Soundproofing and noise reduction modified plastic and preparation method thereof

Abstract

The application relates to the technical field of plastic processing, and particularly discloses sound insulation and noise reduction modified plastic and a preparation method thereof. The sound insulation and noise reduction modified plastic comprises, in terms of weight parts, 45-65 parts of ABS resin, 15-25 parts of butadiene styrene rubber, 8-16 parts of noise reduction master batch, 6-12 parts of a toughening agent, 2-5 parts of a compatilizer, 0.2-0.5 parts of an antioxidant and 0.15-0.25 parts of a lubricant; the noise reduction master batch is a three-layer structure noise reduction master batch, and the three-layer structure noise reduction master batch comprises, from inside to outside, a sound insulation inner core, a porous absorption transition layer and a compatibilized shell. The sound insulation and noise reduction modified plastic has a high sound insulation capacity and a damping temperature range in a wider frequency range, the noise reduction frequency band of a plastic product is wider, the effect is better, and the sound insulation and noise reduction modified plastic has excellent mechanical properties.

Description

Technical Field

[0001] This application relates to the field of plastic processing technology, and more specifically, to a sound-insulating and noise-reducing modified plastic and its preparation method. Background Technology

[0002] ABS resin (acrylonitrile-butadiene-styrene copolymer) is widely used in automotive interior parts, home appliance housings, consumer electronics, and office equipment due to its excellent mechanical strength, good impact resistance, surface gloss, and processing fluidity. However, as users' demands for quiet operation and comfort continue to increase, the inherent sound insulation and noise reduction properties of ABS material are becoming increasingly apparent. The density of ABS is generally between 1.04 and 1.07 g / cm³. 3 It is a lightweight plastic with low molecular chain friction and a small damping factor. Its ability to block and absorb airborne and structural sound transmission is limited, making it difficult to meet the requirements of high-end automobiles, precision electronics and other industries for low-noise environments.

[0003] To improve the sound insulation and noise reduction capabilities of ABS, existing technologies mainly employ two strategies: filler modification and structural composites. Filler modification involves adding high-density inorganic fillers (such as barium sulfate, calcium carbonate, and mica powder) or elastomer particles (such as EPDM rubber and nitrile rubber) to the ABS matrix. This increases the material's surface density or introduces a damping phase to dissipate sound energy. However, adding large amounts of inorganic fillers severely degrades the impact toughness and tensile strength of ABS, leading to brittleness, reduced processing fluidity, and uneven filler dispersion, which can easily cause surface defects. While adding elastomers can improve damping, it usually comes at the cost of sacrificing the rigidity and heat resistance of ABS, and its effective noise reduction bandwidth is relatively narrow. Structural composites combine ABS with porous sound-absorbing layers or dense sound-insulating layers to form a multi-layered structure. While this method can improve sound insulation, it is complex, costly, and prone to delamination at the interlayer interfaces over long-term use. It also increases product thickness and weight, contradicting the trend towards thinner, more integrated designs and hindering material recycling.

[0004] Therefore, for ABS matrix, how to significantly broaden the noise reduction frequency band and improve the overall sound insulation effect while maintaining its good mechanical and processing properties, and taking into account the simplicity, economy and environmental friendliness of the manufacturing process, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To improve the sound insulation and noise reduction effect of ABS plastic, this application provides a sound insulation and noise reduction modified plastic and its preparation method.

[0006] In a first aspect, this application provides a sound-insulating and noise-reducing modified plastic, which adopts the following technical solution:

[0007] A sound-insulating and noise-reducing modified plastic, by weight, comprises 45-65 parts ABS resin, 15-25 parts styrene-butadiene rubber, 8-16 parts noise-reducing masterbatch, 6-12 parts toughening agent, 2-5 parts compatibilizer, 0.2-0.5 parts antioxidant and 0.15-0.25 parts lubricant;

[0008] The noise reduction masterbatch is a three-layer structure, consisting of a sound-insulating core, a porous absorption transition layer, and a compatible outer shell, arranged sequentially from the inside out.

