Sound insulation adhesive film as well as preparation method and application thereof

Abstract

The invention discloses a sound insulation adhesive film and a preparation method and application thereof, and relates to the field of sound insulation materials. The sound insulation adhesive film comprises the following components in parts by weight: 90-100 parts of matrix resin; 23-30 parts of a plasticizer; 5-10 parts of a grafting agent; the grafting agent is selected from isocyanate uracil dimer; the mass content of hydroxyl in the matrix resin is 18-21% in percentage by weight, so that the vibration energy absorption capacity of the sound insulation adhesive film can be remarkably improved, the sound insulation effect is improved, and the impact resistance of the sound insulation adhesive film is improved.

Description

Technical Field

[0001] The present invention relates to the field of sound insulation materials, and in particular to a sound insulation film, a preparation method thereof, and applications thereof. Background Art

[0002] The ever-increasing number of people, vehicles, and various commercial buildings in cities has led to increasingly louder noise levels on city streets. To improve the quality of life of urban residents, it is imperative to use sound insulation materials to reduce or isolate noise. For example, polyvinyl butyral (PVB) film, as an important interlayer material, is widely used in laminated glass, solar cell encapsulation, and building sound insulation. However, the performance of PVB film in sound insulation applications still needs to be improved. Although traditional PVB film can provide a certain sound insulation effect, its damping performance is poor within a specific temperature range. In particular, when the ambient temperature is below or above its glass transition temperature (Tg), the damping performance of the film will drop significantly, thereby affecting its sound insulation performance. Therefore, commercial sound insulation PVB film usually adopts a three-layer structure. The middle layer is added with a high content of plasticizer to lower the glass transition temperature, thereby widening the damping temperature range and improving the sound insulation effect. However, this sound insulation PVB film has the following problems: high concentration of plasticizers easily migrates in the PVB film, resulting in unstable mechanical properties of the middle layer. After long-term use, the sound insulation performance and impact resistance of the film decrease. Summary of the Invention

[0003] The main purpose of the present invention is to provide a sound insulation film and a preparation method and application thereof, so as to solve the problem of poor sound insulation effect of the sound insulation film in the prior art.

[0004] In order to achieve the above object, according to a first aspect of the present invention, there is provided a sound insulation film comprising the following components in parts by weight:

[0005] 90-100 parts of base resin;

[0006] 23-30 parts of plasticizer;

[0007] 5-10 parts of grafting agent;

[0008] The grafting agent is selected from isocyanate uracil dimer; and the mass content of hydroxyl groups in the base resin is 18% to 21% by weight.

[0009] Furthermore, the grafting agent is obtained by reacting a diisocyanate compound and a pyrimidine compound;

[0010] Preferably, the molar ratio of the diisocyanate compound to the pyrimidine compound is 1:(6-10);

[0011] Preferably, the pyrimidine compound has 4 or more heteroatoms, and the heteroatoms are nitrogen atoms and / or oxygen atoms;

[0012] Preferably, the diisocyanate compound is selected from one or more of trimethylhexamethylene diisocyanate, L-lysine diisocyanate, hexamethylene diisocyanate, and 1,5-diisocyanatopentane;

[0013] Preferably, the pyrimidine compound is selected from one or more of 2-dimethylamino-4-amino-6-hydroxypyrimidine, 6-hydroxy-2,4,5-triaminopyrimidine, 2-amino-4-hydroxy-6-methylpyrimidine, 2-amino-5-butyl-6-methylpyrimidin-4(3H)-one, and 2-amino-5-(2-hydroxyethyl)-6-methyl-1H-pyrimidin-4-one.

[0014] Furthermore, the matrix resin is selected from one or more of PVB resin, TPU resin, and EVOH resin.

[0015] Furthermore, the mass content of butyral groups in the PVB resin is 78% to 82%, and the mass content of acetyl groups is 1% to 2%.

[0016] Furthermore, the number average molecular weight of the matrix resin is 150,000 to 300,000.

[0017] Furthermore, the plasticizer is selected from one or more of dioctyl sebacate, triethylene glycol diisooctanoate, dibutyl adipate, diisobutyl adipate, dipropyl adipate, diisopropyl adipate, dimethoxyethylene glycol phthalate, tricresyl phosphate, dipropylene glycol phthalate, triethylene glycol dipelargonate, and coumarone-indene resin.

[0018] Furthermore, the sound insulation film also includes an antioxidant;

[0019] Preferably, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168; more preferably, the weight portion of the antioxidant is 0.2 to 0.5 parts.

[0020] Furthermore, the sound insulation film also includes an anti-ultraviolet agent. Preferably, the anti-ultraviolet agent is selected from one or more of UV-326, UV-329, UV-328, UV-123, and UV-531; more preferably, the weight portion of the anti-ultraviolet agent is 0.2 to 0.4 parts.

