High-impact polypropylene composite material for energy storage electrode frame and preparation method of high-impact polypropylene composite material

Abstract

The invention discloses a high-impact polypropylene composite material for an energy storage electrode frame. The high-impact polypropylene composite material is prepared from the following components in parts by weight: 78-83 parts of co-polypropylene, 10-20 parts of a toughening agent, 0.2-1 part of nucleating master batch, 0.1-0.5 part of an antioxidant and 0.1-0.5 part of a lubricant, wherein the nucleating master batch comprises a carboxylate compound and a sorbitol acetal compound in a mass ratio of 1: (1-4). The method can be applied to industrial batch production of the composite material for the energy storage electrode frame with low density and low shrinkage.

Description

Technical Field

[0001] This invention relates to the field of polymer composite materials technology, specifically a high-impact polypropylene composite material for energy storage electrode frames and its preparation method. Background Technology

[0002] Energy storage, utilization, and consumption are crucial social issues, and the development of green energy reserves is continuously progressing. The widespread use of energy storage cabinets has greatly helped to promote more convenient energy use and improve people's lives. Regarding the materials used in energy storage cabinets, polypropylene, due to its advantages such as light weight, high cost-effectiveness, ease of processing, oil resistance, and acid and alkali resistance, has seen further promotion and application in energy storage.

[0003] Polypropylene (PP) materials are widely used due to their low density, excellent acid and alkali resistance, fatigue resistance, and low price. However, the high crystallinity and poor dimensional stability of PP increase the difficulty of its application. To address these issues and expand the application of PP materials in this field, actively developing low-density, low-shrinkage, and dimensionally stable PP composite materials has become one of the current research directions. Summary of the Invention

[0004] In view of this, the present invention provides a high-impact polypropylene composite material for energy storage electrode frames and a method for preparing the same, which can be applied to the industrial mass production of composite materials for low-density, low-shrinkage energy storage electrode frames.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] On one hand, the present invention discloses a high-impact polypropylene composite material for energy storage electrode frames, which is prepared from the following components in parts by weight: 78-83 parts of copolymer polypropylene, 10-20 parts of toughening agent, 0.2-1 parts of nucleating masterbatch, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant; wherein the nucleating masterbatch contains carboxylate compounds and sorbitol acetal compounds in a mass ratio of 1:(1-4).

[0007] As a further aspect of the present invention: the melt index of the copolymer polypropylene is less than 20 g / 10 min at 230℃ / 2.16 kg, the tensile strength is greater than 18 MPa at a tensile speed of 50 mm / min, and the notched impact strength of the cantilever beam is greater than 40 KJ / m2.

[0008] As a further aspect of the present invention: the toughening agent is at least one of ethylene propylene diene monomer (EPDM), ethylene octene copolymer, and butadiene rubber.

[0009] As a further aspect of the present invention: the antioxidant is at least one of antioxidant 1010, antioxidant DSTDP, and antioxidant 168.

[0010] As a further aspect of the present invention, the lubricant is at least one of ethylene bis-stearamide, silicone, zinc stearate, lead stearate, barium stearate, calcium stearate, and pentaerythritol stearate.

[0011] As a further aspect of the present invention, the method for preparing the nucleating masterbatch is as follows:

[0012] The carboxylate compound, sorbitol acetal compound, and silicone additive (preferably E525 or P121) in a mass ratio of 1:(1-4):(1-5) are hot-mixed in a high-speed mixer for 240 seconds at 40-70°C.

[0013] On the other hand, the present invention discloses a method for preparing the above-mentioned high-impact polypropylene composite material for energy storage electrode frames, comprising the following steps:

[0014] Copolymer polypropylene, toughening agent, nucleating masterbatch, antioxidant and lubricant are added together in a high-speed mixer and mixed evenly to obtain a mixture;

[0015] The mixture is added to an extruder for melt extrusion and then granulated to obtain a high-impact polypropylene composite material for energy storage electrode frames.

[0016] A further embodiment: the temperatures of the extruder from the feed port to the die are 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃, respectively; the speed of the extruder is 180~300rpm; and the vacuum degree is -0.07~-0.03MPa.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention uses high-impact block copolymer polypropylene with medium to low melt index as the base material, aiming to produce high-impact polypropylene with a large molecular weight distribution and large molecular chains. This type of polypropylene material has strong intermolecular forces, high strength and high toughness.

[0019] 2. This invention utilizes toughening agents to further improve the distribution of the rubber phase in polypropylene composite materials, thereby enhancing the material's impact resistance and dimensional stability.

