Easily-sprayed mineral powder filled PPA / PA66 alloy composite material as well as preparation method and application thereof

Abstract

The invention discloses a mineral powder filled PPA / PA66 alloy composite material easy to spray as well as a preparation method and application thereof. The composite material comprises the following components in parts by weight: 35-45 parts of PA66 resin, 5-15 parts of PPA resin, 40-50 parts of mineral powder, 0.2-0.6 part of an antioxidant, 0.1-0.3 part of a nucleating agent, 1-2 parts of a flow mark improver A, 0.5-1 part of a flow mark improver B, 0.3-0.6 part of a flow promoter and 1-2 parts of a black auxiliary agent. Wherein the mineral powder is talcum powder master batch subjected to surface treatment by a silane coupling agent; the flow mark improver A comprises at least one of a styrene-maleic anhydride copolymer, maleic anhydride grafted POE (Polyolefin Elastomer) and maleic anhydride grafted EPDM (Ethylene-Propylene-Diene Monomer); and the flow mark improving agent B comprises at least one of polymethylsiloxane master batch of nylon 6 or nylon 66 carrier and polymethylsiloxane. Through the synergistic effect of the components of the raw materials, the prepared composite material has surface smoothness while the mechanical property is guaranteed, the injection molding defect is avoided, and the strict requirement of the automobile industry for the high-quality appearance of the small oil tank door can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and in particular relates to an easily sprayable mineral powder-filled PPA / PA66 alloy composite material, a preparation method thereof, and applications thereof. Background Art

[0002] In recent years, with the rapid development of the automotive industry, consumers' demands for vehicle quality have continuously increased. They are not only concerned about the overall safety performance and functionality of the vehicle, but also increasingly discerning about the appearance details. As a crucial component of the vehicle's exterior, the surface quality of the fuel tank door directly influences consumers' purchasing decisions. While traditional metal fuel tank doors offer high strength, they are susceptible to rust, making them a key concern for vehicle body corrosion protection. To fundamentally address rust and achieve lightweighting, plastic fuel tank doors are gradually replacing metal materials, becoming an industry trend. However, plastic fuel tank doors still face numerous challenges in their application, such as high material costs, deformation after injection molding, and potential color variations after assembly. In particular, the surface quality of the substrate directly impacts the spraying effect and the final paint film appearance.

[0003] At present, defects such as flow marks, compression marks, burrs, shrinkage holes, and pitting are prone to occur in the injection molding process of plastic fuel tank doors, resulting in an uneven surface of the substrate, affecting the stability of the subsequent spraying process and the quality of the paint film.

[0004] Therefore, how to provide a mineral powder reinforced composite material with excellent surface quality, easy spraying and good paint film appearance is a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] The object of the present invention is to provide an easily sprayable mineral powder-filled PPA / PA66 alloy composite material and its preparation method and application, so as to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the first aspect of the present invention provides an easily sprayable mineral powder-filled PPA / PA66 alloy composite material, wherein the composite material comprises the following components in parts by weight: 35-45 parts of PA66 resin, 5-15 parts of PPA resin, 40-50 parts of mineral powder, 0.2-0.6 parts of antioxidant, 0.1-0.3 parts of nucleating agent, 1-2 parts of flow mark improver A, 0.5-1 parts of flow mark improver B, 0.3-0.6 parts of flow promoter and 1-2 parts of black additive; wherein the mineral powder is a talc masterbatch surface-treated with a silane coupling agent; the flow mark improver A comprises at least one of styrene-maleic anhydride copolymer, maleic anhydride grafted POE, and maleic anhydride grafted EPDM; the flow mark improver B comprises at least one of a polymethylsiloxane masterbatch with a nylon 6 or nylon 66 carrier and polymethylsiloxane.

[0007] In the first aspect, the intrinsic viscosity of the PA66 resin is 2.45 to 2.8 dL / g.

[0008] In the first aspect, the intrinsic viscosity of the PPA resin is 1.0 to 2.5 dL / g.

[0009] In the first aspect, the antioxidant includes a primary antioxidant and a high-temperature resistant secondary antioxidant, the primary antioxidant is N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the high-temperature resistant secondary antioxidant is bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

[0010] In the first aspect, the nucleating agent includes at least one of carboxylic acid calcium salt, aryl sulfonate calcium, E wax, and ultrafine talc.

[0011] In the first aspect, the flow promoter comprises at least one of a hyperbranched compound, TAF, and SEED.

[0012] In the first aspect, the black auxiliary agent is a mixture of carbon black masterbatch and aniline black masterbatch in a PE carrier.

