Preparation method of release film capable of being cured at low temperature and having high wettability for MLCC casting

Abstract

The invention relates to the technical field of release films, and particularly provides a preparation method of a low-temperature-curable and high-wettability release film for MLCC (multilayer ceramic capacitor) tape casting. The release film comprises a base material layer and a release agent layer, the release agent layer is prepared from the following raw materials in percentage by weight: 30%-40% of methylbenzene, 10%-15% of ethyl acetate, 20%-35% of butanone, 10%-20% of organic silicon modified acrylic resin, 2%-3% of a curing agent and 1%-2% of a flatting agent, and the organic silicon modified acrylic resin is prepared from fluoropropenyl trimethoxy silane modified acrylic resin. The surface flatness and wettability of the release film obtained by adopting the scheme are equivalent to those of an imported MLCC release film, and the cost of the release film is far lower than that of the imported MLCC release film.

Description

Technical Field

[0001] The present invention relates to the technical field of release films, and in particular to a method for preparing a release film for MLCC casting that can be cured at low temperature and has high wettability. Background Art

[0002] At present, my country still has a demand for MLCC imports, and the MLCC release films used are also mainly dependent on imports. In terms of imports and exports, according to data, in 2022, my country's MLCC imports will be 2.13 trillion pieces, with an import value of 46.62 billion yuan, and exports will be 1.26 trillion pieces, with an export value of 24.26 billion yuan. The scale of imports is much larger than that of exports.

[0003] MLCC release film is used in the tape casting step in the MLCC process. The area of ​​release film consumed in the production of a single-layer MLCC is roughly equivalent to the area of ​​MLCC. According to data from the China Electronic Components Industry Association and the China Economic Industry Research Institute, the global demand for MLCC release film is expected to be 10.5 billion square meters in 2021, and the market size of MLCC release film is about 20 billion yuan. By 2025, the demand will reach 12 billion square meters.

[0004] At present, the release films used for high-end MLCC are mostly imported from Japan and South Korea. The thickness of high-end MLCC ceramic films is mostly within 2μm, and the requirements for the flatness and wettability of the release films are extremely high. Domestic MLCC release films are limited by the curing temperature of the release agent and often have poor flatness. At the same time, because the wettability of domestic MLCC release films is generally poor, when casting ceramic films below 2μm, the thickness of the ceramic films is uneven, causing the stacking to tilt and poor electrical performance after sintering.

[0005] Based on the above situation, the present invention provides a low-temperature curable, highly wettable release film for MLCC casting, which can effectively solve the above problems. Summary of the invention

[0006] In view of this, the present invention proposes a method for preparing a release film for MLCC casting that can be cured at low temperature and has high wettability.

[0007] The technical solution of the present invention is implemented as follows: The present invention provides a low-temperature curable, high-wettability release film for MLCC casting, the release film comprising a substrate layer and a release agent layer, the raw materials of the release agent layer are made of the following raw materials in weight percentage: 30-40% toluene, 10-15% ethyl acetate, 20-35% butanone, 10-20% silicone-modified acrylic resin, 2-3% curing agent, and 1-2% leveling agent.

[0008] In some embodiments, the preparation method of the organosilicon-modified acrylic resin includes mixing butyl acrylate and ethyl acrylate and standing for 20-40 minutes, adding fluoropropylene trimethoxy silane, stirring evenly, adding initiator benzoyl peroxide, heating to 60-70° C., and keeping the mixture warm for 2-4 hours to obtain the organosilicon-modified acrylic resin.

[0009] In some embodiments, the weight average molecular weight of the prepared silicone-modified acrylic resin is 14,000-16,000.

[0010] In some embodiments, the mass ratio of butyl acrylate:ethyl acrylate:fluoropropylenetrimethoxysilane:benzoyl peroxide is 30:(15-25):(4-6):(1-3).

[0011] In some embodiments, the curing agent is an amino curing agent, such as Cymel 303.

[0012] In some embodiments, the leveling agent is a polyether leveling agent, such as BYK-307 or BYK-308.

[0013] In some embodiments, the substrate layer is a PET film.

[0014] In some embodiments, the roughness Sa of the substrate layer is 8-12 nm.

