Polyvinyl butyral as well as preparation method and application thereof

Abstract

The invention provides polyvinyl butyral and a preparation method and application thereof, preparation raw materials of the polyvinyl butyral comprise polyvinyl alcohol with the alcoholysis degree of 70%-85% and an aldehyde compound, and the aldehyde compound comprises any one or a combination of at least two of heptanal, nonanal and capraldehyde. The polyvinyl butyral film has the advantages of high light transmittance, low haze, high elasticity and excellent sound insulation effect, and is suitable for application scenes of automobile windshields, building sound insulation glass and the like. The whole technological process is simple, controllable and suitable for large-scale industrial production.

Description

Technical Field

[0001] This invention belongs to the field of polyvinyl butyral (PVB) synthesis, and relates to a polyvinyl butyral, its preparation method and application. Background Technology

[0002] As the global automotive market continues to expand and consumers' demands for vehicle performance increase, automakers face more severe challenges, especially in improving in-car comfort and reducing energy consumption. A large sunroof, a common feature in automotive design, can increase natural light inside the vehicle, enhance the sense of space, and provide drivers and passengers with a better view.

[0003] However, the interlayer membrane of existing large sunroofs generally has insufficient sound insulation and heat insulation performance, which limits its widespread application in high-end models.

[0004] The Challenge of Sound Insulation: Cars traveling in cities and on highways often face environmental noise problems. These noises mainly originate from tire-road friction, aerodynamic wind noise, and external traffic noise. The impact of noise on drivers and passengers extends beyond comfort; it can also lead to fatigue during long drives, thus affecting driving safety. Traditional PVB interlayer membranes are typically made of a single material and lack sufficient acoustic damping, resulting in poor noise insulation. Therefore, a new type of interlayer membrane is urgently needed to effectively reduce sound transmission and improve the quietness of the vehicle interior.

[0005] The Challenge of Thermal Insulation Performance: Against the backdrop of climate change and energy conservation and emission reduction, the energy efficiency of automobiles is receiving increasing attention. While sunroofs can provide natural light, direct sunlight in summer can cause the interior temperature to rise rapidly, causing discomfort for passengers and increasing the load on the air conditioning system, thus leading to higher fuel consumption. Existing PVB interlayer films often fail to meet the required thermal insulation performance, easily resulting in excessively high interior temperatures. Therefore, improving the thermal insulation performance of PVB interlayer films not only helps improve passenger comfort but also helps reduce energy consumption, achieving better environmental protection results.

[0006] Insufficient sound insulation: Traditional PVB films typically use a single material and lack effective acoustic damping. When many vehicles are traveling at high speeds or on city roads, external noise can easily seep into the cabin, causing discomfort to passengers. In practical applications, noise pollution can affect driver concentration, thereby impacting driving safety.

[0007] Poor heat insulation: Due to the transparent nature of the large sunroof, direct sunlight can cause a significant increase in interior temperature, especially in summer, reducing the comfort of the driver and passengers. Existing PVB interlayer films often fail to effectively insulate heat, leading to increased strain on the air conditioning system and higher energy consumption.

[0008] Insufficient weather resistance: Existing materials may be affected by ultraviolet rays, moisture and temperature changes during long-term use, resulting in aging, discoloration and a decline in mechanical properties, which in turn affects their service life and safety.

[0009] Complex processing technology: The existing material preparation process is mostly single-layer casting, which is complex and requires high-end production equipment, making it unsuitable for large-scale production and application.

[0010] With the continuous advancement of automotive technology, intelligentization and environmental protection have become new trends in the automotive industry. Against this backdrop, developing higher-performance PVB interlayer films is particularly important. Developing a high-performance PVB film to meet the sound insulation and heat insulation requirements of automotive sunroofs has become an inevitable trend. Summary of the Invention

[0011] To address the shortcomings of existing technologies, the present invention aims to provide a polyvinyl butyral, its preparation method, and its application.

[0012] To achieve this objective, the present invention adopts the following technical solution:

[0013] On one hand, the present invention provides a polyvinyl butyral, wherein the raw materials for preparing the polyvinyl butyral include polyvinyl alcohol (PVA) with a degree of alcoholysis of 70%-85% and aldehyde compounds, wherein the aldehyde compounds include any one or a combination of at least two of heptanal, nonanal, and decanal.

