PVB film with sound insulation function and preparation method thereof

Abstract

The invention discloses a PVB film with a sound insulation function and a preparation method thereof, and belongs to the technical field of PVB films. Comprising a first PVB film layer, a second PVB film layer and a sound insulation layer arranged between the first PVB film layer and the second PVB film layer. The sound insulation layer comprises TPU and TPEE; pVB resin hydroxyl values in the first PVB film layer and the second PVB film layer are different. The PVB resin hydroxyl values in the two film layers are different, so that the adhesive property can be enhanced, and meanwhile, the film has better flowability and is easier to form a film. The sound insulation layer is prepared by mixing TPU and TPEE, so that the weather resistance and the impact resistance can be improved; the PVB film layer and the sound insulation layer enhance the sound insulation performance through a complementary effect, the PVB film layer mainly absorbs sound wave energy and provides a damping effect to insulate sound, the sound insulation layer mainly absorbs the sound wave energy through the characteristics of the material, and the combination of the PVB film layer and the sound insulation layer can enhance the damping effect on sound waves and reduce the resonance phenomenon; the sound insulation performance is further enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of PVB films, and in particular to a PVB film with sound insulation function and a preparation method thereof. Background Art

[0002] PVB is a product of the condensation of polyvinyl alcohol and butyraldehyde under acid catalysis. Since PVB molecules contain relatively long side chains, they have good flexibility, low glass transition temperature, high tensile strength and impact resistance. Films made from PVB have excellent light transmittance and impact resistance, and are widely used in automotive windshields, window glass, architectural glass and other fields. They can also play a role in sound insulation and heat insulation.

[0003] The continuous progress and innovation of technology will push the performance of sound insulation PVB film to a new level, and the emergence of new materials, advanced processes and new technologies will provide more help for the development of sound insulation PVB film. With the acceleration of urbanization and the improvement of people's quality of life, the demand for sound insulation materials is growing steadily. As one of the high-quality sound insulation materials, it has broad market prospects and great development potential.

[0004] Generally, soundproof PVB film has excellent soundproofing performance, but its soundproofing effect is not very ideal under certain noise frequencies. For example, the soundproof PVB film prepared by compounding three layers of PVB films with different thicknesses and different melt indices in application number CN201610975475.1 can effectively block noise with a frequency of 1000 to 4000 Hz, but the weather resistance of the obtained PVB film may decrease, which will reduce the mechanical properties of the soundproof film in low or high temperature environments, thereby reducing the soundproofing performance. For example, in a low temperature environment, the PVB film will harden, resulting in a decrease in its soundproofing performance. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a PVB film with sound insulation function and a preparation method thereof, so as to at least achieve the purpose of improving the mechanical properties and sound insulation performance in high and low temperature environments.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A PVB film with sound insulation function, comprising a first PVB film layer, a second PVB film layer, and a sound insulation layer arranged between the first PVB film layer and the second PVB film layer;

[0008] The sound insulation layer includes TPU resin and TPEE resin;

[0009] The hydroxyl values ​​of the PVB resins in the first PVB film layer and the second PVB film layer are different.

[0010] In the present invention, the PVB film with sound insulation function is compounded in sequence by three layers of film, namely, a first PVB film layer, a second PVB film layer and a sound insulation layer. The hydroxyl values ​​of the PVB resins in the first PVB film layer and the second PVB film layer are different to enhance the bonding performance, and have good bonding ability to the sound insulation layer and the glass, and have better fluidity and are easier to form a film. The sound insulation layer is made by mixing TPU resin and TPEE resin, which plays a role in sound insulation and improves weather resistance and impact resistance. The PVB film layer and the sound insulation layer enhance the sound insulation performance through complementary effects. The PVB film layer mainly insulates by absorbing sound wave energy and providing damping. The sound insulation layer mainly absorbs sound wave energy through the characteristics of its material itself. The combination of the two can not only enhance the damping effect on sound waves, but also reduce resonance, thereby further enhancing the sound insulation performance.

