A durable anti-corrosion mold release agent and its preparation method

Abstract

This application relates to the field of mold release agents, more specifically, to a durable, corrosion-resistant mold release agent and its preparation method. The durable, corrosion-resistant mold release agent comprises the following materials in parts by weight: 45-50 parts wax; 5-25 parts emulsifier; 0.1-0.5 parts preservative; 0.5-1.5 parts antioxidant; 0.5-2.5 parts sodium nitrite; and 15-25 parts deionized water. The wax comprises calcium stearate and paraffin wax in a mass ratio of (1.2-2.5):(12.3-15.6). This application utilizes a compound of calcium stearate and paraffin wax. Due to its amphiphilic structure, calcium stearate effectively lubricates metal surfaces, resulting in excellent mold release. Furthermore, by effectively inserting paraffin wax molecules into the slip layer formed between calcium stearate molecules, the paraffin wax and calcium stearate form a good synergistic effect, further improving the external lubrication properties of calcium stearate.

Description

Technical Field

[0001] The present application relates to the field of release agents, and more specifically, to a durable and corrosion-resistant release agent and a preparation method thereof. Background Art

[0002] Die-casting release agents are designed for specialized molding processes. They serve as auxiliary agents in the production of metal die-cast products. Their primary function is to facilitate smooth removal of metal die-cast products from the mold while maintaining their integrity and post-processability. Release agents can be categorized by performance characteristics into oil-based, water-based, and powder-based release agents.

[0003] Water-based release agents have the advantages of good cooling effect, no accumulation, good casting surface quality, helping to reduce internal porosity, and being safe, environmentally friendly and pollution-free. They are widely used in the production of alloy products.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the existing water-based release agents contain materials that are corrosive to alloys and have the problem of poor stability. Summary of the Invention

[0005] In order to overcome the defects of poor durability and corrosion resistance of durable anti-corrosion release agents, the present application provides a durable anti-corrosion release agent and a preparation method thereof, which adopts the following technical solutions:

[0006] In the first aspect, the present application provides a durable anti-corrosion release agent, which adopts the following technical solution:

[0007] A durable anti-corrosion release agent comprises the following substances in parts by weight: 45 to 50 parts of wax;

[0008] 5-25 parts of emulsifier;

[0009] 0.1-0.5 parts of preservatives;

[0010] 0.5-1.5 parts of antioxidant;

[0011] 0.5-2.5 parts of sodium nitrite;

[0012] 15-25 parts of deionized water;

[0013] The wax comprises calcium stearate and paraffin in a mass ratio of (1.2-2.5): (12.3-15.6).

[0014] By adopting the above technical solution, the technical solution of the present application selects calcium stearate and paraffin for compounding. Since calcium stearate has an amphiphilic molecular structure, it can effectively act on the metal surface and form lubrication, thereby achieving a good demolding effect. Furthermore, the present application further improves the external lubrication performance of calcium stearate by effectively inserting paraffin molecules into the slip layer formed between calcium stearate molecules, and forming a good combination of paraffin and calcium stearate.

[0015] Furthermore, the wax also includes polyethylene wax, and the mass of the polyethylene wax is 1 / 6 of the mass of the paraffin wax.

[0016] By adopting the above technical solution, the technical solution of the present application further optimizes the composition of the wax, and by further selecting polyethylene wax with small particle size and good dispersibility for addition, since polyethylene wax has poor adhesion when used alone as a release agent material, the present application uses a compounded technical solution, which can not only improve the dispersion performance of the wax in the release agent, but also improve the residence time of the wax on the metal surface, thereby improving the durability of the release agent material.

[0017] Furthermore, the paraffin is a modified chlorinated paraffin, and the modified chlorinated paraffin is prepared by the following scheme:

[0018] The chlorinated paraffin is prepared by mixing epoxidized soybean oil and chlorinated paraffin, adding hydroxystearic acid, barium petroleum sulfonate, aluminum hydroxide and deionized water, stirring and mixing, keeping warm for reaction and then cooling.

[0019] By adopting the above-mentioned technical solution, this application uses chlorinated paraffin as the primary wax. Because chlorinated paraffin can corrode metal surfaces, this application modifies it by using epoxidized soybean oil to absorb and bind the free chlorine in the chlorinated paraffin, converting it into hydroxychlorinated vegetable oil and polyether. Therefore, when the release agent is used, the absorbed chlorine is converted into a protective film containing iron chloride, which adheres to the friction surface, thereby improving the release agent's durability and corrosion resistance.

