Medical Main Raw Material Price Trend – Polypropylene(PP) 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:

PP, polypropylene

PP is colorless, tasteless and non-toxic. It looks like polyethylene, but it is more transparent and lighter than PE. PP is a kind of thermoplastic with excellent performance. It has the advantages of small specific gravity (0.9g/cm3), non-toxicity, easy processing, impact resistance and flexural resistance. It has a wide range of applications in daily life, including woven bags, films, turnover boxes, wire shielding materials, toys, car bumpers, fibers, washing machines, etc. Medical PP has higher transparency, better barrier properties and radiation resistance, making it widely used in medical equipment and packaging industries. Non-PVC material with PP as the main body

It is a substitute for the widely used PVC material.

Polypropylene is colorless, odorless and non-toxic. It looks like polyethylene, but it is more transparent and lighter than polyethylene. PP is a kind of thermoplastic with excellent performance. It has the advantages of small specific gravity (0.9g/cm3), non-toxicity, easy processing, impact resistance and flexural resistance. It has a wide range of applications in daily life, including woven bags, films, turnover boxes, wire shielding materials, toys, car bumpers, fibers, washing machines, etc. Medical PP has higher transparency, better barrier properties and radiation resistance, making it widely used in medical equipment and packaging industries. Non-PVC material with PP as the main body is a substitute for the widely used PVC material. The processing technology can be injection molded, extruded, blown, or made into a film drying process: low water absorption, no drying process is required. Melting temperature: 220-270℃, be careful not to exceed 275℃. Mold temperature: 40-80℃, 50℃ is recommended. Injection pressure: up to 1800bar, injection speed: using high-speed injection can reduce the internal pressure to a minimum. If there are defects on the surface of the product, low-speed injection at a higher temperature should be used. Runners and gates: For cold runners, the typical runner diameter range is 4-7mm. It is recommended to use a circular injection port and runner. All types of gates can be used. The typical gate diameter ranges from 1 to 1.5mm, but gates as small as 0.7mm can also be used. For edge gates, the minimum gate depth should be half the wall thickness; the minimum gate width should be at least twice the wall thickness. PP material can use hot runner system. PP is a semi-crystalline material with high melting point, good heat resistance, and can be sterilized at temperatures above 100°C. The yield strength, tensile strength, compressive strength, hardness and elasticity are higher than those of polyethylene (PE). Random copolymer PP synthesized with ethylene has better toughness and stronger impact strength. For products usually used under low temperature conditions, it is necessary to use copolymer PP as much as possible, or add thermoplastic rubber to modify PP to increase its flexibility and low temperature impact resistance. PP products are not easy to bond, and need to be processed before bonding, and special adhesives must be used. The cyclohexanone used by the equipment factory cannot meet the requirements. PP film is usually welded into bags by heat sealing method, and its processing technology is more complicated than that of high-frequency welding PVC bags.

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