KR20160061444A - Release agent composition - Google Patents

Abstract

The present invention relates to an oil-based releasing agent composition for casting capable of having excellent releasing performance when metals, such as aluminum, magnesium, and zinc are casted, and specifically, preventing a mold and molten steel from being deposited at a high temperature by excellent heat stability and oxidation stability. The oil-based releasing agent composition includes aliphatic and aromatic hydrocarbons, silicone oil, mineral oil, an antioxidant, an extreme-pressure additive, and a base oil denaturant. The oil-based releasing agent composition for casting can increase high temperature releasing performance by significantly improving oxidation stability and heat stability using alkyl esters of aliphatic composition as a base oil denaturant.

Description

[0001] RELEASE AGENT COMPOSITION [0002]

The present invention relates to an oil-based release agent composition for casting.

There are various methods such as gravity casting, low-pressure casting and high-pressure casting for casting of non-ferrous metals such as aluminum, magnesium and zinc. Generally, a molten metal in a molten state of a non-ferrous metal is solidified in a metal mold to produce a molded product, Casting mold release agent is used for the purpose of improving moldability with the mold and preventing the adhesion.

As a conventional mold release agent, a water-soluble release agent emulsified in water is often used as a surfactant, which is an emulsifier, in a releasing component such as a modified silicone oil and a wax. However, most of the aqueous release agent is water, Water is diluted with water. Therefore, when used in a hot mold having a temperature of 150 ° C or higher, water vapor is instantaneously generated on the surface of the mold to prevent water from adhering to the surface of the mold. .

Therefore, when using an aqueous release agent, it is necessary to lower the surface temperature of the mold in order to adhere the release agent. In order to do this, a large amount of the release agent is applied and the mold is cooled before the release agent can be effectively adhered. And there were also problems such as defective flow of molten metal due to increase of waste liquid and reduction of mold temperature, decrease of productivity, and shortening of mold life due to frequent change of mold temperature.

In order to solve these problems, an aliphatic or aromatic petroleum hydrocarbon having a high boiling point is added to the mold release agent composition without using water, thereby preventing the phenomenon of the laden frost and applying a small amount of the mold release agent, There have been attempts to improve.

For example, Korean Patent Registration No. 10-1161906 discloses an oil-based release agent composition using a petroleum hydrocarbon having a high boiling point and a flash point in a range of 70 to 170 ° C, a mineral oil, an alkylaryl-modified silicone oil and an additive have.

However, since the above-mentioned technology uses a mineral oil having a weak heat resistance as a main component and a silicone oil as a main component to improve the heat resistance, the silicone oil may contaminate the product surface due to deposition and sticking, Or more is difficult to be added. Therefore, there is a problem that the adhesion sometimes occurs or the releasing property of the mold is high at low temperature.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 2007-326145 discloses a process for producing a fluorine-containing polymer which is capable of improving high-temperature releasability as an additive to petroleum-based hydrocarbons, mineral oils, waxes, silicone oils, etc. Molybdenum dithiocarbamate, molybdenum dithiophosphate, Complex, and the like. However, the organic molybdenum compound may cause corrosion of metals and non-ferrous metals, and the molybdenum disulfide produced by the reaction may cause the surface of the mold and the surface of the molded product to be blackened Which can lead to contamination problems.

In addition, Japanese Patent Laid-Open No. 2011-56518 discloses an oil-based release agent for improving oil mist reduction and high-temperature releasing property by using mineral oil and alkyl-modified silicone oil as petroleum hydrocarbon, sulfur compound as extreme pressure additive and zinc dithiophosphate as a wear- However, due to the sulfur and phosphorus components of sulfur compounds containing active sulfur having high reactivity and zinc dithiophosphate, it is possible to cause discoloration and corrosion on the surface of cast products by reacting with non-ferrous metals such as aluminum, And the like.