[0020] Furthermore, the emulsifier is a high temperature resistant emulsifier, and the high temperature resistant emulsifier includes oleic acid grafted maleic anhydride.

[0021] Furthermore, the oleic acid grafted maleic anhydride is prepared by the following scheme:

[0022] Take oleic acid and triethylenediamine, stir and mix, heat in an oil bath, let stand and cool, add maleic anhydride, keep warm for reaction, let stand and cool to room temperature, and the high temperature resistant emulsifier can be prepared.

[0023] By adopting the above technical solution, the present application improves the high temperature resistance of the emulsifier material by treating the maleic anhydride grafted oleic acid, so that it maintains good emulsification performance in a high temperature environment, thereby further improving the temperature resistance and stability of the release agent.

[0024] Furthermore, the durable anti-corrosion release agent further comprises 15 to 20 parts by weight of an anti-corrosion protective agent.

[0025] Furthermore, the corrosion resistant protective agent includes a mixture of graphene and lauric acid mixed in a mass ratio of 0.1-0.3:3-6.

[0026] By adopting the above technical solution, the present application selects graphene and lauric acid for mixing, and lauric acid can further form a coating layer on the metal surface. At the same time, graphene can further improve the contact angle of the film formed by lauric acid on the metal surface, making it more hydrophobic, thereby improving the durability of demolding.

[0027] In a second aspect, the present application provides a method for preparing a durable anti-corrosion release agent, comprising the following preparation steps:

[0028] S1. Place wax in a reactor, heat it, add an emulsifier, and stir to prepare an oil phase;

[0029] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0030] S3. Take the mixed liquid, the corrosion protection agent, the preservative, the antioxidant and sodium nitrite, stir and mix, and filter to prepare the durable corrosion-resistant release agent.

[0031] By adopting the above technical solution, since the present application optimizes the preparation method of a durable and corrosion-resistant release agent, by mixing different materials in order, the prepared release agent has good dispersion properties, thereby further improving its stability and durability.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] First, the technical solution of this application uses calcium stearate and paraffin wax for compounding. Because calcium stearate has an amphiphilic molecular structure, it can effectively act on the metal surface and form lubrication, thereby achieving a good demolding effect. Furthermore, this application further improves the external lubrication performance of calcium stearate by effectively inserting paraffin wax molecules into the slip layer formed between calcium stearate molecules, through the good combination of paraffin wax and calcium stearate.

[0034] Second, this application's technical solution uses chlorinated paraffin as the primary wax. Because chlorinated paraffin is corrosive to metal surfaces, this solution modifies it by using epoxidized soybean oil to absorb and bind the free chlorine in the chlorinated paraffin, converting it into hydroxychlorinated vegetable oil and polyether. Consequently, when the release agent is used, the absorbed chlorine is converted into a protective film containing iron chloride, which adheres to the friction surface, thereby improving the release agent's durability and corrosion resistance.

[0035] Third, by mixing graphene and lauric acid, the present application can further form a coating layer on the metal surface. At the same time, graphene can further improve the contact angle of the film formed by lauric acid on the metal surface, making it more hydrophobic, thereby improving the durability of demolding.

[0036] Fourth, the present application optimizes the preparation method of a durable and corrosion-resistant release agent. By mixing different materials in order, the prepared release agent has good dispersion properties, thereby further improving its stability and durability. DETAILED DESCRIPTION

[0037] The present application is further described in detail below with reference to the embodiments.

[0038] Preparation Example

[0039] Preparation Example 1

[0040] Modified chlorinated paraffin: 600 g of epoxidized soybean oil and 400 g of chlorinated paraffin were stirred and mixed, and then 20 g of hydroxystearic acid, 20 g of barium petroleum sulfonate, 0.2 g of aluminum hydroxide and 1000 mL of deionized water were added. The mixture was stirred and mixed, and the mixture was kept warm for reaction and then cooled to prepare the modified chlorinated paraffin.

[0041] Preparation Example 2

[0042] Wax 1:

[0043] Calcium stearate and modified chlorinated paraffin were stirred and mixed in a mass ratio of 1.2:12.3 to prepare wax 1.

[0044] Preparation Example 3

[0045] Wax 2:

[0046] Calcium stearate and modified chlorinated paraffin were stirred and mixed in a mass ratio of 2:13.4 to prepare wax 2.

[0047] Preparation Example 4

[0048] Wax 3:

[0049] Calcium stearate and modified chlorinated paraffin were stirred and mixed in a mass ratio of 2.5:15.6 to prepare wax 3.

