A rust-proof film and a packaging method of a small-size ceramic copper-clad carrier board

Abstract

The present application relates to the field of copper-clad plate packaging, and particularly discloses a packaging method for small-size ceramic copper-clad plate; the small-size ceramic copper-clad plate is coated with a rust-proof film on the outside; the rust-proof film comprises, from top to bottom, a base layer, a functional layer and a base layer; the base layer comprises linear polyethylene, modified polyethylene and metallocene polyethylene; the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene and an anticorrosive agent; the preparation of the anticorrosive agent comprises the following steps: taking morpholine, ethanol and benzotriazole, mixing uniformly, adding formaldehyde, stirring, adding urea and polyaspartic acid, reflux heating, cooling, filtering, washing, drying, and obtaining the anticorrosive agent; the preparation of the modified polyethylene comprises the following steps: taking hydroxylated polyethylene, 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, sodium alginate and water, adding sulfuric acid to a pH of 3-4, heating and reacting, removing the solvent, and drying to obtain the modified polyethylene.

Description

Technical Field

[0001] This invention relates to the field of copper-clad laminate packaging, and specifically discloses a method for packaging a rust-proof film and a small-sized ceramic copper-clad substrate. Background Technology

[0002] With the continued rise in demand for power semiconductors, the demand for copper-clad ceramic substrates of various sizes is also increasing daily. Based on different shipping methods, they are generally divided into three types: master board delivery, small-size delivery, and tray delivery. In China, copper-clad ceramic substrates used in power electronics, environmental protection, and white goods are mostly shipped in small sizes. This requires manufacturers to have specialized packaging methods to ensure that products are not oxidized, scratched, or damaged during transportation and storage. Only in this way can the product before customer use be completely consistent with the product shipped by the manufacturer. Otherwise, problems caused by packaging issues, such as damage during transportation and storage failures, will increase additional costs, cause irreparable losses, and, more importantly, damage the manufacturer's reputation. Therefore, researching a rust-proof film with good rust prevention and mechanical properties for packaging small-size copper-clad ceramic substrates is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide a packaging method for an anti-rust film and a small-sized ceramic copper-clad substrate, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A rust-preventive film, comprising, from top to bottom: a 5-8 μm substrate layer, a 35-40 μm functional layer, and a 5-8 μm substrate layer; the substrate layer comprises linear polyethylene, modified polyethylene, and metallocene polyethylene; the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene, and a corrosion resistant agent.

[0006] The preparation of the corrosion resistant agent includes the following steps: taking morpholine, ethanol, and benzotriazole, mixing them evenly, adding formaldehyde, stirring, adding urea and polyaspartic acid, reflux heating, cooling, filtering, washing, drying, and obtaining the corrosion resistant agent;

[0007] The preparation of the modified polyethylene includes the following steps: taking hydroxylated polyethylene, 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, sodium alginate, and water, adding sulfuric acid to a pH of 3-4, heating to react, removing the solvent, and drying to obtain modified polyethylene.

[0008] More preferably, the matrix layer comprises linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:(2-3):(1-2); the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:(3-4):(1-2):(3-4).

[0009] More preferably, the corrosion resistant agent comprises the following raw materials in parts by mass: 40-50 parts morpholine, 100-120 parts ethanol, 20-30 parts benzotriazole, 60-80 parts formaldehyde, 20-30 parts urea, and 10-20 parts polyaspartic acid.

[0010] More preferably, the modified polyethylene comprises the following raw materials, by mass parts: 15-20 parts hydroxylated polyethylene, 1-2 parts 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 2-4 parts sodium alginate, and 200-250 parts water.

[0011] In a more optimized manner, the preparation of the hydroxylated polyethylene includes the following steps: taking terminal hydroxyl polybutadiene and a hydrogenation catalyst, heating in an argon atmosphere, introducing hydrogen gas, maintaining a pressure of 1-2 MPa, reacting for 30-40 h, cooling, precipitating, separating, purifying, and drying to obtain hydroxylated polyethylene.