[0015] In some embodiments, the substrate layer has a thickness of 25-30 μm.

[0016] In some embodiments, the release agent layer has a thickness of 0.02-0.04 μm.

[0017] In a second aspect, the present invention further provides a method for preparing the above-mentioned release film, comprising the following steps:

[0018] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent are mixed and stirred in proportion to obtain a release agent, the release agent is coated on the surface of the substrate layer, and heated and cured to obtain a release film.

[0019] In some embodiments, the heating temperature is 70-90° C. and the heating time is 10-20 s.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Compared with the existing domestic MLCC release films, the low-temperature curable and highly wettable MLCC casting release film of the present invention has a lower curing temperature and higher wettability. After PET is coated and released, it is not easy to deform under low-temperature curing and is more flat; higher wettability will make the leveling of the ceramic slurry better, so that when casting a ceramic film below 2μm, the thickness uniformity of the ceramic film is better; at the same time, a lower curing temperature also means lower energy consumption, thereby reducing production costs. The most important point is that its surface flatness and wettability are comparable to those of imported MLCC release films, and the cost is much lower than that of imported MLCC release films. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the embodiments of the present invention belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this section take precedence over the definitions incorporated herein by reference.

[0024] Unless otherwise specified, the methods used in the following examples are all conventional methods. Unless otherwise specified, the materials, reagents and instruments used are all conventional materials, reagents and instruments in the art, and can be obtained by those skilled in the art through commercial channels.

[0025] When an amount, concentration or other value or parameter is expressed as a range, a preferred range or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including the range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range. In the present specification and claims, range definitions can be combined and / or interchanged, and if not otherwise stated, these ranges include all subranges contained therein.

[0026] Traditional release films usually require high-temperature curing, which may cause deformation of the substrate, thus affecting the flatness of the release film. Insufficient wettability will cause uneven flow of the ceramic slurry on the film surface, resulting in inconsistent thickness. The slurry cannot wet the surface of the film well, causing bubbles or stacking tilt during the casting process. Furthermore, when the surface roughness of the release film increases, it will also affect the uniformity and electrical properties of the ceramic film. These problems will eventually lead to a decrease in the electrical properties of the sintered ceramic film, affecting the reliability and performance of the MLCC.

[0027] The present invention adopts more preferred materials and proportions, reduces the surface roughness of the release film, ensures a smooth surface, thereby improving the leveling of the ceramic film and avoiding the problem of poor electrical performance after sintering. In addition, the release film of the present invention is designed to be cured at a relatively low temperature, effectively reducing the deformation problem of the substrate, maintaining the flatness of the film, reducing the energy consumption of the production process, and improving the stability of the film.

[0028] Example 1

[0029] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 35% toluene, 15% ethyl acetate, 30% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0030] The preparation method of silicone modified acrylic resin is as follows:

[0031] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0032] The preparation method of the release film is as follows:

[0033] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0034] Example 2

[0035] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 35% toluene, 15% ethyl acetate, 30% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0036] The preparation method of silicone modified acrylic resin is as follows:

[0037] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0038] The preparation method of the release film is as follows:

[0039] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in an oven at 80° C. for heating and curing for 15 seconds to obtain a release film.

[0040] Example 3

[0041] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 35% toluene, 15% ethyl acetate, 30% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-308 leveling agent.

[0042] The preparation method of silicone modified acrylic resin is as follows:

[0043] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0044] The preparation method of the release film is as follows:

[0045] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 70° C. oven for heating and curing for 20 seconds to obtain a release film.

[0046] Example 4

[0047] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 35% toluene, 15% ethyl acetate, 30% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-308 leveling agent.

[0048] The preparation method of silicone modified acrylic resin is as follows:

[0049] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 min, 5 g of methyltrimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 h to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0050] The preparation method of the release film is as follows:

[0051] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0052] Example 5

[0053] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 35% toluene, 15% ethyl acetate, 30% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 325 curing agent, and 2% BYK-307 leveling agent.

[0054] The preparation method of silicone modified acrylic resin is as follows:

[0055] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0056] The preparation method of the release film is as follows:

[0057] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0058] Comparative Example 1

[0059] Domestic MLCC release film purchased from the market.

