Anti-rust film production process

Anti-rust film production process

Antirust film is the abbreviation of VCI antirust film (VCI antirust film), which is a new generation of innovative high-tech products based on the combination of polymer materials and VCI vapor phase antirust technology development. After the antirust metal article is packaged and sealed with an antirust film (can also be made into various plastic bag shapes), the VCI contained in the film begins to sublimate and volatilize the antirust gas factor, which diffuses and penetrates to the surface of the antirust article and absorbs it. On the surface, a dense protective film layer with a thickness of one molecule is formed to isolate various factors that induce corrosion from contacting the surface of the anti-rust object, thereby effectively preventing the occurrence of rust.

At present, there are mainly two methods for the production process of anti-rust film, namely coating method and blow molding method. Coating-type anti-rust film is based on polyethylene, polypropylene or other plastic film as the carrier, and the coating solution uniformly mixed with adhesive, gas phase anti-rust agent and solvent is coated on the surface of the surface-treated film. , and then dried to obtain an antirust film.

1. Advantages and disadvantages of using coating process to produce anti-rust film

(1) Main advantages

① During the production process, the vapor phase anti-rust agent does not undergo high-temperature resistance treatment, and has a wide range of selection, which is relatively easy to obtain good anti-rust effect.

②Preliminary anti-rust is good. The anti-rust agent exists in the surface coating of the anti-rust film, which can volatilize quickly into the space of the package, showing the anti-rust effect.

③The production process is relatively simple.

(2) Main disadvantages

① Poor appearance uniformity, usually poor transparency.

②The coating is easily rubbed off.

③Solvent drying consumes energy and may cause pollution to the environment.

④Plastic film needs to be used as raw material, and the production process is relatively long.

2. Example of coating type antirust plastic film

The LDPE film is used as the base material, and the gum arabic solution containing the vapor phase corrosion inhibitor is coated on the surface, and the vapor phase antirust film is obtained after drying to remove the solvent. Formaldehyde in the formula is the "hardening agent" and antifungal agent of gum arabic, and cyclohexylamine laurate is a corrosion inhibitor and a surfactant, which has good wettability to LDPE film and can reduce the viscosity of gum arabic. Surface performance, improve the adhesion between resin glue solution and LDPE film. The combination of cyclohexylamine laurate and ethylene glycol amine benzoate can prevent the precipitation of additives and form a uniform coating. The anti-rust film has good anti-corrosion effect on steel, aluminum, aluminum alloy and copper. The LDPE or HDPE plastic film produced by blowing after adding a certain proportion of VCI masterbatch, the VCI carrier is a plastic film, and the VCI will be continuously and slowly released from the film body in an appropriate space, forming a saturated gas in a relatively closed space layer, thereby forming an antirust protection for metallic materials in the environment. The varieties of anti-rust film are: ordinary anti-rust film, anti-rust stretch film, anti-rust embossed film, anti-rust heat shrinkable film, anti-rust bubble film, anti-rust and anti-static film, etc., and use different VCI for different metals grade.

Nanjing Sumino Precision Machinery Co., Ltd specializes in the production of release paper coating machines. The company is committed to creating a coating machine production line with uniform coating, high smoothness, and high cleanliness. The company mainly operates coating machine production lines including release paper coating machine, optical film coating machine, automotive heat insulation film coating machine, water treatment film coating machine, aluminum foil coating machine, dimming glass coating machine, thin film coating machine Fabric machine, PDLC dimming film coating machine, lithium battery extrusion coating machine, laboratory lithium battery coating machine, etc.