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A kind of production method of water-based flow-coating coating that prevents veining defects

A production method and defect technology are applied in the production field of water-based flow coating to achieve the effects of uniform coating, good heat insulation and strong adhesion

Active Publication Date: 2017-09-22
共享新材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a unique method that can prevent veins, sticky sand, sand inclusions, improve the surface finish of castings, and the dimensional accuracy of castings, and has superior fluidity and good leveling. , good stability, no pollution, easy storage, a production method of water-based flow coating to prevent veining defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: The above coating is composed of the following components in parts by weight: zircon powder 5%, mullite 20%, flake graphite 5%, spodumene 3%, kyanite 3%, iron oxide red 20% , Composite suspending agent 2%, polyvinyl alcohol 0.5%, silica sol 0.2%, surfactant 0.05%, lignosulfonate 0.05%, defoamer 0.2%, sodium carboxymethylcellulose 0.5%, hollow microspheres 0.5%, water 40%.

Embodiment 2

[0030] Embodiment 2: The above coating is composed of the following components in parts by weight: 10% zircon powder, 15% mullite, 5% flake graphite, 5% spodumene, 5% kyanite, and 3% sepiolite , iron oxide red 15%, composite suspending agent 2.5%, polyvinyl alcohol 0.5%, silica sol 0.2%, surfactant 0.05%, lignosulfonate 0.05%, defoamer 0.2%, sodium carboxymethylcellulose 0.5%, hollow microspheres 1.0%, water 37%.

Embodiment 3

[0031] Embodiment 3: The above coating is composed of the following components in parts by weight: 15% zircon powder, 15% mullite, 5% flake graphite, 3% spodumene, 5% kyanite, and 15% iron oxide red , Composite suspending agent 3.0%, polyvinyl alcohol 0.5%, silica sol 0.4%, surfactant 0.05%, lignosulfonate 0.05%, defoamer 0.2%, sodium carboxymethylcellulose 0.3%, hollow microspheres 1.5%, water 36%.

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PUM

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Abstract

The present invention relates to a kind of production method of water-based flow-coating paint, especially relate to a kind of production method of water-based flow-coating paint that prevents veining defects, the method is bentonite and silicate quality pretreatment; PVA pretreatment; Add appropriate amount of water and treated bentonite slurry to the dispersion kettle, start stirring, then add defoamer, surfactant, thickener, binder, etc.; finally add the pretreated PVA solution, stir for several minutes; stir Adjust the speed to 500 r / min, add zircon powder, mullite, flake graphite, spodumene, kyanite, sepiolite, red iron oxide, and hollow microspheres to the dispersion kettle in sequence, and then add water reducing agent; After feeding, adjust the rotating speed to 1200 r / min, and disperse for 20 minutes; adjust the Baumé degree with water to an appropriate range; the method of the invention is unique, can prevent veins, sticky sand, sand inclusions, and improve the surface finish of castings and the dimensional accuracy of castings , and has excellent fluidity, good leveling, good stability, no pollution, and easy storage.

Description

technical field [0001] The invention relates to a production method of water-based flow coating, in particular to a production method of water-based flow coating for preventing vein defect. Background technique [0002] Veining defects are typical casting defects in the production of engine castings, and the cold box sand core has the greatest tendency to produce veining. Engine castings often have veining defects in water jackets, oil passages, and air passages. Such defects will hinder the gas-liquid vortex characteristics of the engine cavity, thereby affecting the working performance of the engine. Therefore, solving veining defects is very important for automotive castings such as cylinder blocks and cylinder heads. [0003] A large number of studies and long-term casting practice have shown that the root cause of veining defects on the casting surface is the cracking of the sand mold caused by the phase transformation and expansion of silica sand at 573 °C. At a temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
Inventor 李天才
Owner 共享新材料(山东)有限公司
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