Noise-reducing polycarbonate composition and preparation method thereof

Abstract

The invention relates to the technical field of PC / ABS alloy material modification preparation, in particular to a noise reduction polycarbonate composition and a preparation method thereof. The 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 compatilizer, 0.7 part of an antioxidant and 0.3 part of a lubricant, the noise reduction component is composed of a component A and a component B; the component A comprises at least one of PBT (Polybutylene Terephthalate) or PET (Polyethylene Terephthalate); the component B comprises at least one of PCL (Polycaprolactone) and PLA (Polylactic Acid). The component A (PBT or PET) and the component B (PCL and PLA) cooperate with each other, the microstructure of the material is optimized, the strength, flexibility and damping performance of the material are improved, and therefore the noise reduction performance of the material is jointly enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of modified preparation of PC / ABS alloy materials, and in particular 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 is widely used in the fields of automobiles, communications, and home appliances. With the improvement of people's living standards, the automobile consumer market is becoming more and more popular, which has led to a rapid increase in the use of PC / ABS alloy materials in the automotive field. PC / ABS alloy is often used as the preferred material for automotive interior decoration parts such as central control panels, armrests, and air outlets. However, PC / ABS alloy parts will generate noise due to friction during assembly and long-term use. These shortcomings limit its wider application. Summary of the invention

[0003] In order to solve the problem of noise generated by PC / ABS alloy, the present application provides a noise-reducing polycarbonate composition. The present application optimizes the microstructure of the material and improves the strength, flexibility and damping performance of the material through the mutual synergy between component A (PBT or PET) and component B (PCL and PLA), thereby jointly enhancing the noise reduction performance of the material.

[0004] In a first aspect, the present application provides a noise reduction polycarbonate composition, which adopts the following technical solution: A noise reduction polycarbonate composition 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 parts of antioxidant, and 0.3 parts of lubricant; The noise reduction component is composed of component A and component B; The A component includes at least one of PBT or PET; The B component includes at least one of PCL and PLA.

[0005] By adopting the above technical scheme, PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), both of which are thermoplastic polyesters with good physical properties and chemical stability. In the noise reduction 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.

[0006] 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 of noise reduction, mainly play a role through their high damping properties. They can convert vibration and noise energy into heat or other forms of energy and dissipate it, thereby reducing the propagation of noise. The addition of PCL and PLA can also improve the processing properties of the material, making it easier for the material to flow and form during processing, thereby further improving the noise reduction performance of the material.

[0007] The A component (PBT or PET) and the B component (PCL and PLA) work together in the noise reduction composition to enhance the noise reduction performance of the material. PBT or PET provides strength and rigidity, while PCL and PLA provide flexibility and damping performance. The combination of the A component and the B component may further optimize the microstructure of the material, such as forming a denser microstructure or increasing the internal interface of the material, thereby more effectively hindering the propagation of sound.

[0008] This application optimizes the microstructure of the material, improves the strength, flexibility and damping performance of the material through the mutual synergy between component A (PBT or PET) and component B (PCL and PLA), thereby jointly enhancing the noise reduction performance of the material.

[0009] Preferably, the A component is PBT.

[0010] By adopting the above technical solution, PBT has good compatibility with PC / ABS resin. This compatibility enables PBT to be better mixed with PC / ABS resin to form a uniform blend and improve the noise reduction performance of the material. In contrast, PET may have poor compatibility with PC / ABS resin, which may lead to problems such as phase separation or poor interface bonding in the blend, thereby affecting the noise reduction performance of the material.

[0011] Preferably, the weight portion of the PBT is 3-6 parts.

[0012] 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, it may not be able to fully exert its noise reduction effect, 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 PBT may lead to insufficient toughness.

[0013] Preferably, the B component is PCL.

[0014] 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 is a key factor in improving 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 better 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.

