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Phenol resin for shell molding, process for production of the resin, resin-coated sand for shell molding, and molds obtained using same

A phenolic resin and manufacturing method technology, applied in the directions of casting molds, casting mold components, manufacturing tools, etc., can solve the problems of undisclosed casting mold crack tar generation, mold corrosion, undisclosed and other problems, to solve the problem of gas defects, reduce The amount of tar generated and the effect of improving shrinkage

Active Publication Date: 2011-11-16
ASAHI YUKIZAI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Enumerated novolac resin or resol type phenolic resin in the described embodiment, described novolac type phenolic resin or resole type phenolic resin is to use catalysts such as hydrochloric acid or ammonia water, make α-naphthol or β -Naphthol, or the above-mentioned naphthol and phenol are obtained by reacting with formalin, but especially in the resin using the above-mentioned hydrochloric acid as a catalyst, there are safety problems caused by the violent reaction during resin production, and casting molding Mold corrosion problem when
In addition, this Patent Document 3 does not disclose at all the phenolic resin obtained by using oxalic acid as a catalyst and the RCS obtained by using the same, and it does not disclose at all the characteristics of mold cracking and tar generation that are problems when manufacturing molds.

Method used

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  • Phenol resin for shell molding, process for production of the resin, resin-coated sand for shell molding, and molds obtained using same
  • Phenol resin for shell molding, process for production of the resin, resin-coated sand for shell molding, and molds obtained using same
  • Phenol resin for shell molding, process for production of the resin, resin-coated sand for shell molding, and molds obtained using same

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Embodiment

[0037] Hereinafter, several embodiments of the present invention are given to illustrate the present invention more specifically, and it goes without saying that the present invention is not limited by the contents described in these embodiments. In addition, it should be understood that in the present invention, in addition to the following embodiments, and further in addition to the above specific description, it also includes various changes based on the knowledge of those skilled in the art within the scope of not departing from the gist of the present invention , corrections, improvements, etc.

[0038] In addition, "part" and "%" in the following description represent "parts by mass" and "% by mass", respectively, unless otherwise specified. In addition, various characteristics of the produced shell type RCS were measured according to the following test methods.

[0039] -Determination of tar generation amount-

[0040] After putting 4 samples for mold strength measure...

manufacture example 1-

[0048] Put 800 parts of phenol, 200 parts of 1-naphthol, 411 parts of 47% formalin and 3 parts of oxalic acid into the reaction vessel equipped with a thermometer, a stirring device and a condenser. Next, the temperature of the reaction vessel was slowly raised, and after reaching the reflux temperature, the reflux reaction was carried out for 90 minutes, further dehydration was carried out under normal pressure, and then heated to 180° C. under reduced pressure to remove unreacted phenol, thereby obtaining phenolic resin 1 . The number average molecular weight of the phenolic resin 1 is 850.

[0049] -Manufacturing example 2-

[0050] Phenolic resin 2 was obtained in the same procedure as in Production Example 1, except that 950 parts of phenol, 50 parts of 1-naphthol, 434 parts of 47% formalin, and 3 parts of oxalic acid were added.

manufacture example 3-

[0052] Phenolic resin 3 was obtained in the same procedure as in Production Example 1 except that 700 parts of phenol, 300 parts of 1-naphthol, 395 parts of 47% formalin, and 3 parts of oxalic acid were added.

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Abstract

The present invention provides a phenol resin for shell molding, which can advantageously provide molds that produce little tar in casting and that have both low thermal expansion coefficients and high collapsibility; a resin-coated sand obtained using same; and molds obtained using the resin-coated sand. A phenol resin having such useful characteristics is obtained by reacting a phenol component comprising both a phenol and a naphthol with an aldehyde using a divalent metal salt and / or oxalic acid as the reaction catalyst.

Description

technical field [0001] The present invention relates to a phenolic resin for shell molding, a method for producing the same, resin-coated sand for shell molding, and a casting mold formed using the same, and particularly relates to a product capable of suppressing thermal decomposition products (hereinafter abbreviated as "tar") generated during casting A phenolic resin for shell molding that can be produced in a large amount while solving the problems of thermal expansion and shrinkability, a method for producing the same, resin-coated sand obtained by using the phenolic resin, and a mold formed by using the phenolic resin. Background technique [0002] Conventionally, in shell mold casting, shell molds are generally used in which resin-coated sand (hereinafter abbreviated as "RCS") is used for thermoforming, thereby forming a shell mold having a desired shape. The resin-coated sand is obtained by kneading refractory particles (casting sand), phenolic resin (binder), and if...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/00B22C1/22B22C9/02C08G8/04
CPCC08G8/04Y10T428/2991C08G8/00B22C1/22B22C9/02
Inventor 森敬一高间智宏
Owner ASAHI YUKIZAI KOGYO CO LTD
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