Sand casting mold oil composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of sand mold casting demolding, and discloses a sand mold casting demolding oil composition as well as a preparation method and application thereof. The sand mold casting mold oil composition provided by the invention comprises the following components in parts by weight: a) 0.1-1 part of an antioxidant; b) 0.1-5 parts of an antirust agent; c) 1-10 parts of an oiliness agent; and d) 60-100 parts of base oil. The mold-releasing oil composition for sand mold casting has good extreme pressure lubricating performance, wetting performance, anti-rust performance and oxidation resistance at the same time. The contact angle of the wettability index is small, and the lubricating oil can be more uniformly spread on molding sand and metal surfaces to form a layer of uniform isolation lubricating oil film, so that better demolding performance is provided. And the good demolding performance can meet the sand mold demolding process requirement and the surface quality requirement of a demolded casting, the surface of the metal casting is not corroded, and the subsequent casting surface treatment procedure is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of mold release for sand casting, and more specifically, to a sand casting mold release oil composition, a preparation method thereof, and an application thereof. Background Art

[0002] Sand casting refers to a casting method for producing castings in sand molds. Castings of steel, iron, and most non-ferrous alloys can be obtained by sand casting. Since the molding materials used in sand casting are inexpensive and readily available, and the mold manufacturing is simple, it can adapt to single-piece production, batch production, and mass production of castings. For a long time, it has been the basic process in casting production.

[0003] The basic process of traditional sand casting technology is divided into steps such as sand mixing, mold making, core making, molding, pouring, shakeout, grinding and processing, and inspection. Mainly by pouring molten metal liquid into the inner cavity of the mold made of molding sand, the casting is obtained after the metal cools and forms. In the actual sand casting process, since the molding sand is in direct contact with the molten metal liquid, it often causes the metal casting to adhere to the sand mold and the phenomenon of sand sticking occurs, and the casting is not easily demolded, thus affecting the quality of the casting. Therefore, it is necessary to coat a layer of lubricating oil on the inner wall of the cavity to isolate the mold cavity from the metal casting for the purpose of easy demolding, and it also helps to improve the surface quality of the casting.

[0004] Since the domestic sand mold release oil products are relatively novel in technology and there is not much publicly available prior art, currently, the publicly available mold release agents are mostly water-based emulsified mold release agents suitable for aluminum alloy die casting. Therefore, it is of great significance to invent a pure oil type sand mold release oil suitable for sand casting technology.

[0005] Sand mold release oil belongs to oil-based mold release agent products. The biggest difference from water-based mold release agents is that the product formula does not contain various surfactants and other emulsifier components. When applied, it does not need to be diluted with water into a water-based emulsion and can be directly sprayed with pure oil. The product is insoluble in water. And the emulsifier component that must be used in the formula of water-based emulsified mold release agent is a typical amphiphilic (hydrophilic and lipophilic) compound, which has a polar or hydrophilic (i.e., water-soluble) part and a non-polar (i.e., hydrophobic or lipophilic) part. There is an essential difference between the emulsifier and the oil-based agent included in the sand mold release oil. Although some emulsifier types include fatty acid esters, the fatty acid ester type emulsifiers are also amphiphilic compounds with hydrophilic and lipophilic properties after reaction combination, while the oil-based agent is a lipid substance with only lipophilicity.

[0006] In addition, the application scenarios of water-based mold release agents are mostly high-pressure aluminum alloy die casting processes, while the application scenarios of oil-based mold release oils are mostly atmospheric pressure sand casting processes. There are differences in the application scenarios and processes between water-based and oil-based mold release agents.

[0007] Patent CN101010156A mentions an oil-based mold release agent, which contains 70 to 98 parts by weight of a solvent with a specified flash point; 1 to 10 parts by weight of a high-viscosity mineral oil and synthetic oil; 15 parts by weight or less of silicone oil; and 1 to 5 parts by weight of an additive with lubricating function. The flash point of the mold release agent is in the range of 70 to 170 °C, and the dynamic viscosity at 40 °C is 2 to 30 mm2 / s. However, this patent does not evaluate the conventional key properties of the mold release agent such as its lubricating performance, antioxidant performance, film-forming wetting and spreading performance, etc., and does not explain the application scenarios of its composition. Summary of the Invention

[0008] The purpose of the present invention is to provide a sand casting mold release oil composition, its preparation method and application, so as to solve the technical problem that the oil-based mold release oil in the prior art cannot simultaneously have good extreme pressure lubricating performance, wetting performance, rust prevention performance and antioxidant performance.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is:

[0010] The first purpose is to provide: a sand casting mold release oil composition, in parts by weight, comprising the following components:

[0011] a) 0.1 to 1 part of antioxidant;

[0012] b) 0.1 to 5 parts of rust inhibitor;

[0013] c) 1 to 10 parts of oiliness agent;

[0014] d) 60 to 100 parts of base oil.

