A scratch-resistant agent, a scratch-resistant polypropylene material, and a method for producing the same

Abstract

This invention discloses a scratch-resistant polypropylene material and its preparation method. The scratch-resistant polypropylene material is prepared by weight proportions of 39.2-74.6 parts polypropylene, 5-30 parts inorganic filler, 5-10 parts long-chain branched polypropylene (LCB-PP), 15-20 parts scratch-resistant agent, 0.2-0.4 parts antioxidant, and 0.2-0.4 parts processing aid. By adding a certain proportion of LCB-PP to the formulation, this invention can improve the scratch resistance of modified polypropylene, resulting in better scratch resistance with the same amount of scratch-resistant agent. This allows for a reduction in the proportion of scratch-resistant agent, improving the odor properties of the scratch-resistant polypropylene. This product has a competitive advantage in automotive interior parts.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials, specifically relating to scratch-resistant polypropylene materials and their preparation methods. Background Technology

[0002] Polypropylene is one of the most common general-purpose plastics, with advantages such as low density, good mechanical properties, recyclability, and high cost-effectiveness, making it widely used in automotive and home appliance parts. However, polypropylene has a lower surface hardness than other materials and poorer scratch resistance. When used on appliance casings and automotive interior parts, it often causes scratches and damage to the appearance of the products during use, affecting their aesthetics.

[0003] When a material is subjected to scratch resistance, its surface is damaged because the polypropylene yields and deforms at the contact point with the scratching material. During the scratching process, the movement of this deformation point damages the polypropylene material along its trajectory, causing delamination between the polypropylene and the matrix filler, thus revealing the scratched surface. Common methods to improve the scratch resistance of polypropylene typically involve adding erucamide-based or silicone-based scratch-resistant agents. However, both of these agents are small molecules that are prone to leaching out during later use when exposed to heat or light, resulting in poor product appearance. Furthermore, both types of substances have a strong odor; adding them in large proportions to the modified formulation can affect the material's smell, thus hindering its application in automotive interior parts. Summary of the Invention

[0004] In view of this, the present invention needs to provide a scratch-resistant polypropylene material and its preparation method, by adding a portion of LCB-PP to the polypropylene formulation system, thereby enabling the polypropylene material to obtain good scratch resistance.

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

[0006] A scratch-resistant polypropylene material is prepared from 39.2-74.6 parts polypropylene, 5-30 parts inorganic filler, 5-10 parts long-chain branched polypropylene (LCB-PP), 15-20 parts scratch-resistant agent, 0.2-0.4 parts antioxidant, and 0.2-0.4 parts processing aid in parts by weight.

[0007] In a further embodiment, the polypropylene is at least one of copolymer polypropylene and homopolymer polypropylene;

[0008] In a further embodiment, the inorganic filler is one or more of talc, calcium carbonate, barium sulfate, and basic magnesium sulfate whiskers;

[0009] In a further embodiment, the scratch-resistant agent is a silicone-based scratch-resistant agent;

[0010] In a further embodiment, the antioxidant is one or more of hindered amine antioxidants, hindered phenolic antioxidants, and phosphite antioxidants;

[0011] In a further embodiment, the processing aid is one of calcium stearate and EBS;

[0012] The present invention also provides a method for preparing the scratch-resistant polypropylene material described above, comprising the following steps:

[0013] Polypropylene, inorganic filler, LCB-PP, silicone scratch-resistant agent, antioxidant, and processing aid are thoroughly mixed according to the weight ratio to obtain a homogeneous mixture.

[0014] A homogeneous mixture is added to a twin-screw extruder for melt extrusion granulation to obtain a scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are as follows: Zone 1: 180-190℃; Zone 2: 185-195℃; Zone 3: 190-210℃; Zone 4: 190-230℃; Zone 5: 200-230℃.

