Duroplastic-bonded molded fiber parts and method for producing the same
View Patent ↗The invention relates to thermoset-bound fiber moldings produced from fiber material based on natural and/or synthetic fibers and bound by means of a thermoset binder. To produce thermoset-bound fiber moldings which combine the good mechanical, acoustical and fire properties of phenolic-bound fiber moldings with an ideally complete absence of any odor due to phenolic resin, at least one adsorbent is embedded in the surface and/or in the interior of the fiber molding during the operation of pre- and/or end-curing the thermosetting binder.
1. Thermoset-bound fiber moldings comprising a fiber material based on natural fibers, or synthetic fibers or based on natural fibers and synthetic fibers, and bound by means of a thermoset binder, wherein at least one adsorbent is embedded in a surface or in an interior of the fiber molding during the operation of pre- or end-curing the thermosetting binder, wherein the adsorbent is present in a concentration of 1 to 30 parts by weight based on the thermosetting binder.
2. The thermoset-bound fiber moldings of claim 1 , wherein the adsorbent is present in a concentration of 15 to 20 parts by weight based on the thermosetting binder.
3. The thermoset-bound fiber moldings of claim 1 , wherein the adsorbent has a particle size which matches that of the binder.
4. The thermoset-bound fiber moldings of claim 1 , wherein the adsorbent is activated carbon.
5. The thermoset-bound fiber moldings of claim 1 , wherein the binder comprises a phenolic resin, an epoxy resin, and/or an epoxy-polyester resin mixture.
6. A process for producing the thermoset-bound fiber moldings of claims 1 comprising embedding the adsorbent in admixture with the thermosetting binder during the production of the thermoset fiber molding.
7. The process of claim 6 , wherein the process as an aerodynamic process.
8. The process of claim 6 , wherein the molding has a shaping effected by hot pressing.
9. The thermoset-bound fiber moldings of claim 1 , wherein the fiber material comprises glass fibers or an organic fiber like material, or combinations thereof.
10. The thermoset-bound fiber moldings of claim 1 , wherein the organic fiber like material is selected from the group consisting of wool, cotton, viscose rayon staple, jute, flax, hemp, polyester fibers, acrylic fibers, and combinations thereof.
11. The thermoset-bound fiber moldings of claim 1 , wherein the adsorbant material is selected from the group of silica gel, zeolites, aluminosilicates, and activated carbon.
12. The thermoset-bound fiber moldings of claim 1 , wherein the thermoset binder comprises a material selected from the group of diallyl phthalate resins, epoxy resins, urea resins, melamine resins, melamine-urea resins, melamine-phenol resins, phenolic resins, unsaturated polyester resins, and combinations thereof.
13. The thermoset-bound fiber moldings of claim 12 , wherein the thermoset binder further comprises a material selected from the group consisting of stearates, silica, lubricants, internal release agents, flame retardants, and combinations thereof.