摘要:
A thermal protection system suitable as a heat shield for a space vehicle includes a flexible insulation mat that is adhesively bonded onto the outer skin of the space vehicle, a cover layer made of at least one ply of a ceramic fiber composite material secured onto the insulation mat, and a coating of an inorganic material applied onto an outer surface of the ceramic cover layer. The cover layer is secured to the insulation mat by adhesive bonding, stitching with ceramic threads or the like, or by a snap fastener button connection. The ceramic fiber composite materials of the cover layer include inorganic fibers which are preferably oxides, carbides or mixtures thereof embedded in a matrix of the same compositional components, whereby the components can be selected appropriately depending on the requirements of the particular application. The overall thermal protection system remains flexible, lightweight, and highly effective for thermal shielding, so that it may be used not only on the relatively cooler portions of the space vehicle, but also on the most highly thermally loaded areas such as the nose and the leading edges of wings and the like.
摘要:
The present invention relates to compositions that may be cured under the action of UV radiation and contain A) 40 to 80 parts by weight of a polyester resin component containing one or more ethylenically unsaturated polyester resins prepared from a carboxylic acid component containing a 1,2-alkenyl dicarboxylic acid monodicyclopentenyl ester and fumaric acid, maleic acid and/or maleic anhydride and an alcohol component containing a dyhydric alcohol, B) 20 to 60 parts by weight of a copolymerizable monomer such as styrene and C) 0.1 to 10 parts by weight of a photoinitiator. The present invention also relates to coated substrates, in particular wood or imitation wood, prepared from these compositions at an application viscosity of less than 60 seconds measured at 23° C. in a DIN 4 cup to DIN 53211 under the action of UV radiation.
摘要:
UV-curable coating compositions containing urethane acrylates prepared from hydroxyalkyl acrylates and low-viscosity polyisocyanates having isocyanurate groups, low-viscosity acrylic ester components as reactive diluents, initiators, and optionally solvents and/or other known additives, and their use for coating molded articles of thermoplastic polycarbonates.
摘要:
Mixture of a polythiophene preparation which contains a polythiophene salt polythiophene.sup..sym. An.sup..crclbar. in which the polythiophene contains positively charged and uncharged recurring units of the formula ##STR1## in which R.sub.1 and R.sub.2 independently of one another stand for hydrogen or a C.sub.1 -C.sub.4 alkyl group or together form an optionally substituted C.sub.1 -C.sub.4 alkylene radical, preferably a methylene radical optionally substituted with alkyl groups, an ethylene-1,2 radical optionally substituted with C.sub.1 -C.sub.12 alkyl groups or phenyl groups, a propylene-1,3 radical or a cyclohexylene-1,2 radical, andAn.sup..crclbar. denotes a polyanion,and coating compositions which are curable by ionising radiation, and the use thereof in order to produce scratch-resistant electrically conductive coatings.
摘要:
A protection system for a competition vehicle for a competition vehicle driver has shoulder belt parts provided with one shoulder air bag respectively which can be inflated within fractions of seconds and can be emptied again in an energy consuming manner. In the inflated condition, the shoulder air bags are supported on the driver's shoulder regions and support a protective helmet from below against a lateral tilting.
摘要:
Graft copolymers obtained by(A) polymerizing 10 to 89 wt % of a mixture consisting essentially of either(a1) from 70 to 99.89 wt % of a C.sub.1 -C.sub.18 -alkyl ester of acrylic acid,(a2) from 0.1 to 10 wt % of a polyfunctional monomer,(a3) from 0 to 29.89 wt % of an ethylenically unsaturated monomer which differs from (a1) and (a2), is copolymerizable therewith and carries no acid group and(a4) from 0.01 to 10 wt % of a copolymerizable monomer containing at least one acid groupor(a5) from 49.99 to 99.99 wt % of at least one diene,(a6) from 0 to 50 wt % of a monomer which is copolymerizable therewith and carries no acid group and(a7) from 0.01 to 10 wt % of a copolymerizable monomer containing at least one acid groupin the presence of from 1 to 80 wt % of a cross-linked silicone rubber to form a copolymer A,and(B) polymerizing 10 to 89 wt % of a mixture consisting essentially of(b1) from 50 to 99.99 wt % of a styrene compound of the formula (I) ##STR1## where R.sup.1 and R.sup.2 independently of one another are each hydrogen, C.sub.1 -C.sub.8 -alkyl, etc.(b2) from 0 to 50 wt % of a methacrylonitrile, acrylonitrile, methacrylic acid, acrylic acid, maleic anhydride, etc. monomerand(b3) from 0.01 to 20 wt % of a copolymerizable monomer containing at least one basic groupin the presence of the graft copolymer (A) and used to prepare thermoplastic molding materials.