[0011] In addition, the reason why the sound insulation layer in the present invention uses a mixed resin of TPU resin and TPEE resin is as follows:

[0012] As an intermediate layer material, TPU is difficult to form and prone to bubbles. At the same time, its performance may be affected in a high temperature environment, such as causing problems of thermal aging and heat diffusion. TPEE has excellent processing performance and excellent high temperature resistance. Mixing the two can enhance the overall processing performance and high temperature resistance.

[0013] When TPEE is used alone as the intermediate layer material, higher processing temperature and pressure are required, the process parameters are more complicated, and the UV resistance of TPEE is not as good as TPU. Long-term exposure to ultraviolet rays may cause aging, discoloration and other problems.

[0014] Mixing TPEE with TPU can enhance the UV resistance of the overall film, while also reducing the processing temperature and pressure. Using TPU and TPEE to blend the film can produce a synergistic effect, while maintaining high elasticity, enhancing mechanical properties, improving processing fluidity, and adapting to use in extreme environments.

[0015] Preferably, the first PVB film layer and the second PVB film layer both comprise the following components in parts by weight:

[0016] 70-80 parts of PVB resin, 24-30 parts of plasticizer, 0.15-3.5 parts of antioxidant, 0.1-0.2 parts of ultraviolet absorber;

[0017] Wherein, the hydroxyl value of the PVB resin is 17-20%.

[0018] Preferably, the difference in hydroxyl value of the PVB resin in the first PVB film layer and the second PVB film layer is 0.5%.

[0019] Preferably, the sound insulation layer B comprises the following components in parts by weight:

[0020] 10 to 20 parts of TPU resin, 10 to 20 parts of TPEE resin, 1 to 5 parts of the plasticizer, 0.05 to 0.15 parts of the antioxidant, 0.035 to 0.07 parts of the ultraviolet absorber, and 0.0175 to 0.035 parts of the surfactant.

[0021] In this solution, weather resistance is further enhanced by adding antioxidants and UV absorbers. Since TPU and TPEE have different molecular structures and chemical properties, their compatibility may not achieve ideal results when they are mixed. Therefore, a modifier needs to be added to solve the problem of uneven dispersion.

[0022] Preferably, the antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol (BHT), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), tris(2,4-di-tert-butylphenyl) phosphite, and dilauryl thiodipropionate.

[0023] Preferably, the ultraviolet absorber is one or more of UV-P, UVP-327, UV-5411, YASORBUV-2908, and UV-571.

[0024] Preferably, the surfactant is one or more of methacrylate, acrylic acid, and silane coupling agent.

[0025] Preferably, the thickness of the first PVB film layer and the second PVB film layer are both 0.33 mm, and the thickness of the sound insulation layer is 0.1 mm.

[0026] In addition, to achieve the above object, the present invention also provides a method for preparing a PVB film with sound insulation function, comprising the following steps:

[0027] S1, dissolving an antioxidant and an ultraviolet absorber in a plasticizer, mixing them evenly, and then extruding them with two PVB resin powders with different hydroxyl values ​​through a twin-screw extruder to obtain two layers of PVB film, i.e., a first PVB film layer and a second PVB film layer; dissolving an antioxidant, an ultraviolet absorber, and a surface modifier in a plasticizer, mixing them evenly, and then mixing them evenly with TPU resin and TPEE resin, and then extruding them through a twin-screw extruder to obtain a TPU / TPEE blended film, i.e., a sound insulation layer;

