JPH04238643A - Water soluble die releasing agent composition for die casting - Google Patents

Abstract

PURPOSE:To improve working environment and to obtain a product having good releasing property from a die and casting surface by using a water soluble die releasing agent composition incorporating polybasic acid salt and silicone. CONSTITUTION:The polybasic acid salt is a component having action for preventing contact and melt-sticking between metals, and adipic acid, chlorendic acid, succinic acid, glutacenic acid, etc., can be used. Further, the silicone is a component having actions for preventing contact and melt-sticking between metals and improving wettability to the die and dimethyl silicone, alkyl silicone of alpha-olefin modified silicone, etc., phenyl silicone, etc., can be used.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-soluble die-casting mold release agent for use in die-casting non-ferrous metals such as aluminum, aluminum alloys, magnesium, magnesium alloys and zinc alloys.

0002

BACKGROUND OF THE INVENTION Die casting mold release agents are broadly classified into oil-based mold release agents and water-soluble mold release agents. Oil-based mold release agents are mainly composed of graphite with mineral oil and wax added, and if necessary, extreme pressure agents and emulsifiers.
Recently, water-soluble mold release agents have become the main type of mold release agent because of problems such as the work environment and air pollution caused by oil smoke and fire, as well as problems such as the casting surface of the product turning black and dirty. As a water-soluble mold release agent, a mold release agent mainly composed of graphite and water (for example, JP-A-59
A composition disclosed in Japanese Patent No. 232648) is known. However, since the above-mentioned water-soluble mold release agent contains graphite, there are problems such as the graphite staining the product by coloring it black and contaminating the working environment.

[0003] In order to solve the above problems, water-soluble mold release agents that do not contain graphite have been proposed. A mold release agent disclosed in Japanese Patent No. 63-265996 and the like is known. The invention described in JP-A-61-27141 combines a sulfonic acid salt of a condensate of a phenol compound and formaldehyde into an aqueous emulsion consisting of paintable silicone, wax, a nonionic surfactant, and water. This water-soluble mold release agent for die casting has excellent spreadability to molds. Unexamined Japanese Patent Publication 1986
The invention described in Publication No. 97695 consists of an aqueous dispersion containing silicone oil, water-soluble glass (composition consisting of P2O5, B2O3, M2O (M is an alkali metal)), wax, oily substance, and surfactant. A lubricant for metal forging and casting. The invention described in JP-A-63-265996 is a lubricant for die casting containing silicone oil, a hydrocarbon liquid polymer, natural wax, a surfactant, and a solid lubricant. However, although the conventional water-soluble mold release agents described above can improve the working environment, the heat resistance of the mold release agent film during die casting is insufficient, resulting in poor mold release properties and the formation of cavities. There are problems such as how easy it is to occur. As mentioned above, the reality is that no water-soluble mold release agent has been found that can improve the working environment, has good mold release properties, and does not generate blowholes.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water-soluble mold release agent that can improve the working environment, has good heat resistance, and is less likely to produce blowholes.

[0005]

[Means for Solving the Problem] As a result of extensive research into the relationship between the composition of the mold release agent and the heat resistance of the film, the present inventors found that a composition containing a polybasic acid salt and silicone has a high heat resistance. We discovered that it is excellent and suppresses the occurrence of blowholes,
The invention has been completed. That is, the present invention is a water-soluble mold release agent composition for die casting characterized by containing a polybasic acid salt and a silicone.

(Polybasic acid salt) The polybasic acid salt in the present invention has excellent heat resistance, so it easily remains on the mold, and is suitable for metal/
It is a component that has the effect of preventing metal-to-metal contact and welding, and uses one or more compounds selected from alkali metals and alkaline earth metals. As an alkali metal salt,
Salts such as sodium, potassium, and lithium can be used; examples of alkaline earth metal salts include calcium,
Salts such as barium and strontium can be used.

Examples of the polybasic acids include adipic acid, het acid, succinic acid, glutaconic acid, dodecanoic acid, citraenoic acid, mesaconic acid, glutaconic acid, itaconic acid, sebacic acid, azelaic acid, maleic anhydride, and fumaric acid. acid,
Aliphatic polycarboxylic acids such as tricarballylic acid, aconitic acid, camphoronic acid, tetrachloromaleic anhydride, phthalic anhydride, isophthalic acid, trimellitic anhydride, pyromellitic acid, benzenepentacarboxylic acid, tetrahydrophthalic anhydride, Aromatic polycarboxylic acids such as hexahydrophthalic anhydride, pyromellitic anhydride, and terephthalic acid can be used.

The content of the polybasic acid salt is suitably in the range of 1 to 40 parts by weight, when the total amount of the polybasic acid salt, silicone, water and other optional components is 100 parts by weight. If the content is less than 1 part by weight, it will be difficult to form a uniform film and welding will not be prevented, and if it exceeds 40 parts by weight, the solubility will decrease.

