Environmentally friendly release agent for aluminum ingot casting and preparation method thereof

Abstract

The present invention relates to the technical field of non-ferrous metal casting, and in particular to an environmentally friendly demoulding agent for aluminum ingot casting and a preparation method thereof. The demoulding agent comprises 45-75 parts of trimethylolpropane stearate, 15-45 parts of synthetic saturated hydrocarbon polymers, 1.5-5 parts of antioxidants, 0.05-5 parts of anti-wear agents, and 0.02-0.2 parts of non-ferrous metal corrosion inhibitors, in parts by weight. The weight ratio of the trimethylolpropane stearate to the synthetic saturated hydrocarbon polymer is (1-5): 1. The demoulding agent of the present invention has excellent wetting, spreading, and permeability, excellent anti-wear performance, high ignition point, low oil smoke, low coking tendency, and excellent hydrolysis resistance, and can greatly reduce the influence of cooling water on demoulding quality, and can also effectively control the pollution of cooling water, and the demoulding agent also has a high biodegradability, can ensure the surface quality of the ingot, improve casting efficiency, and reduce pollution.

Description

Technical Field

[0001] The invention relates to an environmentally friendly demoulding agent for aluminum ingot casting and a preparation method thereof, belonging to the technical field of nonferrous metal casting. Background Art

[0002] Aluminum has the advantages of low density, good ductility, corrosion resistance, easy processing, easy recycling and good economy. Various aluminum alloys are widely used in many fields such as automobiles, aerospace, transportation, electronics, electricity, new energy, food packaging, construction engineering, etc.

[0003] The melting and casting process is the key process from raw aluminum to aluminum alloy. Casting products include flat ingots and round ingots of various specifications. The casting stage is related to the molding of the ingot. The surface quality, organizational structure and mechanical properties after crystallization are directly related to the quality of the ingot. The surface of the ingot is required to be as flat and smooth as possible, reduce or eliminate surface defects such as coarse grain layer segregation nodules, reduce the thickness difference of the ingot, reduce the milling operation, and improve the yield rate of the ingot.

[0004] On the basis of the traditional direct water-cooled semi-continuous casting technology, new casting technologies have been developed and applied, such as Wagstaff's LHC casting technology, Epsilon casting technology, Air-slip casting technology, ARC large rod casting technology, etc.; HYDRO's LPC low-pressure casting technology, GC casting technology, AFM adjustable crystallizer technology, etc. These new casting technologies improve the cooling rate at the start of casting, reduce the liquid cavity height, and adjust the cross-sectional size of the crystallizer before casting to adapt to the casting shrinkage of different specifications and alloys.

[0005] The new aluminum alloy casting system can cast aluminum alloys of various specifications, and can change casting parameters according to the needs of the process. Through the oil-lubricating system and the air-lubricating system, the casting speed can be increased, casting defects can be reduced, and the quality of the ingot can be improved. The new casting system abandons the traditional graphite release agent and instead uses a high-quality oil-based release agent to cooperate with the entire casting process. In the air-lubricating casting and low-pressure casting processes, the requirements for the release agent are more stringent. The new release agent is required to have excellent wettability, spreadability and permeability to prevent crystallizer wear and ensure the quality of ingot molding. The release agent must also have a very high ignition point and excellent thermal oxidation stability to prevent the generation of a large amount of oil smoke and coking and carbon deposition on the surface of the ingot during the casting process. The release agent should also have good biodegradability to protect the health of on-site operators and prevent cooling water pollution. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly demoulding agent for aluminum ingot casting and a preparation method thereof. The demoulding agent has excellent wettability, spreadability and permeability, excellent anti-wear performance, high ignition point, low oil smoke, low coking tendency, and outstanding hydrolysis resistance, and can greatly reduce the influence of cooling water on demoulding quality, and can also effectively control the pollution of cooling water. Moreover, the demoulding agent also has a high biodegradability, can ensure the surface quality of the ingot, improve casting efficiency, and reduce pollution.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: an environmentally friendly release agent for aluminum ingot casting, the release agent comprising trimethylolpropane stearate, a synthetic saturated hydrocarbon polymer, an antioxidant, an anti-wear agent and a non-ferrous metal corrosion inhibitor.

[0008] Furthermore, the release agent includes, by weight, 45-75 parts of trimethylolpropane stearate, 15-45 parts of synthetic saturated hydrocarbon polymer, 1.5-5 parts of antioxidant, 0.05-5 parts of anti-wear agent and 0.02-0.2 parts of non-ferrous metal corrosion inhibitor.

