Views:18 Author:Site Editor Publish Time: 2020-08-12 Origin:Site
At present, the total global output of polyurethane has exceeded 10 million tons per year, with an average annual growth rate of 4.4% in production capacity and an average annual growth rate of 3.4% in consumption. As the largest production base and consumer market in the polyurethane industry in Asia, China has a consumption growth rate of about 20%. It can be seen that in the future application of building energy saving, the application prospect of polyhelium ester rigid foam is quite broad. As one of the most excellent insulation materials in the current insulation and energy-saving market, polyurethane rigid foam products are increasingly used in building energy-saving insulation. Studies have shown that polyurethane products account for 50% of the global building materials application field. About 49% of building insulation materials in developed countries such as Europe and the United States are polyurethane materials. In my country, this proportion is still less than 10%.
Rigid polyurethane foam has excellent thermal properties, and its thermal conductivity is lower than that of air, which is incomparable to the thermal insulation materials commonly used in engineering. Therefore, if rigid polyurethane foam is used as an insulation material, the insulation layer of the wall will become thinner, the weight of the building will be reduced, and the living area of the house will increase.
Talk about why polyurethane insulation materials have attracted much attention from the market?
1. Good fire and temperature resistance of polyurethane rigid foam
Although the rigid polyurethane foam is a polymer, it is a thermosetting material. It is inert during combustion and will not produce molten combustible flame drops. Instead, it will form a protective layer of coking. This characteristic effectively inhibits melting. The danger of fire spreading. At the same time, the polyurethane rigid foam can resist splashing sparks and radiant heat, and it can also prevent oxygen from entering the board or the wall insulation layer from contacting the foam core material, so it will not cause the direct combustion of the core material, which can ensure the building's Completeness. At the same time, by adjusting the formula, the polyurethane rigid foam material can fully meet the higher fireproof performance requirements of building insulation materials. Polystyrene foam is a thermoplastic material. When a fire occurs, it will first soften and deform, and then will melt and shrink with combustion, and hot liquid will drip or flow. After burning to a certain degree, the entire insulation structure system will collapse.
2. Excellent self-adhesive properties of polyurethane rigid foam and wall substrate
The polyurethane rigid foam material can be firmly bonded to various materials such as blocks and masonry, and its bonding strength is greater than its own tensile strength, and it can resist wind pressure well. As an external wall insulation system material, it is suitable for a variety of construction methods. During construction, it can make full use of its excellent self-adhesive performance to make the polyurethane rigid foam external insulation facing system better integrate with the external wall. Save materials and labor losses.
3. Excellent mechanical properties and processing properties of rigid polyurethane foam
Polyurethane rigid foam has excellent physical and mechanical properties. It is light in weight, has high compressive strength and shear strength. It is a hydrophobic material with a closed cell rate of more than 90%. It has excellent moisture resistance, waterproof, sound insulation and shock resistance. Function; Polyurethane rigid foam has a variety of processing. Different forms of on-site spraying, on-site casting, prefabricated plates, etc. can be selected for design and processing according to different usage methods. In addition, rigid polyurethane foam also has good acoustic properties, electrical properties and resistance. Weak acid, weak alkali and other chemical substances are corroded, non-toxic, non-irritating and non-parasitic.
4. The relatively low cost of rigid polyurethane foam
As a durable consumer product, a building should be considered as a complete and long-term practical system for the cost of applying the external wall insulation system. The price of thermal insulation material is only one part of the cost of thermal insulation system, but also factors such as the number of construction procedures, the difficulty of construction, the consumption of construction consumables, the durability of the project, safety, and the comfort of living. But from the above performance analysis, the comprehensive cost price after applying the polyurethane rigid foam insulation system is very suitable.