Polypropylene composite material as well as preparation method and application thereof

Abstract

The invention belongs to the field of polypropylene materials, and particularly discloses a polypropylene composite material and a preparation method and application thereof. According to the invention, the chelate is added into the polypropylene composite material and interacts with the polypropylene and the mineral filler, so that the mineral filler and the polypropylene have relatively good affinity, small-molecular precipitation substances in the polypropylene composite material can be captured, and the precipitation adhesion condition of the material is improved; the polypropylene composite material has the advantages of favorable impact toughness, higher electroplating property, higher plating layer peel strength and lower precipitation property, and meets the requirements of electroplated products on the aspects of mechanics and electroplating property.

Description

Technical Field

[0001] The present invention belongs to the field of polypropylene materials, and in particular relates to a polypropylene composite material and a preparation method and application thereof. Background Art

[0002] With the rapid development of industry, the application of plastic electroplating is becoming increasingly widespread, becoming a key method for surface decoration in plastic products. Compared with metal parts, electroplated plastic products not only achieve a superior metallic texture but also reduce product weight. While effectively improving the appearance and decorative properties of plastics, they also enhance their electrical, thermal, and corrosion resistance properties, and increase their surface mechanical strength. However, due to the unique characteristics of plastics, the selection of plastic materials for electroplating requires comprehensive consideration of factors such as the plastic's processing properties, the ease of electroplating, and dimensional stability and accuracy.

[0003] Among many plastics, ABS (Abstract Polystyrene Absorbent) (ABS) is highly electroplatable, making it the material of choice for current electroplated plastic products. However, due to its structural characteristics, it cannot simultaneously meet the required mechanical properties for practical applications, such as impact strength, tensile strength, and flexural modulus. Furthermore, the high cost of ABS has limited its application in electroplated plastic products. Polypropylene (PP), a semi-crystalline thermoplastic, is inexpensive and can be enhanced in strength and thermal stability by adding fillers. It can meet the flexural strength and heat resistance requirements of electroplated plastic products and is resistant to a variety of organic solvents and acid and alkali corrosion. However, its high crystallinity makes surface roughening difficult and results in poor coating adhesion, hindering its application in parts requiring electroplating. Furthermore, the addition of fillers can significantly reduce impact strength due to poor compatibility between the filler and the substrate. Furthermore, PP is prone to the precipitation of small molecules, which not only causes yellowing, dirtiness, and stickiness on the surface, resulting in a poor appearance, but also further reduces its plating suitability.

[0004] Therefore, due to the poor electroplatability of polypropylene and the poor mechanical properties of ABS, the current automotive headlight housing and reflector, which need to balance electroplating and mechanical properties, must be made of PP and ABS respectively, forming separate structural components of the automotive headlight housing and reflector. This requires a high degree of compatibility between the two types of products. For example, due to the weight and special location of the automotive headlight housing, the support structure and mounting holes must have high dimensional accuracy. However, due to the different shrinkage rates and plating properties of ABS and PP, the dimensional matching and assembly effects of PP and ABS materials are poor. If a highly platable PP can be developed, and the automotive headlight housing and reflector are made into an integrated product with the same material, the problem of poor compatibility between PP and ABS materials can be fundamentally solved, and the application scenarios of PP materials can be broadened.

[0005] Therefore, there is still a need to further develop PP materials with high plating properties, low precipitation and good impact strength. Summary of the Invention

[0006] In view of the defects of the polypropylene materials involved in the above-mentioned prior art, such as low plating ability, high precipitation and low impact strength, the present invention will provide a polypropylene composite material and its preparation method and application.

[0007] To achieve the above objectives, the following technical solutions are specifically included:

[0008] On the one hand, the present invention provides a polypropylene composite material, comprising the following components in parts by weight: 48-72 parts of polypropylene, 4.5-46 parts of mineral filler, 2.8-8.3 parts of chelate, and 0.4-2.2 parts of additive, wherein the mesh size of the mineral filler is 1000-4000 mesh; the chelate has an organic ligand and a metal ion, and the organic ligand comprises at least one of an organic ligand containing a diimine group, an organic ligand containing a phenol group, or an organic ligand containing an acid anhydride structure.

