Box-type polyurethane foam preparation method

Abstract

The invention relates to a box-type polyurethane foam preparation method, which can ensure that the foaming liquid is always in the state of constant temperature, constant pressure and constant humidity during the foaming process, ensures the quality of the foamed product, and can obtain a foam with the upper surface flush. Foam, foam with uniform density can be obtained.

Description

technical field [0001] The invention relates to a method for preparing box-type polyurethane foam, which belongs to the technical field of box-type foaming. Background technique [0002] The existing patent discloses a utility model patent for a low-VOC box foam device (publication number: 207808245 U), which provides foaming by reducing the air pressure, and finally can obtain a bread-shaped foam, which is mainly achieved by reducing the air pressure. In this way, the foaming ratio can be increased, and the use of foaming liquid can be reduced. [0003] In the process of application, the inventor found the following problems: [0004] 1. The foam is in the shape of bread, and the middle part of the foam is raised, so that the foam in the raised part needs to be cut off during use, and then discarded, resulting in a lot of waste; [0005] 2. When the foam is used for slicing, the weight of the slices on the lower side tends to be higher, which makes the overall quality inc...

AI Technical Summary

Problems solved by technology

[0004] 1. The foam is in the shape of bread, and the middle part of the foam is raised, so that the foam in the raised part needs to be cut off during use, and then discarded, resulting in a lot of waste;

[0005] 2. When the foam is used for slicing, the weight of the slices on the lower side tends to be higher, which makes the overall quality inconsistent

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