[0009] By adopting the above technical solution, damping elastomer styrene-butadiene rubber and three-layer noise-reducing masterbatch are introduced into the ABS matrix at the same time. The outer shell of the noise-reducing masterbatch contains ABS-g-MAH, which can be compatible with the ABS matrix and tightly bonded to the inner structure. This improves the problems of agglomeration and interface weakening caused by the direct addition of traditional fillers, thereby maintaining the excellent impact strength of plastic products.

[0010] The three-layer noise-reducing masterbatch uses a high-density core to block mid-to-high frequency sound waves, a porous transition layer to block mid-to-low frequency sound waves, and an outer shell as a gradient layer to reduce sound wave reflection loss at the interface between the masterbatch and the matrix. In synergy with styrene-butadiene rubber, it achieves a combined effect of sound insulation based on the law of appropriate modulus, sound absorption through porous structure, and viscoelastic damping, significantly broadening the noise reduction frequency band of plastic products. Furthermore, the core-shell structure of the three-layer masterbatch, with its high-modulus core and porous low-modulus soft layer, achieves a gradient modulus transition. External loads are buffered and attenuated by the soft layer, effectively preventing stress concentration on the hard core, thus effectively suppressing brittle fracture and ensuring the mechanical properties of plastic products.

[0011] Optionally, by weight, the raw materials of the noise reduction masterbatch sound insulation core include 60-75 parts barium sulfate, 15-25 parts EVA resin and 5-10 parts polyethylene wax.

[0012] Optionally, by weight, the raw materials of the porous sound-absorbing transition layer of the noise-reducing masterbatch include 40-55 parts diatomaceous earth, 25-35 parts EVA resin and 10-20 parts polyethylene wax.

[0013] Optionally, by weight, the raw materials of the noise reduction masterbatch compatible shell include 70-85 parts ABS-g-MAH, 10-20 parts ABS resin and 3-8 parts calcium stearate.

[0014] By adopting the above technical solution, the noise reduction masterbatch core of this application uses high-density barium sulfate. The acoustic impedance of barium sulfate is significantly different from that of air, which can effectively block the most penetrating high-frequency sound waves. The lubrication and dispersion of polyethylene wax reduces the melt viscosity, effectively promoting the uniform dispersion of barium sulfate in the EVA matrix, avoiding pores inside the core, and ensuring the consistency of sound insulation effect. The transition layer adopts a diatomaceous earth natural three-dimensional silica porous framework. Through the viscous friction of air molecules in the pores and the vibration of the pore walls, the sound energy is irreversibly converted into heat energy, which efficiently absorbs mid- and low-frequency noise and forms a continuous acoustic impedance gradient design. This effectively eliminates the strong reflection of the interface of the traditional inorganic filler single structure, and significantly improves the utilization rate of sound wave energy.

[0015] Furthermore, the pre-dispersion of masterbatch prevents filler agglomeration at the source. The ABS-g-MAH with a compatible shell forms covalent bonds through esterification with the hydroxyl groups on the filler surface via maleic anhydride active groups. At the same time, the styrene-acrylonitrile segments become molecularly entangled with the ABS matrix, achieving a dual effect of similar compatibility and chemical bonding. The interfacial bonding force is significantly enhanced, ensuring the mechanical strength of the plastic products.

[0016] Optionally, the method for preparing the noise reduction masterbatch includes the following steps:

[0017] S1: The barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 60-70°C. After discharge, the mixture is added to a twin-screw extruder and obtained as a sound insulation core after melt extrusion and granulation.

[0018] S2: The sound insulation core is added to a high-speed mixer along with diatomaceous earth, EVA resin and polyethylene wax. The mixture is stirred at 50-60°C. After discharge, it is added to a twin-screw extruder. After melt extrusion and granulation, a porous sound-absorbing transition layer coated masterbatch is obtained.

[0019] S3: Add the porous sound-absorbing transition layer coating masterbatch, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 40-50℃, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation, the product is obtained.

[0020] By adopting the above technical solution and precisely controlling the processing temperature at each step, it is ensured that the inner layer remains solid and does not melt when coating the outer layer, thereby maintaining the complete core-shell structure. The core is prepared first, and then the transition layer and outer shell are coated in sequence, ensuring that each layer can be uniformly and completely coated on the inner surface, avoiding local exposure. If a one-step extrusion method is used, all raw materials will melt and mix at the same time, making it impossible to form a layered structure and losing the advantages of the three-layer design.