[0015] Further preferably, the rust inhibitor includes alkyl phosphate imidazole salt and auxiliary rust inhibitor, and the auxiliary rust inhibitor includes at least one of sodium petroleum sulfonate, phosphate ester and dodecenyl succinic acid; preferably, the ratio of the number of parts of the alkyl phosphate imidazole salt to the auxiliary rust inhibitor is (0.05 to 2):(0.05 to 3); preferably (0.5 to 1.8):(0.4 to 2.5); more preferably (1 to 1.6):(0.4 to 2).

[0016] Further preferably, the oiliness agent includes dodecanol, oleic acid and auxiliary oiliness agent, and the auxiliary oiliness agent includes at least one of isooctyl palmitate, dioctyl phthalate and trimethylolpropane oleate; preferably, the ratio of the number of parts of dodecanol, oleic acid and the auxiliary oiliness agent is (0.3 to 2):(0.3 to 2):(0.4 to 6); preferably, the ratio of the number of parts of dodecanol, oleic acid and the auxiliary oiliness agent is (0.5 to 2):(0.5 to 2):(2.5 to 3.5).

[0017] Further preferably, by weight parts, it comprises the following components:

[0018] a) 0.3 to 0.9 parts of antioxidant, preferably 0.5 to 0.9 parts;

[0019] b) 1 to 4 parts of rust inhibitor, preferably 1.5 to 3 parts;

[0020] c) 2 to 8 parts of oiliness agent, preferably 3 to 6 parts;

[0021] d) 70 to 95 parts of base oil, preferably 90 to 95 parts.

[0022] Further preferably, the antioxidant comprises an alkyl diphenylamine antioxidant and a co-antioxidant, and the co-antioxidant is at least one of an aromatic amine antioxidant, a phenolic ester antioxidant, N-phenyl-α-naphthylamine and a dialkyldithiocarbamate; preferably the co-antioxidant is at least one of N-phenyl-α-naphthylamine and a dialkyldithiocarbamate;

[0023] Preferably, the parts ratio of the alkyl diphenylamine antioxidant to the co-antioxidant is (0.05 to 1):

[0024] (0.05 to 1); preferably (0.4 to 0.8):(0.2 to 1).

[0025] And / or, the base oil is selected from at least one of highly refined mineral oil, vegetable oil and synthetic oil.

[0026] The highly refined mineral oils HVIⅡ-2, 60N, W1-60, W1-80, W1-100 and No. 5 white oil are all commercially available, and the highly refined mineral oil HVIⅡ-2 is classified according to the classification standard of Sinopec base oil.

[0027] Further preferably, the base oil is selected from at least one of highly refined mineral oils HVIⅡ-2, 60N, W1-60, W1-80, W1-100 and No. 5 white oil; preferably 60N, W1-60 and W1-80, optionally highly refined mineral oils HVIⅡ-2 and W1-100;

[0028] Preferably, the parts ratio of 60N, W1-60, W1-80 is (20 to 25):(15 to 35):(30 to 50).

[0029] Further preferably, the maximum non-seizure load PB of the sand casting release oil composition is not less than 314 N;

[0030] And / or, for the 45# steel sheet, under the condition of damp heat analysis at 49°C ± 1°C and Class A, the rust prevention time is not less than 80 h;

[0031] And / or, at 150°C, the rotary oxygen bomb time is not less than 150 min, preferably 150 - 500 min, more preferably 200 - 300 min, and further preferably 200 - 280 min;

[0032] And / or, the contact angle is less than 20 degrees, preferably less than 15 degrees, and more preferably less than 13 degrees.

[0033] The second object is to provide: a preparation method of a sand casting release oil composition, including: mixing and stirring each component to obtain the sand casting release oil composition.

