摘要:
The present invention is directed to a process for the preparation of foam-containing polyurethane (urea) masses comprising reacting an isocyanate prepolymer containing cation groups with water in the presence of fillers. The isocyanate prepolymer is prepared by first i) reacting a polyisocyanate with a first polyol which contains partly or completely quaternized tertiary nitrogen, said polyol being prepared by reacting a tertiary amine containing compound with from 3 to 8 moles of propylene oxide per mol of nitrogen to thereby form a semi-isocyanate prepolymer and then ii) reacting said semi-isocyanate prepolymer with a second polyol different from said first polyol, to form said isocyanate prepolymer.
摘要:
In a method for starting an internal combustion engine (60) having multiple combustion chambers (62, 64, 66, 68), wherein said internal combustion engine (60) has a starting system (50) and is operated using a start-stop function, and wherein said starting system (50) is actuated after a stop phase in operation of said internal combustion engine (60) to restart said internal combustion engine (60), a combustion chamber (62, 64, 66, 68) to be ignited first of the multiple combustion chambers (62, 64, 66, 68) is determined upon a restart of the internal combustion engine (60), and after a first ignition of the combustion chamber (62, 64, 66, 68) to be ignited first, speed data for the internal combustion engine (60) are detected, and a starter release of the starting system (50) is caused if the detected speed data meet a predetermined starter release criterion.
摘要:
Polyether polyols can be prepared by reacting polyols with epoxides in the presence of basic catalysts, by treating the polyether polyols containing the basic catalysts with OH-functional solid compounds of metals of groups III to VIII of the periodic system of the elements (Mendeleyev), the compounds being insoluble in the polyether polyols and having BET surface areas of from 10 to 1000 m2/g, isolating the solid inorganic compounds laden with the basic catalysts from the polyether polyol and using them in the reaction of polyols with epoxides, or bringing the isolated inorganic compounds laden with the basic catalysts into contact with the polyols that are to be used in the reaction with epoxides, separating those polyols from the inorganic compounds and delivering them to the reaction with epoxides.
摘要:
Polyol formulations, containing polyether polyols possessing 40 to 80 wt. % of tertiary amino groups and having an OH number of 300 to 500, preferably 350 to 420, obtainable by addition of exclusively propylene oxide to o-toluene diamine, which contain cyclopentane and/or n- and/or i-pentane and/or hydrofluoroalkanes as blowing agent, are used for the manufacture of rigid polyurethane foams by reacting with organic polyisocyanates, optionally further compounds with at least two hydrogen atoms reactive to isocyanates, optionally in the presence of water, and further blowing agents known per se as well as conventional auxiliaries and additives.
摘要:
Polyol formulations, containing polyether polyols possessing 40 to 80 wt % of tertiary amino groups and having an OH number of 300 to 500, preferably 350 to 420, obtainable by addition of exclusively propylene oxide to o-toluylenediamine, which contain cyclopentane and/or n- and/or i-pentane and/or hydrofluoro alkanes as blowing agent, are used for the manufacture of rigid polyurethane foams by reacting with organic polyisocyanates, optionally further compounds with at least two hydrogen atoms reactive to isocyanates, optionally in the presence of water, and further blowing agents known per se as well as conventional auxiliaries and additives.
摘要:
Leather treatment agent containing a mixture a) of a carboxylic acidX--COOH Iwherein X represents--[R--CO--Z--(R'--Z).sub.a ].sub.b --CO--R--COOH 1or--R"--(Z--R').sub.c --Z--CO--R--COOH 2and the symbols have the meaning described in more detail in the description, and b) of a compound containing at least one primary, secondary or tertiary amino group, with a molecular weight of 200-20,000, are used in processes for tanning, pretanning, retanning, dyeing or fat liquoring pelts or pretanned leather or fully tanned leather.
摘要:
Flexible polyurethane foams having increased compression hardness are produced by reacting an organic polyisocyanate with a mixture of polyols in the presence of a blowing agent and optionally known additives such as catalysts, emulsifiers, etc. The mixture of polyols is (1) 75-95 wt % polyether polyol with terminal OH groups having a functionality of from 2 to 4 and an OH number of from 25 to 60 and (2) 5-25 wt % polyether polyol having a functionality of at least six and an OH number of from 150 to 200 which is the reaction product of an alcohol having a functionality of at least six and propylene oxide which has been modified to contain 5-50 wt % terminal ethylene oxide groups. These foams are useful in furniture applications.
摘要:
The instant invention is directed to stable dispersions and the process of their manufacture. The stable dispersions of the instant invention comprise polyureas and/or polyhydrazo-dicarbonamides as the disperse phase in an hydroxyl group containing material selected from the group consisting of polyethers, polyesters, polyester amides, polycarbonates, and mixtures thereof, and are produced by reacting (1) organic polyisocyanates with (2) polyamines containing primary and/or secondary amino groups and/or hydrazines and/or hydrazides in (3) the hydroxyl group containing material. Component (3) may also contain relatively low molecular weight polyols and/or inert organic solvents. Components (1), (2) and (3) are continuously introduced into a flow mixer in such a quantity that the average residence time in the mixer is less than ten minutes.
摘要:
The invention relates to a method for stopping an internal combustion engine, wherein an amount of air which is supplied via an air metering device of the internal combustion engine, in particular a throttle flap (100), is reduced after a stopping order has been detected. According to the invention, the amount of air which is supplied via the air metering device of the internal combustion engine is again increased when the detected speed (n) of the internal combustion engine falls below a predefinable speed threshold value (ns), wherein an intake cylinder (ZYL2) to which the amount of air is supplied does not enter any working cycle after the amount of supplied air has been increased.
摘要:
In a method for starting an internal combustion engine (60) having multiple combustion chambers (62, 64, 66, 68), wherein said internal combustion engine (60) has a starting system (50) and is operated using a start-stop function, and wherein said starting system (50) is actuated after a stop phase in operation of said internal combustion engine (60) to restart said internal combustion engine (60), a combustion chamber (62, 64, 66, 68) to be ignited first of the multiple combustion chambers (62, 64, 66, 68) is determined upon a restart of the internal combustion engine (60), and after a first ignition of the combustion chamber (62, 64, 66, 68) to be ignited first, speed data for the internal combustion engine (60) are detected, and a starter release of the starting system (50) is caused if the detected speed data meet a predetermined starter release criterion.