Method to improve humidity resistance of phenolic urethane foundry binders

A technology of phenolic urethane and moisture resistance, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of variable moisture resistance and sample deterioration, and achieve the effect of improving moisture resistance

Inactive Publication Date: 2002-04-10
MOMENTIVE SPECIALTY CHEM RES BELGIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] A disadvantage of phenolic urethane cold box binders is that specimens prepared from this type of binder system substantially deteriorate under wet conditions
However, using only hydrofluoric acid, e.g. yields very variable results for improved moisture resistance
Therefore, it has been considered inappropriate to use only hydrofluoric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1 - Effect of adding hydrofluoric acid and silica gel to cold box binder

[0080] In this example, the effect of adding various amounts of hydrofluoric acid and silica gel on moisture resistance was determined. Comparative examples included adhesives that did not use hydrofluoric acid and did not use silica gel. For these tests, 48% w / w aqueous hydrofluoric acid, available from Aldrich Chemical Company, Milwaukee, Wisconsin, was used. The silica gel used was Grade 63 silica gel, available from Fischer Scientific Company, Hanover Park, Illinois. When mindful of its use, the fluorine-containing acid and the inorganic silicon compound were mixed with the Part 1 binder component to form a liquid mixture having a viscosity similar to that of the Comparative Part 1 binder component. The aggregate used was Wedron530. The total binder used was 1.0% by weight of the sand. The ratio of part 1 binder component to part 2 binder component was 55:45. The part 1 binder co...

Embodiment 2

[0096] Example 2 - Effect of Adding Hydrofluoric Acid and Silica Gel to Cold Box Adhesives

[0097] In this example, as shown in Example 1 above, the effect of adding various amounts of hydrofluoric acid and silica gel on moisture resistance was determined. Comparative examples included adhesives that did not use hydrofluoric acid and did not use silica gel. For these tests, 48% w / w aqueous hydrofluoric acid, available from Aldrich Chemical Company, Milwaukee, Wisconsin, was used. The silica gel used was catalog no. 28859-4, available from Aldrich Chemical Company, Milwaukee, Wisconsin. When mindful of its use, the fluorine-containing acid and the inorganic silicon compound were mixed with the Part 1 binder component to form a liquid mixture having a viscosity similar to that of the Comparative Part 1 binder component. The aggregate used was Wedron530. The total binder used was 1.0% by weight of the sand. The ratio of part 1 binder component to part 2 binder component was ...

Embodiment 3

[0113] Example 3 - Effect of Adding Hydrofluoric Acid and Silica Gel to Cold Box Adhesives

[0114] In this example, the effect of adding reduced and varying amounts of silica gel in combination with hydrofluoric acid on moisture resistance was determined. Comparative examples included adhesives that did not use hydrofluoric acid and did not use silica gel. For these tests, 48% w / w aqueous hydrofluoric acid, available from Aldrich Chemical Company, Milwaukee, Wisconsin, was used. The silica gel used was catalog no. 28859-4, available from Aldrich Chemical Company, Milwaukee, Wisconsin. When mindful of its use, the fluorine-containing acid and the inorganic silicon compound were mixed with the Part 1 binder component to form a liquid mixture having a viscosity similar to that of the Comparative Part 1 binder component. The aggregate used was Wedron530. The total binder used was 1.0% by weight of the sand. The ratio of part 1 binder component to part 2 binder component was 5...

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PUM

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Abstract

An embodiment of the present invention provides a method for improving the tensile strength of foundry cores and molds. More particularly, an embodiment of the present invention provides an improved binder for foundry cores and molds that include a fluoride bearing acid in combination with an inorganic silicon compound. Alternately, the improved binder may include a fluoride bearing acid in combination with a boron compound. In a preferred embodiment, a modified part 1 binder component includes a combination of hydrofluoric acid and an inorganic silicon compound.

Description

technical field [0001] This invention relates to improved phenolic urethane adhesive compositions for bonding foundry cores and molds. The invention also relates to a method of improving the strength of cores and molds prepared with this binder, in particular the moisture resistance of these cores and molds. The present invention further relates to reaction products of acidic fluorides and silica useful in phenolic urethane foundry binder compositions having improved moisture resistance. Background technique [0002] Phenolic urethane binders or binder systems for foundry cores and molds are known. In the field of foundry, cores and molds for making metal castings are generally prepared from aggregate materials such as sand and a cohesive amount of binder or binder system. Typically, after the aggregate material and binder system are mixed, the resulting mixture is plugged, sprayed or formed into the desired shape or pattern of a core or mold and then cured to a solid. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/18B22C1/20B22C1/22
CPCB22C1/2273B22C1/02C08K3/24C08K3/16C08K3/38C08K3/34
Inventor R·A·莱塔B·K·蒂特K-T·特斯L·S·扎茨基
Owner MOMENTIVE SPECIALTY CHEM RES BELGIUM
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