Demolding foaming method for polyurethane thermal insulation material for outdoor milk bins and medium and large-scale thermal insulation tanks

Abstract

The invention provides a demolding foaming method for a polyurethane thermal insulation material for outdoor milk bins and medium and large-scale thermal insulation tanks. The demolding foaming method comprises the following steps: dividing a foaming tank body into multiple layers along the height direction according to the width of mold white iron sheets, fixing a first layer of supporting module on the periphery of the first layer of the foaming tank body, and fastening the first layer of the mold white iron sheet with the inner side surface coated with a demolding agent to the outer side of the first layer of supporting module; uniformly injecting polyurethane into a space between the first layer of the foaming tank body and the first layer of the mold white iron sheet so as to foam; after the foaming, processing the second layer in a similar manner until the foaming of the whole foaming tank body is finished; carrying out pressed film foaming on upper and lower end sockets in the similar manner; and when the foaming of polyurethane is completely finished, dismounting all the mold white iron sheets, and trimming irregular sites and gaps, so as to finish the whole foaming operation. The demolding foaming method provided by the invention has the beneficial effects that the operation is simple, the working efficiency is high, the foaming effect of polyurethane can be intuitively observed, the thermal insulation effect can be guaranteed, and the aesthetic sense of the integral appearance can be further guaranteed.

Description

Technical field [0001] The invention relates to a demoulding and foaming method for thermal insulation materials, in particular to a demolding and foaming method for polyurethane thermal insulation materials for outdoor milk storage and medium and large (above 20T) thermal insulation tanks. Background technique [0002] At present, the commonly used polyurethane foaming of thermal insulation tanks is to use the sleeved tank to open an operation port on the neck ring or the outer shell of the tank to inject polyurethane for foaming without viewing angle. Such polyurethane foaming will have the following problems: the situation after polyurethane foaming cannot be accurately determined, and it is extremely difficult to find the missing or missing parts, which seriously affects its insulation effect. Moreover, the foamed operation port is difficult to completely repair during welding. Even if it is polished, it will affect its aesthetics. The compression deformation caused by polyur...

AI Technical Summary

Problems solved by technology

In this way, polyurethane foaming will have the following problems: the situation after polyurethane foaming cannot be accurately determined, and it is extremely difficult to find places where it is missing or not, which seriously affects its thermal insulation effect

This method requires high requirements for assembly, otherwise there will be a large gap, which will seriously affect the heat preservation effect; and it is easy to damage the pull belt fixing the polyurethane module when the tank is set, causing the modules to scatter, which will further affect its heat preservation effect

[0004] To sum up, the disadvantages of the existing polyurethane foaming process for thermal insulation tanks are: the production process is relatively cumbersome, and it is difficult to achieve the ideal thermal insulation effect, and at the same time, the appearance of the tank body is not beautiful due to reasons such as the operation port.