摘要:
Within a cell-oriented communication network, a switching equipment (CCa) located at the start of a path pair duplicates a message cell stream supplied thereto for redirection. The message cell streams resulting therefrom are separately supplied to a switching equipment (CCb) located at the end of the path pair via an active path (AP) and via an alternate path (EP) of the path pair allocated thereto. A decentralized synchronization means (SY) or, respectively, a plurality of decentralized synchronization means (SY1, SY2 or, respectively, SY3, SY4) is or, respectively, are provided therein, a synchronization of the two message cell streams ensuing therein while initially forwarding the message cell stream of the active path. After such a synchronization, only the message cell stream of the alternate path is then forwarded.
摘要:
Graft copolymers obtained by(A) polymerization of from 10 to 89% by weight of a mixture consisting essentially of either(a1) from 70 to 99.89% by weight of a C.sub.1 -C.sub.18 -alkyl ester of acrylic acid,(a2) from 0.1 to 10% by weight of a polyfunctional monomer,(a3) from 0 to 29.89% by weight of an ethylenically unsaturated monomer which differs from (a1) and (a2), is copolymerizable therewith and carries no acid group and(a4) from 0.01 to 10% by weight of a copolymerizable monomer containing at least one acid group or(a5) from 49.99 to 99.99% by weight of at least one diene,(a6) from 0 to 50% by weight of a monomer which is copolymerizable therewith and carries no acid group and(a7) from 0.01 to 10% by weight of a copolymerizable monomer containing at least one acid group in the presence of from 1 to 80% by weight of a crosslinked silicone rubberand to form a graft copolymer A,(B) polymerization of from 10 to 89% by weight of a mixture consisting essentially of(b1) from 50 to 99.99% by weight of a styrene compound of the formula (I) ##STR1## where R.sup.1 and R.sup.2 independently of one another are each hydrogen, C.sub.1 -C.sub.8 -alkyl, etc.,(b2) from 0 to 50% by weight of a methacrylonitrile, acrylonitrile, methacrylic acid, acrylic acid, maleic anhydride, etc. monomer and(b3) from 0.01 to 20% by weight of a copolymerizable monomer containing at least one basic group in the presence of the graft copolymer (A).
摘要:
The present invention relates to a process for the production of a polyurethane containing acryloyl groups byI) reacting at an NCO:OH equivalent ratio of 1.8:1 to 2.5:1, based on starting components a) and b),a) 0.25 to 0.5 moles of a diisocyanate component comprising one or more organic diisocyanates other than hexamethylene diisocyanate which have a molecular weight below 300 and contain aliphatically and/or cycloaliphatically bound isocyanate groups withb) 0.2 to 0.55 moles of an alcohol component containing acryloyl groups and comprising one or more monohydric alcohols containing acryloyl groups and having a molecular weight of 116 to 144II) mixing the product of step I) withc) 0.5 to 0.75 moles of hexamethylene diisocyanate,III) reacting the resulting mixture withd) 0.1 to 0.65 moles of an alcohol component containing acryloyl groups and comprising one or more monohydric alcohols containing acryloyl groups and having a molecular weight of 116 to 144 ande) 0.15 to 0.45 moles of one or more branched monohydric or dihydric alcohols which have a molecular weight of 132 to 2000 and may contain ether and/or ester groups, wherein components d) and e) may be added in any order or in admixture andIV) reacting the product from step III withf) 0.1 to 1.2 moles of one or more at least trihydric alcohols having a molecular weight of 92 to 2000, wherein the NCO:OH equivalent ratio, based on all of the starting components a) to f), is 0.7:1 to 1:1.