JPH0790291A - Water soluble releasing agent for die-casting - Google Patents

Abstract

PURPOSE:To obtain a water soluble releasing agent for die-casting, capable of without causing a dirt in the metal mold, keeping a stable dispersion, and having a good releasing property with a high heat resistance. CONSTITUTION:This releasing agent is characterized by containing a dispersing agent consisting of (A) an inorganic powder (mica, talc etc.), (B) one or more substance selected from a group of silicone, waxes, oil, fat, and metallic soap, (C) a surface active agent, and (D) a dispersing agent consisting of a smectite clay and a water soluble high molecular weight compound, and water. A content of the smectite clay and the water soluble high molecular weight compound is 0.1-10wt.pt. in the total dispersing agent of 100wt.pt., and a ratio between the smectite clay and the water soluble high molecular weight compound can be set as l:0.2-l:2 in wt. ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble mold release agent for die casting used in the casting of automobile parts and electrical components, and more specifically, it is free from mold stains, stable dispersion, and mold releasability. And a release agent having good heat resistance.

[0002]

2. Description of the Related Art As water-soluble die-casting mold release agents, those containing solid powders of graphite, mica, boron nitride, metal oxides, etc. are known, and the above solid powders are stably dispersed in water. A dispersant is included for the purpose. As the dispersant, sodium lignin sulfonate, carboxymethyl cellulose, water glass, phosphate, borate and the like are used (for example, JP-A-2-120397 (boron nitride, sodium lignin sulfonate, carboxymethyl cellulose), JP-A-55-29506 (carboxymethyl cellulose, sodium lignin sulfonate, water glass, phosphate, borate, etc.).

[0003]

However, in the above-mentioned water-soluble mold release agent for die casting, since the mold is often soiled (that is, buildup), it is necessary to polish the mold at regular intervals. There is a problem that work efficiency is poor.
Further, since the dispersion is unstable, there is a problem that the solid powder is settled and the workability is deteriorated. As described above, for water-soluble die castings that have no stains on the mold or can be easily removed even if stains adhere, the dispersion is stable, the work environment can be improved, the mold release is good, and the heat resistance is excellent. The reality is that no release agent has been found.

The present invention overcomes the above-mentioned drawbacks, that is, there is no stain on the mold, the dispersion is stable, and the mold releasability is good.
It is an object of the present invention to provide a water-soluble die-casting mold release agent having good heat resistance.

[0005]

Means for Solving the Problems The inventors of the present invention have earnestly studied the relationship between the type of a dispersant compounded in a release agent and the cleaning property and dispersion stability of mold stains or deposits.
The inventors have found that a composition containing a smectite clay as a dispersant and a water-soluble polymer compound exhibits excellent performance, and completed the present invention. That is, the present invention includes (A) inorganic powder, (B) silicone, wax,
One or more selected from fats and oils and metal soaps,
It is characterized by containing (C) a surfactant and (D) a dispersant comprising a smectite clay and a water-soluble polymer compound.

Examples of the above-mentioned (A) "inorganic powder" in the present invention include graphite, mica, talc, kaolin, boron nitride,
Fluorinated graphite or the like can be used. Examples of the “silicone” as the component (B) include dimethyl silicone and α
-Alkyl silicone such as olefin-modified silicone,
Examples include aryl silicones such as phenyl silicone and α-methylstyryl silicone, and alkylaryl-modified silicones. As the "wax", polyethylene wax and its oxide, paraffin wax, microcrystalline wax, etc. can be used. Further, as the “oil and fat”, animal and vegetable oils and fats such as soybean oil, rapeseed oil, beef tallow, lard and palm oil can be used. The “metal soap” means a fatty acid salt of a metal other than an alkali metal, and magnesium, calcium, zinc, copper, lead, aluminium, iron, cobalt, chromium, manganese, etc. can be used as a main metal. As the above-mentioned (C) "surfactant", a nonionic surfactant and an anionic surfactant can be mainly used.

As the above-mentioned (D) "dispersing agent", it is necessary to use a smectite clay and a water-soluble polymer compound in combination. This is because when a smectite clay alone is blended with a surfactant, the release agent precipitates over time, the dispersibility is poor, and a film is not uniformly formed. The above-mentioned "smectite clay" is a 2: 1 type viscosity mineral, and the negative charge of the silicate layer is 0.6 to 0.3 per 1 of mica (per O ₁₀ (OH) ₂ ). Therefore, the bonding between the layers is weak, the interlayer cations are exchangeable, and water molecules and organic molecules easily enter the layers. The layer spacing greatly changes depending on the types of interlayer cations and interlayer molecules. The reason for using smectite clay is that the amount of isomorphous substitution in the silicate layer is small,
This is because the negative charge is small and the bond with the interlayer cation is weak, so that it has a property of easily swelling with water, and therefore even if it adheres to the mold, it can be easily removed with water.

The above-mentioned "water-soluble polymer compound" is a component having the effect of uniformly adhering the components, and is a semi-synthetic or synthetic product, carboxymethyl cellulose, hydroxyalkyl cellulose, methyl hydroxyalkyl cellulose, polyvinyl alcohol. , Xanthan gum, sodium alginate, lignin sulfonate and the like. Natural water-soluble polymer compounds are unsuitable because they have poor antibacterial properties.

