Heat and sound insulation type PVB (polyvinyl butyral) film and preparation method thereof

Abstract

The invention discloses a heat and sound insulation type PVB (polyvinyl butyral) film and a preparation method thereof. The PVB film is formed by compounding and co-extruding A-layer PVB resin, B-layer damping and sound insulation PVB resin, C-layer heat insulation PVB resin, B-layer damping and sound insulation PVB resin and A-layer PVB resin, wherein the B-layer damping sound-insulation PVB resin comprises PVB resin and modified PVB resin accounting for 20%-30% of the mass of the PVB resin, and the modified PVB resin is prepared by introducing high-molecular organic matter and hollow silicon dioxide microspheres into an in-situ synthesis process of the PVB resin. On the basis that the PVB film has the heat insulation and sound insulation effects, the problem that the stability of the functional layer film is reduced or the interface bonding capacity of the functional layer film and an adjacent film layer material is reduced due to the addition of the functional filler is also effectively avoided, so that the stability of production line process preparation is improved.

Description

Technical Field

[0001] This invention belongs to the field of PVB film technology, and particularly relates to a heat-insulating and sound-insulating PVB film and its preparation method. Background Technology

[0002] PVB, chemically known as polyvinyl butyral, possesses high transparency, cold resistance, and impact resistance. It exhibits excellent adhesion to metals, glass, wood, ceramics, and fiber products. Interlayer films made from PVB resin powder are used as interlayer materials in safety glass, which boasts high transparency and impact strength, and is widely used in high-rise buildings, aerospace, and automotive fields. Currently, most PVB powder is prepared through emulsion polymerization of PVA and n-butyral in a reactor. This traditional method requires the addition of large amounts of emulsifiers and subsequent rinsing with large amounts of pure water, which is detrimental to environmental friendliness and sustainable development. PVB films prepared by extrusion casting of PVB powder possess excellent light transmittance and strong impact resistance, and have been widely used in high-rise building windows and doors and automotive glass in recent years.

[0003] Traditional PVB interlayers are typically made of a single material and lack sufficient acoustic damping, resulting in poor noise insulation. Furthermore, the increasing adoption of large sunroofs in cars, while providing natural light, also causes the interior temperature to rise rapidly under direct sunlight in summer, increasing the load on the air conditioning system and leading to higher fuel and electricity consumption.

[0004] Therefore, existing research on PVB films has evolved beyond traditional single-function applications to achieve dual-layer or multi-layer composite integration and synergistic effects, providing both thermal insulation and heat insulation. However, this pursuit of functional diversification has also increased the difficulty of PVB film fabrication processes. In particular, the addition of functional fillers significantly impacts the stability of multi-layer composite synergistic films, affecting their success in fabrication.

[0005] Based on this, a sound and heat insulation PVB film based on a multi-layer structure is provided. By optimizing the design of the film, the problem of decreased stability of functional layers or reduced interfacial bonding ability with other layers caused by the introduction of different functional fillers is solved, so as to realize large-scale industrial production and application and improve the preparation stability of the product. Summary of the Invention

[0006] Purpose of the invention: The technical problem to be solved by the present invention is to provide a sound and heat insulation PVB film based on a multi-layer structure, which can simultaneously provide heat insulation and sound insulation functions, while also effectively avoiding the problems of reduced stability of the functional layer film itself or reduced interfacial bonding ability between the functional layer film and adjacent film materials caused by the addition of functional fillers, thereby improving the stability of the production line process.

[0007] Technical solution: The present invention is a heat-insulating and sound-insulating PVB film, which is composed of a composite co-extruded layer of PVB resin (layer A), a layer of damping and sound-insulating PVB resin (layer B), a layer of heat-insulating PVB resin (layer C), a layer of damping and sound-insulating PVB resin (layer B), and a layer of PVB resin (layer A); wherein, the damping and sound-insulating PVB resin (layer B) includes PVB resin and modified PVB resin accounting for 20%-30% of the mass of the PVB resin.

[0008] The modified PVB resin is prepared by the following steps:

[0009] (1) Add water to the reactor, stir and add polyvinyl alcohol at 40℃-42℃, keep warm for 30min-35min, raise the temperature to 70℃-95℃, add antioxidant and keep warm for 1.5h-2h to form a polyvinyl alcohol solution with a concentration of 5wt%-10wt%.

