{"id":132183,"date":"2021-08-27T10:22:54","date_gmt":"2021-08-27T08:22:54","guid":{"rendered":"https:\/\/concentrol.com\/the-sector-of-polyurethane-panels-and-blocks\/"},"modified":"2021-08-27T11:01:47","modified_gmt":"2021-08-27T09:01:47","slug":"the-sector-of-polyurethane-panels-and-blocks","status":"publish","type":"post","link":"https:\/\/hosting175685eu-cp704.wordpresstemporal.com\/de\/the-sector-of-polyurethane-panels-and-blocks\/","title":{"rendered":"The sector of polyurethane panels and blocks"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]<\/b><\/p>\n

At present we can find multiple applications of polyurethane in many areas, due to its great versatility and its insulating efficiency. At Concentrol we currently offer an extensive range of chemical specialties that includes release agents and silicone surfactants specially designed for the manufacture of polyurethane foam insulating panels.<\/span><\/p>\n

In the sector of polyurethane panels and blocks, we can differentiate two main types of applications that are used in the technical insulation and construction industries: insulating sandwich panels (continuous or discontinuous) and box mold blocks made from rigid polyurethane foam. Their increasingly widespread use is due to the fact that they not only provide thermal and acoustic insulation, but also work as a waterproofing and enclosing agent, with solutions that are light as well as resistant.<\/span><\/p>\n

Polyurethane<\/strong><\/p>\n

A polyurethane system is made up of two types of liquid components that, through the chemical reaction that is generated between them, give rise to polyurethane foam:<\/span><\/p>\n

    \n
  1. a) Firstly, polyols to which other chemical additives are added (such as catalysts, silicones, blowing agents, etc.)<\/span><\/li>\n
  2. b) Secondly, isocyanates, such as TDI, MDI, MMDI, PMDI, or pre-polymers.<\/span><\/li>\n<\/ol>\n

    Currently, the sector that generates the highest consumption and demand for polyurethane panels and blocks is industrial and residential construction and building. The main application in this market is formulated and semi-formulated polyurethane systems that allow closed or open cell rigid foams to be obtained.<\/span><\/p>\n

    One of the most interesting solutions in this sector is sandwich panels formed by an insulating core of rigid polyurethane (PUR) or poly-isocyanurate (PIR) foam adhered to two steel or aluminium metal profiles.<\/span><\/p>\n

    The PIR (polyisocyanurate foam) variety looks almost like polyurethane (PUR) foam, but has different thermal and mechanical properties. The main difference is the reaction of PIR foam to fire, forming a carbonated surface layer that protects and prevents the fire from penetrating the internal layers of the panel. This greater resistance to fire allows these solutions to obtain the BS2D0 or BS1D0 certification. The UNE-EN 13501 standard is detailed below, with the different possibilities in the results:\u00a0<\/span><\/p>\n

    \"\"<\/p>\n

    Source:<\/span> https:\/\/www.une.org\/<\/span><\/a><\/p>\n

    This table summarizes some main technical differences between a PUR and PIR panel:\u00a0<\/span><\/p>\n\n\n\n\n\n\n\n\n
    <\/td>\nPUR<\/b><\/td>\nPIR<\/b><\/td>\n<\/tr>\n
    Components line<\/b><\/td>\n4-5<\/span><\/td>\n5<\/span><\/td>\n<\/tr>\n
    Density<\/b><\/td>\n35-40 kg\/m3<\/span><\/td>\n41-43 kg\/m3<\/span><\/td>\n<\/tr>\n
    Press temperature<\/b><\/td>\n35-42\u00baC<\/span><\/td>\n50-60\u00baC<\/span><\/td>\n<\/tr>\n
    Sheet temperature<\/b><\/td>\n30-35\u00baC<\/span><\/td>\n40-45\u00baC<\/span><\/td>\n<\/tr>\n
    Adherence promoter<\/b><\/td>\nNO<\/span><\/td>\nS\u00cd<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    Applications of polyurethane systems<\/b><\/p>\n

    PUR and PIR sandwich panels with continuous technology are used both with metallic and flexible coatings, in enclosures (for facades and roofs), in cold rooms and in general as insulation in construction. PUR and PIR sandwich panels with discontinuous technology are used for their thermal properties in the cold industry. Finally, rigid foam blocks are also a polyurethane application that is used in different sectors.<\/span><\/p>\n

    Requirements of polyurethane foams<\/b><\/p>\n

    The main requirements of rigid polyurethane foam are:<\/span><\/p>\n

    – Thermal insulation properties (closed cell structure and low conductivity)<\/span><\/p>\n

    – Good adhesion to different substrates<\/span><\/p>\n

    – Dimensional stability<\/span><\/p>\n

    – Flame retardant properties<\/span><\/p>\n

    – No surface defects<\/span><\/p>\n

    – Good fluidity (refrigerated and discontinuous)<\/span><\/p>\n

    Coefficient of thermal conductivity (\u03bb)<\/b><\/p>\n

    The thermal conductivity of a material is the property that it has to transmit heat, allowing the passage of kinetic energy from its molecules to adjacent substances. Thermal conductivity is calculated from a coefficient (\u03bb ‚lambda‘) and will differ depending on the molecular nature of each material, measuring how well a material conducts heat in units of watts over meters Kelvin (W \/ m\u00b7K).<\/span><\/p>\n

    The calculation is carried out with the following formula, where q is the heat flux per unit of time and area, and grad. T is the temperature gradient:<\/span><\/p>\n

    \u03bb = q\/grad. T<\/span><\/p>\n

    For insulation, the lower the lambda value, the better the thermal performance. Polyurethane sandwich panels are one of the materials on the market that currently has the lowest coefficient of thermal conductivity, which is why its use as a constructive element for thermal insulation has spread. The \u03bb value is usually less than 0.025 (W \/ m \u00b7 K), always measured at a temperature of 10\u00baC. For this reason, the required thickness is also usually lower compared to other types of insulating materials.<\/span><\/p>\n

    Source: <\/span>https:\/\/www.camarasfrigorificas.es\/blog\/comportamiento-del-panel-sandwich\/<\/span><\/a><\/p>\n

    Source: <\/span>https:\/\/concepto.de\/conductividad-termica\/#ixzz6zNJr4ZVM<\/span><\/a><\/p>\n

     <\/p>\n

    Concentrol’s range<\/b><\/p>\n

    Silicone stabilizers<\/strong><\/p>\n

    In choosing the optimal stabilizer (or surfactant) for each polyurethane system, both chemical requirements and those related to the manufacturing process must be considered.<\/span><\/p>\n

    The chemical requirements are related to the type of polyol, isocyanate and blowing agent used. The influence of other components such as catalysts must also be considered. The most important points to consider regarding the process include effective mixing, curing conditions, and the flow demands of the casting. Our stabilizers are developed for each specific application, considering the foaming agent, which plays a critical role in each formulation.<\/span><\/p>\n

     <\/p>\n

    Advantages of Concentrol’s range of stabilizers -STB PU-22XX-<\/b><\/p>\n

    Concentrol surfactants meet the main needs and requirements of rigid polyurethane producers:<\/span><\/p>\n