Biodegradable high-temperature release agent composition and preparation method thereof

Abstract

The invention relates to the field of mold release agents, and particularly discloses a biodegradable high-temperature mold release agent composition and a preparation method of the biodegradable high-temperature mold release agent composition. The release agent composition comprises the following raw materials in parts by weight: 8.5-26.4 parts of pentaerythritol ester, 70-80 parts of vegetable oil, 2-5 parts of a viscosity improver, 0.5-3 parts of an anti-wear reagent at extreme pressure, 1-3 parts of an antioxidant and 0.1-0.5 part of a dispersing agent. The preparation method comprises the following steps: S1, mixing the pentaerythritol ester, the vegetable oil and the viscosity improver, stirring and heating to 60-70 DEG C to obtain a primary mixture; s2, an anti-wear reagent at extreme pressure, an antioxidant and a dispersing agent are added into the primary mixture, stirring continues to be conducted for 30-35 min, then circulation treatment is conducted for 12-18 min, filtering and discharging are conducted, and a finished product release agent is obtained; and meanwhile, the lubricant has the advantages of high temperature resistance, degradability and good lubricating and demolding effects.

Description

Technical Field

[0001] The present application relates to the field of mold release agents, and more specifically, to a biodegradable high-temperature mold release agent composition and a preparation method thereof. Background Art

[0002] A mold release agent is a functional substance between a mold and a finished product; the mold release agent has good chemical resistance, good heat resistance and wear resistance, is not easily decomposed or worn, and is widely used in fields such as injection molding, extrusion, calendering, molding, and lamination.

[0003] In the continuous casting and rolling, hot rolling and cold rolling operations of ferrous and non-ferrous metals, a mold release agent is often required for lubrication and mold release; especially in the continuous casting and rolling process of lead grids for batteries, a mold release agent with high temperature resistance and good lubricating mold release performance is more needed.

[0004] During the preparation process of lead grids, the temperature is relatively high, so the mold release agent is required to have good high temperature resistance. Moreover, during the processing of lead grids, waste materials are easily generated by the mold release agent, which is likely to affect the soil and water bodies.

[0005] Therefore, how to prepare a new mold release agent with the advantages of high temperature resistance, degradability, and good lubricating mold release effect is a problem to be solved. Summary of the Invention

[0006] In order to prepare a new mold release agent with the advantages of high temperature resistance, degradability, and good lubricating mold release effect, the present application provides a biodegradable high-temperature mold release agent composition and a preparation method thereof.

[0007] In the first aspect, the present application provides a biodegradable high-temperature mold release agent composition, adopting the following technical solution: A biodegradable high-temperature mold release agent composition, the mold release agent composition comprises the following raw materials in parts by weight: 8.5 - 26.4 parts of pentaerythritol ester, 70 - 80 parts of vegetable oil, 2 - 5 parts of viscosity improver, 0.5 - 3 parts of extreme pressure and anti-wear agent, 1 - 3 parts of antioxidant, and 0.1 - 0.5 parts of dispersant.

[0008] By adopting the above technical solutions, pentaerythritol ester has multiple ester groups, and the ester groups can remain stable at high temperatures and are not prone to decomposition problems. Moreover, pentaerythritol ester can be mutually compatible and bonded with vegetable oil. Through the interpenetrating effect, the high-temperature stability of the ester groups is improved, enabling the demolding agent to have the advantage of high-temperature resistance. Additionally, pentaerythritol ester has a relatively high melting point, and even at relatively high temperatures, it can still form a stable lubricating film to effectively isolate the mold and the product. In combination with the lubricating substances generated by vegetable oil at high temperatures, as well as the connecting lubricating film layer formed by pentaerythritol ester and vegetable oil, the stability of the lubricating film layer is further enhanced, and the problem of mold adhesion is not prone to occur. The friction coefficient between the mold and the demolded product is reduced, achieving a good demolding effect, thereby enabling the demolding agent composition to have a good lubricating effect at relatively high temperatures.

[0009] Utilizing the biodegradable characteristics of pentaerythritol ester and vegetable oil, the demolding agent has a good biodegradable effect and is not easily environmentally impactful. In combination with antioxidants, the oxidation and decomposition of the demolding agent are further prevented, ensuring the stability of the demolding agent. In combination with viscosity improvers, the demolding agent is not likely to stay on the mold surface and can also ensure the smoothness of demolding. In combination with extreme pressure and anti-wear agents, the wear resistance of the demolding agent can be further improved, reducing friction and wear during the demolding process, ensuring the formation of a more stable and durable lubricating film between the mold and the product, and improving the quality of the product while ensuring the lubricating demolding effect.

