Highly adhesive weather-resistant adhesive for water-cooled pipe insulation film, method for preparing the same, and insulation film

Abstract

The application discloses a kind of high-stick weather-resistant adhesive for water-cooled tube insulation film, its preparation method and insulation film, the adhesive includes the following raw material components by weight parts:100 parts of acrylate copolymer, 0.1-1 parts of curing agent, 5-20 parts of rosin resin and terpene phenol resin mixture, 15-60 parts of organic solvent;When synthesizing acrylate copolymer, silane coupling agent is introduced into molecular chain by free radical initiation polymerization mode, and the double bond of silane coupling agent participates in reaction, and the other end reacts with the surface of base material when the insulation film is attached to water-cooled tube to form siloxane bond, so that a dense " molecular bridge " is formed at inorganic and organic interface, the penetration path of aging factors such as moisture and oxygen is reduced, and the bonding force of interface is greatly enhanced, the weather resistance is improved, and the aging process caused by ultraviolet irradiation and temperature and humidity change is slowed down.The insulation film provided by the application significantly enhances the bonding performance and aging performance of materials such as aluminum plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesives, in particular to a high-adhesion weather-resistant adhesive for water-cooled pipe insulation film, a preparation method thereof and an insulation film. BACKGROUND

[0002] With the rapid development of the new energy vehicle market, great innovation has been made in battery heat dissipation technology. In the design of battery packs, engineers arrange cylindrical batteries in a specific way and arrange water-cooled pipes in a serpentine shape in the gaps. This design allows the cooling liquid to directly contact the battery shell and effectively remove the heat generated during battery operation through heat exchange. In order to ensure electrical safety, the water pipes in the cooling system and the battery are isolated using insulation materials. This usually involves the use of specially designed insulation films or insulation layers to prevent direct contact between the cooling liquid and the high-voltage electrode while ensuring good heat conduction efficiency.

[0003] Currently, the insulation layer of cylindrical batteries on the market is more commonly made of polyurethane, epoxy resin, and polyolefin structural adhesives. Structural adhesive insulation layers are generally attached using a hot pressing method, which has low efficiency and the cured insulation layer is usually brittle and has problems such as rapid decay of breakdown voltage after double 85 aging and excessive leakage current. Moreover, once the insulation layer is sprayed, it cannot be changed, and the convenience is poor. Using conventional acrylic adhesive for attachment has low adhesion and small shear strength, which poses a risk of delamination during continuous vehicle travel and vibration, and poor weather resistance.

[0004] Therefore, it is necessary to develop a high-adhesion weather-resistant adhesive for water-cooled pipe insulation film and a PETG film attachment scheme to solve the above problems. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a high-adhesion weather-resistant adhesive for water-cooled pipe insulation film, a preparation method thereof and an insulation film to address the deficiencies in the prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows: In a first aspect, the present application provides a high-adhesion weather-resistant adhesive for water-cooled pipe insulation film, which comprises the following raw material components by weight:

[0007] 100 parts of an acrylate copolymer, 0.1-1 parts of a curing agent, 5-20 parts of a mixture of rosin resin and terpene phenol resin, and 15-60 parts of an organic solvent.

[0008] The raw materials for synthesizing the acrylate copolymer include, by weight: 40-70 parts of soft monomer, 15-30 parts of hard monomer, 1-5 parts of epoxy vinyl monomer, 3-6 parts of functional monomer, 0.5-1 part of free radical initiator, 0.5-1 part of silane coupling agent, and 100-200 parts of organic solvent.

[0009] Preferably, the soft monomer is selected from one or more of isooctyl acrylate, n-butyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate;

[0010] The hard monomer is selected from one or more of methyl methacrylate, isobornyl acrylate, styrene, acrylonitrile, methyl acrylate;

[0011] The functional monomer is selected from one or more of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, glycidyl methacrylate, acrylamide, N-methylol acrylamide, vinyl trimethyl siloxane, vinyl triethoxy silane, acrylic acid, acryloyl morpholine;

[0012] Preferably, the epoxy vinyl monomer is glycidyl methacrylate.

