Use of amine blends for foundry shaped cores and casting metals

Patent metadata

Field	Value
Publication number	US-10828696-B2
Application number	US-201815991707-A
Country	US
Kind code	B2
Filing date	May 29, 2018
Priority date	Jan 22, 2007
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

Provided is a catalyst suitable for curing a composite resin composition that includes comprising a blend of at least two tertiary amines selected from dimethylethylamine (DMEA), diethylmethylamine (DEMA), dimethylisopropylamine (DMIPA), and dimethyl-n-propylamine (DMPA), where each of the at least two tertiary amines is present in the blend in an amount of not less than 10% by weight and not more than 90% by weight.

First claim

The invention claimed is:

1. A catalyst suitable for curing a composite resin composition, comprising:
(a) 10% to 50% by weight of dimethylethylamine (DMEA), and
(b) 50% to 90% by weight, in total, of at least one amine selected from the group consisting of diethylmethylamine (DEMA), dimethylisopropylamine (DMIPA), and dimethyl-n-propylamine (DMPA),
wherein the sum of (a) and (b) totals 100% by weight.

2. The catalyst of claim 1 , which comprises diethylmethylamine (DEMA).

3. The catalyst of claim 1 , which comprises dimethylisopropylamine (DMIPA).

4. The catalyst of claim 1 , which comprises dimethyl-n-propylamine (DMPA).

5. The catalyst of claim 1 , wherein (b) comprises at least two of diethylmethylamine (DEMA), dimethylisopropylamine (DMIPA), and dimethyl-n-propylamine (DMPA).

6. The catalyst of claim 1 , wherein the blend of at least two amines is chosen from 50/50 DMEA/DMIPA, 20/80 DMEA/DMIPA, 10/90 DMEA/DMIPA, 50/50 DMEA/DMPA, 20/80 DMEA/DMPA, 10/90 DMEA/DMPA, 50/50 DMEA/DEMA, 20/80 DMEA/DEMA, or 10/90 DMEA/DEMA, by weight.

7. The catalyst of claim 1 , wherein the catalyst consists of DMEA and DEMA.

8. A composition, comprising the catalyst of claim 1 , a binder, and an aggregate.

9. A process of preparing the catalyst of claim 1 , comprising combining the amines.

10. A process for preparing a foundry shape by a cold box process, comprising:
(a) forming a foundry mix comprising a binder and an aggregate,
(b) forming a foundry shape by introducing the foundry mix obtained from (a) into a pattern,
(c) contacting the foundry shape with the catalyst of claim 1 , in a liquid or a gaseous form, optionally with an inert carrier,
(d) hardening the foundry shape into a hard, solid, cured shape, and
(e) removing the hardened foundry shape of (d) from the pattern.

11. The process of claim 10 , wherein the inert carrier is gaseous and chosen from nitrogen, air, carbon dioxide or mixtures thereof.

12. The process of claim 10 , wherein the catalyst is chosen from 50/50 DMEA/DMIPA, 20/80 DMEA/DMIPA, 10/90 DMEA/DM 1 PA, 50/50 DMEA/DMPA, 20/80 DMEA/DMPA, 10/90 DMEA/DMPA, 50/50 DMEA/DEMA, 20/80 DMEA/DEMA, or 10/90 DMEA/DEMA, by weight.

13. The process of claim 10 , further comprising the step of hardening the hardened foundry shape obtained from (e).

14. The process of claim 10 , further comprising:
(f) pouring metal in the liquid state around said hardened foundry shape;
(g) allowing the metal to cool and solidify forming a mounded article; and
(h) separating the molded article and the hardened foundry shape.

15. In a process for preparing a hardened foundry shape by a cold box process, the improvement comprising contacting a foundry shape containing a foundry mix comprising a binder and an aggregate with the catalyst according to claim 1 .

16. A catalyst suitable for curing a composite resin composition, comprising a blend of at least two tertiary amines selected from the group consisting of 50/50 dimethylethylamine (DMEA)/diethylmethylamine (DEMA), 20/80 DMEA/DEMA, and 10/90 DMEA/DEMA, by weight.

17. The catalyst of claim 16 , wherein the blend of at least two tertiary amines is 50/50 DMEA/DEMA, by weight.

18. The catalyst of claim 16 , wherein the blend of at least two tertiary amines is 20/80 DMEA/DEMA, by weight.

19. The catalyst of claim 16 , wherein the blend of at least two tertiary amines is 10/90 DMEA/DEMA, by weight.

20. A composition, comprising the catalyst of claim 16 , a binder, and an aggregate.

21. A process of preparing the catalyst of claim 16 , comprising combining the DMEA and DEMA.

22. A process for preparing a foundry shape by a cold box process, comprising:
(a) forming a foundry mix comprising a binder and an aggregate,
(b) forming a foundry shape by introducing the foundry mix obtained from (a) into a pattern,
(c) contacting the foundry shape with the catalyst of claim 16 , in a liquid or a gaseous form, optionally with an inert carrier,
(d) hardening the foundry shape into a hard, solid, cured shape, and
(e) removing the hardened foundry shape of (d) from the pattern.

Assignees

• Arkema France

Inventors

• Van Hemelryck Bruno
• Vacelet Pierre-Henri
• Roze Jean-Claude
• Muller Jens
• Koch Diether

Classifications

• B22C1/16

  characterised by the use of binding agents; Mixtures of binding agents · CPC title

• B22C9/10

  Cores; Manufacture or installation of cores {(breaker cores B22C9/084)} · CPC title

• C08G59/50 Primary

  Amines · CPC title

• B22D29/00

  Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots {(B22D13/10, B22D11/124, B22D17/00 take precedence)} · CPC title

• B22C1/20

  of organic agents · CPC title