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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 nor environmentally friendly; There are also companies that make paint into paste. Although the amount of alcohol is reduced to a certain extent, the product still contains a lot of alcohol, and the production safety problems of paint companies have not been effectively solved.

Method used

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

Examples

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preparation example Construction

[0021] The preparation method of the modified attapulgite is as follows: grind and refine the attapulgite and add a composite coupling agent, then stir, heat up to 70°C and keep it warm for 2-3 hours, then add a dispersant, continue to stir and heat up to 80°C °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 during the cupola smelting process, which includes metallurgical dust, carbon dust and dust; the other is from the sand treatment system , Casting shakeout and iron sand dust in the process of casting cleaning; Due to the limitations of many factors, the efficient use of foundry dust has always been a common problem in the foundry field. If it is not handled properly, it will easily lead to environmental pollution and waste of resources. The present invention uses it as the raw material for the preparation of the paint, utilizes the...

Embodiment 1

[0033] A crack-resistant casting coating based on attapulgite, the preparation raw materials of the coating include: 38kg of mullite powder, 18kg of casting dust, 8kg of magnesium oxide, 5kg of sodium silicate, 4kg of sodium hydroxymethylcellulose, 12kg of silica sol, Modified attapulgite 14kg;

[0034] The preparation method of this foundry coating is:

[0035] Add mullite powder, foundry dust, magnesium oxide, sodium silicate, sodium hydroxymethyl cellulose and modified attapulgite into a high-speed mixer and mix evenly, then unload and transfer to the mixer, add silica sol, and ultrasonically Disperse for 25 minutes, then spread the mixture into sheets, and under the protection of an inert gas, calcinate at a high temperature of 880°C for 8 minutes, and finally grind the calcined residue and pass through a 50-mesh sieve to obtain the casting coating.

Embodiment 2

[0037] The composition of the anti-crack 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, mullite powder is replaced by cordierite powder, and the rest remain unchanged.

[0038] Specifically, the raw materials for the preparation of the paint include: 38kg of cordierite powder, 18kg of foundry dust, 8kg of magnesium oxide, 5kg of sodium silicate, 4kg of sodium hydroxymethylcellulose, 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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