[0014] In this invention, polyvinyl butyral prepared from polyvinyl alcohol (PVA) with a degree of alcoholysis of 70%-85% and high aldehyde compounds has high elasticity and damping properties.

[0015] In this invention, the degree of hydrolysis of the polyvinyl alcohol is 70%, 73%, 75%, 78%, 80%, 82%, or 85%, preferably 80%.

[0016] Preferably, the aldehyde compound is a combination of heptaldehyde and nonanaldehyde, and the molar ratio of heptaldehyde to nonanaldehyde is preferably 1:1.

[0017] Preferably, the mass ratio of polyvinyl alcohol (PVA) to aldehyde compound is 1:1.2-1:1.7, for example 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6 or 1:1.7.

[0018] Preferably, the raw materials for preparing polyvinyl butyral further include a plasticizer, which is selected from any one or a combination of at least two of triethylene glycol diisooctanoate (3GO), dioctyl adipate (DOA), dioctyl azelate (DINA), or dioctyl sebacate.

[0019] Preferably, the amount of plasticizer used is 3%-10% of the mass of PVA, for example 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, and most preferably 5%-8%.

[0020] Preferably, the raw materials for preparing polyvinyl butyral also include a catalyst.

[0021] Preferably, the catalyst is selected from at least one of p-toluenesulfonic acid (PTSA), phosphoric acid, or sulfuric acid, with p-toluenesulfonic acid being the most preferred.

[0022] Preferably, the amount of catalyst used is 0.5%-3% of the total mass of the reactants, for example 0.5%, 0.8%, 1%, 1.3%, 1.5%, 1.8%, 2%, 2.3%, 2.5%, 2.8% or 3%, preferably 1%-2%, and most preferably 1.5%.

[0023] Preferably, the raw materials for preparing polyvinyl butyral also include a reaction promoter.

[0024] Preferably, the reaction promoter is a Lewis acid or an organotin catalyst, preferably including any one or a combination of at least two of boron trifluoride diethyl ether complex (BF3·Et2O), boron trifluoride methanol solution, tin chloride, and dibutyltin dilaurate (DBTL), preferably dibutyltin dilaurate (DBTL) or diethyltin diisooctanoate, and most preferably dibutyltin dilaurate.

[0025] Preferably, the amount of the Lewis acid accelerator is 0.01%-0.2% of the total mass of the reactants, for example, 0.01%, 0.03%, 0.05%, 0.1%, 0.12%, 0.15%, 0.18% or 0.2%, and most preferably 0.05%-0.1%.

[0026] Preferably, the amount of the organotin accelerator is 0.01%-0.05% of the total mass of the reactants, for example, 0.01%, 0.02%, 0.03%, 0.04% or 0.05%.

[0027] On the other hand, a method for preparing polyvinyl butyral as described above is provided, the method comprising the following steps:

[0028] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 70%-85% is mixed with aldehyde compounds, catalysts, reaction promoters and plasticizers, and reacted to obtain polyvinyl butyral.

[0029] Preferably, the reaction temperature is 40-70°C, for example 40°C, 45°C, 50°C, 55°C, 60°C, 65°C or 70°C, most preferably 50-60°C.

[0030] Preferably, the reaction time is 2-8 hours, for example 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours or 8 hours, and most preferably 4-6 hours.

[0031] After the reaction of the present invention is completed, excess solvent is removed by vacuum evaporation, preferably at a temperature of 40-60°C.

[0032] On the other hand, the present invention provides a polyvinyl butyral membrane, wherein the polyvinyl butyral membrane is prepared from polyvinyl butyral as described above.

[0033] In this invention, the polyvinyl butyral film is obtained by extrusion molding.

[0034] Preferably, the thickness of the polyvinyl butyral film is 0.2-2 mm, and most preferably 0.3-1 mm.

[0035] In this invention, the damping performance of the PVB membrane is determined by dynamic mechanical analysis (DMA), and the measurement frequency is preferably from 1 Hz to 10 kHz, and most preferably from 1 kHz to 5 kHz.