[0010] Preferably, the pentaerythritol ester is prepared by the esterification reaction of C7-C14 saturated fatty acids and pentaerythritol, and the kinematic viscosity (40 °C) is 100-150 mm 2 / s, and the flash point ≥ 310 °C.

[0011] By adopting the above technical solutions, the esterification reaction of saturated fatty acids and pentaerythritol is used to prepare pentaerythritol ester with appropriate viscosity, ensuring that the demolding agent can form a stable lubricating film between the product and the mold, guaranteeing smooth demolding while ensuring the integrity and quality of the demolded product. The flash point is greater than 310 °C. Due to the relatively high ester content of pentaerythritol ester, the high thermal stability of pentaerythritol ester is ensured, and the molecular structure can remain stable under high-temperature conditions, not easily decomposing or failing, thereby improving the high-temperature resistance of the demolding agent composition and enabling the demolding agent composition to still have a good lubricating demolding effect even under high-temperature conditions.

[0012] Preferably, the vegetable oil is one or more of soybean oil, sunflower oil, and rapeseed oil; the flash point ≥ 300 °C, and the impurity ≤ 0.1%.

[0013] By adopting the above technical solutions, soybean oil is rich in fatty acids, which have good stability at high temperatures. Therefore, the high-temperature resistance of the demolding agent can be improved. Soybean oil has good lubricating performance and can effectively reduce the friction between the mold and the product, thereby optimizing the demolding process; sunflower oil has a high smoke point and good antioxidant properties, which enables it to maintain stability for a long time in a high-temperature environment. At the same time, the lubricating effect of sunflower oil is also very excellent, which can effectively reduce the resistance during the demolding process; rapeseed oil has a low freezing point and good low-temperature fluidity, which enables it to maintain a good lubricating effect in a low-temperature environment. At the same time, rapeseed oil also has a certain high-temperature resistance, thereby improving the high-temperature resistance of the demolding agent composition.

[0014] Preferably, the viscosity improver is composed of polymethacrylate (PMMA) and polyisobutene (PIB) with a mass ratio of 1:0.5 - 1; the kinematic viscosity (100 °C) is 1000 - 1500 mm 2 / s, and the flash point ≥ 300 °C.

[0015] By adopting the above technical solutions, polymethacrylate can form a uniform lubricating film between the mold and the product. Combining with the longer molecular chain of polyisobutene, polyisobutene has good flexibility and high-temperature resistance characteristics. The formed lubricating film has good stability and good lubricating and friction-reducing performance. Ensuring the integrity of the lubricating film can also effectively reduce the friction resistance during demolding, enabling the product to be removed from the mold more smoothly and ensuring the quality of the demolded product; at the same time, methacrylate has good miscibility with pentaerythritol ester. In a high-temperature environment, polyisobutene can effectively prevent the demolding agent from decomposing or failing, thereby further improving the stability of the demolding agent composition under high-temperature conditions.

[0016] Preferably, the extreme pressure and anti-wear agent adopts one or more of dibutyl phosphite (T304), tricresyl phosphate (T306), thiophosphoric acid amine salt (T307), or triphenyl thiophosphate (T309).

[0017] By adopting the above technical solutions, dibutyl phosphite, tricresyl phosphate, thiophosphoric acid amine salt, and triphenyl thiophosphate utilize their filling and dispersing effects in the demolding agent to improve the wear resistance of the demolding agent, reduce the friction coefficient, and form a protective film to enhance the lubricating demolding effect. And the ester group of dibutyl phosphite, tricresyl phosphate, and triphenyl thiophosphate has a good mixing effect with pentaerythritol ester, making the lubricating film have a high stability, which can not only prevent its oxidation and decomposition but also ensure the demolding uniformity of the demolded product and improve the quality of the demolded product.

[0018] Preferably, the antioxidant adopts any one of phenyl-α-aniline (T531) and diisooctyl diphenylamine (T534).

[0019] By adopting the above technical solution, phenyl-α-aniline and diisooctyl diphenylamine can provide active hydrogen atoms, which can combine with peroxide free radicals to form stable products, thereby interrupting the free radical chain reaction, effectively preventing other components in the mold release agent from deteriorating due to oxidation, maintaining the stability of the mold release agent and extending its service life.

