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Water-based air-dried polyvinyl alcohol coating for casting

A polyvinyl alcohol water-based, self-drying coating technology, used in casting molding equipment, coatings, molds, etc., can solve the problems of easy precipitation, easy moisture absorption, easy cracking, etc., and achieve high surface strength, not easy to precipitate, Not easy to absorb moisture

Inactive Publication Date: 2015-04-29
QINGDAO WUYANG CASTING MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, syrup, carboxymethyl cellulose and bentonite are commonly used as binders for steel casting water-based coatings, and bentonite is used as a suspending agent. The coating needs to be baked, and it is easy to precipitate. The sediment is dense, the surface strength of the coating is low, and it is easy to dry after drying. Cracks, easy to absorb moisture, the core absorbs a lot of water when dipped, and often collapses

Method used

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Examples

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Embodiment

[0013] The polyvinyl alcohol water-based self-drying coating for casting in this embodiment has composition (weight%): graphite powder 72-81.1%; talc powder 5-10%; activated bentonite 1.5-2.5%; polyvinyl alcohol 17-88 8-10% (made into 4-5% aqueous solution); 950-1100 0 C Roasted magnesia powder 4-5%; carboxymethyl cellulose 0.4-0.5% (made into an aqueous solution with a concentration of 5-6%); water 300-400%.

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PUM

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Abstract

The invention discloses a water-based air-dried polyvinyl alcohol coating for casting. The coating is characterized in that a binder adopts a polyvinyl alcohol 17-88 aqueous solution, a suspending agent adopts calcined magnesium oxide powder, activated magnesium powder, activated bentonite and a carboxymethyl cellulose aqueous solution, and the water-based air-dried coating which is air-dried without baking, high in coating surface strength and free of cracks and does not settle and absorb moisture easily is prepared from various refractory aggregate and is applicable to alloy castings, carbon steel castings, iron castings and non-ferrous alloy castings.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a polyvinyl alcohol water-based self-drying coating for casting. [0003] Background technique [0004] At present, syrup, carboxymethyl cellulose and bentonite are commonly used as binders for steel casting water-based coatings, and bentonite is used as a suspending agent. The coating needs to be baked, and it is easy to precipitate. The sediment is dense, the surface strength of the coating is low, and it is easy to dry after drying. Cracks, easy to absorb moisture, dip-coated core absorbs a lot of water, and often collapses. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the object of the present invention is to provide a polyvinyl alcohol water-based self-drying coating for casting, which saves energy, is not easy to precipitate, and the refractory aggregate is f...

Claims

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Application Information

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IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 于永健
Owner QINGDAO WUYANG CASTING MACHINE
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