XPS insulation board basic knowledge
XPS insulation board basic knowledgeXPS air-conditioning insulation board is an extruded polystyrene heat insulation board. It is made of polystyrene resin plus other raw materials and polymers. It is mixed by heating and injected with a catalyst at the same time, and then extruded and extruded. The rigid foam plastic board. Its scientific name is extruded polystyrene foam for thermal insulation (referred to as XPS). XPS has a perfect closed-cell honeycomb structure. This structure allows XPS board to have extremely low water absorption (hardly Water absorption), low thermal conductivity, high pressure resistance, aging resistance (normally there is almost no aging decomposition phenomenon).
Chinese name extruded polystyrene thermal insulation board, including vacuum layer features high thermal resistance, low linear closed cell rate of more than 99%
table of Contents
1 Performance characteristics
▪ Insulation
▪ High strength compression
▪ Hydrophobic and moisture-proof
▪ Light texture and easy to use
▪ Good stability and corrosion resistance
▪ Product environmental protection
2 Scope of application
3 Construction methods
4 External wall insulation
5 Selection method
Performance characteristics
thermal insulation
It has the characteristics of high thermal resistance, low linearity, and low expansion ratio. Its closed cell rate reaches more than 99%, forming a vacuum layer, avoiding air flow and heat dissipation, and ensuring the durability and stability of its thermal insulation performance, relative to 80% of foamed polyurethane The closed-cell rate, the lead is self-evident. Practice has proved that 20mm thick XPS extruded insulation board, its insulation effect is equivalent to 50mm thick expanded polystyrene, 120mm thick cement perlite. Therefore, this material is the best choice for building insulation.
High strength compression
Due to the special structure of XPS board, its compressive strength is extremely high, and its impact resistance is extremely strong. According to different models and thicknesses of XPS, its compressive strength reaches more than 150～500Kpa, can withstand the ground load of various systems, and is widely used in geothermal engineering, Highways, airport runways, square grounds, large cold storages, interior decoration and insulation, etc.
Hydrophobic, moisture-proof
Water absorption is an important parameter for measuring insulation materials. The insulation performance of the insulation material will decrease after absorbing water. Under low temperature conditions, the inhaled water easily freezes, destroying the structure of the insulation material, thereby reducing the compression resistance and insulation performance of the board. Because the polystyrene molecular structure itself does not absorb water, the sheet molecular structure is stable and there are no gaps, which solves the problems of water leakage, penetration, frost, condensation and other materials.
Light texture and easy to use
The completely closed-cell foaming chemical structure of XPS board and its honeycomb physical structure make it light and high-strength, easy to cut and transport, and not easy to break and easy to install.
Good stability and corrosion resistance
During long-term use, it does not age, decompose, or produce harmful substances. Its chemical properties are extremely stable. It will not degrade due to water absorption and corrosion, and its performance will be reduced. It can still maintain its superior performance in high temperature environments. According to relevant information, XPS extruded insulation board can maintain excellent performance even if it is used for 30 to 40 years, without decomposition or mildew, and without the volatilization of toxic substances.
Product environmental protection
The XPS board has been tested by relevant state departments to have stable chemical properties, non-volatile harmful substances, and no harm to human bodies. The production raw materials use environmentally friendly materials and do not produce any industrial pollution. This product is an environmentally friendly building material.
Scope edit
1. Building roof insulation, steel structure roof, building wall insulation, building floor moisturizing, square floor, ground frost heave control, central air conditioning ventilation ducts, etc.
2. The ground moisture-proof and heat-insulating layer is widely used for the moisture-proof of the bottom of various buildings. The laying of the roadbed, road, and airport runway in the cold area can control the thermal expansion and contraction of the floor tiles, and has excellent structural load-bearing effect.
3. Interior decoration, advertising board, widely used in interior decoration, ceiling, soundproof wall, sandwich door filling material, play the role of heat insulation, sound insulation, moisture retention, weight reduction and so on. The board is added with fire retardant during the production process, so it is not easy to burn. It can also be widely used by advertising companies to produce various types of advertising boards.
Construction method editing
According to the size of the polystyrene board on the construction site, apply or batch scrape the adhesive glue and paste it on the wall.
External wall insulation editor
1. Wall
2. Dry powder construction adhesive
3. The flame-retardant polystyrene rigid foam board adopts high-performance EPS and XPS polystyrene sheets. Liangli products are selected for different customer needs, and the thickness of the products is determined according to the needs of different engineering projects.
4. Dry powder paste
5. High-strength glass fiber mesh cloth can provide the overall strength and impact resistance of the system, while preventing the surface layer of the system from cracking. The number of grid layers can be determined according to the design requirements.
