| abstract |
FIELD: chemistry. n SUBSTANCE: invention relates to a sheet construction element from a composite material, used in housing and industrial construction for long-span roofs and facades, as sandwich constructive elements in refrigerated warehouses, in sectional gates, in office constructions of a mobile type or in production of caravans. The sheet construction element contains two metal covering layers, a layer of rigid polyurethane and layer of dense polyurethane, which contains microcapsules with a core from a material with latent heat accumulation. An envelope of microcapsules is formed by polymerisation in situ from one or several monomers (monomers I), selected from the group, including alkyl esters of acrylic and/or metacrylic acids with a number of carbon atoms in alkyl from 1 to 24, acrylic acid, metacrylic acid and maleic acid. In addition polymers of the capsule envelope, preferably, contain embedded into polymer, at least, 10 wt %, but not more than 70 wt % of one or several bi- or polyfunctional monomers, which are non-soluble or badly soluble in water (monomers II), counted per the total weight of the monomers. In addition, the polymers can contain embedded into the polymer up to 40 wt % of other monomers III, different from the monomers I and II. n EFFECT: sheet construction elements in accordance with the invention possess an improved mechanical stability, in particular improved parameters of the span length, as well as provide improved climate. n 7 cl, 2 ex |