After the application of polyurethane rigid foam spraying in engineering cases, although there are still many areas to be improved, the advantages of this technology are very obvious.
1. Good heat preservation efficiency
The rigid foam sprayed polyurethane is a high content thermosetting polymer, which is excellent Thermal insulation material Its thermal conductivity is 0.015~0.025W/(m · k). Permanent mechanical anchorage, temporary fixation, through wall pipes, or the fixation of attachments on external walls often cause local thermal bridges Polyurethane spraying Process, because the rigid foam is sprayed with polyurethane and Generally, the wall materials have high bonding strength, and do not need any adhesives and anchors. They are natural Adhesive material It can form a continuous insulation layer to ensure the joint action of insulation materials and walls and effectively block the thermal bridge. 2. Strong stability
Rigid foam polyurethane spraying The solid combination with the base wall is the basic premise to ensure the stability of the external insulation layer. For the wall, its surface should be treated with interface treatment. If the surface layer is loose and hollowed, it must be carefully cleaned to ensure that the rigid foam polyurethane spraying insulation layer is closely combined with the wall. The rigid foam polyurethane spraying external insulation system shall be able to resist the combined effect of the following factors, that is, under the most unfavorable local temperature and humidity conditions, the insulation layer shall not separate from the base course bottom, fall off, and remain stable in the wet state under the combined load of wind, dead weight, normal collision and other internal and external loads. 3. Good fire resistance
Although hard vesicles Polyurethane spray insulation The layer is located outside the exterior wall, and the fire prevention treatment cannot be ignored. After adding flame retardant, polyurethane is a kind of fire-resistant and self extinguishing material Rubber powder polystyrene particles The slurry is compounded to form a fire prevention system, which can effectively prevent the spread of fire. The wall surface of the building and the side of the door and window are all tightly covered with fireproof adhesive polyphenyl granule material, without open parts. The use of thick adhesive polyphenyl granule waterproof plastering surface is conducive to improving the fire resistance of the insulation layer. 4. Excellent moisture and heat resistance
(1) Good water tightness
Rigid vesicle Polyurethane material It has excellent waterproof and vapor isolation performance. The material does not contain water, and its water absorption rate is very low. It can well block the penetration of water and steam, and keep the wall in a good and stable thermal insulation condition Thermal insulation material It's hard to achieve. Rigid foam polyurethane spraying The surface of the external thermal insulation wall is tight without joints, around the holes, around the door and window openings, etc., so that it has good waterproof performance and avoids the danger caused by rainwater entering the interior. The practice of many foreign projects has proved that there are gaps in the surface layer or in the surface layer that absorb water, and it is vulnerable to freezing damage in the case of rain infiltration and severe cold. (2) No condensation in the wall
Condensation inside the wall or the insulation layer is harmful. During the drying process of the new wall or in winter, when the water vapor with high indoor temperature moves to the outside, due to the barrier of rigid polyurethane foam, it is impossible to condensation inside the wall. When the indoor humidity is low and the indoor wall is well insulated, it can also avoid the condensation caused by the moisture migration of water vapor in the wall.
(3) Be able to withstand the most severe local climate and its changes
No matter the climate is high or cold, the external insulation system will not be irreversibly damaged or deformed. The external surface temperature of the external wall will not be damaged by drastic changes (up to 50 degrees), such as sudden rain shower after a long time of exposure, or shading after exposure, when the temperature difference similar to the above is generated, the external wall surface will not be damaged. In this way, the surface deformation caused by the change of surface temperature can be avoided, which will lead to cracks on the surface.
5. Impact resistance is superior to EPS, etc Thermal insulation material Rigid foam polyurethane is a material with high strength ratio (material strength to bulk density ratio). As a thermal insulation material, its performance is better than that of foamed polystyrene, rock brocade and other materials, and its resistance to external forces is also strong.