[0050] Preparation Example 5

[0051] Wax 4:

[0052] Calcium stearate and modified chlorinated paraffin were stirred and mixed in a mass ratio of 2:13.4, and then polyethylene wax in an amount of 1 / 6 of the mass of the modified chlorinated paraffin was added and stirred and mixed to prepare wax 4.

[0053] Preparation Example 6

[0054] High-temperature resistant emulsifier: Take 20g of oleic acid and 50g of triethylenediamine, stir and mix, place in an oil bath at 160°C, let it stand and cool, add 8g of maleic anhydride, continue to keep the reaction at 220°C, and then let it stand and cool to room temperature to prepare the high-temperature resistant emulsifier.

[0055] Preparation Example 7

[0056] Corrosion protection agent 1: a mixture of graphene and lauric acid in a mass ratio of 0.1:3.

[0057] Preparation Example 8

[0058] Corrosion protection agent 2: a mixture of graphene and lauric acid in a mass ratio of 0.2:4.

[0059] Preparation Example 9

[0060] Corrosion protection agent 3: a mixture of graphene and lauric acid in a mass ratio of 0.3:6. Example

[0061] Example 1

[0062] A durable anti-corrosion release agent comprising:

[0063] 45kg wax 1, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite and 15kg deionized water;

[0064] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0065] S1. Place wax 1 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0066] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0067] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0068] Example 2

[0069] A durable anti-corrosion release agent comprising:

[0070] 47kg wax 1, 13kg high temperature resistant emulsifier, 0.3kg preservative, 1.0kg antioxidant, 1.5kg sodium nitrite and 20kg deionized water;

[0071] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0072] S1. Place wax 1 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0073] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0074] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0075] Example 3

[0076] A durable anti-corrosion release agent comprising:

[0077] 50kg wax 1, 25kg high temperature resistant emulsifier, 0.5kg preservative, 1.5kg antioxidant, 2.5kg sodium nitrite and 25kg deionized water;

[0078] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0079] S1. Place wax 1 in a reactor, heat at 85°C, add an emulsifier, and stir to prepare an oil phase;

[0080] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0081] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0082] Example 4

[0083] A durable anti-corrosion release agent comprising:

[0084] 45kg wax 2, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite and 15kg deionized water;

[0085] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0086] S1. Place wax 2 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0087] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0088] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0089] Example 5

[0090] A durable anti-corrosion release agent comprising:

[0091] 45kg wax 3, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite and 15kg deionized water;

[0092] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0093] S1. Place wax 3 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0094] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0095] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0096] Example 6

[0097] A durable anti-corrosion release agent comprising:

[0098] 45kg wax 4, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite and 15kg deionized water;

[0099] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0100] S1. Place wax 4 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0101] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0102] S3. Take the mixed solution, preservative ZB6061, antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable anti-corrosion release agent.

[0103] Example 7

[0104] A durable anti-corrosion release agent comprising:

[0105] 45kg wax 4, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite, 15kg corrosion protection agent and 15kg deionized water;

[0106] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0107] S1. Place wax 4 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0108] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0109] S3. Take the mixed liquid, the preservative ZB6061, the corrosion protection agent, the antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable corrosion-resistant release agent.

[0110] Example 8

[0111] A durable anti-corrosion release agent comprising:

[0112] 45kg wax 4, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite, 17kg corrosion protection agent and 15kg deionized water;

[0113] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0114] S1. Place wax 4 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0115] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0116] S3. Take the mixed liquid, the preservative ZB6061, the corrosion protection agent, the antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable corrosion-resistant release agent.

[0117] Example 9

[0118] A durable anti-corrosion release agent comprising:

[0119] 45kg wax 4, 5kg high temperature resistant emulsifier, 0.1kg preservative, 0.5kg antioxidant, 0.5kg sodium nitrite, 20kg corrosion protection agent and 15kg deionized water;

[0120] A method for preparing a durable anti-corrosion release agent comprises the following steps:

[0121] S1. Place wax 4 in a reactor, heat at 80°C, add an emulsifier, and stir to prepare an oil phase;

[0122] S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution;

[0123] S3. Take the mixed liquid, the preservative ZB6061, the corrosion protection agent, the antioxidant boron nitride and sodium nitrite, stir and mix, and filter to prepare the durable corrosion-resistant release agent.

[0124] Comparative Example

[0125] Comparative Example 1

[0126] A release agent. Compared with Example 1, paraffin is added in this comparative example instead of wax 1.

[0127] Performance testing

[0128] The release agents prepared in Examples 1 to 9 and Comparative Example 1 were respectively tested for corrosion resistance.

