Abstract:
Melamine/formaldehyde foams which contain 0.01 to 45% by weight of a particulate filler having a median particle diameter in the range from 5 µm to 3 mm, wherein the % by weight is based on the total weight of the melamine/formaldehyde precondensate and filler used for the foam production.
Abstract:
The invention relates to foams and molded parts made of foamed supporting materials that are selected from the group consisting of polyurethane resins, polyester resins, epoxides, as well as non-woven fabrics, woven materials, and open-cell two- and three-dimensional networks that consist of mineral, animal, plant, and chemical (natural/synthetic) fibers or mixtures thereof containing melamine/formaldehyde resin as a foaming reactive resins.
Abstract:
The invention relates to processes for producing melamine-formaldehyde foams comprising the consecutive steps a) and b): a) heating a mixture comprising a melamine-formaldehyde precondensate, a curative and a blowing agent to foam up and crosslink said mixture, and b) tempering the foam obtained in step a), wherein it is essential to the present invention that - step a) utilizes a precondensate which has a melamine:formaldehyde molar ratio in the range from 1:2.1 to 1:3.9, and - which has a sulfite group content, based on the total weight of the melamine-formaldehyde precondensate, in the range from 0% to 1% by weight, and - said tempering in step b) is effected at a temperature in the range from 230 to 290°C, and also to melamine-formaldehyde foams obtainable according to the processes of the invention, and to uses thereof.
Abstract:
The invention relates to a method for the production of an abrasive foam on the basis of a melamine-formaldehyde-condensation product comprising inorganic nanoparticles, with the following steps: (1) Producing a solution or dispersion comprising a precondensate of the foam to be produced and inorganic nanoparticles, (2) foaming the precondensate by heating the solution or dispersion from step (1), in order to obtain a foam comprising inorganic nanoparticles, and if applicable (3) tempering the foam obtained in step (2), which leads to an increased abrasion when polishing delicate surfaces.
Abstract:
The present invention relates to a method for the production of a foam comprising at least one antimicrobial active agent, comprising the following steps: (1) producing a solution or dispersion comprising at least one pre-condensate 10 of the foam to be produced, and at least one antimicrobial active agent, (2) foaming the pre-condensate by heating the solution or dispersion from step (1) in order to obtain a foam having at least one antimicrobial active agent, and (3) tempering the foam obtained in step (2) at a temperature of 120 to 300°C. The invention further relates a foam produced in this manner, a molded part comprising such a foam, and the use of such a foam for the heat and sound insulation of buildings and building parts, for the heat and sound insulation of the interior spaces of vehicles and aircraft, for low temperature insulation, as an insulating wall covering, as an insulating and impact damping packaging material, as abrasively acting cleaning, grinding, and polishing sponges, in the hygiene sector, and as filter material.