[0036] The hydroxyl content of the PVB film was determined by Fourier transform infrared spectroscopy (FTIR).

[0037] The hydroxyl content of the polyvinyl butyral film of the present invention is preferably 4%-10%, and most preferably 5%-8%.

[0038] In this invention, the polyvinyl acetate (PVAC) content in the PVB film is tested by Fourier transform infrared spectroscopy (FTIR). The PVAC content in the PVB film of this invention is 15%-30%, most preferably 22%-25%. The acetal group content is preferably 60%-75%, most preferably 68%-70%.

[0039] In this invention, the ash content of the PVB film is preferably less than 0.5%, and most preferably less than 0.1%.

[0040] In this invention, the viscosity of the PVB film is measured using a rotational viscometer, preferably at a temperature of 20-30°C, and most preferably at 25°C. The viscosity of the PVB film of this invention is preferably 150-400 mPa·s, and most preferably 250-350 mPa·s.

[0041] Preferably, the surface roughness of the PVB film is 15-40 micrometers, and most preferably 25-35 micrometers.

[0042] In this invention, the polyvinyl butyral film has high light transmittance (up to 80%-95%, more preferably 90% or more), haze of less than 1% (most preferably less than 0.5%), tensile strength of 18-30 MPa (most preferably 22-28 MPa), elongation at break of 150%-250% (preferably 200% or more), damping coefficient of 0.3-0.7 (preferably 0.5 or more), and acoustic wave transmission loss of 30-40 dB (preferably 35 dB or more).

[0043] On the other hand, the present invention provides the application of the polyvinyl butyral film as described above in automotive laminated glass, architectural soundproof glass or photovoltaic glass.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The polyvinyl butyral film of this invention has high light transmittance (over 90%), low haze (<0.5%), high elasticity, and excellent sound insulation properties, making it suitable for applications such as automotive windshields and architectural soundproof glass. The entire process is simple and controllable, making it suitable for large-scale industrial production. Detailed Implementation

[0046] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0047] The sources of some of the raw materials used in the following examples are as follows:

[0048] Polyvinyl alcohol with a degree of hydrolysis of 80%: Chuanwei 080-44;

[0049] Polyvinyl alcohol with a degree of hydrolysis of 85%: Chuanwei 088-50;

[0050] Polyvinyl alcohol with a degree of hydrolysis of 70%: Chuanwei 098-35;

[0051] Polyvinyl alcohol with a degree of hydrolysis of 98%: Chuanwei 070-100.

[0052] Example 1

[0053] This embodiment provides a polyvinyl butyral membrane, which is prepared by the following method:

[0054] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 80% was mixed with heptaldehyde and nonanaldehyde (molar ratio of heptaldehyde and nonanaldehyde was 1:1), along with the catalyst p-toluenesulfonic acid (1% of the total mass of the reactants), the reaction promoter dibutyltin dilaurate (0.03% of the total mass of the reactants), and the plasticizer triethylene glycol diisooctanoate (3% of the total mass of the reactants). The mixture was reacted at 60°C for 4 hours to obtain polyvinyl butyral. The polyvinyl butyral was then extruded to prepare a polyvinyl butyral film with a thickness of 1 mm.

[0055] Example 2

[0056] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0057] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 85% was mixed with heptaldehyde and nonanaldehyde (molar ratio of heptaldehyde and nonanaldehyde was 1:1), along with the catalyst p-toluenesulfonic acid (1.5% of the total mass of reactants), the reaction promoter dibutyltin dilaurate (0.01% of the total mass of reactants), and the plasticizer triethylene glycol diisooctanoate (5% of the total mass of reactants). The mixture was reacted at 50°C for 6 hours to obtain polyvinyl butyral. The polyvinyl butyral was then extruded to prepare a polyvinyl butyral film with a thickness of 1.5 mm.

