What is the material of polyurethane sandwich panel, and what is the fire performance of polyurethan

The polyurethane sandwich panel is composed of the upper and lower layers of color steel plate and intermediate foamed polyurethane, which is compounded at one time after high-temperature foaming and curing, double track control molding, and there is a polyurethane edge banding rock wool board with rock wool board in the middle core material, polyurethane foam foamed on both sides, and then compounded with color steel plate.

Polyurethane edge banding rock wool board.

Polyurethane sandwich panels.

Polyurethane sandwich panels can be used for cold storage, and polyurethane sandwich panels are prefabricated by assembly line using two-component liquid polyurethane AB material.

The polyurethane material in the polyurethane sandwich panel is a polymer made of isocyanate and polyether as the main raw materials, and foamed under the action of various additives such as foaming agents, catalysts, flame retardants, etc. Polyurethane rigid foam is a new type of synthetic material with thermal insulation and waterproof functions, and its thermal conductivity is low, only half of that of extruded plastic board, which is the lowest thermal conductivity among all thermal insulation materials.

There are generally two processes for cold storage polyurethane insulation, one is the use of sandwich panel on-site splicing, and the other process is the use of polyurethane spraying machine on-site spraying foaming, compared with the first process, the second process is sprayed foaming without any seams on site, which greatly avoids the phenomenon of cold and hot bridges between joints, and the insulation effect is better than the first process.

Polyurethane sandwich panel, also known as PU board, polyurethane composite panel, it conforms to the national standard GB T 23932-2009,. Polyurethane sandwich panel is a composite material used as an insulation layer, with a single gold layer, a double gold layer and a non-metallic surface, which is widely used in logistics warehouses, factory buildings, roof protection systems and integrated house walls. The main purpose of this article is to introduce the high fire index of polyurethane sandwich panels.

Introduction to polyurethane sandwich panels.

Polyurethane sandwich panels are made of advanced sandwich panel continuous production lines, the interior and exterior are coated with aluminum and zinc and color steel plates, coated with polyurethane rigid foam in the middle, and finally formed by cooling and solidifying, the roofing panel with anti-leakage sandwich can give full play to the advantages of polyurethane sandwich panels, for example, polyurethane sandwich panels have excellent thermal insulation performance, because of its small thermal conductivity, strong thermal insulation and excellent fire performance. Not only that, its appearance is beautiful and the installation is also extremely convenient, non-toxic and tasteless, it is harmless to the human body, and it is one of the first choices for roofing and wall materials in factories, warehouses and other places where goods are piled up.

Fire rating and performance of polyurethane sandwich panels.

The fire rating of polyurethane sandwich panels has reached the national standard B1 level, and the fire performance is excellent, why is this? Here's why:

1) The thermal conductivity of polyurethane is relatively low, when the density of rigid polyurethane is 35-40kg per cubic meter, the thermal conductivity of polyurethane is only, which is the lowest thermal conductivity among the insulation materials that have been developed so far, only half of EPS. Not only that, polyurethane waterproof, moisture resistance is also very good, polyurethane is a hydrophobic material, its closed cell rate is more than 90%, therefore, polyurethane will not increase the thermal conductivity due to water absorption, and the wall will not seep water;

2) Polyurethane is a self-extinguishing material that is difficult to burn after the addition of flame retardants. Polyurethane only decomposes at high temperatures, and its softening point is above 250 degrees Celsius;

3) Polyurethane will produce carbon when burning, which will accumulate on the surface of its foam, which helps to isolate oxygen and the underlying foam to prevent the spread of fire.

4) Because polyurethane has excellent fire performance, it can reduce the thickness of the wall, thus increasing the usable area of the room;

5) The porosity and structure of polyurethane are relatively stable, not easy to crack, strong safety, and the service life is higher than that of other insulation materials, and the comprehensive cost performance is relatively high.

The outer material of the polyurethane sandwich panel is made of Baotie or polymer plastic, and the polyurethane of the sandwich panel is flammable, so the fire performance of the outer layer of thin iron and polymer plastic is also very low.

