What about the surface of plastic shell for medical instruments?
The method is mainly applicable to polyethylene, polypropylene, polyisobutylene, polyvinyl chloride and perchloroethylene.The degreasing solvent for the said plastics is acetone and butanone.After degreasing, treatment of oxidizing flame: first use the coarse cloth, placed on the oxidizing flame burn 3-5s, three times in a row. Sodium hydroxide solution with 30% DEG C, 65-70 impregnated 3-5min, rinse with cold water, and then activated by the solution, 65-70 ~ C impregnated 5-10min: 10 sulfuric acid 20 40 chromic acid water after washing, and then in the solution of 70-75 ~ C 5-7min: 10 sulfuric acid dichromate oxidation of 50 water 340 and then washing at 70-75 DEG C hot water in 5-7min, washed with distilled water after drying at 65-70 DEG C.
Plastic surface treatment methodPlastics can be divided into two categories: thermoplastic and thermosetting plastics. In general, thermosetting plastics are more adhesive to thermoplastic. But their surface energy was lower than that of glass, ceramics, metal and other hydrophilic material, and they often release agent or surface adhesion escape plasticizer, it is not easy for the infiltration of adhesive, thus affecting the bonding strength. Therefore, plastic surface treatment is usually required. Because of the variety of plastics and various properties, the methods of surface treatment are very different. Here are some of the common methods of plastic surface treatment.
Plastic surface treatment methods for medical instruments are available:Forming, drilling, deburring, cleaning, spraying (screen printing, printing), electroplating.In addition to the non-toxic precipitation, no excessive RHOS, when necessary, to achieve durable structural requirements, and other general plastic treatment methods are the same.