[0015] PCL has better toughness than PLA. Toughness is the ability of a material to resist breaking when subjected to external forces, which reflects the material's impact resistance and durability. 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.

[0016] Preferably, the weight portion of the PCL is 6-9 parts.

[0017] By adopting the above technical solution, the addition of PCL can significantly improve the noise reduction performance of the material. When the PCL content is too low, its noise reduction effect may not be fully exerted. PCL has certain toughness and strength, and can form a good balance of mechanical properties with matrix resins such as polycarbonate. When the PCL content 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 PCL content is too high, the relative content of component A will decrease, affecting the overall performance of the material.

[0018] Preferably, the noise reduction polycarbonate composition further comprises an accelerator, and the accelerator comprises at least one of TPU and NBR.

[0019] By adopting the above technical solution, the uniform dispersion of noise reduction components (such as PBT and PCL) in PC / ABS resin is the key to achieving good noise reduction performance. As promoters, TPU and NBR can interact with noise reduction components and PC / ABS resins due to their molecular chain structure, thereby promoting the dispersion of noise reduction components in the resin. This interaction helps to reduce the agglomeration of noise reduction components, allowing 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 noise reduction components and PC / ABS resins. The improvement of compatibility helps to reduce interfacial tension, allowing better bonding between noise reduction components and the resin matrix. This good bonding not only helps to improve the mechanical properties of the material, such as strength and toughness.

[0020] Preferably, the accelerator is TPU.

[0021] By adopting the above technical solution, TPU has better compatibility with PC / ABS, which helps to reduce interfacial tension and promote close bonding 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 an accelerator to the noise-reducing polycarbonate composition, it can significantly improve the toughness of the material.

[0022] Preferably, the weight portion of the TPU is 0.5-1 part.

[0023] By adopting the above technical solution, the addition of TPU can significantly improve the compatibility between the noise reduction component and the PC / ABS resin, and promote the uniform dispersion of the noise reduction component in the resin. When the amount of TPU is too small, it may not be able to fully exert its compatibility and dispersibility, resulting in poor noise reduction effect or decreased material performance. TPU has good toughness, and its addition can significantly improve the impact resistance and wear resistance of the noise reduction polycarbonate composition. TPU with too little amount may not provide sufficient toughness enhancement effect. When the TPU content is too much, it is difficult to further improve the noise reduction performance of the material. For production cost considerations, there is no need to continue to increase the TPU content.

[0024] In a second aspect, the present application provides a method for preparing a noise-reducing polycarbonate composition, using the following technical solution: A method for preparing a noise-reducing polycarbonate composition, for preparing the noise-reducing polycarbonate composition, comprises the following steps: The raw materials are stirred and mixed according to the formula amount, and then extruded and granulated to obtain a noise reduction polycarbonate composition.

[0025] In summary, this application has the following beneficial effects: 1. This application optimizes the microstructure of the material and improves the strength, flexibility and damping performance of the material through the synergy between component A (PBT or PET) and component B (PCL and PLA), thereby jointly enhancing the noise reduction performance of the material; 2. Compared with PET, PBT in component A of the present application can be better mixed with PC / ABS resin to form a uniform blend, thereby improving the noise reduction performance of the material; 3. Compared with PLA, the molecular chain structure of PCL in component B of the present application 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; 4. In this application, TPU and NBR are used as accelerators, and their molecular chain structures can interact with the noise reduction component and PC / ABS resin, thereby promoting the dispersion of the noise reduction component in the resin. This interaction helps to reduce the agglomeration of the noise reduction component, so that the noise reduction component can be more evenly distributed in the resin matrix, thereby improving the overall noise reduction performance of the material. DETAILED DESCRIPTION

