Application of all-water-based soft foamed polyurethane thermal insulation material in building energy saving

Liu Yuequan, Technical Director of China's Health and Energy Company, China, is the main performance indicator of water-based soft foaming 1 urethane. China's residential facilities, water-based soft foaming polyurethane is a new type of green building insulation material. The all-water-based soft foaming polyurethane inherits the performance advantages of low thermal conductivity and jointless thermal bridge of polyurethane series thermal insulation materials. It also has green environmental protection, respirability and elastic deformation with thermal expansion and contraction deformation of building base members. Features. It is especially suitable for the external thermal insulation of curtain wall, hanging board and dry hanging wall system and the thermal insulation and sandwich insulation of various building exterior protection structures. In North America, it has been widely used in exterior insulation, internal insulation and sandwich insulation of enclosures.

I. Water-based soft foaming polyurethane The basic performance of the whole water-based soft foaming polyurethane construction can be carried out by spraying and pouring two construction processes, the density is 8kg / n3. Water-based soft foamed polyurethane 100% water As a foaming agent, its raw material formula fully takes into account the requirements of environmental protection. During the spraying process and after spraying, there is no release of any environmentally harmful substances (such as fluoride, benzene, xylene and formaldehyde). The non-seamless thermal bridge of the soft continuous shell formed after spraying can be wrapped with the surrounding structure of the building. It is a kind of thermal insulation material which combines four functions of thermal insulation, gas barrier, moisture proof and drowning. In line with the current requirements for thermal insulation materials for building thermal insulation renovation projects.

The all-water-based soft foaming polyurethane is carried out by professional construction personnel at the construction site. The two-component raw materials are heated and mixed by special equipment and sprayed onto the surface of the base member or poured into the cavity. The ratio is 1:100 quickly within 30 seconds. The foam expands to form an insulating layer.

1. Example of Wenyuan Building Project of Tongji University Wenyuan Building of Tongji University is located in the main campus of Tongji University. There are three floors above and below, and the main body is reinforced concrete frame structure. Wenyuan Building's exterior design is simple and clear. The rectangular long window structure is almost close to the height of the whole building. It is the first modernist building in China and the only Bauhaus-style historical and cultural building. It is a demonstration project for energy-saving renovation of existing buildings at the 2010 Shanghai World Expo.

In determining the energy-saving retrofit plan, in order to ensure that its façade is not damaged, the designer selected the internal insulation scheme of the wooden keel gypsum board filled with thermal insulation material. The thermal resistance of the wooden keel is better than that of the light steel keel, which can avoid the emergence of a new keel thermal bridge after energy-saving renovation. In order to ensure the continuity of the thermal insulation layer and solve the problem of building and floor thermal bridge caused by the internal thermal insulation scheme, the entire building exterior wall, floor and ceiling are sprayed with continuous thermal insulation layer.

Since the project is to be constructed at an open base level, the spraying process using a full water-based soft foamed polyurethane is selected for construction. At the same time, three sets of spraying construction schemes were formulated for the three different parts of the wall, roof and ground in the project.

Scheme 1: Wall spraying construction scheme As the first modernist style building in China, there are many windows in Wenyuan Building, and the wall area of ​​the south and north facade windows is narrow. The construction angle and pressure must be strictly controlled during construction. Avoid waste and pollution caused by super-foaming of foam.

Clean up the surface of the operation and the oil ash.

Cover the adjacent parts around the work surface with a plastic sheet.

In the corner of the wall, the window is nailed to the slats, and the spraying range is framed to ensure the thickness of the foam sprayed at the corner.

China's high-energy existing buildings have large stocks and individual differences. The energy-saving renovation plan needs to be formulated separately according to the different conditions of each building. If the exterior wall decoration surface of the existing building is good, or the external wall insulation construction is difficult, then the external wall insulation method may be considered to transform the wall into an energy-saving renovation. After using internal thermal insulation, although the retaining structure has certain structural thermal bridge problems, by thickening the thermal insulation layer of the wall, the average heat transfer coefficient of the wall can be reduced below the limit required by the specification. The purpose of energy saving. When determining the materials and construction schemes for internal insulation, we should fully consider environmental protection, durability, blocking the formation of condensate and mildew spots, fire prevention, interior decoration and many other factors, and strive to meet the green, comfortable and energy-saving of building users. And practical requirements.

Set the spray pressure and temperature according to the requirements of the Anjian Energy (All Water-Based Soft Foamed Polyurethane) Construction Manual.

Spray the foam ribs along the longitudinal direction of the wall on the same floor. The thickness of the ribs is the thickness of the designed thermal insulation layer. The spray gun of each rib spacing should be perpendicular to the action surface and sprayed horizontally. Spraying should be done once, and no secondary or refilling is allowed.