[0021] Optionally, the toughening agent is selected from at least one of methyl methacrylate / butadiene / styrene copolymer, methyl methacrylate / acrylic polymer, acrylic-silicone rubber toughening agent, ethylene-methyl acrylate, ethylene-butyl acrylate, ethylene-acrylate-glycidyl methacrylate terpolymer, and ethylene-vinyl acetate copolymer-functionalized maleic anhydride.

[0022] Optionally, the lubricant is selected from at least one of silicone powder, pentaerythritol ester, and ethylene bis-stearamide.

[0023] Optionally, the antioxidant is at least one of phenolic antioxidants and amine antioxidants.

[0024] Optionally, the compatibilizer is any one of AS-g-MAH, AS-g-GMA, and PMMA-g-MAH.

[0025] Secondly, this application provides a method for preparing sound-insulating and noise-reducing modified plastics, using the following technical solution:

[0026] A method for preparing a sound-insulating and noise-reducing modified plastic includes the following steps:

[0027] Prepare the raw materials according to the proportions, mix ABS resin, styrene-butadiene rubber, noise reduction masterbatch, toughening agent, compatibilizer, antioxidant and lubricant evenly, and then feed them into a twin-screw extruder. After melt extrusion and granulation, the product is obtained. The extrusion temperature is 220-260℃ and the screw speed is 500-600r / min.

[0028] By adopting the above technical solution, this application has high production efficiency, uniform and stable product performance, and is suitable for large-scale industrial production.

[0029] In summary, this application has the following beneficial effects:

[0030] 1. Because this application uses a three-layer structure noise reduction masterbatch, with high-density barium sulfate as the core to block low and high frequency sound waves, and porous diatomaceous earth transition layer to block low and medium frequency sound waves, it forms a damping network with butyl rubber to work synergistically, effectively achieving high sound insulation and damping temperature range over a wider frequency range, and significantly broadening the noise reduction frequency band of plastic products.

[0031] 2. The three-layer noise reduction masterbatch of this application forms a core-shell structure with a high-modulus core and a porous low-modulus soft layer, realizing the transition of gradient modulus. External loads are buffered and attenuated by the soft layer, effectively preventing stress concentration on the hard core, thereby effectively suppressing brittle fracture and ensuring the mechanical properties of plastic products.

[0032] 3. The method of this application allows the noise reduction masterbatch to be directly blended with the matrix for injection molding through layer-by-layer low-temperature coating and melt extrusion in one step. This eliminates the need for complex multi-layer composite products, avoids the risk of interlayer delamination, simplifies the process, and ensures that all components have good compatibility with the ABS matrix, meet green and environmental protection requirements, and have a wide processing window and are easy to operate, making them suitable for large-scale continuous production. Detailed Implementation

[0033] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0034] raw material

[0035] Unless otherwise specified, all raw materials used in the embodiments and comparative examples in this application are commercially available products, specifically:

[0036] ABS resin, sourced from LG Korea, TR558A;

[0037] Styrene-butadiene rubber, selected from Fujian Fuxiang Chemical Co., Ltd., SBR-1502;

[0038] Ethylene-methyl acrylate, selected from Shanghai Jinghong Chemical Technology Co., Ltd., AC1125;

[0039] AS-g-MAH, selected from Shanghai Jiadeer Chemical Technology Co., Ltd., is a maleic anhydride grafted AS-g-MAH compatibilizer.

[0040] ABS-g-MAH, selected from Shanghai Jiadeer Chemical Technology Co., Ltd., is a maleic anhydride-grafted ABS-g-MAH compatibilizer.

[0041] Silicone powder, sourced from Dongguan Xingyuan Chemical Co., Ltd., CAS: 67763-03-5;

[0042] EVA resin, selected from Lotte Chemicals, VA600;

[0043] Polyethylene wax, selected from Dongguan Sanwen Chemical Raw Material Trading Co., Ltd., 105B.