The contents of the smectite clay and the water-soluble polymer compound are preferably in the range of 0.1 to 10 parts by weight when the total amount of the release agent composition is 100 parts by weight.
When the content is less than 0.1 parts by weight, sufficient thickening and dispersing effects cannot be obtained, and when the content exceeds 10 parts by weight, the fluidity of the release agent composition becomes poor. The ratio of smectite clay to water-soluble polymer compound is 1:
A range of 0.2 to 1: 2 is suitable. This ratio is 1:
When it is less than 0.2, the film is not uniformly formed, and 1: (2
This is because the release agent precipitates with time and the dispersibility decreases.

The mold release agent of the present invention is one selected from (A) inorganic powder, (B) silicone, wax, oil and fat and metallic soap after the surfactant (C) is dissolved or dispersed in water. Alternatively, it can be prepared by adding two or more kinds, adding a smectite clay, then a water-soluble polymer compound, and an optional component, and stirring and mixing so as to be uniform.

[0011]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. First, Table 1 shows the release agent composition of the present invention. In addition, the numerical value of the component in Table 1 represents a weight part. Table 1
In, "mica" is the product name "M7500" (average particle size 10 μm) (manufactured by Wandou Kogyo Co., Ltd.), and "talc"
Is the product name "Microace P4" (average particle size 1.5 μm)
(Manufactured by Nippon Talc Co., Ltd.), “silicone” is trade name “KM870; silicone emulsion” (manufactured by Shin-Etsu Silicone Co., Ltd.), and “wax” is trade name “ACP6”.
29 "(manufactured by Allied Chemical Co., Ltd.) is neutralized with morpholine, and nonylphenyl ether (HLB: 12.
The emulsion having the wax concentration of 40% by weight emulsified in 6) was used as the "surfactant", and the ethylene oxide 9 mol adduct of alcohol having 12 to 14 carbon atoms (HLB: 13.
3), "Smectite clay" is the product name "VEEGU
MM "(manufactured by Sansho Co., Ltd.)," Zansan gum "under the trade name" KELZAN "(manufactured by Sansho Co., Ltd.), and" water glass "under the trade name" Keisan Soda No. 1 "(manufactured by Nippon Kagaku Kogyo Co., Ltd.) ) Were used respectively.

[0012]

[Table 1]

The following performance tests were conducted in order to clarify the performance of the release agent of the present invention. The test items and conditions are shown below. Stability The separation state of the liquid after leaving the sample for 1 week was observed and evaluated. The evaluation is indicated by ⊚: no separation, ◯: slightly upper transparent layer, Δ: 50% or more, upper transparent layer, ×: inorganic sedimentation. Sedimentability A sample obtained by diluting a sample 30 times with water was placed in a stirring pressure tank and heated to 200 ° C (SPCC-SB, 1
(00 × 100 × 1 mm) from a height of 200 mm, the amount of deposition (mg) when sprayed 150 times continuously was measured. Removability of deposits It was tested whether the deposits described above could be wiped off with a gauze soaked with water. The display of evaluation is
⊚: Can be completely removed, ∘: Some film remains, ×: Almost cannot be removed Table 2 shows the above test results.

[0014]

[Table 2]

Castability and Deposition Property Using the release agent of Example 3 and Comparative Example 2, the castability and the deposition property of the release agent when tested under the following conditions were tested. In Example 2, there was no oil flow and good castability was exhibited, but the mold release agent of Example 3 did not require mold polishing up to 800 shots, whereas the mold release agent of Comparative Example 2 deposited Therefore, casting could not be performed unless it was ground with a grinder every 200 shots. Comparative Examples 1 to 4
Then, all performance was bad. Further, in Comparative Examples 5 and 6, the stability of the stock solution is poor. On the other hand, Examples 1 to 6 all showed excellent performance. Particularly, in Examples 1 to 3, Example 4 was used.
Although the depositability is slightly lower than those of Nos. 6 to 6, the stability and removability are more excellent.

The present invention is not limited to the specific examples described above, and various modifications may be made within the scope of the present invention depending on the purpose and application. That is,
In the release agent for water-soluble die casting of the present invention, additives such as an antioxidant, an antiseptic / antifungal agent, and a wetting agent can be appropriately used in addition to the above-mentioned essential components.

[0017]

The release agent for water-soluble die casting of the present invention is
There is little dirt on the mold, or even if dirt adheres to the mold, it can be easily removed, and since the dispersion stability and the mold releasability are excellent, it is possible to improve work efficiency.

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Claims (2)

[Claims] 1. Highly water-soluble with (A) inorganic powder, (B) silicone, wax, oil and fat, and one or more selected from metallic soap, (C) surfactant, and (D) smectite clay. A water-soluble mold release agent for die casting, comprising a dispersant composed of a molecular compound. 2. The content of the smectite clay and the water-soluble polymer compound is 0.1 to 10 parts by weight when the total amount of the release agent is 100 parts by weight, and the smectite clay and the water-soluble polymer are contained. The release agent for water-soluble die castings according to claim 1, wherein the weight ratio of the polymer compound is 1: 0.2 to 1: 2.