Abstract:
The invention relates to foam particles based on thermoplastic elastomers and having a coating containing at least one electrically conductive substance, to a method for producing said particles by coating the foam particles with an emulsion of a conductive substance in a plasticiser. The invention also relates to a method for producing particle foams by the thermal bonding of the foam particles by means of high-frequency electromagnetic radiation.
Abstract:
The invention relates to coated molded bodies comprising at least one molded body made of foamed particles of at least one polyurethane (A) and comprising at least one coating made of at least one polyurethane (B). Polyurethane (A) and polyurethane (B) is each made of at least one polyol and at least one polyisocyanate; at least 50 wt.% of the polyol component used to produce polyurethane (A) and polyurethane (B) is identical; and at least 50 wt.% of the at least one polyisocyanate component used to produce polyurethane (A) and polyurethane (B) is identical. The invention further relates to a method for producing the coated molded bodies according to the invention and to the use of the coated molded bodies according to the invention for different applications.
Abstract:
The invention relates to a method for producing a hard foam, comprising the following steps: at least one polyisocyanate is reacted with a mixture containing at least one polyepoxide, water and at least one additional hydrogen azide compound, said reaction taking place in the presence of a metal-free Lewis base with at least one nitrogen atom, hard foams obtained according to said type of method, and to the use of the claimed hard foam for producing insulating materials, vacuum insulation panels, cooling devices, components, wind rotor blades or elements boat and vehicle construction.
Abstract:
The invention relates to a method for producing expanded granulate from a thermoplastic elastomer having a breaking elongation of more than 100% measured according to DIN EN ISO 527-2, comprising the steps: (a) pressing a polymer melt comprising a propellant through a perforated plate (18) which is temperature-controlled to a temperature between 150°C and 280 °C into a granulating chamber (26), (b) reducing the polymer melt pressed through the perforated plate (18) by means of a cutting device (20) into individual, expanding granulate grains, (c) removal of the granulate grains from the granulating chamber (26) by means of a fluid flow (36), wherein the propellant contains CO2 or N2 or a combination of CO2 and N2 and the volume of propellant in the polymer melt comprising propellant lies in the range from 0.5 to 2.0 wt% and wherein a liquid which is temperature-controlled to a temperature between 5°C 20 and 90°C, having a pressure of 0.1 bar to 20 bar above the environmental pressure, flows through the granulating chamber (26), wherein the pressure and temperature of the liquid in the granulating chamber (26) and the temperature of the perforated plate (18) are selected such that the granulate grains in the pressurized liquid are expanded by the contained propellant such that expanded granulate grains having a closed skin result.