[0044] Example of noise reduction masterbatch preparation

[0045] Preparation Example 1

[0046] The noise reduction masterbatch is a three-layer structure, consisting of a sound-insulating core, a porous absorption transition layer, and a compatible outer shell, arranged sequentially from the inside out. By weight, the sound-insulating core contains 68.5 parts barium sulfate, 21.5 parts EVA resin, and 7.5 parts polyethylene wax; the porous sound-absorbing transition layer contains 48.5 parts diatomaceous earth, 30 parts EVA resin, and 15 parts polyethylene wax; and the compatible outer shell contains 78.5 parts ABS-g-MAH, 15 parts ABS resin, and 5 parts calcium stearate.

[0047] The preparation method of the above-mentioned noise reduction masterbatch includes the following steps:

[0048] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution, add barium sulfate to a high-speed mixer, heat to 85℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions, wherein the amount of silane coupling agent KH-550 is 2.1% of the mass of barium sulfate, keep warm and stir for 18 min, and dry to obtain pretreated barium sulfate;

[0049] Pretreated barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 65°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the sound insulation core.

[0050] S2: Place diatomaceous earth in a muffle furnace, heat it to 450℃ at 8℃ / min, calcine for 2.5h, turn off the power and let it cool naturally to below 100℃ in the furnace, take it out and immediately transfer it to a high-speed mixer, dilute the titanate coupling agent NDZ-101 with anhydrous isopropanol at a mass ratio of 1:1.5, stir evenly to obtain a pretreatment solution, turn on the high-speed mixer, heat it to 75℃, and spray it evenly in the form of a mist, wherein the amount of titanate coupling agent NDZ-101 is 1.5% of the mass of diatomaceous earth, after spraying, continue to stir at high speed for 12min, discharge, dry, remove the solvent, and obtain pretreated diatomaceous earth;

[0051] The sound insulation core is added to a high-speed mixer along with pretreated diatomaceous earth, EVA resin and polyethylene wax. The mixture is stirred at 55°C and then fed into a twin-screw extruder. After melt extrusion and granulation at 110-130°C, a porous sound-absorbing transition layer coated masterbatch is obtained.

[0052] S3: Add the porous sound-absorbing transition layer coating masterbatch, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 40°C, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation at 160-180°C, the product is obtained.

[0053] Preparation Example 2

[0054] The noise reduction masterbatch is a three-layer structure, consisting of a sound-insulating core, a porous absorption transition layer, and a compatible shell, arranged from the inside out. By weight, the sound-insulating core contains 60 parts barium sulfate, 15 parts EVA resin, and 5 parts polyethylene wax; the porous sound-absorbing transition layer contains 40 parts diatomaceous earth, 25 parts EVA resin, and 10 parts polyethylene wax; and the compatible shell contains 70 parts ABS-g-MAH, 10 parts ABS resin, and 3 parts calcium stearate.

[0055] The preparation method of the above-mentioned noise reduction masterbatch includes the following steps:

[0056] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution. Add barium sulfate to a high-speed mixer, heat to 80℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions. The amount of silane coupling agent KH-550 is 1.5% of the mass of barium sulfate. Keep warm and stir for 15 min, and dry to obtain pretreated barium sulfate.

[0057] Pretreated barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 70°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the sound insulation core.

[0058] S2: Place diatomaceous earth in a muffle furnace, heat it to 500℃ at 10℃ / min, calcine for 2 hours, turn off the power and let it cool naturally to below 100℃ in the furnace, take it out and immediately transfer it to a high-speed mixer, dilute the titanate coupling agent NDZ-101 with anhydrous isopropanol at a mass ratio of 1:1.5, stir evenly to obtain a pretreatment solution, turn on the high-speed mixer, heat it to 80℃, and spray it evenly in the form of a mist, wherein the amount of titanate coupling agent NDZ-101 is 2% of the mass of diatomaceous earth, after spraying, continue to stir at high speed for 15 minutes, discharge, dry, remove the solvent, and obtain pretreated diatomaceous earth;

[0059] The sound insulation core, pretreated diatomaceous earth, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 60°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 110-130°C to obtain a porous sound-absorbing transition layer coated masterbatch.

[0060] S3: Add the porous sound-absorbing transition layer coating masterbatch, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 50°C, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation at 160-180°C, the product is obtained.

