High-toughness, high-transmittance, high-haze polypropylene alloy material, and preparation method and application thereof

Abstract

This invention relates to a polypropylene alloy material with high toughness, high light transmittance, and high haze. The alloy material comprises 69 to 85 parts by weight of polypropylene, 15 to 30 parts by weight of polybutene-1 elastomer, and 0.5 to 1 part by weight of a light diffusing agent. The polypropylene has a melt index greater than or equal to 30 g / 10 min at 230°C and 2.16 kg; the polybutene-1 elastomer has a melt index of 0.1 g / 10 min to 4.0 g / 10 min at 190°C and 2.16 kg. The polypropylene alloy material provided by this invention, through a reasonable combination of high melt index polypropylene, low melt index polybutene-1 elastomer, and light diffusing agent, can obtain a polypropylene alloy material that simultaneously possesses high toughness, high light transmittance, and high haze. This invention also relates to a method for preparing the above-mentioned polypropylene alloy material and its application, as well as an automotive trim part.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a polypropylene alloy material with high toughness, high light transmittance, and high haze, as well as its preparation method and application. Background Technology

[0002] Polypropylene resin is the world's second most widely used plastic. Its low density, light weight, and excellent mechanical properties make it widely used in packaging, home appliances, and the automotive industry. However, in the home appliance and automotive sectors, conventional polypropylene resins lack sufficient toughness. Furthermore, components such as automotive interior panels and bumper covers often require high light transmittance and high haze to meet aesthetic requirements. Therefore, developing polypropylene resins with high toughness, high light transmittance, and high haze is of significant industrial value.

[0003] The mainstream technical solutions for improving the toughness of polypropylene resin are: (1) random copolymerization, (2) impact copolymerization, and (3) elastomer modification and toughening. Polypropylene resin produced by random copolymerization often has limited toughness, and the room temperature simply supported beam impact strength of high melt index products (melt index above 30 g / 10 min) is difficult to reach 10 kJ / m. 2 In addition, the rigidity of the resin decreases significantly. The impact copolymerization method uses in-reactor alloying to produce related products, but the optical properties of the products are poor, with insufficient light transmittance. The elastomer toughening modification method mainly uses ethylene propylene rubber, vinyl elastomer (POE), and propylene-based elastomers to modify polypropylene. The resulting alloy products have significantly improved toughness, but they also reduce the light transmittance of the polypropylene products to a certain extent, making it difficult to simultaneously achieve high toughness, high light transmittance, and low haze. Summary of the Invention

[0004] Based on the above, one of the objectives of this invention is to provide a polypropylene alloy material that simultaneously possesses high toughness, high light transmittance, and high haze. Products made from this material can be used in automotive interior trim such as ambient lighting panels and bumper covers.

[0005] The second objective of this invention is to provide a method for preparing the above-mentioned high-toughness, high-transmittance, and high-haze polypropylene alloy material.

[0006] The third objective of this invention is to provide an application of the aforementioned high-toughness, high-transmittance, and high-haze polypropylene alloy material for the manufacture of automotive trim parts.

[0007] The fourth objective of this invention is to provide an automotive trim component, comprising a component formed from the aforementioned polypropylene alloy material or a polypropylene alloy material prepared by the aforementioned method.

[0008] Therefore, in a first aspect, the present invention provides a polypropylene alloy material with high toughness, high light transmittance, and high haze, wherein the raw materials of the alloy material include 69 to 85 parts by weight of polypropylene, 15 to 30 parts by weight of polybutene-1 elastomer, and 0.5 to 1 part by weight of light diffusing agent.

[0009] The polypropylene has a melt index of ≥30 g / 10 min at 230°C and 2.16 kg; the polybutene-1 elastomer has a melt index of 0.1 g / 10 min to 4.0 g / 10 min at 190°C and 2.16 kg.

[0010] The polypropylene alloy material provided by this invention, through the reasonable combination of high melt index polypropylene, low melt index polybutene-1 elastomer and light diffusing agent, can obtain a polypropylene alloy material with high toughness, high light transmittance and high haze at the same time. The selection of low melt index polybutene-1 elastomer not only has a good toughening effect on polypropylene alloy material, but also maintains the high light transmittance of alloy material and increases the haze of alloy material.