[0013] Preferably, the silane coupling agent is selected from one or more of y-methacryloyloxypropyl trimethoxysilane (KH570), N-β-(aminoethyl)-γ-aminopropyl trimethoxysilane (KH-792), γ-aminopropyl triethoxysilane (KH550), γ-glycidyl ether propyl trimethoxysilane (KH560);

[0014] The free radical initiator is one or both of azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO);

[0015] The organic solvent is selected from one or more of ethyl acetate, toluene, butanone.

[0016] Preferably, the acrylate copolymer is prepared by the following method:

[0017] S1. Under an inert atmosphere, the soft monomer, the hard monomer, the epoxy vinyl monomer, the functional monomer, and the silane coupling agent are added to a reaction kettle, stirred uniformly, heated to 70°C, then 1 / 4 of the total mass of free radical initiator is added, and stirred for 2 hours;

[0018] S2. Maintain 70°C, mix 1 / 3 of the total mass of free radical initiator with part of the organic solvent, then add to the reaction system dropwise, complete dropwise addition within 1.5 hours, then incubate for 1-2 hours;

[0019] S3. Add the remaining free radical initiator, heat to 85°C, and react for 3 hours;

[0020] S4. After the reaction is completed, add the remaining organic solvent to dilute the product, to obtain the acrylate copolymer.

[0021] Preferably, the solid content of the acrylate copolymer is 30%-40%, the weight average molecular weight is 50-100W, and the glass transition temperature is -35℃ to -10℃.

[0022] Preferably, the rosin resin is one or more of 138, 145, Foral 105-E, Foral 85, Foralyn 110, WR-D135;

[0023] The terpene phenol resin is one or more of 1160, WTPR-801L, WTPR-3603, WTPR-803L;

[0024] The curing agent is one or more of XR-100, GA-240, L-75, L-45.

[0025] Preferably, the mass ratio of the rosin resin and the terpene phenol resin is 2:1-4:1.

[0026] In a second aspect of the present application, a preparation method of the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film is provided, and the method comprises the following steps: mixing an acrylate copolymer, a curing agent, a rosin resin and a terpene phenol resin mixture, and an organic solvent, and stirring uniformly to obtain the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film.

[0027] In a third aspect of the present application, a water-cooled pipe insulation film is provided, and the film is prepared by the following method: uniformly coating the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film on a release film, drying to remove the solvent, then adhering the adhesive surface to a PETG film, and aging to obtain the water-cooled pipe insulation film.

[0028] The present application has the following advantages:

[0029] The present application provides a high-adhesion weather-resistant adhesive for water-cooled pipe insulation film and an insulation film. In the acrylate copolymer of the present application, IBOA contains a larger isobornyl group, and this rigid side group can limit the movement of polymer segments, thereby improving the hardness and wear resistance of the polymer.

[0030] When the acrylate copolymer is synthesized, the silane coupling agent is introduced into the molecular chain by free radical initiation polymerization. The double bond of the silane coupling agent participates in the reaction, and the other end reacts with the surface of the substrate when the insulation film is adhered to the water-cooled pipe to form a silicon-oxygen bond, thereby forming a dense "molecular bridge" at the inorganic-organic interface, reducing the penetration path of aging factors such as moisture and oxygen, and greatly enhancing the bonding force of the interface, improving the weather resistance, and slowing down the aging process caused by ultraviolet radiation and changes in temperature and humidity.

[0031] The addition of hydroxyl functional monomers can further improve the wettability and compatibility of the adhesive with other materials, and these functional groups can also act as reaction points to promote chemical bonding with the surface of other materials, thereby improving the durability and reliability of the bonding, and in combination with terpene phenol and rosin tackifying resin, which are rich in polar groups and long carbon chain structures, the adhesion strength and cohesion of the adhesive are significantly improved, and the wettability and adhesion to various substrates are also enhanced, especially in complex outdoor environments, showing excellent weather resistance.