[0012] More preferably, the hydroxylated polyethylene comprises the following raw materials, by mass: 3 to 5 parts of hydroxyl-terminated polybutadiene and 0.05 to 0.1% of a hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene.

[0013] In a more optimized manner, the three layers of the anti-rust film are extruded using a multi-layer co-extrusion device at an extrusion temperature of 180–200°C.

[0014] A method for packaging small-sized ceramic copper-clad substrates, using the aforementioned anti-rust film, includes the following steps:

[0015] S1: Cut the anti-rust film into a suitable packaging size, place several small-sized ceramic copper-clad substrates inside, arrange them neatly, package them, and fix the anti-rust film with tape;

[0016] S2: Put the product obtained in S1 into a plastic box, put desiccant and foam into the gaps on both sides of the plastic box, fill it until the product obtained in S1 does not move in the plastic box, put in a humidity card, put foam on the top, cover the plastic box with the lid, and fix it with tape around 3 times.

[0017] S3: Pack the product obtained in S2 into an aluminum foil bag, vacuum it, seal it, inspect it, wrap bubble wrap around the outer layer and secure it with tape, pack it into a box, seal the box, and the packaging is complete.

[0018] Compared with the prior art, the beneficial effects achieved by this application are:

[0019] The rust-proof film comprises, from top to bottom, a substrate layer, a functional layer, and another substrate layer; the substrate layer exhibits good mechanical properties such as puncture resistance, impact resistance, and tensile strength, as well as good chemical resistance; the functional layer contains a corrosion inhibitor and has excellent rust-proof properties; the three layers are co-extruded together, and this structure gives the rust-proof film both good mechanical and rust-proof properties, and the manufacturing process is simple.

[0020] The corrosion inhibitor is a VCI (Vacuum Injection) rust inhibitor, whose raw materials include morpholine, benzotriazole, formaldehyde, urea, and polyaspartic acid. Morpholine is one of the earliest VCIs used, but when used alone, it cannot completely cover and protect the metal surface from corrosion. Therefore, benzotriazole is introduced. Benzotriazole is a typical copper-based VCI, which has an outstanding rust-preventing effect on copper-clad substrates. The two VCIs are used in combination to obtain a Mannich base through the Mannich reaction. This base has a stable structure, strong adsorption, and easily forms coordination bonds to form complexes, resulting in a good rust-preventing effect. This invention also introduces polyaspartic acid, whose amino group in its structure allows it to participate in the reaction. Polyaspartic acid itself has a metal corrosion inhibition effect and good water solubility, which improves the water solubility of the corrosion inhibitor, making it easier for it to penetrate the thin electrolyte layer on the metal surface and compete with corrosion molecules for effective and complete adsorption protection.

[0021] This invention also prepares a modified polyethylene, which modifies hydroxyl-containing polyethylene with 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid and sodium alginate. 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid has a similar structure to polyethylene and polyaspartic acid in the corrosion inhibitor, increasing their compatibility. Furthermore, the carboxyl group provides excellent adsorption and complexing capabilities, aiding in rust prevention. The introduction of sodium alginate into polyethylene increases its flexibility and tensile strength, while also increasing chain segment activity and accelerating the frequency of free volume distribution changes, which is beneficial for the diffusion of the corrosion inhibitor and further enhances its corrosion resistance. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 It is a pre-cut rust-proof film;

[0024] Figure 2 It is a small-sized ceramic copper-clad substrate wrapped with an anti-rust film;

[0025] Figure 3 It is a small-sized ceramic copper-clad substrate that fits into a plastic box;

[0026] Figure 4 It is a small-sized ceramic copper-clad substrate packaged in an aluminum foil bag;

[0027] Figure 5 It is a small-sized ceramic copper-clad substrate with an outer layer of bubble wrap;

[0028] Figure 6 It is a small-sized ceramic copper-clad substrate for complete packaging. Detailed Implementation

[0029] The following are preferred embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, all other embodiments obtained by those skilled in the art without creative effort without departing from the principles of the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Unless otherwise specified, all the following quantities are parts by weight.