In addition, there have been attempts to improve heat resistance by adding powders such as graphite, aluminum oxide and organic clay. For example, in Japanese Patent Laid-Open No. 2010-77321, petroleum hydrocarbons, mineral oils, modified silicone oils and various additives, Discloses a planetary mold release agent containing a powder using an organic clay which is a low amount of an inorganic powder for the purpose of improving a high temperature releasing property with a small amount of water for the purpose of improving the releasability at a high temperature, The addition of a larger amount of powder is effective in preventing deposition at a high temperature and improving the releasability, but the added powder may contaminate the molded product and the mold during the precipitation of the powder and the operation, and the deterioration of the workplace and the working environment after drying There is a problem that it can not be avoided.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in an effort to solve the above problems of the prior art, and an object thereof is to provide an oil-based release agent composition for casting which is excellent in oxidation stability and thermal stability and can minimize corrosion to non- .

However, the technical problem to be solved by the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

The present invention is characterized in that it comprises 0.5 to 5% by weight of a base oil modifier, 6 to 16% by weight of a base oil, 0.2 to 2% by weight of an antioxidant, 0.1 to 1% by weight of an extreme pressure additive, To provide an oil-based release agent composition.

In one embodiment of the present invention, the base oil modifier is an alkylaromatic compound.

In another embodiment of the present invention, the alkylaromatic compound is an alkylnaphthalene or an alkylbenzene.

In another embodiment of the present invention, the base oil is characterized by comprising an alkylaryl-modified silicone oil and a mineral oil.

In another embodiment of the present invention, the antioxidant is characterized by comprising an alkyl diphenylamine and a sterically hindered phenol.

In another embodiment of the present invention, the extreme pressure additive is a sulfurized fatty acid ester.

The present invention also provides a molded article cast using the composition of claim 1.

The casting mold release agent composition for casting according to the present invention can remarkably improve high temperature releasability due to excellent oxidation stability and thermal stability.

In particular, the use of an alkylaromatic compound as a base oil modifier improves oxidation stability and thermal stability, thereby improving high-temperature releasability and minimizing corrosion of a non-ferrous metal molded article.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present inventors have found that the conventional oil type releasing agent used for improving high temperature releasing property and suppressing the fusion phenomenon in the casting process of nonferrous metals is poor in oxidation stability and thermal stability, As a result of efforts to develop a new oil-based release agent composition, it has been found that when an alkylaromatic compound having a molecular structure in which one or two alkyl groups or alkylaryl groups are bonded to naphthalene or a benzene ring and has excellent oxidation stability and thermal stability is used as a base oil modifier It has been confirmed that the oxidation stability and thermal stability of the cast non-ferrous metal are greatly improved, the high temperature releasing property is improved, and the corrosion is minimized, thereby completing the present invention.

That is, the present invention relates to a lubricating oil composition comprising 0.5 to 5% by weight of a base oil modifier, 6 to 16% by weight of a base oil, 0.2 to 2% by weight of an antioxidant, 0.1 to 1% by weight of an extreme pressure additive, To provide an oil-based release agent composition.

The present invention provides an oleaginous mold release composition for casting comprising aliphatic or aromatic hydrocarbons, a base oil modifier, a base oil, an antioxidant and an extreme pressure additive, wherein by using an alkylaromatic compound as the base oil modifier, oxidation stability and thermal stability And it is possible to improve the high temperature releasing property and to minimize the corrosion of the non-ferrous metal molded article.

The alkylaromatic compound used as the base oil modifier may have a molecular structure in which 1 to 2 alkyl groups or alkylaryl groups are bonded to the naphthalene ring or the benzene ring.

More specifically, it is preferable to use a compound having a carbon number of 6 to 30 and a kinematic viscosity at 40 DEG C of 15 to 200 cSt, more preferably a bonded alkyl group or alkylaryl group Alkylaromatic compounds such as alkylnaphthalene and alkylbenzene having a carbon number in the range of 8 to 13 and a kinematic viscosity at 40 DEG C in the range of 100 to 200 cSt may be used. Of these, alkyl naphthalene and alkylbenzene are preferably used , And most preferably alkyl naphthalene.

