What is the difference between aluminum-plastic panels for curtain walls and aluminum-plastic panels for outdoor signs?

(Summary description)Aluminum-plastic composite panel is a new type of building decoration material, which has the advantages of light weight, good rigidity, smooth surface, rich and colorful colors, convenient construction, etc. It is widely used in curtain walls, indoor and outdoor decoration and advertising signs, etc. It is a reflection of modern architecture And important decorative materials of decorative style.

What is the difference between aluminum-plastic panels for curtain walls and aluminum-plastic panels for outdoor signs?

(Summary description)Aluminum-plastic composite panel is a new type of building decoration material, which has the advantages of light weight, good rigidity, smooth surface, rich and colorful colors, convenient construction, etc. It is widely used in curtain walls, indoor and outdoor decoration and advertising signs, etc. It is a reflection of modern architecture And important decorative materials of decorative style.

详情
Aluminum-plastic composite panel is a new type of building decoration material, which has the advantages of light weight, good rigidity, smooth surface, rich and colorful colors, convenient construction, etc. It is widely used in curtain walls, indoor and outdoor decoration and advertising signs, etc. It is a reflection of modern architecture And important decorative materials of decorative style.

Aluminum-plastic composite board is a kind of board composed of aluminum and plastic. Specifically, the aluminum board and the plastic core layer are bonded and compounded by a polymer bonding material under certain process conditions. It is a "sandwich" type. Structure of the plate. In actual production, the front and back aluminum plates used as panels are generally coated with decorative and protective coatings.

From the perspective of the material structure of the aluminum-plastic composite board, its service life has a decisive relationship with the selection of raw materials and production processes. The selection of raw materials and the process control of the production process are the key factors that determine the service life of the aluminum-plastic composite board, such as fluorine Coating of carbon coating, selection of LDPE material, selection of aluminum material, etc., as well as aluminum plate formation treatment, baking temperature control, composite pressure and temperature correspondence required in the production process.

  The following focuses on the analysis of the differences between aluminum-plastic panels for curtain walls and outdoor and logo aluminum-plastic panels from the perspective of the composition and process control of aluminum-plastic panels.

   1. Application of fluorocarbon resin

As we all know, fluorocarbon coatings with superior weather resistance and durability, corrosion resistance, and stick resistance are widely used in outdoor building curtain walls. The fluorocarbon resin content in fluorocarbon paint is required in aluminum-plastic panels for curtain walls. (Polyvinylidene fluoride) must be equal to or higher than 70%. Only in this way can the quality of the fluorocarbon coating and the long-lasting appearance of the building exterior be ensured. However, due to the fierce competition in the market, some coatings with low fluorine content and low price came into being. In the short term, although this type of coating is not much different from HYLAR5000 or KYNAR500 PVDF coatings in appearance, with the extension of use time, their weather resistance can not compete with HYLAR5000 and KYNAR500 PVDF coatings, and the appearance of building exteriors is maintained. Time and life will also be shortened. Therefore, when choosing a fluorocarbon coating manufacturer, it is recommended to choose a coating company with a large brand and a large output, such as PPG in the United States and Beckers in Sweden. Because they can be adequately guaranteed in terms of quality stability and process guidance.

   On the other hand, the coating process of fluorocarbon coating is the key factor to determine whether the performance of fluorocarbon coating can be guaranteed in all aspects. The processing technology of fluorocarbon coating needs to be baked at high temperature, and under certain temperature conditions, its performance in all aspects can reach its best state. If the required process temperature is not reached in the production process, the performance of all aspects will be greatly reduced, and even worse than other types of coatings, such as polyester coatings. Some production companies choose aluminum materials that do not meet the requirements for curtain walls, such as 1××× series, from the cost considerations, so that they have to reduce the baking temperature to meet the board type requirements, which greatly reduces the coating performance. After comparing and analyzing the performance of fluorocarbon panels of different manufacturers, it is found that they are also fluorocarbon curtain wall panels, but the performance of each aspect is very different. From the coating performance point of view, good fluorocarbon coatings can achieve more than 5,000 solvent wiping and T bending performance ≤ 2T, while poor fluorocarbon plates have only 1,000 solvent wiping, some less than 500, which is equivalent At the level of some polyester coatings. If the process requirements are not met, the chemical resistance of the coating, such as acid resistance and alkali resistance, is difficult to meet the requirements, and it is impossible to pass the 4000-hour weather resistance test.

  The use of aluminum-plastic plates for signage determines that it does not require high weather resistance requirements for the coating, so most of the coatings are selected from polyester and other coatings, and their performance is far lower than that of fluorocarbon coatings.

   Second, the difference of PE core material

Aluminum-plastic composite panels generally use high-pressure low-density polyethylene resin (LDPE) as the core material. Its mechanical properties, anti-aging properties, moderate toughness and bending properties have an overall performance on aluminum-plastic composite panels (especially aluminum-plastic panels for curtain walls). Has a major impact.

In the process of using aluminum-plastic composite board, it is required to have good processing properties such as hemming, bending, and slotting. Therefore, when selecting PE core material, the requirements for PE should be stable performance, moderate melt index, and fracture extension. Raw materials with better growth rate. According to the different use scope of the product, the melt index is generally required to be 0.4ˉ2.0g/10min, the aluminum-plastic panel for curtain wall is preferably 0.4ˉ0.8g/10min, and the elongation at break should be greater than 400%. Because the core material for LDPE with suitable melt index is adopted, the surface of the aluminum-plastic composite board has good strength and high flatness. Larger blocks can be used in engineering design. For example, the use of LDPE with too large melt index is not only difficult to process. The shape is fixed, and the strength of the plate after molding is also low, which is only suitable for the use of smaller blocks in engineering design. In the production process, if the LDPE with a large melt index is selected, it is easy to be excessively softened under high temperature conditions, and it cannot guarantee sufficient compound pressure. Only the method of reducing the process temperature and the use of a low-melting polymer adhesive film can be used. It will lead to a decrease in the peel strength of the bonding force between aluminum and plastic, so some products are extremely improper to lower the production temperature to ensure the flatness of the surface and sacrifice the peel strength. The experiment proves that the seasonal temperature difference of the aluminum-plastic board for curtain wall in actual use can reach -30° to more than 60°. Such a large temperature difference is easy to make the aluminum-plastic composite board gradual. If the initial peel strength is not high or the PE core material is softened If the point is too low, the application of aluminum-plastic composite panels on the curtain wall will have major quality risks.

   At present, there are a large number of recycled materials used in the production of aluminum-plastic composite panels. Most of these recycled materials have been recycled many times. The internal structure of the material is greatly damaged and the degradation between the molecules is serious. Generally, the recycled material has unstable melt index, large and small, and elongation at break is about 100%. Therefore, the processed plate has poor flatness, many small pits on the surface, and the plate is easy to break. Th