Polypropylene composite and method for producing the same

Abstract

The application discloses a kind of polypropylene composite material and preparation method thereof, which is prepared from polypropylene 57.5-81.5 parts, toughening agent 0-10 parts, talcum powder 15-25 parts, Y2W3O12 0.2-0.6 parts, antioxidant 0.2-0.6 parts, light stabilizer 0.2-0.6 parts and dispersing agent 0.1-0.3 parts according to weight parts.In polypropylene system, the material Y2W3O12 with negative linear expansion coefficient is added, so that the high-temperature rigidity of polypropylene composite material, especially the bending strength and bending modulus at 80℃ and 100℃ are significantly improved, and the application of polypropylene composite material in high-temperature environment is expanded.

Description

Technical Field

[0001] This invention belongs to the field of polymer material modification technology, specifically relating to a high-temperature, high-modulus polypropylene composite material and its preparation method. Background Technology

[0002] Polypropylene (PP) is widely used in automotive interior and exterior parts due to its excellent comprehensive properties. However, as automotive functions become more diverse, many OEMs are adding high-temperature mechanical performance requirements on top of existing requirements, such as tensile and flexural properties at 80°C and 100°C. Traditional modified PP often struggles to meet these high-temperature mechanical performance requirements, or requires formulations using highly crystalline copolymers and POE with good toughening effects, resulting in higher costs and pushing various properties to their limits. Summary of the Invention

[0003] In view of this, it is necessary for the present invention to provide a polypropylene composite material. The inventors have made a surprising discovery that adding a small amount of negative thermal expansion material Y2W3O12 to the traditional polypropylene system can increase the high-temperature mechanical properties of the polypropylene composite material, especially the flexural strength and flexural modulus properties at 80°C and 100°C.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a polypropylene composite material, which is prepared by weight of 57.5-81.5 parts of polypropylene, 0-10 parts of toughening agent, 15-25 parts of talc, 0.2-0.6 parts of Y2W3O12, 0.2-0.6 parts of antioxidant, 0.2-0.6 parts of light stabilizer and 0.1-0.3 parts of dispersant.

[0006] Y2W3O12 is a material with a negative linear thermal expansion coefficient, exhibiting a negative linear expansion coefficient within the temperature range of 50-700℃. The inventors were surprised to discover that adding a small amount of Y2W3O12 to a traditional polypropylene system significantly improves the high-temperature rigidity of polypropylene composites, particularly the flexural strength and flexural modulus at 80℃ and 100℃. Specifically, when a small amount of Y2W3O12 is distributed within the polypropylene system, the cell volume of Y2W3O12 decreases when the ambient temperature rises to 80℃. Silver crazing regions appear at the junction of Y2W3O12 and the polypropylene matrix. Under stress, these crazing regions absorb and disperse the stress, thereby improving the high-temperature mechanical properties of the polypropylene composite.

[0007] In a further embodiment, the polypropylene used as the matrix resin in this invention is not particularly limited in type. In one or more embodiments of this invention, the polypropylene is selected from at least one of homopolymer polypropylene and copolymer polypropylene, and the polypropylene has a melt index of 3-120 g / 10 min at 230°C and 2.16 kg.

[0008] In a further embodiment, the toughening agent described in this invention is selected from POE, and the melt index of the POE is 0.1-10 g / 10 min under the conditions of 190°C and 2.16 kg. It is understood that other similar toughening agents that can produce toughening effects can also be used in this application.

[0009] In a further embodiment, the talc powder has a particle size of 1200-8000 mesh.

[0010] In a further embodiment, the Y2W3O12 is a powder material with a particle size of 10-50 μm.

[0011] In a further embodiment, the antioxidants used in this invention can be conventional choices in the art, and specific examples include, but are not limited to, at least one of hindered amine antioxidants, hindered phenolic antioxidants, and phosphite antioxidants.

[0012] In a further embodiment, the light stabilizer used in this invention can be a conventional choice in the art. Specific embodiments that may be mentioned include, but are not limited to, hindered amine light stabilizers, benzotriazole light stabilizers, or benzophenone light stabilizers.

[0013] In a further embodiment, the dispersant is selected from silicone dispersants.

[0014] This invention further provides a method for preparing a polypropylene composite material, comprising the following steps:

[0015] 57.5-81.5 parts of polypropylene, 0-10 parts of toughening agent, 15-25 parts of talc, 0.2-0.6 parts of Y2W3O12, 0.2-0.6 parts of antioxidant, 0.2-0.6 parts of light stabilizer, and 0.1-0.3 parts of dispersant are thoroughly mixed according to their weight proportions to obtain a mixture. It is understood that the mixing process can be carried out using conventional methods in the field, as long as the purpose of uniform mixing can be achieved, so it will not be described in detail.

[0016] The mixture is melted, extruded, and granulated to obtain a polypropylene composite material.

