Polyurethane spray application scope and construction key points

Polyurethane spraying is a high-molecular polymer that is foamed on-site through high-pressure spraying under the action of various additives such as foaming agents, catalysts, and flame retardants, mixed through special equipment. At present, polyurethane foam plastics are mainly used in building exterior wall insulation, integrated roof waterproofing and insulation, cold storage insulation, pipe insulation materials, building panels, refrigerated trucks and cold storage insulation materials. Applications of polyurethane equipment: building roofs, tunnels, subways, roadbed waterproofing, production of foam film and television props, anti-corrosion of inner and outer walls of pipelines, cofferdam engineering, anti-corrosion of storage tanks and chemical storage tanks, pipeline coating layer, desalted water tank, pool waterproofing and anti-corrosion, chemical and mine wear-resistant, fender and buoyancy materials, basement waterproofing, carriage wear-resistant lining, exterior wall insulation, etc., especially for inter-city rail transit and high-speed rail bridge concrete surface waterproofing, which surpasses almost all Superior properties of existing materials.

About the use of polyurethane cold storage insulation, it is used more frequently as the modern food industry develops day by day. Jinan Jinghua Bangwei pointed out that in fact, as long as it is properly maintained, it will not only reduce a lot of unnecessary troubles for everyone, but also save a lot of costs. Where can polyurethane spraying be applied?

In modern cold storage doors, they are mainly composed of plastic parts and screws. of. The connection between profiles and plastic parts uses punching, pressing, drilling and other techniques to ensure that the door body has a solid structure and no solder joints. The latest cross connection design: the cross tube is punched using special technology, and the process is more solid and reliable. Operation is smoother and more orderly. Therefore, it is recommended that everyone pay attention to protecting the cold storage door when using it. This effectively retains heat and extends its service life.

1. Application fields of polyurethane spraying technology:

1. Exterior wall cold storage spray insulation;

2. Pipe insulation;

3. Cold storage board insulation;

4. Solar thermal insulation;

5. Refrigerator and freezer insulation;

6. Refrigerated container insulation;

2. Key points of polyurethane spraying construction:

1. Construction preparation

The base wall should comply with the “Construction Quality Acceptance Code for Concrete Structure Engineering”( GB50204-2002) and “Masonry Engineering Construction Quality Acceptance Code” (GB50203-2002) and the corresponding base wall quality acceptance code requirements and passed the acceptance. The performance indicators of polyurethane should comply with the requirements of JCT998-2006 “Spray Polyurethane Rigid Foam Insulation Materials”. The wall surface should be clean and free of oil stains and floating dust. Construction holes, scaffolding eyes, balcony boards, and wall defects should be repaired neatly with mortar; loose and weathered parts of the wall should be removed. The flatness error of the base wall shall not exceed 3mm.

2. Environmental requirements:

（1） Weather during construction operations The following conditions should be met: The ambient temperature during on-site spraying operations should be 15℃-40℃, but should not be lower than 10℃ or higher than 40℃; the moisture content of the wall should be 9%, the wind force is not greater than 5ms (level 3 wind) and the relative humidity should be less than 80%. No construction is allowed on rainy days. When the ambient temperature during construction is lower than 10°C, reliable technical measures should be taken to ensure the quality of spraying. It is strictly prohibited to operate under high humidity or exposure to the sun.

（2）External insulation construction and operation technical conditions are as follows:

Single row or double row of steel pipe scaffolding along the outer edge, steel pipe portal scaffolding; The distance from the decorative surface of the wall should be (00 -2.5 meters), the maximum point does not exceed 5 meters; there are guardrails not larger than 1.2 meters; its construction must comply with the current national safety technical regulations. The erection of scaffolding should meet the progress requirements of spraying.

（3）Polyurethane white and black materials should be stored sealed in a dry, ventilated and cool place. White materials should be stored The appropriate temperature is 15℃~20℃, not exceeding 30℃, and no exposure to the sun. The storage temperature of black materials is preferably 15℃~35℃, and shall not exceed 35℃. The minimum storage temperature shall not be lower than 5℃. The storage period of polyurethane white material and polyurethane black material is 6 months. Sun protection measures should be taken during storage and transportation of polyurethane white and black materials.

Three. Basic treatment before polyurethane construction

The wall should be cleaned, oil stains removed, and floating dust removed. Loose and weathered parts of the wall should be removed. The flatness of the wall should be controlled within±3mm. If the deviation of the base layer is too large, mortar should be applied for leveling. Remove all attachments, oil stains, bulging concrete beams and other defects on the exterior wall and correct the conformity and height of the protrusions.

nd:rgb(255,255,255)”>）Polyurethane white and black materials should be stored sealed in a dry, ventilated and cool place. The storage temperature of the white materials should be 15℃~20℃ is suitable, and shall not exceed 30℃, and shall not be exposed to the sun. The storage temperature of black materials is preferably 15℃~35℃, and shall not exceed 35℃. The minimum storage temperature shall not be lower than 5℃. Polyurethane The storage period of white materials and polyurethane black materials is 6 months. Sun protection measures should be taken during storage and transportation of polyurethane white materials and black materials.

3. Basic treatment before polyurethane construction

The wall should be cleaned and oil stains removed , remove floating dust, etc. Loose and weathered parts of the wall should be removed. The flatness of the wall should be controlled within±3mm. If the deviation of the base layer is too large, mortar should be applied for leveling. Remove all attachments, oil stains, bulging concrete beams and other defects on the exterior wall and correct the conformity and height of the protrusions.