[0031] Example 1: Preparation of corrosion resistance agent: Take 45 parts of morpholine, 120 parts of ethanol, and 25 parts of benzotriazole, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 25 parts of urea and 15 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, and dry to obtain corrosion resistance agent;

[0032] Preparation of modified polyethylene: S1: Take 4 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0033] S2: Take 18 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 3 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0034] Preparation of anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0035] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:1.

[0036] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:3.

[0037] Example 2: Preparation of corrosion resistance agent: Take 50 parts of morpholine, 120 parts of ethanol, and 30 parts of benzotriazole, mix them evenly, add 80 parts of formaldehyde, stir for 2 hours, add 30 parts of urea and 20 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, and dry to obtain corrosion resistance agent;

[0038] Preparation of modified polyethylene: S1: Take 5 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0039] S2: Take 20 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 4 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0040] Preparation of anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0041] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:3:1.

[0042] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:3.

[0043] Example 3: Preparation of corrosion resistance agent: Take 40 parts of morpholine, 120 parts of ethanol, and 20 parts of benzotriazole, mix them evenly, add 60 parts of formaldehyde, stir for 2 hours, add 20 parts of urea and 10 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, and dry to obtain corrosion resistance agent;

[0044] Preparation of modified polyethylene: S1: Take 3 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0045] S2: Take 15 parts of hydroxylated polyethylene, 1 part of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 2 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0046] Preparation of anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0047] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:2.

[0048] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:4.

[0049] Example 4: Preparation of corrosion resistance agent: Take 50 parts of morpholine, 120 parts of ethanol, and 20 parts of benzotriazole, mix them evenly, add 80 parts of formaldehyde, stir for 2 hours, add 30 parts of urea and 10 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, and dry to obtain corrosion resistance agent;

[0050] Preparation of modified polyethylene: S1: Take 5 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0051] S2: Take 20 parts of hydroxylated polyethylene, 1 part of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 4 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0052] Preparation of anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0053] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:1.

[0054] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:3:1:3.

[0055] Comparative Example 1: (Benztriazole was not added when preparing the corrosion resistance agent; the other steps were the same as in Example 1) Preparation of corrosion resistance agent: Take 60 parts of morpholine and 120 parts of ethanol, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 25 parts of urea and 15 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, dry, and obtain the corrosion resistance agent;

[0056] Preparation of modified polyethylene: S1: Take 4 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0057] S2: Take 18 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 3 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0058] Preparation of the anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0059] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:1.

[0060] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:3.

[0061] Comparative Example 2: (Polyaspartic acid was not added when preparing the corrosion resistance agent; the remaining methods and steps were the same as in Example 1) Preparation of corrosion resistance agent: Take 45 parts of morpholine, 120 parts of ethanol, and 25 parts of benzotriazole, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 40 parts of urea, reflux and heat for 10 hours, cool, filter, wash, and dry to obtain the corrosion resistance agent;

[0062] Preparation of modified polyethylene: S1: Take 4 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0063] S2: Take 18 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 3 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0064] Preparation of the anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0065] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:1.

[0066] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:3.

[0067] Comparative Example 3 (without added modified polyethylene, the remaining methods and steps are the same as in Example 1): Preparation of corrosion resistance agent: Take 45 parts of morpholine, 120 parts of ethanol, and 25 parts of benzotriazole, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 25 parts of urea and 15 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, dry, and obtain corrosion resistance agent;

[0068] Preparation of the anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0069] The matrix layer is composed of linear polyethylene and metallocene polyethylene in a mass ratio of 8:1;

[0070] The functional layer is composed of linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 9:2:3.

