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Cleaning of foundry molds

A technology of casting molds and adhesives, which is applied in the direction of manufacturing tools, casting molding equipment, cleaning/processing machinery of casting materials, etc.

Pending Publication Date: 2020-11-13
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method results in the generation of difficult-to-remove carbonaceous residues

Method used

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  • Cleaning of foundry molds
  • Cleaning of foundry molds
  • Cleaning of foundry molds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0390] 1. A method of disintegrating a foundry mold comprising sand and a polyurethane-based binder comprising the steps of:

[0391] (i) contacting the casting mold with a composition comprising:

[0392] (a) at least one carboxamide of the general formula (I):

[0393]

[0394] in

[0395] R 1 represents a linear or branched, unsubstituted or hydroxy-substituted C 2 -C 22 alkyl;

[0396] R 2 and R 3 independently of each other represent H or linear or branched, unsubstituted or substituted C 1 -C 12 alkyl; and

[0397] (b) at least one alkanolamine of the general formula (II):

[0398]

[0399] in

[0400] AO same or different and selected from CH 2 -CH 2 -O, CH(CH 3 )-CH 2 -O, CH 2 -CH(CH 3 )-O, CH(C 2 h 5 )-CH-O, C(CH 3 ) 2 -CH 2 -O, CHC (CH 3 ) 2 -O and CH 2 -CH(C 2 h 5 )-O,

[0401] m is 1, 2, 3, 4, 5, 6 or 7, and

[0402] x and y are independently 0 or 1;

[0403] A mixture of the sand and the polyurethane binder was obtained.

[040...

Embodiment

[0433] The following compounds were purchased from BASF SE, Ludwigshafen, Germany:

[0434] Monoethanolamine

[0435] AMD 3L (N,N-Dimethyllactamide)

[0436] FA12 (oleylamine ethoxylate)

[0437] XL60(C 10 Guerbet Alcohol Ethoxylate)

[0438] EL (castor oil ethoxylate)

[0439] AMD 10 (C 10 fatty acid N,N-dimethylamide)

[0440] AMD 810 (C 8 / C 10 fatty acid N,N-dimethylamide).

[0441] Foundry mold samples made of PU-sand composite material with dimensions 9 cm x 2.2 cm x 2.2 cm were prepared according to the prior art.

[0442] general program

[0443] Cast mold samples were dipped (1 / 3) into the compositions disclosed in Examples 1-6 at room temperature. The collapse time of the samples was determined. The collapse time is the time required for the cast mold sample to completely disintegrate into a mixture of sand and binder.

[0444]

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PUM

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Abstract

The present invention relates to a method of disintegrating a foundry mold comprising sand and a polyurethane binder. The present invention further relates to a method of disintegrating a foundry moldby contacting it with a composition comprising at least one carboxylic acid amide and at least one alkanolamine.

Description

[0001] field of invention [0002] The present invention relates to a method of disintegrating a foundry mold comprising sand and a polyurethane binder. The invention further relates to a method for disintegrating a casting mold by bringing it into contact with a composition comprising at least one carboxamide and at least one alkanolamine. [0003] Background of the invention [0004] All foundries produce castings by pouring molten metal into molds. The most common type of casting method is known as sand casting. Sand is used in two different ways in metal casting: as a molding material to form the external shape of a casting and as a sand core to form internal voids in a product such as an engine block. Since sand grains do not naturally stick to each other, binders must be introduced to allow the sand to stick together and maintain its shape during the process of introducing the molten metal into the mold and cooling the casting. [0005] Sand casting involves creating a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22B22C5/08B22D29/00B22D31/00C23G1/00
CPCB22C1/2273B22C5/08B22D29/00B22D29/002B22D31/002B22C1/2233
Inventor T·乌尔班H·乌尔查M·科赫T·帕舍
Owner BASF AG