[0061] Preparation Example 3

[0062] The noise reduction masterbatch is a three-layer structure, consisting of a sound-insulating core, a porous absorption transition layer, and a compatible shell, arranged from the inside out. By weight, the sound-insulating core contains 75 parts barium sulfate, 25 parts EVA resin, and 10 parts polyethylene wax; the porous sound-absorbing transition layer contains 55 parts diatomaceous earth, 35 parts EVA resin, and 20 parts polyethylene wax; and the compatible shell contains 85 parts ABS-g-MAH, 20 parts ABS resin, and 8 parts calcium stearate.

[0063] The preparation method of the above-mentioned noise reduction masterbatch includes the following steps:

[0064] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution. Add barium sulfate to a high-speed mixer, heat to 90℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions. The amount of silane coupling agent KH-550 is 2.5% of the mass of barium sulfate. Keep warm and stir for 20 min, and dry to obtain pretreated barium sulfate.

[0065] Pretreated barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 60°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the sound insulation core.

[0066] S2: Place diatomaceous earth in a muffle furnace, heat it to 400℃ at 5℃ / min, calcine for 3 hours, turn off the power and let it cool naturally to below 100℃ in the furnace, take it out and immediately transfer it to a high-speed mixer, dilute the titanate coupling agent NDZ-101 with anhydrous isopropanol at a mass ratio of 1:1.5, stir evenly to obtain a pretreatment solution, turn on the high-speed mixer, heat it to 70℃, and spray it evenly in the form of a mist, wherein the amount of titanate coupling agent NDZ-101 is 1% of the mass of diatomaceous earth, after spraying, continue to stir at high speed for 10 minutes, discharge, dry, remove the solvent, and obtain pretreated diatomaceous earth;

[0067] The sound insulation core is added to a high-speed mixer along with pretreated diatomaceous earth, EVA resin and polyethylene wax. The mixture is stirred at 50°C and then fed into a twin-screw extruder. After melt extrusion and granulation at 110-130°C, a porous sound-absorbing transition layer coated masterbatch is obtained.

[0068] S3: Add the porous sound-absorbing transition layer coating masterbatch, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 45°C, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation at 160-180°C, the product is obtained.

[0069] Preparation Example 4

[0070] The noise reduction masterbatch differs from that in Preparation Example 1 in that it is a two-layer structure noise reduction masterbatch, consisting of a sound-insulating core and a compatible outer shell, arranged sequentially from the inside out. Its preparation method includes the following steps:

[0071] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution, add barium sulfate to a high-speed mixer, heat to 85℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions, wherein the amount of silane coupling agent KH-550 is 2.1% of the mass of barium sulfate, keep warm and stir for 18 min, and dry to obtain pretreated barium sulfate;

[0072] Pretreated barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 65°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the sound insulation core.

[0073] S2: Add the sound insulation core, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 40°C, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation at 160-180°C, the product is obtained.

[0074] Preparation Example 5

[0075] The noise reduction masterbatch differs from that in Preparation Example 1 in that it is a two-layer structure noise reduction masterbatch, consisting of a sound-insulating core and a porous absorption transition layer from the inside out. Its preparation method includes the following steps:

[0076] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution, add barium sulfate to a high-speed mixer, heat to 85℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions, wherein the amount of silane coupling agent KH-550 is 2.1% of the mass of barium sulfate, keep warm and stir for 18 min, and dry to obtain pretreated barium sulfate;

[0077] Pretreated barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 65°C. After discharge, the mixture is added to a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the sound insulation core.

[0078] S2: Place diatomaceous earth in a muffle furnace, heat it to 450℃ at 8℃ / min, calcine for 2.5h, turn off the power and let it cool naturally to below 100℃ in the furnace, take it out and immediately transfer it to a high-speed mixer, dilute the titanate coupling agent NDZ-101 with anhydrous isopropanol at a mass ratio of 1:1.5, stir evenly to obtain a pretreatment solution, turn on the high-speed mixer, heat it to 75℃, and spray it evenly in the form of a mist, wherein the amount of titanate coupling agent NDZ-101 is 1.5% of the mass of diatomaceous earth, after spraying, continue to stir at high speed for 12min, discharge, dry, remove the solvent, and obtain pretreated diatomaceous earth;

[0079] The sound insulation core is added to a high-speed mixer along with pretreated diatomaceous earth, EVA resin, and polyethylene wax. The mixture is stirred at 55°C, and then fed into a twin-screw extruder. After melt extrusion and granulation at 110-130°C, the final product is obtained.

