Wide-temperature-range sound insulation intermediate film and preparation method thereof

Abstract

The invention relates to the technical field of functional polymer materials, in particular to a wide-temperature-range sound insulation intermediate film and a preparation method thereof. The middle film comprises at least one functional layer A and at least one functional layer B which are stacked; the tan delta peak temperature Ta of the functional layer A satisfies 30 DEG C < = Ta < = 50 DEG C, and the Mw / Mn of the resin constituting the functional layer A is 1.8-2.5; the content of the plasticizer in the functional layer A is 35-45 phr; the tan delta peak temperature Tb of the functional layer B is greater than or equal to-10 DEG C and less than or equal to 10 DEG C, and the Mw / Mn of the resin forming the functional layer B is 4.5-6.5; and the content of the plasticizer in the functional layer B is 55-65 phr. Through core differential molecular design, the functional layer A and the functional layer B respectively have specific dynamic viscoelastic characteristics, molecular weight distribution and plasticizer content. After the two components are compounded, the damping peak is between-10 DEG C and 50 DEG C, so that continuous and effective coverage and synergy are realized.

Description

Technical Field

[0001] This invention relates to the field of functional polymer materials technology, and in particular to a wide-temperature-range sound-insulating interlayer membrane and its preparation method. Background Technology

[0002] With increasing societal demands for noise control, the application of sound-insulating interlayer membranes in construction, transportation, and other fields is expanding. To maintain effective sound insulation performance over a wide temperature range, two strategies are commonly employed: one is to directly increase the thickness of a single-layer interlayer membrane; the other is to use a multi-layer structure with a larger total thickness. While these methods can extend the effective damping temperature range to some extent, they inevitably lead to increased material weight and cost, making it difficult to meet the demands of modern products for lightweight and thin designs.

[0003] Currently, some thin sound-insulating interlayer membranes have appeared on the market, but their sound insulation performance under extreme temperature environments still has significant limitations. Specifically, sound insulation performance often decreases significantly at low temperatures (such as -10℃) and high temperatures (such as 50℃), resulting in a narrow effective damping temperature range and an inability to achieve stable sound insulation across the entire temperature range. In addition, thinner designs often come at the cost of sacrificing the mechanical properties of the material, such as insufficient rigidity, further limiting their application in high-end or load-bearing structures. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a wide-temperature-range sound-insulating interlayer membrane and its preparation method. Through core differentiated molecular design, functional layers A and B are endowed with specific dynamic viscoelastic properties, molecular weight distributions, and plasticizer contents, respectively. When the two are combined, their damping peaks achieve continuous and effective coverage and synergy within a temperature range of -10℃ to 50℃.

[0005] To achieve the above objectives, the present invention provides a wide temperature range sound insulation interlayer membrane, comprising at least one functional layer A and at least one functional layer B stacked together; The peak temperature Ta of the dynamic mechanical loss factor tanδ of functional layer A satisfies: 30℃≤Ta≤50℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer A is 1.8-2.5; the content of plasticizer in functional layer A is 35-45 phr. The peak temperature Tb of the dynamic mechanical loss factor tanδ of functional layer B satisfies: -10℃≤Tb≤10℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer B is 4.5-6.5; the content of plasticizer in functional layer B is 55-65 phr.

[0006] Preferably, the intermediate membrane has a three-layer symmetrical structure of B / A / B.

[0007] Preferably, the thickness of a single functional layer A is 0.2-0.3 mm, and the thickness of a single functional layer B is 0.1-0.2 mm; and the ratio of the thickness of functional layer A to the total thickness of the wide temperature range sound insulation interlayer is 40-50:100.

[0008] Preferably, the resin material for both functional layer A and functional layer B is polyvinyl butyral resin.

[0009] The present invention also provides a method for preparing the wide-temperature-range sound-insulating interlayer membrane, comprising the following steps: S1. Prepare a first resin composition for forming functional layer A and a second resin composition for forming functional layer B, respectively; S2. The first resin composition is molded into a functional layer A film, and the second resin composition is molded into a functional layer B film; S3. At least one A functional layer membrane and at least one B functional layer membrane are stacked in a preset order to form a laminate; S4. The laminated body is hot-pressed to obtain a wide-temperature-range sound-insulating intermediate film.