The super-spraying part of the foam is smoothed with a hand saw so that the surface of the foam is flush with the outer edge of the wooden keel.

Scheme 2: Roof and ceiling spraying construction scheme When the construction is carried out, the roof and ceiling parts adopt the vertical spray method. When using this method, workers need to spray their heads for a long time. It is more difficult to control the angle and distance of the spray. Incorrect spray angle and distance will affect the adhesion of the foam to the base layer. Therefore, when formulating the plan, it should be fully considered that the method can ensure the bonding of the foam to the base layer.

Clean up the floating surface and oil collapse on the working surface.

Cover the adjacent parts around the work surface with a plastic sheet.

Use a 1000 watt or more iodine-tungsten lamp or a baking lamp to bake the spray surface and follow the spray to ensure a high base layer temperature.

Set the pressure and temperature of the spray spray according to the requirements of the construction manual of the Anjian Energy (all water-based soft foamed polyurethane). The spray pressure and temperature should be different from the wall spray set value.

The 600nm standard ribs, the standard ribs are the four sides of the square, and the thickness of the ribs is the thickness of the designed thermal insulation layer. In the part where the scaffolding board is difficult to lay, two orthogonal ribs are sprayed at the midpoint of the four sides of the ribs, and the 600x600nm ribs are divided into four equal 300x300nm ribs.

The spray gun should be as perpendicular as possible to the action surface and sprayed laterally. Spraying should be done once, and no secondary or refilling is allowed.

For parts where there is still a problem with individual foam bonding, the flash-priming technique can be used to enhance the adhesion of the foam to the base layer.

The super-spraying part of the foam is smoothed with a hand saw so that the surface of the foam is flush with the outer edge of the wooden keel.

Nieding spraying full water-based soft S foam SBS program III. Ground spraying construction scheme Ground spraying construction is relatively simple, workers can better control the spray angle and distance of the spray gun. Since the wooden keel has been pre-layed on the ground, attention should be paid to the follow-up of the scaffolding during the spraying process. In addition, the program should also focus on the issue of finished product protection.

Fixed ground wooden keel.

Clean up the floating surface and oil collapse on the working surface.

Cover the adjacent parts around the work surface with a plastic sheet.

Move the movable scaffolding along the horizontal direction. The scaffolding board should be placed on the sprayed foam with the spray.

Set the spray pressure and temperature according to the requirements of the Anjian Energy (All Water-Based Soft Foamed Polyurethane) Construction Manual.

The spray gun should be perpendicular to the active surface and sprayed laterally between the keels. Spraying should be done once, and no secondary or refilling is allowed.

For the painted surface of the sprayed surface, the super-spraying part of the foam is smoothed by hand saw so that the surface of the foam is flush with the outer edge of the wooden keel. It is covered with gypsum board or wood board and it is forbidden to carry heavy objects on the surface of the covered board.

Wenyuan Building's exterior wall, roof and floor are sprayed with advanced PUR materials such as water-based soft foamed polyurethane, replacement of double-layer insulated vacuum glass, heat-dissipating profile outer window and adjustable intelligent internal shading system, energy-saving renovation After the completion of the project, the comprehensive energy saving rate of the building reached more than 75%.

By spraying all-water-based soft foamed polyurethane on the roof, wall and floor of Wenyuan Building, a seamless continuous soft shell is formed inside the building's outer protective structure. This layer is soft and soft. The continuous shell is different from the insulation in the general sense. It has the following characteristics: the roof and floor of the building, the exterior wall and the floor insulation are integrated into one, and the structural thermal bridge is energy-saving. The impact is reduced to a minimum.

The all-water-based soft foaming polyurethane integrates heat insulation, gas barrier, moisture resistance and water immersion, without the need to additionally add a vapor barrier on the wall.

The all-water-based soft foaming polyurethane is free of substances harmful to human body such as benzene, toluene, xylene and formaldehyde, and is used indoors without any damage to human health.

The water-based soft foamed polyurethane is combined with the single-layer gypsum board, and the combustion performance reaches B1. The smoke density of the full water-based soft foamed polyurethane material is only 37.4. In the event of fire, the possibility of injury to personnel is small. .

The internal insulation of this project adopts the combination of all-water-based soft foamed polyurethane and wooden keel gypsum board system, which eliminates common problems such as hollowing and cracking of wall finish.

厶Liaoning Nianhua International Building Project Example Liaoning Nianhua International Building Project is located in the CBD center of Shenyang City, Liaoning Province. It is a comprehensive commercial building integrating labor-style commercial and residential apartments, commercial and labor offices and brand shopping malls. The total investment of the project is 200 million yuan, the total construction area is about 50,000 square meters, and the above-ground buildings have 29 floors and 2 underground floors. The opaque part of the façade is made of cherry red dry stone facing, and the transparent elevator wall is used for the elevator room. The overall architectural style and materials of choice highlight the high-end and practical positioning of the building. The project was completed and put into use in March 2006. It has won the “provincial demonstration project for the first energy-saving apartment building in the province and city”, “International Commercial Real Estate Gold Award” and “200 countries (Shenyang) typical energy-saving residential energy-saving public building demonstration pilot project "All honors."