[0028] S2. The three-layer film in step S1 is laminated by hot pressing using a hot press to obtain a PVB film with sound insulation function.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. In the present invention, the PVB film with sound insulation function is compounded in sequence by three layers of film, namely, a first PVB film layer, a second PVB film layer and a sound insulation layer. The hydroxyl values ​​of the PVB resins in the first PVB film layer and the second PVB film layer are different to enhance the bonding performance, and have good bonding ability to the sound insulation layer and the glass, and have better fluidity and are easier to form a film. The sound insulation layer is made by mixing TPU resin and TPEE resin, which plays a role in sound insulation, while improving weather resistance and impact resistance, and reducing processing difficulty. The PVB film layer and the sound insulation layer enhance the sound insulation performance through complementary effects. The PVB film layer mainly insulates by absorbing sound wave energy and providing damping. The sound insulation layer mainly absorbs sound wave energy through the characteristics of its own material. The combination of the two can not only enhance the damping effect on sound waves, but also reduce resonance, thereby further enhancing the sound insulation performance.

[0031] 2. The PVB film prepared by the present invention has good mechanical properties, a haze lower than 0.11%, a transmittance higher than 88.1%, and an appearance with almost no color change and no bubbles after irradiation in the UVA band for 100 hours. Its appearance has almost no color change and no bubbles at 140°C for 2 hours. The sound insulation is 35-37dB, with significant sound insulation effect, excellent resistance to cold and heat shock, and minimal impact on the sound insulation effect under high and low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structure of the PVB film with sound insulation function.

[0033] Among them, 1-first PVB film layer, 2-PVB film layer, 3-sound insulation layer. DETAILED DESCRIPTION

[0034] Example 1

[0035] like Figure 1 As shown, the PVB film with sound insulation function includes a first PVB film layer 1, a second PVB film layer 2, and a sound insulation layer 3 arranged between the first PVB film layer 1 and the second PVB film layer 2;

[0036] The thickness of the first PVB film layer 1 and the second PVB film layer 2 are both 0.33 mm, and the thickness of the sound insulation layer 3 is 0.1 mm.

[0037] The specific preparation method is as follows:

[0038] S1. Preparation of the first PVB film layer 1 and the second PVB film layer 2:

[0039] 0.5 parts by weight of antioxidant BHT and 0.15 parts by weight of ultraviolet absorber UV-P were dissolved in 25 parts by weight of 3G8 plasticizer and mixed evenly to prepare a 3G8 mixed solution. The 3G8 mixed solution and 60 parts by weight of PVB resin powder with a hydroxyl value of 17.5% and 20 parts by weight of PVB resin powder with a hydroxyl value of 17% were extruded through a twin-screw extruder at 160° C. to obtain two layers of PVB film, namely, a first PVB film layer 1 and a second PVB film layer 2.

[0040] Preparation of sound insulation layer 3:

[0041] 0.1 parts by weight of antioxidant BHT, 0.05 parts by weight of ultraviolet absorber UV-P, and 0.02 parts by weight of surface modifier methacrylate were dissolved in 3 parts by weight of 3G8 plasticizer and mixed evenly to prepare a 3G8 mixed solution. The 3G8 mixed solution was mixed evenly with 20 parts by weight of TPU resin and 10 parts by weight of TPEE resin, and extruded by a twin-screw extruder at 190° C. and a screw speed of 80 r / min to obtain a TPU / TPEE blended film, i.e., the sound insulation layer 3.

[0042] S2. Preheat the three-layer film A, B, and C to 120°C, set the lamination temperature of the first stage to 130°C, the pressure of the first stage to -0.1MPa, the lamination temperature of the second stage to 140°C, the pressure of the second stage to -0.2KPa, the lamination temperature of the third stage to 170°C, the pressure of the third stage to 97KPa, and perform hot pressing and compounding by a hot press to obtain a PVB film with sound insulation function.

[0043] Example 2

[0044] Compared with Example 1, the PVB resin powder is adjusted to 60 parts by weight of PVB resin powder with a hydroxyl value of 18% and 20 parts by weight of PVB resin powder with a hydroxyl value of 17.5%. The remaining parameters and steps are the same as in Example 1.