Rigid foam polyurethane spraying reunite with Rubber powder polystyrene particles The external thermal insulation system of the external wall can withstand the collision caused by normal human body and moving objects, and will not cause damage to the external thermal insulation system in case of general collision. When air conditioners are installed on them or maintenance facilities are placed by conventional methods, the surface layer will not crack or pierce. 6. Strong adaptability to deformation of main structure and good crack resistance
Polyurethane is a kind of material with large flexible deformation, which has strong resistance to external deformation, deformation under external force, temperature, dry temperature, etc
1. Product features
(1) Hard foam polyurethane has good heat preservation effect. Rigid foam polyurethane is an excellent Thermal insulation material Its thermal conductivity is 0.024W/(m · K); Spray to form a continuous insulation layer, ensuring the integrity of the insulation material and the wall and effectively blocking the thermal bridge. (2) Polyurethane insulation and Rubber powder polystyrene particles Double insulation effect. The two are compounded together through interfacial agent to play their respective functions. The excellent protective performance of the fireproof and breathable transition layer of the rubber powder polyphenylene particles. Rubber powder polyphenylene granule slurry contains a large amount of Inorganic materials After being compounded on the surface of polyurethane rigid foam insulation layer, it can not only play a very good leveling role, but also can Polyurethane insulation layer Protection function: effectively prevent the aging effect of ultraviolet ray on polyurethane layer; Make up for on-site spraying Polyurethane insulation material Deficiencies in local parts, such as doors and windows, avoid thermal bridges, and enhance the insulation effect of the system; It conforms to the anti cracking technical route of flexible gradual stress release layer by layer, which can effectively prevent cracks in the protective surface, and improve the stability and durability of the system; Reducing the thickness of polyurethane insulation layer can save project cost and reduce cost; Effectively block the influence of fire source on rigid polyurethane insulation layer. (3) No cavity structure, strong wind pressure resistance. The sprayed rigid foam polyurethane insulation layer is firmly combined with the base wall to form an organic whole with no joints and cavities, reducing the wind pressure, especially the negative wind pressure, on high-rise buildings External thermal insulation system of external wall Destruction of. (4) Excellent moisture and heat resistance and waterproof performance. Rigid foam polyurethane has excellent thermal insulation performance and unique water impermeability, which truly combines the two functions of waterproof and insulation, and can be completed at one time during construction. It can replace the traditional waterproof layer and insulation layer and be widely used in roof and wall insulation.
(5) Excellent fire resistance. Polyurethane is a flame retardant and self extinguishing material. The polyurethane surface and the side of the door and window are all of B1 Rubber powder polystyrene particles The slurry is tightly coated. When encountering fire and heat, the heat transfer to the interior is small and slow. The heat concentrated on the surface of the adhesive powder polyphenylene particle slurry layer is conducive to improving the fire resistance of the insulation layer. (6) It has good construction performance. Rigid foam polyurethane spraying Mechanized operation is adopted, with fast construction speed and high efficiency. In order to ensure the straightness of the line angle at the leg opening of the internal and external corners, it is advisable to paste polyurethane precast blocks, which can reduce the material loss, facilitate the subsequent process to make the internal and external corners and edge openings straight, and improve the overall construction quality and efficiency. (7) Good environmental protection. Thermal insulation material itself chemical stability High, fluorine free products are used. 2. Material composition
(1) Thermal insulation material
① Rigid polyurethane foam (main insulation layer): solvent-free polyurethane rigid foam insulation material
② Rubber powder polyphenyl granule slurry (auxiliary insulation layer) shall meet the requirements of Technical Specification for Rigid Foam Polyurethane External Insulation Engineering and Rubber powder polyphenyl granule external wall external insulation system.
(2) Base course interface mortar Anti crack mortar 、 Hot dip galvanized steel wire mesh (or glass fiber cloth), nylon expansion bolt, polyurethane preform adhesive, putty, coating, facing brick bonding mortar, facing brick pointing material, facing brick and other performance indicators shall meet the requirements of relevant standards. 3. Usage
(1) Finishes Coating construction technology Base course wall cleaning - spraying thickness control line with nylon fishing line hanging PU - pasting and anchoring polyurethane prefabricated parts - shielding of doors and windows, etc. - spraying hard foam polyurethane Thermal insulation material ——Post coating interface agent - hanging the vertical line of the big wall - plastering Rubber powder polyphenylene granule insulation slurry ——Dividing the grid line, opening the color band, dividing the slot, door, window drip tank - plastering anti crack mortar, paving and pressing the grid cloth - installing steel corner protection at the external corner of the first layer of wall, plastering the second layer of anti crack mortar, pressing into the second layer Glass fiber gridding cloth ——Brushing polymer emulsion elastic primer - scraping flexible water resistant putty—— Exterior wall coating Construction. (2) Construction technology of facing brick
Base course wall cleaning - nail shooting (anchoring expansion bolt) - spraying thickness control line with nylon fishing line crane - spraying rigid foam polyurethane Thermal insulation material ——Brush interface agent - hang the vertical line of the big wall - plaster Rubber powder polyphenylene granule insulation slurry ——Binding Hot dip galvanized steel wire mesh ——Apply adhesive powder polyphenyl granule thermal insulation mortar - stick face bricks on the exterior wall - pointing. 