[0032] The insulating film provided by the present application significantly enhances the bonding performance and aging performance to materials such as aluminum plates, and in some preferred embodiments, the prepared insulating film product has a 3500VDC leakage current < 2uA after double 85 aging, a 50um glue-coated PEFG film has a peel strength > 40N / 25mm, and a shear strength of more than 4MPa. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below with reference to the examples, so that those skilled in the art can implement the present application according to the description.

[0034] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0035] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples, unless otherwise specified, can be obtained commercially. The specific conditions in the following examples are not specified, and are carried out according to conventional conditions or manufacturer's recommended conditions. The reagents or instruments used, if not specified by the manufacturer, are conventional products that can be obtained commercially.

[0036] The present application provides a kind of high-stick weatherability adhesive for water-cooled tube insulating film, comprising the following raw material components by weight parts:

[0037] 100 parts of acrylate copolymer, 0.1-1 parts of curing agent, 5-20 parts of rosin resin and terpene phenol resin mixture, 15-60 parts of organic solvent;

[0038] The raw materials for synthesizing acrylate copolymer include, by weight parts: soft monomer 40-70 parts, hard monomer 15-30 parts, epoxy vinyl monomer 1-5 parts, functional monomer 3-6 parts, free radical initiator 0.5-1 parts, silane coupling agent 0.5-1 parts, organic solvent 100-200 parts.

[0039] In preferred embodiments, the soft monomer is selected from one or more of isooctyl acrylate, n-butyl acrylate, ethyl acrylate, lauryl acrylate, stearyl acrylate; more preferably, the soft monomer is selected from one or more of isooctyl acrylate, butyl acrylate, ethyl acrylate.

[0040] In preferred embodiments, the hard monomer is selected from one or more of methyl methacrylate, isobornyl acrylate, styrene, acrylonitrile, methyl acrylate; more preferably, the hard monomer is selected from one or more of isobornyl acrylate and methyl acrylate.

[0041] In preferred embodiments, the functional monomer is selected from one or more of 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, glycidyl methacrylate, acrylamide, N-methylol acrylamide, vinyltrimethylsiloxane, vinyltriethoxysilane, acrylic acid, acryloyl morpholine; more preferably, the functional monomer is 2-hydroxyethyl acrylate (HEA).

[0042] In preferred embodiments, the epoxy vinyl monomer is glycidyl methacrylate (GMA). The introduction of the epoxy functional group can be by either free radical initiation of the double bond in the synthetic copolymer segment or by the addition of an epoxy resin in the formulation segment, the present application preferably employs the polymerization method for the introduction of the epoxy vinyl monomer.

[0043] The silane coupling agent is selected from one or more of y-methacryloyloxypropyltrimethoxysilane (KH570), N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane (KH-792), γ-aminopropyltriethoxysilane (KH550), γ-glycidoxypropyltrimethoxysilane (KH560); more preferably, the silane coupling agent is y-methacryloyloxypropyltrimethoxysilane (KH570).

[0044] In preferred embodiments, the free radical initiator is selected from one or more of azobisisobutyronitrile (AIBN) and benzoyl peroxide (BPO).

[0045] In preferred embodiments, the organic solvent is selected from one or more of ethyl acetate, toluene, butanone.

[0046] In preferred embodiments, the acrylate copolymer is prepared by the following method:

[0047] S1, under inert atmosphere (nitrogen protection to exclude oxygen interference), the soft monomer, hard monomer, epoxy vinyl monomer, functional monomer and silane coupling agent are added into the reaction kettle, stirred uniformly, heated to 70°C, then 1 / 4 of the total mass of free radical initiator is added, the polymerization reaction is started, and the reaction is stirred for 2 hours; this stage aims to initially establish the polymer chain, while ensuring the effective integration of the silane coupling agent;

[0048] S2, maintain 70°C, mix 1 / 3 of the total mass of free radical initiator with part of the organic solvent, then add it dropwise to the reaction system, dropwise addition is completed within 1.5 hours, during the dropwise addition process, the molecular weight distribution of the product can be effectively adjusted by controlling the dropwise addition rate and temperature (maintaining 70°C), thereby optimizing the material performance; then keep warm for 1-2 hours; to fully complete the chain growth process;

[0049] S3, add the remaining free radical initiator, heat to 85°C, and react for 3 hours; to promote deeper polymerization reaction and molecular weight growth, until the predetermined viscosity change is observed, indicating that the reaction is close to completion;

[0050] S4, after the reaction is completed, the remaining organic solvent is added to dilute the product, to obtain an acrylate copolymer. An appropriate amount of organic solvent is added to the product to reduce the viscosity, while achieving rapid cooling to room temperature, which helps to improve the processability and stability of the product; then, the prepared glue is transferred to a container and sealed for storage to prevent contamination or deterioration.