[0021] The second aspect of the present invention provides a method for preparing the sound insulation film of the first aspect, comprising the following steps: mixing a base resin, a plasticizer, and a grafting agent to obtain a mixture; extruding and casting the mixture to obtain a sound insulation film; or

[0022] The base resin modified by the grafting agent and the plasticizer are mixed to obtain a mixture; the mixture is extruded and cast to obtain a sound insulation film;

[0023] Preferably, the extrusion casting method is as follows: the mixed material is conveyed from the feed port of the twin-screw extruder to the conveying section, and after preheating, a preheated material is obtained; the preheated material enters the compression section, and after compression, a compressed material is obtained; the compressed material enters the homogenization section, and after uniform mixing, a hot melt adhesive is obtained; the hot melt adhesive is added to the casting machine and cast to obtain the sound insulation film;

[0024] Among them, the temperature of the conveying section is 125℃~135℃, the temperature of the compression section is 145℃~155℃, and the temperature of the homogenization section is 145℃~155℃.

[0025] According to a third aspect of the present invention, there is provided a sound insulation device comprising the above-mentioned sound insulation film or the sound insulation film prepared by the above-mentioned method for preparing the sound insulation film.

[0026] By applying the technical solution of the present invention, by introducing isocyanate uracil dimers as grafting agents, multiple hydrogen bonds are formed between uracil dimers and between uracil dimers and hydroxyl groups on the matrix resin molecular chain, which can significantly increase the damping of the film (i.e., the ability to absorb vibration energy), improve the sound insulation effect, and enhance the sound insulation performance and impact resistance of the sound insulation film during long-term use. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0028] As described in the background art, the prior art has the problem of poor sound insulation effect of sound insulation films. To solve the above problem, according to a first aspect of the present invention, a sound insulation film is provided, which comprises the following components in parts by weight:

[0029] 90-100 parts of base resin;

[0030] 23-30 parts of plasticizer;

[0031] 5-10 parts of grafting agent;

[0032] The grafting agent is selected from isocyanate uracil dimer; and the mass content of hydroxyl groups in the base resin is 18% to 21% by weight.

[0033] Isocyanate uracil dimers can be used as hydrogen bond crosslinkers and grafted onto the molecular chain of the matrix resin through chemical reactions. The hydroxyl value of the matrix resin is controlled between 18% and 21%. The hydroxyl content within this specific range helps to optimize the toughness and bonding properties of the material while maintaining good transparency and optical properties. By controlling the hydroxyl value of the matrix resin within the above range, it helps to achieve the best grafting effect, thereby affecting the mechanical properties and sound insulation properties of the final product. Plasticizers can improve the flexibility and elongation of the film while lowering the glass transition temperature (Tg), which is beneficial to broaden the material's operating temperature range and enhance sound insulation performance. The grafting agent is an isocyanate uracil dimer. This type of compound reacts with the hydroxyl group on the molecular chain of the matrix resin through the isocyanate group to form a stable grafted structure.

[0034] Isocyanate compounds have an -NCO (isocyanate) functional group, while uracil compounds are compounds composed of urea (-NH-CO-NH-) and a pyrimidine ring (a six-membered heterocyclic ring containing two nitrogen atoms) structure. When these two types of compounds undergo a chemical reaction, a new molecule containing a urea bond and a pyrimidine unit can be formed. This molecule is called an isocyanate uracil dimer. When the isocyanate uracil dimer reacts with the hydroxyl group on the molecular chain of the matrix resin, it can be grafted onto the main chain of the matrix resin to form new chemical bonds and physical cross-linking points. This grafting effect not only enhances the interaction between molecular chains, but also forms a local high-density hydrogen bond area inside the film through microphase separation, thereby improving the impact resistance and sound insulation properties of the material.

[0035] Due to the unique molecular structure of isocyanate uracil dimers, they can form and break hydrogen bonds under different temperature conditions, achieving so-called "dynamic crosslinking." At processing temperatures (such as 150°C), hydrogen bonding is weak and does not affect the material's processing properties. However, at room temperature or lower, hydrogen bonding forces strengthen, forming a stable physical network that helps improve the mechanical strength and elastic modulus of the sound insulation film.

[0036] Isocyanate-based uracil dimers not only improve the thermal stability of the material but also form multiple hydrogen bonds between them and with the main chain of the matrix resin, achieving dynamic physical crosslinking, thereby enhancing the film's impact resistance and sound insulation. The grafting of isocyanate-based uracil dimers modulates the density and strength of hydrogen bonds, forming a microphase separation structure—localized regions of high and low hydrogen bond density—in the sound-insulating film. This microphase separation enhances the film's internal energy dissipation capacity, particularly along the sound wave propagation path, effectively absorbing and dispersing sound wave energy and significantly improving sound insulation.

