High-density rigid polyurethane foam material prefabricated heat insulating pipeline and prefabricating method

Abstract

A high-density rigid polyurethane foam material prefabricated heat insulating pipeline and a prefabricating method. The heat insulating pipeline is composed of an inner layer working steel pipe, a middle high-density polyurethane heat insulating layer, and an outer layer protective pipeline. The high-density polyurethane heat insulating layer is formed by uniformly mixing combined polyether, a foam stabilizer, a catalyst, a foamer and polyisocyanate and pouring the mixture. During prefabrication, the weighed polyether polyol, foam stabilizer, catalyst and foamer are added into a mixing kettle and are stirred for 30-60 min until uniformly mixed. The temperature of a blank material and the polyisocyanate is regulated to 20-25 DEG C. The blank material and the polyisocyanate are uniformly mixed according to the mass ratio of 1:1-1.3 by means of a high-pressure foaming machine, and the mixture is poured into a pipeline prefabricating cavity die so that the polyurethane stock liquid is foamed in the sealed space under a free pressure to form the high-density polyurethane heat insulating layer. In the method, water serves as the foamer, so that the method is zero in ozone depletion potential. The polyurethane heat insulating layer has high density and high compressive strength, and satisfies the function of supporting the working steel pipe.

Description

Technical field [0001] The invention belongs to a thermal insulation technology, in particular to a prefabricated pipeline prepared by using high-density polyurethane rigid foam material, specifically a thermal insulation pipe prefabricated with water as a foaming agent for high-density polyurethane rigid foam material and a preparation method thereof . [0002] technical background [0003] With the acceleration of my country's economic development and urbanization, the construction of the heating network as an urban infrastructure has developed rapidly. In the past ten years, prefabricated insulation pipes have developed rapidly in my country and have become the first choice for heating pipe networks. Insulation materials have developed from the early use of prefabricated mineral wool or hydrophobic perlite to polyurethane foam insulation pipes. As an insulation material, polyurethane has low thermal conductivity, relatively light weight, good dimensional stability, waterproof, s...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of insufficient pressure bearing capacity and poor high temperature resistance of the prefabricated heat preservation pipe due to the need to use a large amount of foaming agent that damages the environment when preparing the heat preservation layer of the heat preservation pipe in the prior art. Foam material prefabricated insulation pipes, while providing a corresponding pipeline prefabrication method, using the provided rigid foam material formula and preparation method of the present invention can be prepared to obtain a density of 60kg / m 3 Above, the compressive strength of 10% relative radial deformation is not less than 400kPa, the thermal conductivity is less than 0.03W / (m K), the high-density polyurethane insulation layer can withstand the temperature of 150°C, and the long-term service life can reach 30 years at 120°C, In addition, the present invention uses water as a foaming agent, which is non-toxic and harmless, and has zero damage to the ozone layer (ODP)

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