[0026] The raw materials in this application include the following parts: PC: polycarbonate, using a commercial product with CAS No. 25037-45-0; ABS: acrylonitrile-butadiene-styrene copolymer, a commercial product with CAS number 9003-56-9; PBT: polybutylene terephthalate, a commercial product with CAS number 26062-94-2; PET: polyethylene terephthalate, a commercial product with CAS number 25038-59-9; PCL: polycaprolactone, a commercial product with CAS number 24980-41-4; PLA: polylactic acid, a commercial product with CAS number 26023-30-3; MBS compatibilizer: Use Japan's Kanebuchi model M-722 compatibilizer; Antioxidant: dilauryl thiodipropionate, distearate thiodipropionate, etc. can be used. This application uses the commercially available product of dilauryl thiodipropionate with CAS number 123-28-4; Lubricant: oleamide, ethylene bis stearamide, etc. can be used. This application uses the commercially available oleamide product with CAS number 3322-62-1; TPU: thermoplastic polyurethane, a commercial product with CAS number 1211-14-9; NBR: Nitrile rubber, a commercial product with CAS number 9006-65-3; The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0027] Example 1 A method for preparing a noise-reducing polycarbonate composition comprises the following steps: 6500g PC, 3000g ABS, 400g PBT, 800g PCL, 300g MBS compatibilizer, 70g antioxidant and 30g lubricant were added into a mixing mixer for stirring and mixing, and then the mixture was extruded and granulated through a twin-screw extruder to obtain a noise-reducing polycarbonate composition; the barrel temperature of the twin-screw extruder was 220-270°C, and the screw speed was 300-700rpm.

[0028] Example 2-3 Example 2-3 Based on the preparation method of Example 1, the content of each component of the noise reduction polycarbonate composition was adjusted, and the specific adjustments are shown in Table 1.

[0029] Comparative Examples 1-3 Comparative Example 1 is based on the preparation method of Example 1, except that 400 g of PBT is not added, and other conditions remain unchanged.

[0030] Comparative Example 2 is based on the preparation method of Example 1, except that 800 g of PCL is not added and other conditions remain unchanged.

[0031] Comparative Example 3 is based on the preparation method of Example 1, except that 400 g of PBT and 800 g of PCL are not added, and other conditions remain unchanged.

[0032] Table 1 Content of each component of the noise reduction polycarbonate composition of Examples 1-3 and performance test table of Comparative Examples 1-3

[0033] Performance testing The following performance tests were performed on Examples 1-3 and Comparative Examples 1-3. The test results are shown in Table 1.

[0034] Noise reduction performance test: each sample was made into a 100*100*100cm open cubic box with a thickness of 2cm on each of the other faces. The box was placed vertically on a fixture, and a 100g steel ball was allowed to freely fall from 1m above the bottom of the box. The sound intensity was tested with a decibel tester placed inside the box to determine the noise reduction effect of the material.

[0035] 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 the addition of PBT and PCL at the same time can effectively improve the noise reduction performance of the material, probably 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 interface of the material, thereby more effectively hindering the propagation of sound. However, when both are added separately, there is a lack of synergistic effect, and the effect of improving the noise reduction performance of the material is low.

[0036] In comparison, the performance of Example 1 is the best, and Example 1 is preferred.

[0037] Embodiment 4-7 In Example 4-7, based on the preparation method of Example 1, the addition amounts of PBT and PCL were adjusted, and the specific adjustments are shown in Table 2.

[0038] 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.

[0039] Table 2 Addition amount of PBT and PCL and performance test table of Example 1 and Examples 4-7

[0040] As shown in Table 2, by comparing Example 1 with Examples 4-7, it can be seen that when the content of PBT or PCL is too low, the noise reduction effect will be reduced. PBT and PCL need to be in a suitable range, especially when the content of PCL is greater than that of PBT, the overall noise reduction effect of the material can be better.

[0041] Embodiment 8-10 Example 8 Based on the preparation method of Example 1, 800g PCL was replaced with 800g PLA, and the other conditions remained unchanged.

[0042] Example 9 Based on the preparation method of Example 1, 400g of PBT is replaced by 400g of PET, and the other conditions remain unchanged.

