摘要:
The present invention relates to a process for producing a rigid polyurethane-polyisocyanurate foam C, comprising the step of reacting (i) an isocyanate-terminated prepolymer B with (ii) an activator component A comprising at least one trimerisation catalyst A1 and at least one blowing agent A3 in a reaction mixture to form a foam, characterised in that—there is used an isocyanate-terminated prepolymer B obtained from a reaction of an isocyanate B1 having a mean isocyanate functionality of from ≧2.3 to ≦2.9 with a polyol component B2, and—the activator component A comprises water as the blowing agent A3 in an amount of from ≧5 wt. % to ≦50 wt. %,—the isocyanate index in the reaction mixture is in a range of from ≧400 to ≦500, and—the isocyanate content of the prepolymer B is in a range of from ≧21 wt. % to ≦30 wt. %, based on the total mass of the prepolymer B, and—wherein in the reaction of the prepolymer B and the activator component A a conversion contribution to polyisocyanurate of ≦75% is achieved. Rigid foams C so produced have good flame retarding properties while at the same time having good insulating properties and stability properties. The present invention relates further to a rigid polyisocyanurate foam C produced by the process according to the invention, to the use of such a rigid polyisocyanurate foam C in the production of heat-insulating structural components, and to a heat-insulating structural component comprising such a rigid polyurethane-polyisocyanurate foam.
摘要:
In a static micromixer for mixing at least two fluids including a flow guide structure having a longitudinal axis extending in the general flow direction of the fluids through the guide structure, separate fluid admission areas disposed at the entrance end of the flow guide structure and a mixing chamber disposed at the exit end of the flow guide structure, the flow guide structure is formed by foils of a thickness of about 100 .mu.m disposed on top of each other and having parallel grooves extending in one foil from one of the fluid admission areas at an angle with respect to the general fluid flow direction through the flow guide structure to the mixing chamber and in an adjacent foil from another of the fluid admission areas to the mixing chamber such that in the mixing chamber the fluid exits of different foils are disposed adjacent each other, the grooves having a width of less than 250 .mu.m and being spaced from each other by less than 70 .mu.m to provide for the fluid flow filaments entering the mixing chamber at different angles and closely adjacent each other.
摘要:
In a micromembrane pump with pump housing top and bottom parts and a membrane structure disposed between the housing top and bottom parts such that pump chambers, valves, flow channels and a cavity system are formed between the membrane structure and the housing parts, heating means are disposed on the membrane structure in the area of the pump housing for operating said pump and the cavity system is filled with a cement for joining the membrane and the housing parts.
摘要:
The wire card napping machine has at least one driven cylinder, with several pick-up devices, each of which is equipped with at least one napping roller of a different roller type and is embedded in the side disks of the cylinder, it being possible to rotate at least one pick-up device by means of an adjusting device. The adjusting device has a lifting device, which can be operated in a controlled manner and to which a segment bearer, which can be moved by the lifting device between a starting position and an operating position, which brings about a pick-up device that is to be rotated in a defined angle, is connected in hinged fashion and the segment bearer lies in its operating position against a wheel, which is disposed firmly at the pick-up device that is to be rotated. The adjusting device has assigned to it an unlocking device, which has a further lifting device, which can be operated in a controlled manner, to which an unlocking segment, which can be moved by the further lifting device between a starting position and an operating position, which brings about the unlocking of the pick-up device that is to be rotated through a defined angle, is connected in hinged fashion. The unlocking segment, in its operating position, is connected in hinged fashion to a locking device, which is disposed at a pick-up device that is to be rotated, before the pick-up device in question is rotated to bring about the unlocking.
摘要:
Predominantly open-cell, cold-formable, compressed rigid polyurethane foams are produced from an isocyanate component satisfying specified criteria and an isocyanate-reactive component composed of at least 5 polyhydroxyl compounds satisfying specified criteria. These foams are produced by a double conveyor belt process. The foams of the present invention are particularly useful for the manufacture of soft trim for cars, especially inside roof linings, roof stiffening boards and column trim.
摘要:
An over ride clutch having an inner and outer race, and clutch rollers disposed between the races and adapted for free-rolling or wedge engagement, depending on relative rotation of races. A centrifugal pin is located in the outer peripheral surface of the outer race, and this actuates a rocker arm, which in turn actuates driver rods, which are not affected by centrifugal force, which rods are capable of forcing the clutch roller into wedging condition.
摘要:
The invention pertains to a conductor rail (1), particularly an enclosed conductor rail, with a housing (2) and at least one conductor band (4, 6) extending therein, as well as a connector (3) for connecting the conductor bands (4, 6) of adjacent segments (1a, 1b) of the conductor rail, wherein the electrically conductive conductor bands (4, 6) are bent outward at the ends of the conductor rail segments so as to electrically connect the conductor bands. In order to easily and manually produce a connection between conductor rail segments of such a conductor rail with the fewest components possible and such that a high system reliability is preserved, the invention proposes that the conductor bands (4, 6) be bent outward by 180° and that the connector (3) be realized in the form of a clamping connector that encompasses and presses the bent ends of the conductor bands against one another in the region of their bend forming a contact surface (5).
摘要:
The present invention is directed to a spring energized cage centering device for a bi-directional overrunning clutch. The clutch includes an inner race, an outer race, and a cage disposed between them. A biasing member is disposed between a cavity formed in the outer periphery of the inner race and a pocket formed in the inner periphery of the cage which permits rotational movement between the inner race and the cage, but rotationally biases the cage with respect to the inner race toward a neutral position. In one preferred embodiment, the cavity extends through the centerpoint of the inner race to form two openings in the inner race, the biasing member extending through the cavity and radially outwardly from the openings to engage the cage at two different circumferential locations.
摘要:
In a micro diaphragm pump which has a pump body consisting of two parts, one part including two valve chambers with a pump chamber disposed therebetween and in communication with the valve chambers by passages, a diaphragm extends across and closes the chambers and forms, in the areas of the valve chambers, valve membranes for inlet and outlet valves which are integrally formed, both on one side of the diaphragm, both pump body parts being sealingly connected to the diaphragm.