PC-ABS (polycarbonate-acrylonitrile butadiene styrene) composition as well as preparation method and application thereof

Abstract

The invention discloses a PC-ABS (polycarbonate-acrylonitrile-butadiene-styrene) composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The PC-ABS composition is prepared from the following components in parts by weight: 48 to 77 parts of PC resin, 5 to 30 parts of ABS resin, 0.5 to 2 parts of porous mineral, 4.5 to 18 parts of flaky mineral, 1 to 6 parts of abnormal sound prevention aid and 2 to 6 parts of toughening agent. According to the PC-ABS composition disclosed by the invention, the PC resin and the ABS resin are used as main materials, and are compounded with the mineral powder, the abnormal sound prevention auxiliary agent and the toughening agent, so that the prepared PC-ABS composition has excellent mechanical properties, fluidity and heat resistance, and has the advantages of good abnormal sound prevention performance, low odor, low VOC volatilization, environmental protection and the like. The preparation method of the PC-ABS composition is simple, efficient, convenient to operate and beneficial to large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a PC-ABS composition, a preparation method thereof, and an application thereof. Background Art

[0002] Currently, automotive instrument panel trim parts are generally made of PC / ABS alloy materials. With the development of automotive styling, the length of automotive instrument panel trim parts has changed from the original 500 mm to more than 1000 mm. Although such a long-size design enhances the sense of technology, it also brings some material technology problems. In scenarios where the environment undergoes a drastic temperature change, long-size instrument panel trim parts prepared from existing PC / ABS materials are prone to significant changes in part dimensions, resulting in an increase in the surface difference of parts, and even cracking is likely to occur at positions with relatively high stress. Existing PC / ABS materials contain small-molecule substances that cannot be completely volatilized, and are prone to emitting unpleasant odors in a high-temperature environment, which has always been a difficult problem in the industry. In addition, in an environment with a sudden temperature change, the instrument panel trim part will slide relative to the contact part, resulting in abnormal noise; the above-mentioned part dimension changes, stress cracking, poor odor emission, and abnormal noise caused by the drastic temperature change.

[0003] Currently, in order to solve the problem of drastic dimension change caused by temperature, mainly by adding mineral powder to PC / ABS to reduce the CLTE of the material, thereby reducing the degree of "thermal expansion and contraction" of the material. However, adding mineral powder will increase the surface hardness of the material and increase the risk of abnormal noise. In addition, the instrument panel trim part requires a certain degree of heat resistance, which is beneficial to improving the heat resistance of the material, but will exacerbate the risk of stress cracking resistance. In order to improve the stress cracking resistance characteristics of the material, the stress is reduced by increasing the content of ABS, but the heat resistance of the material is sacrificed. Summary of the Invention

[0004] Based on the defects existing in the prior art, the purpose of the present invention is to provide a PC-ABS composition, a preparation method thereof, and an application thereof. The PC-ABS composition has excellent mechanical properties, heat resistance, and fluidity, and also has advantages such as good anti-abnormal noise performance, low odor, low VOC volatilization, environmental protection, etc., and good processing performance.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, a PC-ABS composition provided by the present invention is characterized by comprising the following components in parts by weight: 48-77 parts of PC resin, 5-30 parts of ABS resin, 0.5-2 parts of porous mineral, 4.5-18 parts of flaky mineral, 1-6 parts of anti-rattling aid, and 2-6 parts of toughening agent. The anti-rattling aid is at least one of silicone, POE-g-MAH, block copolymer of styrene-ethylene / butene, and styrene / acrylonitrile-vinyl graft copolymer. The particle size D of the flaky mineral 95 is not greater than 11 μm, and the specific surface area of the flaky mineral is not less than 10 m 2 / g; the porosity of the porous mineral is not less than 90%.

[0007] The PC-ABS composition of the present invention uses PC resin and ABS resin as the main materials, and is compounded with porous mineral, flaky mineral, anti-rattling aid and toughening agent, so that the prepared PC-ABS composition has excellent mechanical properties, fluidity and heat resistance, and has the advantages of good anti-rattling performance, low odor, low VOC volatilization, and environmental protection.

