A kind of multifunctional coating for casting and preparation method thereof

Abstract

The invention provides a multifunctional coating for casting and a preparation method thereof and particularly relates to the technical field of casting coatings. The method comprises the steps that firstly, a polystyrene fused solution is adopted for firing a compound, quartz sand powder and bentonite wrap the compound in batch in sequence, a wrapping compound is prepared, then powder of plasterof paris, sweet wormwood herb wax, trehalose and zinc oxide crystal whiskers are added to the wrapping compound, and the multifunctional coating for casting is prepared. The coating can be simultaneously used for two processes of lost foam casting and V-method casting, after coating is completed, cracks, bubbles and wrinkles do not exist, and the multifunctional coating for casting has the advantages of being resistant to wear, high in drying speed, adhesive force and air permeability and the like. The sand burning, shrinkage porosity and pore defects of a casting can also effectively prevented. The other aim of the invention is to provide the preparation method of the multifunctional coating for casting. The method is easy to operate, stable in process and suitable for large-scale production, and parameters can be controlled.

Description

【Technical field】 [0001] The invention relates to the technical field of casting coatings, in particular to a multifunctional coating for casting and a preparation method thereof. 【Background technique】 [0002] Foundry coating is one of the most important casting raw and auxiliary materials, which plays a key role in ensuring the surface quality of castings. With the continuous innovation and development of the foundry industry, new technologies such as lost foam casting and V method casting, which are different from traditional sand casting, have emerged. In terms of the nature of the coating, these two new processes are different from sand casting. Sand casting is to attach the coating to the sand mold and sand core. It is required that the coating should not have too much air permeability to prevent the core The generated gas enters the molten iron and affects the product quality; while the new technology is to attach the paint to the plastic model or plastic film, whic...

AI Technical Summary

Problems solved by technology

In fact, these two processes have basically the same requirements for coating properties, that is, high wear resistance, quick drying, high air permeability and high adhesion, which are also the most easily overlooked points in the coating research process, so until now There are few researches on coatings that can be used for both processes at the same time, which has become a current difficulty and a hot spot in the future

The Chinese patent authorization announcement number is CN102836950B, a patent document named a lost foam coating and its preparation method, which discloses a method of using high alumina bauxite clinker, quartz powder, flaky graphite, sodium bentonite, etc. as raw materials to prepare lost foam coatings. The method of mold coating solves the problem of coating air permeability and adhesion to a certain extent, but it can only be used in the lost foam process, and the use is inevitably single

Chinese patent authorization announcement number is CN102527928B, the patent literature that is called as a kind of alcohol-based coating for V-method casting and its preparation method. Can be used for V method casting

Although the Chinese Patent Publication No. CN105499481A, the patent document titled Novel Porcelain Coating for Casting Technology, mentions that the prepared magnetized coating can be used for the above two new types of technology, but for the two types of lost foam casting and V method casting There are still big differences in the raw material composition and ratio of the coatings used in the process, and it is not true that one coating is used in two processes, and there is no in-depth exploration of the drying characteristics, adhesion, wear resistance, and air permeability of the coatings. Unsatisfactory in practice

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