[0009] The composite material of the present invention has a chelate. On the one hand, the chelate of the specific organic ligand interacts with polypropylene and a mineral filler with a mesh size of 1000-4000 mesh, so that the mineral filler with a specific mesh size and polypropylene have good affinity, which not only improves the impact toughness of the material, but also migrates to the surface of the polypropylene composite material, so that the polypropylene material has a higher surface activity under the electroplating process, and improves the surface polarity of the polypropylene composite material, significantly improves the electroplatability of the polypropylene material, and improves the firmness of the electroplated coating; on the other hand, the chelate captures small molecule precipitated substances in the polypropylene composite material through electron transfer and covalent bonds, improves the situation of material precipitation and stickiness, solves the problem of yellowing and dirt on the surface of the material, and further improves the firmness of the material coating to a certain extent. Therefore, the polypropylene composite material of the present invention has good impact toughness, strong electroplatability, high coating peeling strength and low precipitation, meets the requirements of electroplated products in mechanics, electroplatability and appearance, and broadens the application scenarios of polypropylene composite materials.

[0010] Preferably, the polypropylene composite material comprises the following components in parts by weight: 50-70 parts of polypropylene, 5-45 parts of mineral filler, 3-8 parts of chelate, and 0.5-2 parts of additive.

[0011] Further preferably, the polypropylene composite material comprises the following components in parts by weight: 55-65 parts of polypropylene, 15-20 parts of filler, 5-8 parts of chelate, and 0.5-0.7 parts of additive.

[0012] Common polypropylene resins in the art can be used in the present invention, and the polypropylene resin includes but is not limited to at least one of homopolymer polypropylene, random copolymer polypropylene, and block copolymer polypropylene.

[0013] Preferably, the melt flow rate (MFR) of the polypropylene tested at 230°C and 2.16 kg load according to ISO 1133-2011 is 8-30 g / 10 min, specifically 8 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, etc., as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range. The polypropylene of the present invention may specifically include but is not limited to copolymer polypropylene having a melt mass flow rate of 8-30 g / 10 min as tested under ISO1133-2011 at 230°C and a load of 2.16 kg, including but not limited to random copolymer polypropylene having a melt mass flow rate of 8-30 g / 10 min as tested under ISO1133-2011 at 230°C and a load of 2.16 kg, including but not limited to block copolymer polypropylene having a melt mass flow rate of 8-30 g / 10 min as tested under ISO1133-2011 at 230°C and a load of 2.16 kg.

[0014] The mass percentage of the polypropylene resin in the polypropylene composite material of the present invention is not less than 40%, more preferably not less than 50%, and even more preferably not less than 70%.

[0015] Preferably, the chelate has an organic ligand and a metal ion, and the chelate is obtained by chelating the organic ligand and the metal ion.

[0016] Further preferably, the metal ions include at least one of copper ions, iron ions, and cobalt ions.

[0017] Further preferably, the organic ligand containing a diimine group includes at least one of 1,3-diiminoisoindoline, 2,6-diiminopyridine or 4,6-diiminopyrimidine.

[0018] Further preferably, the organic ligand containing a phenol group includes at least one of acetaminophen, p-aminophenol, o-nitrophenol or catechol.

[0019] More preferably, the organic ligand containing an acid anhydride structure includes at least one of phthalic anhydride and maleic anhydride.

[0020] Preferably, in the chelate, the molar ratio of the organic ligand to the metal ion is (0.5-3):1.

[0021] More preferably, the molar ratio of the organic ligand to the metal ion is (2-3):1.

[0022] Preferably, the mineral filler includes at least one of talc powder, mica powder and wollastonite.

[0023] Preferably, the mineral filler has a mesh size of 1000-3000 mesh, and can specifically be 1000 mesh, 1200 mesh, 1400 mesh, 1600 mesh, 1800 mesh, 2000 mesh, 2200 mesh, 2400 mesh, 2600 mesh, 2800 mesh, 3000 mesh, and the like, as well as specific values between the aforementioned values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively enumerate the specific values included in the aforementioned range. When the mineral filler has a mesh size of 1000-3000 mesh, the overall performance of the polypropylene composite material is better. At the same time, considering that the plating performance of the material, i.e., the peel strength of the coating, decreases slightly with increasing the average particle size of talc powder, the mineral filler has a mesh size of 1000-2000 mesh.

[0024] Preferably, the mass ratio of the mineral filler to the chelate is (5-45): (3-8), further preferably (17-22): (3-8), and specifically can be 5:3, 5:5, 5:8, 17:3, 17:5, 17:8, 18:3, 18:5, 18:8, 19:3, 19:5, 19:8, 20:3, 20:5, 20:8, 21:3, 21:5, 21:8, 22:3, 22:5, 22:8, 45:3, 45:5, 45:8, and the like, as well as specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values included in the range.