[0020] 3. This invention utilizes nucleating masterbatch, which is then hot-mixed before being blended with the base material. This aims to enhance the dispersion of the nucleating masterbatch, improve the uniformity of the distribution of each component in the plastic material, and achieve optimal nucleation. Carboxylates reduce the shrinkage rate and linear expansion coefficient of the composite material, particularly benefiting post-shrinkage. Sorbitol acetals, on the other hand, can change the crystal form to the β-type, making the product more transparent. The combination of these two in polypropylene composites significantly improves transparency and ensures β-crystal stability, thereby guaranteeing the impact strength and dimensional stability of the polypropylene material. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0024] The copolymer polypropylenes are PP-EP200R (Basel), PP-K9017 (Formosa Chemicals & Fibre), PP-SP179 (Qilu Petrochemical), and PP-BA212E (Borouge Chemicals).

[0025] The toughening agents used are POE8200, POE8842, EPDM, and BR;

[0026] The nucleating masterbatch used is a mixture of carboxylates and sorbitol acetals, prepared according to the following steps:

[0027] The desired product is obtained by adding one part of silicone additive (E525) to carboxylate compounds and sorbitol acetal compounds in the required proportions and then hot mixing them in a high-speed mixer for 240 seconds.

[0028] The antioxidants used are 1010, antioxidant 168, and antioxidant DSTDP;

[0029] The lubricants used are ethylene bis-stearamide (EBS / P-130), calcium stearate, zinc stearate, lead stearate, barium stearate, and pentaerythritol stearate.

[0030] All materials are commercially available, commonly used products.

[0031] It is understood that the above-mentioned raw materials and reagents are merely examples of some specific embodiments of the present invention, making the technical solution of the present invention clearer, and do not mean that the present invention can only use the above-mentioned reagents. The specific scope shall be determined by the claims. In addition, unless otherwise specified, "parts" in the examples and comparative examples refer to parts by weight.

[0032] Any range described in this invention includes the endpoint, any value between the endpoints, and any subrange consisting of the endpoint or any value between the endpoints.

[0033] Example 1

[0034] Weigh out 78 parts of dried copolymer polypropylene PP-EP200R, 20 parts of toughening agent POE 8200, 0.2 parts of nucleating masterbatch (carboxylate: sorbitol acetal: silicone = 1:1:2), 0.1 parts of antioxidant 1010, 0.1 parts of antioxidant DSTDP, and 0.5 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively; the main extruder speed is 180 rpm; and the vacuum degree is -0.03 MPa.

[0035] Example 2

[0036] Weigh out 80 parts of dried copolymer polypropylene PP-SP179, 10 parts of toughening agent POE 8842, 0.4 parts of nucleating masterbatch (carboxylate: sorbitol acetal: silicone = 1:4:5), 0.1 parts of antioxidant, 0.2 parts of antioxidant DSTDP, 0.2 parts of antioxidant 168, and 0.2 parts of lubricant calcium stearate. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively; the main motor speed is 200 rpm; and the vacuum degree is -0.07 MPa.

[0037] Example 3

[0038] Weigh out 23 parts of dried copolymer polypropylene PP-BA212E, 60 parts of dried copolymer polypropylene PP-K9017, 15 parts of toughening agent EPDM, 1 part of nucleating masterbatch (carboxylate: sorbitol acetal: silicone = 1:3:4), 0.1 parts of antioxidant 1010, 0.2 parts of antioxidant 168, and 0.4 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively. The main engine speed is 300 rpm, and the vacuum degree is -0.05 MPa.

[0039] Example 4

[0040] Weigh out 43 parts of dried copolymer polypropylene PP-BA212E and 40 parts of dried copolymer polypropylene PP-EP200R, 15 parts of toughening agent POE8200, 1 part of nucleating masterbatch (carboxylate: sorbitol acetal: silicone = 1:2:3), 0.1 parts of antioxidant 1010, 0.1 parts of antioxidant DSTDP, 0.2 parts of antioxidant 168, and 0.3 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively. The main engine speed is 200 rpm, and the vacuum degree is -0.06 MPa.

[0041] Comparative Example 1

[0042] Weigh out 43 parts of dried copolymer polypropylene PP-BA212E and 55 parts of dried copolymer polypropylene PP-EP200R, 0.1 parts of antioxidant 1010, 0.1 parts of antioxidant DSTDP, 0.2 parts of antioxidant 168, and 0.3 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively. The main extruder speed is 200 rpm, and the vacuum degree is -0.06 MPa.

[0043] Comparative Example 2

[0044] Weigh out 58 parts of dried copolymer polypropylene PP-BA212E and 40 parts of dried copolymer polypropylene PP-EP200R, 1 part of nucleating masterbatch (carboxylate: sorbitol acetal: silicone = 1:2:3), 0.1 parts of antioxidant 1010, 0.1 parts of antioxidant DSTDP, 0.2 parts of antioxidant 168, and 0.3 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively. The main extruder speed is 200 rpm, and the vacuum degree is -0.06 MPa.