[0020] Preferably, the dispersant is any one of monoalkenyl succinimide (T151), polyalkenyl succinimide (T153), and polyisobutylene succinimide (T154).

[0021] By adopting the above technical solution, monoalkenyl succinimide, polyalkenyl succinimide or polyisobutylene succinimide can prevent the mold release agent from aggregating and depositing, improve the stability and use effect of the mold release agent, ensure the stability and use effect of the mold release agent, and extend the service life of the mold release agent.

[0022] Preferably, the mold release agent composition further comprises 1-3 parts of citric acid fatty acid glycerol complex and 1-2 parts of cetylstearyl alcohol-coated nano silicon nitride particles.

[0023] By adopting the above technical solution, the citric acid fatty acid glycerol complex and the cetylstearyl alcohol-coated nano silicon nitride particles cooperate with each other. The ester group in the citric acid fatty acid glycerol is convenient for connecting with pentaerythritol ester and vegetable oil, and the hydroxyl groups in the citric acid fatty acid glycerol and cetylstearyl alcohol cooperate with the amino groups in monoalkenyl succinimide, polyalkenyl succinimide, and polyisobutylene succinimide to further improve the dispersion uniformity and dispersion stability of the citric acid fatty acid glycerol complex and the nano silicon nitride particles.

[0024] Citric acid fatty acid glycerol, cetylstearyl alcohol, and nano silicon nitride particles have good thermal stability. Combining with the connection effect of citric acid fatty acid glycerol and cetylstearyl alcohol, the structural stability of the mold release agent is further improved, thereby improving the high-temperature resistance of the mold release agent. Citric acid fatty acid glycerol also has certain antioxidant properties when combined with oxidants, preventing the mold release agent from being oxidized and affecting its service life under high-temperature conditions.

[0025] Citric acid fatty acid glycerol and cetylstearyl alcohol cooperate with each other and have good lubricating and dispersing properties. They can form a uniform lubricating film between the mold and the product, reduce friction and wear, and further protect the surface quality of the demolded product in combination with the filling and dispersion effect of nano silicon nitride particles, making it not easy to appear problems such as scratches and defects, and improving the quality of the demolded product.

[0026] Preferably, the citric acid fatty acid glyceride composite material is composed of a citric acid fatty acid glyceride solution and hydroxyapatite nanowires with a mass ratio of 1:0.1-0.3.

[0027] By adopting the above technical solution, the citric acid fatty acid glyceride solution and the hydroxyapatite nanowires are combined. The bonding effect of the citric acid fatty acid glyceride solution is utilized to adhere to the surface of the hydroxyapatite nanowires. By utilizing the flexibility of the hydroxyapatite nanowires, while ensuring the smoothness of demoulding, the quality of the demoulded product is protected, and problems such as scratches and defects are not likely to occur.

[0028] In a second aspect, the present application provides a preparation method for a biodegradable high-temperature demoulding agent composition, adopting the following technical solution: A preparation method for a biodegradable high-temperature demoulding agent composition includes the following steps: S1. Mix pentaerythritol ester, vegetable oil and a viscosity improver, and stir and heat up to 60-70 °C to obtain a preliminary mixture. S2. Add an extreme pressure anti-wear agent, an antioxidant and a dispersant to the preliminary mixture, continue stirring for 30-35 min, then carry out cyclic treatment for 12-18 min, and filter and discharge to obtain the finished demoulding agent.

[0029] By adopting the above technical solution, pentaerythritol ester, vegetable oil and a viscosity improver are mixed at 60-70 °C, so that the preliminary mixture has an appropriate viscosity during the mixing process, and substances such as an anti-wear agent, an antioxidant and a dispersant are added, so that the finished demoulding agent composition has the advantages of good lubricating demoulding effect, good high-temperature stability, antioxidant property and good wear resistance, prolonging the service life of the demoulding agent composition and improving the surface quality of the demoulded product.

[0030] In summary, the present application has the following beneficial effects: 1. Pentaerythritol ester, vegetable oil and a viscosity improver are mixed, so that the preliminary mixture has an appropriate viscosity during the mixing process, and substances such as an anti-wear agent, an antioxidant and a dispersant are added, so that the finished demoulding agent composition has the advantages of good lubricating demoulding effect, good high-temperature stability, antioxidant property and good wear resistance, prolonging the service life of the demoulding agent composition and improving the surface quality of the demoulded product.

