Unlock instant, AI-driven research and patent intelligence for your innovation.

Foundry sandcore mold release composition

Inactive Publication Date: 2006-04-13
EI DU PONT DE NEMOURS & CO
View PDF15 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] This invention is directed to industrial lubricant and mold release agent compositions that facilitates separation of patterns and core boxes from foundry molds and cores, and castings from molds, and work pieces from dies, tools and machinery components.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Foundry sandcore mold release composition
  • Foundry sandcore mold release composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056] A release agent was prepared from 0.740 lb of a cross-linkable polytetrafluoroethylene, 25% by weight in isopropanol, 0.167 lb of a silicone intermediate oil having hydroxyl functionality, silicone intermediate available from Dow Corning, Midland, Mich., 0.007 lb of tetraisopropyl titanate catalyst, available from E. I. du Pont de Nemours and Company; 0.100 lb of Dow Coming 200® Fluid, 0.65 CST, available from Dow Coming; 0.12 lb of reactive silicone oil, available from Dow Corning; 0.054 lb of Dow Coming 57 Additive, available from Dow Coming; a solvent mixture comprising 3.442 lb of a solvent blend TM3-65A, available from Chemical Solvents, Inc., Cleveland, OH, and 2.848 lb of dipropylene glycol monomethyl ether, available from Dow Chemical Company, Midland, Mich.

[0057] The release agent was prepared by dissolving the Dow Coming silicone intermediate and the reactive silicone oil in Dowanol DPM. The cross-linkable polytetrafluoroethylene and Dow Corning 200® Fluid were add...

example 3

[0063] A hydroxy-terminated polyalkylsiloxane moid release agent was compared to PTFE containing film coatings according to the following protocol:

[0064] Protocol: Proceeded to test a HTDS coating for abrasion resistance to bead blasting in a controlled environment. This formulation was compared to a formulation containing a PTFE based Dry Film to compare resistance to abrasion from bead blasting.

[0065] Product Application: Formulations were applied at room temperature to a small steel coupon made by Q-panel by spraying with an aerosol sprayer applying a uniform coating across the panel. The coating was allowed to cure for a period of time (5 minutes) before bead blasting was started.

[0066] Bead Blaster Equipment: Econoline, Grand Haven, Mich. 49417 [0067] Max. psi—120 psi [0068] Min. psi—5 psi

[0069] The bead blaster is a self-contained unit delivering small beads through a high-pressure air nozzle capable of removing coatings / rust / paint from a desired surface. The air pressure...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A release agent composition to facilitate separation of patterns and core boxes from foundry molds and cores comprising a cross-linkable fluorotelomer comprising repeat units derived from a fluoroalkene, a silicone intermediate, a catalyst, and a solvent or a hydroxy-terminated polyalkylsiloxane. Further is provided a method to improve the release properties of molds removed from a pattern or core box comprising applying a composition of the invention to the pattern or core box surface. A process for synthesizing a fluorotelomer or cotelomer from fluoroalkene monomers or comonomers is also provided.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims priority under 35 U.S.C. § 119 from U.S. Provisional Application Ser. No. 60 / 618,464 (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 and to its use as an industrial lubricant, particularly as a mold release agent in the foundry industry. BACKGROUND OF THE INVENTION [0003] Many industrial operations require the use of release agents to reduce the tendency of a molded product to stick to the 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 shapes, such as molds and cores, are fabricated with a mixture of sand and an organic or inorganic binder, sometimes referred to as a “foundry mix”. Molds and cores are produced by chemical or heat hardening of the mixt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22C1/22
CPCB22C3/00
Inventor GULLO, MARK JOSEPHMOFFETT, ROBERT HARVEYGOPALRATNAM, USHA SRINIVASANTESTA, LEONARD GEORGE
Owner EI DU PONT DE NEMOURS & CO