The original design of this project is the external insulation of polystyrene board. The polystyrene board is a sheet material. When used in a stone hanging system, the polystyrene board is usually directly nailed to the wall leveling layer, and the stone is directly suspended outside. If the original design is adopted, on the one hand, because there is no protection of the thin plaster layer on the outer surface, the influence of the thermal bridge on the energy saving of the joint will be further amplified. On the other hand, it is impossible for the sheet material to dry the pendant and the anchor well. The package, the negative impact of these metal parts heat bridges on energy conservation will also be greater. The existence of a thermal bridge is bound to lead to the formation and accumulation of condensed water. The generation of condensed water will destroy the aesthetics of the stone finish and may even corrode the dry pendants and anchors, threatening the overall stability of the exterior finish system.

And the facade of the project is designed to be curved. As a semi-rigid sheet, polystyrene board cannot cover the outer wall of the building.

0 China residential facilities In this project, the calculated thermal conductivity of all-water-based soft foamed polyurethane is 0.04W/(mk). According to the public building energy-saving design standard GB 50189-2005, the average heat transfer coefficient of the outer wall of Shenyang area is limited. Requirements, according to the relevant provisions of the civil building thermal design code CB50176-93, to determine the full water-based soft foam polyamine wake insulation insulation coating thickness of SOrnn Oh painted parts of the project a total of 10,000 square meters of water spray construction The base soft foamed polyurethane insulation layer has passed the acceptance check, and its thermal insulation performance meets the design requirements. After two levels of evaluation in Liaoning Province and Shenyang City, it was confirmed that the water-based soft foamed polyurethane insulation layer fully meets the acceptance criteria, and meets the requirements of energy conservation, environmental protection and comfort required by the demonstration project.

The soft continuous shell formed by the all-water-based soft foamed polyurethane sprayed onto the base wall can block the anchor and the dry-hanging thermal bridge to the greatest extent, and no new joint thermal bridge is produced. Its advantages applied to the project are as follows: a. It will not collapse after being exposed to water, and there is no loss of thermal insulation performance after drying.

The thermal insulation layer formed by bi has "respirability".

It combines four functions of thermal insulation, gas barrier, moisture resistance and drowning.

Strictly stitched, shaped and corners can be well covered.

Jointless thermal bridges appear and can wrap the existing thermal bridge components to the maximum extent possible.

With elastic deformation ability, it can be elastically deformed with the thermal expansion and contraction deformation of the building's outer protective structure, so that there is no temperature stress crack.

The base level does not require special treatment and no further screed is required.

Moisture at the base level does not affect its adhesion.

100% water is used as a foaming agent, no fluoride and no harmful substitutes for the ozone layer. No harmful volatiles are released during the construction and after the formation.

Using the longevity, the thermal insulation performance is not reduced during the entire use period of the building. It can be constructed in winter, and the foam insulation performance will not be affected.

m uses special equipment for proportioning, heating, mixing and spraying. The construction is affected by human factors and the quality is guaranteed.

The quality control of the spraying construction is carried out by a combination of self-inspection, mutual inspection and acceptance. The quality control process is as shown in the following figure: The green water-based soft foamed polyurethane has the characteristics of green environmental protection, no seams, simple and quick construction, and effective inhibition of mold formation, making it one of the preferred materials for building insulation. . In fact, in countries where the energy-saving development of buildings such as the United States and Canada is relatively mature, the sandwich insulation and internal insulation of the envelope structure also mainly use all-water-based soft foamed polyurethane materials, and basically eliminate the Victorian insulation materials. . With the further development of energy-saving renovation of existing buildings in China, it is believed that the application of all-water-based soft foamed polyurethane will become more and more extensive. OS3

(Finish)

STAINLESS STEEL PRODUCTS

Stainless steel is a corrosion resistant steel alloy with a minimum of 10% chromium. There are different grades and surface finishes of stainless steel produced to accommodate the environment in which the material will be implemented. Unlike carbon steel, stainless steel does not rust when exposed to air and moisture due to the sufficient amount of chromium present. The chromium creates an invisible passive film of chromium oxide that will not let oxygen attack the surface and prevents rusting of the iron base.

Yuhong Group is a stainless steel manufactory of more than 20 grades of Stainless Steel.

Stainless Steel Coil Tube,304 Stainless Steel Coil Tube,Stainless Steel Cooling Coil Tube

YUHONG GROUP CO.,LIMITED , http://www.jessro-pipefittings.com