[0045] Comparative Example 3

[0046] Weigh out 43 parts of dried copolymer polypropylene PP-BA212E, 40 parts of dried copolymer polypropylene PP-EP200R, 15 parts of toughening agent POE8200, 0.1 parts of antioxidant 1010, 0.1 parts of antioxidant DSTDP, 0.2 parts of antioxidant 168, and 0.3 parts of lubricant EBS. Add the above materials to a high-speed mixer and mix evenly. Then, add the evenly mixed mixture to an extruder, cool it with water, and then pelletize it. The processing temperature of the extruder from the feed port to the die port is 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃ respectively. The main extruder speed is 200 rpm, and the vacuum degree is -0.06 MPa.

[0047] The composite materials prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests according to the following standards:

[0048] 1. A 356*100*3.2mm combustion speed plate was injection molded. An 80mm*10mm strip was cut and subjected to flexural strength testing according to the flexural strength test standard GB / 9341-2008; a notched beam impact test was performed according to the notched impact strength test standard GB / T 1043.1-2008; and the combustion speed plate was tested for dimensions 24 hours and 48 hours after injection molding according to GB / T17037.4-2003. 2. A 0.8mm thick flat plate was injection molded, and its light transmittance was tested according to the light transmittance test standard GB / T 2410-2008.

[0049] The test results are shown in Table 1.

[0050] Table 1

[0051]

[0052] Note: As can be seen from the table above, the melt index, strength, and notched impact strength of the polypropylene composite materials prepared in Examples 1-4 of this invention vary to varying degrees, but are all superior to the comparative examples. Furthermore, the composite materials prepared in Examples 1-4 exhibit low shrinkage after baking at 90°C for 2 hours, and the product dimensions are stable. Therefore, the polypropylene composite materials prepared by this invention can meet the different performance requirements of customers and be applied to lightweight products.

[0053] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0054] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A high-impact polypropylene composite material for energy storage electrode frames, characterized in that, It is prepared from the following components in parts by weight: 78-83 parts of copolymer polypropylene, 10-20 parts of toughening agent, 0.2-1 parts of nucleating masterbatch, 0.1-0.5 parts of antioxidant, and 0.1-0.5 parts of lubricant; wherein the nucleating masterbatch contains carboxylate compounds and sorbitol acetal compounds in a mass ratio of 1:(1-4).

2. The high-impact polypropylene composite material for energy storage electrode frames according to claim 1, characterized in that, The melt index of the copolymer polypropylene is less than 20 g / 10 min at 230℃ / 2.16 kg, and its tensile strength is greater than 18 MPa and its notched cantilever beam impact strength is greater than 40 KJ / m at a tensile speed of 50 mm / min. 2 .

3. The high-impact polypropylene composite material for energy storage electrode frames according to claim 1, characterized in that, The toughening agent is at least one of ethylene propylene diene monomer (EPDM), ethylene octene copolymer, and butadiene rubber.

4. The high-impact polypropylene composite material for energy storage electrode frames according to claim 1, characterized in that, The antioxidant is at least one of antioxidant 1010, antioxidant DSTDP, and antioxidant 168.

5. The high-impact polypropylene composite material for energy storage electrode frames according to claim 1, characterized in that, The lubricant is at least one of ethylene bis-stearamide, silicone, zinc stearate, lead stearate, barium stearate, calcium stearate, and pentaerythritol stearate.

6. The high-impact polypropylene composite material for energy storage electrode frames according to claim 1, characterized in that, The method for preparing the nucleating masterbatch is as follows: The product is obtained by blending carboxylate compounds, sorbitol acetal compounds, and silicone additives at a mass ratio of 1:(1-4):(1-5) and at 40-70°C.

7. The method for preparing high-impact polypropylene composite material for energy storage electrode frames as described in claims 1-6, characterized in that, Includes the following steps: Copolymer polypropylene, toughening agent, nucleating masterbatch, antioxidant and lubricant are added together in a high-speed mixer and mixed evenly to obtain a mixture; The mixture is added to an extruder for melt extrusion and then granulated to obtain a high-impact polypropylene composite material for energy storage electrode frames.

8. The preparation method according to claim 7, characterized in that, The temperatures of the extruder from the feed port to the die are 180℃, 190℃, 195℃, 195℃, 200℃, and 205℃, respectively. The speed of the extruder is 180~300rpm, and the vacuum degree is -0.07~-0.03MPa.

Images