[0051] In a preferred embodiment, the solid content of the acrylate copolymer is 30%-40%, the weight average molecular weight is 50-100W, and the glass transition temperature is -35°C to -10°C.

[0052] In a preferred embodiment, the rosin resin is selected from one or more of 138, 145, Foral 105-E, Foral 85, Foralyn 110, WR-D135.

[0053] In a preferred embodiment, the terpene phenol resin is selected from one or more of 1160, WTPR-801L, WTPR-3603, WTPR-803L.

[0054] In a preferred embodiment, the curing agent is selected from one or more of XR-100, GA-240, L-75, L-45; further preferably L-75.

[0055] In a preferred embodiment, the mass ratio of rosin resin and terpene phenol resin is 2:1-4:1.

[0056] The application further provides a preparation method of the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film, comprising the following steps: mixing an acrylate copolymer, a curing agent, a rosin resin and a terpene phenol resin mixture, and an organic solvent, and uniformly stirring to obtain the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film.

[0057] The application further provides a water-cooled pipe insulation film, which is prepared by the following method: uniformly coating the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film on a release film, drying to remove the solvent, and then laminating the adhesive surface to a PETG film and aging to obtain the water-cooled pipe insulation film.

[0058] The PETG film has good thermal conductivity, can reduce the thermal resistance between the assembly and the heat dissipation medium, and has stable chemical properties, good resistance to cooling liquid, salt spray and grease.

[0059] In the synthesis process of the acrylate copolymer, a silane coupling agent is introduced. This process uses a free radical polymerization mechanism to ensure that the double bond in the silane coupling agent actively participates in the copolymerization reaction. This design strategy aims to form a stable silicon-oxygen bond between the other end of the silane coupling agent and the surface of the inorganic substrate through a hydrolysis reaction during the subsequent application stage, i.e., when the insulation film is laminated to the surface of the water-cooled pipe, significantly enhancing the wettability and adhesion of the interface and effectively resisting aging caused by environmental factors.

[0060] In addition, an epoxy vinyl monomer is deliberately added as a reactive component during polymerization, aiming to introduce epoxy functional groups into the main chain of the copolymer. The introduction of these epoxy groups greatly enhances the mechanical toughness and shear resistance of the adhesive layer, further improving the overall stability and shear strength of the material.

[0061] In the formula section of the high-adhesion weather-resistant adhesive for water-cooled pipe insulation film, the ratio of the curing agent and the tackifying resin is controlled to achieve the dual characteristics of the adhesive: both excellent initial adhesion and long-lasting high adhesion, and long-term weather resistance in harsh weather conditions. Through meticulous molecular design and formulation adjustment strategies, the adhesive meets the high-performance requirements of water-cooled pipe insulation film applications, including enhanced bonding strength, aging resistance and environmental adaptability.

[0062] The above is the general idea of the application, and the following provides detailed examples and comparative examples based on it to further illustrate the application.

[0063] The main raw materials involved in the following examples and comparative examples are as follows:

[0064]

[0065] Example 1

[0066] A kind of high viscosity weather-resistant adhesive for water-cooled tube insulation film, including the following raw material components by weight parts:100 parts of acrylic ester copolymer, 0.5 parts of curing agent L-75, 15 parts of hydrogenated rosin resin, 5 parts of terpene phenol resin, 30 parts of organic solvent (ethyl acetate).

