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Views: 10 Author: Site Editor Publish Time: 2021-06-29 Origin: Site
1. What is polyurethane spraying?
Polyurethane spraying technology is based on isocyanate and polyether as the main raw materials. Under the action of various additives such as blowing agent, catalyst, flame retardant, etc., through the use of special network equipment and mixing, the high-pressure spraying construction site is foamed. Into a high molecular weight polymer. Rigid polyurethane foam is a new type of biosynthetic research material developed with good thermal insulation and waterproof system functions. Its thermal conductivity coefficient is low, only 0.022～0.024W/(m².k). It is equivalent to half of the extruded board, which is the lowest thermal conductivity coefficient of all building insulation engineering materials in my country. Polyurethane spray flame retardant grades B1 and B2 can be used.
Rigid polyurethane foam is generally foamed at room temperature, and its molding process is relatively simple. In our refrigeration industry, rigid polyurethane foam is generally used for spraying.
Black material and white material: The scientific name of black material is polyisocyanate. Because it is a black viscous liquid, it is commonly called black material. Among them, MD is a kind of polyisocyanate, which is used in the production of refrigerator polyurethane foam.
The white substance is a white viscous liquid. In the industrial production of refrigerator polyurethane foam, it is usually mixed with polyether polyol and catalyst foam stabilizer.
The application of polyurethane spraying and the characteristics of product development
Polyurethane spraying is widely used in various industries, mainly in our refrigeration and HVAC industries:
Spray insulation for external cold storage;
Cold storage board insulation;
Solar insulation; refrigerator and freezer insulation; refrigerator container insulation;
Cold storage insulation we usually use polyurethane sandwich double-sided color steel cold storage insulation board, or directly spray the polyurethane facade on the wall for insulation. In southeastern my country, polyurethane sandwich double-sided color steel insulation panels account for the vast majority, while in the northwest, polyurethane vertical spraying accounts for the vast majority.
Solar hot water pipe casing insulation is a sandwich structure composite insulation pipe, which is composed of an inner PPR hot water pipe, an outer PVC pipe and a central polyurethane foam insulation layer. Polyurethane insulation pipe is a kind of insulation pipe that transports hot water from the
Polyurethane elastomers are typical multi-block copolymers, where the molecular chain consists of flexible chain segments with a glass transition temperature below room temperature and rigid chain segments with a glass transition temperature above room temperature. The oligomer polyol constitutes th
Cold storage spray polyurethane focuses on the overall seamless condition after spray foaming. Polyurethane has good density, insulation and cold resistance. It is basically a closed cell structure. It not only has excellent thermal insulation properties, but also has good resistance to freezing and
In order to select the shrinkage rate of large cast polyurethane elastomer products more accurately, the influences of process conditions, environmental factors and product structure on the shrinkage rate were systematically investigated, and the change curves of shrinkage rate with time were measur
On June 8, the CNMC-A25 polyurea spraying machine produced by Hightop Group was loaded in Hightop Group Industrial Park and will be exported to Italy. CNMC-A25 polyurea spraying machine is widely used in industrial maintenance, tunnel, subway, roadbed waterproofing, foam film and television props pr
On May 27th, the CNMC-E3 polyurethane spraying machine produced by Hightop Group was loaded in Wente Industrial Park and will be exported to the Italy. CNMC-E3 polyurethane spraying machine is widely used in industrial maintenance, tunnel, subway, roadbed waterproofing, foam film and television pro
On August 2, CNMC-E3 polyurethane spraying machine was loaded in the industrial park and will be exported to France soon.CNMC-E3 polyurethane spraying machine is widely used in industrial maintenance, tunnel, subway, waterproofing of road base, production of foam film and television props, pipeline
For the polyurea spraying equipment should take how to recommend1, polyurea is a set of waterproof, anticorrosion, wear-resistant, protection of multiple performance materials, but there is a certain range of tolerance, polyurea's recommended temperature range for the use of -40 ℃ -120 ℃.2、 Polyurea
Polyurea waterproof and anti-corrosion construction is generally spraying operation, in front of the small series to tell you why the reason for spraying, I believe everyone should have understood, now is about the construction process of the problem, let's take a look at it.Summary of polyurea wate
One. Corrosion resistanceIn addition to hydrogen acid, concentrated nitric acid and some strong oxidants, polyurea coatings show good stability in acid, alkali, salt, seawater, oil and other media, in the salt spray medium to do a strengthening comparative experiment, 1000 hours later, polyurea and