[0058] Example 3

[0059] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0060] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 80%, heptaldehyde and nonanaldehyde (molar ratio of heptaldehyde and nonanaldehyde is 1:1), p-toluenesulfonic acid catalyst (8% of the total mass of reactants), boron trifluoride diethyl ether complex reaction promoter (0.1% of the total mass of reactants), and dioctyl adipate plasticizer (3% of the total mass of reactants) were mixed and reacted at 50°C for 5 hours to obtain polyvinyl butyral. The polyvinyl butyral film with a thickness of 0.8 mm was then prepared by extrusion molding.

[0061] Example 4

[0062] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0063] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 70%, heptaldehyde and nonanaldehyde (molar ratio of heptaldehyde and nonanaldehyde is 1:1), p-toluenesulfonic acid catalyst (1% of the total mass of reactants), dibutyltin dilaurate reaction promoter (0.1% of the total mass of reactants), and triethylene glycol diisooctanoate plasticizer (1% of the total mass of reactants) were mixed and reacted at 40°C for 8 hours to obtain polyvinyl butyral. The polyvinyl butyral was then extruded to prepare a polyvinyl butyral film with a thickness of 1.8 mm.

[0064] Example 5

[0065] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0066] Polyvinyl alcohol (PVA) with a degree of alcoholysis of 80%, heptaldehyde and nonanaldehyde (molar ratio of heptaldehyde and nonanaldehyde is 1:1), phosphoric acid catalyst (0.5% of the total mass of reactants), boron trifluoride methanol solution reaction promoter (0.2% of the total mass of reactants), and dioctyl azelate plasticizer (5% of the total mass of reactants) were mixed and reacted at 70°C for 2 hours to obtain polyvinyl butyral. The polyvinyl butyral film with a thickness of 1 mm was then prepared by extrusion molding.

[0067] Example 6

[0068] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0069] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 80% and heptaldehyde, along with phosphoric acid catalyst (1% of the total mass of reactants), dibutyltin dilaurate reaction promoter (0.02% of the total mass of reactants), and dioctyl azelate plasticizer (5% of the total mass of reactants), were mixed and reacted at 65°C for 5 hours to obtain polyvinyl butyral. The polyvinyl butyral film with a thickness of 1 mm was then prepared by extrusion molding.

[0070] Example 7

[0071] This embodiment provides a polyvinyl butyral, which is prepared by the following method:

[0072] Polyvinyl alcohol (PVA) with a degree of hydrolysis of 80% and decanal, along with phosphoric acid catalyst (1.5% of the total mass of reactants), dibutyltin dilaurate reaction promoter (0.05% of the total mass of reactants), and dioctyl azelate plasticizer (3% of the total mass of reactants), were mixed and reacted at 50°C for 4 hours to obtain polyvinyl butyral. The polyvinyl butyral was then extruded to prepare a polyvinyl butyral film with a thickness of 0.9 mm.

[0073] Comparative Example 1

[0074] The only difference from Example 1 is that the polyvinyl alcohol with a degree of hydrolysis of 80% is replaced with an equal amount of polyvinyl alcohol with a degree of hydrolysis of 98%.

[0075] Comparative Example 2

[0076] The only difference from Example 1 is that the plasticizer triethylene glycol diisooctanoate is not added.

[0077] Comparative Example 3

[0078] The only difference from Example 1 is that the reaction promoter dibutyltin dilaurate is not added.

[0079] The polyvinyl butyral membranes prepared in the examples and comparative examples were subjected to performance testing. The testing items and methods are as follows:

[0080] 1. Light transmittance test

[0081] Test objective: To evaluate the transparency of the PVB film to ensure its suitability in terms of optical performance.

[0082] Test standard: in accordance with ASTM D1003 standard.

[0083] Test steps:

[0084] Sample preparation: Cut the PVB film sample to a thickness of 0.8 mm and a size of 10 cm x 10 cm.

[0085] Equipment calibration: Use an optical transmittance meter to ensure the equipment is calibrated before testing.

[0086] Measurement procedure: Place the sample in the instrument's test slot, ensuring the sample is perfectly aligned with the instrument's optical path. Record the transmittance at a specific wavelength, typically within the visible light range.

[0087] Data recording: Calculate the transmittance, requiring a transmittance higher than 10% to ensure good visibility, and record the test results for each sample.

