Preparation method of water-based lost foam casting coating

A lost foam casting and coating technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve problems such as pores and other defects, poor mechanical properties, and limit the development and application range of lost foam aluminum alloy casting technology. Improve the yield, easy to operate, and prevent the collapse of the box

Inactive Publication Date: 2020-02-21
HEXIAN KEJIA VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lost foam aluminum alloy castings are often due to serious defects such as pores and pores and poor mec

Method used

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  • Preparation method of water-based lost foam casting coating

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Embodiment 1

[0018] A method for preparing a water-based lost foam casting coating, comprising the following steps: (1) First, 23 parts of alcohol with a mass fraction of 95%, 8 parts of distilled water, 5 parts of acetic acid with a mass fraction of 3%, and 13 parts of hydrochloric acid with a mass fraction of 5% Add to the hydrolyzer in turn, stir for 5 minutes to make it evenly mixed; Add 13 parts of titanium tetrachloride to the hydrolyzer at one time, continue to stir for 1 hour to make it fully hydrolyzed, during the hydrolysis process, the temperature is controlled at 50 ° C, cooled , when the temperature drops below 30°C, filter it with gauze, cover and seal it to obtain a titanium tetrachloride hydrolyzate; (2) Soak 19 parts of diatomaceous earth in 6% acetic acid for 10 minutes, wash with deionized water, and then use Soak in 5% edible alkaline water solution for 30min, then wash with deionized water until neutral, then calcined at 650°C for 3 hours, add 0.5 part of oleic acid ami...

Embodiment 2

[0025] A method for preparing a water-based lost foam casting coating, comprising the following steps: (1) First, 23 parts of alcohol with a mass fraction of 95%, 8 parts of distilled water, 2 parts of acetic acid with a mass fraction of 3%, and 13 parts of hydrochloric acid with a mass fraction of 5% Add to the hydrolyzer one by one, stir for 10 minutes to make it evenly mixed; Add 13 parts of titanium tetrachloride to the hydrolyzer at one time, continue to stir for 1.5 hours to make it fully hydrolyzed, during the hydrolysis process, the temperature is controlled at 50 ° C, cooled , when the temperature drops below 30°C, filter it with gauze, cover and seal it to obtain a titanium tetrachloride hydrolyzate; (2) Soak 19 parts of diatomaceous earth in 6% acetic acid for 20 minutes, wash with deionized water, and then use Soak in 5% edible alkaline water for 30 minutes, then wash with deionized water until neutral, then calcined at 650°C for 3 hours, add 0.7 part of oleic acid ...

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Abstract

The invention discloses a preparation method of a water-based lost foam casting coating. According to the preparation method of the water-based lost foam casting coating, a coating layer and a castingare easy to strip, sand sticking is avoided, sand is easy to remove, the cleaning workload of the casting can be reduced, the water-based lost foam casting coating has the characteristics of good room-temperature and high-temperature comprehensive performance, high temperature resistance, scouring resistance, no cracking, low gas evolution, high coating strength, good air permeability and the like, and has good suspension property, coating property, thixotropy and leveling property, titanium tetrachloride is adopted for hydrolysis bonding, and bad defects can be avoided, so that the surface smoothness of the casting is good, and the process requirements of casting manufacturers are met.

Description

technical field [0001] The invention belongs to the technical field of casting coatings, and in particular relates to a preparation method of water-based lost foam casting coatings. Background technique [0002] At present, the application of lost foam casting is becoming more and more extensive. Coating quality is one of the elements of the lost foam casting process [0003] The purpose is to improve the rigidity of the foam module; to make the gasification products of the module escape quickly; to isolate the molten metal from the dry sand, so as to obtain castings with smooth surfaces. The lost foam casting technology in developed countries is quite mature, and foundry manufacturers generally use commercial coatings. . Domestic research on lost foam coatings started relatively late. Compared with foreign countries, there is still a certain gap in the quality of this kind of coatings, and imported coatings are expensive. The lost foam coating is used in the aluminum all...

Claims

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Application Information

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IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 黎宏
Owner HEXIAN KEJIA VALVE CASTING
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