[0017] In a further embodiment, the mixture is processed using a twin-screw extruder conventionally used in the art. The specific temperature and speed can be adjusted according to the different selections of the matrix resin and additives. In one or more embodiments of the present invention, the extrusion temperature of the twin-screw extruder is 190-230°C and the screw speed is 250-400 r / min.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The polypropylene composite material of this invention exhibits excellent mechanical properties, particularly superior flexural strength and flexural modulus at high temperatures (80℃ and 100℃). Compared to the polypropylene composite material without Y2W3O12, the polypropylene composite material in this invention shows an increase in flexural strength of 42.5%-145% and an increase in flexural modulus of 37.1%-53.9% at 80℃; and an increase in flexural strength of 43.1%-58.8% and an increase in flexural modulus of 30.3%-96.9% at 100℃. The polypropylene composite material in this invention also exhibits excellent high-temperature rigidity. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0023] The copolymer polypropylene with a melt flow index of 30 g / 10 min was purchased from PP EA5074 Basel.

[0024] The copolymer polypropylene with a melt flow index of 26 g / 10 min was purchased from Yanshan Petrochemical (PP K9026).

[0025] The homopolymer polypropylene with a melt flow index of 40 g / 10 min was purchased from Shanghai SECCO (PP S2040).

[0026] It is understood that the specific types of matrix resins and additives used in the following embodiments are merely examples to make the technical solution of the present invention clearer, and do not represent that only these types of matrix resins and additives can be used. Other matrix resins and additives that can achieve the technical solution of the present invention can also be used in the present invention. In addition, unless otherwise specified, "parts" and "number of parts" mentioned herein refer to parts by weight.

[0027] Example 1

[0028] Weigh out 70 parts of copolymer polypropylene PP EA5074 with a melt index of 30 g / 10 min, 20 parts of talc powder with a mesh size of 1250 mesh, 5 parts of POE with a melt index of 1 g / 10 min, 4 parts of Y2W3O12, 0.2 parts of hindered amine antioxidant Chimassorb944, 0.2 parts of hindered phenolic antioxidant 1010, 0.4 parts of light stabilizer UV 3808PP5, and 0.2 parts of silicone dispersant E525, and premix them in a high-speed mixer to obtain a uniformly mixed mixture.

[0029] The mixture is placed in a twin-screw extruder, where the temperatures from the feeding section to the die head are sequentially 180℃, 180℃, 185℃, 185℃, 190℃, 190℃, 200℃, 200℃, 200℃, and 195℃, and the screw speed is 300 rpm. The mixture is then melt-extruded, granulated, and dried to obtain a polypropylene composite material.

[0030] Comparative Example 1

[0031] This comparative example uses the same implementation method as Example 1, except that: 4 parts of Y2W3O12 were not added; other components and preparation methods are the same as in Example 1.

[0032] Example 2

[0033] Weigh out 63.8 parts of copolymer polypropylene PP K9026 with a melt index of 26 g / 10 min, 23 parts of talc powder with a mesh size of 2500 mesh, 8 parts of POE with a melt index of 3 g / 10 min, 4 parts of Y2W3O12, 0.2 parts of hindered amine antioxidant UV-3346, 0.3 parts of hindered phenolic antioxidant 1330, 0.5 parts of light stabilizer UV531, and 0.2 parts of silicone dispersant E525, and premix them in a high-speed mixer to obtain a uniformly mixed mixture.

[0034] The mixture is placed in a twin-screw extruder, where the temperatures from the feeding section to the die head are sequentially 170℃, 180℃, 180℃, 180℃, 190℃, 200℃, 200℃, 195℃, 195℃, and 190℃, and the screw speed is 300 rpm. The mixture is then melt-extruded, granulated, and dried to obtain a polypropylene composite material.

[0035] Comparative Example 2

[0036] This comparative example uses the same implementation method as Example 2, except that: the "63.8 parts of copolymer polypropylene PP K9026 with a melt index of 26 g / 10 min and 4 parts of Y2W3O12" in Example 2 are replaced with "67.8 parts of copolymer polypropylene PP K9026 with a melt index of 26 g / 10 min"; other components and preparation methods are the same as in Example 2.

[0037] Example 3

[0038] Weigh out 73.2 parts of copolymer polypropylene PP YPJ1215C with a melt index of 15 g / 10 min, 18 parts of talc powder with a mesh size of 1250 mesh, 3 parts of POE with a melt index of 6 g / 10 min, 5 parts of Y2W3O12, 0.3 parts of hindered amine antioxidant Chimassorb944, 0.3 parts of light stabilizer UV214, and 0.2 parts of silicone dispersant E525, and premix them in a high-speed mixer to obtain a uniformly mixed mixture.

[0039] The mixture is placed in a twin-screw extruder, where the temperatures from the feeding section to the die head are sequentially 180℃, 180℃, 180℃, 185℃, 190℃, 195℃, 195℃, 200℃, 210℃, and 210℃, and the screw speed is 300 rpm. The mixture is then melt-extruded, granulated, and dried to obtain a polypropylene composite material.