[0080] Preparation Example 6

[0081] The noise reduction masterbatch differs from that in Preparation Example 1 in that its preparation method includes the following steps:

[0082] S1: Dissolve silane coupling agent KH-550 in 90% ethanol aqueous solution, adjust the pH to 4-5 with glacial acetic acid, stir and hydrolyze for 5 min to obtain a pretreated solution, add barium sulfate to a high-speed mixer, heat to 85℃, and uniformly add the pretreated solution by spraying under high-speed stirring conditions, wherein the amount of silane coupling agent KH-550 is 2.1% of the mass of barium sulfate, keep warm and stir for 18 min, and dry to obtain pretreated barium sulfate;

[0083] Pretreated barium sulfate, EVA resin, and polyethylene wax are added to a high-speed mixer and mixed at 65°C. After discharge, the mixture is fed into a twin-screw extruder and melt-extruded and granulated at 120-140°C to obtain the final product.

[0084] Example

[0085] Example 1

[0086] A sound-insulating and noise-reducing modified plastic, by weight, comprises 52.5 parts ABS resin, 18.5 parts styrene-butadiene rubber, 12 parts noise-reducing masterbatch prepared in Preparation Example 1, 8 parts ethylene-methyl acrylate, 3 parts AS-g-MAH, 0.4 parts antioxidant and 0.2 parts silicone powder, wherein the antioxidant is antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1;

[0087] The preparation method of the above-mentioned sound insulation and noise reduction modified plastic includes the following steps:

[0088] Prepare the raw materials according to the proportions, mix ABS resin, styrene-butadiene rubber, noise reduction masterbatch, AS-g-MAH, ethylene-methyl acrylate, antioxidant and silicone powder evenly, and then feed them into a twin-screw extruder. After melt extrusion and granulation, the product is obtained. The extrusion temperature is 220-260℃ and the screw speed is 500-600r / min.

[0089] Example 2

[0090] A sound-insulating and noise-reducing modified plastic, by weight, comprises 45 parts ABS resin, 15 parts styrene-butadiene rubber, 8 parts noise-reducing masterbatch prepared in Preparation Example 1, 6 parts ethylene-methyl acrylate, 2 parts AS-g-MAH, 0.2 parts antioxidant and 0.15 parts silicone powder, wherein the antioxidant is antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1;

[0091] The preparation method of the above-mentioned sound insulation and noise reduction modified plastic includes the following steps:

[0092] Prepare the raw materials according to the proportions, mix ABS resin, styrene-butadiene rubber, noise reduction masterbatch, AS-g-MAH, ethylene-methyl acrylate, antioxidant and silicone powder evenly, and then feed them into a twin-screw extruder. After melt extrusion and granulation, the product is obtained. The extrusion temperature is 220-260℃ and the screw speed is 500-600r / min.

[0093] Example 3

[0094] A sound-insulating and noise-reducing modified plastic, by weight, comprises 65 parts ABS resin, 25 parts styrene-butadiene rubber, 16 parts noise-reducing masterbatch prepared in Preparation Example 1, 12 parts ethylene-methyl acrylate, 5 parts AS-g-MAH, 0.5 parts antioxidant and 0.25 parts silicone powder, wherein the antioxidant is antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1;

[0095] The preparation method of the above-mentioned sound insulation and noise reduction modified plastic includes the following steps:

[0096] Prepare the raw materials according to the proportions, mix ABS resin, styrene-butadiene rubber, noise reduction masterbatch, AS-g-MAH, ethylene-methyl acrylate, antioxidant and silicone powder evenly, and then feed them into a twin-screw extruder. After melt extrusion and granulation, the product is obtained. The extrusion temperature is 220-260℃ and the screw speed is 500-600r / min.

[0097] Example 4

[0098] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that the noise-reducing masterbatch in the raw material is obtained from Preparation Example 2.

