摘要:
Chlorofluorocarbon-free urethane-containing, soft-elastic moldings having a cellular core, a compacted peripheral zone and an essentially pore-free smooth surface are produced by reactinga) an organic and/or modified organic polyisocyanate withb) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms and, if desired,c) a low-molecular-weight chain extender and/or crosslinking agent,in the presence ofd) a blowing agent,e) a catalyst,f) a crystalline, microporous molecular sieve having a cavity diameter of less than 1.3 nm and comprising metal oxides or metal phosphates, and, if desired, further additives andg) assistants,in a closed mold with compaction, expediently by RIM.
摘要:
A process for the production of chlorofluorocarbon-free, urethane- or urethane- and urea-containing, soft-elastic, semirigid or rigid moldings having a cellular core and a compacted peripheral zone and an essentially pore-free, smooth surface involves reactinga) an organic and/or modified organic polyisocyanate withb) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired,c) a low-molecular-weight chain extender and/or cross-linking agent,in the presence ofd) a blowing agent,e) a catalyst,f) at least one microporous activated charcoal and/or microporous carbon molecular sieve which preferably has a mean pore diameter with a frequency of occurrence of more than 40% in the range from 0.3 to 3 nm, a pore volume of from 0.20 to 1.4 ml/g and a BET surface area of from 500 to 2500 m.sup.2 /g, and, if desired, further additives andg) assistants,in a closed mold with compaction.
摘要:
A process for the production of fluorochlorocarbon-free, urethane-containing, soft-elastic, semirigid or rigid moldings having a cellular core and a compacted peripheral zone and an essentially pore-free, smooth surface involves reactinga) an organic and/or modified organic polyisocyanate withb) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired,c) a low-molecular-weight chain extender and/or cross-linking agent,in the presence ofd) a blowing agent,e) a catalyst,f) at least one amorphous, microporous silica gel which preferably has a mean pore diameter with a frequency of occurrence of more than 40% in the range from 0.1 to 10 nm, a pore volume of from 0.15 to 1.8 ml/g and a BET surface area of from 200 to 900 m.sup.2 /g, and, if desired, further additives andg) assistants,in a closed mold with compaction.
摘要:
In a process for producing polyurethane foams, preferably semirigid polyurethane foams and flexible, semirigid and rigid polyurethane integral foams,a) at least one modified or unmodified organic polyisocyanate is reacted withb) at least one relatively high molecular weight compound containing at least two reactive hydrogens and, if desired,c) low molecular weight chain extenders and/or crosslinkers in the presence ofd) blowing agents, preferably water and/or (cyclo)alkanes,e) a catalyst mixture comprising, according to the invention,e') from 35 to 65 parts by weight of di-n-octyltin bis(2-ethylhexyl thioglycolate) ande") from 65 to 35 parts by weight of mono-n-octyltin tris(2-ethylhexyl thioglycolate) and also, if desired,e'") cocatalysts selected from the group of tertiary amines, alkali metal and alkaline earth metal salts of monocarboxylic acids having from 1 to 20 carbon atoms andf) if desired, additives,with the reaction for forming the polyurethane integral foams being carried out in a closed mold with compaction at a degree of compaction of from 1.4 to 8.3.
摘要:
The invention relates to a child seat (1) which can be fastened to a vehicle seat of a motor vehicle by means of a three-point seat belt (14). It is also possible for the child seat also to be connected to the supporting structure of the vehicle via an ISOFIX fastening system (17). The three-point seat belt (14) is equipped with a tightening device. The child seat (1) has its own belt system for securing a child sitting on the child seat. According to the invention, it is proposed that the three-point seat belt (14) be coupled to the belt system of the child seat (1). This coupling makes it possible, during a preventative or crash-active tightening of the three-point seat belt (14), for the belt system of the child seat (1) also to be tightened without a separate tightening device being necessary.
摘要:
Rigid polyurethane foams, preferably semirigid polyurethane foams, are produced by reacting an organic and/or modified organic polyisocyanates with relatively high molecular weight polyhydroxyl compounds and, optionally, low molecular weight chain extenders and/or crosslinkers in the presence of water or mixtures of water and physically acting blowing agents, optionally, catalysts, at least one additive selected from the group consisting of sulfonate salts of an acid group-containing alkylene oxide polymer, a phosphonate salt of an acid group-containing alkylene oxide polymer, and mixtures thereof, additional other additives and optionally, auxiliaries. The polyurethane foams produced by this process can be used to produce composite comprising at least one covering layer and at least one layer comprising a rigid or semirigid polyurethane foam produced by the process of the present invention.
摘要:
The invention relates to transparent, substantially compact polyurethane casting compositions, sterilizable with superheated steam, which are prepared by the reaction of:A) modified diphenylmethane diisocyanates (A) that are liquid at 23.degree. C. and are in turn are obtained by the reaction of1) a diphenylmethane diisocyanate isomer mixture, which in terms of 100 parts by weight comprises 60 to 90 parts by weight of 4,4'-diphenylmethane diisocyanate, 40 to 8 parts by weight of 2,4'-diphenylmethane diisocyanate, and 0 to 5 parts by weight of 2,2'-diphenylmethane diisocyanate with2) at least one polyoxypropylene polyol initiated with glycerine and/or trimethylol propane, having a molecular weight of 350 to 800 with a ratio of NCO:OH groups of 2.5:1 to 15:1, withB) at least one compound having at least two reactive hydrogen atoms in the presence or absence ofC) catalysts,as well as to a process for preparing the polyurethane casting compounds and their use for medical-technical articles.
摘要:
Sheet-like reinforced materials consisting ofA. a core layer comprising a sheet-like textile structure, preferably a glass fiber mat,B. a plastic matrix composed of a nylon which has been polymerized under alkaline conditions and penetrates both the core layer and the surface layer of layers,are produced batchwise by the RIM method or continuously on a double-belt press by impregnating the sheet-line textile structure and the foam sheets with a lactam melt and polymerizing the latter. The reinforced material can be used for the production of finished articles having a satisfactory surface, for example for the automotive or aircraft industry.
摘要:
The invention relates to a one-shot process for the preparation of cellular or noncellular polyurethane polyurea parts having a modulus of flexural elasticity greater than 600 N/mm.sup.2 and densities of from 0.8 to 1.2 g/cm.sup.3 using the reaction injection molding technique, by reacting organic polyisocyanates, a polyol component, aromatic diamines, additional chain extenders and/or cross-linking agents in the presence of catalysts and optionally blowing agents, auxiliaries and/or additives, wherein the polyol component is a mixture containing(i) from 95 to 60 percent by weight of at least one compound selected from the group consisting of polyols, polyether polyamines, polyesteramides, and their mixtures having functionalities of from 2 to 6 and a molecular weight of from 1000 to 8000 and(ii) from 5 to 40 percent by weight of a least one aromatic and/or aromatic-aliphatic polyester polyol having a functionality of from 2 to 3 and a molecular weight of from 254 to 700, wherein the percents by weight are based on the total weight of the polyol component.
摘要:
Thermoplastic polybutylene terephthalate molding compositions of improved stability due to the presence of from 0.01 to 10 percent by weight, based on the total molding composition, of a lactam derivative.