Sandwich panel for cold room in the industry are also known as "insulation materials", the main question asked, "what is the best material for cold storage insulation"?
As for the answer to this question, Yuyan refrigeration believes that the different construction areas and environments of the cold storage require special insulation materials. Therefore, the appropriate sandwich panel for cold room in different environments is the "best material".
What is insulation? The so-called thermal insulation material generally refers to the material whose thermal coefficient is less than or equal to 0.12. Common thermal insulation materials are soft porcelain insulation, aluminum silicate insulation, phenolic foam materials, expanded vitrified microspheres, rubber powder polystyrene particles, extruded panels, polystyrene boards, rubber plastic insulation materials, loose insulation materials (glass wool insulation, rock wool insulation felt), porous thermal insulation materials (foaming cement). Understand the basic knowledge of thermal insulation materials, and then say the thermal insulation materials used in the cold storage. What insulation materials are commonly used in refrigerators? Time goes back to the last century, just before 1980: the thermal insulation materials used in refrigerators at that time were not so mature as they are now, and of course, they were also linked to the technological level at that time. At that time, common thermal insulation materials were rice husk, cork, slag, and expanded perlite.
After 1980: new environmentally-friendly materials began to flourish, such as rock wool, glass cotton, polystyrene foam (EPS, XSP), and polyurethane foam were widely used, but also derived from a variety of construction methods.
The widely used thermal insulation materials in the cold storage market are polyurethane foam, polystyrene foam, extruded polystyrene foam, glass fiber, and other materials. The following details of these insulation materials.
1. PVC foam plastics
The bubble structure of PVC foam is a closed-cell foam material, and there is hardly any connection between pores.
The static water absorption at room temperature is very low. The advantages of rigid PVC foam plastics are low thermal conductivity, low water absorption, high compression, and high durability. The disadvantages of rigid PVC foam are high prices.
What are the applications of polyurethane in cold storage? There are two kinds of polyurethane applications in cold storage: Polyurethane field painting and polyurethane sandwich insulation board. First of all, polyurethane spraying: Polyurethane spraying is mainly used for layered spraying of on-site heat preservation, the effect can be achieved is closed without joints, and the heat preservation effect is better. However, the use of spray coating requires a damp proof layer and protective layer, the damp proof layer is made of polymer waterproof coating, and the protective layer is maintained in the form of civil engineering or metal plate.
There is also a polyurethane sandwich panel, which is a light high, fast installation, and shorter construction cycle compared with polyurethane spraying. There is no need to make a protective layer, and the appearance of the polyurethane sandwich panel is higher.
2. Polystyrene foam (EPS)
The base material of polystyrene is mainly resin, supplemented by foaming agent (scientific name is butane or pentane), which is heated by water vapor to form a small foaming ball with numerous tiny bubbles, which is cooked under normal temperature and pressure. This process is called pre foaming. The cooked foam balls are placed in the mold to heat them so that they can be fused together to form a rigid foam plastic with a tiny closed-cell structure.
The characteristics of foam plastics are: lightweight, good heat insulation, low-temperature resistance, acid and alkali resistance, and some elastic products can be cut. The practical application in recent years shows that the use of polystyrene foam in cold storage is easy to absorb water and affects the heat insulation effect. Therefore, moisture-proof and waterproof treatment should be done well when using.
3. Extruded polystyrene foam (XPS)
The extruded PVC has a dense surface layer and a closed-cell structure inner layer. Under the same thickness: the thermal conductivity is lower than that of polystyrene, and the thermal insulation is better. In addition, extruded polystyrene has good moisture resistance and can keep excellent heat insulation in a humid environment.
Internationally, extruded PVC is considered as "the ideal material for cold storage and heat insulation engineering", characterized by high compression strength, long service life, and high-cost performance. It is widely used for sandwich panel for cold room.