A foundry binder comprising one or more cycloalkanes as a solvent

A binder and cycloalkane technology, which is applied in the field of foundry binders, can solve the problems of non-polar solubility, limited dosage, etc.

Inactive Publication Date: 2012-05-30
ASK CHEM LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique also has some disadvantages such as gel formation in the acid wash solution used to reduce amine solidification gases and the white silica fines that form can deposit on castings, accumulate in used sand or in the air carrier tape
[0013] Cycloaliphatic-free solvents such as kerosene and tetradecene have been added in small amounts to polyol-polyisocyanate binders, especially phenolic polyurethane cold box and no-bake binders, but their strong nonpolar solubility leads to Greatly limit its use in binder formulations to less than 5% by weight of the combined weight of the total binder, Part I (polyol component) and Part II (polyisocyanate component)

Method used

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  • A foundry binder comprising one or more cycloalkanes as a solvent
  • A foundry binder comprising one or more cycloalkanes as a solvent

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Experimental program
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Embodiment A、B、1 and 2

[0071] Test casting cores were prepared by the cold box method: Congleton HST 50 quartz sand (from WBB minerals, Sibelco UK Ltd.) was first mixed with the binder formulation described in Table 1 in a Kenwood Chef mixer for one minute. The resole phenolic resin (RESIN) used in Part I of the binder was a polybenzyl ether type phenolic resin prepared by methods well known in the art using zinc acetate dihydrate as a catalyst. The polyisocyanate used in part II of the binder was poly(methylene diphenylisocyanate) with a functionality of 2.7. Equal amounts of Part I and Part II were used and the total amount of binder used was 1.2% by weight of the sand weight.

[0072] The resulting foundry mixture was pressed into the cavity by blowing the foundry sand mixture into a metal form (here solidified by the cold box method as described in US Patent 3,409,579) to obtain a test core measuring 120mm x 22.4mm x 6mm . Samples were formed by contacting the test cores with a mixture of trie...

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Abstract

A foundry binder comprising (a) a polyol component selected from the group consisting of phenolic resins, polyether polyols, polyester polyols, aminopolyols, and mixtures thereof, and (b) a polyisocyanate component, wherein component (a) and/or (b) further comprise, as a solvent, one or more cycloalkanes.

Description

[0001] related application [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 266,036, filed July 16, 2009. Background technique [0003] In the foundry industry, one of the procedures used to manufacture metal parts is "sand casting". In sand casting, disposable foundry shapes (such as molds, cores, sleeves, pouring cups, covers, etc.) are produced from a foundry mix comprising a mixture of refractory material (usually sand) and an organic or inorganic binder. [0004] Cast shapes are usually produced by the so-called no-bake, cold box and / or thermosetting methods. In the no-bake method, a liquid curing catalyst is mixed with refractory materials and binders to form a foundry mix, which is then shaped in a mold. The foundry sand mixture is shaped by compacting it in a mold and allowing it to cure until it is self-supporting. In the cold box process, a vaporous curing catalyst is passed through a forming mixture of aggregate and bin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
CPCB22C1/2213B22C1/2253B22C1/22
Inventor 马克·R·斯坦克利夫约尔格·克罗克尔王显平
Owner ASK CHEM LLC
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