A noise-reducing polycarbonate composition and its preparation method

Abstract

This application relates to the technical field of PC / ABS alloy material modification and preparation, and specifically relates to a noise-reducing polycarbonate composition and a preparation method thereof. A noise-reducing polycarbonate composition comprises the following components in parts by weight: 65 parts of PC, 25 - 35 parts of ABS resin, 5 - 15 parts of a noise-reducing component, 2.5 - 3.5 parts of an MBS compatibilizer, 0.7 part of an antioxidant, and 0.3 part of a lubricant; the noise-reducing component is composed of component A and component B together; component A comprises at least one of PBT or PET; component B comprises at least one of PCL and PLA. Through the mutual cooperation between component A (PBT or PET) and component B (PCL and PLA), this application optimizes the microstructure of the material, improves the strength, flexibility and damping performance of the material, and thus jointly enhances the noise-reducing performance of the material.

Description

Technical Field

[0001] This application relates to the technical field of PC / ABS alloy material modification and preparation, and specifically relates to a noise-reducing polycarbonate composition and a preparation method thereof. Background Art

[0002] PC / ABS combines the excellent properties of PC and ABS and has a wide range of applications in the fields of automobiles, communications, and household appliances. With the improvement of people's living standards, the automobile consumption market is becoming increasingly booming, which has led to a rapid increase in the usage of PC / ABS alloy materials in the automotive field. PC / ABS alloy is often the preferred material for automotive interior decoration parts such as the center console panel, armrest, and air outlet. However, PC / ABS alloy parts will generate noise due to friction during assembly and long-term use, and these disadvantages limit its wider application. Summary of the Invention

[0003] In order to solve the problem of noise generation in PC / ABS alloy, this application provides a noise-reducing polycarbonate composition. In this application, through the mutual cooperation between component A (PBT or PET) and component B (PCL and PLA), the microstructure of the material is optimized, and the strength, flexibility, and damping performance of the material are improved, thereby jointly enhancing the noise-reducing performance of the material.

[0004] In the first aspect, this application provides a noise-reducing polycarbonate composition, adopting the following technical solution:

[0005] A noise-reducing polycarbonate composition, comprising the following components in parts by weight: 65 parts of PC, 25 - 35 parts of ABS resin, 5 - 15 parts of noise-reducing component, 2.5 - 3.5 parts of MBS compatibilizer, 0.7 part of antioxidant, and 0.3 part of lubricant;

[0006] The noise-reducing component is jointly composed of component A and component B;

[0007] Component A includes at least one of PBT or PET;

[0008] Component B includes at least one of PCL and PLA.

[0009] By adopting the above technical solution, PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), both of these materials are thermoplastic polyesters and have good physical properties and chemical stability. In the noise-reducing composition, PBT or PET can be used as a reinforcing phase to improve the overall strength and rigidity of the material. More importantly, they may affect the propagation path and speed of sound in the material by changing the internal structure of the material, such as increasing the density of the material or changing the microscopic morphology of the material, thereby achieving the effect of noise reduction.

[0010] PCL (Polycaprolactone) is a biodegradable plastic with good flexibility and damping properties. PLA (Polylactic acid) is also a bio-based plastic with excellent mechanical properties and processability. In the noise reduction composition, PCL and PLA, as key components for noise reduction, mainly play their roles through their high damping properties. They can convert vibration and noise energy into heat energy or other forms of energy and dissipate it, thereby reducing the propagation of noise. The addition of PCL and PLA can also improve the processability of the material, making the material easier to flow and form during processing, thus further enhancing the noise reduction performance of the material.

[0011] Component A (PBT or PET) and Component B (PCL and PLA) synergistically cooperate with each other in the noise reduction composition to jointly enhance the noise reduction performance of the material. PBT or PET provides strength and rigidity, while PCL and PLA provide flexibility and damping properties. The combination of Component A and Component B may further optimize the microstructure of the material, such as forming a denser micro-morphology or increasing the internal interfaces of the material, thereby more effectively hindering the propagation of sound.