[0031] 2. Citric acid fatty acid glyceride, cetearyl alcohol and nano silicon nitride particles have good thermal stability. Combining with the connection effect between citric acid fatty acid glyceride and cetearyl alcohol, the structural stability of the demoulding agent is further improved, thereby improving the high-temperature resistance of the demoulding agent. Citric acid fatty acid glyceride combined with an oxidant also has a certain antioxidant property, preventing the demoulding agent from being oxidized and affecting the service life of the demoulding agent under high-temperature conditions.

[0032] 3. Both citric acid fatty acid glycerides and cetearyl alcohol are soluble in ethanol. After the surface of the demolding product is cleaned with ethanol, it can remove the excess substances on the surface and enable the repeated use of silicon nitride particles and hydroxyapatite nanowires, which has the advantages of environmental protection and sustainable development. Detailed implementation manners

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] Preparation examples of citric acid fatty acid glycerides The following raw materials are all commercially available.

[0035] Preparation example 1: The citric acid fatty acid glycerides were prepared by the following method: The citric acid fatty acid glycerides were placed in ethanol and stirred. After complete dissolution, a 2% by mass citric acid fatty acid glyceride solution was obtained; the mass fraction of ethanol was 99%; 1 kg of the citric acid fatty acid glyceride solution was mixed and stirred evenly with 0.2 kg of hydroxyapatite nanowires to obtain citric acid fatty acid glycerides; the average length of the hydroxyapatite nanowires was 200 nm, and the average diameter was 10 nm.

[0036] Preparation example 2: The difference between this preparation example and preparation example 1 is as follows: The citric acid fatty acid glycerides were placed in ethanol and stirred. After complete dissolution, a 2% by mass citric acid fatty acid glyceride solution was obtained; the mass fraction of ethanol was 99%; 1 kg of the citric acid fatty acid glyceride solution was mixed and stirred evenly with 0.1 kg of hydroxyapatite nanowires to obtain citric acid fatty acid glycerides; the average length of the hydroxyapatite nanowires was 200 nm, and the average diameter was 10 nm.

[0037] Preparation example 3: The difference between this preparation example and preparation example 1 is as follows: The citric acid fatty acid glycerides were placed in ethanol and stirred. After complete dissolution, a 2% by mass citric acid fatty acid glyceride solution was obtained; the mass fraction of ethanol was 99%; 1 kg of the citric acid fatty acid glyceride solution was mixed and stirred evenly with 0.3 kg of hydroxyapatite nanowires to obtain citric acid fatty acid glycerides; the average length of the hydroxyapatite nanowires was 200 nm, and the average diameter was 10 nm.

[0038] Preparation examples of cetearyl alcohol-coated nano-silicon nitride particles The following raw materials are all commercially available.

[0039] Preparation example 4: The cetearyl alcohol-coated nano-silicon nitride particles were prepared by the following method: Mix 1 kg of cetearyl alcohol with 0.5 kg of nano silicon nitride particles and stir evenly. The average particle size of the nano silicon nitride particles is 80 nm. Then heat up to 65 °C, and the cetearyl alcohol gradually melts. Continue to mix and stir for 20 min during the melting process. Then, after drying and dispersing, the finished product is obtained, and the average particle size of the finished product is 80 - 150 nm.

[0040] Preparation Example of Pentaerythritol Ester All the following raw materials are commercially available.

[0041] Preparation Example 5: The pentaerythritol ester was prepared by the following method: Mix 18 kg of pentaerythritol, 82 kg of C12 saturated fatty acid, 0.4 kg of activated carbon and 1 kg of concentrated sulfuric acid and stir. React at 180 °C under a vacuum of -0.04 MPa for 6 h, then under a vacuum of -0.06 MPa at 230 °C for 3 h of vacuum reflux, and finally remove the excess acid; stir at 120 °C under a vacuum of -0.06 MPa for 3 h, cool down to 40 °C and filter out the activated carbon to obtain the pentaerythritol ester. Examples

[0042] All the following raw materials are commercially available.