[0043] Example 10 Based on the preparation method of Example 1, 800g PCL is replaced by 800g PLA, 400g PBT is replaced by 400g PET, and other conditions remain unchanged.

[0044] The noise reduction polycarbonate compositions of Examples 8-10 were subjected to performance tests, and the test results are shown in Table 3.

[0045] Performance Testing Tensile strength: According to ASTM D-638 standard, the specimen size is 120 mm in length, 10 mm in width, and 4 mm in thickness. The tensile rate in the experiment is set to 50 mm / min.

[0046] Bending strength: According to ASTM D-790 standard, the specimen size is 80mm in length, 10mm in width, 4mm in thickness, the stroke rate is set at 2mm / min, and the span is 52cm.

[0047] Table 3 Performance test table of Example 1 and Examples 8-10

[0048] Referring to Table 3, by comparing Example 1 with Examples 8-10, it can be seen that PBT and PCL have the best matching effect. Compared with PET, PBT may have better compatibility with PC / ABS resin. This compatibility enables PBT to be better mixed with PC / ABS resin to form a uniform blend and improve the noise reduction performance of the material.

[0049] Compared with PLA, PCL's molecular chain structure enables the material to better absorb and dissipate vibration energy when subjected to external force, thereby reducing the generation of noise. In addition, PCL has better toughness than PLA.

[0050] Examples 11-16 Example 11 is based on the preparation method of Example 1, but 100 g of TPU is added and blended with other raw materials, and other conditions remain unchanged.

[0051] In Examples 12-15, based on the preparation method of Example 11, the amount of TPU added was adjusted, and the specific adjustments are shown in Table 4.

[0052] Example 11 is based on the preparation method of Example 1, but 100 g of NBR is added and blended with other raw materials, while other conditions remain unchanged.

[0053] The noise reduction polycarbonate compositions of Examples 11-16 were subjected to the above performance tests, and the test results are shown in Table 4.

[0054] Table 4: Addition amount and performance test table of TPU in Example 1 and Examples 11-16

[0055] Referring to Table 4, by comparing Example 1 with Examples 11-16, it can be seen that the addition of TPU or NBR can further improve the noise reduction performance and toughness of the material.

[0056] As the amount of TPU added continues to increase, the noise reduction performance, tensile strength and flexural strength of the noise reduction polycarbonate composition show a trend of gradually increasing and then tending to a stable state. This may be because as the amount of TPU added continues to increase, the compatibility between the noise reduction component and the PC / ABS resin can be significantly improved, and the noise reduction component can be evenly dispersed in the resin, thereby improving its overall performance.

[0057] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A noise reducing polycarbonate composition, characterized in that: The invention 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 parts of antioxidant and 0.3 parts of lubricant; The noise reduction component is composed of component A and component B; The A component includes at least one of PBT or PET; The B component includes at least one of PCL and PLA.

2. The noise reduction polycarbonate composition according to claim 1, characterized in that: The A component is PBT.

3. The noise reduction polycarbonate composition according to claim 2, characterized in that: The weight portion of the PBT is 3-6 parts.

4. The noise reduction polycarbonate composition according to claim 1, characterized in that: The B component is PCL.

5. The noise reduction polycarbonate composition according to claim 4, characterized in that: The weight portion of the PCL is 6-9 parts.

6. The noise reduction polycarbonate composition according to claim 1, characterized in that: Also included is an accelerator, which includes at least one of TPU and NBR.

7. The noise reduction polycarbonate composition according to claim 6, characterized in that: The accelerator is TPU.

8. The noise reduction polycarbonate composition according to claim 7, characterized in that: The weight portion of the TPU is 0.5-1 part.

9. The method for preparing the noise reducing polycarbonate composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: The raw materials are stirred and mixed according to the formula amount, and then extruded and granulated to obtain a noise reduction polycarbonate composition.

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