[0012] In this application, through the synergistic cooperation between Component A (PBT or PET) and Component B (PCL and PLA), the microstructure of the material is optimized, and the strength, flexibility and damping properties of the material are improved, thereby jointly enhancing the noise reduction performance of the material.

[0013] Preferably, Component A is PBT.

[0014] By adopting the above technical solution, PBT has good compatibility with PC / ABS resin. This compatibility enables PBT to mix better with PC / ABS resin, form a uniform blend, and improve the noise reduction performance of the material. In contrast, the compatibility between PET and PC / ABS resin may be poor, which may lead to problems such as phase separation or poor interfacial bonding in the blend, thereby affecting the noise reduction performance of the material.

[0015] Preferably, the weight portion of the PBT is 3 - 6 parts.

[0016] By adopting the above technical solution, the addition of PBT helps to improve the noise reduction performance of the material. When the amount of PBT is too small, its noise reduction effect may not be fully exerted, resulting in the overall noise reduction performance of the composition not meeting the standard. The addition of PBT will change the overall performance of the composition, and too much amount may lead to insufficient toughness.

[0017] Preferably, Component B is PCL.

[0018] By adopting the above technical solutions, the addition of PCL (polycaprolactone) and PLA (polylactic acid) will increase the viscoelasticity and internal friction of the material, which are the key factors for the improvement of noise reduction performance. Viscoelastic materials can deform when subjected to external forces and absorb and dissipate vibration energy through the interaction between molecular chains. PCL shows more excellent performance in this regard. Its molecular chain structure enables the material to better absorb and dissipate vibration energy when subjected to external forces, thereby reducing the generation of noise.

[0019] PCL has better toughness than PLA. Toughness is the ability of a material to resist fracture when subjected to external forces, which reflects the impact resistance and durability of the material. The high toughness of PCL enables the material to better absorb and disperse energy when subjected to external forces, thereby reducing the occurrence of cracks and fractures. This high toughness not only improves the durability of the material but also helps to better absorb and dissipate vibration energy during the noise reduction process.

[0020] Preferably, the weight part of the PCL is 6-9 parts.

[0021] By adopting the above technical solutions, the addition of PCL can significantly improve the noise reduction performance of the material. When the content of PCL is too low, its noise reduction effect may not be fully exerted. PCL has certain toughness and strength and can form a good mechanical property balance with matrix resins such as polycarbonate. When the content of PCL is too low, it may lead to a decrease in the overall mechanical properties of the material, such as insufficient toughness and reduced strength. When the content of PCL is too high, it will cause a decrease in the relative content of component A, affecting the overall performance of the material.

[0022] Preferably, the noise reduction polycarbonate composition further includes a promoter, and the promoter includes at least one of TPU and NBR.

[0023] By adopting the above technical solutions, the uniform dispersion of noise reduction components (such as PBT and PCL) in the PC / ABS resin is the key to achieving good noise reduction performance. As promoters, the molecular chain structures of TPU and NBR can form interactions with the noise reduction components and the PC / ABS resin, thereby promoting the dispersion of the noise reduction components in the resin. This interaction helps to reduce the agglomeration phenomenon of the noise reduction components, enabling the noise reduction components to be more evenly distributed in the resin matrix, thereby improving the overall noise reduction performance of the material. The addition of TPU and NBR can also improve the compatibility between the noise reduction components and the PC / ABS resin. The improvement of compatibility helps to reduce the interfacial tension, enabling the noise reduction components to better combine with the resin matrix. This good combination not only helps to improve the mechanical properties of the material, such as strength and toughness.

[0024] Preferably, the promoter is TPU.

[0025] By adopting the above technical solution, the compatibility between TPU and PC / ABS is better, which helps to reduce the interfacial tension and promote the close combination between TPU and PC / ABS. During the blending process, TPU can be more effectively dispersed in the PC / ABS resin matrix to form a uniform and stable blend. TPU has excellent toughness and elasticity. When TPU is added as a promoter to the noise-reducing polycarbonate composition, it can significantly improve the toughness of the material.

