摘要:
Reinforced cellular or noncellular molded polyurethane parts are prepared by heating a mixture of reinforcing materials and a heat-curable composition of polyisocyanates and polyols in an open or closed mold, said composition being storage-stable at room temperature and containing, optionally, auxiliaries and additives. In said composition, the polyisocyanate is dispersed in the form of discreet particles having particle diameters from 0.1 to 150 .mu.m in the polyol and the polyisocyanate particles are deactivated on their surfaces such that from 0.01 to 20 equivalent percent of the total available isocyanate groups are deactivated and such that the ratio of free isocyanate groups to hydroxyl groups is from 0.7:1 to 2.5:1.The polyurethane molded parts are suitable for use as self-supporting trim parts, reinforcement parts, or molded parts for various applications.
摘要:
The invention relates to compositions which are storage-stable at room temperature and which can be heat-cured to form molded parts having polyurethane, polyurea, and polyisocyanurate groups, said composition containing(a) one or more polyols having a molecular weight of from 400 to 10,000 and a functionality of from 2 to 8,(b) at least one polyfunctional compound having a molecular weight of 62 to 400 and being selected from the group consisting of aliphatic hydroxyl compound, cycloaliphatic hydroxyl compounds, aromatic amino compounds, or mixtures thereof, and(c) an organic polyisocyanate which is present in the form of discrete particles, which are deactivated on their surfaces and are dispersed in the liquid component, and depending on the product needs,(d) catalysts,(e) blowing agents,(f) reinforcing materials, and(g) auxiliaries and additives,The single-component systems are used for the preparation of cellular or noncellular, optionally reinforced polyurethane, polyurea, and/or polyisocyanurate group-containing molded parts.
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:
A mercury-free discharge lamp with an electrical power consumption of less than 35 Watts may include a translucent discharge vessel which has a discharge space into which electrodes protrude for generating a gas discharge, wherein metal halides and ignition gas are contained in the discharge space, wherein the metal halides are present in a quantity in the range from 5 milligrams to 15 milligrams per 1 milliliter of discharge space volume in the discharge space.
摘要:
The present invention relates to a method for cultivating sugar cane comprising cutting the stalk of an adult sugar cane plant into pieces, placing the stalk pieces containing at least one node in a humid medium, removing the shoots emerged from the nodes of the stalk or of the stalk pieces, optionally removing the newly emerged shoots, where this step can be repeated one or several times, removing the newly formed shoots when they are 10 to 60 cm long in such a way that they comprise meristematic tissue, planting these shoots in a growth medium, growing seedlings from the shoots at a temperature of at least 15° C., and 10 to 120 days after planting the shoots, planting the seedlings grown from the shoots to the field if the growth medium is not a field, or, in case the growth medium is a field, exposing the seedlings obtained from the shoots to ambient conditions.
摘要:
In an apparatus for singling sheet material, multiple picks are avoided by a retaining device ensuring that sheet material entrained with the sheet to be singled is retained not only on one side but also on the other side of the sheet to be singled. While the first retaining device is located opposite a singling gap of the singling device and is continually effective, the second retaining device acts before, or in, the singling gap from the other side of the singling gap and is only activated after the sheet to be singled is reliably grasped by the singling device, and deactivated when it has left the singling gap.
摘要:
There is described an apparatus for guiding a value document along a portion of a transport path in a specified transport direction, having a film forming device which is configured for respectively forming on mutually opposing sides of the transport path portion a film of gas flowing in the transport direction, the film extending at least over the total width of the transport path portion and thus the total width of value documents transported along the transport path, so that the value documents are guided between the gas films.
摘要:
The invention concerns a method for cooling or quenching slabs and sheets (2) with water in a cooling pond (1, 14) wherein the slabs and the sheets (2), previously set upright by a tilting device (18), are lowered and temporarily maintained in position on edge. The inventive method is characterized in that the slabs and the sheets are sprayed with the cooling water. Therefor, the cooling pond (1) has, on both sides of the lowered slabs and sheets (2) jet devices (10; 11a, 11b) directed towards the surfaces of the large sides of the slabs or sheets and connected to a cooling water circuit which comprises means for reducing the water filling supply from a maximum upper water level (13b) to a lower water level (13a).
摘要:
The invention relates to an apparatus for canceling, in particular destroying, sheet material, in particular bank notes. The apparatus includes at least one canceling means to which the sheet material to be canceled is fed, in which the fed sheet material is canceled, in particular destroyed, and from which the canceled sheet material is discharged. The apparatus also includes at least one supervising means for monitoring the sheet material being discharged or having been discharged from said canceling means. For improved monitoring of the cancellation of sheet material, in particular with respect to malfunctions, there is provided at least one monitoring means for monitoring the fed sheet material. The fed sheet material is compared to the sheet material being discharged or having been discharged in an evaluation means.
摘要:
The invention relates to a device (1) for pushing metallic goods (2) off and onto a conveyor (3) in a direction (S) transverse to a conveying direction (F), wherein the device (1) has a displacement arm (5) displaceable relative to a stationary stand (4) and in an end region (6) of which, at least one gripping element (7, 8) is arranged for gripping the metallic goods (2). In order to be able to effect pushing of goods off of a conveyor and thereon in a simple and space-saving manner, the invention is characterized in that the displacement arm has at least two arm sections displaceable within each other in a telescopic manner.