Production process for low-point horizontally-poured polyurethane for heat insulation pipeline

Abstract

The invention provides a production process for a low-point horizontally-poured polyurethane for a heat-insulating pipeline. The production process comprises the following steps: cleaning a gun head needle valve of a foaming machine and a black material filter screen and a white material filter screen of a premixing box of the foaming machine; injecting black materials into a black material tank,and injecting white materials into a white material tank; enabling the periphery of a to-be-filled inner container to be connected to an inner ring of a to-be-filled outer shell through an outer shellsupporting mold in a sleeving mode. preheating the relevant device through a temperature control cabinet; premixing the black material and the white material according to a specific ratio through thepremixing box of the foaming machine; injecting a mixture of a black material and a white material into the gap between the shell and the inner container through an injection gun head of the foamingmachine; carrying out pressure maintaining curing; and cooling the foaming machine and the shell supporting mold through the temperature control cabinet. According to the production process , the problems that when the temperature of a foaming material in summer is too high, the foaming material is easy to react for a short time, the foaming speed is high, and the foaming density is not uniform are solved.

Description

technical field [0001] The invention belongs to the technical field of heat-insulating pipeline construction, and in particular relates to a production process for horizontally pouring polyurethane at low points of heat-insulating pipelines. Background technique [0002] With the decrease of world energy and the increasing demand, energy saving, emission reduction and environmental protection have become the global development trend. National and local governments also vigorously promote the development, application and industrialization of energy saving, emission reduction and environmental protection products. In recent years, with the rapid development of my country's building energy-saving market, polyurethane rigid foam insulation products have been widely used in the field of building insulation and waterproofing, and have become one of the leading thermal insulation and energy-saving products in the market. [0003] At the same time, with the centralization of urban h...

AI Technical Summary

Problems solved by technology

[0006] However, since the last production process of high-temperature prefabricated direct-buried insulation pipes is foam insulation, uneven density at both ends of the pipe, bubbles, and bulges often occur after injection, resulting in unstable product quality. During the period of backfilling and on-site pipeline backfilling, there are occasional bulges or unqualified random inspections of the density of the insulation layer