[0026] Preferably, the weight part of the TPU is 0.5 - 1 part.

[0027] By adopting the above technical solution, the addition of TPU can significantly improve the compatibility between the noise-reducing component and the PC / ABS resin, and promote the uniform dispersion of the noise-reducing component in the resin. When the amount of TPU is too small, its compatibility and dispersibility may not be fully exerted, resulting in poor noise reduction effect or deterioration of material properties. TPU has good toughness, and its addition can significantly improve the impact resistance and wear resistance of the noise-reducing polycarbonate composition. Too little TPU may not provide sufficient toughness enhancement effect. When the content of TPU is too high, it is difficult to further improve the noise reduction performance of the material. Considering the production cost, there is no need to continue increasing the content of TPU.

[0028] In a second aspect, the present application provides a preparation method of a noise-reducing polycarbonate composition, adopting the following technical solution:

[0029] A preparation method of a noise-reducing polycarbonate composition for preparing the above noise-reducing polycarbonate composition, comprising the following steps:

[0030] Stir and mix the raw materials according to the formula amount, and then carry out extrusion granulation to obtain the noise-reducing polycarbonate composition.

[0031] In summary, the present application has the following beneficial effects:

[0032] 1. In the present application, through the mutual cooperation between component A (PBT or PET) and component B (PCL and PLA), the microstructure of the material is optimized, and the strength, flexibility and damping performance of the material are improved, thereby jointly enhancing the noise reduction performance of the material;

[0033] 2. In the present application, PBT in component A can be better mixed with the PC / ABS resin than PET to form a uniform blend, improving the noise reduction performance of the material;

[0034] 3. In the present application, the molecular chain structure of PCL in component B compared with PLA enables the material to better absorb and dissipate vibration energy when subjected to external force, thereby reducing the generation of noise; and PCL has better toughness;

[0035] 4. In this application, TPU and NBR are additionally used as accelerators. Their molecular chain structures can interact with the noise reduction components and the PC / ABS resin, thereby promoting the dispersion of the noise reduction components in the resin. This interaction helps to reduce the agglomeration of the noise reduction components, enabling the noise reduction components to be more evenly distributed in the resin matrix, thus improving the overall noise reduction performance of the material. Detailed implementation mode

[0036] The raw materials in this application include the following parts:

[0037] PC: Polycarbonate, using a commercially available product with a CAS number of 25037-45-0;

[0038] ABS: Acrylonitrile-butadiene-styrene copolymer, using a commercially available product with a CAS number of 9003-56-9;

[0039] PBT: Polybutylene terephthalate, using a commercially available product with a CAS number of 26062-94-2;

[0040] PET: Polyethylene terephthalate, using a commercially available product with a CAS number of 25038-59-9;

[0041] PCL: Polycaprolactone, using a commercially available product with a CAS number of 24980-41-4;

[0042] PLA: Polylactic acid, using a commercially available product with a CAS number of 26023-30-3;

[0043] MBS compatibilizer: Using a compatibilizer with the model number M-722 from Kaneka Corporation, Japan;

[0044] Antioxidant: It can use dilauryl thiodipropionate, distearyl thiodipropionate, etc. In this application, a commercially available product of dilauryl thiodipropionate with a CAS number of 123-28-4 is used;

[0045] Lubricant: It can use oleamide, ethylene bisstearamide, etc. In this application, a commercially available product of oleamide with a CAS number of 3322-62-1 is used;

[0046] TPU: Thermoplastic polyurethane, using a commercially available product with a CAS number of 1211-14-9;

[0047] NBR: Nitrile rubber, using a commercially available product with a CAS number of 9006-65-3;

[0048] The following further elaborates on this application in combination with examples and comparative examples.

