Anti-cracking casting coating based on attapulgite

A technology of attapulgite and foundry coating, applied in foundry molding equipment, coating, mold and other directions, can solve the problems of unsafe, flammable and explosive alcohol, not environmental protection, etc., achieve excellent bonding ability and improve suspension performance , the effect of improving the mechanical strength

Inactive Publication Date: 2018-09-18
ANHUI SOLID FOUNDRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, good dissolution of coating additives is achieved by adding alcohol as an auxiliary agent. However, the use of alcohol is not only easy to cause waste and increase costs, but also alcohol is flammable and explosive, making the production process neither safe n

Method used

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  • Anti-cracking casting coating based on attapulgite
  • Anti-cracking casting coating based on attapulgite

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] The preparation method of the modified attapulgite is as follows: after the attapulgite is ground and refined, a composite coupling agent is added, then stirred, heated to 70° C., and then kept for 2 to 3 hours, and then a dispersant is added, and the temperature is continued to be stirred and heated to 80° C. ℃, the material was discharged and dried to obtain modified attapulgite.

[0022] The foundry dust of the present invention mainly comes from two aspects, one is the flue gas dust discharged from the cupola smelting process, which includes three types of dusts: metallurgical dust, carbon dust and dust; the other is from the sand processing system , casting fallout and iron sand dust in the process of casting cleaning; due to the limitation of many factors, the efficient use of foundry dust has always been a common problem in the foundry field, such as improper handling, it is easy to lead to environmental pollution and waste of resources. In the present invention,...

Example Embodiment

[0032] Example 1

[0033] An anti-cracking casting coating based on attapulgite, the preparation raw materials of the coating include: 38kg of mullite powder, 18kg of foundry dust, 8kg of magnesium oxide, 5kg of sodium silicate, 4kg of sodium hydroxymethyl cellulose, 12kg of silica sol, Modified attapulgite 14kg;

[0034] The preparation method of the foundry coating is as follows:

[0035] Mullite powder, foundry dust, magnesium oxide, sodium silicate, sodium hydroxymethyl cellulose and modified attapulgite were added to a high-speed mixer and mixed evenly, then unloaded and transferred to a mixer, added with silica sol, ultrasonicated Disperse for 25 minutes, then spread the mixture into sheets, calcinate for 8 minutes at a high temperature of 880°C under the protection of inert gas, and finally grind the calcined residue and pass it through a 50-mesh sieve to obtain the casting coating.

Example Embodiment

[0036] Example 2

[0037] The formula composition of the anti-cracking casting coating in this example and Example 1 is basically the same, and the preparation method is the same. The difference is that in the preparation raw materials of the coating, the mullite powder is replaced with cordierite powder, and the rest remain unchanged.

[0038] Specifically, the raw materials for the preparation of the coating include: 38kg of cordierite powder, 18kg of foundry dust, 8kg of magnesium oxide, 5kg of sodium silicate, 4kg of sodium hydroxymethyl cellulose, 12kg of silica sol, and 14kg of modified attapulgite.

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Abstract

The invention belongs to the technical field of casting, and particularly relates to an anti-cracking casting coating based on attapulgite. The prepared raw materials of the coating comprise aggregates, magnesium oxide, sodium silicate, carboxymethyl cellulose sodium, silica sol and modified attapulgite; the preparation method of modified attapulgite comprises the following steps of grinding and refining the attapulgite, adding the composite coupling agent, stirring, heating to 70 DEG C and preserving heat for 2-3 hours, adding a dispersing agent, continuously stirring and heating to 80 DEG C,and discharging the materials and drying the materials to obtain the modified attapulgite. The aggregate is taken as a carrier, the magnesium oxide, the sodium silicate and the carboxymethyl cellulose sodium are mixed, the suspension performance of components in the coating can be improved by the magnesium oxide, and meanwhile, the magnesium oxide is excellent refractory materials; and the sodiumsilicate has excellent binding capacity, and meanwhile, the effect of increasing the stability is achieved in the coating; and the added modified attapulgite is used as a reinforcing agent, so that the mechanical strength of the coating is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a crack-resistant casting coating based on attapulgite. Background technique [0002] Foundry coating is a casting auxiliary material that covers the surface of the mold and core during the casting process to improve its surface refractoriness, chemical stability, resistance to molten metal erosion, and sand sticking resistance. Alcohol-based casting coatings, as a quick-drying coating, have been widely used in the foundry field. In order to obtain better alcohol-based casting coatings, various coating additives need to be added, and the good miscibility of coating additives and alcohol-based coatings determines the suspension stability of casting coatings, as well as the anti-peeling and peeling properties of casting coatings after brushing. High temperature crack resistance, etc. In the prior art, good dissolution of coating additives is achieved by adding alcohol...

Claims

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Application Information

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IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 何祥炎孙国政周万波
Owner ANHUI SOLID FOUNDRY CO LTD
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