[0037] Therefore, the sound-insulating film of the present invention, by controlling the base resin to have a specific hydroxyl content and introducing an isocyanate-based uracil dimer, allows an in-situ hydroxyl reaction to graft the isocyanate-based uracil dimer onto the base resin's molecular chain. This formation of multiple hydrogen bonds between the isocyanate-based uracil dimers and between the isocyanate-based uracil dimers and the hydroxyl groups on the base resin's molecular chain significantly increases the film's damping (i.e., its ability to absorb vibration energy), improving its sound insulation performance. Furthermore, a high hydroxyl content increases the polarity of the system, which reduces the compatibility of the plasticizer and facilitates its precipitation. This not only facilitates a high grafting rate, thereby improving the sound insulation effect, but also provides high compatibility with the plasticizer, improving the processing properties and mechanical strength of the sound-insulating film. Furthermore, the grafting of isocyanate uracil dimers not only improves the damping properties of the sound insulation film but also achieves microphase separation by forming localized high-density hydrogen bond regions and low-density hydrogen bond regions, contributing to improved impact resistance. During impact, these localized high-density hydrogen bond regions absorb more impact energy, reducing damage to the film's overall structure and thus enhancing its toughness. Furthermore, the isocyanate uracil dimers form multiple hydrogen bonds with each other and with the hydroxyl groups on the matrix resin molecular chains, creating strong physical crosslinking. This results in high mechanical strength and elastic modulus for the film. Furthermore, the grafted matrix resin exhibits excellent thermal stability and is not susceptible to degradation and chain scission during processing, resulting in excellent processability and facilitating the casting of the sound insulation film. Finally, the scale of action of the isocyanate uracil dimer is at the submicron level. Therefore, even at a high grafting density, it does not affect the transmittance and haze of the sound insulation film, nor does it affect the visual transparency of the sound insulation film, which is crucial for many applications (such as construction and automotive glass). The sound insulation film of the present invention has good sound insulation effect, mechanical properties and visual transparency. Based on the technical solution of the embodiment of the present invention, first, the isocyanate uracil dimer (UPy) in the grafted modified base resin can form multiple hydrogen bonds with the hydroxyl groups on the base resin molecular chain that are not involved in the grafting reaction, which can significantly improve the ability of the sound insulation film to absorb vibration energy, improve the sound insulation effect and enhance the impact resistance of the sound insulation film. In addition, controlling the hydroxyl content on the base resin to 18% to 21%, and the grafting rate of the base resin to 0.1% to 10%, can significantly improve the ability of the sound insulation film to absorb vibration energy and obtain better sound insulation effect and impact resistance. If the grafting ratio of the matrix resin exceeds the above range, the matrix resin will have poor fluidity and be prone to crystallization during the preparation of the sound insulation film, resulting in poor sound insulation and mechanical properties. A low grafting ratio will reduce the amount of hydrogen bonding in the film, resulting in poor sound insulation and mechanical properties. Furthermore, the polarity of the film system affects the compatibility of the plasticizer and the grafted matrix resin. Excessive hydroxyl content increases the polarity of the film system and easily causes plasticizer precipitation.By controlling the amount of plasticizer and graft-modified base resin, and controlling the hydroxyl content on the base resin to 18% to 21%, the film system has a high compatibility with the plasticizer, thereby avoiding the precipitation of the plasticizer from the graft-modified base resin, and improving the sound insulation performance and impact resistance of the sound insulation film during long-term use.

[0038] In some embodiments, the sound insulation film has a characteristic of tanδ ≥ 0.2 in the range of -10℃ to 45℃. Tanδ refers to the loss factor, which is a key parameter for measuring the energy loss capacity of a material, especially used to evaluate the damping performance of a material in dynamic mechanical analysis. The higher the tanδ value, the greater the proportion of energy converted into heat energy when the material is subjected to vibration or sound wave energy, that is, the better the damping performance of the material. By controlling the sound insulation film to maintain a tanδ value greater than or equal to 0.2 in the range of -10℃ to 45℃, it means that the sound insulation film has very good energy absorption and conversion capabilities in this temperature range of -10℃ to 45℃, and can effectively absorb and reduce the energy of sound in a wide range of ambient temperatures, thereby providing a continuous sound insulation effect. Secondly, it shows that the sound insulation film can maintain stable damping performance even in low temperature environments (such as outdoors in winter) or high temperature environments (such as strong sunlight indoors in summer), and is not easily degraded due to temperature changes. The sound insulation film exhibits excellent damping performance over a wide temperature range.

[0039] Specifically, the grafting agent is formed by reacting a compound containing an isocyanate group (such as a diisocyanate) with a hydrogen bond donor (such as an amino group and a hydroxyl group) on a pyrimidine (i.e., the isocyanate group reacts with the amino group to form a urea bond, while the isocyanate group reacts with the hydroxyl group to form a carbamate bond). In this process, the two -NCO groups of the diisocyanate react with the hydrogen bond donors on two pyrimidine molecules to form two urea groups, thereby connecting the two pyrimidine molecules together to form a dimer structure.

[0040] In some embodiments, the grafting agent is obtained by reacting a diisocyanate compound and a pyrimidine compound. Specifically, the pyrimidine compound and the diisocyanate compound are mixed, heated under reflux to 95°C to 105°C for 18h to 22h, and after cooling to room temperature, the product is precipitated. After filtering, washing, and drying, the grafting agent is obtained.

[0041] In some embodiments, the pyrimidine compound has four or more heteroatoms, wherein the heteroatoms are nitrogen atoms and / or oxygen atoms. When the pyrimidine compound has four or more nitrogen atoms and / or oxygen atoms, the density of hydrogen bonds formed between uracil dimers and between uracil dimers and hydroxyl groups on the molecular chains of the matrix resin (especially PVB) is high, resulting in better sound insulation.