[0025] Preferably, the auxiliary agent includes at least one of an antioxidant, a weathering agent, and a lubricant.

[0026] More preferably, the weight portion of the antioxidant is 0.01-1 part.

[0027] More preferably, the weight portion of the weathering agent is 0.01-1 part.

[0028] More preferably, the weight portion of the lubricant is 0.01-1 part.

[0029] More preferably, the lubricant includes at least one of an amide lubricant and a stearic acid lubricant.

[0030] More preferably, the antioxidant includes at least one of hindered phenol antioxidants, phosphite antioxidants, thioester antioxidants and the like.

[0031] Further preferably, the antioxidant includes at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant DLTDP.

[0032] More preferably, the weathering agent includes at least one of benzophenones, benzotriazoles, salicylates, triazines, substituted acrylonitriles, and hindered amine light stabilizers.

[0033] In the present invention, other (functional) additives may be added as needed, including but not limited to antioxidants, weathering agents, lubricants, etc. Conventional antioxidants, weathering agents, and lubricants in the art can be used in the present invention to increase the functionality of the polypropylene composite material and improve the overall performance of the polypropylene composite material.

[0034] On the other hand, the present invention provides a method for preparing the polypropylene composite material, comprising the following steps: uniformly mixing polypropylene, mineral filler, chelate raw materials and additives, and sequentially subjecting the mixture to melt extrusion and granulation to obtain the polypropylene composite material.

[0035] Preferably, the temperature of the melt extrusion is 180-230°C.

[0036] Preferably, the raw materials for the chelate include an organic ligand and a metal salt, at least one of an organic ligand containing a diimine group, an organic ligand containing a phenol group, or an organic ligand containing an acid anhydride structure, and the metal salt includes at least one of a copper salt, an iron salt, and a cobalt salt. During the preparation of the polypropylene composite material, the organic ligand and the metal salt form a chelate through chelation between the organic ligand and the metal ions in the metal salt.

[0037] In addition, the present invention also provides an automobile component prepared according to the polypropylene composite material.

[0038] Preferably, the automotive component comprises at least one of an automotive lamp housing and a reflector. Specifically, the polypropylene composite material can be used to prepare a separate automotive lamp housing and a separate electroplated plate (on which the reflector is formed after electroplating). Alternatively, the polypropylene composite material can be used to prepare an integrated automotive lamp housing comprising a shell-shaped support portion (providing support plasticity and impact resistance) and an electroplated portion connected to the support portion (for electroplating to form a reflective layer, which then serves as a reflective structure). In other words, the automotive lamp housing with a reflective structure can be formed by electroplating within the automotive lamp housing, without the need for a separate electroplated plate or reflector.

[0039] The polypropylene composite material of the present invention combines excellent impact toughness, electroplatability, high coating peel strength, and low precipitation, making it particularly suitable for preparing automotive lamp housings that facilitate electroplating to form reflective structures. The polypropylene composite material of the present invention not only meets the high impact toughness and electroplatability requirements of automotive lamp housings and reflectors, but also solves the problems of yellowing, stickiness, and dirtiness caused by material precipitation over time. Furthermore, it fundamentally solves the problem of poor coordination between the existing use of low-shrinkage polypropylene materials and electroplated ABS to prepare lamp housings and reflectors separately. By integrating the lamp housing and reflector with the polypropylene composite material of the present application, the drawbacks of existing separate designs of lamp housings and reflectors can be overcome, saving costs.

[0040] Compared with the prior art, the present invention has the following beneficial effects: by adding a chelate to the polypropylene composite material, the chelate interacts with the polypropylene and the mineral filler, so that the mineral filler and the polypropylene have good affinity, and the chelate can capture small molecular precipitated substances in the polypropylene composite material, improving the precipitation and sticking of the material, so that the polypropylene composite material has good impact toughness, strong electroplatability, high coating peeling strength and low precipitation, thus meeting the requirements of electroplated products in terms of mechanics and electroplatability. DETAILED DESCRIPTION

[0041] To better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below through specific examples. Unless otherwise specified, the components and raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all the same.

[0042] (1) Polypropylene:

[0043] PP-1: PP SP179, melt mass flow rate 8g / 10min, Lanzhou Petrochemical;

[0044] PP-2: PP K9017, melt mass flow rate 17g / 10min, Taiwan Formosa Chemical Corporation;

[0045] PP-3: PP K9930 (GUANGZHOU), melt mass flow rate 30g / 10min, Guangzhou Petrochemical;

[0046] (2) Mineral fillers

[0047] The mineral fillers described below are purchased in the desired size, or the mineral filler raw materials are sieved to obtain the desired size.