[0034] Further preferably, the preparation method includes the following steps,

[0035] S1. Gradually heat the base oil to 50 - 60°C under continuous stirring;

[0036] S2. Add an oiliness agent and mix them;

[0037] S3. Add a rust inhibitor and an antioxidant, mix them, stop heating under continuous stirring, and stop stirring until the temperature drops to room temperature to obtain the sand casting release oil composition.

[0038] The third object is to provide: the application of the sand casting release oil composition in the sand casting release process.

[0039] The beneficial effects of the present invention are at least as follows:

[0040] In the present invention, the rust inhibitor, the oiliness agent, and the antioxidant respectively adopt compounding formulas. The compounded rust inhibitor can ensure high rust prevention performance with a very small total addition amount. The compounded oiliness agent can effectively improve the lubrication performance, wetting performance, and film-forming performance, making the sand casting release oil more suitable for the requirements of the fluidity and lubricity of molten metal during high-temperature metal solution casting, so as to meet the working conditions with high requirements for lubricity and film-forming properties in the lubrication part of the sand casting release process. The compounded antioxidant can have excellent antioxidant performance of the product under the premise of a very small total addition amount of the antioxidant, avoiding the situation that the nozzle is blocked by sludge after the oil product is oxidized and deteriorated.

[0041] Compared with other release oil compositions, the sand casting release oil composition of the present invention simultaneously has good extreme pressure lubrication performance, wetting performance, rust prevention performance, and antioxidant performance. It has good wetting performance and a small contact angle, can spread more evenly on the surface of molding sand and metal to form a uniform isolation lubricating oil film, the mold and the casting are easily separated, the surface of the casting is not corroded, it can meet the requirements of high-quality sand casting release process, will not affect the subsequent casting surface treatment process, the surface of the casting product is smoother and flatter, can reduce the generation of waste water for cleaning the mold and the amount of waste release agent in the waste water, and meets the environmental requirements of energy conservation and environmental protection. Specific embodiments

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this patent in detail and do not limit the protection scope of the present invention in any way.

[0043] The extreme pressure lubrication performance (maximum seizure load PB) is tested according to the test method described in GB / T 3142;

[0044] The rust prevention performance (humidity and heat analysis) is tested according to the test method described in GB / T 2361;

[0045] The antioxidant performance (rotating oxygen bomb) is tested according to the test method described in SH / T 0193;

[0046] The contact angle, which is a related index of the wetting and film-forming performance, is measured by a contact angle meter;

[0047] The emulsification state is tested according to the test method described in SH / T 0579.

[0048] One object of the present invention is to provide a sand casting release oil composition, which comprises the following components in parts by weight:

[0049] a) 0.1 to 1 part of antioxidant;

[0050] b) 0.1 to 5 parts of rust inhibitor;

[0051] c) 1 to 10 parts of oiliness agent;

[0052] d) 60 to 100 parts of base oil.

[0053] According to some embodiments of the present invention, the rust inhibitor comprises alkyl phosphoric acid imidazolium salt and auxiliary rust inhibitor, and the auxiliary rust inhibitor comprises at least one of sodium petroleum sulfonate, phosphate ester and dodecenyl succinic acid; preferably, the ratio of the number of parts of the alkyl phosphoric acid imidazolium salt to the auxiliary rust inhibitor is (0.05 to 2):(0.05 to 3); preferably (0.5 to 1.8):(0.4 to 2.5); more preferably (1 to 1.6):(0.4 to 2);

[0054] And / or, the oiliness agent comprises dodecanol, oleic acid and auxiliary oiliness agent, and the auxiliary oiliness agent comprises at least one of isooctyl palmitate, dioctyl phthalate and trimethylolpropane oleate; preferably, the ratio of the number of parts of dodecanol, oleic acid and auxiliary oiliness agent is (0.3 to 2):(0.3 to 2):(0.4 to 6); preferably, the ratio of the number of parts of dodecanol, oleic acid and auxiliary oiliness agent is (0.5 to 2):(0.5 to 2):(2.5 to 3.5).