[0011] As a specific embodiment of the present invention, the melt index of the polybutene-1 is 0.2 g / 10 min to 3.0 g / 10 min, preferably 0.5 g / 10 min to 1.3 g / 10 min.

[0012] As a specific embodiment of the present invention, the crystallinity of the polybutene-1 is 5% to 20%.

[0013] As a specific embodiment of the present invention, the Shore A hardness of the polybutene-1 is 45 to 78.

[0014] As a specific embodiment of the present invention, the glass transition temperature of the polybutene-1 by DSC method is -40℃ to -48℃.

[0015] As a specific embodiment of the present invention, the melt index of the polypropylene at 230°C and 2.16 kg is 30 g / 10 min to 150 g / 10 min.

[0016] As a specific embodiment of the present invention, the flexural modulus of the polypropylene is 1000MPa to 2500MPa.

[0017] As a specific embodiment of the present invention, the polypropylene is homopolymer polypropylene, random copolymer polypropylene or impact copolymer polypropylene, preferably homopolymer polypropylene.

[0018] In a specific embodiment of the present invention, the light diffusing agent is organosilicon microspheres. The present invention selects organosilicon microspheres as a light diffusing agent in combination with polybutene-1, which can further improve the haze of the alloy material while maintaining its high light transmittance.

[0019] As a specific embodiment of the present invention, the particle size of the light diffusing agent is less than or equal to 2.5 micrometers, preferably 1.0 micrometers to 2.5 micrometers.

[0020] As a specific embodiment of the present invention, the alloy material has a melt flow index greater than 30 g / 10 min at 230°C and 2.16 kg; and a room temperature simply supported beam impact strength greater than or equal to 10 kJ / m. 2 Flexural modulus greater than 800 MPa, preferably greater than or equal to 900 MPa; haze greater than 95°, preferably greater than or equal to 98°; light transmittance greater than 85%.

[0021] Therefore, in a second aspect, the present invention provides a method for preparing the above-mentioned polypropylene alloy material, comprising the following steps: mixing polypropylene, polybutene-1 elastomer and light diffusing agent, followed by melt extrusion and granulation to obtain the alloy material.

[0022] As a specific embodiment of the present invention, the mixing conditions include: mixing for 1 min to 5 min using a high-speed mixer.

[0023] As a specific embodiment of the present invention, the twin-screw extruder used in the melt extrusion preferably has the following operating conditions: conveying section 100℃~180℃, homogenization section 180℃~250℃, extrusion temperature 190℃~220℃, die temperature 180℃~230℃, and screw speed 100 rpm~400 rpm.

[0024] Therefore, in a third aspect, the present invention provides the use of the polypropylene alloy material described above or the polypropylene alloy material prepared by the above preparation method for the manufacture of automotive trim parts.

[0025] As a specific embodiment of the present invention, the automotive trim includes an ambient lighting interior panel and a bumper cover.

[0026] Therefore, in a fourth aspect, the present invention provides an automotive trim component comprising a part formed from the aforementioned polypropylene alloy material or a polypropylene alloy material prepared by the aforementioned preparation method.

[0027] As a specific embodiment of the present invention, the automotive trim includes an ambient lighting interior panel and a bumper cover.

[0028] This invention has the following advantages:

[0029] The polypropylene alloy material provided by this invention can simultaneously meet the product application requirements of high toughness, high light transmittance, and high haze. The alloy material has a melt flow index greater than 30 g / 10 min at 230°C and 2.16 kg, and a room temperature simply supported beam impact strength greater than or equal to 10 kJ / m. 2The flexural modulus is greater than 800 MPa, the haze is greater than 95°, and the light transmittance is greater than 85%. Detailed Implementation

[0030] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the examples are performed under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products. Unless otherwise specified, the test methods are all conventional methods, and the instrument settings are all those recommended by the manufacturer.