[0048] Talc-1: TYT-777A (3000 mesh), Dongguan Sanzhi, commercially available;

[0049] Talc-2: 6200 (1000 mesh), commercially available in Haicheng, Liaoning;

[0050] Talc-3: Talc 07 (4000 mesh), Haicheng Tongyu Stone Powder Co., Ltd., commercially available;

[0051] Talc-4:510 (800 mesh), commercially available in Haicheng, Liaoning;

[0052] Talc-5: BHS-818S (5000 mesh), Quanzhou Xufeng Powder Raw Materials Co., Ltd., commercially available;

[0053] Mica powder: MICA POWDER (2000 mesh), Guangdong Yuanlei Powder Co., Ltd., commercially available;

[0054] Wollastonite: Wollastonite 885 (2000 mesh), obtained from Shunze Mineral Products Processing Plant, Lingshou County, commercially available;

[0055] (3) Chelates:

[0056] Organic ligand 1: 1,3-diimidoisoindoline, commercially available;

[0057] Organic ligand 2: acetaminophen, commercially available;

[0058] Organic ligand 3: phthalic anhydride, commercially available;

[0059] Organic ligand 4: 3-mercaptopropionic acid, commercially available; copper ion: copper sulfate, commercially available;

[0060] Iron ion: ferric chloride, commercially available;

[0061] Chelate 1: 1,3-diiminoisoindoline, formed by chelation at a molar ratio of 2:1 to form 1,3-diiminoisoindoline copper;

[0062] Chelate 2: Acetaminophen and copper sulfate form acetaminophen through chelation at a molar ratio of 2:1;

[0063] Chelate 3: Phthalic anhydride and copper sulfate react in a molar ratio of 2:1 to form copper phthalate;

[0064] Chelate 4: 1,3-diimidoisoindoline and ferric chloride react in a molar ratio of 3:1 to form 1,3-diimidoisoindoline iron;

[0065] Chelate 5: 3-mercaptopropionic acid and copper sulfate form copper 3-mercaptopropionate through chelation in a molar ratio of 2:1;

[0066] (4) Antioxidants:

[0067] Antioxidants: SONOX 1010 and SONOX 168 were commercially available in a mass ratio of 1:1.

[0068] (5) Lubricant: ethylene bisstearamide, commercially available;

[0069] (6) Weathering agent: Hindered amine light stabilizer T-81, commercially available.

[0070] Examples 1-14 and Comparative Examples 1-6

[0071] A polypropylene composite material, the preparation method of which comprises the following steps:

[0072] (1) Add the raw materials of polypropylene, chelate and auxiliary agents in Table 1-2 into a high-speed mixer and mix thoroughly, then add the mixed materials into the extruder through the main feed port, wherein the raw materials of the chelate are the corresponding organic ligand and metal salt raw materials;

[0073] (2) adding a mineral filler through a side feed port, with an extrusion screw length-diameter ratio of 36-48:1, and extruding and granulating the mixture after mixing, melting, and homogenizing. The extruder temperature is set to: 80-120° C. in zone 1, 180-200° C. in zones 2-5, and 200-230° C. in other zones. After granulation, the polypropylene composite material is obtained, wherein the organic ligand and the metal salt form a chelate through chelation during the mixing, melting, homogenizing, and extrusion granulation processes.

[0074] Table 1

[0075]

[0076] Table 2

[0077] Group / weight Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 PP-2 60 60 60 60 60 60 Talc 2 / / 20 / / 20 Talc 4 / / / 20 / / Talc 5 / / / / 20 / Chelate 1 / 5 / 5 5 / Chelate 5 / / / / / 5 antioxidants 0.2 0.2 0.2 0.2 0.2 0.2 lubricant 0.2 0.2 0.2 0.2 0.2 0.2 Weathering agent 0.2 0.2 0.2 0.2 0.2 0.2

[0078] In order to verify the performance of the polypropylene composite material of the present invention, the polypropylene composite materials prepared in the examples and comparative examples were subjected to performance tests. The specific test methods and qualification standards are as follows:

[0079] (1) Impact strength: The polypropylene composite materials of the above examples and comparative examples were tested for impact strength according to ISO 180-2019; impact performance ≥ 10 kJ / m 2 deemed qualified;

[0080] (2) Precipitation resistance: The polypropylene composite materials of the above examples and comparative examples were injection molded into 50*30 mm injection molded samples according to conventional processes. The precipitation and tack resistance was verified according to the PV1306-2008 standard. The lower the precipitation grade, the better the precipitation and tack resistance, which are <1 (no precipitation at all), S (flat, with slight precipitation but not sticky), 2 (slightly sticky), 3 (sticky), and 4 (strongly sticky). Grades less than 1 are the best, and grade equal to 2 is considered qualified. Grades greater than 2 do not meet the precipitation and tack requirements.

