Binding resin for foundry sand and catalyst therefor

Details Binding resin for foundry sand and catalyst therefor Binding resin for foundry sand and catalyst therefor

1975-04-03

1977-06-07

Garvin, Patrick P.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252434, 252436, 260 293, 260 38, B01J 2702, B01J 2712

Patent

active

040282716

ABSTRACT:
A phenol-formaldehyde resin composition and formulating process is described which is especially applicable for use as either a heat cured or as a room temperature curing binder for sand in the production of molds and cores for the foundry industry. By the use of an alkali metal sulfite such as Na.sub.2 S.sub.2 O.sub.4 (sodium hydrosulfite) NaHSO.sub.3 or Na.sub.2 S.sub.2 O.sub.3 in the latter stages of resin formulation of the resole, a final product is obtained with excellent "through cure" characteristics and a high strength. The final cure of the phenol-formaldehyde resin or other acid catalyzed resins such as furan-formaldehyde is produced by a benzene or toluene sulfonic acid catalyst that includes a quantity of hydrofluoric or hydrofluorosilicic acid to thereby give additional binding strength when used for sand.

REFERENCES:
patent: 2669552 (1954-02-01), Seymour et al.
patent: 2865966 (1958-12-01), Abadir
patent: 3497488 (1970-02-01), Dawans et al.

Affiliated with

Also associated with

Rating

Binding resin for foundry sand and catalyst therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Binding resin for foundry sand and catalyst therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Binding resin for foundry sand and catalyst therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1236015