On polyolefin plastics for medical applications and processing technology

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It is predicted that from 2003 to 2005, China s medical device market will grow by 40%, the medical plastic will continue to increase. This trend is rising, forming a hu ge potential market of medical products.

With the growing awareness of people s health, the gradual improvement of the medical insurance system, medical product requirements will be higher. In order to meet the use requirements, the necessary modification of raw materials and improve the molding process is necessary. This paper describes several polyolefin medical plastic the processing modifier technology and products forming a new process.Poliglecaprone 25

1, polyvinyl chloride (PVC)

PVC has good chemical resistance, mechanical properties and electrical properties, but its resistance to heat and light stability. By processing the modified PVC plastic, can be widely used to make storage blood bags, blood bags and blood catheters, artificial peritoneum, artificial urinary bag artificial lung, cardiac catheterization and artificial heart and other products.

PVC gl ass transition temperature (Tg) is higher, the hardness of the material, the molding process difficult. Thus, the ships are added to the PVC resin, plasticizer and other additives. At present, still in the processing phthalate, dioctyl phthalate (DOP) as a primary plasticizer [1]. DOP is a low molecular weight substances, easy migration precipitation. DOP plasticized PVC for medical tubing or container, the DOP easy precipitation mixed with liquid or blood will lead to enter the body of the DOP with liquid or blood. In order to protect the health and safety of PVC medical plastic abroad are developing toxicity lower than the DOP, the migration precipitation DOP small new plasticizer, including good health citric acid esters, higher molar mass polyester class and other polymeric plasticizer.surgical sutures types

Stabilizer in PVC processing, lead salt is toxic to blood, causing severe anemi a, even more cadmium salts; better tin salt and epoxidized soybean oil. Generally used in dissolution less the organotin appropriate, which the two mercapto Titanium octyl di-n-octyl tin (Jing tin 8831) is a non-toxic organic tin stabilizer, excellent heat resistance and transparency, but lubricity than poor. Calcium stearate (Cast) and zinc stearate (ZnSt) is a non-toxic, transparent, stabilizers, there is a good lubrication. Therefore, with a certain amount of CAST and ZnSt of make up two mercapto acid isooctyl di-n-octyl tin (tin Beijing 8831) the shortcomings of poor lubrication. Medical PVC products in the processing, the choice of the internal and external lubrication are good N, N -B the Thalidomide (EBS) bistearic and silicone oil as a lubricant, a small amount of ACR as a processing aid, help to improve the surface of the PVC plastic quality.