(Silicone) The silicone used in the present invention has excellent heat resistance, easily remains on the mold, and has the effect of preventing metal/metal contact and welding and improving wettability to the mold. It is a component that has

Examples of the silicone include alkyl silicones such as dimethyl silicone and α-olefin modified silicone, aryl silicones such as phenyl silicone and α-methylstyryl silicone, and alkylaryl modified silicones containing the above-mentioned alkyl and aryl groups. . As these silicones, commercially available silicone emulsions can be used.

Further, the number of carbon atoms in the alkyl group and alkylaryl group of the silicone is preferably in the range of 1 to 8. When the number of carbon atoms in the alkyl group exceeds 8,
This is undesirable because it tends to be thermally decomposed, the heat resistance decreases, and blowholes are more likely to occur. Further, suitable examples of the aryl group include a phenyl group and an α-methylstyryl group.

[0012] The content of the silicone is suitably in the range of 1 to 30 parts by weight, when the total amount of all components of the mold release agent is 100 parts by weight. This is because if the content is less than 1 part by weight, there is no effect of preventing seizure, and if the content exceeds 30 parts by weight, there is no change in the anti-seizure effect and a stable emulsion cannot be obtained.

(Optional Components) In addition to the above-mentioned essential components, the mold release agent composition of the present invention may contain mineral oils such as spindle oil and machine oil, soybean oil, rapeseed oil, beef tallow, lard, palm oil, etc. Oils and fats, fatty acid esters, fatty acids, synthetic esters, polyethylene wax and its oxides, waxes such as paraffin wax and microcrystalline wax, antioxidants, preservatives and fungicides, inorganic compounds such as talc, thickeners,
Dispersants, wetting agents, emulsifiers, and the like can be used as appropriate.

(Production method) The mold release agent of the present invention is prepared by dissolving or dispersing a polybasic acid or a salt of a polybasic acid in water, and then adding and mixing a silicone emulsion and other optional ingredients. be able to.

[0015]

[Examples] The present invention will be specifically explained below with reference to Examples and Comparative Examples, but the present invention is not limited in any way by the following Examples and Comparative Examples. First, Table 1 shows the mold release agent composition of the present invention. Note that the numerical values of the components in Table 1 represent weight %.

[0016]

[Table 1]

In order to clarify the performance of the mold release agent composition of the example of the present invention, the following performance test was conducted. The performance test items and test conditions are described below, and the test results are shown in Table 2.

(Performance test 1) Test piece: SPCC-SP, 100 x 100 x 2 mm Release agent dilution ratio: 10 times Spray: 1 Kgf/cm2 x 2 s x 2 times Air blow:
3Kgf/cm2×2s

(Performance evaluation) High temperature adhesion (adhesion amount and spread area) and deposition amount were evaluated. High-temperature adhesion is a performance that affects mold releasability, and deposition property is a performance that affects build-up of the mold mating surface and is related to product precision and processing efficiency. In addition, Comparative Example 1 in Table 2 is a graphite-based mold release agent (active ingredient concentration 30% by weight) used for casting aluminum alloys, and Comparative Example 2 is a graphite-based mold release agent (active ingredient concentration 30% by weight) that is used for casting aluminum alloys. Comparative Example 3 is a mold release agent whose main component is an inorganic substance used in the casting of aluminum alloys (trade name "Graphace WK-4A" manufactured by Hanano Shoji Co., Ltd.). company)
It is.

[0020]

[Table 2]

As is clear from Table 2, all of the mold release agent compositions of the examples have superior high-temperature adhesion properties compared to Comparative Example 2, and in terms of deposition properties, all of the mold release agents of the examples are superior to those of comparative example 2. Better than Examples 1 and 3.

(Performance Test 2) Performance tests were conducted on the mold release agent compositions of Examples 2 and 4 and Comparative Examples 1 and 3 using an actual casting machine. The test conditions are described below, and the results are shown in Table 3. Casting: Mission case Mold clamping force: 2,250t Cycle time: 120s Performance evaluation items: Seizure, gas amount, dirt around the machine, and buildup were evaluated. Note that the gas amount is a performance related to the occurrence of blowholes.

[0023]

[Table 3]

The evaluation display is as follows. Concerning stains around the machine, ○: Slightly white color but can be washed with water, △: Slightly white color adheres, ×: White color adheres, XX: Significant stain due to graphite scattering.

Regarding the deposition property, ○: Few, △: Slightly present, ×: Slightly more, XX: Significantly more represents.

[0026]

Effects of the Invention The water-soluble mold release agent composition for die casting of the present invention has excellent mold release properties due to the excellent heat resistance of the coated film, low buildup, and difficulty in forming blowholes.
Products with good nest skin can be manufactured. Furthermore, by using the mold release agent of the present invention, it is possible to improve the working environment and the surface finish.

Claims (2)

[Claims] 1. A water-soluble mold release agent composition for die casting, comprising a polybasic acid salt and a silicone. 2. The water-soluble mold release agent composition for die casting according to claim 1, wherein the polybasic acid salt is at least one selected from alkali metals and alkaline earth metals.