[0042] In one embodiment, the molar ratio of the diisocyanate compound to the pyrimidine compound is (1:6-10). The above ratio is conducive to obtaining a higher yield of diisocyanate uracil dimer and reaction efficiency.

[0043] In one embodiment, the diisocyanate compound is selected from one or more of trimethylhexamethylene diisocyanate, L-lysine diisocyanate, hexamethylene diisocyanate, and 1,5-diisocyanatopentane.

[0044] In one embodiment, the pyrimidine compound is selected from one or more of 2-dimethylamino-4-amino-6-hydroxypyrimidine, 6-hydroxy-2,4,5-triaminopyrimidine, 2-amino-4-hydroxy-6-methylpyrimidine, 2-amino-5-butyl-6-methylpyrimidin-4(3H)-one, and 2-amino-5-(2-hydroxyethyl)-6-methyl-1H-pyrimidin-4-one.

[0045] In one embodiment, the diisocyanate compound and the pyrimidine compound are refluxed at 110° C. to 130° C. for 12 h to 24 h to obtain a diisocyanate uracil dimer, which is beneficial for obtaining a higher yield of the diisocyanate uracil dimer and reaction efficiency.

[0046] In order to obtain a diisocyanate uracil dimer of higher purity, in one embodiment, the system after reflux is washed with n-pentane, and then the solvent is removed by distillation under reduced pressure to obtain the diisocyanate uracil dimer.

[0047] In some embodiments, the base resin is selected from one or more of PVB resin, TPU resin, and EVOH resin. Based on the technical solutions of the embodiments of the present invention, the hydroxyl groups on the base resin can react with the isocyanate groups on a uracil dimer having at least one isocyanate group to form a grafted modified base resin. The use of PVB, TPU, and EVOH with the above-mentioned specific hydroxyl content is conducive to obtaining a high grafting rate to improve the sound insulation effect, and has high compatibility with plasticizers, thereby improving the processing performance and mechanical strength of the sound insulation film. The grafting rate of the base resin is preferably 5% to 8%, and the hydroxyl content on the base resin is controlled to be 18% to 21%. The grafting rate of the base resin is also controlled to be 5% to 8%, which is more conducive to improving the ability to absorb vibration energy and obtaining better sound insulation and impact resistance.

[0048] Furthermore, the content of butyral groups in the PVB resin is 78% to 82%, and the content of acetyl groups is 1% to 2%. Based on the technical solution of the embodiment of the present invention, PVB is prepared by reacting polyvinyl alcohol (PVA) with butyraldehyde under acidic conditions. Polyvinyl alcohol is usually polyvinyl acetate obtained by polymerization of vinyl acetate monomer. Polyvinyl acetate then undergoes partial hydrolysis to convert acetate groups (-COOCH3) into hydroxyl groups, thereby obtaining PVA. This process is usually not 100% complete, and some acetate groups will remain during the hydrolysis process and become acetyl groups in the polyvinyl alcohol structure. During the processing of the sound insulation film, acetyl groups easily fall off to form acetic acid, which catalyzes the degradation of the matrix resin molecular chain. At the above acetyl group content, it is conducive to obtaining a sound insulation film with high thermal stability and good mechanical properties. Butyral groups are formed by the reaction of butyraldehyde and hydroxyl groups. When the butyral group content of the flexible molecular chain is 80% to 82%, the sound insulation film has good cold resistance and flexibility.

[0049] Furthermore, the number average molecular weight of the matrix resin is 150,000 to 300,000. Based on the technical solution of the embodiment of the present invention, the number average molecular weight of the matrix resin is within the above range, the melt fluidity is good, and the processing performance is better. The prepared sound insulation film has high tensile strength, elongation at break, and penetration resistance, and has good creep resistance during actual use.

[0050] Furthermore, the plasticizer is selected from one or more of dioctyl sebacate, triethylene glycol diisooctanoate, dibutyl adipate, diisobutyl adipate, dipropyl adipate, diisopropyl adipate, dimethoxyethylene glycol phthalate, tricresyl phosphate, dipropylene glycol phthalate, triethylene glycol dipelargonate, and coumarone-indene resin. Based on the technical solution of the embodiment of the present invention, the above-mentioned plasticizer is conducive to reducing the cohesive force between the graft-modified matrix resin molecules, weakening the interaction force between the molecular chains, so that the graft-modified matrix resin can also maintain good fluidity at a lower temperature, is convenient for extrusion and cast molding, and improves the processability of the graft-modified matrix resin. The use of the above-mentioned plasticizer can also increase the flexibility of the graft-modified matrix resin, making it less prone to brittle cracking at low temperatures, and improving its impact resistance.

[0051] In some embodiments, the sound insulation film also includes one or more antioxidants and UV inhibitors. Based on the technical solutions of the embodiments of the present invention, the addition of antioxidants helps protect the sound insulation film from oxidation during processing and use, particularly oxidation reactions caused by high temperatures, light, or exposure to oxygen in the air, thereby improving the long-term performance stability and service life of the insulation film. The function of UV inhibitors in sound insulation films is primarily to protect the film from damage caused by ultraviolet radiation by absorbing, reflecting, or scattering ultraviolet rays, thereby reducing polymer chain breakage, color changes, and strength loss caused by ultraviolet rays.