[0129] Detection method / test method

[0130] Test steps:

[0131] Accurately weigh the polished aluminum alloy sheet, then immerse it in the release agent sample solution and maintain it at 70°C for 24 hours. Remove it, rinse it, dry it, and weigh it. Calculate the corrosion rate using the following formula: Where: V is the metal corrosion rate (g / m 2 h), M0 is the weight of the metal sheet, M1 is the weight after removing the corrosion products, s is the surface area of the metal sheet, and t is the corrosion time of the metal sheet. The metal corrosivity is graded as follows:

[0132] Table 1 Metal Corrosion Classification

[0133]

[0134] Durability: The release agent prepared above was placed at 30°C and the delamination time (months) was observed.

[0135] The specific test results are shown in Table 2 below:

[0136] Table 2 Durable corrosion performance

[0137]

[0138] Referring to the performance test comparison in Table 1, we can find that:

[0139] The performance comparison of Examples 1 to 6 and Comparative Example 1 illustrates that the present application utilizes calcium stearate and paraffin wax for compounding. Due to its amphiphilic molecular structure, calcium stearate can effectively act on metal surfaces and lubricate them, thereby achieving a good demolding effect. Furthermore, the present application further improves the external lubrication properties of calcium stearate by effectively inserting paraffin wax molecules into the slip layer formed between calcium stearate molecules, thereby achieving a good combination of paraffin wax and calcium stearate.

[0140] Secondly, this application's technical solution uses chlorinated paraffin as the primary wax. Because chlorinated paraffin can corrode metal surfaces, this solution modifies it by using epoxidized soybean oil to absorb and bind the free chlorine in the chlorinated paraffin, converting it into hydroxychlorinated vegetable oil and polyether. Therefore, when the release agent is used, the absorbed chlorine is converted into a protective film containing iron chloride, which adheres to the friction surface, thereby improving the release agent's durability and corrosion resistance.

[0141] Comparing the performance of Examples 7 to 9 with that of Examples 1 to 3 shows that the present application uses a mixture of graphene and lauric acid. Lauric acid can further form a coating layer on the metal surface. At the same time, graphene can further improve the contact angle of the film formed by lauric acid on the metal surface, making it more hydrophobic, thereby improving the durability of demolding.

[0142] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A durable anti-corrosion release agent, characterized in that: Includes the following materials in parts by weight: 45-50 parts of wax; 5-25 parts of emulsifier; 0.1-0.5 parts of preservatives; 0.5-1.5 parts of antioxidant; 0.5-2.5 parts of sodium nitrite; 15-25 parts of deionized water; The wax comprises calcium stearate and paraffin wax in a mass ratio of (1.2-2.5): (12.3-15.6); the wax further comprises polyethylene wax, the mass of the polyethylene wax being 1 / 6 of the mass of the paraffin wax; the paraffin wax is modified chlorinated paraffin, and the modified chlorinated paraffin is prepared by the following scheme: The chlorinated paraffin is prepared by mixing epoxidized soybean oil and chlorinated paraffin, adding hydroxystearic acid, barium petroleum sulfonate, aluminum hydroxide and deionized water, stirring and mixing, keeping the mixture warm for reaction and then cooling. The durable anti-corrosion release agent further comprises 15 to 20 parts by weight of an anti-corrosion protective agent.

2. A durable anti-corrosion release agent according to claim 1, characterized in that: The emulsifier is a high temperature resistant emulsifier, and the high temperature resistant emulsifier comprises oleic acid grafted maleic anhydride.

3. A durable anti-corrosion release agent according to claim 2, characterized in that: The oleic acid grafted maleic anhydride is prepared by the following scheme: Take oleic acid and triethylenediamine, stir and mix, heat in an oil bath, let stand and cool, add maleic anhydride, keep warm for reaction, let stand and cool to room temperature, and the high temperature resistant emulsifier can be prepared.

4. A durable anti-corrosion release agent according to claim 1, characterized in that: The corrosion resistant protective agent comprises a mixture of graphene and lauric acid mixed in a mass ratio of 0.1-0.3:3-6.

5. The method for preparing the durable anti-corrosion release agent according to any one of claims 1 to 4, comprising the following steps: S1. Place wax in a reactor, heat it, add an emulsifier, and stir to prepare an oil phase; S2, taking the oil phase and deionized water, stirring and mixing, and keeping warm to react to prepare a mixed solution; S3. Take the mixed liquid, the corrosion protection agent, the preservative, the antioxidant and sodium nitrite, stir and mix, and filter to prepare the durable corrosion-resistant release agent.

Images