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US 2021/0299740 A1Published application
Sizing composition for casting molds for metal casting, method for producing the casting molds, and casting molds provided with the sizing composition
AssigneeASK Chemicals GmbH
InventorsChristian PRIEBE, Markus BUNG, Sarah VOSS, Jörg KÖRSCHGEN
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Abstract
The subject matter of the invention are sizing compositions containing an aqueous carrier liquid, refractory base materials and CH-acidic compounds, as well as their use for casting molds, as well as casting molds coated with the sizing composition.
Claims23
A sizing composition comprising:
- (A) a CH-acidic compound that comprises at least one beta-dicarbonyl group,
- i) wherein the CH-acidic compound has the following formula:
- in which
- R1 is a C1 to C18 hydrocarbon, preferably a C1 to C12, and particularly preferably a C1 to C6 hydrocarbon, and
- R2 is H,
- a C1 to C18 hydrocarbon, preferably a C1 to C12 hydrocarbon, and particularly preferably a C1 to C6 hydrocarbon, wherein in R2 optionally 1 to 3 oxygen atoms may be contained in the hydrocarbon,
- and/or
- ii) wherein the CH-acidic compound has several beta-dicarbonyl groups of formula
- R1C(═O)—CH2—C(═O)—O— (I)
- in which R1 is a C1 to C12 hydrocarbon,
- and/or
- iii) wherein the CH-acidic compound is a malonic acid diester of alcohols with a C-chain of C1 to C18;
- (B) at least 20% by weight of a carrier liquid comprising or consisting of water;
- and
- (C) refractory base materials.
12 more elements
The method of claim 24, further comprising the steps of:
- applying the sizing composition to the casting mold or core;
- and
- exposing the sizing composition to a temperature of 100 to 200° C., in particular 120 to 180° C. to dry the sizing composition, in particular in a continuous furnace.
21-23. (canceled)
The method according to claim 23, wherein the step of curing is performed by a method selected from the group consisting of:
- PU cold-box, PU no-bake, Resol-CO2, Betaset and Epoxy-SO2 methods, in particular the PU cold-box, PU no-bake or Resol-CO2 method.
Dependencies are inferred from the claim text.