[0081] (3) Electroplatability: The polypropylene composite materials of the above examples and comparative examples were injection molded into rectangular samples of 200*150 mm according to conventional processes. Electroplating was performed using the same process under ultraviolet light. The glossiness of the coating after electroplating was evaluated by visual inspection. The brightness was graded from 1 to 4 based on the reflectivity of the coating surface, with grade 1 being the best. The reference standard for the visual glossiness evaluation method is as follows:

[0082] Level 1 (mirror finish): The coating surface is as bright as a mirror, and facial features and eyebrows can be clearly seen;

[0083] Level 2 (bright): The coating surface is bright, and the facial features and eyebrows can be seen, but the eyebrows are fuzzy;

[0084] Level 3 (semi-bright): The coating surface is slightly bright, and only the outline of facial features can be seen;

[0085] Level 4 (matte): The coating is basically matte and the contours of facial features are not visible;

[0086] The coating grade is less than or equal to 2 and is considered qualified;

[0087] (4) Peel strength of electroplated layer: The samples after electroplating were subjected to high-pressure water washing resistance test according to ISO 16925-2021 standard. The test conditions were: water temperature 40°C, spray time 20s, water flow rate 8L / min, spray distance 130mm. Compared with the DIN55662 standard image, the test was graded from 0 to 5, with grade 0 being the best and grade 5 being the worst. Grades less than or equal to 3 were considered qualified.

[0088] Table 3

[0089]

[0090]

[0091] As can be seen from the examples, the impact strength of the composite material of the present invention is 10-21 kJ / m 2 , precipitation resistance level ≤ 2, electroplating level ≤ 3, electroplating layer peeling strength level is less than or equal to 3.

[0092] Comparative analysis shows that when no mineral filler and chelate are added in Comparative Example 1, the impact performance can be maintained at 40KJ / m 2 However, it cannot meet the requirements of practical application because the inventors found that its flexural strength is only 800MPa and its heat deformation temperature is only 80℃. It is necessary to add mineral fillers to improve its flexural strength and heat deformation temperature. However, in Comparative Example 3, after adding only mineral fillers, although its flexural strength can reach 2700MPa and its heat deformation temperature reaches 120℃, its impact performance drops sharply to 8.7KJ / m 2 , resulting in unqualified impact performance. Although the impact performance of comparative example 2, which only added chelate, increased to 45KJ / m 2 The chelate compound can improve the impact performance of the material to a certain extent. However, due to the lack of mineral filler, its flexural strength and heat deformation temperature are basically equivalent to those of Comparative Example 1. Therefore, Comparative Example 2 cannot meet the actual application requirements. At the same time, combined with the analysis of Example 2 and Comparative Example 3, Example 2 contains both chelate compound and mineral filler. Compared with Comparative Example 3, which lacks chelate compound, it can also be found that the impact performance of Example 2 is significantly higher than that of Comparative Example 3. It can be seen that the chelate compound can improve the impact toughness of the material to a certain extent.

[0093] In comparative example 1 and 3, when not adding metal organic chelate, resistance to separation and electroplatability are poor, and it is substantially impossible to be electroplated, and comparative example 1 and comparative example 3 are compared with embodiment 2 as can be known, and chelate can significantly improve electroplatability and the resistance to separation performance of material.In addition, by comparative example 6, when adopting the chelate of other kinds of organic ligands except the organic ligand containing diimine group, the organic ligand containing phenol group or the organic ligand containing anhydride structure, it is relatively poor to obtain composite material impact toughness, resistance to separation performance and plateability.Meanwhile, adopt the unsuitable mineral filler of particle diameter, it is also impossible to realize good mechanical property, resistance to separation and electroplatability, as shown in comparative example 4-5, when the particle diameter of talcum powder is too large or too small, the impact toughness of material, electroplatability, coating peeling strength and separation performance are all relatively poor.