[0049] Example 1

[0050] A preparation method of a noise-reducing polycarbonate composition, comprising the following steps:

[0051] Add 6500 g of PC, 3000 g of ABS, 400 g of PBT, 800 g of PCL, 300 g of MBS compatibilizer, 70 g of antioxidant and 30 g of lubricant into a mixing blender for stirring and mixing, and then extrude and pelletize the mixture through a twin-screw extruder to obtain a noise-reducing polycarbonate composition; the barrel temperature of the twin-screw extruder is 220 - 270 °C, and the screw speed is 300 - 700 rpm.

[0052] Examples 2 - 3

[0053] Based on the preparation method of Example 1, in Examples 2 - 3, the contents of each component of the noise-reducing polycarbonate composition are adjusted, and the specific adjustments are shown in Table 1.

[0054] Comparative Examples 1 - 3

[0055] Based on the preparation method of Example 1, in Comparative Example 1, 400 g of PBT is not added, and other conditions remain unchanged.

[0056] Based on the preparation method of Example 1, in Comparative Example 2, 800 g of PCL is not added, and other conditions remain unchanged.

[0057] Based on the preparation method of Example 1, in Comparative Example 3, 400 g of PBT and 800 g of PCL are not added, and other conditions remain unchanged.

[0058] Table 1 Performance detection table of the contents of each component of the noise-reducing polycarbonate composition in Examples 1 - 3 and that of Comparative Examples 1 - 3

[0059]

[0060] Performance detection test

[0061] Perform the following performance detections on Examples 1 - 3 and Comparative Examples 1 - 3, and the detection results are shown in Table 1.

[0062] Noise reduction performance test: Make each sample into a cube open box with dimensions of 100 * 100 * 100 cm. The thickness of each of the remaining sides of the box is 2 cm. Place the box vertically on a fixture, and let a 100 - g steel ball freely fall from a height of 1 m vertically above to hit the bottom of the box. Judge the noise reduction effect of the material by testing the sound intensity with a decibel tester placed inside the box.

[0063] Referring to Table 1, by comparing Examples 1-3 and Comparative Examples 1-3, it can be seen that the sound intensity of Examples 1-3 is much lower than that of Comparative Examples 1-3, indicating that adding PBT and PCL simultaneously can effectively improve the noise reduction performance of the material. This may be because PBT provides strength and rigidity, while PCL provides flexibility and damping performance. The combination of PBT and PCL may further optimize the microstructure of the material, such as forming a denser microstructure or increasing the internal interfaces of the material, thereby more effectively hindering the propagation of sound. When added separately, the synergistic effect is lacking, and the improvement effect on the noise reduction performance of the material is relatively low.

[0064] Comparatively speaking, the performance of Example 1 is the best, and Example 1 is taken as the preference.

[0065] Examples 4-7

[0066] Based on the preparation method of Example 1, Examples 4-7 adjusted the addition amounts of PBT and PCL. The specific adjustments are shown in Table 2.

[0067] The noise reduction polycarbonate compositions of Examples 4-7 were subjected to the above performance tests, and the test results are shown in Table 2.

[0068] Table 2 Addition amounts of PBT and PCL and performance test table of Example 1 and Examples 4-7

[0069]

[0070] Referring to Table 2, by comparing Example 1 and Examples 4-7, it can be seen that when the content of PBT or PCL is too low, the noise reduction effect will decline. PBT and PCL need to be within a suitable range. Especially when the content of PCL is more than that of PBT, the overall noise reduction effect of the material can be better.

[0071] Examples 8-10

[0072] Based on the preparation method of Example 1, in Example 8, 800 g of PCL was replaced with 800 g of PLA, and the other conditions remained unchanged.

[0073] Based on the preparation method of Example 1, in Example 9, 400 g of PBT was replaced with 400 g of PET, and the other conditions remained unchanged.

[0074] Based on the preparation method of Example 1, in Example 10, 800 g of PCL was replaced with 800 g of PLA, and 400 g of PBT was replaced with 400 g of PET, and the other conditions remained unchanged.