6. The decorative layer is paint, brick and other decorative materials.
Selection method edit
1. Choose high-quality qualified XPS extruded plastic board, generally preferred material: PS original material.
It is characterized by good film formation, large molecular weight, and long molecular chain. During the foaming process, the foam cells form a good film, forming a uniform cell structure, the cell wall structure is thin, and the product has high compressive strength. After pinching the product by hand, it has good resilience. Has a very low thermal conductivity ≤0.030, high-quality sheet is 0.028-0.029 (W/mk), compressive strength is generally ≥200kpa, water absorption ≤0.01, has a high physical stability, the product reaches the national national standard GB/T10801-2002 (Referred to as the standard board) and the flame retardant and self-extinguishing flame extinguishment meets fire protection standards. The reference price is 700-800 yuan/m3.
2. Enterprises with good quality and credit guarantee should be selected.
The inflow of low-quality and low-price XPS in the market has caused industry chaos. Use poor quality recycled materials and use foaming water or flammable propane or butane foaming as blowing agent with low bulk density ≤30kg/m3. Recycled materials, (old materials) undergo multiple high temperature and high pressure and shear Shearing effect, the molecular chain is cut and shortened, the molecular weight is reduced, the hole breaking rate is large, the foaming film formation is poor, the pore formation is poor, the pore wall becomes thicker, the hardness becomes larger, the elasticity is poor, the product service life becomes shorter, the insulation insulation The thermal performance becomes poor. Breaking up small pieces of product by hand, pinching hard and not rebounding, causing problems in product quality, affecting the industry's correct choice and use of XPS, relying on low quality and low price sales without quality and reputation guarantee. Some manufacturers choose to use relatively poor recycled materials that contain impurities. Generally, they are not filtered and used after grinding. The cost is reduced by blindly causing the foam to contain impurities, which cannot reach the foaming ratio and foaming strength. Fire-retardant and flame-retardant are generally not flame-retardant, which is easy to cause hidden dangers and unsafe factors in the project, and can not meet the user's use effect and use standards. The market price is 280-320 yuan/m3.
3. Consider XPS divided by industry grade.
According to the compression strength, water absorption rate and thermal conductivity, different grades of products are selected.
4. Pay attention to the key indicators for the selection of insulation materials.
① Thermal conductivity: due to the selection of different materials, different thermal conductivity is produced. Due to the selection of materials with higher water absorption rate, the thermal conductivity of dry bulk density and wet bulk density differ greatly. High-quality materials are generally 0.028-0.030 (W/m.k) as the selection standard for thermal insulation; 0.038-0.042 (W/m.k) materials generally have large thermal conductivity values and poor energy-saving effects, which cannot reach the 65% energy saving standard.
② Apparent density and compressive strength: The general XPS bulk density is ≥30-38kg/m3, which is the industry standard value, which not only achieves thermal insulation performance but also achieves ideal compressive strength. The difference is that it is not that the heavier or lighter the product, the better, but that the product has a high foaming ratio and good compressive strength, which is one of the ideal product choices.
③ Dimensional change rate: The dimensional change rate comes from the relationship between the material foaming material and the expansion ratio and density. Good products have low dimensional change rate, small shrinkage and strong stability.
④Water vapor permeability coefficient: open pores, semi-open pores and completely closed pores form different moisture absorption rates and different water vapor permeability coefficients.
⑤ Oxygen index and fire protection standard are generally Class A non-combustible materials. Such as rock wool, glass wool, etc.; and organic foam materials, which are generally flame retardant and flame retardant, belong to Class B.
The above five standards are the preferred materials. They pay more attention to the technical parameters. The choice of materials should be based on the quality of the material. Rather than simply pursuing low prices, it is a good product.
5. Selection of flame retardant extruded board with good texture.
The choice of flame-retardant extruded board depends on its density, namely bulk density, bulk density, and uniform pores. First, it can prove that the extruded board has good thermal insulation. Second, it depends on compressive strength, high compressive strength and small bulk density. It is always the perfect combination of extruded board, but unfortunately the two are often difficult to have both, so you can only choose other standards to judge when both standards are met. Third, look at the color, listen to the sound, the texture is white and clean, the color is not changed, the uniform and fine pores of the extruded board are generally made of raw resin, of course, the quality is good, in addition, the quality of the extruded board produced by different recycled materials is also very different, landing Extruded boards that are too brittle and have no strength in the hand are generally of poor quality. Fourth, extruded plastic panels with sufficient size and convenient construction are naturally trusted. Fifth, the flame retardancy test, even a simple lighter can distinguish its flame retardancy if it is rigorously tested.
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