The alkyl naphthalene is represented by the following formula (1).

[Chemical Formula 1]

Wherein R is a C ₆ to C ₃₀ alkyl or alkene.

The content of the alkyl naphthalene is preferably 0.5 to 5% by weight, and if it is 0.5% by weight or less, the improvement in high temperature releasability can not be expected. If the amount is 5% Lt; / RTI > As used in the examples of the present invention, the alkylnaphthalene exhibits the best effect when it is used in an amount of 2 to 4% by weight.

The alkylbenzene is an alkylbenzene represented by the following formula (2).

(2)

Wherein R is a C10 to C30 alkyl or alkylaryl.

In the present invention, silicone oils and mineral oils may be used alone or in combination as a base oil component.

The silicone oil is used for the purpose of improving heat resistance and releasability at a high temperature. Specifically, dimethyl silicone oil having a kinematic viscosity at 25 ° C (kinematic viscosity) in the range of 20 to 10000 cSt, more preferably having a kinematic viscosity at 25 ° C in the range of 750 to 1200 cSt, methylphenyl silicone oil, methylhydrogen Long-chain alkyl-modified silicone oil, long-chain alkyl-modified silicone oil, alkyl-modified silicone oil and the like can be used. Of these, alkylaryl It is preferable to use a modified silicone oil and a long-chain alkyl-modified silicone oil, and most preferably, an alkylaryl-modified silicone oil used in the examples of the present invention may be used. The alkyl aryl-modified silicone oil is preferably used in an amount of 3 to 7% by weight, and when the amount is 3% by weight or less, the releasing property at high temperature drastically drops. When the amount is 7% by weight or more, The oil is deposited and strongly adhered, and the stain becomes worse. In the end, there is a problem in the surface treatment and paintability of the product surface.

The mineral oil which can be used alone or in combination with the silicone oil as base oil is used for the purpose of imparting releasability in a casting mold at medium and low temperatures and has a kinematic viscosity at 40 DEG C in the range of 100 to 500 cSt, A process oil, turbine oil, spindle oil, gear oil, etc. having kinematic viscosity at 40 DEG C in the range of 250 to 500 cSt can be used.

On the other hand, besides mineral oil, synthetic oil and vegetable oil can be used singly or in combination, and synthetic oils such as polyalphaolefins, polyalkylene glycols, ester and diester oils, polyol esters and complex esters, and castor oil, , Palm oil, woji, lard, and the like.

The content of the mineral oil used in the present invention is preferably 3 to 9% by weight, and when it is 3% by weight or less, the releasability is drastically decreased. When the amount is 9% by weight or more, . More preferably 4 to 6% by weight.

In the present invention, an antioxidant is added to prevent deterioration of the base oil. In general, antioxidants are classified into a primary antioxidant and a secondary antioxidant depending on the mechanism of the antioxidant. The primary antioxidant acts as a hydrogen donor to the peroxy radicals and alkoxy radicals formed by oxygen bonding to form an unstable radical And a secondary antioxidant is a phosphorus-based antioxidant that reacts with a radical-generating material, hydroperoxide, to generate and stabilize an inactive material, and a sulfur-based antioxidant Antioxidants are typical.

In the present invention, primary amine antioxidants such as an amine-based antioxidant and a phenol-based antioxidant, which are excellent in the deterioration preventing effect, are used in combination. Examples of the amine-based antioxidants that can be used include arylnaphthylamine, ketoneamine, Amine type, paraphenylenediamine type, and the like. Examples of the phenol type antioxidant include simple phenol type, bisphenol type, thiobisphenol type, polyphenol type and the like. In the present invention, alkyl diphenylamine was used as an amine-based antioxidant, and sterically hindered phenol was used as a phenol-based antioxidant.

If the total amount of the antioxidants is less than 0.2% by weight, the releasability may deteriorate due to the deterioration of the base oil. If the content of the antioxidants is more than 2% by weight, a bad smell is generated and the deterioration preventing ability is no longer effective .