[0067] The raw materials for synthesizing acrylic ester copolymer include, by weight parts:

[0068] Soft monomer: isooctyl acrylate 40 parts, butyl acrylate 15 parts, hard monomer: isobornyl acrylate 12 parts, methyl acrylate 25 parts, functional monomer: 2-hydroxyethyl acrylate 5 parts, epoxy vinyl monomer: glycidyl methacrylate 3 parts, free radical initiator AIBN 0.2 parts, silane coupling agent KH570 0.5 parts, organic solvent ethyl acetate 150 parts.

[0069] The method for synthesizing acrylic ester copolymer is:

[0070] S1, under nitrogen atmosphere, the soft monomer, hard monomer, epoxy vinyl monomer, functional monomer and silane coupling agent are added into the reaction kettle in proportion by weight parts, stirred uniformly, heated to 70℃, then 1 / 4 of the total mass of free radical initiator is added, the polymerization reaction is started, and stirred for 2 hours;

[0071] S2, maintain 70℃, mix 1 / 3 amount of free radical initiator with 1 / 2 of the total mass of organic solvent, then add to the reaction system dropwise, dropwise addition is completed within 1.5 hours, then keep warm for 2 hours;

[0072] S3, add the remaining free radical initiator, heat to 85℃, react for 3 hours;

[0073] S4, after the reaction is completed, the remaining organic solvent is added to dilute the product, to obtain acrylic ester copolymer; its solid content is 40%, weight average molecular weight is 75W, glass transition temperature is -20℃.

[0074] A water-cooled tube insulation film is prepared by the following method:

[0075] (1) 100 parts of acrylic ester copolymer, 0.5 parts of curing agent L-75, 15 parts of hydrogenated rosin resin, 5 parts of terpene phenol resin, 30 parts of organic solvent (ethyl acetate) are mixed, stirred uniformly, to obtain high viscosity weather-resistant adhesive for water-cooled tube insulation film;

[0076] (2) the adhesive is uniformly coated on a 50 μm thick release film, the dry adhesive thickness is controlled to be 50 μm, after drying at 110℃ for 5 min to remove the solvent, the adhesive surface is laminated with PETG film, and the adhesive is cured at 40℃ for 3 days, to obtain the water-cooled tube insulation film.

[0077] Comparative Example 1

[0078] The example is identical to Example 1, except that in this example, 1 part of silane coupling agent KH560 is added in the preparation of the high-adhesion weather-resistant adhesive for water-cooling pipe insulation film in step (1).

[0079] Comparative Example 2

[0080] The example is identical to Example 1, except that in this example, the raw material for synthesizing the acrylate copolymer does not include glycidyl methacrylate.

[0081] The acrylate copolymer obtained in this example has a solid content of 41.5%, a weight average molecular weight of 78 W, and a glass transition temperature of -24°C.

[0082] Comparative Example 3

[0083] The example is identical to Example 1, except that in this example, the amount of 2-hydroxyethyl acrylate in the raw material for synthesizing the acrylate copolymer is increased to 8 parts by weight.

[0084] Comparative Example 4

[0085] The example is identical to Example 1, except that in this example, the amount of hydrogenated rosin resin in the raw material for synthesizing the high-adhesion weather-resistant adhesive for water-cooling pipe insulation film is increased to 18 parts by weight, and the amount of terpene phenol resin is increased to 8 parts by weight.

[0086] Comparative Example 5

[0087] The example is identical to Example 1, except that in this example, no silane coupling agent KH570 is added in the raw material for synthesizing the acrylate copolymer, and 1 part by weight of KH550 is added in the preparation of the high-adhesion weather-resistant adhesive for water-cooling pipe insulation film in step (1).

[0088] The acrylate copolymer obtained in this example has a solid content of 39.5%, a weight average molecular weight of 77 W, and a glass transition temperature of -23°C.

[0089] Comparative Example 6

[0090] The example is identical to Example 1, except that in this example, no silane coupling agent KH570 is added in the raw material for synthesizing the acrylate copolymer, and 1 part by weight of N-β-(aminoethyl)-γ-aminopropyl trimethoxysilane (KH-792) is added in the preparation of the high-adhesion weather-resistant adhesive for water-cooling pipe insulation film in step (1).

[0091] The acrylate copolymer obtained in this example has a solid content of 41.0%, a weight average molecular weight of 79 W, and a glass transition temperature of -23°C.