[0010] (2) When the polyvinyl alcohol solution cools down to 50℃-80℃, add the high molecular weight organic matter, dispersant and 20nm-50nm hollow silica microspheres, and stir to mix evenly;

[0011] (3) Add an acid catalyst, cool down to 5℃-15℃, add n-butyraldehyde, and react with acetal at 30℃-50℃ for 4h-8h. After neutralization, washing with water, drying, crushing and sieving, the modified PVB resin is obtained.

[0012] Furthermore, in step (2) of preparing the modified PVB resin of the heat-insulating and sound-insulating PVB film, the high molecular organic material is selected from one or two of aromatic polyester polyurethane, terminal hydroxyl phenolic polyurethane, cashew phenolic resin or alicyclic hydroxyl epoxy resin, and its addition amount is 5%-15% of the mass of polyvinyl alcohol.

[0013] Furthermore, in step (2) of the preparation of the modified PVB resin of the heat-insulating and sound-insulating PVB film, the amount of hollow silica microspheres added is 3%-5% of the mass of polyvinyl alcohol.

[0014] Furthermore, in step (2) of the preparation of the modified PVB resin of the heat-insulating and sound-insulating PVB film, the dispersant is selected from one of sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, and polyvinylpyrrolidone, and its addition amount is 0.1%-0.8% of the mass of polyvinyl alcohol.

[0015] Furthermore, in step (1) of the preparation of the modified PVB resin of the heat-insulating and sound-insulating PVB film, the antioxidant is composed of a hindered phenolic main antioxidant and a phosphite auxiliary antioxidant in a mass ratio of (1-2):1, and the amount of antioxidant added is 0.15%-0.4% of the mass of polyvinyl alcohol.

[0016] Furthermore, the C-layer heat-insulating PVB resin of this heat-insulating and sound-insulating PVB film comprises PVB resin, 0.5%-1% by weight of nano-infrared blocking particles, and 0.1%-0.3% by weight of dispersant. Preferably, the nano-infrared blocking particles are selected from antimony tin oxide, indium tin oxide, or nano-tungsten oxide; the dispersant is selected from sodium carboxymethyl cellulose, hydroxypropyl methylcellulose, and polyvinylpyrrolidone.

[0017] Furthermore, the heat-insulating and sound-insulating PVB film contains 25%-30% plasticizer in its A layer PVB resin; 10%-15% plasticizer in its B layer damping and sound-insulating PVB resin; and 20%-25% plasticizer in its C layer heat-insulating PVB resin. The plasticizer is selected from one of triethylene glycol diisooctanoate, tetraethylene glycol diheptanoate, or dibutyl sebacate.

[0018] The method for preparing the above-mentioned heat-insulating and sound-insulating PVB film according to the present invention includes the following steps: five layers of PVB resin are co-extruded at extrusion speeds of 500 kg / h to 800 kg / h, respectively, according to the extrusion flow ratio of layer A PVB resin, layer B damping and sound-insulating PVB resin, and layer C heat-insulating PVB resin, at extrusion temperatures of 100℃-120℃ for layer A PVB resin, 110℃-130℃ for layer B damping and sound-insulating PVB resin, and 105℃-125℃ for layer C heat-insulating PVB resin. Preferably, the extrusion flow ratio of layer A PVB resin, layer B damping and sound-insulating PVB resin, and layer C heat-insulating PVB resin is 2:1:1.

[0019] Beneficial effects: Compared with the prior art, the significant advantages of this invention are that, based on the preparation of a five-layer PVB film, the heat-insulating and sound-insulating PVB film introduces high-molecular organic matter and nano-hollow silica microspheres into the damping and sound-insulating PVB resin in the second and fourth layers by using modified PVB resin. Relying on the internal friction between the grafted high-molecular organic molecular chains, sound energy can be effectively converted into phonon heat energy dissipation, and the addition of hollow silica microspheres significantly hinders sound wave propagation. Furthermore, through the design of varying the softness and hardness of PVB chain segments in each layer (variations in plasticizers and formulations), the sound propagation interface loss is increased, and the 2:1 thickness design increases the sound propagation resonance loss.