[0099] Example 5

[0100] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that the noise-reducing masterbatch in the raw material is prepared by Preparation Example 3.

[0101] Comparative Example

[0102] Comparative Example 1

[0103] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that the noise-reducing masterbatch in the raw material is prepared by Preparation Example 4.

[0104] Comparative Example 2

[0105] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that the noise-reducing masterbatch in the raw material is prepared by Example 5.

[0106] Comparative Example 3

[0107] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that the noise-reducing masterbatch in the raw material is obtained from Preparation Example 6.

[0108] Comparative Example 4

[0109] A sound-insulating and noise-reducing modified plastic differs from Example 2 only in that the amount of noise-reducing masterbatch added to the raw materials is 5 parts.

[0110] Comparative Example 5

[0111] A sound-insulating and noise-reducing modified plastic differs from Example 3 only in that the amount of noise-reducing masterbatch added to the raw materials is 18 parts.

[0112] Comparative Example 6

[0113] A sound-insulating and noise-reducing modified plastic differs from Example 3 only in that the amount of noise-reducing masterbatch added to the raw material is 20 parts.

[0114] Comparative Example 7

[0115] A sound-insulating and noise-reducing modified plastic differs from Example 1 only in that no noise-reducing masterbatch is added to the raw materials.

[0116] Performance testing

[0117] The sound insulation and noise reduction modified plastics obtained in Examples 1-5 and Comparative Examples 1-7 were subjected to the following related performance tests. Each group of tests was conducted 3 times, and the average value of the 3 test results was taken as the final result and recorded in Table 1.

[0118] 1. Noise reduction effect test: The plastic products of each embodiment and comparative example are made into square open boxes of 200×200×200cm. The boxes are placed on the fixture with the open side facing up. A 200g steel ball is dropped freely from 1m above the vertical height to hit the bottom of the box. The noise reduction effect is judged by measuring the sound intensity below with a decibel meter placed inside the box.

[0119] 2. Notched impact strength: Tested according to ISO 180 standard, notch type A;

[0120] 3. Tensile strength: Tested according to ISO 527 standard, with a tensile speed of 50 mm / min;

[0121] 4. Bending strength: Tested according to ISO 178 standard, with a bending rate of 2 mm / min.

[0122] Table 1

[0123] Group Sound intensity / dB <![CDATA[Notched impact strength / kJ / m 2 > Tensile strength / MPa Bending strength / MPa Example 1 52 38.5 42.1 57.6 Example 2 59 35.4 40.7 53.1 Example 3 55 37.2 41.3 55.4 Example 4 53 37.1 41.5 56.8 Example 5 51 38.4 42.9 57.5 Comparative Example 1 71 33.8 37.2 50.3 Comparative Example 2 65 28.6 38.8 48.2 Comparative Example 3 82 25.3 36.5 43.8 Comparative Example 4 65 36.2 42.2 55.0 Comparative Example 5 53 35.7 39.8 53.6 Comparative Example 6 51 33.4 37.6 50.9 Comparative Example 7 96 39.1 43.4 59.1

[0124] According to the performance test results in Table 1, the sound intensity of the plastic products obtained in Examples 1-5 and Comparative Example 7 is between 51-59 dB, which is much lower than that of the group in Comparative Example 7 without the addition of noise reduction masterbatch. The noise reduction masterbatch with a three-layer structure adopted in this application can effectively achieve high sound insulation and damping temperature range in a wider frequency range of plastics, and significantly broaden the noise reduction frequency band of plastic products.

[0125] Furthermore, the addition of noise-reducing masterbatch did not significantly affect the mechanical properties of the plastic products. This also indicates that the three-layer noise-reducing masterbatch of this application forms a core-shell structure with a high-modulus core and a porous low-modulus soft layer, which can achieve the transition of gradient modulus. External loads are buffered and attenuated by the soft layer, effectively preventing the stress concentration problem caused by the addition of inorganic fillers in traditional methods, effectively suppressing the brittle fracture of plastic products, and ensuring the mechanical properties of plastic products.