[0060] Comparative Example 2

[0061] Imported MLCC release film purchased from the market.

[0062] The surface flatness and surface wettability of the release film prepared in the above embodiment and the release film of the comparative example were tested respectively. The test results are shown in the following table:

[0063] Test items Roughness Sa Roughness Sz Thickness difference Surface energy Testing requirements 8-12nm <1μm <1μm >15mN / m Example 1 9 0.976 0.8 17.96 Example 2 8 0.937 0.7 18.30 Example 3 8 0.894 0.7 17.77 Example 4 15 1.576 1.1 14.89 Example 5 13 1.467 1.0 14.57 Comparative Example 1 16 1.686 1.1 14.68 Comparative Example 2 8 0.920 0.7 17.98

[0064] It can be seen from the above table that the low-temperature curable, high-wettability MLCC casting release film provided by the present invention has lower surface roughness, smaller thickness range, and greater surface energy than the domestic MLCC release film. When casting ceramic slurry below 2μm, the slurry has better leveling and the thickness of the ceramic film is more uniform after curing. At the same time, the curing temperature of 70°C means lower energy consumption, thereby reducing production costs. The most important point is that the surface flatness of the low-temperature curable, high-wettability MLCC casting release film provided by the present invention is comparable to the wettability and imported MLCC release film, and the production cost is much lower than that of imported MLCC release film.

[0065] At the same time, it can be seen from the comparison of the above-mentioned embodiment 1 and embodiment 4 that the acrylic resin modification using fluoropropylene trimethoxy silane can bring better wettability improvement to the release film, as well as the improvement of the low-temperature curing effect. Considering that this is because the combination of acrylic resin and fluoropropylene trimethoxy silane has better chemical stability and temperature resistance, the addition of fluoropropylene trimethoxy silane not only improves wettability, but also enhances the efficiency of the curing reaction through its reactivity, so that complete curing can be achieved at a lower temperature. The design of this low-temperature curing can effectively reduce the thermal deformation problem of the substrate (such as PET film) caused by high temperature, ensuring that the release film remains flat during the production process. Fluorosilicon compounds have the characteristics of low surface energy due to their unique fluorine groups. This low surface energy can reduce the interfacial tension between slurry and film, making it easier for ceramic slurry to spread on the film surface. This explains that the surface energy of embodiments 1, 2, and 3 is higher (17.77-18.30mN / m), thereby improving the leveling of the slurry and the thickness uniformity of the film.

[0066] In the embodiment, the weight average molecular weight is controlled at about 15,000. This medium molecular weight helps to form a uniform film layer. If the molecular weight is too high, the resin will have insufficient fluidity and it will be difficult to form a flat surface; if the molecular weight is too low, the mechanical strength and durability of the film may be affected. By optimizing the molecular weight, the resin has good fluidity during coating and maintains sufficient mechanical properties after curing.

[0067] The fluorine group has a special surface smoothness property. The modified acrylic resin can reduce the microscopic bumps on the surface, so that the film exhibits lower roughness after curing (Sa value is in the range of 8-9nm), which significantly improves the flatness of the film and is suitable for ultra-thin MLCC cast film applications below 2μm.

[0068] Example 6

[0069] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 30% toluene, 15% ethyl acetate, 35% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0070] The preparation method of silicone modified acrylic resin is as follows:

[0071] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0072] The preparation method of the release film is as follows:

[0073] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0074] Example 7

[0075] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 40% toluene, 15% ethyl acetate, 25% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0076] The preparation method of silicone modified acrylic resin is as follows:

[0077] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0078] The preparation method of the release film is as follows:

[0079] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0080] Comparative Example 3

[0081] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 25% toluene, 15% ethyl acetate, 40% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0082] The preparation method of silicone modified acrylic resin is as follows:

[0083] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0084] The preparation method of the release film is as follows:

[0085] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0086] Comparative Example 4

[0087] This embodiment provides a low-temperature curable, high-wettability MLCC casting release film, which includes a substrate layer and a release agent layer; wherein the substrate layer is a PET film with a thickness of 25 μm. The raw materials of the release agent layer are composed of the following raw materials in weight percentage: 25% toluene, 40% ethyl acetate, 15% butanone, 15% silicone-modified acrylic resin with a molecular weight of about 15,000, 3% Cymel 303 curing agent, and 2% BYK-307 leveling agent.