[0043] Example 1: A biodegradable high-temperature mold release agent composition: 20 kg of pentaerythritol ester, 74 kg of vegetable oil, 3 kg of viscosity improver, 1.2 kg of extreme pressure and anti-wear agent, 1.5 kg of antioxidant, 0.3 kg of dispersant; the pentaerythritol ester is the pentaerythritol ester prepared in Preparation Example 5, with a kinematic viscosity (40 °C) of 100 - 150 mm 2 / s, flash point ≥ 310 °C; the vegetable oil is soybean oil, the soybean oil is first-grade soybean oil, flash point ≥ 300 °C, impurities ≤ 0.1%; the viscosity improver is polyisobutene (PIB), kinematic viscosity (100 °C) is 1000 - 1500 mm 2 / s, flash point ≥ 300 °C; the extreme pressure and anti-wear agent is thiophosphoric acid amine salt (T307); the antioxidant is phenyl-α-aniline (T531); the dispersant is polyalkenyl succinimide (T153); The preparation method is as follows: S1. First, clean all the reaction vessels and preparation tools used, and then dry and set aside; add the pentaerythritol ester, vegetable oil and viscosity improver to the reaction kettle and mix, stir and heat up to 65 °C to obtain a preliminary mixture; S2. Add the extreme pressure and anti-wear agent, antioxidant and dispersant to the preliminary mixture, continue to stir for 30 min, then start the filter for 15 min of circulation treatment. After the circulation time is up, filter and discharge to obtain the finished mold release agent.

[0044] Example 2: The difference between this example and Example 1 is as follows: 8.5 kg of pentaerythritol ester, 70 kg of vegetable oil, 2 kg of viscosity improver, 0.5 kg of extreme pressure and anti-wear agent, 1 kg of antioxidant, 0.1 kg of dispersant; the pentaerythritol ester is the pentaerythritol ester prepared in Preparation Example 5; the vegetable oil is sunflower oil; the viscosity improver is polymethacrylate (PMMA); the extreme pressure and anti-wear agent is dibutyl phosphite (T304); the antioxidant is diisooctyl diphenylamine (T534); the dispersant is monoalkenyl succinimide (T151); The preparation method is as follows: S1. First, clean all the reactors and preparation tools used, and then dry and reserve them; add the pentaerythritol ester, vegetable oil and viscosity improver to the reaction kettle for mixing, and stir and heat up to 60 °C to obtain a preliminary mixture; S2. Add the extreme pressure and anti-wear agent, antioxidant and dispersant to the preliminary mixture, continue stirring for 35 min, then start the filter for cyclic treatment for 12 min. After the cyclic time is up, filter and discharge to obtain the finished product release agent.

[0045] Example 3: The difference between this example and Example 1 is as follows: 26.4 kg of pentaerythritol ester, 80 kg of vegetable oil, 5 kg of viscosity improver, 3 kg of extreme pressure and anti-wear agent, 3 kg of antioxidant, 0.5 kg of dispersant; the pentaerythritol ester is the pentaerythritol ester prepared in Preparation Example 5; the vegetable oil is sunflower oil; the viscosity improver is polymethacrylate (PMMA); the extreme pressure and anti-wear agent is tricresyl phosphate (T306); the antioxidant is diisooctyl diphenylamine (T534); the dispersant is polyisobutylene succinimide (T154); The preparation method is as follows: S1. First, clean all the reactors and preparation tools used, and then dry and reserve them; add the pentaerythritol ester, vegetable oil and viscosity improver to the reaction kettle for mixing, and stir and heat up to 70 °C to obtain a preliminary mixture; S2. Add the extreme pressure and anti-wear agent, antioxidant and dispersant to the preliminary mixture, continue stirring for 30 min, then start the filter for cyclic treatment for 18 min. After the cyclic time is up, filter and discharge to obtain the finished product release agent.

[0046] Example 4: The difference between this example and Example 1 is as follows: The raw materials also include 2 kg of citric acid fatty acid glycerol ester composite prepared in Preparation Example 1 and 1.5 kg of cetylstearyl alcohol-coated nano silicon nitride particles prepared in Preparation Example 4; During the preparation process: S2. Add extreme pressure and anti-wear agents, antioxidants, dispersants, citric acid fatty acid glycerol ester composite, and cetearyl alcohol-coated nano-silicon nitride particles to the premix, continue stirring for 30 min, then start the filter for 15 min of circulation treatment. After the circulation time is up, filter and discharge to obtain the finished product mold release agent.

[0047] Example 5: The difference between this example and Example 4 is that: The raw materials also include 1 kg of the citric acid fatty acid glycerol ester composite prepared in Preparation Example 2 and 1 kg of the cetearyl alcohol-coated nano-silicon nitride particles prepared in Preparation Example 4.