[0010] Preferably, in S3, two B functional layer films and one A functional layer film are stacked in the order of B / A / B.

[0011] Preferably, in S4, the temperature of hot pressing is 125-135℃, the pressure is 0.5-0.7MPa, and the time is 25-35min.

[0012] The beneficial effects of this invention are as follows: 1. This invention provides a wide-temperature-range sound-insulating interlayer membrane, comprising at least one A functional layer and at least one B functional layer stacked together; the peak temperature Ta of the dynamic mechanical loss factor tanδ of the A functional layer satisfies: 30℃≤Ta≤50℃, and the weight-average molecular weight to number-average molecular weight ratio of the resin constituting the A functional layer is 1.8-2.5; the plasticizer content in the A functional layer is 35-45 phr; the peak temperature Tb of the dynamic mechanical loss factor tanδ of the B functional layer satisfies: -10℃≤Tb≤10℃, and the weight-average molecular weight to number-average molecular weight ratio of the resin constituting the B functional layer is 4.5-6.5; the plasticizer content in the B functional layer is 55-65 phr. This invention, through core differentiated molecular design, enables the A functional layer (high-temperature damping layer) and the B functional layer (low-temperature damping layer) to possess specific dynamic viscoelastic properties (tanδ peak temperature), molecular weight distribution (Mw / Mn), and plasticizer content, respectively. Layer A provides effective damping and sound insulation in the high-temperature range of 30℃ to 50℃, while layer B focuses on the low-temperature range of -10℃ to 10℃. When combined, the damping peak achieves continuous and effective coverage and synergy across a wide temperature range of 60℃ (-10℃ to 50℃). This provides stable and reliable sound insulation for thin sound insulation materials in complex and variable climatic environments or operating conditions.

[0013] 2. This invention creatively uses a high-rigidity resin with a narrow molecular weight distribution (Mw / Mn of 1.8-2.5) as a "skeleton" in the A functional layer, which improves the overall energy storage modulus of the intermediate membrane, endows the material with excellent mechanical properties, and achieves the unity of "lightweight" and "high rigidity".

[0014] 3. Through precise functional allocation and synergy between layers A and B, this invention achieves high performance over a wide temperature range with a relatively thin single-layer thickness. This significantly reduces the material's unit area weight and production cost, improves its portability and processing applicability, and responds to the demand for lightweight and thin materials.

[0015] 4. Under the premise of ensuring ultra-wide temperature range sound insulation and high rigidity, this invention, through reasonable formulation system design (differential control of plasticizer content), enables the resulting intermediate film to simultaneously possess strong adhesion to the glass substrate, high visible light transmittance, and good weather resistance. Detailed Implementation

[0016] This invention provides a wide temperature range sound insulation interlayer membrane, comprising at least one functional layer A and at least one functional layer B stacked together; The peak temperature Ta of the dynamic mechanical loss factor tanδ of functional layer A satisfies: 30℃≤Ta≤50℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer A is 1.8-2.5; the content of plasticizer in functional layer A is 35-45 phr. The peak temperature Tb of the dynamic mechanical loss factor tanδ of functional layer B satisfies: -10℃≤Tb≤10℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer B is 4.5-6.5; the content of plasticizer in functional layer B is 55-65 phr.

[0017] The ratio of weight-average molecular weight to number-average molecular weight is denoted as Mw / Mn.

[0018] In this invention, the intermediate membrane has a three-layer symmetrical structure of B / A / B.

[0019] In this invention, the thickness of a single functional layer A is 0.2-0.3 mm, and the thickness of a single functional layer B is 0.1-0.2 mm; and the ratio of the thickness of functional layer A to the total thickness of the wide temperature range sound insulation interlayer is 40-50:100.

[0020] In this invention, the resin material for both functional layer A and functional layer B is polyvinyl butyral resin (PVB resin).