[0055] According to some embodiments of the present invention, by weight parts, it comprises the following components:

[0056] a) 0.3 - 0.9 parts of antioxidant, preferably 0.5 - 0.9 parts;

[0057] b) 1 - 4 parts of rust inhibitor, preferably 1.5 - 3 parts;

[0058] c) 2 - 8 parts of oiliness agent, preferably 3 - 6 parts;

[0059] d) 70 - 95 parts of base oil, preferably 90 - 95 parts;

[0060] According to some embodiments of the present invention, the antioxidant comprises alkyl diphenylamine antioxidant and co - antioxidant, and the co - antioxidant is at least one of aromatic amine antioxidant, phenolic ester antioxidant, N - phenyl - α - naphthylamine and dialkyldithiocarbamate; preferably, the co - antioxidant is at least one of N - phenyl - α - naphthylamine and dialkyldithiocarbamate;

[0061] Preferably, the ratio of the number of parts of alkyl diphenylamine antioxidant to co - antioxidant is (0.05 - 1):(0.05 - 1); preferably (0.4 - 0.8):(0.2 - 1).

[0062] And / or, the base oil is selected from at least one of highly refined mineral oil, vegetable oil and synthetic oil.

[0063] According to some embodiments of the present invention, the base oil is selected from at least one of highly refined mineral oil HVIⅡ - 2, 60N, W1 - 60, W1 - 80, W1 - 100 and No. 5 white oil; preferably 60N, W1 - 60 and W1 - 80, optionally highly refined mineral oil HVIⅡ - 2 and W1 - 100;

[0064] Preferably, the ratio of the number of parts of 60N, W1 - 60, W1 - 80 is (20 - 25):(15 - 35):(30 - 50).

[0065] According to some embodiments of the present invention, the maximum non - seizure load PB of the sand - casting release oil composition is not less than 314N;

[0066] And / or, for the 45# steel sheet, under the condition of damp - heat analysis at 49℃ ± 1℃, A - level condition, the rust - proof time is not less than 80h;

[0067] And / or, at 150℃, the rotary oxygen bomb time is not less than 150min, preferably 150 - 500min, more preferably 200 - 300min, further preferably 200 - 280min;

[0068] And / or, the contact angle is less than 20 degrees, preferably less than 15 degrees, more preferably less than 13 degrees.

[0069] A second object is to provide: a preparation method of a sand mold casting release oil composition, including mixing and stirring each component to obtain the sand mold casting release oil composition.

[0070] According to some embodiments of the present invention, the preparation method includes the following steps

[0071] S1. Gradually heat the base oil to 50 - 60 °C under continuous stirring;

[0072] S2. Add the oiliness agent and mix them;

[0073] S3. Add the rust inhibitor and antioxidant, mix, stop heating under continuous stirring, and stop stirring until the temperature drops to room temperature to obtain the sand mold casting release oil composition.

[0074] A third object is to provide: the application of the sand mold casting release oil composition in the sand mold casting release process.

[0075] A sand mold casting release oil composition, its preparation method and application provided by the present invention have been successfully applied. The following is a detailed description in combination with specific examples:

[0076] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. The instruments and equipment used in the following examples can all be obtained through market purchase; the experimental methods are all conventional methods unless otherwise specified.

[0077] According to relevant industry standards, key performance tests such as extreme pressure lubrication performance (maximum non-seizure load PB), rust prevention performance (humidity and heat analysis), antioxidant performance (rotating oxygen bomb), etc. were carried out on the sand mold release oils prepared in each example and comparative example. At the same time, the contact angle project, which is a related index of the oil wetting and film-forming performance, was investigated. The test methods are all well-known to those skilled in the art of engineering. Among them, the lubrication performance evaluation index "maximum non-seizure load PB" is in accordance with the GB / T3142 method. This PB test method uses step-by-step testing, and most of the repeated data in the test results are data of the same step.

[0078]

Examples 1 - 13

[0079] Put the base oil into the blending kettle, stir, heat it to 50 - 60 °C and maintain this temperature; add the oiliness agent and stir evenly; finally add the rust inhibitor and antioxidant, stir and stop heating, gradually cool down to room temperature, and stop stirring to obtain the composition. The types and dosages of each component in the sand mold casting release oil compositions of Examples 1 - 13 are shown in Table 1 specifically.

[0080] Table 1 Component composition and weight parts of Examples 1 to 13

[0081]

[0082]

Comparative Example 1

[0083] Prepare the composition according to the content disclosed in Example 1 of Document CN101010156A. By weight percentage, there are 97.8 parts of solvent, 1 part of high-viscosity mineral oil, 1 part of silicone oil, 0.1 part of rapeseed oil, and 0.1 part of organic molybdenum.

