkage rate, which is easy to shrink and deform. PE has a wide processing temperature range and is not easy to decompose (the decomposition temperature is about 300°C). Its processing temperature is preferably 180-220°C. If the injection pressure is high, the product density will be high and the shrinkage rate will be small. Same as PP, PE is a non-polar material, which is not easy to adhere and has a small amount of drug adsorption. It cannot be processed by high-frequency welding. The bag should be welded using a heat sealing process. During the molding process, the material temperature and mold temperature should be higher, and the injection pressure should be as low as possible under the premise of ensuring the quality of the parts.

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