Medical Main Raw Material Price Trend – Polystyrene(PS) and K Resin Leave a comment

Medical Materials-Plastic

Polystyrene(PS) and K Resin. 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:

Polystyrene (PS) and K resin

Polystyrene(PS) is a type of plastic second only to polyvinyl chloride and polyethylene. It is usually processed and applied as a single-component plastic. Its main characteristics are light weight, transparency, easy dyeing, and good molding and processing performance. Therefore, it is widely used in daily plastics, Electrical parts, optical instruments and cultural and educational supplies. The texture is hard and brittle, and has a high coefficient of thermal expansion, which limits its application in engineering. In recent decades, the development of modified polystyrene and styrene-based copolymers has overcome the shortcomings of polystyrene to a certain extent. K resin is one of them.

K resin is a copolymer of styrene and butadiene. It is an amorphous polymer, transparent, odorless, non-toxic, with a density of about 1.01g/cm3 (lower than PS and AS), and higher impact resistance than PS , Good transparency (80~90%), heat distortion temperature of 77℃, the amount of butadiene in the K material, its hardness is also different, because the K material has good fluidity, the processing temperature range is wide, so its Good processing performance.

The main uses in daily life include cups, lids, bottles, cosmetic packaging, hangers, toys, PVC substitute products, food packaging and medical packaging supplies.

PS is the third largest plastic species after polyvinyl chloride and polyethylene. It is usually processed and applied as single-component plastics. Its main characteristics are light weight, transparency, easy dyeing, and good molding and processing properties, so it is widely used in Japan. Use plastics, electrical parts, optical instruments and cultural and educational supplies. The texture is hard and brittle, and has a high coefficient of thermal expansion, which limits its application in engineering. In recent decades, the development of modified polystyrene and styrene-based copolymers has overcome the shortcomings of polystyrene to a certain extent. K resin is one of them. In daily life , the main applications in life include cups, lids, bottles, cosmetic packaging, hangers, toys, PVC substitute products, food packaging and medical packaging supplies. Through the use of injection molding, the water absorption of the K material is generally not extruded and blown film, and it does not need to be dried before processing. If the K material is stored in an open environment with high humidity for a long time, it needs to be dried (below 65°C). Thicker products can be cooled in water after being taken out to get uniform cooling and avoid cavitation! Main performance characteristics: extremely high transparency and surface gloss; low shrinkage (0.4~0.7%). K resin, compared with ordinary PS, has superior toughness. For some samples with larger thickness, K resin still has the problem of gravitational cracking, so you need to choose the grade carefully before use. But the heat resistance is low, and the heat distortion temperature is generally 70-98°C, which can only be used at low temperatures. It has poor chemical resistance and is easily corroded by oil, acid, alkali and active organic solvents.

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