Introduction: There are many types of sandwich panels on the market, and the performance, specifications, and quality are also different, which is easy to make us confused and unable to start. In particular, we don't know what to do when we don't know the properties and specifications of materials, so it is especially important to have some knowledge related to panels, especially if you are the creator of buildings.

The following rabbit will take you to learn about polyurethane sandwich panels.

1. About polyurethane and polyurethane sandwich panels.

Polyurethane is an organic compound polymerized by a variety of compounds into Douxiaoliang, the full name is polyurethane, and the polyurethane material made of it is a newly developed organic polymer material, which is an emerging high-tech environmental protection material, and is a new type of plastic. Polyurethane material has outstanding performance compared with other materials of the same type, so it is widely used in many fields of production and life, among which polyurethane sandwich panel is one of the forms of utilization. Polyurethane sandwich panel, as the name suggests, is a sandwich is a plate composed of polyurethane materials, specifically made of polyurethane materials and other plates, and in layman's terms, polyurethane materials are sandwiched between two steel plates or other materials.

At present, the most used building materials are double-sided metal polyurethane sandwich panels made of metal plates and rigid polyurethane materials, which is a kind of plate that we recommend when building houses.

Second, the outstanding performance and application fields of polyurethane sandwich panels.

Compared with other types of sandwich panels, the performance advantages of polyurethane sandwich panels are mainly reflected in several aspects, such as anti-corrosion and durability, compression resistance, bending resistance, non-deformation, heat insulation, and fire prevention. Due to the outstanding performance advantages of polyurethane sandwich panels, they are used in a wide range of applications, such as in the construction sector. At present, polyurethane sandwich panels are mainly used in construction for thermal insulation of the roof of buildings or exterior walls, and will also be used in the construction of prefabricated houses, and some warehouses or freezers will also use it.

3. Specifications of polyurethane sandwich panels.

Polyurethane sandwich panels are used for different purposes and manufacturers, so there are many specifications. At present, there are two types of polyurethane sandwich panels used more on the market, namely 1150 and 950 polyurethane sandwich panels, and there are many specifications of polyurethane sandwich panels for two types. The thickness of polyurethane sandwich panels is generally mm, width and length can be customized to the manufacturer according to their own needs.

The thicker the thickness of the polyurethane sandwich panel, the higher its **, because the thickness determines the amount of polyurethane material.

There are many manufacturers of polyurethane sandwich panels, and the quality of the products is also uneven.

You can get it for free

The ** of 50-thick rock wool color steel plate is closely related to the pile weight of the rock wool core material and the thickness and quality of the panel! However, the general quality of the 50 thick color steel plate is about 40 yuan, the medium quality of the 50 thick color steel rock wool sandwich panel is about 55 yuan, and the 50 thick color steel rock wool sandwich panel is about 65 yuan.

Abstract: The outer layer of polyurethane color steel sandwich panel is made of high-grade metal materials such as color steel plate, aluminum plate, copper plate, etc., the inner layer is made of high weatherproof aluminum-zinc color steel plate, and the insulation core material is made of PUR rigid polyurethane insulation foam.

The outer layer of the polyurethane color steel sandwich panel is made of high-grade metal materials such as color steel plate, aluminum plate, copper plate, etc., the inner layer is made of high weather-resistant aluminum-zinc color steel plate, and the insulation core material is made of PUR rigid polyurethane insulation foam. Using the principle of drum, the foaming molding is developed by the continuous production line at one time. Polyurethane color steel sandwich panel integrates heat preservation, heat insulation, load-bearing and fire prevention, and is a new high-grade building material with rich colors and beautiful shape.

Polyurethane color steel sandwich panel has the characteristics of fire retardant, wide range of operating temperature, low thermal conductivity, non-toxic and tasteless, waterproof and moisture-proof, and simple construction. Therefore, it is widely used in the roofs and walls of high-end buildings such as large industrial plants, power plants, hangars, exhibition halls, gymnasiums, cold and cold, purification workshops, warehouses, etc.