[0048] Example 6: The difference between this example and Example 4 is that: The raw materials also include 3 kg of the citric acid fatty acid glycerol ester composite prepared in Preparation Example 3 and 2 kg of the cetearyl alcohol-coated nano-silicon nitride particles prepared in Preparation Example 4.

[0049] Example 7: The difference between this example and Example 4 is that: In the raw materials, the citric acid fatty acid glycerol ester composite is replaced with hydroxyapatite nanowires of the same mass.

[0050] Example 8: The difference between this example and Example 4 is that: In the raw materials, the citric acid fatty acid glycerol ester composite is replaced with citric acid fatty acid glycerol ester of the same mass.

[0051] Example 9: The difference between this example and Example 4 is that: In the raw materials, the cetearyl alcohol-coated nano-silicon nitride particles are replaced with cetearyl alcohol of the same mass.

[0052] Example 10: The difference between this example and Example 4 is that: In the raw materials, the cetearyl alcohol-coated nano-silicon nitride particles are replaced with nano-silicon nitride particles of the same mass.

[0053] Comparative example Comparative example 1: The difference between this comparative example and Example 1 is that: In the raw materials, pentaerythritol is replaced with pentaerythritol ester of the same mass.

[0054] Performance detection test 1. Viscosity detection Prepare the mold release agent composition by the method of Example 1, detect the kinematic viscosity with reference to GB / T265, and detect the viscosity index with reference to GB / T1995, record the data, record the data.

[0055] 2. Flash point and pour point detection The mold release agent composition was prepared by the method of Example 1. The flash point was detected with reference to GB / T3536, and the pour point was detected with reference to GB / T3535, and the data were recorded.

[0056] 3. Compressive effect detection The mold release agent composition was prepared by the method of Example 1. The maximum non-seizure load was detected with reference to SH / T0204 extreme pressure type (four-ball method), and the data were recorded.

[0057] 4. Density detection The mold release agent composition was prepared by the method of Example 1. The density (15 °C) was detected with reference to GB / T2540, and the data were recorded.

[0058] Table 1 Performance test table 5. High temperature resistance detection The mold release agent compositions were prepared by the methods of Examples 1-7, 10 and Comparative Example 1 respectively. The mold release agent compositions were coated on glass plates and heat-treated at 200 °C for 30 min. The cracking situation of the mold release agent compositions was observed, and the cracking area per unit area was recorded. The larger the cracking area, the worse the high temperature resistance.

[0059] 6. Lubricating and mold release effect detection The mold release agent compositions were prepared by the methods of Examples 1-10 respectively. The mold release agent was coated on the surface of a simulated ingot mold, and then a slider of a simulated ingot was contacted and slid with it under a certain pressure. The friction coefficient between the two was measured and the data were recorded. The lower the friction coefficient, the better the lubricating and mold release effect; and the surface scratch situation was observed, and the scratch area per unit area was recorded. The larger the scratch area, the worse the lubrication effect.

[0060] Table 2 Performance test table (in the table, " / " represents that the corresponding example or comparative example did not detect this item, so there is no data) Combined with Examples 1-3 and Tables 1 and 2, it can be seen that the mold release agent composition prepared in this application has a good mold release and lubrication effect and has good high temperature resistance.

[0061] Combined with Example 1 and Examples 4-6 and Table 2, it can be seen that the mold release agent added with citric acid fatty acid glycerol complex and cetylstearyl alcohol-coated nano-silicon nitride particles has better wear resistance while being able to further improve high temperature resistance and scratch resistance, ensuring the quality of the mold release products.

[0062] Combining Example 4 and Examples 7 - 10 and referring to Table 2, it can be seen that in Example 7, when replacing the citric acid fatty acid glycerol ester composite with hydroxyapatite nanowires of the same mass in the raw materials, compared with Example 4, the cracking area of Example 7 is larger than that of Example 4, and the friction coefficient is greater than that of Example 4. This shows that the addition of citric acid fatty acid glycerol ester can further improve the demoulding lubrication effect of the demoulding agent, and can also improve the high-temperature resistance of the demoulding agent through the miscibility of citric acid fatty acid glycerol ester and pentaerythritol ester.

[0063] In Example 8, when replacing the citric acid fatty acid glycerol ester composite with citric acid fatty acid glycerol ester of the same mass in the raw materials, compared with Example 4, the scratch area of Example 8 is larger than that of Example 4. This shows that the addition of hydroxyapatite nanowires can further improve the lubrication effect of the lubricating film formed by the demoulding agent, and it is not easy to have scratch problems, ensuring the quality of the demoulded product.

