Burning class I vertical combustion method average burning time average burning height n-level horizontal combustion method average burning time average burning height breaking elongation rate 6% closed cell rate water absorption rate water vapor permeability PUR is based on isocyanate and polydip. Under the action of various additives such as foaming agent, catalyst, flame retardant, modifier, anti-aging agent, etc., it is fully mixed by special equipment, and it is formed by high-pressure spraying and on-site foaming. It is a new type of waterproof and thermal insulation material integrating waterproof, heat insulation and heat preservation.
In the PUR production process, as the polyether polyol and polyisocyanate polymerize and the chain extension reaction proceeds, the molecular weight continues to increase, and the blowing agent in the tank rapidly vaporizes under the action of the reaction heat and is released in the reaction. Together with the CO 2 gas, a large number of nucleation nucleuses are continuously generated in the liquid tank, and the foaming agent balances the nucleation rate and the bubble growth rate in a timely manner, and gels to form a polyurethane rigid foam in the final stage of the reaction.
In actual production, the forming of PUR mainly relies on rolling (low pressure) casting spray foaming equipment for foam molding.
The structure of waterproofing and heat preservation of building roofs using PUR is shown in the figure.
Energy-saving design requirements can be achieved by directly spraying (3-5 cm) thick PUR on the roof base. Since PUR has good water impermeability and high water vapor permeability, it is generally not necessary to separately provide a vapor barrier layer, and it is not necessary to lay a waterproof coil layer outside the hard foam, but a reliable protective layer should be provided. . There are two specific ways to protect the protective layer. One is that it is not covered with a protective layer on the roof. It is usually coated with a waterproof and UV-resistant polymer waterproof coating on the surface of the PUR. The other is the roofing protection layer of the upper man, laying 3cm thick 1:2 cement mortar on the PUR surface layer.
A large amount of heat inside the building is radiated through the wall. PUR's super-self-adhesive ability and on-site spraying process can firmly bond the entire structure of the building to a seamless waterproof insulation layer, completely eliminating the "hot section". And the "cold season", combined with the excellent waterproof performance of the material itself, fundamentally eliminates the phenomenon of wall flooding. PUR has developed a new exterior insulation system for the Chinese construction industry that is superior in performance, safe, reliable and economical.
The construction steps for waterproofing and insulation of the exterior wall of the building using PUR are as follows: the hole in the wall is blocked, and the floating dust on the wall is blown off with compressed air; the thickness of the wall is sprayed to the wall with a high pressure spray foaming machine of 2530 mm. The thickness of the PUR can be controlled by the dotted line method. After the spraying is completed, the local area is polished and leveled: after grinding and leveling, the plastic swells and hangs the thin wire mesh of hnm, and the brush is pressed. After proportioning the good cement mortar (the cement mortar is composed of cement, construction glue and water), the wall decoration work can be carried out; for example: 4, the wall decoration material can be mixed mortar, cement mortar, etc., also in the wall Other whitewashing constructions are carried out on the surface.
1. Advantages of application in building roofing Unique water-impermeable PUR is a kind of high-strength interconnected wall microporous foam material with a closed cell ratio of more than 95%. It has smooth and compact self-skinning and is an excellent impervious material. . The on-site direct spraying technology is used to make the PUR form an integral impervious layer without seams, which fundamentally eliminates the possibility of roof water infiltrating along the gap.
PUR can be firmly bonded to the roof base layer, and its excellent self-adhesive strength exceeds the tear strength of the material itself, so that the PUR and the roof base layer are firmly integrated to avoid the penetration of the roof water along the interlayer gap.
The PUR on-site spraying process is a molding technique that directly converts liquefied raw materials into solid materials. The liquid raw material has fluidity and permeability, and under the action of the spraying pressure, it is easy to enter into the void of the roof base layer to expand and foam, and to seal the gap.
The above characteristics are not available in many other traditional waterproof materials, so the waterproof function of PUR is obvious and unique.
Good thermal insulation properties PUR has a low thermal conductivity and good thermal insulation, which is unmatched by any other roof insulation.
Table 2 Comparison of thermal insulation properties of PUR and other building materials. Material name Thermal conductivity (w/mk) Contrast value Same thickness of insulation layer under heat transfer conditions 伫 Polystyrene extruded board PVC foam board adopts RR The thickness of CMFUR is one-sixth of the average twist of other materials. The thermal resistance of glass fiber is that the other material cement slag cotton material average softwood six times cattle felt 54 coffee ordinary bricks are visible in Table 2, in general residence PUR is used as a waterproof insulation layer in buildings. Its thickness is only one-sixth of the thickness of traditional materials, and its thermal resistance is six times higher.
The light load on the roof is small and the weight is light, so the load on the roof is also light. Compared with the traditional materials, see Table 3: Table 3: Roof load with different insulation materials, roof structure, roof material load (kg/m2) Cement perlite cement vermiculite three felt four oil one sand waterproof layer cement mortar protection house insulation layer using PUR roof load is one-half of other materials cold bottom oil vapor barrier layer cement mortar leveling layer total can be seen from Table 3, in Among the loads above the roof support plate, the roof using PUR is one-half of the roof load using traditional materials, which is of great significance for improving the overall structure of the house and reducing the cost of the house. At the same time, due to its low density and light material, the vibration absorption effect is good. It has strong sound insulation performance, especially suitable for waterproof and thermal insulation of large-span thin-shell steel structure roof. In the harsh winter of dripping water into ice in the north, it can ensure that there is no condensation inside the building and no dripping.