[0045] Example 3

[0046] Compared with Example 1, the PVB resin powder is adjusted to 60 parts by weight of PVB resin powder with a hydroxyl value of 18.5% and 20 parts by weight of PVB resin powder with a hydroxyl value of 18%. The remaining parameters and steps are the same as Example 1.

[0047] Example 4

[0048] Compared with Example 1, the PVB resin powder is adjusted to 60 parts by weight of PVB resin powder with a hydroxyl value of 19% and 20 parts by weight of PVB resin powder with a hydroxyl value of 18.5%. The remaining parameters and steps are the same as in Example 1.

[0049] Example 5

[0050] Compared with Example 1, the PVB resin powder is adjusted to 60 parts by weight of PVB resin powder with a hydroxyl value of 19.5% and 20 parts by weight of PVB resin powder with a hydroxyl value of 19%. The remaining parameters and steps are the same as Example 1.

[0051] Example 6

[0052] Compared with Example 1, the PVB resin powder is adjusted to 60 parts by weight of PVB resin powder with a hydroxyl value of 20% and 20 parts by weight of PVB resin powder with a hydroxyl value of 19.5%. The remaining parameters and steps are the same as Example 1.

[0053] Example 7

[0054] Compared with Example 1, the weight parts of TPU and TPEE are adjusted, and the adjusted weight parts are as follows:

[0055] The weight parts of TPU are 15 parts, and the weight parts of TPEE are 15 parts.

[0056] The remaining parameters and steps are the same as in Example 1.

[0057] Example 8

[0058] Compared with Example 1, the weight parts of TPU and TPEE are adjusted, and the adjusted weight parts are as follows:

[0059] The weight parts of TPU are 10 parts, and the weight parts of TPEE are 20 parts.

[0060] The remaining parameters and steps are the same as in Example 1.

[0061] Comparative Example 1

[0062] Compared with Example 1, no modifier methacrylate is added.

[0063] The remaining parameters and steps are the same as in Example 1.

[0064] Comparative Example 2

[0065] Compared with Example 1, the PVB resin is changed to 60 parts by weight of PVB resin powder having a hydroxyl value of 17.5% and 20 parts by weight of PVB resin powder having a hydroxyl value of 16.5%.

[0066] The remaining parameters and steps are the same as in Example 1.

[0067] Comparative Example 3

[0068] Compared with Example 1, the PVB resin is changed to 60 parts by weight of PVB resin powder having a hydroxyl value of 18% and 20 parts by weight of PVB resin powder having a hydroxyl value of 16%.

[0069] The remaining parameters and steps are the same as in Example 1.

[0070] Performance testing.

[0071] The PVB films prepared in Examples 1-8 and Comparative Examples 1-3 were subjected to relevant performance tests, and the test results are shown in Table 1.

[0072] In Table 1, the impact resistance test method is as follows:

[0073] The laminated glass prepared by the PVB films and glass prepared in Examples 1-8 and Comparative Examples 1-3 according to the standard was placed in a freezer at -20±1°C for 4 hours and then taken out. The laminated glass was fixed at the center of the sample frame of the drop ball impact tester, and a quenched steel ball was placed 8500mm above the center of the glass and released. The test was carried out. If the quenched steel ball did not penetrate the glass, it was qualified.

[0074] The PVB films and glasses prepared in Examples 1-8 and Comparative Examples 1-3 were respectively placed in a refrigerator at 40±1°C for 4 hours to prepare laminated glass according to the standard. The laminated glass was then taken out and fixed at the center of the sample frame of a falling ball impact tester. A quenched steel ball was placed 9000 mm above the center of the glass and released. The test was carried out. If the quenched steel ball did not penetrate the glass, the glass was qualified.

[0075] The test quantity is 6 pieces.