[0071] Comparative Example 4 (the preparation method of the substrate layer was changed, and the rest of the steps were the same as in Example 1): Preparation of corrosion resistance agent: Take 45 parts of morpholine, 120 parts of ethanol, and 25 parts of benzotriazole, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 25 parts of urea and 15 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, dry, and obtain corrosion resistance agent;

[0072] Preparation of modified polyethylene: S1: Take 4 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0073] S2: Take 18 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 3 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0074] Preparation of the anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0075] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 5:5:2.

[0076] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:4:2:3.

[0077] Comparative Example 5: (The preparation method of the functional layer is changed, and the other steps are the same as in Example 1) Preparation of corrosion resistance agent: Take 45 parts of morpholine, 120 parts of ethanol, and 25 parts of benzotriazole, mix them evenly, add 70 parts of formaldehyde, stir for 2 hours, add 25 parts of urea and 15 parts of polyaspartic acid, reflux and heat for 10 hours, cool, filter, wash, dry, and obtain corrosion resistance agent;

[0078] Preparation of modified polyethylene: S1: Take 4 parts of hydroxyl-terminated polybutadiene and 0.1% of hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene, heat to 100°C in an argon atmosphere, introduce hydrogen gas, maintain pressure at 1MPa, react for 38h, cool, precipitate, separate, purify, and dry to obtain hydroxylated polyethylene.

[0079] S2: Take 18 parts of hydroxylated polyethylene, 2 parts of 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 3 parts of sodium alginate, and 250 parts of water, add sulfuric acid to pH 3, heat to 95℃ and react for 6 hours, remove the solvent and dry to obtain modified polyethylene.

[0080] Preparation of anti-rust film: The anti-rust film consists of, from top to bottom, a 5μm substrate layer, a 40μm functional layer, and a 5μm substrate layer; the three layers are extruded using a multi-layer co-extrusion equipment at an extrusion temperature of 190℃;

[0081] The matrix layer is composed of linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:2:1.

[0082] The functional layer consists of modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 2:5:1:3.

[0083] Unless otherwise specified, the experimental methods used in the above embodiments are conventional methods; the raw materials used are commercially available unless otherwise specified, and the sources of the raw materials are as follows: linear polyethylene (Dow 4140); metallocene polyethylene (Dow AT6111); morpholine (CAS: 110-91-8); ethanol (CAS: 64-17-5); benzotriazole (S26062, Shanghai Yuanye); formaldehyde (CAS: 50-00-0); urea (S 30375 (Shanghai Yuanye); Polyaspartic acid (GA0917, Hubei Guangao Biotechnology Co., Ltd.); Hydroxyl-terminated polybutadiene (ZS-11116, Shanghai Zhenzhun Biotechnology Co., Ltd.); Tris(triphenylphosphine) rhodium chloride (CAS: 14694-95-2); 2-Hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid (SS4256, Hubei Shishun Biotechnology Co., Ltd.); Sodium alginate (S11053, Shanghai Yuanye).

[0084] Experiment: Take the anti-rust films prepared in Examples 1-3 and Comparative Examples 1-4; (1) Test the tensile strength according to GB / T1040.1-2018; (2) Test the vapor phase corrosion inhibition ability according to GB / T16267-2008; the specific data are shown in the table below;

[0085]

[0086] Conclusions: In Comparative Example 1, the absence of benzotriazole in the preparation of the corrosion inhibitor resulted in a decrease in vapor phase corrosion inhibition. In Comparative Example 2, the absence of polyaspartic acid in the preparation of the corrosion inhibitor led to a decrease in both vapor phase corrosion inhibition and tensile strength. In Comparative Example 3, the absence of modified polyethylene, due to its highly active chain segments which facilitated the diffusion of the corrosion inhibitor, and the similar chain segments between the modified polyethylene and the corrosion inhibitor, resulted in good compatibility; the absence of modified polyethylene would lead to a decline in performance. Comparative Examples 4 and 5, which altered the proportions of raw materials in the substrate and functional layers, showed performance inferior to the examples, demonstrating the importance of proportions. In summary, the anti-rust film prepared by this invention exhibits excellent anti-rust capabilities and good tensile strength, making it suitable for packaging small-sized ceramic copper-clad substrates.