[0075] The noise reduction polycarbonate compositions of Examples 8-10 were subjected to performance tests, and the test results are shown in Table 3.

[0076] Performance test

[0077] Tensile strength: According to ASTM D - 638 standard, the dimensions of the specimen are 120 mm in length, 10 mm in width, and 4 mm in thickness. The tensile rate in the experiment is set at 50 mm / min.

[0078] Flexural strength: According to ASTM D - 790 standard, the dimensions of the specimen are 80 mm in length, 10 mm in width, and 4 mm in thickness. The stroke rate is set at 2 mm / min, and the span is 52 cm.

[0079] Table 3 Performance test table of Example 1 and Examples 8 - 10

[0080]

[0081] Referring to Table 3, by comparing Example 1 with Examples 8 - 10, it is found that the combination of PBT and PCL has the best effect. Compared with PBT and PET, it may be because PBT has better compatibility with PC / ABS resin. This compatibility enables PBT to mix better with PC / ABS resin, forming a uniform blend and improving the noise reduction performance of the material.

[0082] Compared with PCL and PLA, the molecular chain structure of PCL enables the material to better absorb and dissipate vibration energy when subjected to external forces, thereby reducing the generation of noise. And PCL has better toughness than PLA.

[0083] Examples 11 - 16

[0084] On the basis of the preparation method of Example 1, Example 11 also adds 100 g of TPU and blends it with other raw materials, with the remaining conditions unchanged.

[0085] On the basis of the preparation method of Example 11, the addition amounts of TPU in Examples 12 - 15 are adjusted, and the specific adjustments are shown in Table 4.

[0086] On the basis of the preparation method of Example 1, Example 11 also adds 100 g of NBR and blends it with other raw materials, with the remaining conditions unchanged.

[0087] The noise - reducing polycarbonate compositions of Examples 11 - 16 are subjected to the above - mentioned performance tests, and the test results are shown in Table 4.

[0088] Table 4 Addition amounts of TPU in Example 1 and Examples 11 - 16 and performance test table

[0089]

[0090] Referring to Table 4, by comparing Example 1 with Examples 11-16, it can be seen that adding TPU or NBR additionally can further improve the noise reduction performance and toughness of the material.

[0091] As the addition amount of TPU increases continuously, the noise reduction performance, tensile strength and flexural strength of the noise reduction polycarbonate composition show a trend of increasing gradually first and then leveling off. This may be because as the addition amount of TPU increases continuously, the compatibility between the noise reduction component and the PC / ABS resin can be significantly improved, and the uniform dispersion of the noise reduction component in the resin can be promoted, thereby improving its overall performance.

[0092] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A noise-reducing polycarbonate composition, characterized in that, It comprises the following components in parts by weight: 65 parts of PC, 25 - 35 parts of ABS resin, 5 - 15 parts of noise reduction component, 2.5 - 3.5 parts of MBS compatibilizer, 0.7 part of antioxidant, and 0.3 part of lubricant; The noise reduction component is composed of component A and component B together; Component A comprises at least one of PBT or PET; Component B comprises at least one of PCL and PLA; When component A is PBT, the parts by weight of PBT are 3 - 6 parts; It further comprises a promoter, and the promoter comprises at least one of TPU and NBR.

2. The noise-reducing polycarbonate composition according to claim 1, wherein: Component B is PCL.

3. The noise-reducing polycarbonate composition according to claim 2, characterized in that: The parts by weight of PCL are 6 - 9 parts.

4. The noise-reducing polycarbonate composition according to claim 1, wherein: The promoter is TPU.

5. The noise-reducing polycarbonate composition according to claim 4, characterized in that: The parts by weight of TPU are 0.5 - 1 part.

6. The method for preparing the noise-reducing polycarbonate composition according to any one of claims 1-5, characterized in that, It comprises the following steps: Stir and mix the raw materials according to the formula amount, and then carry out extrusion granulation to obtain the noise reduction polycarbonate composition.

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