[0031] (I) Main raw materials:

[0032] Homopolymer polypropylene resin M60T: Zhenhai Refining & Chemical, melt index 60g / 10min, flexural modulus 1850MPa;

[0033] Polybutene-1 resin KT-AR05: LyondellBasell, melt index 0.5 g / 10 min, Shore hardness A78;

[0034] Polybutene-1 resin KT-MR05: LyondellBasell, melt index 1.3 g / 10 min, Shore hardness A60;

[0035] Polybutene-1 resin DP-8510M: LyondellBasell, melt index 40 g / 10 min, flexural modulus 120 MPa;

[0036] Vinyl elastomer resin 8150: Dow Chemical, melt index 0.5 g / 10 min, Shore hardness A70;

[0037] Acrylic elastomer resin 6102: ExxonMobil, melt index 1.4 g / 10 min, Shore hardness A67;

[0038] Organosilicon microspheres KMP-590: Shin-Etsu Chemical Co., Ltd., Japan, with a particle size of 2.0 μm.

[0039] (II) Analytical Methods

[0040] Notched impact strength of simply supported beam at room temperature: The test method refers to GB / T 1043.1-2008. A rectangular strip of 4mm×10mm×80mm is prepared under the conditions of injection temperature of 200℃, injection time of 45s and injection pressure of 5MPa. A type A notch is prepared by machining the rectangular strip. After being stored in a constant temperature and humidity chamber for 48hr, the notched impact strength of the simply supported beam is measured.

[0041] Flexural modulus: The test method refers to GB / T 9341-2008. A rectangular strip of 4mm×10mm×80mm was prepared under the conditions of injection temperature of 200℃, injection time of 45s and injection pressure of 5MPa. After being stored in a constant temperature and humidity chamber for 48hr, the flexural modulus was measured.

[0042] Transmittance and haze testing: The test method refers to GB / T 2410-2008. A 3mm thin plate sample was prepared under the conditions of injection temperature of 200℃, injection time of 45s and injection pressure of 5MPa. After being stored in a constant temperature and humidity chamber for 48hr, the transmittance and haze were tested.

[0043] Melt flow index (MI): The test method is in accordance with GB / T 3682.1-2018, and the test conditions are a temperature of 230℃ and a load of 2.16kg.

[0044] Example 1

[0045] 69 parts by weight of homopolymer polypropylene resin M60T, 30 parts by weight of polybutene-1 resin KT-AR05, and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 200℃, and the die temperature was 200℃. The mixture was then drawn into strips and granulated to form polypropylene alloy resin granules.

[0046] Example 2

[0047] 84.5 parts by weight of homopolymer polypropylene resin M60T, 30 parts by weight of polybutene-1 resin KT-MR05, and 0.5 parts by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin granules.

[0048] Example 3

[0049] 79 parts by weight of homopolymer polypropylene resin M60T, 20 parts by weight of polybutene-1 resin KT-AR05, and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin granules.

[0050] Comparative Example 1

[0051] 80 parts by weight of homopolymer polypropylene resin M60T and 20 parts by weight of polybutene-1 resin KT-AR05 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion and blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin granules.

[0052] Comparative Example 2

[0053] 99 parts by weight of homopolymer polypropylene resin M60T and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin particles.

[0054] Comparative Example 3

[0055] 79 parts by weight of homopolymer polypropylene resin M60T, 20 parts by weight of vinyl elastomer resin 8150 and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin granules.

[0056] Comparative Example 4

[0057] 79 parts by weight of homopolymer polypropylene resin M60T, 20 parts by weight of polybutene-1 resin DP-8510M, and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin granules.

[0058] Comparative Example 5

[0059] 79 parts by weight of homopolymer polypropylene resin M60T, 20 parts by weight of propylene-based elastomer resin 6102, and 1 part by weight of organosilicon microspheres KMP-590 were added to a high-speed mixer and mixed at high speed for 2 minutes. Then, the mixture was added to a twin-screw extruder for blending and granulation. The extrusion blending time was 10 minutes. The conveying section temperature was 180℃, the homogenization section temperature was 220℃, the extrusion temperature was 220℃, the die temperature was 200℃, and the mixture was drawn into strips and granulated to form polypropylene alloy resin particles.

[0060] The composition of the polypropylene alloy resin particles prepared in each embodiment and comparative example is shown in Table 1, and the performance data is shown in Table 2.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] As shown in Tables 1 and 2, the polypropylene alloys prepared in Examples 1-3 possess high toughness, high light transmittance, and high haze.