[0092] Comparative Example 7

[0093] The example is the same as example 1, the difference is that in this example, the raw material for synthesizing the acrylate copolymer does not add the epoxy vinyl monomer GMA, and 5 parts of the epoxy resin NPES-901 (Nanya Epoxy Resin) is added when preparing the high-viscosity weather-resistant adhesive for water-cooled tube insulation film in step (1), and the dilution ratio of ethyl acetate to epoxy resin NPES-901 is 1:2.

[0094] The solid content of the acrylate copolymer obtained in this example is 39.1%, the weight average molecular weight is 74W, and the glass transition temperature is -23°C.

[0095] Comparative Example 8

[0096] The example is the same as example 1, the difference is that in this example, the raw material for synthesizing the acrylate copolymer does not add the epoxy vinyl monomer GMA, and the functional monomer 2-hydroxyethyl acrylate is changed to acrylic acid, and the amount is unchanged.

[0097] The solid content of the acrylate copolymer obtained in this example is 43.5%, the weight average molecular weight is 81W, and the glass transition temperature is -21°C.

[0098] Comparative Example 9

[0099] The example is the same as example 1, the difference is that in this example, the mixture of 15 parts by weight of hydrogenated rosin resin and 5 parts by weight of terpene phenol resin in step (1) for preparing the high-viscosity weather-resistant adhesive for water-cooled tube insulation film is changed to single addition of 20 parts by weight of terpene phenol resin.

[0100] The insulation films prepared in example 1 and comparative examples 1-9 are tested for performance, and the test methods are as follows:

[0101] (1) 180° peeling force test: the insulation film is attached to a 3003 aluminum plate, and is left at room temperature for 20 minutes, and is tested according to ASTM-D3330 standard, greater than 3500N / 25mm

[0102] (2) High voltage resistance test, breakdown voltage before aging > 11Kv, leakage current < 10uA

[0103] (3) Insulation performance test: 1000VDC@60s, insulation resistance ≥ 500MΩ

[0104] (4) High temperature and high humidity resistance test: the PETG insulation film is attached to the water-cooled tube of the cylindrical battery, and is bent after the diameter of the cylindrical battery, and is placed in 85°C / 85% humidity, -40°C-85°C high and low temperature aging for 1000h, the film surface and aluminum plate bonding force is good, and the 3500VDC leakage current test is less than or equal to 10uA, and the breakdown voltage is ≥ 8Kv

[0105] (5) Insulating film sample peel strength performance test after aging for 1000h: after taking out from the aging oven, the sample was placed at room temperature for 2h, and then peel strength test was performed at 180℃.

[0106] The test results are shown in Table 1 below:

[0107] Table 1

[0108]

[0109]

[0110] According to the test results in Table 1, it can be found from Example 1 and Comparative Examples 1-4 that the silane coupling agent can have good aging resistance when introduced by polymerization, and the performance after aging decreases slightly when added by mixing or in the formulation section. It can be found from Example 1, Comparative Example 2, and Comparative Example 7 that the introduction of epoxy structure in the copolymer synthesis section can effectively improve the shear strength, and the introduction of epoxy resin in the formulation section to form a mutual network blending structure has little effect on the shear strength,

[0111] Comparative Example 3: Although the peel strength can be improved within a certain range by increasing the amount of polar monomer, the shear force and peel strength after aging cannot be considered;

[0112] Comparative Example 4: The use of tackifying resin beyond a certain range is not conducive to improving the aging performance, and the tackifying resin has the risk of precipitation when the sample is exposed to high temperature and humidity for a long time, and the peel strength after aging has a decreasing trend;

[0113] Comparative Example 8: The functional monomer is replaced by acrylic acid, and the performance after curing decreases, the reason is that the polarity of carboxyl group is slightly stronger, and the effect on the performance of aluminum plate is smaller;

[0114] Comparative Example 9: Although terpene phenol resin can significantly improve the adhesion of the adhesive, if used alone in large quantities, it may cause the cohesive force of the adhesive layer to decrease, making the adhesive layer prone to internal cracking or peeling from the substrate when subjected to large external forces or long-term stress. In contrast, the addition of rosin can improve the toughness of the adhesive layer and help maintain good cohesive force, thereby maintaining high adhesion while ensuring the strength of the adhesive layer itself

[0115] The insulating film provided by the application significantly enhances the bonding performance and aging performance of materials such as aluminum plates. The examples described in the text illustrate the specific implementation of the application, and are intended to illustrate and not limit the application scope.