[0040] Example 4

[0041] Weigh out 81.5 parts of homopolymer polypropylene PP S2040 with a melt index of 40 g / 10 min, 15 parts of talc powder with a mesh size of 600 mesh, 3 parts of Y2W3O12, 0.05 parts of hindered amine antioxidant Uvinul4050H, 0.15 parts of hindered phenolic antioxidant 1010, 0.2 parts of light stabilizer UV3808PP5, and 0.1 parts of silicone dispersant E525, and premix them in a high-speed mixer to obtain a uniformly mixed mixture.

[0042] The mixture is placed in a twin-screw extruder, where the temperatures from the feeding section to the die head are sequentially 170℃, 180℃, 180℃, 180℃, 185℃, 190℃, 190℃, 195℃, 195℃, and 190℃, and the screw speed is 280 rpm. The mixture is then melt-extruded, granulated, and dried to obtain a polypropylene composite material.

[0043] Example 5

[0044] Weigh out 57.5 parts of copolymer polypropylene PP EA5074 with a melt index of 30 g / 10 min, 25 parts of talc powder with a mesh size of 8000 mesh, 10 parts of POE with a melt index of 1 g / 10 min, 6 parts of Y2W3O12, 0.3 parts of hindered amine antioxidant Chimassorb944, 0.3 parts of hindered phenolic antioxidant 1010, 0.6 parts of light stabilizer UV 3808PP5, and 0.3 parts of silicone dispersant E525, and premix them in a high-speed mixer to obtain a uniformly mixed mixture.

[0045] The mixture is placed in a twin-screw extruder, where the temperatures from the feeding section to the die head are sequentially 180℃, 180℃, 185℃, 190℃, 200℃, 200℃, 210℃, 220℃, 230℃, and 230℃, and the screw speed is 300 rpm. The mixture is then melt-extruded, granulated, and dried to obtain a polypropylene composite material.

[0046] Comparative Example 3

[0047] This comparative example uses the same implementation method as Example 5, except that: the "57.5 parts of copolymer polypropylene PP EA5074 with a melt index of 30 g / 10 min and 6 parts of Y2W3O12" in Example 5 are replaced with "63.5 parts of copolymer polypropylene PP EA5074 with a melt index of 30 g / 10 min"; other components and preparation methods are the same as in Example 5.

[0048] Test case

[0049] The polypropylene composite materials obtained in Examples 1-5 and Comparative Examples 1-3 were subjected to performance testing according to the following methods. The test results are shown in Table 1:

[0050] Among them, bending strength and bending modulus were tested according to ISO 178 standard, with test specimen size of 80×10×4mm and bending speed of 2mm / min;

[0051] The notched impact strength of simply supported beams was tested according to ISO 180 standard at a test temperature of 23℃ and the test specimen size was 80×10×4mm.

[0052] Table 1. Performance test results of polypropylene composite materials

[0053]

[0054] As can be seen from the test results in Table 1, compared with the comparative example, the polypropylene composite material prepared in the embodiments of the present invention has better high-temperature mechanical properties, especially the flexural strength and flexural modulus at 80℃ and 100℃.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A polypropylene composite, characterized in that, It is prepared by weight of 57.5-81.5 parts polypropylene, 0-10 parts toughening agent, 15-25 parts talc, 3, 4, 5 or 6 parts Y2W3O12, 0.2-0.6 parts antioxidant, 0.2-0.6 parts light stabilizer and 0.1-0.3 parts dispersant; wherein Y2W3O12 is a powder material with a particle size of 10-50μm.

2. The polypropylene composite of claim 1, wherein, The polypropylene is selected from at least one of homopolymer polypropylene and copolymer polypropylene, and the polypropylene has a melt index of 3-120 g / 10 min at 230°C and 2.16 kg.

3. The polypropylene composite of claim 1, wherein the polypropylene is a homopolymer of propylene. The toughening agent is selected from POE, and the melt index of POE is 0.1-10g / 10min at 190℃ and 2.16kg.

4. The polypropylene composite of claim 1, wherein, The talc powder has a particle size of 1200-8000 mesh.

5. The polypropylene composite of claim 1, wherein the polypropylene is a homopolymer of propylene. The antioxidant is selected from at least one of hindered amine antioxidants, hindered phenolic antioxidants, and phosphite antioxidants.

6. The polypropylene composite of claim 1, wherein, The light stabilizer is selected from hindered amine light stabilizers, benzotriazole light stabilizers, or benzophenone light stabilizers.

7. The polypropylene composite of claim 1, wherein the polypropylene is a homopolymer of propylene. The dispersant is selected from silicone dispersants.

8. A process for the production of a polypropylene composite material as claimed in any one of claims 1 to 7, characterized in that Includes the following steps: Polypropylene, toughening agent, talc, Y2W3O12, antioxidant, light stabilizer and dispersant are thoroughly mixed according to the weight parts to obtain a mixture; The mixture is melted, extruded, and granulated to obtain a polypropylene composite material.

9. The production method according to claim 8, wherein The mixture is processed using a twin-screw extruder with an extrusion temperature of 190-230℃ and a screw speed of 250-400 r / min.

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