A thin-walled tube lost foam coating and its preparation method and application

Abstract

The invention provides thin-wall pipe evanescent mode paint. The paint is matched with high-aluminum powder, sepiolite, sodium bentonite and aluminum dihydrogen phosphate for use. The thin-wall pipe evanescent mode paint is excellent in thixotropy and low in density and viscosity, can effectively realize the strength and thickness balance, and is high in stability, low in cost, high in paint surface smoothness and safe in use.

Description

technical field [0001] The invention belongs to the field of lost foam coating preparation, and in particular relates to a thin-walled tube lost foam coating and a preparation method and application thereof. Background technique [0002] The white mold of thin-walled pipe fittings has low strength and is easy to deform. It is easy to damage the model during the dipping and baking process. The density of the current white mold model is generally low density. By using a low-density white mold, it can reduce the amount of gas generation and reduce Cost and reduction of foam residue, etc. However, the white mold with low density will inevitably reduce its strength. In actual operation, it is often cracked or out of round at the pipe socket, etc.; on the other hand, the thickness of the coating is also expected to be thin, because the thin coating is breathable The ideal state of the coating is uniform. When the coating is thin and the number of dipping times is small, the coatin...

AI Technical Summary

Problems solved by technology

[0002] The white mold of thin-walled pipe fittings has low strength and is easy to deform. It is easy to damage the model during the dipping and baking process. The density of the current white mold model is generally low density. By using a low-density white mold, it can reduce the amount of gas generation and reduce Cost and reduction of foam residue, etc. However, the white mold with low density will inevitably reduce its strength. In actual operation, it is often cracked or out of round at the pipe socket, etc.; on the other hand, the thickness of the coating is also expected to be thin, because the thin coating is breathable The ideal state of the coating is uniform. When the coating is thin and the number of dipping times is small, the coating structure on the white mold can be guaranteed to be orderly and uniform, that is, the surface pores are evenly distributed, the coating thickness is the same, and the strength and air permeability of the coating will be relatively improved

But generally speaking, when the coating is thin, its strength will be reduced; and when the coating is thick, although it can increase the strength, it will greatly reduce other properties such as air permeability.

[0003] There are several kinds of coatings used by most enterprises: dry powder coatings, which are generally purchased. The main problem with this coating is that it is very harmful to human skin. During the specific use process, employees have skin problems; secondly, this coating The layer thickness must be controlled above 0.06mm to ensure the coating strength, resulting in too thick and uneven coating

[0004] Aluminum dihydrogen phosphate is a high-temperature binder, which has been used in the preparation of lost foam coatings, but it is prone to problems such as paint flow, poor thixotropy, and difficulty in coating.

[0005] In addition, the existing lost foam coatings still have problems such as poor stability and low coating finish.

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