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Anti-stick coating for surfaces

a technology of anti-stick coating and surface, which is applied in the field of composition, can solve the problems of preventing the formation of thin, continuous film, and often not coating the surface well, and achieves the effect of facilitating surface cleaning and facilitating pattern separation and core box

Inactive Publication Date: 2006-04-13
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] This invention is directed to a release agent composition that facilitates separation of patterns and core boxes from foundry molds and cores, and castings from molds and workpieces from dies, tools, and machinery components. The release agent also protects surfaces by preventing foreign matter from sticking to surfaces. This invention is also directed to a release agent composition that facilitates cleaning of surfaces, such as concrete, tile, and wood. The release agent comprises (a) a crosslinkable fluorotelomer comprising repeat units derived from a fluoroalkene; (b) a moisture-curable silicone; (c) a catalyst; and (d) a solvent.

Problems solved by technology

Silicones often do not, however, coat surfaces well when dispersed in a typical hydrocarbon solvent.
The silicone resins are prone to bead or puddle on the surface to which they have been applied, thus preventing a thin, continuous film from being achieved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0058] A commercially available packaging tape was coated with the Example Composition described in Table 1 and its releasability from various surfaces was qualitatively compared with a 350 Centistoke silicone oil, available from Dow Coming, and a PTFE composition, DryFilm RA\IPA\5% (available from by E. I. du Pont de Nemours and Company, Wilmington, Del.). The silicone oil and PTFE composition are both commonly used release agents.

TABLE 1Example CompositionAmount,ComponentSupplierlbSitres ® MSE 100 siliconeWacker Silicones, Adrian, MI0.700resinDow Corning ® Z-6018Dow Corning, Midland, MI0.150silicone intermediateDow Corning 9770 reactiveDow Corning, Midland, MI0.159silicone oilMethyl Ethyl KetoneExxonMobil Chemicals,1.000Houston, TXCross-linkableE. I. du Pont de Nemours and0.740polytetrafluoroethylene, 25%Company, Wilmington, DEin isopropanolTetrabutyl titanateE. I. du Pont de Nemours and0.100Company, Wilmington, DETM3-65A solvent blendChemical Solvents, Inc.,4.106Cleveland, OH

[0...

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Abstract

A release agent composition to prevent sticking and facilitate separation of surfaces, such as patterns and core boxes from foundry molds and core s comprises (a) a cross-linkable fluorotelomer comprising repeat units derived from a fluoroalkene; (b) a moisture-curable silicone; (c) a catalyst; and (d) a solvent. Further is provided a method to improve the release properties of molds removed from a pattern or core box comprising applying the release agent composition to the pattern or core box surface.

Description

CROSS REFERENCE(S) TO RELATED APPLICATION(S) [0001] This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 60 / 618,519 (filed Oct. 13, 2004) which is incorporated by reference herein for all purposes as if fully set forth.FIELD OF THE INVENTION [0002] This invention relates to a composition that can be used to coat a substrate surface thereby improving the surface function. In particular, the composition can be used as a release agent for facilitating release of a mold from a pattern or core box. The composition can be applied generally to substrate surfaces to prevent sticking. BACKGROUND OF THE INVENTION [0003] Many industrial operations require the use of release agents to reduce the tendency of sticking, such as of a molded product to stick to a mold, or that of a tool, die, or machine part to stick to the workpiece. [0004] In foundry operations, metal parts are frequently made using “sand casting” methods wherein disposable foundry shape...

Claims

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Application Information

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IPC IPC(8): B22C1/22
CPCB22C3/00B29C33/62B29C33/64B29C67/24B29K2027/18B29K2083/00B29K2105/0088C08L27/18C08L83/04C08L2666/14C09D127/18
Inventor GOPALRATNAM, USHA SRINIVASANGULLO, MARK JOSEPHTESTA, LEONARD GEORGE
Owner EI DU PONT DE NEMOURS & CO