[0066] Compared to Example 3, Comparative Example 1 did not add a light diffusing agent, and the resulting polypropylene alloy had relatively low haze.

[0067] Compared to Example 3, Comparative Example 2 did not add polybutene-1 elastomer, and the resulting polypropylene alloy had insufficient impact strength.

[0068] Compared to Example 3, Comparative Example 3 replaced the low melt flow index polybutene-1 elastomer with a low melt flow index vinyl elastomer, resulting in a polypropylene alloy with insufficient light transmittance.

[0069] In Comparative Example 4, compared to Example 3, the low melt flow index polybutene-1 elastomer was replaced with a high melt flow index polybutene-1 random product, and the resulting polypropylene alloy had insufficient haze and impact strength.

[0070] Compared to Example 3, Comparative Example 5 replaced the low melt flow index polybutene-1 elastomer with a low melt flow index propylene-based elastomer, resulting in a polypropylene alloy with insufficient light transmittance.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and apply the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A polypropylene alloy material with high toughness, high light transmittance, and high haze, characterized in that, The raw materials for the alloy material include 69 to 85 parts by weight of polypropylene, 15 to 30 parts by weight of polybutene-1 elastomer, and 0.5 to 1 part by weight of light diffusing agent. The polypropylene has a melt index of ≥30 g / 10 min at 230°C and 2.16 kg; the polybutene-1 elastomer has a melt index of 0.1 g / 10 min to 4.0 g / 10 min at 190°C and 2.16 kg.

2. The alloy material according to claim 1, characterized in that, The crystallinity of the polybutene-1 is 5% to 20%; And / or, the melt index of the polybutene-1 is from 0.2 g / 10 min to 3.0 g / 10 min, preferably from 0.5 g / 10 min to 1.3 g / 10 min; And / or, the Shore A hardness of the polybutene-1 is 45 to 78; And / or, the glass transition temperature of the polybutene-1 by DSC is -40℃ to -48℃.

3. The alloy material according to claim 1 or 2, characterized in that, The polypropylene has a melt flow index of 30 g / 10 min to 150 g / 10 min at 230 °C and 2.16 kg. And / or, the flexural modulus of the polypropylene is 1000 MPa to 2500 MPa.

4. The alloy material according to any one of claims 1-3, characterized in that, The polypropylene is homopolymer polypropylene, random copolymer polypropylene, or impact copolymer polypropylene, preferably homopolymer polypropylene.

5. The alloy material according to any one of claims 1-4, characterized in that, The light diffusing agent is an organosilicon microsphere; Preferably, the particle size of the light diffusing agent is less than or equal to 2.5 micrometers, and more preferably 1.0 micrometer to 2.5 micrometers.

6. The alloy material according to any one of claims 1-5, characterized in that, The alloy material has a melt flow index greater than 30 g / 10 min at 230℃ and 2.16 kg; and an impact strength of a simply supported beam at room temperature greater than or equal to 10 kJ / m. 2 Flexural modulus greater than 800 MPa, preferably greater than or equal to 900 MPa; haze greater than 95°, preferably greater than or equal to 98°; light transmittance greater than 85%.

7. A method for preparing a polypropylene alloy material according to any one of claims 1-6, characterized in that, The process includes the following steps: mixing polypropylene, polybutene-1 elastomer and light diffusing agent, melt extruding and granulating to obtain alloy material.

8. The preparation method according to claim 7, characterized in that, The mixing conditions include: mixing with a high-speed mixer for 1 to 5 minutes; and / or The twin-screw extruder used for the melt extrusion preferably has the following operating conditions: conveying section 100℃~180℃, homogenization section 180℃~250℃, extrusion temperature 190℃~220℃, die temperature 180℃~230℃, and screw speed 100 rpm~400 rpm.

9. The use of the polypropylene alloy material according to any one of claims 1-6 or the polypropylene alloy material prepared by the preparation method according to claim 7 or 8 for the preparation of automotive trim parts, preferably, the automotive trim parts include ambient lighting interior panels and bumper covers.

10. A car trim component, characterized in that, The component comprises a polypropylene alloy material according to any one of claims 1-6 or a polypropylene alloy material prepared by the preparation method according to claim 7 or 8; preferably, the automotive trim includes an ambient lighting interior panel and a bumper cover.

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