Application of Polyurethane Thermal Insulation Material on Exterior Wall

 

I. Overview of Polyurethane Hard Foam Coating Technology

 

In construction projects, the construction of polyurethane hard foam exterior wall is the most common method of exterior wall construction. It is an advanced construction method with broad application prospects. This kind of construction technology has the advantages of good overall performance, aging resistance, high stability, easy construction, and good durability due to its own selection.

 

1, concept

 

Polyurethane hard foam spraying material is a new type of external wall thermal insulation construction material. It has been highly valued by people from all walks of life in the current construction project, and has also become the focus of research in the entire engineering field. This type of material has a non-absorbent, impervious, and good insulation effect during use, and is a highly valued modern waterproofing system in the entire construction market.

 

2, performance

 

Polyurethane rigid foam system is one of the most important items in current engineering projects. It is a new type of material that was introduced into the construction market in the last two years. The current application mainly includes spraying, casting, and dry hanging. Among them, one of the common methods used in the current construction process is the spray coating method. This is mainly due to the fact that the polyurethane foam spray itself has oligomeric polyols, isocyanates, and other substances, so that it has good adhesive properties.

 

Second, polyurethane spray technology in construction projects

 

Polyurethane hard foam spraying technology has become an important construction method in the current construction project. Its main application advantages in construction include the following aspects.

 

1, technical advantages

 

(1) The application of polyurethane rigid foam spraying technology has its own advantages of good insulation effect and high energy-saving advantages. This is mainly due to the fact that this material itself is an excellent construction material with excellent thermal conductivity and is Construction can be carried out continuously during construction, which is of great significance for ensuring the integrity of materials and walls.

 

(2) Polyurethane insulation and double particle insulation effect of polystyrene powder particles. Through the interface agent, the two are combined to exert their respective effects. Polypropylene particles fireproof breathable layer excellent protection properties. The anti-cracking technology line that meets the flexible gradient layer-by-layer release stress can effectively prevent the occurrence of cracks in the protective surface layer, improve the stability and durability of the system, and reduce the thickness of the polyurethane insulation layer, which can save the project cost and reduce the cost; effectively block the Effect of fire source on rigid foam polyurethane insulation layer.

 

(3) No cavity structure, strong wind pressure resistance. The rigid foam polyurethane foam coating is firmly bonded to the base wall to form an organic whole with the base wall, with no seams and no cavity, reducing the damage of the air pressure, especially the negative wind pressure, on the external insulation system of the high-rise building exterior wall. .

 

2, construction points

 

2.1 Construction Preparation

 

"Polyurethane rigid foam spray insulation system" material entered the construction site, under the supervision of the supervision engineer into the site acceptance, and according to the provisions of the sample re-examination, all materials, quality, performance meet the requirements and related standards (with the CMA mark Material test report and appearance certificate). Various raw materials are classified and stored, protected from rain, sun exposure and fire, and should not be stored in the open air. All kinds of work tools and tools are available, and they are inspected, safe and reliable; all kinds of measurement tools are checked correctly.

 

2.2 Grassroots Wall Cleaning

 

2.1 Acceptance of grass-roots walls, the surface of the grass-roots level should be smooth, clean, smooth and smooth, straight line angle clear, uniform hair lines, all door windows, holes, slots, boxes and positions of the wall is correct, the surface neat and clean, pipeline Plastered the back. The pre-embedded parts protruding from the wall are pre-installed; equipment or pipe clamps installed on the outer wall shall be fixed on the base wall, and shall be sealed and waterproofed.

 

2.2 According to the design requirements, pop-up windows, horizontal and vertical control lines, expansion joints and decorative lines on the wall. At the exterior corner of the building and other necessary angles, vertical baselines and horizontal lines are hung.

 

3. Spray polyurethane rigid foam insulation construction

 

3.1 Fixation of insulation

 

During the construction, the fixed insulation board method used in the construction of different message systems is not the same. In some insulation boards, the zebra pattern is bonded or anchored to the base substrate during construction, and some are The combined use of the measures used in the construction, the rigorous analysis and processing of anchorage measures, and the application of materials in different systems are not the same and improve.

 

3.2 The distance between the spray gun head and the work surface should be adjusted according to the pressure of the spraying equipment, and should not exceed 0.5 to 10 m; the speed of the spray gun head should be uniform when spraying. Insulation layer and wall and each structural layer must be firmly bonded, no voids and cracks, surface layer without powder, peeling, ash.