[0126] The performance test results of Examples 1 and Comparative Examples 1-3 show that the three-layer structure—using high-density barium sulfate as the core to block low-to-medium frequency sound waves, porous diatomaceous earth as the transition layer to block low-to-medium frequency sound waves, and a compatible outer shell—works synergistically with the butyl rubber to form a damping network, significantly enhancing the noise reduction and sound insulation effect of the plastic product. Furthermore, the gradient structure of the hard core, soft layer, and compatible shell formed in the three-layer structure buffers and attenuates impact energy through the soft layer, avoiding stress concentration and achieving high toughness under high filling conditions.

[0127] According to the performance test results of Examples 2-3 and Comparative Examples 4-6, the addition amount of the noise reduction masterbatch of this application can achieve the best sound insulation and noise reduction effect of modified plastic.

[0128] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A sound-insulating and noise-reducing modified plastic, characterized in that, By weight, the raw materials include 45-65 parts ABS resin, 15-25 parts styrene-butadiene rubber, 8-16 parts noise-reducing masterbatch, 6-12 parts toughening agent, 2-5 parts compatibilizer, 0.2-0.5 parts antioxidant and 0.15-0.25 parts lubricant; The noise reduction masterbatch is a three-layer structure, consisting of a sound-insulating core, a porous absorption transition layer, and a compatible outer shell, arranged sequentially from the inside out.

2. The sound-insulating and noise-reducing modified plastic according to claim 1, characterized in that, By weight, the raw materials of the noise reduction masterbatch sound insulation core include 60-75 parts barium sulfate, 15-25 parts EVA resin and 5-10 parts polyethylene wax.

3. The sound-insulating and noise-reducing modified plastic according to claim 2, characterized in that, By weight, the raw materials of the porous sound-absorbing transition layer of the noise-reducing masterbatch include 40-55 parts diatomaceous earth, 25-35 parts EVA resin and 10-20 parts polyethylene wax.

4. The sound-insulating and noise-reducing modified plastic according to claim 3, characterized in that, By weight, the raw materials for the noise reduction masterbatch compatible shell include 70-85 parts ABS-g-MAH, 10-20 parts ABS resin and 3-8 parts calcium stearate.

5. The sound-insulating and noise-reducing modified plastic according to claim 4, characterized in that, The method for preparing the noise reduction masterbatch includes the following steps: S1: The barium sulfate, EVA resin and polyethylene wax are added to a high-speed mixer and mixed at 60-70°C. After discharge, the mixture is added to a twin-screw extruder and obtained as a sound insulation core after melt extrusion and granulation. S2: The sound insulation core is added to a high-speed mixer along with diatomaceous earth, EVA resin and polyethylene wax. The mixture is stirred at 50-60°C. After discharge, it is added to a twin-screw extruder. After melt extrusion and granulation, a porous sound-absorbing transition layer coated masterbatch is obtained. S3: Add the porous sound-absorbing transition layer coating masterbatch, ABS-g-MAH, ABS resin and calcium stearate to a high-speed mixer, mix and stir at 40-50℃, and then add the discharged material to a twin-screw extruder. After melt extrusion and granulation, the product is obtained.

6. The sound-insulating and noise-reducing modified plastic according to claim 1, characterized in that, The toughening agent is selected from at least one of the following: methyl methacrylate / butadiene / styrene copolymer, methyl methacrylate / acrylic polymer, acrylic-silicone rubber toughening agent, ethylene-methyl acrylate, ethylene-butyl acrylate, ethylene-acrylate-glycidyl methacrylate terpolymer, and ethylene-vinyl acetate copolymer-functionalized maleic anhydride.

7. The sound-insulating and noise-reducing modified plastic according to claim 1, characterized in that, The lubricant is selected from at least one of silicone powder, pentaerythritol ester, and ethylene bis-stearamide.

8. The method for preparing the sound-insulating and noise-reducing modified plastic according to any one of claims 1-7, characterized in that, Includes the following steps: Prepare the raw materials according to the proportions, mix ABS resin, styrene-butadiene rubber, noise reduction masterbatch, toughening agent, compatibilizer, antioxidant and lubricant evenly, and then feed them into a twin-screw extruder. After melt extrusion and granulation, the product is obtained. The extrusion temperature is 220-260℃ and the screw speed is 500-600r / min.