[0064] In Example 9, when replacing the cetylstearyl alcohol-coated nano-silicon nitride particles with cetylstearyl alcohol of the same mass in the raw materials, compared with Example 4, the scratch area of Example 9 is larger than that of Example 4. This shows that the addition of nano-silicon nitride particles can further improve the lubrication effect of the lubricating film formed by the demoulding agent, and it is not easy to have scratch problems, ensuring the quality of the demoulded product.

[0065] In Example 10, when replacing the cetylstearyl alcohol-coated nano-silicon nitride particles with nano-silicon nitride particles of the same mass in the raw materials, compared with Example 4, the cracking area of Example 10 is larger than that of Example 4, and the friction coefficient is greater than that of Example 4. This shows that the addition of cetylstearyl alcohol can improve the structural stability of the demoulding agent, ensure the formation of a stable and uniform lubricating film between the mold and the demoulded product, reduce friction and wear, and can also improve the high-temperature resistance effect of the demoulding agent.

[0066] Combining Example 1 and Comparative Example 1 and referring to Table 2, it can be seen that in Comparative Example 1, when replacing pentaerythritol ester with pentaerythritol of the same mass in the raw materials, compared with Example 1, the cracking area of Comparative Example 1 is larger than that of Example 1. This shows that the demoulding agent prepared with pentaerythritol ester has good high-temperature resistance.

[0067] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications without creative contributions to this embodiment after reading this specification, 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 biodegradable high-temperature release agent composition, characterized in that: The release agent composition comprises the following raw materials in parts by weight: 8.5-26.4 parts of pentaerythritol ester, 70-80 parts of vegetable oil, 2-5 parts of viscosity improver, 0.5-3 parts of extreme pressure anti-wear agent, 1-3 parts of antioxidant, and 0.1-0.5 parts of dispersant.

2. A biodegradable high-temperature release agent composition according to claim 1, characterized in that: The pentaerythritol ester is prepared by esterification reaction of C7-C14 saturated fatty acid and pentaerythritol, and has a kinematic viscosity (40°C) of 100-150 mm 2 / s, flash point ≥310℃.

3. A biodegradable high-temperature release agent composition according to claim 1, characterized in that: The vegetable oil is one or more of soybean oil, sunflower oil and rapeseed oil; the flash point is ≥300°C and the impurities are ≤0.1%.

4. A biodegradable high-temperature release agent composition according to claim 1, characterized in that: The viscosity improver is composed of polymethacrylate (PMMA) and polyisobutylene (PIB) in a mass ratio of 1:0.5-1; the kinematic viscosity (100°C) is 1000-1500mm 2 / s, flash point ≥300℃.

5. The biodegradable high-temperature release agent composition according to claim 1, characterized in that: The extreme pressure anti-wear agent is one or more of dibutyl phosphite (T304), tricresyl phosphate (T306), thiophosphate amine salt (T307) or triphenylthiophosphate (T309).

6. The biodegradable high-temperature release agent composition according to claim 1, characterized in that: The antioxidant is any one of phenyl-α-aniline (T531) and diisooctyl diphenylamine (T534).

7. The biodegradable high-temperature release agent composition according to claim 1, characterized in that: The dispersant is any one of monoalkenyl succinimide (T151), polyalkenyl succinimide (T153), and polyisobutylene succinimide (T154).

8. The biodegradable high-temperature release agent composition according to claim 1, characterized in that: The demoulding agent composition also includes 1-3 parts of citric acid fatty acid glyceride composite material and 1-2 parts of cetearyl alcohol coated nano silicon nitride particles.

9. A biodegradable high-temperature release agent composition according to claim 8, characterized in that: The citric acid fatty acid glyceride composite material consists of a citric acid fatty acid glyceride solution and hydroxyapatite nanowires in a mass ratio of 1:0.1-0.

3.

10. A method for preparing a biodegradable high-temperature release agent composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Mix pentaerythritol ester, vegetable oil and viscosity improver, stir and heat to 60-70° C. to obtain a primary mixture; S2. Add extreme pressure anti-wear agent, antioxidant and dispersant to the initial mixture, continue stirring for 30-35 minutes, and then circulate the mixture for 12-18 minutes, filter the material and obtain the finished release agent.

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