[0088] 2. Haze Test

[0089] Test objective: To determine the haze of the membrane to reflect its transparency and visual clarity.

[0090] Test steps:

[0091] Sample preparation: Similar to the transmittance test, prepare samples of the same specifications.

[0092] Equipment calibration: Use a haze meter to calibrate the instrument to ensure the accuracy of the test.

[0093] Measurement procedure: Place the sample on the test platform of the haze meter. Start the device and record the haze value displayed by the instrument, usually expressed as a percentage.

[0094] Data analysis: The lower the haze value, the higher the transparency. The haze value should not exceed 3% to ensure good visual effect.

[0095] 3. Impact resistance test

[0096] Test objective: To evaluate the membrane's durability under external forces and ensure its safety performance.

[0097] Test standard: Based on ASTM D256 standard.

[0098] Test steps:

[0099] Sample preparation: Cut the sample to an appropriate size, usually 10cm x 10cm, with a thickness of 0.8mm.

[0100] Equipment setup: Use a pendulum impact tester to adjust the mass and height of the impact hammer.

[0101] Test Procedure: The sample is fixed on the test platform to ensure it will not move due to external forces. The pendulum is released and allowed to fall freely, and the destructive energy is recorded. Temperature Changes: Tests are conducted at room temperature, low temperature (-20℃), and high temperature (70℃), and the destructive energy at each temperature is recorded.

[0102] Data recording: Record the impact resistance of each sample under different conditions to ensure that the membrane maintains good impact resistance under various environmental conditions.

[0103] 4. Sound insulation performance test

[0104] Test objective: To evaluate the sound insulation effect of PVB film and ensure its comfort in automotive applications.

[0105] Testing standard: Based on ISO 140 standard.

[0106] Test steps:

[0107] Sample preparation: Prepare a sample with the same specifications as the example.

[0108] Equipment preparation: Use acoustic testing equipment and ensure that the equipment is calibrated before testing.

[0109] Test environment: Place the sample in an acoustic chamber to ensure good sound insulation and avoid external noise interference.

[0110] Sound source setup: Select a sound source of appropriate frequency (e.g., 500Hz) to generate sound waves inside the acoustic enclosure.

[0111] Measurement process:

[0112] Record the sound intensity before and after the sample is taken, and calculate the transmission loss (TL). Evaluate its sound insulation effect at different frequencies, ensuring that it has a significant sound insulation effect at frequencies of 500 Hz and above.

[0113] Data analysis: The higher the transmission loss value, the better the sound insulation effect. Generally, a transmission loss of 30dB or more is required.

[0114] 5. Thermal stability test

[0115] Test objective: To evaluate the performance of PVB film under high temperature conditions and ensure its safety and stability for long-term use.

[0116] Testing standard: Thermogravimetric analysis (TGA) is used for testing.

[0117] Test steps:

[0118] Sample preparation: Prepare a sample with a thickness of 0.8 mm.

[0119] Equipment setup: Place the sample into the sample chamber of the thermogravimetric analyzer.

[0120] Testing process:

[0121] Set a temperature range (e.g., from room temperature to 150°C) and heat the sample at a constant rate. Record the mass change of the sample during the heating process and observe whether there is significant degradation.

[0122] Data recording: Ensure that the sample quality remains above 98% within the range of 130-150℃.

[0123] 6. Ultraviolet Weathering Resistance Test

[0124] Test objective: To ensure that the membrane can maintain its performance even after long-term exposure to sunlight, and to avoid degradation caused by light exposure.

[0125] Test steps:

[0126] Sample preparation: Prepare a sample with the same specifications as the example.

[0127] Equipment preparation: Use a xenon arc lamp for accelerated aging testing.

[0128] Testing procedure: Place the sample under a xenon arc lamp and set the irradiation time (e.g., 200 hours). Observe the color change and transmittance change of the sample regularly.

[0129] Data recording: Record the changes in transmittance after irradiation to ensure that the transmittance remains above 90% after irradiation.

[0130] 7. Chemical stability test

[0131] Test objective: To evaluate the performance stability of PVB membranes under different acid and alkaline environments.