[0008] The molecular chain of the anti-rattling aid introduced in the present invention contains flexible segments, has appropriate compatibility with PC resin and ABS resin, can migrate to the material surface, improve the damping performance of the composition, and achieve the purpose of anti-rattling.

[0009] In the present invention, the mass percentage of the PC resin in the PC-ABS composition is not less than 54%.

[0010] Preferably, the number-average molecular weight of the PC resin is 19,000-27,000. For example, the number-average molecular weight of the PC resin is 19,000, 20,000, 21,000, 22,000, 23,000, 24,000, 25,000, 26,000, 27,000 or the range composed of any two sets of values among them.

[0011] The PC resin includes bisphenol A polycarbonate resin.

[0012] Preferably, the mass ratio of the anti-rattling aid to the PC resin is (1-6):(50-75). For example, the mass ratio of the anti-rattling aid to the PC resin can be 3:70, 4:60, 1:50, 6:75 or the range composed of any two sets of mass ratios among them.

[0013] Preferably, the mass ratio of the porous mineral to the PC resin is (0.5-2):(50-75). For example, the mass ratio of the porous mineral to the PC resin can be 1.6:70, 1.2:60, 0.5:50, 2:75 or the range composed of any two sets of mass ratios among them.

[0014] Preferably, the particle size of the porous mineral is 600 - 750 mesh, and the porosity is 90% - 92%.

[0015] Preferably, the particle size D of the flaky mineral 95 is 9 - 11 μm, and the specific surface area is 10 - 13 m 2 / g.

[0016] In the present invention, the particle size D of the flaky mineral 95 can be 9 μm, 9.5 μm, 10 μm, 10.5 μm, 11 μm or a range composed of any two sets of these values; the specific surface area of the flaky mineral can be 10 m 2 / g, 10.5 m 2 / g, 11 m 2 / g, 12 m 2 / g, 12.5 m 2 / g, 13 m 2 / g or a range composed of any two sets of these values.

[0017] Preferably, the porous mineral includes at least one of diatomite and zeolite.

[0018] Preferably, the flaky mineral includes at least one of talc powder and mica powder.

[0019] The inventors have found through research that controlling the particle size and porosity of the porous mineral and the particle size and specific surface area of the flaky mineral within appropriate ranges can not only reduce odors and reduce VOC volatilization, but also effectively improve the anti-fatigue property and notched impact strength of the composition.

[0020] Preferably, the anti-rattle additive is silicone or styrene / acrylonitrile-vinyl graft copolymer.

[0021] The inventors have found through research that if the anti-rattle additive is silicone or styrene / acrylonitrile-vinyl graft copolymer, the comprehensive performance of the PC-ABS composition is better.

[0022] Preferably, the toughening agent includes at least one of acrylonitrile-butadiene-styrene copolymer, methacrylate-butadiene-styrene copolymer, alkyl methacrylate-siloxane / acrylic alkyl ester graft copolymer, and styrene-ethylene / butene copolymer.

[0023] Preferably, the PC-ABS composition comprises the following components in parts by weight: 60 - 70 parts of PC resin, 10 - 15 parts of ABS resin, 1.2 - 1.6 parts of porous mineral, 10.8 - 14.4 parts of flaky mineral, 3 - 4 parts of anti-rattle additive, and 4 - 5 parts of toughening agent. When the parts by weight of each component are within the above ranges, the comprehensive performance of the PC-ABS composition is better.

[0024] In a second aspect, a method for preparing the PC-ABS composition as described in the first aspect of the present invention includes the following steps:

[0025] Mix the components and then melt-extrude and pelletize to obtain the PC-ABS composition.

[0026] In a third aspect, the present invention provides an application of the PC-ABS composition as described in the first aspect in the preparation of automotive parts.