[0087] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the spirit and principles of the present invention and within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rust-preventive film, characterized in that: The anti-rust film comprises, from top to bottom: a 5-8 μm substrate layer, a 35-40 μm functional layer, and a 5-8 μm substrate layer; the substrate layer comprises linear polyethylene, modified polyethylene, and metallocene polyethylene; the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene, and a corrosion resistant agent; The preparation of the corrosion resistant agent includes the following steps: taking morpholine, ethanol, and benzotriazole, mixing them evenly, adding formaldehyde, stirring, adding urea and polyaspartic acid, reflux heating, cooling, filtering, washing, drying, and obtaining the corrosion resistant agent; The preparation of the modified polyethylene includes the following steps: taking hydroxylated polyethylene, 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, sodium alginate, and water, adding sulfuric acid to a pH of 3-4, heating to react, removing the solvent, and drying to obtain modified polyethylene.

2. The anti-rust film according to claim 1, characterized in that: The matrix layer comprises linear polyethylene, modified polyethylene, and metallocene polyethylene in a mass ratio of 6:(2-3):(1-2); the functional layer comprises modified polyethylene, linear polyethylene, metallocene polyethylene, and corrosion resistant agent in a mass ratio of 5:(3-4):(1-2):(3-4).

3. The anti-rust film according to claim 1, characterized in that: The corrosion resistant agent comprises the following raw materials, in parts by weight: 40-50 parts morpholine, 100-120 parts ethanol, 20-30 parts benzotriazole, 60-80 parts formaldehyde, 20-30 parts urea, and 10-20 parts polyaspartic acid.

4. The anti-rust film according to claim 1, characterized in that: The modified polyethylene comprises the following raw materials, by mass parts: 15-20 parts hydroxylated polyethylene, 1-2 parts 2-hydroxy-2-[(1-oxo-2-propenyl)amino]acetic acid, 2-4 parts sodium alginate, and 200-250 parts water.

5. The anti-rust film according to claim 1, characterized in that: The preparation of the hydroxylated polyethylene includes the following steps: Hydroxyl-terminated polybutadiene and a hydrogenation catalyst were added, heated under an argon atmosphere, and hydrogen was introduced while maintaining a pressure of 1–2 MPa. The reaction was carried out for 30–40 h, followed by cooling, precipitation, separation, purification, and drying to obtain hydroxylated polyethylene.

6. The anti-rust film according to claim 5, characterized in that: The hydroxylated polyethylene comprises the following raw materials, by mass: 3-5 parts of hydroxyl-terminated polybutadiene and 0.05-0.1% of a hydrogenation catalyst by mass of hydroxyl-terminated polybutadiene.

7. The anti-rust film according to claim 1, characterized in that: The three layers of the anti-rust film are extruded using a multi-layer co-extrusion device at an extrusion temperature of 180–200°C.

8. A packaging method for a small-sized ceramic copper-clad substrate, characterized in that: Using the anti-rust film according to any one of claims 1 to 7 includes the following steps: S1: Cut the anti-rust film into a suitable packaging size, place several small-sized ceramic copper-clad substrates inside, arrange them neatly, package them, and fix the anti-rust film with tape; S2: Put the product obtained in S1 into a plastic box, put desiccant and foam into the gaps on both sides of the plastic box, fill it until the product obtained in S1 does not move in the plastic box, put in a humidity card, put foam on the top, cover the plastic box with the lid, and fix it with tape around 3 times. S3: Pack the product obtained in S2 into an aluminum foil bag, vacuum it, seal it, inspect it, wrap bubble wrap around the outer layer and secure it with tape, pack it into a box, seal the box, and the packaging is complete.

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