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1 Reasonable material selection not only meets the requirements for use, but also minimizes costs. If the material is not properly selected, the result may be that the material performance exceeds the use requirement, resulting in unnecessary waste, or it may not meet the requirements for use, resulting in degradation or unusable. Therefore, the demand side should attach great importance to the importance of rational material selection and, if necessary, consult relevant experts.
2 The choice of color coating mainly refers to the choice of mechanical properties, substrate type and plating weight, front coating performance, and reverse coating performance. The use, the corrosivity of the use environment, the service life, the durability, the processing method and the degree of deformation are important factors considered in the material selection.
3 Selection of Mechanical Properties, Substrate Type, and Plating Weight
3.1 The mechanical properties are mainly selected according to the use, processing methods and degree of deformation and other factors. When the strength requirement is not high and the deformation is not complicated, the TDC51D and TDC52D series color coated plates can be used. When there is a high requirement for formability, TDC53D and TDC54D series color coated plates should be selected. For the components with load-bearing requirements, suitable structural steels should be selected according to the design requirements, such as the color coated plates of TS280GD and TS350GD series. Shearing, bending, rolling, etc. are the commonly used processing methods for color-coated panels. When ordering, they should be selected according to the characteristics of each processing method. In actual production, the mechanical properties of the substrate are usually used to replace the mechanical properties of the color coated plate, and the color coating process may cause the mechanical properties of the substrate to change. In addition, the mechanical properties may also change with the storage time. All these will increase the possibility of Rudes tapes or creases during the forming process of color-coated sheets, which should be noted.
3.2 The type of substrate and the weight of the plating layer are mainly selected according to the use, the corrosiveness of the use environment, the service life and the durability. Anti-corrosion is one of the main functions of color-coated panels. The type of substrate and the weight of plating are the main factors that affect the corrosion resistance of color-coated panels. The color-coated panels for building are usually made of hot-dip galvanized and hot-dip aluminum-zinc alloy substrates. The corrosion resistance of these two substrates is good. Plating weight should be determined according to the corrosivity of the use environment. In corrosive environments, substrates with good corrosion resistance and high plating weight should be used to ensure the specified service life and durability. In addition, when selecting the substrate, attention should also be paid to the difference in the corrosion resistance of the various substrate incisions.
4 front coating performance selection
4.1 Front coating performance selection mainly refers to the type of coating, coating thickness, coating color, coating gloss, coating hardness, coating flexibility / adhesion, coating durability and other performance options.
4.2 Coating Type
4.2.1 Finishing
Commonly used topcoats are polyester, silicon modified polyester, high durability polyester and polyvinylidene fluoride, and there are certain differences in hardness, flexibility/adhesion, and durability of different finishes. Polyester is currently the largest coating used, durability is generally, the hardness and flexibility of the coating is good, and the price is moderate. Silicon-modified polyesters are modified with silicones to improve the durability, gloss, and color retention, but the flexibility of coatings is reduced. High-durability polyesters have both the advantages of polyesters and have improved durability, resulting in higher cost performance. Polyvinylidene fluoride has excellent durability and good flexibility of the coating, but the hardness is relatively low, the available color is also less, and the price is expensive. Detailed performance indicators for various topcoats can refer to relevant information or consult experts.
The top coat is mainly determined according to the use, the corrosivity of the use environment, the service life, the durability, the processing method and the degree of deformation.
4.2.2 Primer
Commonly used primers are epoxy, polyester, and polyurethane. There are certain differences in the adhesion, flexibility, and corrosion resistance of different primers. Epoxy has good adhesion to the substrate and high corrosion resistance, but it is not as flexible as other primers. The polyester has good binding force with the substrate and excellent flexibility, but the corrosion resistance is not as good as that of the epoxy. Polyurethane is a primer with better overall performance. Detailed performance indicators for various primers can refer to relevant information or consult experts. The primer is usually selected by the supplier according to the production process, the use, the corrosivity of the use environment and the matching relationship with the top coat.
4.3 Coating thickness
The thickness of the coating is closely related to the corrosion resistance of the color-coated board. Corrosion resistance generally increases as the thickness of the coating increases. Ordering should be based on factors such as corrosivity, service life, and durability of the use environment to determine the appropriateness. Coating thickness.
4.4 Coating color difference
Color coating may occur during production and use. Chromatic aberration is affected by various factors such as production organization, color depth, use time, use environment, and use. Therefore, both supply and demand parties usually negotiate when ordering.
4.5 Coated gloss
The gloss of the coating is mainly selected according to the use and usage habits. For example, the color coated board for building is usually selected for medium and low gloss, and the household electric color board is usually selected for high gloss.
4.6 coating hardness
The hardness of the coating is the ability of the coating to resist scratching, scratching, collision, and press-in. It is closely related to the scratch resistance, abrasion resistance, and indentation resistance of color-coated sheets. The main basis Use, processing methods, storage and transportation conditions and other factors to choose.
4.7 Coating Flexibility/Adhesion
The flexibility/adhesion of the coating is closely related to the processability of the color-coated sheet, and the selection is mainly based on the processing method and the degree of deformation. When the deformation speed is high and the degree of deformation is large, color coated plates with a high impact energy and a small T-bend value should be selected.
4.8 Coating durability
Coating durability is the performance of the color coated plate during use, which is usually measured by the length of service life. The durability of the coating is closely related to the type of coating, the thickness of the coating, and the corrosivity of the use environment. Atmospheric exposure test is a reliable method for evaluating coating durability. However, atmospheric exposure test has many problems, such as long test time, high test cost, and difficult management. Therefore, it is mainly used for basic research and scientific research. In order to meet the needs of production, acceptance, etc., people have developed a series of artificial aging tests to evaluate the durability, of which the most commonly used are neutral salt spray test and ultraviolet accelerated aging test. The former mainly evaluates the coating's resistance to chloride ion corrosion, while the latter mainly evaluates the coating's ability to withstand light (especially ultraviolet light) aging. In addition, color-coated panels may be used in special environments such as acid rain and moisture, and corresponding artificial aging tests should also be selected for evaluation. It should be noted that since the artificial weathering test usually cannot fully simulate the actual use environment, it is very difficult to determine the direct and exact correspondence between the artificial weathering test results and the actual service life.
4.9 Other performance
Some use environments require the color coated board to have good resistance to organic solvents, acid and alkali resistance, pollution resistance and other properties, for these special properties should be given sufficient attention to meet the requirements of use.
5 Choice of Reverse Coating Performance
The performance of the reverse coating is usually selected by the supplier according to the use and the use environment. When the corrosiveness of the use environment is not high, the reverse side is usually coated only one layer, and it mainly plays a decorative role. If the insulation material is attached to the reverse side, it should be stated at the time of ordering so that the supplier can apply the paint with good performance on the reverse side. When the corrosive environment of use is high, two layers are applied to improve the corrosion resistance.
How to choose color coated board
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