[0088] The preparation method of silicone modified acrylic resin is as follows:

[0089] 30 g of butyl acrylate and 20 g of ethyl acrylate were mixed and allowed to stand for 30 minutes, 5 g of fluoropropylene trimethoxysilane was added, and after stirring evenly, 2 g of initiator benzoyl peroxide was added, and the mixture was heated to 65° C. and kept warm for 3 hours to obtain a silicone-modified acrylic resin with a weight average molecular weight of 15,000.

[0090] The preparation method of the release film is as follows:

[0091] Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent were mixed and stirred in proportion to obtain a release agent, the release agent was coated on the surface of the substrate layer, and placed in a 90° C. oven for heating and curing for 10 seconds to obtain a release film.

[0092] The release films of Examples 6-7 and Comparative Examples 3 and 4 were tested for surface flatness and surface wettability. The test results are shown in the following table:

[0093] Test items Roughness Sa Roughness Sz Thickness difference Surface energy Testing requirements 8-12nm <1μm <1μm >15mN / m Example 1 9 0.976 0.8 17.96 Example 6 10 0.982 0.9 15.98 Example 7 11 1.033 0.9 15.74 Comparative Example 3 17 1.327 1.0 14.22 Comparative Example 4 8 1.284 1.0 14.59

[0094] The solvent system composed of toluene, ethyl acetate and butanone helps control the leveling of the resin during the coating process. Different solvents have different evaporation rates. The combination of them can ensure that the release agent can be evenly spread during coating and gradually evaporate during the heating process, reducing the formation of bubbles and surface defects.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low temperature curable, high wettability MLCC casting release film, characterized in that: The release film comprises a substrate layer and a release agent layer, wherein the release agent layer is made of the following raw materials in percentage by weight: 30-40% toluene, 10-15% ethyl acetate, 20-35% butanone, 10-20% silicone-modified acrylic resin, 2-3% curing agent, and 1-2% leveling agent.

2. The low temperature curable, high wettability MLCC casting release film according to claim 1, characterized in that: The preparation method of the organosilicon-modified acrylic resin comprises: mixing butyl acrylate and ethyl acrylate and standing for 20-40 minutes, adding fluoropropylene trimethoxysilane, stirring evenly, adding initiator benzoyl peroxide, heating to 60-70° C., keeping the temperature for reaction for 2-4 hours, and obtaining the organosilicon-modified acrylic resin.

3. The low temperature curable, high wettability MLCC casting release film according to claim 2, characterized in that: The weight average molecular weight of the prepared organosilicon-modified acrylic resin is 14000-16000.

4. The low temperature curable, high wettability MLCC casting release film according to claim 2, characterized in that: The mass ratio of butyl acrylate:ethyl acrylate:fluoropropylenetrimethoxysilane:benzoyl peroxide is 30:(15-25):(4-6):(1-3).

5. The low temperature curable, high wettability MLCC casting release film according to claim 1, characterized in that: The curing agent is an amino curing agent.

6. The low temperature curable, high wettability MLCC casting release film according to claim 1, characterized in that: The leveling agent is a polyether leveling agent.

7. The low temperature curable, high wettability MLCC casting release film according to claim 1, characterized in that: The substrate layer is a PET film.

8. The low temperature curable, high wettability MLCC casting release film according to claim 1, characterized in that: The roughness Sa of the substrate layer is 8-12 nm.

9. The method for preparing a low temperature curable, high wettability MLCC casting release film according to any one of claims 1 to 8, characterized in that: The steps include: Toluene, ethyl acetate, silicone-modified acrylic resin, curing agent and leveling agent are mixed and stirred in proportion to obtain a release agent, the release agent is coated on the surface of the substrate layer, and heated and cured to obtain a release film.

10. The method for preparing a low temperature curable, high wettability MLCC casting release film according to claim 9, characterized in that: The heating temperature is 70-90°C and the heating time is 10-20s.