[0021] The present invention also provides a method for preparing the wide-temperature-range sound-insulating interlayer membrane, comprising the following steps: S1. Prepare a first resin composition for forming functional layer A and a second resin composition for forming functional layer B, respectively; S2. The first resin composition is molded into a functional layer A film, and the second resin composition is molded into a functional layer B film; S3. At least one A functional layer membrane and at least one B functional layer membrane are stacked in a preset order to form a laminate; S4. The laminated body is hot-pressed to obtain a wide-temperature-range sound-insulating intermediate film.

[0022] In this invention, in S3, two B functional layer films and one A functional layer film are stacked in the order of B / A / B.

[0023] In this invention, in step S4, the temperature of hot pressing is 125-135℃, the pressure is 0.5-0.7MPa, and the time is 25-35min.

[0024] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0025] Where specific experimental steps or conditions are not specified in the examples, they can be performed according to the conventional experimental steps or conditions described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0026] Example 1 This embodiment provides a method for preparing a wide-temperature-range sound-insulating interlayer membrane, comprising the following steps: First resin composition: PVB resin (Mw / Mn=2.2), with 40 phr of plasticizer added (40 parts by weight of plasticizer added per 100 parts by weight of resin), the plasticizer being triethylene glycol diisooctanoate (3GO).

[0027] Second resin composition: PVB resin (Mw / Mn=5.5), with 58 phr of plasticizer 3GO added.

[0028] The first resin composition and the second resin composition are melt-plasticized by a twin-screw extruder and extruded through a T-die, then cast and cooled to form films with thicknesses of 0.2 mm (layer A) and 0.15 mm (layer B).

[0029] Align and stack the three membrane layers in the order of B / A / B (0.15 / 0.2mm / 0.15mm) to form a composite.

[0030] The composite was placed in a hot press and kept at a temperature of 130℃ and a pressure of 0.6MPa for 30 minutes to obtain a wide-temperature-range sound-insulating interlayer with a total thickness of 0.48mm.

[0031] Example 2 This embodiment provides a method for preparing a wide-temperature-range sound-insulating interlayer membrane, which differs from Embodiment 1 in that the following modifications are made: First resin composition: PVB resin (Mw / Mn=2.0), with 38 phr of plasticizer added (38 parts by weight of plasticizer added per 100 parts by weight of resin), the plasticizer being triethylene glycol diisooctanoate (3GO).

[0032] Second resin composition: PVB resin (Mw / Mn=5.0), with 55 phr of plasticizer 3GO added.

[0033] The remaining preparation process is the same as in Example 1.

[0034] Comparative Example 1 This comparative example provides a method for preparing an intermediate membrane, which differs from Example 1 in that the following modifications are made: First resin composition: PVB resin (Mw / Mn=3.8), with 40 phr of plasticizer added (40 parts by weight of plasticizer added per 100 parts by weight of resin), the plasticizer being triethylene glycol diisooctanoate (3GO).

[0035] Second resin composition: PVB resin (Mw / Mn=5.5), with 58 phr of plasticizer 3GO added.

[0036] The remaining preparation process is the same as in Example 1.

[0037] Comparative Example 2 This comparative example provides a method for preparing an intermediate membrane, which differs from Example 1 in that the following modifications are made: First resin composition: PVB resin (Mw / Mn=2.2), with 40 phr of plasticizer added (40 parts by weight of plasticizer added per 100 parts by weight of resin), the plasticizer being triethylene glycol diisooctanoate (3GO).

[0038] Second resin composition: PVB resin (Mw / Mn=5.5), with 45 phr of plasticizer 3GO added.

[0039] The remaining preparation process is the same as in Example 1.

[0040] Experimental Example 1 The A-layer membranes and B-layer membranes in Examples 1-2 and Comparative Example 1 were tested according to ASTM D4065. The peak temperature Ta of the dynamic mechanical loss factor tanδ of the A-layer membrane in Example 1 was 40℃, and the peak temperature Tb of the dynamic mechanical loss factor tanδ of the B-layer membrane was 0℃. In Example 2, Ta was 45℃ and Tb was 5℃. In Comparative Example 1, Ta was 40℃ and Tb was 0℃.

