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Part for Producing Castings and Process of Making the Same

Inactive Publication Date: 2009-08-27
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The present inventors have found that a satisfactory part for casting can be obtained by using a specific dispersant even when an organic fiber content is reduced and completed the invention.

Problems solved by technology

If the organic fiber content is reduced, however, the components will have poor dispersibility, tending to result in poor formation to yield a high proportion of defective castings.
In the case of making base paper by papermaking, in particular, reduction in organic fiber content is liable to produce wavy paper.

Method used

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  • Part for Producing Castings and Process of Making the Same
  • Part for Producing Castings and Process of Making the Same
  • Part for Producing Castings and Process of Making the Same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058]A sample sheet for evaluation was prepared using the following raw materials of base paper for tubular paper plies. The resulting sheet of base paper was evaluated for formation (waviness and disperse state of inorganic powder, etc.), surface roughness, and generation of combustion gas in accordance with the methods described below. The results obtained are shown in Table 1.

Composition of base paper for tubular paper plies(sample for evaluation)(1)Inorganic powder: obsidian powder65.5%by mass(average particle size: 30 μm)(2)Inorganic fiber: carbon fiber (length: 3 mm;4%by massTorayca chopped fiber, available fromToray Industries, Inc.)(3)Organic fiber: used paper12%by mass(4)Thermosetting resin: resol phenol resin18%by mass(Bellpearl S-890 from Air WaterBellpearl Inc.)(5)Papermaking binder: KAIMEN0.25%by mass(6)Papermaking binder: CMC0.25%by mass(7)Water repellantnot addedTotal of (1) to (7):100%by mass(8)Dispersant: sodium β-naphthalenesulfonate-0.5%by massformalin condensate...

example 2

[0087]A sample sheet of base paper was prepared in the same manner as in Example 1, except for replacing the dispersant of Example 1 with the one described below. The resulting paper was evaluated in the same manner as in Example 1. The results obtained are shown in Table 1.

Dispersant: hydroxypropyl cellulose (Klucel H from Hercules). This dispersant, being sparingly soluble, was preliminarily diluted with water to a 1% concentration and then added to a 0.5% by mass on a solid basis.

example 3

[0091]A two-ply tubular part for casting (paper tube) as illustrated in FIG. 1 was formed of base paper having the following composition. The resulting part was evaluated for combustion gas generation and blowback in accordance with the method described below. The results obtained are shown in Table 2.

Composition of base paper for paper tube(1)Inorganic powder: obsidian57.3%by mass(Nice Catch Flower # 330 from KinseiMatec Co., Ltd.)(2)Inorganic fiber: carbon fiber (Pyrofil TR03CM7.2%by massfrom Mitsubishi Chemical Industries, Co., Ltd.)(3)Organic fiber: recycled paper11.5%by mass(4)Thermosetting resin: resol phenol resin17.5%by mass(Bellpearl S-890 from Air Water Bellpearl Inc.)(5)Papermaking binder: KAIMEN3.0%by mass(6)Papermaking binder: CMC3.0%by mass(7)Water repellant: alkyl ketene dimer0.5%by massTotal of (1) to (7):100%by mass(8)Dispersant: sodium β-naphthalenesulfonate-0.5%by massformalin condensate (Demol N from Kao Corp.)The dispersant (8) was added in an amount of 0.5% by ...

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Abstract

A process of producing a part for casting including the step of preparing a raw material slurry containing inorganic fibers, organic fibers, a thermosetting resin, a papermaking binder, and a sulfonate-based and / or a cellulose-based dispersant. The raw material slurry preferably further contains an inorganic powder and / or a water repellant.

Description

TECHNICAL FIELD[0001]The present invention relates to a part for producing castings (hereinafter “part for casting” or simply “part”) that can be use as a runner, etc. in the production of castings and a process of making the part.BACKGROUND ART[0002]Applicant has proposed in JP 2004-174605A a technique relating to a part for casting that can be used as a runner, etc. in the production of castings. The technique provides a tube formed of base paper containing organic fiber, inorganic fiber, and a binder, in which the tube is light, easy to handle, and easy to dispose of after use for casting as compared with historically used refractory materials.DISCLOSURE OF THE INVENTION[0003]It is desirable that such a part for casting containing organic fiber, inorganic fiber, and a binder has a minimized content of the organic fiber in order to reduce the generation of combustion gas (hereinafter sometimes referred simply to as “gas”) accompanying thermal decomposition of the organic fiber dur...

Claims

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Application Information

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IPC IPC(8): D21H13/40D21H13/36D21H13/50
CPCB22C1/08B22C1/00B22C9/08B22C21/12
Inventor TAKAGI, YOSHIMASAYOSHIDA, AKIRA
Owner KAO CORP