[0084]

Comparative Example 2

[0085] A certain foundry uses a commercially available domestic pure oil type sand mold release oil in the sand mold casting process.

[0086]

Comparative Example 3

[0087] A certain foundry uses a commercially available imported pure oil type sand mold release oil in the sand mold casting process.

[0088]

Comparative Example 4

[0089] A certain foundry uses a commercially available water-based emulsified die casting release agent of a certain brand in the aluminum alloy die casting process.

[0090] Carry out key performance tests such as extreme pressure lubrication performance (maximum non-seizure load PB), rust prevention performance (humidity and heat analysis), antioxidant performance (rotating oxygen bomb), etc. on the sand mold release oils prepared in each example and comparative example according to relevant industry standards. At the same time, the contact angle item, an associated index of the oil wetting and film-forming performance, was investigated. The test methods are well-known to those skilled in the art. Among them, the lubrication performance evaluation index "maximum non-seizure load PB" is in accordance with the method of GB / T3142. This PB test method uses stepped testing, and most of the repeated data in the test results are data of the same step. The test results of Examples 1 to 13 are shown in Table 2. The test results of Comparative Examples 1 to 4 are shown in Table 3.

[0091] Table 2 Test results of Examples 1 to 13

[0092]

[0093] Table 3 Test results of Comparative Examples 1 to 4

[0094]

[0095] Comparing Table 2 and Table 3, it can be seen that the lubricity, rust prevention, antioxidant, and wetting and film-forming properties of the examples in Table 2 are significantly higher than those of the comparative examples.

[0096] Example 1 is different from Examples 5 - 7 in that the components and ratios of the rust inhibitor are different. The rust inhibitor in Example 5 only contains alkyl phosphoric acid imidazole sulfonate. The rust inhibitor in Example 6 is a mixture of two components, sodium petroleum sulfonate and phosphate ester. The rust inhibitor in Example 7 is a mixture of alkyl phosphoric acid imidazole sulfonate and calcium petroleum sulfonate. It can be seen from the data of the damp heat analysis in Table 2 (45# steel sheet, 49°C ± 1°C, Grade A) that the compound rust inhibitor is superior to the single-component rust inhibitor; for the rust inhibitor in the same amount, the compound rust inhibitor containing alkyl phosphoric acid imidazole sulfonate is superior to the compound rust inhibitor without alkyl phosphoric acid imidazole sulfonate.

[0097] Example 1 is different from Examples 8 - 10 in that the components and ratios of the oiliness agent are different. They are all compound oiliness agents. Example 8 does not contain oleic acid. Example 9 does not contain dodecanol. Example 10 does not contain trimethylolpropane oleate, isooctyl palmitate and dioctyl phthalate. Comparing the maximum non-seizure load and contact angle of several groups, Example 1 has five compoundings, and the values of its maximum non-seizure load PB, damp heat analysis (45# steel sheet, 49°C ± 1°C, Grade A), rotating oxygen bomb (150°C) and contact angle are all better than those of Examples 8 - 10. Although Example 10 has two compoundings of oleic acid and dodecanol, its data is better than the four compoundings of Examples 8 and 9. Thus, it can be seen that the compounding of oleic acid and dodecanol has outstanding lubricity and wetting and film-forming properties, but is still lower than the five compoundings of Example 1.

[0098] Example 1 is different from Examples 11 - 13 in that the components and ratios of the antioxidant are different. The rotating oxygen bomb (150°C) of Example 1 is significantly higher than that of Examples 11 - 13.

[0099] The mold release agent of the present invention does not contain organic molybdenum. The use of organic molybdenum will increase the foam of the mold release agent, and the foam is large when the oil product is used, which is likely to cause blockage of the injection nozzle of the mold release machine. In addition, in the actual industrial application of the composition of the present invention, as shown in Examples 1 - 13, the mold release oil has no corrosion on the surface of metal castings, can meet the requirements of the sand mold release process and the surface quality requirements of the castings after demolding, and does not affect the subsequent surface treatment process of the castings. The sand mold casting mold release oil composition of the present invention has good lubricity, rust and corrosion resistance, antioxidant property and mold release property, and has achieved good technical effects.

