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''no-bake'' foundry mix with extended work time

A technology of working time and mixture, applied in casting molding equipment, molds, manufacturing tools, etc., can solve problems such as short working time

Active Publication Date: 2015-03-25
ASK CHEM LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In another reference (US6291550 to co-owned patent Chen) the ratio of working time to demolding time is higher than 0.5, but the working time is so short that the system taught is not practical for larger demolding times requiring at least 45 minutes part

Method used

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  • ''no-bake'' foundry mix with extended work time

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Experimental program
Comparison scheme
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Embodiment Construction

[0024] A commercially available no-bake foundry binder was chosen as a benchmark with which the experimental results could be compared. The foundry binder used is PEP SET TM I 1670 / II X-2000, purchased from ASK Chemicals Co., Ltd. The foundry binder chosen has two parts, a first part comprising a polyol component and a second part comprising a polyisocyanate component. The liquid catalyst chosen for control was 4-(3-phenylpropyl)pyridine ("4-PPP") (CAS No. 2057-49-0). This catalyst is considered a "slow" catalyst in terms of demold time under standard test conditions.

[0025] In the experimental protocol, test cores were prepared. The catalyst for the first part and test was mixed with WEDRON 540 silica sand. Then, join the second part. The weight ratio of the first part to the second part is 55 / 45, no catalyst is included, the amount of binder is 1% by weight, based on sand ("BOS"),

[0026] Once mixed, the resulting foundry mixture was compacted into dog bone core box...

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PUM

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Abstract

A ''no- bake'' process allows the forming of larger metal castings, by providing longer work times, in the range of about 45 to about 60 minutes. This is achieved using a liquid curing catalyst that is a pyridine, substituted at the second or third position with a moiety having a molecular weight in the range of about 30 to about 100 mwu. Examples of the liquid curing catalyst include 2- ethanolpyridine, 3-chloropyridine and 2-methoxypyridine. When combined with a two-part polyurethane binder precursor and a foundry aggregate, the liquid curing catalyst provides not only the longer work time, but also a strip time that is less than about 167% of the work time, as measured from the point of activating the polyurethane precursors by mixing them in the presence of the curing catalyst.

Description

[0001] Cross References to Related Applications [0002] This application is a non-provisional application claiming priority to US Provisional Application 61 / 657,212, filed June 8, 2012, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to a foundry mix for casting metal parts, for molds and cores formed using the "no-bake" process. More specifically, it relates to a foundry mix comprising a suitable foundry aggregate and two polyurethane binder precursors. Liquid catalysts are used to cure polyurethanes formed by mixing precursors. Preferred catalysts provide a "de-mold time" in excess of 45 minutes with a ratio of "on time" to de-mold time greater than about 0.6, preferably close to 1.0. Background technique [0004] Molds and cores for casting metal articles can be prepared from foundry aggregates and foundry binders. There are several methods for this. [0005] In the "no-bake" method, a foundry...

Claims

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Application Information

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IPC IPC(8): B22C1/22C08G18/00
CPCB22C1/22B22C1/2273C08G18/00C08G18/2018C08G18/28C08G18/72
Inventor M·R·诺切拉G·P·施图策J·克罗克尔
Owner ASK CHEM LLC