[0009] Furthermore, the weight ratio of the trimethylolpropane stearate to the synthetic saturated hydrocarbon polymer is (1-5):1.

[0010] Furthermore, the trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

[0011] Preferably, the trimethylolpropane stearate is trimethylolpropane triisostearate.

[0012] Furthermore, the synthetic saturated hydrocarbon polymer is at least one of poly-alpha-olefin polymer, Fischer-Tropsch synthesis of petroleum to natural gas to oil, and Fischer-Tropsch synthesis of coal to natural gas to oil.

[0013] Furthermore, the antioxidant, anti-wear agent and non-ferrous metal corrosion inhibitor are all solid additives. The use of solid additives can reduce the impact of the introduction of carrier oil in liquid additives on the formulation system.

[0014] Furthermore, the antioxidant is at least one of a polymer phenol antioxidant, an alkylated aniline antioxidant, an alkylated naphthylamine antioxidant, and a phosphite antioxidant.

[0015] Furthermore, the antioxidant is a combination of a high molecular weight phenol antioxidant, an alkylated aniline antioxidant, and a phosphate antioxidant.

[0016] Furthermore, the anti-wear agent is at least one of a thiophosphate anti-wear agent, an aminocaproic acid molybdenum anti-wear agent, and a thiothione anti-wear agent.

[0017] Furthermore, the non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, and a thiadiazole corrosion inhibitor.

[0018] The present invention also discloses a method for preparing an environmentally friendly release agent for aluminum ingot casting, the preparation method comprising:

[0019] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat and stir until all solid additives are dissolved and stir evenly;

[0020] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0021] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0022] The beneficial effects of the present invention are:

[0023] The release agent of the present invention has excellent wettability, spreadability and permeability, excellent anti-wear performance, high ignition point, low oil smoke, low coking tendency, and excellent hydrolysis resistance, which can greatly reduce the influence of cooling water on the demoulding quality, and can also effectively control the pollution of cooling water. Moreover, the release agent also has a high biodegradability, which can ensure the surface quality of the ingot, improve the casting efficiency, and reduce pollution.

[0024] The trimethylolpropane stearate used in the release agent of the present invention has the characteristics of good low temperature performance, strong antioxidant ability and good wetting performance, and there is a strong hydrogen bond in the trimethylolpropane stearate molecule, which makes its saturated vapor pressure very low and the corresponding boiling point very high. The boiling point of isostearic acid under normal pressure is above 300°C, so its high temperature performance is also very outstanding. The trimethylolpropane isostearate synthesized with isostearic acid as the main raw material has the characteristics of low pour point and condensation point, wide use temperature range, strong thermal stability and antioxidant ability, low evaporation loss, high viscosity index, strong viscosity-temperature characteristic, and high biodegradation rate. It can provide excellent wetting effect in the aluminum ingot casting process, provide excellent wetting spreadability and permeability, improve anti-wear performance, and have high ignition point, low oil smoke, low coking tendency, ensure the surface quality of the ingot, improve casting efficiency, and reduce the waste of aluminum materials in the back-end process. The extremely high biodegradation rate can greatly reduce pollution, alleviate the environmental pressure of the aluminum plant, and reduce carbon emissions. However, in the aluminum casting process, a large amount of cooling water flushing makes the release agent very easy to contact with water, so that trimethylolpropane stearate will be hydrolyzed in this application process, and the isomeric stearic acid produced by hydrolysis will affect the quality of cooling water. Synthetic saturated hydrocarbon polymers have extremely high saturation, so that they have very outstanding structural stability, excellent compatibility with various sealing materials, excellent high and low temperature performance, low evaporation loss, high viscosity index, strong viscosity-temperature characteristics, and are widely used. However, it is not easy to biodegrade, and the higher the viscosity and the higher the ignition point, the worse the biodegradability of synthetic saturated hydrocarbon polymers. The present invention finds that trimethylolpropane stearate and synthetic saturated hydrocarbon polymer combination are selected, and through a suitable ratio relationship, the effects of two compounds can be exerted at the same time, that is, the casting quality can be ensured, and the cooling water pollution and performance degradation caused by stearate can be controlled to the greatest extent, and the overall biodegradability of the formula can also be improved, and finally a release agent with excellent quality is obtained. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below. The present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific embodiments and are not intended to limit the present invention.