[0132] Test steps:

[0133] Sample preparation: Prepare a sample with the same specifications as the example.

[0134] Test environment preparation: Prepare acid and alkaline solutions with different pH values ​​(e.g., pH 4-10).

[0135] Testing procedure: Immerse the sample in solutions with different pH values ​​for a set time (e.g., 24 hours). After removing the sample, observe its transmittance, haze, and appearance.

[0136] Data recording: Record the performance changes of the sample under different pH conditions to ensure that there is no significant degradation and that the original performance is maintained.

[0137] The test data are shown in Table 1.

[0138] Table 1

[0139]

[0140] The applicant declares that this invention illustrates the method for synthesizing high-acetyl-content superelastic polyvinyl butyral through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials for the product of this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A polyvinyl butyral compound, characterized in that, The raw materials for preparing polyvinyl butyral include polyvinyl alcohol with a degree of alcoholysis of 70%-85% and aldehyde compounds, wherein the aldehyde compounds include any one or a combination of at least two of heptaldehyde, nonanaldehyde, and decanaldehyde.

2. The polyvinyl butyral according to claim 1, characterized in that, The degree of alcoholysis of the polyvinyl alcohol is 80%; Preferably, the aldehyde compound is a combination of heptanal and nonanal, and the molar ratio of heptanal to nonanal is preferably 1:1; Preferably, the mass ratio of polyvinyl alcohol to aldehyde compound is 1:1.2-1:1.

7.

3. The polyvinyl butyral according to claim 1 or 2, characterized in that, The raw materials for preparing polyvinyl butyral also include plasticizers, which are selected from any one or a combination of at least two of triethylene glycol diisooctyl ester, dioctyl adipate, dioctyl azelate, or dioctyl sebacate. Preferably, the amount of plasticizer used is 3%-10% of the mass of PVA, and most preferably 5%-8%.

4. The polyvinyl butyral according to any one of claims 1-3, characterized in that, The raw materials for preparing polyvinyl butyral also include a catalyst; Preferably, the catalyst is selected from at least one of p-toluenesulfonic acid, phosphoric acid, or sulfuric acid, with p-toluenesulfonic acid being the most preferred. Preferably, the amount of catalyst used is 0.5%-3% of the total mass of the reactants, more preferably 1%-2%, and most preferably 1.5%.

5. The polyvinyl butyral according to any one of claims 1-3, characterized in that, The raw materials for preparing polyvinyl butyral also include a reaction promoter; Preferably, the reaction promoter is a Lewis acid or an organotin catalyst, preferably including any one or a combination of at least two of boron trifluoride diethyl ether complex, boron trifluoride methanol solution, tin chloride or dibutyltin dilaurate, preferably dibutyltin dilaurate or diethyltin diisooctanoate, and most preferably dibutyltin dilaurate. Preferably, the amount of the Lewis acid accelerator is 0.01%-0.2% of the total mass of the reactants, and most preferably 0.05%-0.1%. Preferably, the amount of the organotin accelerator is 0.01%-0.05% of the total mass of the reactants.

6. A method for preparing polyvinyl butyral according to any one of claims 1-5, characterized in that, The preparation method includes the following steps: Polyvinyl alcohol with a degree of alcoholysis of 70%-85% and aldehyde compounds, along with a catalyst, reaction promoter and plasticizer, are mixed and reacted to obtain polyvinyl butyral.

7. The preparation method according to claim 6, characterized in that, The reaction temperature is 40-70℃, preferably 50-60℃; Preferably, the reaction time is 2-8 hours, and more preferably 4-6 hours.

8. A polyvinyl butyral film, characterized in that, The polyvinyl butyral film is prepared from polyvinyl butyral according to any one of claims 1-5.

9. The polyvinyl butyral film according to claim 8, characterized in that, The polyvinyl butyral film is obtained by extrusion molding.

10. The polyvinyl butyral film according to claim 8 or 9, characterized in that, The thickness of the polyvinyl butyral film is 0.2-2 mm, and most preferably 0.3-1 mm.

11. The application of polyvinyl butyral film according to any one of claims 8-10 in automotive laminated glass, architectural soundproof glass or photovoltaic glass.

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