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Flow improver for resin coated sand

A fluidity and improver technology, applied in casting and molding equipment, molds, cores, etc., can solve the problems of reducing molding operability, reducing mold strength, cracks, etc., to suppress blocking phenomenon, improve bulk density, Improved operability

Active Publication Date: 2014-09-03
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing calcium stearate cannot fully exert the lubricating effect as a fluidity improver, and the effect of improving the fluidity is insufficient, so there is a problem that the strength of the mold is lowered.
In particular, when manufacturing molds with complex shapes such as cores, it is difficult to inject resin-coated sand into complex and dense molds, and there are problems of quality degradation due to insufficient strength
In addition, the existing calcium stearate also has problems such as poor molding workability, or clogging during the period before the sand is coated with resin.
These issues have not yet been resolved
[0007] In addition, when such a mold is used to cast a casting, when the surface of the mold comes into contact with the slurry of high-temperature molten metal, a so-called slurry phenomenon occurs at the interface between the mold and the slurry. The "infiltration" or "cracking" of the casting makes the casting surface (surface state) of the casting rough, or there may be defects that sand falls on the casting surface

Method used

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  • Flow improver for resin coated sand
  • Flow improver for resin coated sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0089] In a 3L separable flask, add 250 g of mixed fatty acids (containing 2.1% by mass of myristic acid, 30.3% by mass of palmitic acid, 66.5% by mass of stearic acid, 0.8% by mass of arachidic acid and 0.3% by mass of dill acid.), 0.75 g of polyethylene glycol? polypropylene glycol? block ether (manufactured by NOF Co., Ltd., trade name: Pronon#104), and 2500 g of water, and the temperature was raised to 90°C. Next, 77.2 g of 48 mass % sodium hydroxide aqueous solution was added, and it stirred at the same temperature (90 degreeC) for 1 hour, and obtained the fatty acid alkali compound salt aqueous solution. Thereafter, 151.2 g of a 35% by mass calcium chloride aqueous solution was dropped into the fatty acid alkali compound salt aqueous solution over 10 minutes while keeping 90° C. constant. After completion of the dropping, the mixture was aged at 90° C. while stirring for 10 minutes. 1500 g of water was added to the obtained mixed fatty acid calcium salt aqueous solution...

Embodiment 2）

[0091]In a 3L separable flask, add 250 g of mixed fatty acids (containing 2.1% by mass of myristic acid, 30.3% by mass of palmitic acid, 66.5% by mass of stearic acid, 0.8% by mass of arachidic acid and 0.3% by mass of dill acid.), and 2500g of water, until the temperature rises to 80°C. Next, 77.2 g of 48 mass % sodium hydroxide aqueous solution was added, and it stirred at the same temperature (80 degreeC) for 1 hour, and obtained the fatty acid alkali compound salt aqueous solution. Thereafter, 151.2 g of a 35% by mass calcium chloride aqueous solution was dropped into the fatty acid alkali compound salt aqueous solution over 30 minutes while keeping 80° C. constant. After completion of the dropping, the mixture was aged while stirring at 80° C. for 30 minutes. 1500 g of water was added to the obtained mixed fatty acid calcium salt aqueous solution slurry, and the mixture was cooled to 65° C. or lower. Then, it was filtered with a suction filter, washed twice with 1000 g ...

Embodiment 3）

[0093] In a 3L separable flask, add 250 g of mixed fatty acids (containing 1.6% by mass of myristic acid, 24.0% by mass of palmitic acid, 73.4% by mass of stearic acid, 0.7% by mass of arachidic acid and 0.3% by mass of dill acid.), 0.75 g of polyethylene glycol? polypropylene glycol? block ether (manufactured by NOF Co., Ltd., trade name: Pronon#104), and 2500 g of water, and the temperature was raised to 70°C. Next, 76.5 g of 48 mass % sodium hydroxide aqueous solution was added, and it stirred at the same temperature (70 degreeC) for 1 hour, and obtained the fatty acid alkali compound salt aqueous solution. Thereafter, 150.1 g of a 35% by mass calcium chloride aqueous solution was dropped into the fatty acid alkali compound salt aqueous solution over 1 hour while keeping 70° C. constant. Immediately after the completion of the dropping, 1500 g of water was added to the obtained fatty acid alkali compound salt aqueous solution slurry, and the mixture was cooled to 65° C. or ...

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Abstract

A flow improver for a resin coated sand according to the present invention comprises particles of a bivalent fatty acid metal salt having 8 to 24 carbon atoms, and characterized in that the summary value (A) for grain size which is represented by formula (1) fulfills the relationship represented by the formula: A <= 2.0 and the aggregation degree (B) (%) which is represented by formula (2) and is measured using a powder tester fulfills the relationship represented by the formula: B <= 20 in the particles of the fatty acid metal salt which have been allowed to stand for 10 minutes under the environment of 80 DEG C. Summary value (A) for grain size = (D90-D10) / D50 (wherein 1.0 <= D50 <= 40.0) (1) D10: a 10% integrated diameter (mum) in terms of the volume of the particles of the fatty acid metal salt D50: a median diameter (mum) in terms of the volume of the particles of the fatty acid metal salt D90: a 90% integrated diameter (mum) in terms of the volume of the particles of the fatty acid metal salt Aggregation degree (B) = [(mass of the particles of the fatty acid metal salt remaining on a 350 mum-mesh sieve) / 2]100(1 / 1)+[(mass of the particles of the fatty acid metal salt remaining on a 250 mum-mesh sieve) / 2]100(3 / 5)+[(mass of the particles of the fatty acid metal salt remaining on a 150 mum-mesh sieve) / 2]100(1 / 5)] (2).

Description

technical field [0001] The invention relates to a fluidity improver for resin coated sand. Specifically, it relates to a method of injecting the resin-coated sand into the mold during mold manufacturing, which can improve the fluidity of the resin-coated sand, thereby inhibiting the blocking phenomenon of the resin-coated sand, and significantly improving the strength of the mold. , and a fluidity improver for resin-coated sand that can improve the surface state of castings. Background technique [0002] Casting mold refers to the resin-coated sand obtained by combining silica sand and other refractory aggregates for casting molds with binders such as phenol resin, and further adding a fluidity improver. The obtained ones have been widely used in the past due to their excellent characteristics such as good dimensional accuracy. [0003] Also, as the fluidity improver, fatty acid metal salts can generally be used. Mix the refractory aggregate and binder to cover the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/24B22C1/2253
Inventor 吉村健司
Owner NOF CORP
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