[0027] The invention discloses an environmentally friendly demoulding agent for aluminum ingot casting. The demoulding agent comprises trimethylolpropane stearate, a synthetic saturated hydrocarbon polymer, an antioxidant, an anti-wear agent and a non-ferrous metal corrosion inhibitor.

[0028] Specifically, in parts by weight, the release agent includes 45-75 parts of trimethylolpropane stearate, 15-45 parts of synthetic saturated hydrocarbon polymer, 1.5-5 parts of antioxidant, 0.05-5 parts of anti-wear agent and 0.02-0.2 parts of non-ferrous metal corrosion inhibitor.

[0029] Specifically, the weight ratio of the trimethylolpropane stearate to the synthetic saturated hydrocarbon polymer is (1-5):1.

[0030] Specifically, the trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

[0031] Preferably, the trimethylolpropane stearate is trimethylolpropane triisostearate.

[0032] Specifically, the synthetic saturated hydrocarbon polymer is at least one of poly-alpha-olefin polymer, Fischer-Tropsch synthesis of petroleum to natural gas to oil, and Fischer-Tropsch synthesis of coal to natural gas to oil.

[0033] Specifically, the antioxidant, anti-wear agent and non-ferrous metal corrosion inhibitor are all solid additives.

[0034] Specifically, the antioxidant is at least one of a polymer phenol antioxidant, an alkylated aniline antioxidant, an alkylated naphthylamine antioxidant, and a phosphite antioxidant.

[0035] Preferably, the antioxidant is at least one of Irganox L06, Irganox L101, Irganox L107, Irganox L109, Irganox L115, BHT, Irganox L168, VANLUBE SS, VANLUBE 81, and VANLUBE 1202.

[0036] More preferably, the antioxidant is a combination of high molecular weight phenol antioxidants, alkylated aniline antioxidants, and phosphate antioxidants.

[0037] Specifically, the anti-wear agent is at least one of a thiophosphate anti-wear agent, a molybdenum aminocaproate anti-wear agent, and a thiothione anti-wear agent.

[0038] Preferably, the anti-wear agent is at least one of Irgalube TPPT, MOLYVAN A, and VANLUBE829.

[0039] The non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, and a thiadiazole corrosion inhibitor.

[0040] A method for preparing an environmentally friendly release agent for aluminum ingot casting, the preparation method comprising:

[0041] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0042] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0043] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0044] Example 1

[0045] The release agent was prepared according to the formulation in Table 1.

[0046] Table 1 Formula composition of Example 1

[0047]

[0048] The preparation method is:

[0049] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0050] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0051] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size of no more than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0052] Example 2

[0053] The release agent was prepared according to the formulation in Table 2.

[0054] Table 2 Formula composition of Example 2

[0055]

[0056] The preparation method is:

[0057] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0058] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0059] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0060] Example 3

[0061] The release agent was prepared according to the formulation in Table 3.

[0062] Table 3 Formula composition of Example 3

[0063]

[0064] The preparation method is:

[0065] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0066] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0067] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0068] Example 4

[0069] The release agent was prepared according to the formulation in Table 4.

[0070] Table 4 Formula composition of Example 4

[0071]

[0072] The preparation method is:

[0073] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0074] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0075] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0076] Example 5

[0077] The release agent was prepared according to the formulation in Table 5.

[0078] Table 5 Formula composition of Example 5

[0079]

[0080] The preparation method is:

[0081] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0082] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0083] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0084] Example 6

[0085] The release agent was prepared according to the formulation in Table 6.

[0086] Table 6 Formula composition of Example 6

[0087]

[0088] The preparation method is:

[0089] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0090] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0091] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0092] Comparative Example 1

[0093] The release agent was prepared by the same method as in Example 1, except that trimethylolpropane stearate was not added. The specific formula composition is shown in Table 7 below.

[0094] Table 7 Formula composition of comparative example 1

[0095]

[0096] The preparation method is:

[0097] S1. Add synthetic saturated hydrocarbon polymer, antioxidant, anti-wear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0098] S2, continue stirring and cool to room temperature;

[0099] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0100] Comparative Example 2

[0101] The release agent was prepared by the same method as in Example 1, except that no synthetic saturated hydrocarbon base oil was added. The specific formula composition is shown in Table 8 below.