[0076] Table 1:

[0077]

[0078]

[0079]

[0080] It can be seen from Table 1 that the PVB films prepared in Examples 1-8 have good mechanical properties, with a haze lower than 0.11%, a transmittance higher than 88.1%, and almost no discoloration and bubbles in appearance after 100h of UVA band irradiation. At 140℃ for 2h, almost no discoloration and bubbles in appearance, and a sound insulation of 35-37dB, with significant sound insulation effect, excellent resistance to cold and hot shocks, and little effect on sound insulation under high and low temperatures. The reason why Comparative Example 1 showed slight yellowing and bubbles after UVA band irradiation and 140℃ heat resistance test was that no modifier was added, resulting in uneven mixing of TPU and TPEE, unstable performance of the material, and local performance differences. Comparative Examples 2-3 had the problem of reduced performance because PVB resins with large differences in hydroxyl values ​​required higher temperatures and pressures in processing. At the existing processing temperature and pressure, the miscibility of PVB resins was poor, resulting in uneven processing and affecting the overall performance.

Claims

1. A PVB film with sound insulation function, characterized in that: It comprises a first PVB film layer (1), a second PVB film layer (2), and a sound insulation layer (3) arranged between the first PVB film layer (1) and the second PVB film layer (2); The sound insulation layer (3) comprises TPU resin and TPEE resin; The hydroxyl values ​​of the PVB resins in the first PVB film layer (1) and the second PVB film layer (2) are different.

2. The PVB film with sound insulation function according to claim 1, characterized in that: The first PVB film layer (1) and the second PVB film layer (2) both comprise the following components in parts by weight: 70-80 parts of PVB resin, 24-30 parts of plasticizer, 0.15-3.5 parts of antioxidant, 0.1-0.2 parts of ultraviolet absorber; Wherein, the hydroxyl value of the PVB resin is 17-20%.

3. The PVB film with sound insulation function according to claim 2, characterized in that: The difference in hydroxyl value between the PVB resin in the first PVB film layer (1) and the second PVB film layer (2) is 0.5%.

4. The PVB film with sound insulation function according to claim 3, characterized in that: The sound insulation layer (3) B comprises the following components in parts by weight: 10 to 20 parts of TPU resin, 10 to 20 parts of TPEE resin, 1 to 5 parts of the plasticizer, 0.05 to 0.15 parts of the antioxidant, 0.035 to 0.07 parts of the ultraviolet absorber, and 0.0175 to 0.035 parts of the surfactant.

5. The PVB film with sound insulation function according to claim 4, characterized in that: The antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, tris(2,4-di-tert-butylphenyl) phosphite, and dilauryl thiodipropionate.

6. The PVB film with sound insulation function according to claim 4, characterized in that: The ultraviolet absorber is one or more of UV-P, UVP-327, UV-5411, YASORBUV-2908, and UV-571.

7. The PVB film with sound insulation function according to claim 4, characterized in that: The surfactant is one or more of methacrylate, acrylic acid, and silane coupling agent.

8. The PVB film with sound insulation function according to claim 1, characterized in that: The thickness of the first PVB film layer (1) and the second PVB film layer (2) are both 0.33 mm, and the thickness of the sound insulation layer (3) is 0.1 mm.

9. The method for preparing a PVB film with sound insulation function according to any one of claims 1 to 8, characterized in that: The steps include: S1, dissolving an antioxidant and an ultraviolet absorber in a plasticizer, mixing them evenly, and then extruding them with two PVB resin powders with different hydroxyl values ​​through a twin-screw extruder to obtain two layers of PVB film, namely, a first PVB film layer (1) and a second PVB film layer (2); dissolving an antioxidant, an ultraviolet absorber, and a surface modifier in a plasticizer, mixing them evenly, and then mixing them evenly with TPU resin and TPEE resin, and then extruding them through a twin-screw extruder to obtain a TPU / TPEE blended film, namely, a sound insulation layer (3); S2. The three-layer film in step S1 is laminated by hot pressing using a hot press to obtain a PVB film with sound insulation function.

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