[0041] Experiment Example 2 Seven temperature points (-10℃, 0℃, 10℃, 20℃, 30℃, 40℃, 50℃) were selected within the range of -10℃ to 50℃. The sound insulation performance (TL value) of the interlayer products (Examples 1-2 and Comparative Examples 1-2) was tested according to ASTM E90. At the same time, the energy storage modulus of each interlayer was tested according to ASTM D4065 at 30℃. The test results are recorded in Table 1.

[0042] Table 1 Test Results

[0043] In Table 1, " / " indicates that it was not tested.

[0044] As shown in Table 1, this invention achieves improved sound insulation stability of the thin sound-insulating interlayer membrane over a wide temperature range (TL value change of 3dB within the range of -10℃ to 50℃) by using a differentiated design and composite of a narrow-distribution (Mw / Mn: 1.8-2.5) resin in layer A and a wide-distribution (Mw / Mn: 4.5-6.5) resin in layer B. Simultaneously, the interlayer membrane exhibits excellent rigidity (storage modulus as high as 50-52MPa). In contrast, Comparative Example 1 uses a wide-distribution resin in layer A, and Comparative Example 2 adds 45 phr of plasticizer to layer B. Even maintaining the same three-layer structure and total thickness, this results in a significant deterioration in sound insulation stability and material rigidity.

[0045] Therefore, this invention adopts the above-mentioned wide-temperature-range sound insulation interlayer membrane and its preparation method, and through an innovative material system and structural design, provides a new type of sound insulation material with excellent comprehensive performance, taking into account the "wide-temperature-range sound insulation stability", "high structural rigidity" and "lightweight" of the sound insulation interlayer membrane.

[0046] Finally, it should be noted that the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A wide-temperature-range sound-insulating interlayer membrane, characterized in that, It includes at least one A functional layer and at least one B functional layer that are stacked together; The peak temperature Ta of the dynamic mechanical loss factor tanδ of functional layer A satisfies: 30℃≤Ta≤50℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer A is 1.8-2.5; the content of plasticizer in functional layer A is 35-45 phr. The peak temperature Tb of the dynamic mechanical loss factor tanδ of functional layer B satisfies: -10℃≤Tb≤10℃, and the ratio of the weight-average molecular weight to the number-average molecular weight of the resin constituting functional layer B is 4.5-6.5; the content of plasticizer in functional layer B is 55-65 phr.

2. The wide-temperature-range sound-insulating interlayer membrane according to claim 1, characterized in that, The intermediate membrane has a three-layer symmetrical structure of B / A / B.

3. The wide-temperature-range sound-insulating interlayer membrane according to claim 1 or 2, characterized in that, The thickness of a single functional layer A is 0.2-0.3 mm, and the thickness of a single functional layer B is 0.1-0.2 mm; and the ratio of the thickness of functional layer A to the total thickness of the wide temperature range sound insulation interlayer is 40-50:

100.

4. The wide-temperature-range sound-insulating interlayer membrane according to claim 1, characterized in that, The resin material for both functional layer A and functional layer B is polyvinyl butyral resin.

5. The method for preparing the wide-temperature-range sound-insulating interlayer membrane according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Prepare a first resin composition for forming functional layer A and a second resin composition for forming functional layer B, respectively; S2. The first resin composition is molded into a functional layer A film, and the second resin composition is molded into a functional layer B film; S3. At least one A functional layer membrane and at least one B functional layer membrane are stacked in a preset order to form a laminate; S4. The laminated body is hot-pressed to obtain a wide-temperature-range sound-insulating intermediate film.

6. The preparation method according to claim 5, characterized in that, In S3, two B-functional layer membranes and one A-functional layer membrane are stacked in the order of B / A / B.

7. The preparation method according to claim 5, characterized in that, In S4, the hot-pressing composite temperature is 125-135℃, the pressure is 0.5-0.7MPa, and the time is 25-35min.

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