摘要:
The invention relates to foam comprising hollow microbeads and intended for sound absorption, comprising from 40 to 85% by weight of open-cell polymer foam and from 15 to 60% by weight of hollow microbeads with flexible external layer, where the D50 value of the hollow microbeads is at least 70 μm and at most 250 μm, based on the total weight of polymer foam and hollow microbeads, and also to a process for producing the same, comprising the following steps: I) impregnation of an open-cell polymer foam with a liquid dispersion comprising expandable hollow microbeads, II) if appropriate, pressing/compression and/or drying of the polymer foam, and Ill) heat-treatment of the impregnated polymer foam at a temperature above the expansion temperature and below the decomposition temperature of the expandable hollow microbeads, for the expansion of the hollow microbeads.
摘要:
The invention relates to foam comprising hollow microbeads and intended for sound absorption, comprising from 40 to 85% by weight of open-cell polymer foam and from 15 to 60% by weight of hollow microbeads with flexible external layer, where the D50 value of the hollow microbeads is at least 70 μm and at most 250 μm, based on the total weight of polymer foam and hollow microbeads, and also to a process for producing the same, comprising the following steps: I) impregnation of an open-cell polymer foam with a liquid dispersion comprising expandable hollow microbeads, II) if appropriate, pressing/compression and/or drying of the polymer foam, and III) heat-treatment of the impregnated polymer foam at a temperature above the expansion temperature and below the decomposition temperature of the expandable hollow microbeads, for the expansion of the hollow microbeads.
摘要:
Melamine-formaldehyde foams comprise from 80% to 98% by weight of an inorganic filling material, wherein the % by weight are based on the total weight of inorganic filling material plus melamine-formaldehyde precondensate used for foam production.
摘要:
Melamine/formaldehyde foams comprising from 0.01% to 45% by weight of a particulate filling material having an average particle diameter in the range from 5 μm to 3 mm, wherein the % by weight are based on the total weight of filling material plus melamine-formaldehyde precondensate used for foam production.
摘要:
Melamine-formaldehyde foams comprise from 80% to 98% by weight of an inorganic filling material, wherein the % by weight are based on the total weight of inorganic filling material plus melamine-formaldehyde precondensate used for foam production.
摘要:
Novel melamine-formaldehyde foams comprising microcapsules built into the structure of the condensation products and also processes for the production thereof and uses thereof.
摘要:
A plant substrate consisting of (a) 25 to 100% by weight of an open-celled melamine/formaldehyde foam, (b) 0 to 75% by weight of other synthetic plant substrates and/or mineral soil and (c) 0 to 25% by weight of one or more systems for releasing active substances and/or of other additives, can be stored and transported in the absence of any water and makes possible a good aeration in the soil.
摘要:
The invention relates to a tube which has been filled with an open-cell foam based on an aminoplastic, in particular on a melamine-formaldehyde condensate, and also to its uses, in particular as filter or static mixer.
摘要:
A liquid-impregnated shaped foam article consisting ofa) from 1 to 10% by volume of an open-cell foam based on an aminoplast andb) from 90 to 99% by volume of a component which is liquid at 25° C., such as aromatic or aliphatic hydrocarbons, alcohols, ketones, water or aqueous dispersions, and the uses thereof for transporting or metering liquids, for cleavage through freezing, for energy absorption of projectiles or as latent heat stores.
摘要:
The invention provides a molding producible by a process comprising the following steps: a) introduction of a foamable reactive resin into a support material and b) compressive deformation of the support material comprising the foamable reactive resin.