Although the unit price of PUR is higher than that of other traditional insulation materials, because the material has the functions of heat preservation, waterproof and steam separation, the waterproofing layer, the vapor barrier layer, the insulation layer and the leveling layer are omitted after the roof is made of PUR. The cost of the entire roof is lower than the cost of roofing construction with traditional materials. Table 4 is a comprehensive comparison of the cost of roofing using PUR and other traditional materials: Table 4PUR and other building materials roofing cost comparison table oblique ant ┘匪 ┘匪 è‚‹ çç çç çç çç çç çç çç 对比 对比 对比 对比 对比 对比 对比 对比Compared with other materials, the total cost is reduced by one-half cement mortar protective layer (2cm thick 1:3 cement sand) insulation layer and waterproof vent hole cement mortar leveling layer (3cm thick 1:3 cement sand) roofing total cost can be obtained from Table 4 It was found that if the roof was made of PUR, the total cost did not increase and decreased by one-half compared with the traditional roofing method.
2, the outer wall of a building advantage wall surface coating applications PUR, with conventional rock (rock) cotton as compared to the batch wall insulation, the non-absorbent material, impervious to solve the leakage problem wall; with conventional Compared with the method of sandwiching the polystyrene foam board, the local heat bridge heat transfer problem of the wall is solved; the outer surface of the wall is sprayed with a PUR of 25-30 mm thick, which is compared with other wall insulation materials, while meeting the wall insulation. The actual use of the face is increased, the building load is reduced, and the leakage of the outer wall is effectively prevented.
Mobile PUR foam engine, air compressor, 380V power supply, pistol spray gun, blowtorch, measuring cup, drum.
The temperature is preferably 1S-3SC, the wind speed is not more than 3m/s, and the relative humidity is not less than 85%. The surface of the base should be firm, smooth and dry. The gravel, debris, dust and oil on the base layer must be removed. The prefabricated plate should be filled with the gap between the two plates; the base layer with the separation joint is elastic compensation method.
3. Pipes, equipment and embedded parts that pass through the roof should be sprayed and installed in the PUR layer. 4. The construction operation equipment is connected to the power supply at the site to check the operation.
Inject the A and B materials into the respective barrels to recycle the materials, check for leaks and blockages, and carefully filter them when feeding.
Calibration meter 1: system flow, the A and B materials are adjusted according to the ratio of 丨: (1.0-1.1), the proportional error is not more than 4%. When spraying, the air compressor should be started and the compressed air switch should be turned on, then the foaming should be started. The machine and material pump must be tested first every time. Because of the different viscosity of the A material and the bucket, the mixing of the two materials A and B may occur at the beginning. After the yellow liquid is sprayed, the formality begins. Spraying operation.
The dust on the roof base is cleaned with compressed air before spraying to ensure good adhesion between the PUR and the base layer.
Roof from the lance (face) 0.6ni, the gun moving speed should be uniform, generally twice spraying each coating thickness of not more than 10mm. Compressed air during spraying can not be interrupted, the construction of a batch, the first stop pumping material to be tube After the material in the middle is blown off, the air compressor is stopped.
Check the foam quality at any time, the appearance flatness (the error should not be greater than 5mm), no problems with delamination and blemishes, and should be stopped in time and for obvious reasons.
After the spraying operation is completed, the material pump should be turned off first, and the material remaining in the material tube should be blown off with compressed air, and then the parts of the spray gun should be washed in acetone. While ensuring that the pump isolated from the outside air. The method is to first remove the spray gun from the feeding pipe, and then insert the two material pipes into the respective liquid tanks below the liquid level to cover the material tank. Under normal circumstances, 3-5d thoroughly cleaned once material pump.
In the spraying operation, a 500X500mm test block of the same thickness shall be sprayed for the performance test of the material.
Regarding the node approach, the following approach can be adopted: the drainage slope of the flat layer should not be less than 2%, and the longitudinal drainage slope of the gutter trench should not be less than 1%. The corners of the protruding parts such as the roof and the gable, the daughter wall, and the nozzle should be round. Arc shape, its arc radius (R) should not be equipped with a drip line on the inner side of the wall and the daughter wall. PUR should be sprayed to the lower part of the drip line. The above parts of the drip line should also have reliable waterproof measures.
The protective layer is to find the slope exhibition or the screed roof structure roof gable, the paradise wall of the parapet water, and the unorganized drainage mouth. The PUR should be continuously sprayed from the head to the flat end of the cornice. The thickness of the spray should be gradually reduced to not less than 2Smm. The structure of the gutters and gutter joints should continue to spray the water sprinklers in accordance with the following regulations: unstructured drainage, gutters, gutters, waterproof insulation layer A, slopes around the straight drop should not be less than 2%. (For example, a) B. The horizontal water inlet should be set on the gable and the wall of the daughter according to the requirements of the flood height. The PUR should be sprayed directly into the water drop cup. (, b) Protect the irrigation slope or level the surface of the cliff, and the b-shaped horizontal outlets shall extend continuously to the roof and shall be sprayed continuously according to the flooding requirements. (: Protection fee screen to find the slope or leveling surface structure nightmare Po projecting roof flashings to close the first conduit entrance vertical roof coating should be continuous, close to the lower pressure head level roof panel joints â‘© 0.05 Base ruled joints, along the seam to be After paving a waterproof strip with a width of not less than 300mm, spray the PUR directly. (1) The split joint of PUR should be set at the joint seam of the base layer, and the seam should be sealed with high elastic sealing material. (2 According to design requirements Do a good job of protecting the house.
Low-cost and low-cost "Xiangrong" PUR-spray modified polyurethane rigid foam waterproof insulation material with excellent water resistance, excellent thermal insulation, extraordinary crack resistance, good flame retardancy, extraordinary durability, outstanding mortgage wind and high-quality environmental protection, in the construction sector will have broad market prospects, it applies to concrete structures, civil roofing metal structure, wooden structure and exterior waterproofing insulation system .
(Finish)
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