[0020] Furthermore, by incorporating polymeric organic matter and hollow silica microspheres into the B-layer damping and sound-insulating PVB resin using a modified PVB resin approach, the bonding capacity of the polymeric organic matter and hollow silica microspheres within this PVB resin layer is increased, improving stability and preventing precipitation. On the other hand, the modified PVB resin effectively enhances the interfacial similarity and compatibility between the B-layer damping and sound-insulating PVB resin and its adjacent PVB resin layers, improving the interfacial bonding between different layers and avoiding the drawbacks of reduced interfacial compatibility caused by the introduction of polymeric organic matter. This improves the overall stability of the PVB film preparation process and its structural stability, preventing delamination or segregation. Attached Figure Description

[0021] Figure 1 This is a product image of a glass clip formed from the PVB film prepared according to the present invention;

[0022] Figure 2 Product image of a glass clip formed from commercially available water-absorbing soundproofing film;

[0023] Figure 3 Impedance tube test diagrams of glass clips formed by the PVB film of the present invention and glass clips formed by commercially available water-absorbing sound insulation films.

[0024] Figure 4 The diagram shows the sound insulation test results of the glass clip formed by the PVB film of the present invention and the glass clip formed by the commercially available water-absorbing sound insulation film. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the polymeric organic compounds used in the following embodiments and comparative examples of the present invention are selected from aromatic polyester polyurethanes, such as poly(1115 succinate)-TDI-MOCA, etc. The aromatic polyester polyurethane used in the following embodiments is Huafeng HF-8020.

[0027] The modified PVB resin used in the following embodiments of the present invention is prepared by the following steps:

[0028] (1) Add water to the reactor, stir and add polyvinyl alcohol with a degree of alcoholysis of 98-100% at about 40°C, keep warm for about 30 minutes, raise the temperature to 80°C, add antioxidant of 0.2% of the mass of polyvinyl alcohol and keep warm for about 2 hours to form a polyvinyl alcohol solution with a concentration of 8wt%; the antioxidant is composed of hindered phenolic main antioxidant 1010 and phosphite auxiliary antioxidant 168 in a mass ratio of 1:1.

[0029] (2) When the polyvinyl alcohol solution cools down to about 60°C, add the aromatic polyester polyurethane, the dispersant polyvinylpyrrolidone, and the 20nm-50nm hollow silica microspheres, and stir to mix evenly; the amount of aromatic polyester polyurethane added is about 10% of the mass of polyvinyl alcohol; the amount of dispersant polyvinylpyrrolidone added is about 0.5% of the mass of polyvinyl alcohol; and the amount of hollow silica microspheres added is about 4% of the mass of polyvinyl alcohol.

[0030] (3) Add 30% hydrochloric acid (the amount added is sufficient for catalysis), cool down to about 10°C, add n-butyraldehyde, and react with acetal at 40°C for 6 hours. After neutralization, washing with water, drying, crushing, and sieving to 80 mesh or higher, the modified PVB resin is obtained.

[0031] Furthermore, the PVB resin used in the A layer, B layer, damping and sound-insulating PVB resin, and C layer, heat-insulating PVB resin of this invention are all of the same grade.

[0032] Example 1

[0033] The PVB film in Example 1 is co-extruded from a composite of layer A PVB resin, layer B damping and sound-insulating PVB resin, layer C heat-insulating PVB resin, layer B damping and sound-insulating PVB resin, and layer A PVB resin. Wherein:

[0034] Layer A PVB resin comprises PVB resin particles and 28% by weight of the plasticizer triethylene glycol diisooctanoate.

[0035] Layer B damping and sound-insulating PVB resin includes PVB resin particles, 25% modified PVB resin by mass of the PVB resin, and 12% plasticizer triethylene glycol diisooctanoate by mass of the PVB resin.

[0036] The C-layer insulation PVB resin includes PVB resin particles, 0.8% antimony tin oxide by mass of the PVB resin particles, 0.2% polyvinylpyrrolidone dispersant by mass of the PVB resin particles, and 22% triethylene glycol diisooctanoate plasticizer by mass of the PVB resin particles.

[0037] The method for preparing the heat-insulating and sound-insulating PVB film in Example 1 includes the following steps: The five layers of PVB resin (layer A, layer B, layer B, layer C, and layer C) are co-extruded at an extrusion rate of 600 kg / h, with an extrusion flow ratio of 2:1:1. The extrusion temperatures are approximately 100°C for layer A, 120°C for layer B, and 115°C for layer C. This results in heat-insulating and sound-insulating PVB films with layer thicknesses of 0.1 mm, 0.20 mm, 0.16 mm, 0.20 mm, and 0.1 mm, respectively.