[0015] The present invention has the following beneficial effects:

[0016] This invention incorporates a specific proportion of LCB-PP into the formulation. During the polymerization process, long chains are introduced into the molecular chain of this PP to form a branched structure. This long branched structure forms an entanglement within the polypropylene, resisting damage from external forces during scratching and reducing the degree of peeling and tearing, thereby improving the material's scratch resistance. LCB-PP itself is a matrix resin and does not exudate. The scratch-resistant polypropylene material of this invention has a low content of scratch-resistant agent, resulting in a resin with better odor and exudation resistance. This product has a competitive advantage in automotive interior parts. Detailed Implementation

[0017] 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.

[0018] 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 this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. All materials used in this invention are commercially available products.

[0019] Example 1

[0020] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0021] The scratch-resistant polypropylene material, as described in the weight parts, is made by dry mixing 53.4 parts of polypropylene PP 7227H (Wuhan Ethylene), 20 parts of talc, 8 parts of LCB-PP WB130HMS (Borealis), 18 parts of silicone scratch-resistant agent LYSI-06 (Chengdu Silike), 0.1 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 185℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 220℃ in zone 5.

[0022] Example 2

[0023] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0024] The scratch-resistant polypropylene material, as described in parts by weight, is made by dry mixing 65.2 parts of polypropylene PP T30S (Sinopec), 10 parts of calcium carbonate, 7 parts of LCB-PP WB140HMS (Borealis), 17 parts of silicone scratch-resistant agent AS-100 (Evonik Degussa), 0.2 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.4 parts of processing aid EBS in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 180℃ in zone 1, 190℃ in zone 2, 195℃ in zone 3, 200℃ in zone 4, and 210℃ in zone 5.

[0025] Example 3

[0026] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0027] The scratch-resistant polypropylene material, as described in parts by weight, is made by mixing 61.4 parts of polypropylene PP BX3800 (SK Chemicals, Korea), 15 parts of barium sulfate, 6 parts of LCB-PP MFX (JPP Corporation, Japan), 17 parts of silicone scratch-resistant agent HMB0221 (Dow Corning), 0.1 parts of hindered phenolic antioxidant 1010, 0.1 parts of phosphite antioxidant 168, 0.1 parts of hindered amine antioxidant UV944, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 190℃ in zone 1, 195℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 230℃ in zone 5.

[0028] Example 4

[0029] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0030] The scratch-resistant polypropylene material, as described in parts by weight, is made by dry mixing 84.6 parts of polypropylene PP BX3800 (SK Chemicals, Korea), 5 parts of basic magnesium sulfate, 5 parts of LCB-PP WB140 (Borealis), 5 parts of silicone scratch-resistant agent HMB0221 (Dow Corning), 0.2 parts of phosphite antioxidant 168, and 0.2 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 180℃ in zone 1, 185℃ in zone 2, 190℃ in zone 3, 190℃ in zone 4, and 200℃ in zone 5.

[0031] Example 5

[0032] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0033] The scratch-resistant polypropylene material, as described in the weight parts, is made by dry mixing 39.2 parts of polypropylene PP T30S (Sinopec), 30 parts of talc, 10 parts of LCB-PP WB140 (Borealis), 20 parts of silicone scratch-resistant agent AS-100 (Evonik Degussa), 0.2 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.4 parts of processing aid EBS in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 190℃ in zone 1, 185-195℃ in zone 2, 210℃ in zone 3, 230℃ in zone 4, and 230℃ in zone 5.

[0034] Comparative Example 1:

[0035] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0036] The scratch-resistant polypropylene material, as described in the weight parts, is made by dry mixing 61.4 parts of polypropylene PP 7227H (Wuhan Ethylene), 20 parts of talc, 18 parts of silicone scratch-resistant agent LYSI-06 (Chengdu Silike), 0.1 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 185℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 220℃ in zone 5.

[0037] Comparative Example 2:

[0038] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0039] The scratch-resistant polypropylene material, as described in the weight parts, is made by dry mixing 53.4 parts of polypropylene PP 7227H (Wuhan Ethylene), 20 parts of talc, 8 parts of POE 8200 (Dow Chemical), 18 parts of silicone scratch-resistant agent LYSI-06 (Chengdu Silike), 0.1 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 185℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 220℃ in zone 5.