Six core advantages of polyurethane color steel sandwich panel:

1. Energy-saving and thermal insulation: the closed cell rate of the core material is 97%, and the thermal insulation performance is superior.

2. Flame retardant and fire prevention: The product has passed the inspection of the National Quality Supervision and Inspection Center for Fixed Fire Extinguishing System and Refractory Components, and the combustion grade can reach the corresponding standard of GB8624-2006.

3. Airtight sound insulation: good sound absorption, and has a reducing effect on the sound caused by rain, hail and other impacts.

4. Green and environmental protection: no formaldehyde, no microbial invasion, recyclable.

5. Beautiful and economical: the surface form is diverse, the color is rich, the material loss is reduced, and the construction time and engineering cost are saved.

6. Fast construction: Polyurethane sheet is produced in a highly controlled and constant temperature environment in the factory, with stable quality, fast construction and application for more than 35 years.

The performance of the three is different, the fire performance of rock wool is the best, reaching class A, the polyurethane insulation effect is the best, in terms of air tightness and water tightness, polyurethane and rock wool are about the same, EPS belongs to the relatively weak performance of the three, rock wool sandwich panel and polyurethane sandwich panel are more, the two mainly depend on the application requirements.

Three materials, rock wool is fireproof, EPS is waterproof, polyurethane is fireproof, polyurethane should be more expensive.

1. Different fire ratings: rock wool sandwich panel is grade A, EPS is grade B3, and polyurethane is grade B1.

2. Different thermal insulation performance: polyurethane sandwich panel is the best among the three.

3. Different waterproof performance: polyurethane and EPS are better than rock wool among the three.

4. The density is different: the bulk density of rock wool is generally 120kg cubic meters, EPS is generally 16, and polyurethane is generally 40

All in all, the comprehensive performance of polyurethane sandwich panel is the best, and it is the best choice for the envelope of steel structure buildings.

The common point is that they are all sandwich panels, all with a hard protective layer, and the difference is that the material in the middle is different.

The production of polyurethane sandwich panels requires an advanced continuous production line for sandwich panels, and the process is cold-formed by cold forming of internal and external galvanized (aluminum-zinc) color steel plates, and the middle is coated with polyurethane rigid foam.

Foam sandwich panel beautiful appearance, bright color, good overall effect, it set load-bearing, insulation, waterproof in one, and no need for secondary decoration, is a wide range of uses, especially for the construction site of temporary facilities such as offices, warehouses, fences, etc., but also reflects the civilized construction of modern construction sites, especially in the rapid installation and use, in the installation and detachable, material turnover reuse index, have obvious advantages, significantly reduce the cost of temporary facilities at the construction site, It will be an indispensable new lightweight building material.

There are foams including EPS polystyrene and so on.

Polyurethane is one of the better effects at present.

On the market, there are three flame retardant grades of polyurethane foam: B1, B2 and B3.

Because of the cost problem, most of the polyurethane materials used in sandwich panels are B3 grade, a small amount of B2 grade, and a small amount of B1 grade with special requirements.

Class B1 is 'flame retardant';Class B2 is 'flammable';Class B3 is 'flammable'.

B1 oxygen index is required to be more than 30%; B2 level requires more than 26%, and less than 26% is collectively referred to as B3 level.

The flame retardant you are talking about should be self-extinguishing after leaving the fire. B2 and B1 are definitely no problem to get out of the fire. A better B3 grade (oxygen index of about 25%) can also self-extinguish from the fire, but it takes a few seconds longer than the B2 grade to self-extinguish.

Generally, if the oxygen index is below 24%, it is difficult to self-extinguish after leaving the fire, and it will continue to burn, and the more it burns, the bigger it will be. . .

Oxygen index: the concentration of oxygen required for stable combustion in a mixture of oxygen and nitrogen under the conditions of a specified shape of bar foam, a specified ignition source and a flame size. For example, the better the flame retardant performance of the foam, the higher the concentration of oxygen required to ignite the foam, and the higher the oxygen index of the foam.

It depends on whether flame retardants are added.