[0038] Comparative Example 1

[0039] Comparative Example 1 is basically the same as Example 1, except that the aromatic polyester polyurethane and hollow silica microspheres are directly physically blended with PVB resin. Specifically:

[0040] The PVB film in Comparative Example 1 is co-extruded from a composite of layer A PVB resin, layer B damping and sound-insulating PVB resin, layer C heat-insulating PVB resin, layer B damping and sound-insulating PVB resin, and layer A PVB resin. Wherein:

[0041] Layer A PVB resin comprises PVB resin particles and 28% by weight of the plasticizer triethylene glycol diisooctanoate.

[0042] Layer B damping and sound-insulating PVB resin includes PVB resin, approximately 10% of the high-molecular-weight organic aromatic polyester polyurethane, 4% of the hollow silica microspheres, and 12% of the plasticizer triethylene glycol diisooctanoate in the PVB resin particles.

[0043] The C-layer insulation PVB resin includes PVB resin particles, 0.8% antimony tin oxide by mass of the PVB resin particles, 0.2% polyvinylpyrrolidone dispersant by mass of the PVB resin particles, and 22% triethylene glycol diisooctanoate plasticizer by mass of the PVB resin particles.

[0044] The method for preparing the heat-insulating and sound-insulating PVB film in Comparative Example 1 includes the following steps: The five layers of PVB resin (layer A, layer B, layer B, layer C, and layer C) are co-extruded at an extrusion rate of 600 kg / h, with an extrusion flow ratio of 2:1:1. The extrusion temperatures are approximately 100°C for layer A, 120°C for layer B, and 115°C for layer C. This results in heat-insulating and sound-insulating PVB films with layer thicknesses of 0.1 mm, 0.20 mm, 0.16 mm, 0.20 mm, and 0.1 mm, respectively.

[0045] Example 2

[0046] The PVB film in Example 2 is co-extruded from a composite of layer A PVB resin, layer B damping and sound-insulating PVB resin, layer C heat-insulating PVB resin, layer B damping and sound-insulating PVB resin, and layer A PVB resin. Wherein:

[0047] Layer A PVB resin comprises PVB resin particles and 25% by weight of the plasticizer triethylene glycol diisooctanoate.

[0048] Layer B damping and sound-insulating PVB resin includes PVB resin particles, 20% modified PVB resin by mass of the PVB resin, and 10% plasticizer triethylene glycol diisooctanoate by mass of the PVB resin.

[0049] The C-layer insulation PVB resin includes PVB resin particles, 0.5% antimony tin oxide by mass of the PVB resin particles, 0.1% polyvinylpyrrolidone dispersant by mass of the PVB resin particles, and 20% triethylene glycol diisooctanoate plasticizer by mass of the PVB resin particles.

[0050] The method for preparing the heat-insulating and sound-insulating PVB film in Example 2 includes the following steps: The five layers of PVB resin (layer A, layer B, layer B, layer C, and layer C) are co-extruded at an extrusion rate of 600 kg / h, with an extrusion flow ratio of 2:1:1. The extrusion temperatures are approximately 100°C for layer A, 110°C for layer B, and 105°C for layer C. This results in heat-insulating and sound-insulating PVB films with layer thicknesses of 0.1 mm, 0.20 mm, 0.16 mm, 0.20 mm, and 0.1 mm, respectively.

[0051] Comparative Example 2

[0052] Comparative Example 2 is basically the same as Example 2, except that the aromatic polyester polyurethane and hollow silica microspheres are directly physically blended with PVB resin. Specifically:

[0053] The PVB membrane in Comparative Example 2 is co-extruded from a composite of layer A PVB resin, layer B damping and sound-insulating PVB resin, layer C heat-insulating PVB resin, layer B damping and sound-insulating PVB resin, and layer A PVB resin. Wherein:

[0054] Layer A PVB resin comprises PVB resin particles and 25% by weight of the plasticizer triethylene glycol diisooctanoate.

[0055] Layer B damping and sound-insulating PVB resin includes PVB resin, 10% by weight of the high-molecular-weight organic aromatic polyester polyurethane, 4% by weight of the PVB resin hollow silica microspheres, and 10% by weight of the PVB resin in the PVB resin particles plasticizer triethylene glycol diisooctanoate.

[0056] The C-layer insulation PVB resin includes PVB resin particles, 0.5% antimony tin oxide by mass of the PVB resin particles, 0.1% polyvinylpyrrolidone dispersant by mass of the PVB resin particles, and 20% triethylene glycol diisooctanoate plasticizer by mass of the PVB resin particles.