[0027] In a fourth aspect, the present invention provides an automotive instrument panel trim part containing the PC-ABS composition as described in the first aspect.

[0028] Preferably, the length of the automotive instrument panel trim part is not less than 1000 mm.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] The PC-ABS composition of the present invention uses PC resin and ABS resin as the main materials, and is compounded with mineral powder, anti-rattle additive and toughening agent, so that the obtained PC-ABS composition has excellent mechanical properties, fluidity and heat resistance, and has the advantages of good anti-rattle performance, low odor, low VOC emission and environmental protection. The preparation method of the PC-ABS composition of the present invention is simple and efficient, easy to operate, and is conducive to large-scale production. Specific Embodiments

[0031] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific examples and comparative examples. The purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In the present invention, the test methods for each performance parameter are as follows:

[0033] The test method for porosity is: the test method specified in ISO 9277:2010;

[0034] The test method for particle size D95 is: the test method specified in ISO 13320-1:1999;

[0035] The test method for the melt mass flow rate (MFR) of ABS is: ISO 1133-1:2011, and the test conditions are 220 °C and 10 Kg.

[0036] The test method for number-average molecular weight is as follows: Measurement is carried out by high-temperature gel permeation chromatography, and the test standard is SN / T 3002-2011.

[0037] The source information and performance parameters of the components in each example and comparative example are shown in Table 1 below.

[0038] Table 1

[0039]

[0040]

[0041] Unless otherwise specified, the component raw materials used in each example and comparative example of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are all of the same kind.

[0042] Examples 1 to 14

[0043] In the examples of the PC-ABS composition of the present invention, the components and their weight ratios of the PC-ABS composition are shown in Table 2.

[0044] The preparation method of the PC-ABS composition includes the following steps:

[0045] After mixing the components, melt blending and extrusion, and pelletizing are carried out through a twin-screw extruder at 250-280 °C to obtain the PC-ABS composition.

[0046] Table 2 (unit: parts by weight)

[0047]

[0048]

[0049] Comparative Examples 1 to 6

[0050] The difference between each comparative example and the example lies only in the types and ratios of the components, as shown in Table 3.

[0051] Table 3 (unit: parts by weight)

[0052]

[0053]

[0054] In order to verify the performance of the composition of the present invention, the compositions prepared in each example and comparative example are used as samples for the following performance tests:

[0055] (1) Coefficient of linear thermal expansion (CLTE): Test is carried out according to ISO 11359-2:2014, temperature range -30 to 100 °C, flow direction;

[0056] (2) Fatigue resistance: The test specimen is an ISO 1A specimen, and the test is carried out under the conditions of a load of 20 MPa, a frequency of 5 HZ, and a temperature of 23 °C; when the material is pulled to cause slight deformation and then returns to its original state, it is counted as one tensile test, and the specimen is repeatedly pulled until it breaks; the equipment automatically calculates the total number of tensile tests, which is also called the critical fatigue fracture number;

[0057] (3) Anti-abnormal noise: Test according to VDA230-206:2005;

[0058] (4) Heat distortion temperature: Injection-mold a test specimen with dimensions of 80 mm × 10 mm × 4 mm (thickness), and test according to ISO75-2:2013. Test conditions: Load stress 1.8 MPa; Heating rate 2 °C / min. When the specimen bends and deforms by 0.34 mm, record the temperature at this time, which is the heat distortion temperature;

[0059] (5) Odor: Test according to the Volkswagen PV3900:2019-04 standard. Odor evaluation treatment conditions: 80 °C, 2 h;

[0060] (6) Melt mass flow rate (MFR): Test according to ISO 1133-1:2011. Test conditions: 260 °C, 5 Kg;

[0061] (7) Notched impact strength at room temperature: Test according to ISO 180:2019, Type A notch;

[0062] The test results are shown in Table 4.