In addition, the present invention includes extreme pressure additives for the purpose of improving adhesion between a casting of a non-ferrous metal and a mold. Specifically, a sulfur compound, a phosphorus compound, a sulfur-phosphorus compound, a boron compound, an organometallic compound, etc. may be used alone or in combination. In the present invention, there is a fear of irritating odor and corrosiveness A sulfurized fatty acid ester having a sulfur content of 10 to 11% was used.

The content of the sulfurized fatty acid ester is preferably 0.1 to 1 wt%, and when the content is 0.1 wt% or less, deposition may occur during molding. When the content of the sulfated fatty acid ester is 1 wt% or more, It may cause discoloration and corrosion of the product.

The aliphatic and aromatic hydrocarbons may be used for the remainder of the base oil modifier, the base oil, the antioxidant, and the extreme pressure additive for the purpose of improving the adhesion and dryness of the release agent using boiling point and flash point. Synthetic oil or the like may be used. In the present invention, aliphatic hydrocarbons having low toxicity and odor and relatively high stability are used. The aliphatic hydrocarbons used are not particularly limited, and the number of carbon atoms is in the range of 10 to 20, the initial boiling point is in the range of 160 to 300 ° C, And any of petroleum-based aliphatic hydrocarbons within a range of 150 to 150 占 폚 may be used.

In addition, the oil-based release agent composition for casting according to the present invention uses 1.5 wt% of perfume, and the alkyl naphthalene as an aliphatic and aromatic hydrocarbon and silicone oil, mineral oil, antioxidant, extreme pressure additive, , Followed by stirring at 40 DEG C for about 1 hour, to thereby produce an oil-based release agent composition for casting according to the present invention.

That is, the present invention provides, by way of example, a composition comprising 0.5 to 5% by weight of a base oil modifier, 6 to 16% by weight of a base oil, 0.2 to 2% by weight of an antioxidant, 0.1 to 1% by weight of an extreme pressure additive, It was confirmed that the oil-based release agent composition comprising hydrocarbon was excellent in high-temperature releasing property, did not cause a welding phenomenon, and was free from contamination.

The present invention is based on the results shown in Table 4 of the Example, in which the amount of alkyl naphthalene is from 1 to 5% by weight, the alkyl aryl-modified silicone oil is from 4 to 6% by weight, the mineral oil is from 6 to 8% by weight, Having an excellent high temperature releasing property when using an oil-based release agent composition comprising from 0.1 to 1% by weight of a steric hindered phenol, from 0.1 to 1% by weight of a phenol, from 0.1 to 1% by weight of a sulfurized fatty acid ester, from 1 to 2% by weight of a perfume, and from 80 to 85% by weight of an aliphatic hydrocarbon, It can be seen that the deposition phenomenon is effectively suppressed and at the same time, no contamination occurs. 5% by weight alkylaryl-modified silicone oil, 7% by weight mineral oil, 0.5% by weight alkyldiphenylamine, 0.5% by weight of sterically hindered phenol, 0.5% by weight of sulfurized fatty acid ester, 1.5% by weight of fragrance, When using an oil-based release agent composition containing 82 wt% of hydrocarbons, oxidation stability as well as high temperature releasing property and inhibition of the deposition phenomenon can be obtained.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the following examples.

Example  1 to Example  16

The oil-based release agent composition for casting according to the present invention was prepared using alkylnaphthalene as a base oil modifier in the same weight percentages as the composition shown in Tables 1 and 2 below.

Table 1 Examples 1 to 8 (% by weight)

Table 2 Examples 9 to 16 (% by weight)

Table 3 Comparative Examples 1 to 5 (% by weight)

Comparative Example  1-5

In Comparative Example 1-5, a mold release composition for casting was prepared by using only alkylaryl-modified silicone oil and mineral oil as the base oil, without increasing the base oil modifier.

