Coating classification: peelable coating

Core tip: Introduction: The coating has certain adhesion to the substrate, so the coating formed by the coating can protect the coated surface Because of this, it is very difficult to produce such a coating In order to adapt to the technical requirements of modern industry that some products or components only need to be temporarily sealed, a new type of coating is prepared After the fine and smooth surface of the object in transportation is protected from bumps and scratches or rust, moisture and corrosion, the coating can be easily peeled off, which is called peelable coating Peelable coating is a kind of long-term sealing for metal products Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Introduction: the coating has certain adhesion to the substrate, so the coating formed by the coating can play a protective role on the coated surface Because of this, it is very difficult to produce such a coating In order to adapt to the technical requirements of modern industry that some products or components only need to be temporarily sealed, a new type of coating is prepared After the fine and smooth surface of the object in transportation is protected from bumps and scratches or rust, moisture and corrosion, the coating can be easily peeled off, which is called peelable coating Peelable coating is a kind of coating used for long-term storage and short-term rust protection of metal products It has the shielding protection function of general coating The coating formed on the surface of products can prevent metal corrosion and scratch, and is convenient for storage and transportation Classification and performance: strippable coatings are generally divided into hot-melt type and solvent type When using the hot-melt peelable coating, first heat it to a flowing liquid, then immerse the metal parts in the liquid tank, take it out after a few minutes, and when it cools, a relatively smooth and uniform protective thin shell will condense on the surface of the metal products The film-forming materials of peelable coatings are usually ethyl cellulose with high mechanical strength and poor elasticity, or cellulose acetate butyrate with low mechanical strength and good elasticity The hot-melt peelable coating can withstand harsh natural conditions and has good effect on the workpiece with high requirements for transportation and storage period For large-scale metal parts, because the cost of hot-melt strippable coating is high and the soaking process needs a large volume of soaking tank, it is not applicable, so solvent strippable coating is generally used for large-scale metal parts The film-forming substances of solvent based peelable coatings are usually ethylene polymers such as perchloroethylene and polyvinyl acetal This kind of peelable coating contains a large number of solvents and diluents, which can be applied by spraying This kind of coating is mostly used in short-term storage and transportation of workpieces, as well as precision parts and large-scale equipment that can not withstand high temperature Composition: 1 The base material is the film-forming material of the coating, its performance determines the performance of the peelable coating Therefore, the selection of ideal base material is the key to prepare the coating Generally, the film-forming materials with moderate adhesion and low price are determined by comparing and selecting the common film-forming materials such as PVC, perchloroethylene, ethyl cellulose, acrylic resin and epoxy resin 2 In order to reduce the intermolecular attraction and temperature, increase the plasticity and reduce the brittleness of the film-forming materials, and make the film-forming materials have good flexibility in a certain range, it is necessary to add plasticizer 3 Due to the characteristics of polymer materials and the influence of solvent volatilization, the inhibitor will make the structural hole with the diameter of 10-5-10-7 cm and the real hole with the diameter of 10-2-10-4 cm, so that the coating has the risk of reducing the permeability of corrosive medium Therefore, it is necessary to add inhibitor in the coating 4 In order to prevent the film from adhering to the surface of the protected object, the lubricant is conducive to the peeling off of the film from the object surface, and at the same time, it can form a thin oil film with slow-release effect on the object surface, so as to further improve the protection of the film 5 In order to meet the requirements of long-term storage in high temperature, high humidity and strong corrosive atmosphere, other additives are usually required to be added according to the requirements, so the coating is required to have excellent oxidation resistance, moisture resistance, mildew resistance and thermal stability Performance and technical indicators: Construction: process flow construction procedure ① the protective effect of the preparation coating on the sealed parts, one of the key is whether there is a clean surface to be coated Suitable rust inhibitor and cleaning agent can be used to remove the rust and dirt on the surface of the workpiece, and the surface of the substrate shall be free of oil, rust and water ② Spray, brush and dip coating can be used for coating: put the prepared normal temperature curing peelable coating into the spray gun cylinder, spray with clean compressed air, the spraying pressure is 150-250 MPa, the distance between the spray gun mouth and the surface to be coated is 200-250 mm, and pay attention not to spray too thick once in the spraying process, generally controlled within the range of 0.02-0.03 mm Dip coating: small parts can be dip coated Put the coating into a clean container, then dip the clean part into the coating for 2-3 minutes, take it out and leave it in the air for 8-10 minutes, and then repeat it for 2-3 times, so that the coating thickness is not less than 0.15 mm The coating layer after spraying, soaking and brushing must be uniform For the convenience of unsealing, a peeling off line (such as nylon rope) can be embedded on the surface of metal parts to facilitate the peeling off of the coating At the same time, if there are deep holes, grooves or the shape of the parts is too complex, it can be wrapped and blocked with vapor phase corrosion inhibitor or non corrosive paper before coating ③ No matter which coating method is adopted for drying, it can be naturally dried in the air, and the drying time varies according to the season But it can also be baked at 60-70 ℃ for 20 min ④ In case of missing coating of the layer and local scratch due to the product surface during transportation or other reasons during inspection and repair, acetone or xylene can be used to remove the area and a brush can be used to repair the area Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,