摘要:
The invention relates to a process for insulating pipes by applying a rigid polyurethane foam as an insulating layer and optionally an external top coating by the rotational casting process. The rigid polyurethane foam is obtained by a) an aromatic polyisocyanate, b) an organic polyhydroxyl compound, c) an aliphatic, cycloaliphatic or aromatic polyamine and/or polyimine having a molecular weight of from 32 to 1,000 as the cross linking agent in the presence d) a blowing agent, and optionally in the presence of e) known auxiliary substances and additives and in the presence of f) one or more compounds having a molecular weight of from about 166 to about 1,000 and being of the general formula ##STR1## wherein n represents an integer between 2 and 9, preferably 2 and 3,R.sup.1 signifies hydrogen, a C.sub.1 -C.sub.9 alkyl radical or a ##STR2## R.sup.2 signifies hydrogen, and R.sup.3 and R.sup.4 signify hydrogen or methyl.
摘要:
A process for insulating pipes comprises applying at least one layer of a polyisocyanurate plastic and then at least one layer of rigid polyurethane foam to a steel pipe. The foam is covered with an outer layer.
摘要:
The invention provides a process for preparing flexible to semi-rigid polyurethane moulded items with compacted edge zones with given hardness and a much more flexible cellular core, so-called integral foams, in which physical blowing agents from the set comprising C6 hydrocarbons are used.
摘要:
The invention relates to moulded parts provided with reinforcing materials and consisting of polyurethane urea elastomers having defined urea and urethane contents, and to the use thereof.
摘要:
The invention relates to compact plastics mouldings having bulk densities of >1000 kg/m3, high strength, bending strength and high heat resistance, and to their use.
摘要翻译:本发明涉及堆密度> 1000kg / m 3,高强度,弯曲强度和高耐热性及其使用的紧凑型塑料模制品。
摘要:
The present invention relates to a multi-layered plastic material, a process for the preparation thereof, and the use thereof. A multi-layered plastic material having a bending modulus of elasticity of >250 N/mm2, comprising a polyurethane support layer containing red phosphorus and/or melamine and/or melamine derivatives, and laminated thereon at least one polyurethane cover layer containing expandable graphite.
摘要翻译:本发明涉及一种多层塑料材料,其制备方法及其用途。 具有> 250N / mm 2的弯曲弹性模量的多层塑料材料包括含有红磷和/或三聚氰胺和/或三聚氰胺衍生物的聚氨酯支撑层,并且在其上层压至少一个含有可膨胀石墨的聚氨酯覆盖层。
摘要:
The invention relates to antistatic and electrically conductive polyurethanes containing conductive carbon blacks and carbon fibers, and the use thereof.
摘要:
The description relates to production of rigid foamed plastics containing urethane groups, by use of a blowing-agent mixture containing 5 to 50 parts by weight of C3 and/or C4 alkanes and 50 to 95 parts by weight of cyclopentane. There is also a description of use of the thus-produced rigid foamed plastics as composite components or for foam filling of cavities in refrigerator construction.
摘要:
A process for preparing rigid expanded materials containing urethane and optionally urea and isocyanurate groups, characterised in that a polyurethane rigid foam is prepared by reactinga) an aromatic polyisocyanate withb) a polyol component with on average at least 3 hydrogen atoms which can react with isocyanates, containing1) 30 to 80 wt. % of an aromatic amine started polyether with a molecular weight of 300 to 800 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide2) 10 to 40 wt. % of a substantially sucrose started polyether with a molecular weight of 400 to 1,000 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide3) 5 to 30 wt. % of a propylene glycol started polyether with a molecular weight of 500 to 1,500 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide4) n-pentane and/or i-pentane as blowing agent5) water6) optional auxiliary agents and additives,wherein the sum of the wt. % of components 1), 2) and 3) is 100, is described.
摘要:
Polyurethane articles having a compressed shell and a cellular core, so-called integral skin foams are produced from an isocyanate component which includes one or more inorganic zeolites.