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Coating compositions for inorganic casting molds and cores, comprising formic acid esters, and use thereof

A molding material and rubber technology, applied in the direction of coating, core, casting mold, etc., can solve problems such as low stability

Inactive Publication Date: 2014-06-11
ASK CHEM LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, inorganic binders also have the disadvantage compared to organic binders, for example known inorganic binders have a low stability of the casting molds produced with them against high air humidity or against water

Method used

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  • Coating compositions for inorganic casting molds and cores, comprising formic acid esters, and use thereof
  • Coating compositions for inorganic casting molds and cores, comprising formic acid esters, and use thereof
  • Coating compositions for inorganic casting molds and cores, comprising formic acid esters, and use thereof

Examples

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Embodiment Construction

[0066] In this example, the effect of salt in the size on the strength of the sized core was examined. The core compounds 1 to 3 used had the compositions indicated in Tables 1 to 3 .

[0067] Table 1: Composition of rubber compounds

[0068]

[0069]

[0070] Die-casting compounds were produced by supplying water and crushing the clay therein for at least 15 minutes followed by applying a high-shear mixer. The refractory components, pigments and dyes are then stirred in for at least 15 minutes until a homogeneous mixture is produced. Two additives, methyl formate or ethyl formate, were added to sizes 1 and 2 together with the described refractories. Additives such as wetting agents, defoamers and preservatives as well as adhesives are finally stirred in.

[0071] For the tests described below, the size was adjusted to a viscosity suitable for the application in the range of 0.6 Pas. The adjustment takes place by adding a corresponding amount of water to the original...

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Abstract

The subject matter of the invention relates to coating compositions comprising formic acid esters, an aqueous carrier liquid and pulverulent refractory material, and to the use thereof for casting molds, in particular those produced using water glass as a binder.

Description

technical field [0001] The invention relates to a size composition comprising methyl formate as a coating compound for casting moulds. The size composition is suitable for cores and molds, in particular such cores and molds are manufactured using water glass as binder. Background technique [0002] The casting mold can be obtained from a refractory material, for example quartz sand, when shaped into the casting mold and solidified by a suitable binder in order to ensure sufficient mechanical strength of the casting mold. For the production of casting molds, therefore, refractory mold base materials and suitable adhesives are used. The refractory base metal is preferably present in a flowable manner, so that it can be filled into a suitable cavity and compressed there. The binder creates a firm bond between the particles of the mold base material, so that the mold acquires the required mechanical stability. [0003] Both organic and inorganic binders can be used for the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/12B22C9/18
CPCB22C9/12B22C3/00B22C1/188B22C1/04
Inventor 迈克尔·克洛斯科夫斯基彼得·瓦赫塔尔奇克卡罗琳·瓦伦霍斯特
Owner ASK CHEM LP
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