[0052] In one embodiment, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168. These antioxidants are highly effective and compatible with base resins such as PVB, effectively inhibiting oxidation and protecting the film's structure and properties. To achieve a sound insulation film with superior mechanical properties and a long service life, the antioxidant content is preferably 0.2 to 0.5 parts by weight.

[0053] In one embodiment, the anti-UV agent is selected from one or more of UV-326, UV-329, UV-328, UV-123, and UV-531. These agents are highly effective at absorbing UV rays and exhibit good dispersibility and stability in matrix resins such as PVB. They provide UV protection while maintaining the transparency of the release film. To achieve a sound insulation film with high mechanical properties and transparency, the anti-UV agent is preferably present in an amount of 0.2 to 0.4 parts by weight.

[0054] According to a second aspect of the present invention, a method for preparing the above-mentioned sound insulation film is provided, comprising the following steps: mixing a base resin, a plasticizer and a grafting agent to obtain a mixture; extruding and casting the mixture to obtain a sound insulation film; or, mixing a base resin modified by a grafting agent and a plasticizer to obtain a mixture; extruding and casting the mixture to obtain a sound insulation film.

[0055] In particular, after mixing the base resin, plasticizer, and grafting agent to obtain a mixture, the mixture is extruded and cast to obtain a sound insulation film. The raw material mixing and extrusion and casting processes can also be carried out using the existing sound insulation film preparation processes. In some specific embodiments, the sound insulation film can be obtained by melt extrusion and casting through a twin-screw extruder. During the extrusion process, the grafting agent reacts with the hydroxyl groups on the molecular chain of the base resin, thereby grafting onto the molecular chain of the base resin. At the above temperature, the base resin can be grafted, and the grafted base resin has good processing properties, which facilitates the casting of the sound insulation film, thereby improving the production efficiency and cost-effectiveness of the sound insulation film.

[0056] After mixing the base resin modified by the grafting agent and the plasticizer to obtain a mixture; in the process of preparing the sound insulation film by extrusion casting of the mixture, the base resin modified by the grafting agent can be obtained by pre-preparation.

[0057] In some embodiments, the base resin modified with the grafting agent can be prepared by the following method: mixing the base resin with an organic solvent under a nitrogen atmosphere and heating to 75°C to 85°C to obtain a base resin solution; mixing the grafting agent with the organic solvent to obtain a grafting agent solution; slowly adding the grafting agent solution dropwise to the base resin solution and refluxing at 95°C to 105°C for 20 hours to 40 hours to obtain a reaction solution; and drying the reaction solution to obtain the base resin modified with the grafting agent. The organic solvent can be dimethylformamide.

[0058] In some embodiments, the mixed material is conveyed from the feed port of the twin-screw extruder to the conveying section, and after preheating, a preheated material is obtained; the preheated material enters the compression section, and after compression, a compressed material is obtained; the compressed material enters the homogenization section, and after uniform mixing, a hot melt adhesive is obtained; the hot melt adhesive is added to a casting machine and cast to obtain a sound insulation film.

[0059] The temperature in the conveying section is 125°C to 135°C, which initiates the initial heating and pre-melting of the mixture. The relatively low temperature in the conveying section is primarily to prevent premature melting, which could affect subsequent mixing and melting. The twin-screw extruder rotates at a lower speed in this section, propelling the mixture forward while initially breaking and dispersing it, forming a preheated material. The preheated material then enters the compression section, where the temperature reaches 145°C to 155°C. During this stage, the rotating screws of the twin-screw extruder increase pressure on the material, further softening and partially melting it, forming a compressed material. The compressed material then enters the homogenization section, where the temperature reaches 145°C to 155°C, completely melting and evenly mixing the material to form a hot-melt adhesive. This step ensures even distribution of the material components, thereby ensuring consistent sound insulation. The hot-melt adhesive is then fed into the casting machine, where it is formed into a sound-insulating film.

[0060] According to a third aspect of the present invention, a sound insulation device is provided, comprising the above-mentioned sound insulation film or the sound insulation film prepared by the above-mentioned method for preparing the sound insulation film.

[0061] The sound insulation device can be a soundproof window. By sticking the sound insulation film on the window, a soundproof window can be obtained. Soundproof windows can be used in the fields of construction, automobiles, rail transportation, aviation, ships, audio equipment, etc. For example, in the construction field, it can be used for soundproof windows in buildings to effectively reduce the impact of urban noise on the living environment; in the automotive field, it can be used for windows and interior decoration to significantly reduce wind noise and road noise during driving and improve the driving experience; in the rail transportation field, it can be used for train windows and compartments to reduce train operation noise and improve passenger comfort; in the aviation field, it can be used for aircraft windows and bulkheads to reduce noise during flight and improve the flight experience; in the ship field, it can be used for cabin partitions to reduce ship operation noise and improve living comfort; in the audio equipment field, it can be used for speakers and recording studios to improve sound quality, reduce noise, and make music purer.

[0062] The present application is further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0063] Example 1

[0064] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0065] 95 parts of base resin PVB;

[0066] Plasticizer dioctyl sebacate 26 parts;

[0067] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0068] 0.4 parts of antioxidant 1010;

[0069] 0.3 parts of UV-326 anti-ultraviolet agent;

[0070] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0071] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0072] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 6%.