[0094] This is because: the composite material of the present invention contains a chelate. On the one hand, the specific chelate interacts with polypropylene and a mineral filler of a specific particle size, resulting in a good affinity between the mineral filler and the polypropylene, which not only improves the impact toughness of the material, but also allows the chelate to migrate to the surface of the polypropylene composite material, making the polypropylene material more active on the surface during the electroplating process, significantly improving the electroplatability of the polypropylene material and increasing the durability of the electroplated coating. On the other hand, the chelate captures small molecular precipitates in the polypropylene composite material through electron transfer and covalent bonds, improving the stickiness of the material precipitation, solving the problem of yellowing and dirt on the material surface, and further improving the durability of the material coating to a certain extent. Therefore, the polypropylene composite material of the present invention has good impact toughness, electroplatability, high coating peel strength, and low precipitation, meeting the requirements of electroplated products in terms of mechanics, electroplatability, and appearance.

[0095] In Examples 2, 4, and 5, increasing the average particle size of talc has little effect on the precipitation resistance; as the average particle size of talc increases, the plating ability of the material, i.e., the peeling strength of the coating, decreases slightly; as the average particle size of talc increases, the impact properties of the polypropylene composite material first increase and then decrease; however, under the action of the chelate, the compatibility between the polypropylene substrate and talc can be improved, compensating for the effect of the talc particle size on the impact properties. Therefore, as the average particle size of talc increases, the impact strength only decreases slightly.

[0096] In Example 2, Example 6, and Example 7, the mineral fillers are talc powder, mica powder, and wollastonite, respectively, and all exhibit good impact toughness, precipitation resistance, electroplatability, and high coating peel strength.

[0097] In Example 8, Example 2, and Example 9, the mass ratios of the mineral filler and the chelate are 22:3, 20:5, and 17:8, respectively. As the content of the mineral filler decreases and the content of the chelate increases, the impact resistance of the material increases, and the electroplating property and the coating adhesion are enhanced. However, due to too little mineral filler, the bending strength and heat resistance of the material will be reduced. Therefore, the actual comprehensive performance is better when the mass ratio of the mineral filler and the chelate is (17-22): (3-8).

[0098] It can be seen from Example 2 and Examples 10-12 that the chelates of organic ligands containing diimine groups, organic ligands containing phenol groups or organic ligands containing acid anhydride structures with metal ions have basically the same effects on electroplating properties, precipitation resistance and peeling strength of electroplated layers.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polypropylene composite material, characterized in that The invention comprises the following components in parts by weight: 48-72 parts of polypropylene, 4.5-46 parts of mineral filler, 2.8-8.3 parts of chelate, and 0.4-2.2 parts of additive, wherein the mesh size of the mineral filler is 1000-4000 mesh; the chelate has an organic ligand and a metal ion, and the organic ligand comprises at least one of an organic ligand containing a diimine group, an organic ligand containing a phenol group, and an organic ligand containing an acid anhydride structure.

2. The polypropylene composite material according to claim 1, wherein Include at least one of the following: The metal ions include at least one of copper ions, iron ions, and cobalt ions; The organic ligand containing a diimine group includes at least one of 1,3-diiminoisoindoline, 2,6-diiminopyridine or 4,6-diiminopyrimidine.

3. The polypropylene composite material according to claim 1, wherein Include at least one of the following: The organic ligand containing a phenol group includes at least one of acetaminophen, p-aminophenol, o-nitrophenol or catechol; The organic ligand containing an acid anhydride structure includes at least one of phthalic anhydride and maleic anhydride.

4. The polypropylene composite material according to claim 1, wherein The molar ratio of the organic ligand to the metal ion is (2-3):

1.

5. The polypropylene composite material according to claim 1, wherein The mineral filler includes at least one of talc powder, mica powder and wollastonite.

6. The polypropylene composite material according to claim 1, wherein The mass ratio of the mineral filler to the chelate is (5-45):(3-8).

7. The polypropylene composite material according to claim 1, wherein The polypropylene has a melt mass flow rate of 8-30 g / 10 min when tested at 230° C. and a load of 2.16 kg according to ISO 1133-2011.

8. The polypropylene composite material according to claim 1, wherein The auxiliary agent includes at least one of an antioxidant, a weathering agent, and a lubricant.

9. A method for preparing the polypropylene composite material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing raw materials of polypropylene, mineral filler, chelate and auxiliary agent, and sequentially performing melt extrusion and granulation to obtain the polypropylene composite material.

10. An automotive part made from the polypropylene composite material according to any one of claims 1 to 8.

Images