[0116] While embodiments of the application have been disclosed in connection with the preferred embodiments of the application, it should be understood that there can be other embodiments which fall within the broad concept of the application as defined in the claims and their equivalents.

Claims

1. A high-adhesion, weather-resistant adhesive for insulating films of water-cooled pipes, characterized in that, Includes the following raw material components by weight: 100 parts acrylate copolymer, 0.1-1 part curing agent, 5-20 parts rosin resin and terpene phenol resin mixture, 15-60 parts organic solvent; The raw materials for synthesizing acrylate copolymers include, by weight: 40-70 parts of soft monomer, 15-30 parts of hard monomer, 1-5 parts of epoxy vinyl monomer, 3-6 parts of functional monomer, 0.5-1 part of free radical initiator, 0.5-1 part of silane coupling agent, and 100-200 parts of organic solvent. The hard monomer is a mixture of isobornyl acrylate and methyl acrylate; The functional monomer is 2-hydroxyethyl acrylate.

2. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The soft monomer is selected from one or more of isooctyl acrylate, n-butyl acrylate, ethyl acrylate, and lauryl acrylate.

3. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The epoxy vinyl monomer is glycidyl methacrylate.

4. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The silane coupling agent is selected from one or more of γ-methacryloxypropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and γ-glycidoxypropyltrimethoxysilane; The free radical initiator is one or both of azobisisobutyronitrile and benzoyl peroxide; The organic solvent is selected from one or more of ethyl acetate, toluene, and butanone.

5. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The acrylate copolymer was prepared by the following method: S1. Under an inert atmosphere, the soft monomer, hard monomer, epoxy vinyl monomer, functional monomer and silane coupling agent are added to the reactor, stirred evenly, heated to 70°C, and then 1 / 4 of the total mass of free radical initiator is added and stirred for 2 hours. S2. Maintain 70°C, mix 1 / 3 of the total mass of the free radical initiator with some organic solvent and add it dropwise to the reaction system. The addition should be completed within 1.5 hours, and then keep the temperature for 1-2 hours. S3. Add the remaining free radical initiator, heat to 85°C, and react for 3 hours; S4. After the reaction is complete, the remaining organic solvent is added to dilute the product, thereby obtaining the acrylate copolymer.

6. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 5, characterized in that, The acrylate copolymer has a solid content of 30%-40%, a weight-average molecular weight of 50-100W, and a glass transition temperature of -35℃ to -10℃.

7. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The rosin resin is selected from one or more of 138, 145, Foral 105-E, Foral 85, Foralyn 110, and WR-D135; The terpene phenolic resin is selected from one or more of 1160, WTPR-801L, WTPR-3603, and WTPR-803L; The curing agent is selected from one or more of XR-100, GA-240, L-75, and L-45.

8. The high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film according to claim 1, characterized in that, The mass ratio of rosin resin to terpene phenol resin is 2:1-4:

1.

9. A method for preparing a high-viscosity, weather-resistant adhesive for water-cooled pipe insulation film as described in any one of claims 1-8, characterized in that, Includes the following steps: An acrylate copolymer, a curing agent, a mixture of rosin resin and terpene phenol resin, and an organic solvent are mixed and stirred until homogeneous to obtain the high-viscosity, weather-resistant adhesive for the insulating film of the water-cooled pipe.

10. An insulating film for water-cooled pipes, characterized in that, It is prepared by the following method: the water-cooled pipe insulation film according to any one of claims 1-8 is uniformly coated on the release film with a high-viscosity weather-resistant adhesive, dried to remove the solvent, and then the adhesive surface is bonded to the PETG film and cured to obtain the water-cooled pipe insulation film.

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