[0100] It should be noted that the above-described embodiments are only used to explain the present invention and do not constitute any limitation to the present invention. The present invention has been described by referring to the typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words rather than limiting words. Modifications can be made to the present invention within the scope of the claims of the present invention as provided, and the present invention can be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A sand casting release oil composition comprising the following components in parts by weight: a) 0.1 to 1 part antioxidant; b) 0.1 to 5 parts of rust inhibitor; c) 1-10 parts of oiliness agent; d) 60-100 parts of base oil.

2. The mold release oil composition for sand casting according to claim 1, characterized in that, The rust inhibitor comprises an alkyl imidazolium phosphate salt and an auxiliary rust inhibitor, wherein the auxiliary rust inhibitor comprises at least one of sodium petroleum sulfonate, phosphate ester and dodecenylsuccinic acid; preferably, the ratio of the alkyl imidazolium phosphate salt to the auxiliary rust inhibitor is (0.05-2): (0.05-3); preferably (0.5-1.8): (0.4-2.5); more preferably (1-1.6): (0.4-2); And / or, the oiliness agent includes dodecyl alcohol, oleic acid and an auxiliary oiliness agent, and the auxiliary oiliness agent includes at least one of isooctyl palmitate, dioctyl phthalate and trimethylolpropane oleate; preferably, the ratio of dodecyl alcohol, oleic acid and the auxiliary oiliness agent is (0.3-2): (0.3-2): (0.4-6); preferably, the ratio of dodecyl alcohol, oleic acid and the auxiliary oiliness agent is (0.5-2): (0.5-2): (2.5-3.5).

3. The sand casting mold release oil composition according to claim 1 or 2, characterized in that, Calculated by weight, it includes the following components: a) 0.3 to 0.9 parts of antioxidant, preferably 0.5 to 0.9 parts; b) 1 to 4 parts of a rust inhibitor, preferably 1.5 to 3 parts; c) 2 to 8 parts of an oiliness agent, preferably 3 to 6 parts; d) 70 to 95 parts of base oil, preferably 90 to 95 parts.

4. The sand casting release oil composition according to any one of claims 1-3, characterized in that, The antioxidant includes an alkyl diphenylamine antioxidant and an auxiliary antioxidant, wherein the auxiliary antioxidant is at least one of an aromatic amine antioxidant, a phenolic ester antioxidant, N-phenyl-α-naphthylamine and a dialkyl dithiocarbamate; preferably at least one of N-phenyl-α-naphthylamine and a dialkyl dithiocarbamate; Preferably, the ratio of the alkyl diphenylamine antioxidant to the auxiliary antioxidant is (0.05 to 1): (0.05~1); preferably (0.4~0.8): (0.2~1); And / or, the base oil is selected from at least one of deeply refined mineral oil, vegetable oil and synthetic oil.

5. The mold release oil composition for sand casting according to claim 4, wherein The base oil is selected from at least one of deeply refined mineral oil HVIII-2, 60N, W1-60, W1-80, W1-100 and No. 5 white oil; preferably 60N, W1-60 and W1-80, and optionally deeply refined mineral oil HVIII-2 and W1-100; And / or, the ratio of 60N, W1-60 and W1-80 is (20-25): (15-35): (30-50).

6. The sand casting release oil composition according to any one of claims 1-5, characterized in that, The maximum no-seizure load PB of the sand casting release oil composition is not less than 314N; And / or, the rust prevention time of 45# steel sheet shall be no less than 80h under the condition of hygrothermal analysis at 49℃±1℃ and Class A; and / or, at 150° C., the rotating oxygen bomb time is not less than 150 min, preferably 150-500 min, more preferably 200-300 min, and even more preferably 200-280 min; And / or, the contact angle is less than 20 degrees, preferably less than 15 degrees, and more preferably less than 13 degrees.

7. The preparation method of the mold release oil composition for sand casting according to any one of claims 1-6, characterized in that, Comprising: Mixing and stirring each component to obtain the sand casting release oil composition.

8. The preparation method according to claim 7, characterized in that, Comprising the following steps: S1. Gradually heat the base oil to 50-60 °C under continuous stirring; S2. Add an oiliness agent and mix them; S3. Add a rust inhibitor and an antioxidant, mix them, stop heating under continuous stirring, and stop stirring after the temperature drops to room temperature to obtain the sand casting release oil composition.

9. Use of the sand casting release oil composition according to any one of claims 1-6 or the sand casting release oil composition prepared by the preparation method of claims 7 and 8 in the sand casting release process.

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