[0102] Table 8 Formula composition of comparative example 2

[0103]

[0104] The preparation method is:

[0105] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0106] S2, continue stirring and cool to room temperature;

[0107] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0108] Comparative Example 3

[0109] The release agent was prepared by the same method as in Example 1, except that the addition amounts of trimethylolpropane stearate and synthetic saturated hydrocarbon base oil were adjusted so that the weight ratio of trimethylolpropane stearate and synthetic saturated hydrocarbon base oil was 8.5:1 (not within the scope of the present invention). The specific formula composition is shown in Table 9 below.

[0110] Table 9 Formula composition of comparative example 3

[0111]

[0112] The preparation method is:

[0113] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0114] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0115] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0116] Comparative Example 4

[0117] The release agent was prepared by the same method as in Example 1, except that the addition amounts of trimethylolpropane stearate and synthetic saturated hydrocarbon base oil were adjusted so that the weight ratio of trimethylolpropane stearate and synthetic saturated hydrocarbon base oil was 0.7:1 (not within the scope of the present invention). The specific formula composition is shown in Table 10 below.

[0118] Table 10 Formula composition of comparative example 4

[0119]

[0120] The preparation method is:

[0121] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0122] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0123] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size of no more than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0124] Comparative Example 5

[0125] The release agent was prepared by the same method as in Example 1, except that the antioxidant was replaced with a conventional liquid additive. The specific formula composition is shown in Table 11 below.

[0126] Table 11 Formula composition of comparative example 5

[0127]

[0128] The preparation method is:

[0129] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0130] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0131] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size of no more than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0132] Comparative Example 6

[0133] The release agent was prepared by the same method as in Example 1, except that the anti-wear agent 7 was replaced with a conventional liquid additive. The specific formula composition is shown in Table 12 below.

[0134] Table 12 Formula composition of comparative example 6

[0135]

[0136] The preparation method is:

[0137] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0138] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0139] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size of no more than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0140] Comparative Example 7

[0141] The release agent was prepared by the same method as in Example 1, except that 7 non-ferrous metal corrosion inhibitors were replaced with conventional liquid additives. The specific formula composition is shown in Table 13 below.

[0142] Table 13 Formula composition of comparative example 7

[0143]

[0144] The preparation method is:

[0145] S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat to 90°C, stir until all solid additives are dissolved, and stir evenly;

[0146] S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform;

[0147] S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size of no more than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

[0148] The release agents prepared in the above examples and comparative examples were tested for performance, and the specific test results are shown in Tables 14 and 15. The test methods involved are:

[0149] Kinematic viscosity: GB / T 265;

[0150] Flash point: GB / T 3536;

[0151] Evaporation loss: refer to SH / T 0059, the test time is 1h, 3h and 10h respectively;

[0152] Coking test (crankcase simulation test method): refer to SH / T 0300, oil temperature 180℃, plate temperature 320℃, time 3h;

[0153] Hydrolysis stability: SH / T 0301;

[0154] Wear scar diameter (four-ball testing machine): ASTM D2266;

[0155] Biodegradation rate: CEC L-33-A-93.

[0156] Table 14 Test data of release agent performance in Examples 1-6

[0157]

[0158] Table 15 Test data of release agent performance in comparative examples 1-7

[0159]

[0160] It can be seen from the above table data that the release agent prepared by the preparation method of the present invention in Examples 1-6 has excellent wetting, spreading and permeability, excellent anti-wear performance, high flash point, low oil smoke and low coking tendency, and the release agent also has a high biodegradability, which can ensure the surface quality of the ingot, improve casting efficiency and reduce pollution. In summary, the environmentally friendly release agent for aluminum ingot casting provided by the present invention and its preparation method have the following advantages:

[0161] 1. Excellent wetting, spreading and permeability, excellent wear resistance;

[0162] 2. It has high ignition point, low smoke and low coking tendency;

[0163] 3. Excellent anti-hydrolysis ability can greatly reduce the impact of cooling water on demoulding quality, and can also effectively control the pollution of cooling water;

[0164] 4. It has a high biodegradability rate, which can ensure the surface quality of the ingot, improve casting efficiency and reduce pollution.

[0165] In addition, from the comparison of the data of Example 1 and Example 6, it can be seen that if the antioxidant is a combination of a high molecular weight phenol antioxidant, an alkylated aniline antioxidant, and a phosphate antioxidant, the release agent has a higher ignition point, lower evaporation loss, lower coking tendency, better hydrolysis resistance, and performance.