[0063] Table 4

[0064]

[0065]

[0066] It can be seen from Examples 1 to 14 that the PC-ABS composition of the present invention uses PC resin and ABS resin as the main materials, and is compounded with mineral powder, anti-abnormal noise additive and toughening agent, so that the performance of the prepared PC-ABS composition meets the qualified standards. The weight parts of each component in Examples 1-2 are within the following ranges: 60-70 parts of PC resin, 10-15 parts of ABS resin, 1.2-1.6 parts of porous mineral, 10.8-14.4 parts of flaky mineral, 3-4 parts of anti-abnormal noise additive, 4-5 parts of toughening agent, and the comprehensive performance of the PC-ABS composition is better; while the MFR and notched impact strength at room temperature of Example 4 are relatively poor.

[0067] It can be seen from Example 1, Examples 5 to 6, Comparative Examples 1 to 2 and Comparative Example 6 that by controlling the particle size and porosity of the porous mineral and the particle size and specific surface area of the flaky mineral within appropriate ranges respectively, it is possible to effectively improve the anti-fatigue property and notched impact strength of the composition while reducing the odor level, thereby enhancing the comprehensive performance of the composition.

[0068] It can be seen from Example 1, Examples 9 to 11 and Comparative Examples 3 to 5 that introducing any one of silicone, POE-g-MAH, block copolymer of styrene-ethylene / butenyl, and styrene / acrylonitrile-vinyl graft copolymer into the PC-ABS composition of the present invention as an anti-rattling aid and controlling the addition amount within an appropriate range can significantly improve the anti-rattling property of the composition while ensuring that other properties are qualified. When the anti-rattling aid is silicone or styrene / acrylonitrile-vinyl graft copolymer, the comprehensive performance of the composition is better.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A PC-ABS composition, characterized in that, Comprising the following components in parts by weight: 48-77 parts of PC resin, 5-30 parts of ABS resin, 0.5-2 parts of porous mineral, 4.5-18 parts of flaky mineral, 1-6 parts of anti-rattling additive, 2-6 parts of toughening agent, the anti-rattling additive being at least one of silicone, POE-g-MAH, block copolymer of styrene-ethylene / butenyl, and graft copolymer of styrene / acrylonitrile-vinyl, the particle size D 95 of the flaky mineral is not greater than 11 μm, and the specific surface area of the flaky mineral is not less than 10 m 2 / g; the porosity of the porous mineral is not less than 90%.

2. The PC-ABS composition according to claim 1, wherein The particle size D of the flaky mineral 95 is 9 - 11 μm, and the specific surface area is 10 - 13 m 2 / g.

3. The PC-ABS composition according to claim 1, wherein The anti-abnormal noise additive is silicone or styrene / acrylonitrile-vinyl graft copolymer.

4. The PC-ABS composition according to claim 1, characterized in that, The particle size of the porous mineral is 600-750 mesh, and the porosity is 90%-92%.

5. The PC-ABS composition according to claim 1, wherein The porous mineral includes at least one of diatomite and zeolite. And / or, the flaky mineral includes at least one of talcum powder and mica powder.

6. The PC-ABS composition according to claim 1, characterized in that, The toughening agent includes at least one of acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, alkyl methacrylate-siloxane / alkyl acrylate graft copolymer, and styrene-ethylene / butene copolymer.

7. The PC-ABS composition according to claim 1, wherein It comprises the following components in parts by weight: 60-70 parts of PC resin, 10-15 parts of ABS resin, 1.2-1.6 parts of porous mineral, 10.8-14.4 parts of flaky mineral, 3-4 parts of anti-abnormal noise additive, and 4-5 parts of toughening agent.

8. A method for preparing the PC-ABS composition according to any one of claims 1 to 7, characterized in that, It includes the following steps: Mix the components and then melt-extrude and granulate to obtain the PC-ABS composition.

9. Use of the PC-ABS composition according to any one of claims 1 to 7 in the preparation of automotive parts.

10. An automotive instrument panel trim, characterized in that, Containing the PC-ABS composition according to any one of claims 1 to 7.

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