[0073] Example 2

[0074] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0075] 90 parts of base resin PVB;

[0076] 30 parts of plasticizer triethylene glycol diisooctanoate;

[0077] 10 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0078] 0.5 parts of antioxidant 1076;

[0079] 0.4 parts of UV-329 anti-ultraviolet agent;

[0080] In terms of weight percentage, the base resin has a hydroxyl content of 18%, a butyral content of 78%, an acetyl content of 1%, and a number average molecular weight of 280,000.

[0081] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0082] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 7.2%.

[0083] Example 3

[0084] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0085] 100 parts of base resin PVB;

[0086] Plasticizer dibutyl adipate 23 parts;

[0087] 5 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0088] Antioxidant 168 0.2 parts;

[0089] 0.2 parts of UV-328 anti-ultraviolet agent;

[0090] Calculated by weight percentage, the hydroxyl content of the base resin is 21%, the butyral content is 82%, the acetyl content is 1%, and the number average molecular weight of the base resin is 180,000.

[0091] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0092] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 5.9%.

[0093] Example 4

[0094] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0095] 95 parts of matrix resin TPU;

[0096] Plasticizer dioctyl sebacate 26 parts;

[0097] 8 parts of an isocyanate uracil dimer, prepared by reacting 6-hydroxy-2,4,5-triaminopyrimidine and trimethylhexamethylene diisocyanate in a molar ratio of 8:1;

[0098] 0.4 parts of antioxidant 1010;

[0099] 0.3 parts of UV-326 anti-ultraviolet agent;

[0100] Calculated by weight percentage, the content of hydroxyl groups in the base resin is 20%, and the number average molecular weight of the base resin is 300,000.

[0101] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0102] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 5.2%.

[0103] Example 5

[0104] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0105] 95 parts of matrix resin TPU;

[0106] Plasticizer dioctyl sebacate 26 parts;

[0107] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 10:1;

[0108] 0.4 parts of antioxidant 1010;

[0109] 0.3 parts of UV-326 anti-ultraviolet agent;

[0110] Calculated by weight percentage, the content of hydroxyl groups in the base resin is 20%, and the number average molecular weight of the base resin is 150,000.

[0111] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0112] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 5.1%.

[0113] Example 6

[0114] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0115] 95 parts of base resin PVB;

[0116] Plasticizer dioctyl sebacate 26 parts;

[0117] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-amino-4-hydroxy-6-methylpyrimidine and 1,5-diisocyanatopentane in a molar ratio of 8:1;

[0118] 0.4 parts of antioxidant 1010;

[0119] 0.3 parts of UV-326 anti-ultraviolet agent;

[0120] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0121] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0122] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 5.5%.

[0123] Example 7

[0124] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0125] 95 parts of base resin PVB;

[0126] Plasticizer dioctyl sebacate 26 parts;

[0127] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0128] 0.4 parts of antioxidant 1010;

[0129] 0.3 parts of UV-326 anti-ultraviolet agent;

[0130] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0131] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0132] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 135°C, the temperature of the compression section is 155°C, and the temperature of the homogenization section is 155°C; the grafting rate of the base resin in the sound insulation film is 6.5%.

[0133] Example 8

[0134] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0135] 95 parts of base resin PVB;

[0136] Plasticizer dioctyl sebacate 26 parts;

[0137] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-amino-4-hydroxy-6-methylpyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0138] 0.4 parts of antioxidant 1010;

[0139] 0.3 parts of UV-326 anti-ultraviolet agent;

[0140] Calculated by weight percentage, the hydroxyl content of the base resin is 19%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0141] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0142] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 6.1%.

[0143] Example 9

[0144] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0145] 95 parts of base resin PVB;

[0146] Plasticizer dioctyl sebacate 26 parts;

[0147] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-amino-5-butyl-6-methylpyrimidin-4(3H)-one and L-lysine diisocyanate in a molar ratio of 8:1;

[0148] 0.4 parts of antioxidant 1010;

[0149] 0.3 parts of UV-326 anti-ultraviolet agent;

[0150] Calculated by weight percentage, the hydroxyl content of the base resin is 21%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0151] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0152] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 135°C, the temperature of the compression section is 155°C, and the temperature of the homogenization section is 155°C; the grafting rate of the base resin in the sound insulation film is 6.5%.

[0153] Example 10

[0154] The sound insulation film of this embodiment includes the following raw materials in parts by weight:

[0155] 95 parts of base resin PVB;

[0156] Plasticizer dioctyl sebacate 26 parts;

[0157] 8 parts of an isocyanate uracil dimer, prepared by reacting 6-hydroxy-2,4,5-triaminopyrimidine and L-lysine diisocyanate in a molar ratio of 6:1;

[0158] 0.4 parts of antioxidant 1010;

[0159] 0.3 parts of UV-326 anti-ultraviolet agent;

[0160] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0161] The method for preparing the sound insulation film of this embodiment includes the following steps:

[0162] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 4%.

