Preparation And Modification Of Stainless Steel Deep Drawing Film

Stainless steel material is used very widely in daily life whether in agriculture orindustrial, but it is also easily scratched and deformed.Thus, the surface of stainlesssteel needs to be protected with protective film. Currently, stainless steel protectivefilm is generally made of polyethylene material, which was light-oxidative degradatedeasily, and it is non-polar material which shows bad bonding property in bonding andattachment. Another question should be concerned are glue residue and poorversatility, in addition，the solvent-based acrylic pressure sensitive adhesive maypollute the environment. To solve the problems above, light shielding agent was addedto offer the film with anti-photo aging ability, and a certain amount of surfacemodifier was also blended. Furthermore, preparation of water-based natural rubberpressure-sensitive adhesive for stainless steel deep drawing film was studied, whichprovide a good reference to expand the application of similar products. The mainresearch contents of this paper were as following.The best ratio was determined by comparing the mechanical properties of LDPEand LLDPE，and titanium dioxide grafted by silane coupling agent was blended withpolyethylene, then the mechanical properties was tested under UV light or heatingconditions. The results showed that tensile properties of composite film weredecreased slowly with the increase of aging time from20MPa to18MPa, and that ofthe film modified with0.5wt%TiO2was declined the least, the tensile strength of thecomposite film was reduced obviously when heating time reach about9days, then itleveled off, remaining at about17MPa.Polyethylene（PE）was modified by mixing the chloroprene rubber grafted withmethyl methacrylate (CR-g-MMA) and then composite films were prepared by hotpressing. The migration velocity of CR-g-MMA was indirectly gotten by studying thecontact angle of blend membranes at different times and temperatures, andmechanical properties, thermal properties and microstructure characterization werealso analyzed. The results showed that the contact angle was decreased with longer time, higher temperature and the increase of modifier content, the contact angle ofextrusion composite film was slightly smaller than that of solution composite film.The natural rubber latex pressure sensitive adhesive was prepared with differentproportions of the terpene resin, and the optimum addition ratio of terpene resin wasdetermined by testing the performance of pressure-sensitive adhesive. Then naturalrubber was grafted with methyl methacrylate(MMA) and maleic anhydride（MAH）respectively, and their performance was compared. Finally, the effects ofpressure-sensitive adhesive were studied by coating the polyethylene film withchloroprene rubber, which was grafted with methyl methacrylate as undercoat.Research showed that initial tack and holding tack performance were better than othersamples when the the mass percentage of terpene resin was30%,180°peel strengthwere almost the same when the the mass percentage of MMA monomer was from5%to20%. When the MMA monomer was more than30%,180°peel strength of naturalrubber pressure-sensitive adhesive started to reduce with the increase of monomeradded. There would be degumming when the amount of MMA monomer reached30%.The bonding property of natural rubber pressure-sensitive adhesive with the PE layerwas significantly improved in the condition of undercoat. The graft effect of MMAmonomer was better compared to the MAH, and the adhesive film performance couldmeet the demand of stainless steel deep drawing film.