[0057] The method for preparing the heat-insulating and sound-insulating PVB film in Comparative Example 2 includes the following steps: The five layers of PVB resin (layer A, layer B, layer B, layer C, and layer C) are co-extruded at an extrusion rate of 600 kg / h, with an extrusion flow ratio of 2:1:1. The extrusion temperatures are approximately 100°C for layer A, 110°C for layer B, and 105°C for layer C, respectively. This results in heat-insulating and sound-insulating PVB films with layer thicknesses of 0.1 mm, 0.20 mm, 0.16 mm, 0.20 mm, and 0.1 mm.

[0058] Example 3

[0059] The PVB film in Example 3 is co-extruded from a composite of layer A PVB resin, layer B damping and sound-insulating PVB resin, layer C heat-insulating PVB resin, layer B damping and sound-insulating PVB resin, and layer A PVB resin. Wherein:

[0060] Layer A PVB resin comprises PVB resin particles and 30% by weight of the plasticizer triethylene glycol diisooctanoate.

[0061] Layer B damping and sound-insulating PVB resin includes PVB resin particles, 30% modified PVB resin by mass of the PVB resin, and 15% plasticizer triethylene glycol diisooctanoate by mass of the PVB resin.

[0062] The C-layer insulation PVB resin includes PVB resin particles, 1% antimony tin oxide by mass of the PVB resin particles, 0.3% polyvinylpyrrolidone dispersant by mass of the PVB resin particles, and 25% triethylene glycol diisooctanoate plasticizer by mass of the PVB resin particles.

[0063] The method for preparing the heat-insulating and sound-insulating PVB film in Example 2 includes the following steps: The five layers of PVB resin (layer A, layer B, layer B, layer C, and layer C) are co-extruded at an extrusion rate of 600 kg / h, with an extrusion flow ratio of 2:1:1. The extrusion temperatures are approximately 120°C for layer A, 130°C for layer B, and 125°C for layer C. This results in heat-insulating and sound-insulating PVB films with layer thicknesses of 0.1 mm, 0.20 mm, 0.16 mm, 0.20 mm, and 0.1 mm, respectively.

[0064] Product Characterization 1 - Product Image

[0065] The glass clip product formed by the PVB film prepared in Example 1 above is shown in the figure. Figure 1 As shown, the glass clips formed by commercially available water-absorbing soundproofing films, such as Figure 2 It looks identical.

[0066] Performance Test 1 - Sound Insulation Performance

[0067] The sound insulation performance of the glass clip products prepared in Examples 1 to 3, Comparative Examples 1 and 2 was tested, and the results are shown in Table 1 below. Meanwhile, the sound insulation performance of the glass clip prepared according to this invention was compared with that of a commercially available glass clip formed from a water-absorbing soundproofing film, and the results are shown below. Figure 3 and Figure 4 As shown.

[0068] Table 1. Sound insulation performance data of the glass clip products in the examples and comparative examples.

[0069]

[0070] pass Figure 3 and Figure 4 It can be seen that the PVB film produced by this invention has a superior sound insulation effect compared to commercially available mature Sekisui sound insulation film. Furthermore, as shown in Table 1, the sound insulation effect is more significant when high-molecular organic matter and hollow silica microspheres are introduced by in-situ synthesis and modification of PVB resin compared to physical blending.

[0071] Performance Test 2 - Thermal Insulation Performance

[0072] The glass clip was placed inside the chamber and irradiated with a 250W infrared lamp. Temperature sensors were also placed inside the chamber to detect the temperature above and below the glass clip. The results obtained after 2 hours are shown in Table 2 below.

[0073] Table 2 Thermal insulation performance of PVB film

[0074]

[0075] As shown in Table 2, both the present invention and the comparative example can effectively achieve heat insulation by introducing heat-insulating particles. The difference between the two is not significant, achieving a combination of sound insulation and heat insulation effects.

[0076] Performance Testing 2 - Optical Performance

[0077] The optical properties of the glass clips prepared using this PVB film before and after aging were evaluated, and the results are shown in Table 3 below. The aging process involved treating the glass clips at 85℃ and 85%RH for 1000 hours.