[0163] Comparative Example 1

[0164] The sound insulation film of this comparative example comprises the following raw materials in parts by weight:

[0165] 95 parts of base resin PVB;

[0166] Plasticizer dioctyl sebacate 26 parts;

[0167] 3 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0168] 0.4 parts of antioxidant 1010;

[0169] 0.3 parts of UV-326 anti-ultraviolet agent;

[0170] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0171] The preparation method of the sound insulation film of this comparative example comprises the following steps:

[0172] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 0.08%.

[0173] Comparative Example 2

[0174] The sound insulation film of this comparative example comprises the following raw materials in parts by weight:

[0175] 95 parts of base resin PVB;

[0176] Plasticizer dioctyl sebacate 26 parts;

[0177] 15 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0178] 0.4 parts of antioxidant 1010;

[0179] 0.3 parts of UV-326 anti-ultraviolet agent;

[0180] Calculated by weight percentage, the hydroxyl content of the base resin is 20%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0181] The preparation method of the sound insulation film of this comparative example comprises the following steps:

[0182] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 13%.

[0183] Comparative Example 3

[0184] The sound insulation film of this comparative example comprises the following raw materials in parts by weight:

[0185] 95 parts of base resin PVB;

[0186] Plasticizer dioctyl sebacate 26 parts;

[0187] 4 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0188] 0.4 parts of antioxidant 1010;

[0189] 0.3 parts of UV-326 anti-ultraviolet agent;

[0190] Calculated by weight percentage, the hydroxyl content of the base resin is 14%, the butyral content is 80%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0191] The preparation method of the sound insulation film of this comparative example comprises the following steps:

[0192] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film. During the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 4.9%.

[0193] Comparative Example 4

[0194] The sound insulation film of this comparative example comprises the following raw materials in parts by weight:

[0195] 95 parts of base resin PVB;

[0196] Plasticizer dioctyl sebacate 26 parts;

[0197] 8 parts of an isocyanate uracil dimer, prepared by reacting 2-dimethylamino-4-amino-6-hydroxypyrimidine and hexamethylene diisocyanate in a molar ratio of 8:1;

[0198] 0.4 parts of antioxidant 1010;

[0199] 0.3 parts of UV-326 anti-ultraviolet agent;

[0200] Calculated by weight percentage, the hydroxyl content of the base resin is 30%, the butyral content is 69%, the acetyl content is 1%, and the number average molecular weight of the base resin is 210,000.

[0201] The preparation method of the sound insulation film of this comparative example comprises the following steps:

[0202] According to the above raw materials and proportions, the base resin, plasticizer, isocyanate uracil dimer, antioxidant and anti-ultraviolet agent are first mixed in a high-speed mixer, and then the mixed system is melt-extruded through a twin-screw extruder and cast into a film to obtain a sound insulation film; wherein, during the extrusion process, the temperature of the conveying section is 130°C, the temperature of the compression section is 150°C, and the temperature of the homogenization section is 150°C; the grafting rate of the base resin in the sound insulation film is 8%.

[0203] Performance testing methods

[0204] The sound insulation performance and impact resistance of the sound insulation films prepared in the examples and comparative examples were tested, as follows:

[0205] (1) Composite loss factor η: According to the free beam method test in GB / T 16406 "Bending resonance test method for damping performance of acoustic materials", the larger the loss factor, the better the damping performance of the material and the better the sound insulation performance.

[0206] (2) Tensile modulus: tested according to the method specified in JB / T 6544.

[0207] (3) Tensile strength and elongation at break: The test was carried out in accordance with the relevant test provisions of GB / T 1040.3. The test conditions were: temperature 20±2°C and humidity 40-60% RH.

[0208] (4) Grafting rate test: First, using n-hexane as the solvent, Soxhlet extraction was performed to separate the base resin, antioxidant, anti-UV agent, and plasticizer. The separated base resin was then dissolved in deuterated chloroform and tested using proton nuclear magnetic resonance (1H NMR). By comparing the integral of the CH protons on the UPy aromatic ring in the base resin with the integral of the CH3 protons on the butyral group, the molar ratio of UPy grafted onto the base resin, i.e., the grafting rate, can be calculated.

[0209] The test results are shown in Table 1.

[0210] Table 1

[0211]

[0212]

[0213] From the above description, it can be seen that compared to Comparative Examples 1 to 4, the sound insulation films prepared in Examples 1 to 10 of the present invention have a higher composite loss factor η (≥0.08), excellent damping properties, and good sound insulation and noise reduction. Furthermore, compared to Comparative Examples 1 to 4, the tensile modulus of the sound insulation films (0.1 GPa to 0.15 GPa) is significantly improved, demonstrating strong and tough properties with excellent impact and penetration resistance. These films can be composited with materials such as glass to enhance the overall impact and penetration resistance of the materials. Furthermore, the sound insulation films prepared in Examples 1 to 10 exhibit excellent tensile strength (21 MPa to 30 MPa) and elongation at break (260% to 400%).

[0214] Compared with Examples 1, 6, and 7, the grafting rate of the sound insulation film prepared in Comparative Example 1 on the base resin is only 0.08%, and its composite loss factor η, tensile modulus, tensile strength, and elongation at break are significantly reduced. The mechanical properties of the sound insulation film, such as sound insulation and noise reduction, impact resistance, and penetration resistance, are significantly reduced.