Comparison result

The oil-based release agent composition for casting prepared in Examples 1-16 and 1-6 was subjected to mold releasing at a temperature of 250 ° C., 300 ° C. and 350 ° C., , Pollution, odor, oxidation stability and corrosion resistance were evaluated and the results are shown in Table 4 below.

<Table 4> Test results

As shown in Table 4, when the oil release agent compositions prepared in Examples 2 to 6, in which the addition amount of alkylnaphthalene as the base oil modifier was added within the range of the present invention, were used, excellent release stability, The moldability, the smell, and the corrosion resistance. In particular, when the surface temperature of the mold is 350 ° C, the moldability and the deposition performance are superior to the comparative examples in which the base stabilizer is not added in a high temperature atmosphere.

Test Methods

Aluminum alloy ADC-12 was used as the casting material, and the temperature of the molten metal was 670 ° C. and the mold clamping force was 350 tons. The test conditions were mold surface temperature of 250 ℃, 300 ℃ and 350 ℃, respectively, and performance of mold release, adhesion, stain and odor were evaluated at each temperature. In addition, to evaluate the oxidation stability and corrosiveness of the test solution, test evaluation was conducted by using separate measuring equipment and method.

(1) Dissimilarity test

About 4 cc of the releasing agent test solution was applied to the surface of the mold heated to the respective temperature conditions, and the molded product was visually evaluated for releasability according to the following criteria.

◎ Very easy to release.

○ Relatively easy to release.

△ Does not work well.

X Not at all.

(2) Welding test

About 4 cc of mold release agent test solution was applied to the surface of the mold heated to each temperature condition, and then the castability was visually evaluated based on the same criteria as described below.

◎ No pressing phenomenon occurs at all.

○ There is no pressing phenomenon comparatively.

△ A slight push-stick phenomenon occurs.

X Pressing phenomenon occurs.

(3) Contamination test

About 4 cc of mold release agent test solution was coated on the surface of the mold heated to each temperature condition, and the molded product was visually evaluated for stain resistance according to the following criteria.

◎ There is no pollution.

○ There is no contamination.

△ There is some contamination.

X Pollution is very severe.

(4) Odor test

About 4 cc of the release agent test solution was applied to the surface of the mold heated to the respective temperature conditions, and the product was evaluated for smell according to the following criteria.

◎ No bad odor occurs.

○ There is no comparatively strong smell.

△ Some bad smell occurs.

X Very strong smell occurs.

(5) Oxidation stability test

The oxidation stability test was carried out using a rotating pressure vessel oxidation test (RPVOT) analyzer according to ASTM D 2272, and when the pressure was lowered to 25.4 psi (175 kPa) based on the maximum pressure value after oxidation in an atmosphere of 150 ° C Was measured. The results indicate that the longer the oxidation stability time, the better the oxidation stability of the test solution.

(6) Corrosion test

Mold release agent A test piece of copper is immersed in about 30 ml of the test liquid and held at 100 ° C for 3 hours. After completion of the test, the copper plate specimens were cleaned, and the surface condition was visually observed and evaluated according to the following criteria.

○ No corrosion on the surface or slight discoloration.

△ There is discoloration on the surface.

X There is corrosion on the surface.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (7)

Wherein the lubricant comprises 0.5 to 5% by weight of a base oil modifier, 6 to 16% by weight of a base oil, 0.2 to 2% by weight of an antioxidant, 0.1 to 1% by weight of an extreme pressure additive and the balance aliphatic hydrocarbons Composition.
The method according to claim 1,
Wherein the base oil modifier is an alkyl aromatic compound.
3. The method of claim 2,
Wherein said alkylaromatic compound is alkylnaphthalene or alkylbenzene.
The method according to claim 1,
Wherein the base oil comprises an alkylaryl-modified silicone oil and a mineral oil.
The method according to claim 1,
Wherein said antioxidant comprises an alkyl diphenylamine and a sterically hindered phenol.
The method according to claim 1,
Wherein the extreme pressure additive is a sulfurized fatty acid ester.

A cast formed article produced using the oil release agent composition of claim 1.