[0078] Table 3 Optical performance of the examples and comparative examples before and after aging

[0079]

[0080] As shown in Table 3, the PVB film prepared in this invention not only exhibits excellent optical properties, but also, based on data before and after aging, demonstrates that the in-situ generation of modified PVB resin, which introduces polymeric organic matter and hollow silica microspheres, not only ensures the stability of the functional resin layer containing these materials without precipitation, but also maintains superior optical properties even after aging. This further confirms the strong fusion and high interfacial bonding between this layer and adjacent layers. In contrast, the physical blending method results in a significant decrease in optical properties after chemical blending. This is due to the reduced stability of the functional layer or the decreased interfacial bonding between different functional fillers introduced, leading to decreased product stability and consequently, a decline in optical performance.

[0081] It should be noted that the structural layer PVB film and its preparation process of the present invention can achieve the technical effects claimed above, and therefore no further individual experiments are needed to verify them.

Claims

1. A heat-insulating and sound-insulating PVB film, characterized in that, The PVB membrane is co-extruded from a layer of PVB resin (A layer), a layer of damping and sound-insulating PVB resin (B layer), a layer of heat-insulating PVB resin (C layer), a layer of damping and sound-insulating PVB resin (B layer), and a layer of PVB resin (A layer); wherein, the layer of damping and sound-insulating PVB resin (B layer) includes PVB resin and modified PVB resin accounting for 20%-30% of the mass of the PVB resin. The modified PVB resin is prepared by the following steps: (1) Add water to the reactor, stir and add polyvinyl alcohol at 40℃-42℃, keep warm for 30min-35min, raise the temperature to 70℃-95℃, add antioxidant and keep warm for 1.5h-2h to form a polyvinyl alcohol solution with a concentration of 5wt%-10wt%. (2) When the polyvinyl alcohol solution cools down to 50℃-80℃, add the high molecular weight organic matter, dispersant and 20nm-50nm hollow silica microspheres, and stir to mix evenly; (3) Add an acid catalyst, cool down to 5℃-15℃, add n-butyraldehyde, and react with acetal at 30℃-50℃ for 4h-8h. After neutralization, washing with water, drying, crushing and sieving, the modified PVB resin is obtained.

2. The heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, In step (2), the high molecular organic compound is selected from one or two of aromatic polyester polyurethane, terminal hydroxyl phenolic polyurethane, cashew phenolic resin or alicyclic hydroxyl epoxy resin, and its addition amount is 5%-15% of the mass of polyvinyl alcohol.

3. The heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, In step (2), the amount of hollow silica microspheres added is 3%-5% of the mass of polyvinyl alcohol.

4. The heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, In step (2), the dispersant is selected from sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, and polyvinylpyrrolidone, and its addition amount is 0.1%-0.8% of the mass of polyvinyl alcohol.

5. The heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, In step (1), the antioxidant is a compound of hindered phenolic primary antioxidant and phosphite secondary antioxidant in a mass ratio of (1-2):1, and the amount of antioxidant added is 0.15%-0.4% of the mass of polyvinyl alcohol.

6. The heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, The C-layer heat-insulating PVB resin includes PVB resin, nano-infrared blocking particles accounting for 0.5%-1% of the mass of PVB resin, and dispersant accounting for 0.1%-0.3% of the mass of PVB resin.

7. The heat-insulating and sound-insulating PVB film according to claim 6, characterized in that, The nano-infrared blocking particles are selected from antimony tin oxide, indium tin oxide, or nano-tungsten oxide; the dispersant is selected from sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, or polyvinylpyrrolidone.

8. The heat-insulating and sound-insulating PVB film according to claim 6, characterized in that, The A-layer PVB resin also includes 25%-30% plasticizer by weight; the B-layer damping and sound-insulating PVB resin also includes 10%-15% plasticizer by weight; the C-layer heat-insulating PVB resin also includes 20%-25% plasticizer by weight; the plasticizer is selected from one of triethylene glycol diisooctanoate, tetraethylene glycol diheptanoate, or dibutyl sebacate.

9. A method for preparing the heat-insulating and sound-insulating PVB film according to claim 1, characterized in that, The process includes the following steps: Based on the extrusion flow ratio of layer A PVB resin, layer B damping and sound-insulating PVB resin, and layer C heat-insulating PVB resin, five layers are co-extruded at extrusion speeds of 500 kg / h to 800 kg / h at extrusion temperatures of 100℃-120℃ for layer A PVB resin, 110℃-130℃ for layer B damping and sound-insulating PVB resin, and 105℃-125℃ for layer C heat-insulating PVB resin.

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