[0215] Compared with Examples 1, 6, and 7, the sound insulation film prepared in Comparative Example 2 has a grafting rate of 13% on the base resin, and its composite loss factor η and tensile modulus are significantly reduced, and the sound insulation and noise reduction, impact resistance, and penetration resistance of the sound insulation film are significantly reduced.

[0216] Compared with Examples 1, 8, and 9, the sound insulation film prepared in Comparative Example 3 using a base resin with a lower hydroxyl content has significantly reduced composite loss factor η, tensile modulus, tensile strength, and elongation at break. The mechanical properties of the sound insulation film, such as sound insulation and noise reduction, impact resistance, and penetration resistance, are significantly reduced.

[0217] Compared with Examples 1, 8, and 9, the sound insulation film prepared in Comparative Example 4 using a base resin with a higher hydroxyl content has significantly reduced composite loss factor η and tensile modulus, and the sound insulation and noise reduction, impact resistance, and penetration resistance of the sound insulation film are significantly reduced.

[0218] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sound insulation film, characterized in that: According to parts by weight, it includes the following components: 90-100 parts of base resin; 23-30 parts of plasticizer; 5-10 parts of grafting agent; The grafting agent is selected from isocyanate uracil dimer; and the mass content of hydroxyl groups in the base resin is 18% to 21% by weight.

2. The sound insulation film according to claim 1, characterized in that: The grafting agent is obtained by reacting a diisocyanate compound and a pyrimidine compound; Preferably, the molar ratio of the diisocyanate compound to the pyrimidine compound is 1:(6-10); Preferably, the pyrimidine compound has 4 or more heteroatoms, and the heteroatoms are nitrogen atoms and / or oxygen atoms; Preferably, the diisocyanate compound is selected from one or more of trimethylhexamethylene diisocyanate, L-lysine diisocyanate, hexamethylene diisocyanate, and 1,5-diisocyanatopentane; Preferably, the pyrimidine compound is selected from one or more of 2-dimethylamino-4-amino-6-hydroxypyrimidine, 6-hydroxy-2,4,5-triaminopyrimidine, 2-amino-4-hydroxy-6-methylpyrimidine, 2-amino-5-butyl-6-methylpyrimidin-4(3H)-one, and 2-amino-5-(2-hydroxyethyl)-6-methyl-1H-pyrimidin-4-one.

3. The sound insulation film according to claim 1 or 2, characterized in that: The matrix resin is selected from one or more of PVB resin, TPU resin and EVOH resin.

4. The sound insulation film according to claim 3, characterized in that: The mass content of butyral groups in the PVB resin is 78% to 82%, and the mass content of acetyl groups is 1% to 2%.

5. The sound insulation film according to claim 1 or 2, characterized in that: The number average molecular weight of the base resin is 150,000 to 300,000.

6. The sound insulation film according to claim 1 or 2, characterized in that: The plasticizer is selected from one or more of dioctyl sebacate, triethylene glycol diisooctanoate, dibutyl adipate, diisobutyl adipate, dipropyl adipate, diisopropyl adipate, dimethoxyethylene glycol phthalate, tricresyl phosphate, dipropylene glycol phthalate, triethylene glycol dipelargonate, and coumarone-indene resin.

7. The sound insulation film according to claim 1 or 2, characterized in that: The sound insulation film also includes an antioxidant; Preferably, the antioxidant is selected from one or more of antioxidant 1010, antioxidant 1076, and antioxidant 168; more preferably, the weight portion of the antioxidant is 0.2 to 0.5 parts.

8. The sound insulation film according to claim 1 or 2, characterized in that: The sound insulation film further includes an anti-ultraviolet agent. Preferably, the anti-ultraviolet agent is selected from one or more of UV-326, UV-329, UV-328, UV-123, and UV-531. More preferably, the weight portion of the anti-ultraviolet agent is 0.2 to 0.4 parts.

9. A method for preparing the sound insulation film according to any one of claims 1 to 8, characterized in that: The steps include: The base resin, plasticizer and grafting agent are mixed to obtain a mixture; the mixture is extruded and cast to obtain the sound insulation film; or The base resin modified by the grafting agent and the plasticizer are mixed to obtain a mixture; the mixture is extruded and cast to obtain the sound insulation film; Preferably, the extrusion casting method is as follows: the mixed material is conveyed from the feed port of the twin-screw extruder to the conveying section, and after preheating, a preheated material is obtained; the preheated material enters the compression section, and after compression, a compressed material is obtained; the compressed material enters the homogenization section, and after uniform mixing, a hot melt adhesive is obtained; Adding the hot melt adhesive into a casting machine and casting to obtain the sound insulation film; Wherein, the temperature of the conveying section is 125°C to 135°C, the temperature of the compression section is 145°C to 155°C, and the temperature of the homogenization section is 145°C to 155°C.

10. A sound insulation device, characterized in that: A sound insulation film comprising the sound insulation film according to any one of claims 1 to 8 or a sound insulation film prepared by the preparation method of the sound insulation film according to claim 9.

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