September 30, 2022
The choice of color coated plate mainly refers to the mechanical properties, substrate type (coating type) and coating weight, front coating performance and reverse coating performance selection. Application, environmental corrosion, service life, durability, processing mode and deformation degree are important factors to be considered when selecting materials.
Choice of front coating properties
The selection of front coating properties mainly refers to the selection of coating type, coating thickness, coating color difference, coating gloss, coating hardness, coating flexibility/adhesion, coating durability and other properties.
Coating types
paint
Commonly used finishes are polyester, silicon modified polyester, high durability polyester and polyvinylidene difluoride. There are certain differences in hardness, flexibility/adhesion, corrosion resistance and other aspects of different finishes. Polyester is currently the most used coating, durability is average, coating hardness and flexibility is good, affordable. The durability and gloss and color retention of silicon modified polyester were improved, but the flexibility of the coating was slightly reduced. High durability polyester not only has the advantages of polyester, but also improved in durability, high cost performance. Polyvinylidene difluoride has excellent durability, good flexibility of the coating, but relatively low hardness, less color available, and expensive. The detailed performance index of all sorts of finish paint can refer to concerned data or consult expert. Surface paint mainly according to the use, environmental corrosion, service life, durability, processing mode and deformation degree of factors to determine.
primer
The commonly used primers are epoxy, polyester and polyhelioester. There are some differences in adhesion, flexibility and corrosion resistance among different primers. Epoxy binds well to the substrate and is resistant to corrosion, but not as flexible as other primers. Polyester has good adhesion to the substrate, excellent flexibility, but corrosion resistance is not as good as epoxy. Polychlorinated ester is a primer with relatively good comprehensive properties. The detailed performance index of various primers can refer to relevant data or consult experts. Primers are usually determined by the manufacturer based on the process, use, environmental corrosion, and match with the topcoat.
The thickness of the coating
The corrosion resistance of color coated plate is closely related to the coating thickness, and the corrosion resistance usually increases with the increase of coating thickness. The appropriate coating thickness should be determined according to environmental corrosion, service life and durability. Color difference coating plate in the process of production and use may appear color difference, because the color difference is affected by the production group batch, color depth, use time, use environment, use and other factors, so it is usually negotiated by the supply and demand parties when ordering.
Gloss coating
The coating gloss is mainly selected according to the use and usage habits. For example, domestic construction with color coated board usually choose medium, low gloss, household appliances with color board usually choose high gloss.
The coating hardness
Coating hardness is the ability of coating resistance to scratch, friction, collision, depression and other mechanical effects, and the scratch resistance, wear resistance, indentation resistance and other properties are closely related to the color coated plate, mainly based on the use, processing mode, storage and transportation conditions to choose.
Coating flexibility/adhesion
Coating flexibility/adhesion and color coated plate machinability is closely related, mainly according to the processing mode, deformation degree, etc. When the deformation speed is fast and the degree of deformation is large, the color coated plate with high impact value and small T-bend value should be selected.
Durability of coating
Coating durability is the performance of color coated plate reflected in the use process, usually measured by the length of service life. Coating durability is mainly affected by coating type, coating thickness, environmental corrosion and other factors. The true durability of the coating can be determined by atmospheric exposure test. Durability can also be evaluated by artificial aging tests. Neutral salt spray resistance test is one of the simplest and most commonly used artificial aging test methods. Ultraviolet lamp accelerated aging test is also commonly used artificial aging test. In addition, color coated plate may be used in acid rain, humidity and other special environments, at this time should also choose the corresponding artificial aging test for evaluation. It should be noted that artificial aging test usually can not fully simulate the actual use environment.
Other performance color coated plate in some cases may need to have a relatively good organic solvent resistance, acid and alkaline resistance, pollution resistance and other properties, for this kind of special performance should also pay attention to. Selection of reverse coating properties Reverse coating is usually determined by the manufacturer according to the purpose and environment of use. When the corrosion of the environment is not high, the reverse side is usually coated with a layer, mainly playing a decorative role. If the heat insulation material is pasted on the reverse side, it should be noted when ordering so that the manufacturer can coat the opposite side with a good adhesive property. When the environment is highly corrosive, a second layer should be coated to improve corrosion resistance.
