Medical Main Raw Material Price Trend – Polyvinyl Chloride(PVC) 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:

PVC, Polyvinyl chloride

PVC resin powder is white or light yellow powder. Pure PVC is atactic, hard and brittle, and is rarely used. According to different purposes, different additives can be added to make PVC plastic parts present different physical and mechanical properties. Adding an appropriate amount of plasticizer to the PVC resin can make a variety of hard, soft and transparent products.

Hard PVC does not contain or contains a small amount of plasticizer, has good tensile, flexural, compression and impact resistance, and can be used as a structural material alone. Soft PVC contains more plasticizers, its flexibility, elongation at break, and cold resistance increase, but its brittleness, hardness, and tensile strength decrease. The density of pure PVC is 1.4g/cm3, and the density of PVC plastic parts added with plasticizers and fillers is generally in the range of 1.15~2.00g/cm3.

According to incomplete estimates, approximately 25% of medical plastic products are PVC. Mainly because of the low cost of the resin, wide application range, and easy processing. Medical PVC products include: hemodialysis tubing, breathing mask, oxygen tube, etc.

According to market estimates, approximately 25% of medical plastic products are PVC. PVC is one of the largest plastic varieties in the world. PVC resin is white or light yellow powder. Pure PVC is atactic, hard and brittle, and is rarely used. According to different purposes, different additives can be added to make PVC plastic parts present different physical and mechanical properties. Adding an appropriate amount of plasticizer to the PVC resin can make a variety of hard, soft and transparent products. Hard PVC does not contain or contains a small amount of plasticizer, has good tensile, flexural, compression and impact resistance, and can be used as a structural material alone. Soft PVC contains more plasticizers, its flexibility, elongation at break, and cold resistance increase, but its brittleness, hardness, and tensile strength decrease. The density of pure PVC is 1.4g/cm3, and the density of PVC plastic parts added with plasticizers and fillers is generally in the range of 1.15 ~ 20g/cm3. Mainly because of the low cost of the resin, wide application range, and easy processing. Medical PVC products include: hemodialysis tubing, breathing mask, oxygen tube, etc. The processing conditions are injection molding, extrusion, film blowing, and calendering. Usually no drying treatment is required. Melting temperature: 170-200℃, mold temperature: 20-50℃. Injection pressure: up to 1500bar, holding pressure: up to 1000bar. Injection speed: In order to avoid material degradation, a relatively low injection speed is generally used. Main performance characteristics Cyclohexanone is usually used to bond PVC parts. In actual use, PVC materials often add stabilizers, lubricants, dyes and other additives. Lead and barium additives are the most effective heat stabilizers for PVC, but they are prohibited from being used in medical treatment. Calcium and zinc additives are often used as stabilizers for medical grade PVC. Phthalate (DEHP) is used as a plasticizer for medical PVC. The precipitation of this plasticizer can cause harm to the human body. It has attracted the attention of European and North American health organizations. my country’s drug regulatory authorities have also begun to pay attention to this problem. PVC is a polar material, and it is easy to adsorb some polar drugs.

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