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Coating for water-based magnesia casting and preparation method thereof

A magnesia and coating technology, which is applied in casting molding equipment, coatings, casting molds, etc., can solve problems affecting the surface quality of castings, serious coating brush marks, sedimentation and agglomeration, etc., and achieves no agglomeration and suspension rate High, good brushing effect

Inactive Publication Date: 2013-02-27
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the special sand has the advantages of high refractoriness, good thermal stability, good chemical inertness, no chemical reaction with molten steel, strong chilling ability, etc., but it also has the defects of high cost and inconvenient use; water-based casting Due to the characteristics of high production efficiency, low price and wide application range, coatings have been widely used in foundry production in my country. However, water-based magnesia sand casting coatings are prone to chemical reactions and precipitation during long-term storage and transportation. and agglomeration, and the coating brush marks are serious, which will affect the surface quality of the casting

Method used

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Effect test

preparation example Construction

[0041] The preparation method of water-based magnesia casting coating of the present invention, concretely implement according to the following steps:

[0042] Step 1, take by weighing the raw material that prepares water-based magnesia foundry coating:

[0043] Weigh 60%~75% of refractory powder, 1%~8% of binder, 1%~6% of suspending agent, 20%~30% of carrier liquid, 0.05%~0.2% of surfactant, and above The sum of the contents of the components is 100%;

[0044] Step 2, prepare water-based magnesia casting coating:

[0045] Add the refractory powder and binder weighed in step 1 to the wheel mill for rolling, then add the suspending agent, carrier liquid, surfactant and water-soluble resin to the wheel mill for rolling, and finally put the wheel The coating in is taken out after the colloid mill, promptly obtains the water-based magnesia casting coating of the present invention:

[0046] 1) Mix the refractory powder and suspending agent weighed in step 1 and pour them into th...

Embodiment 1

[0054]Take by mass percentage respectively magnesia powder 60%, silica sol 4.95%, bentonite 5%, ethanol 30%, surfactant 0.05%, the content sum of above components is 100%;

[0055] First pour the weighed magnesia powder and bentonite into the wheel mill and roll for 3 minutes, then add silica sol to the wheel mill and roll for 3 minutes, then add surfactant to the wheel mill and roll for 3 minutes, and finally add The carrier liquid is rolled again for 3 minutes to obtain the paint powder; the obtained paint powder is rolled again for 30 minutes, then passed through a colloid mill, and finally discharged to obtain the water-based magnesia casting paint of the present invention.

Embodiment 2

[0057] Take by weight 70% of magnesia powder, 3% of silica sol, 4.9% of bentonite, 22% of ethanol, 0.1% of surfactant, and the total content of the above components is 100% by mass percentage;

[0058] Pour the weighed magnesia powder and bentonite together into a wheel mill and roll for 9 minutes, then add a binder to the wheel mill and roll for 9 minutes, then add a surfactant to the wheel mill for 9 minutes, and finally The coating powder is obtained by adding the carrier liquid and rolling for 9 minutes again; the obtained coating powder is rolled again for 60 minutes, then passed through a colloid mill, and finally discharged to obtain the water-based magnesia casting coating of the present invention.

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Abstract

The invention discloses a coating for water-based magnesia casting and a preparation method thereof. The coating comprises effective components of, by mass, 60%-75% of fire-resistant powder materials, 1%-8% of binders, 1%-6% of suspending agents, 20%-30% of carrier liquid and 0.05%-0.2% of surfactants, and ccccccccccccsthe total content of the components is 100%. The method includes feeding weighed fire-resistant powder materials and the binders into an edge runner mill for grinding, then feeding the suspending agents, the carrier liquid and the surfactants into the edge runner mill sequentially for grinding, and finally taking out the coating from the edge runner mill after passing through a colloid mill so as to obtain the coating for the water-based magnesia casting. According to the coating and the method, magnesia and the like are taken as the fire-resistant materials, alcohol is taken as a solvent, and the coating is prepared into a powder or paste shape. The coating is high in suspensibility, good in painting, high in surface finishment, not easy to precipitate or caking and good in liquidity and stability.

Description

technical field [0001] The invention belongs to the technical field of casting coatings, in particular to a water-based magnesia casting coating, and also relates to a preparation method of the water-based magnesia casting coating. Background technique [0002] Coatings for sand casting are receiving more and more attention from foundry workers. There are many kinds of coatings used, which are usually brushed on the surface of the mold to improve the surface finish of the casting and reduce casting defects such as sand sticking and sand inclusions. Adding refractory materials with high melting point to the coating can isolate and reduce the thermal, mechanical and chemical effects of molten metal on molding sand and core sand, and castings with smooth surfaces can be obtained. [0003] At present, at home and abroad, there are mainly two methods to prevent sand sticking of manganese steel castings and other high-alloy steel castings: using special sand as surface sand and br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 屈银虎刘新峰王凤梁涛
Owner XI'AN POLYTECHNIC UNIVERSITY
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