[0166] From the data comparison of Example 1 and Comparative Example 1, it can be seen that if trimethylolpropane stearate is not added to the formula composition, the system will appear hazy and not bright, which is because the polarity of the synthetic saturated hydrocarbon polymer is too weak and the solubility of the additive is poor. The ignition point is greatly reduced, the evaporation loss is greatly increased, and the coking amount is also greatly increased, which will seriously affect the surface quality of the aluminum ingot and the environmental safety on site.

[0167] From the data comparison of Example 1 and Comparative Example 2, it can be seen that if the synthetic saturated hydrocarbon polymer is not added to the formula composition, the hydrolysis resistance will be greatly reduced, which will lead to mutual contamination between the release agent and the cooling water, further causing the release agent to fail and environmental risks on site.

[0168] From the data comparison of Example 1 and Comparative Examples 3-4, it can be seen that if the ratio of the amount of synthetic saturated hydrocarbon polymer to trimethylolpropane stearate in the formula composition is not within the specified range of the present invention, the comprehensive performance will not match, and there will be insufficient evaporation loss, coking amount and hydrolysis resistance.

[0169] From the data comparison of Example 1 and Comparative Examples 5-7, it can be seen that if the functional additive is in liquid form, it will lead to a lower flash point, increased evaporation loss, and increased coking amount, because the liquid additive contains carriers such as mineral oil and solvent oil, the introduction of which will affect the performance of the entire system.

[0170] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0171] For those skilled in the art, several modifications and improvements may be made without departing from the concept of the present invention, all of which belong to the protection scope of the present invention. The protection scope of the present invention shall be based on the attached claims.

Claims

1. An environmentally friendly release agent for aluminum ingot casting, characterized in that: In terms of weight, the release agent includes 45-75 parts of trimethylolpropane stearate, 15-45 parts of synthetic saturated hydrocarbon polymer, 1.5-5 parts of antioxidant, 0.05-5 parts of anti-wear agent and 0.02-0.2 parts of non-ferrous metal corrosion inhibitor; The weight ratio of the trimethylolpropane stearate to the synthetic saturated hydrocarbon polymer is (1-5): 1; The synthetic saturated hydrocarbon polymer is at least one of a poly-alpha olefin polymer, a Fischer-Tropsch synthesis of petroleum to natural gas to oil, and a Fischer-Tropsch synthesis of coal to natural gas to oil.

2. The environmentally friendly release agent for aluminum ingot casting according to claim 1, characterized in that: The trimethylolpropane stearate is at least one of trimethylolpropane triisostearate, trimethylolpropane diisostearate monooleate and trimethylolpropane monoisostearate dioleate.

3. The environmentally friendly release agent for aluminum ingot casting according to claim 1, characterized in that: The antioxidant, anti-wear agent and non-ferrous metal corrosion inhibitor are all solid additives.

4. The environmentally friendly release agent for aluminum ingot casting according to claim 1, characterized in that: The antioxidant is at least one of a polymer phenol antioxidant, an alkylated aniline antioxidant, an alkylated naphthylamine antioxidant, and a phosphite antioxidant.

5. The environmentally friendly release agent for aluminum ingot casting according to claim 4, characterized in that: The antioxidant is a combination of high molecular weight phenol antioxidant, alkylated aniline antioxidant and phosphate antioxidant.

6. The environmentally friendly release agent for aluminum ingot casting according to claim 1, characterized in that: The anti-wear agent is at least one of a thiophosphate anti-wear agent, an aminocaproic acid molybdenum anti-wear agent, and a thiothione anti-wear agent; The non-ferrous metal corrosion inhibitor is at least one of a benzotriazole corrosion inhibitor, a methylbenzotriazole corrosion inhibitor, and a thiadiazole corrosion inhibitor.

7. The method for preparing an environmentally friendly release agent for aluminum ingot casting according to any one of claims 1 to 6, characterized in that: The preparation method is: S1. Add trimethylolpropane stearate, antioxidant, antiwear agent and non-ferrous metal corrosion inhibitor into a blending kettle, heat and stir until all solid additives are dissolved and stir evenly; S2, continue stirring, cool to room temperature, add synthetic saturated hydrocarbon polymer, and continue stirring until the mixture is uniform; S3. After the blending is completed, the mixture is filtered using a filter bag with a pore size not greater than 15 μm to obtain the environmentally friendly release agent for aluminum ingot casting.

Images