[0040] Comparative Example 3

[0041] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0042] The scratch-resistant polypropylene material, as described in the weight parts, is made by dry mixing 53.4 parts of polypropylene PP 7227H (Wuhan Ethylene), 20 parts of talc, 8 parts of HDPE 8008 (Sinopec), 18 parts of silicone scratch-resistant agent LYSI-06 (Chengdu Silike), 0.1 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 185℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 220℃ in zone 5.

[0043] Comparative Example 4:

[0044] A method for preparing a scratch-resistant polypropylene material includes the following steps:

[0045] The scratch-resistant polypropylene material, as described in parts by weight, is made by dry mixing 54.4 parts of polypropylene PP 7227H (Wuhan Ethylene), 20 parts of talc, 25 parts of silicone scratch-resistant agent LYSI-06 (Chengdu Silike), 0.1 parts of hindered phenolic antioxidant 1010, 0.2 parts of phosphite antioxidant 168, and 0.3 parts of processing aid calcium stearate in a high-speed mixer for 8 minutes. The uniform mixture is then melt-extruded and granulated in a twin-screw extruder to obtain the scratch-resistant polypropylene material. The temperatures of the twin-screw extruder are 185℃ in zone 1, 190℃ in zone 2, 200℃ in zone 3, 220℃ in zone 4, and 220℃ in zone 5.

[0046] Scratch resistance tests were conducted according to standard PV3952, with a load of 10N. The scratch resistance was evaluated by measuring the ΔL value (the change in black and white color) on the scratched sample surface; a smaller ΔL value indicates better scratch resistance. Odor was tested according to VDA270 standard, tensile strength according to ISO527, and notched impact strength of a simply supported beam according to ISO 179. Specific results are shown in Table 1 below.

[0047] Table 1. Scratch resistance of the products prepared in the examples and comparative examples.

[0048]

[0049] As can be seen from the results in Table 1, by adding a certain proportion of LCB-PP to the formulation, the present invention can improve the scratch resistance of modified polypropylene on the original basis. Under the same scratch-resistant agent addition, it has a better scratch resistance effect, thereby reducing the addition ratio of scratch-resistant agent and improving the odor performance of scratch-resistant polypropylene.

[0050] 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.

[0051] 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 scratch-resistant polypropylene material, characterized in that: The scratch-resistant polypropylene material is prepared by weight proportions of 39.2-74.6 parts polypropylene, 5-30 parts inorganic filler, 5-10 parts long-chain branched polypropylene, 15-20 parts scratch-resistant agent, 0.2-0.4 parts antioxidant, and 0.2-0.4 parts processing aid.

2. The scratch-resistant polypropylene material according to claim 1, characterized in that: The polypropylene is at least one of copolymer polypropylene and homopolymer polypropylene.

3. The scratch-resistant polypropylene material according to claim 1, characterized in that: The inorganic filler is one or more of talc, calcium carbonate, barium sulfate, and basic magnesium sulfate whiskers.

4. The scratch-resistant polypropylene material according to claim 1, characterized in that: The scratch-resistant agent is a silicone-based scratch-resistant agent.

5. The scratch-resistant polypropylene material according to claim 1, characterized in that: The antioxidant is one or more of hindered amine antioxidants, hindered phenolic antioxidants, and phosphite antioxidants.

6. The scratch-resistant polypropylene material according to claim 1, characterized in that: The processing aid is one of calcium stearate or EBS.

7. A method for preparing a scratch-resistant polypropylene material as described in any one of claims 1-6, characterized in that: Includes the following steps: Polypropylene, inorganic filler, LCB-PP, silicone scratch-resistant agent, antioxidant, and processing aid are thoroughly mixed according to the weight ratio to obtain a homogeneous mixture. A uniform mixture is added to a twin-screw extruder for melt extrusion granulation to obtain a scratch-resistant polypropylene material.

8. The method for preparing the scratch-resistant polypropylene material according to claim 7, characterized in that: The temperature of the twin-screw extruder is 180-190℃ in zone one, 185-195℃ in zone two, 190-210℃ in zone three, 190-230℃ in zone four, and 200-230℃ in zone five.

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