Abstract:
The invention relates to a process for producing storage-stable polyurethane prepregs and mouldings produced therefrom (composite components). For production of the prepregs or components, for example, (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers are mixed with non-(meth)acrylic polyols and with uretdione materials. This mixture or solution is applied to fibre material, for example carbon fibres, glass fibres or polymer fibres, by known methods and polymerized thermally, via a redox initiation or with the aid of radiation or plasma applications.Polymerization, for example at room temperature or at up to 80° C., gives rise to thermoplastics or thermoplastic prepregs which can subsequently be subjected to a forming operation. The hydroxy-functionalized (meth)acrylate constituents and the polyols can subsequently be crosslinked with the uretdiones already present in the system by means of elevated temperature. In this way, dimensionally stable thermosets or crosslinked composite components can be produced.
Abstract:
A thermally curable and radiation-curable formulation, contains A) 45% to 99.9% by weight of at least one radiation-curable component; and B) 0.1% to 5% by weight of at least one selected free-radically initiating photo-initiator; and optionally C) 0.01% to 50% by weight of at least one additive; wherein the sum total of A) and B) and any C) is 100% by weight. The formulation is curable with actinic radiation and/or thermally and is used, for example, for the production of pigmented and pigment-free coating materials, and for adhesives and sealants.
Abstract:
The invention relates to a process for producing storage-stable polyurethane prepregs and to mouldings (composite components) produced therefrom. The prepregs and, respectively, components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalised (meth)acrylate monomers and/or hydroxy-functionalised (meth)acrylate polymers with uretdione materials. Photoinitiators can also optionally be added. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerised with the aid of radiation or of plasma methods. Polymerisation, e.g. at room temperature or at up to 80° C., gives thermoplastics or thermoplastic prepregs, and these can subsequently also be subjected to forming processes. The hydroxy-functionalised (meth)acrylate constituents can then be crosslinked with the uretdiones already present within the system, by use of elevated temperature. It is thus possible to produce dimensionally stable thermosets or dimensionally stable crosslinked composite components.
Abstract:
A high-reactivity polyurethane composition useful in coatings and adhesives, contains the following components A)-D): A) 5 to 98.7 wt %, based on the total mass of the components, of at least one compound containing an uretdione group, and a free NCO content of less than 5 wt %, and an uretdione content of 2 to 25 wt %, based on i) aliphatic and/or (cyclo)aliphatic and/or cycloaliphatic polyisocyanates and ii) compounds containing hydroxyl groups; B) 0.2 to 5 wt %, based on the total mass of the components, of at least one catalyst selected from the group consisting of a substituted carbonate salt having a quaternary ammonium counterion, a substituted carbonate salt having a quaternary phosphonium counterion and mixtures thereof; C) 0.1 to 10 wt %, based on the total mass of the components, of at least one cocatalyst having at least one epoxide group; D) 1 to 90 wt %, based on the total mass of the components, of at least one polymer containing a hydroxyl group and having an OH number of between 20 and 1000 mg KOH/gram; wherein a sum of all components A)-D) is 100 wt %.
Abstract:
The present invention relates to a composition comprising (A) an isocyanate of formula (I) OCN-A-SiR1R2R3 (I), wherein A is straight-chain, branched, substituted and/or unsubstituted aliphatic hydrocarbyl of 1 to 12 carbon atoms or substituted or unsubstituted cycloaliphatic hydrocarbyl of 4 to 18 carbon atoms, wherein R1 is selected from the group comprising —O—Ralk, wherein R2 and R3 are each independently selected from the group of substituents comprising —Ralk and —O—Ralk, and wherein —Ralk is hydrocarbyl of 1 to 6 carbon atoms, and B) a Bronstedt or Lewis acid or a compound which releases a Bronstedt or Lewis acid at room temperature; and also to a process for producing a stabilized alkoxysilane-containing isocyanate comprising the step of adding a Lewis or Bronstedt acid or a compound which releases a Bronstedt or Lewis acid at room temperature to an alkoxysilane-containing isocyanate.
Abstract translation:本发明涉及包含(A)式(I)的异氰酸酯OCN-A-SiR 1 R 2 R 3(I)的组合物,其中A是具有1至12个碳原子的直链,支链,取代和/或未取代的脂族烃基或 取代或未取代的具有4至18个碳原子的脂环族烃基,其中R 1选自-O-Ralk,其中R 2和R 3各自独立地选自包括-Ralk和-O-Ralk的取代基,并且其中 - Ralk是1至6个碳原子的烃基,B)Bronstedt或Lewis酸或在室温下释放布朗斯台特或路易斯酸的化合物; 还涉及一种制备含稳定的含烷氧基硅烷的异氰酸酯的方法,包括在室温下将路易斯或布朗斯特酸或将布朗斯台德或路易斯酸释放到含烷氧基硅烷的异氰酸酯的化合物的步骤。
Abstract:
The invention relates to an aqueous composition, comprisingA a water-soluble or water-dispersible binder, or a water-soluble or water-dispersible component containing carboxyl groups, and B at least one cyclic hydroxyalkylamide.
Abstract:
The invention relates to heat-curing powder-lacquer compositions exhibiting a matte surface after curing of the coating, as well as to a simple method for production of the same.
Abstract:
The invention relates to heat-curable powder coating compositions, which after the coating has cured result in a matt surface and to a simple method for producing same
Abstract:
The invention relates to silica-containing radiation-curable formulations which in the cured state offer a particular degree of corrosion control for metallic substrates.