[0013] The second aspect of the present invention provides a preparation method of an easily sprayable mineral powder-filled PPA / PA66 alloy composite material, the preparation method comprising: drying PA66 resin and PPA resin at 80-100°C for 4-6 hours; weighing the raw material components according to the weight proportions of the easily sprayable mineral powder-filled PPA / PA66 alloy composite material described in the first aspect; pre-mixing the weighed PA66 resin and PPA resin in a high-speed mixer to obtain an initial mixture; sequentially adding mineral powder, antioxidant, nucleating agent, flow mark improver A, flow mark improver B, flow promoter and black additive to the high-speed mixer, mixing evenly to obtain a secondary mixture; setting the process parameters of a twin-screw extruder, and transferring the secondary mixture to the twin-screw extruder for heating and melting, extrusion granulation, and sieving to obtain a PPA / PA66 alloy composite material.

[0014] In the second aspect, the process parameters include: the screw speed of the twin-screw extruder is 200-400 r / min; the temperature of each melt extrusion section is: 230℃-280℃ for sections 2-4, 240℃-270℃ for sections 5-8, 230℃-240℃ for sections 9-10, and 250℃-260℃ for the die head.

[0015] A third aspect of the present invention provides an application of the easily sprayable mineral powder-filled PPA / PA66 alloy composite material described in the first aspect in a small door of an automobile fuel tank.

[0016] Beneficial effects: The present invention provides an easily sprayable mineral powder-filled PPA / PA66 alloy composite material, which comprises the following components in parts by weight: 35-45 parts of PA66 resin, 5-15 parts of PPA resin, 40-50 parts of mineral powder, 0.2-0.6 parts of antioxidant, 0.1-0.3 parts of nucleating agent, 1-2 parts of flow mark improving agent A, 0.5-1 parts of flow mark improving agent B, 0.3-0.6 parts of flow promoter, and 1-2 parts of black additive; wherein the mineral powder is a talc masterbatch surface-treated with a silane coupling agent; the flow mark improving agent A comprises at least one of styrene-maleic anhydride copolymer, maleic anhydride grafted POE, and maleic anhydride grafted EPDM; and the flow mark improving agent B comprises at least one of a polymethylsiloxane masterbatch with a nylon 6 or nylon 66 carrier and polymethylsiloxane. Using PA66 and PPA resins as the matrix resins, a talc masterbatch surface-treated with a silane coupling agent enhances interfacial bonding with the matrix resin and reduces interfacial defects. Flow mark improvers A and B are compounded to improve the dispersibility of mineral powder and black additives in the matrix resin, enhancing the fluidity and surface gloss of the product. Nucleating agents and flow promoters are also incorporated to further improve the compatibility of the material. This invention utilizes the synergistic effects of the various raw material components to produce a composite material that maintains mechanical properties while maintaining a smooth surface and avoiding injection molding defects. This composite material can meet the automotive industry's stringent requirements for high-quality appearance for fuel tank doors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic flow chart of a method for preparing an easily sprayable mineral powder-filled PPA / PA66 alloy composite material provided by the present invention; Figure 2 These are the appearance renderings of the large panels of the embodiments of the present invention and the comparative examples; Figure 3 These are appearance renderings of injection-molded samples of the embodiments of the present invention and the comparative example. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific embodiments and examples are for illustrating the present invention, rather than for limiting the present invention.

[0020] Throughout the specification, unless otherwise specifically indicated, the terms used herein are to be understood in the manner commonly used in the art. Thus, 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 application belongs. If there is a conflict between the present specification and the definitions of terms, the present specification prevails.

[0021] Unless otherwise specifically indicated, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or obtained by existing methods.

[0022] The present application provides an easy-to-spray mineral powder filled PPA / PA66 alloy composite material, which comprises the following components in parts by weight: PA66 resin 35-45 parts, PPA resin 5-15 parts, mineral powder 40-50 parts, antioxidant 0.2-0.6 parts, nucleating agent 0.1-0.3 parts, flow mark improver A 1-2 parts, flow mark improver B 0.5-1 part, flow promoter 0.3-0.6 parts and black aid 1-2 parts; wherein the mineral powder is talc powder masterbatch treated by silane coupling agent; the flow mark improver A comprises at least one of styrene-maleic anhydride copolymer, maleic anhydride grafted POE and maleic anhydride grafted EPDM; the flow mark improver B comprises at least one of polydimethylsiloxane masterbatch of nylon 6 or nylon 66 carrier and polydimethylsiloxane.

[0023] Specifically, the present application provides an easy-to-spray mineral powder filled PPA / PA66 alloy composite material, which comprises the following components in parts by weight: PA66 resin 35-45 parts, PPA resin 5-15 parts, mineral powder 40-50 parts, antioxidant 0.2-0.6 parts, nucleating agent 0.1-0.3 parts, flow mark improver A 1-2 parts, flow mark improver B 0.5-1 part, flow promoter 0.3-0.6 parts and black aid 1-2 parts; wherein the mineral powder is talc powder masterbatch treated by silane coupling agent; the flow mark improver A comprises at least one of styrene-maleic anhydride copolymer, maleic anhydride grafted POE and maleic anhydride grafted EPDM; the flow mark improver B comprises at least one of polydimethylsiloxane masterbatch of nylon 6 or nylon 66 carrier and polydimethylsiloxane. With PA66 resin and PPA resin as the matrix resin, the interface bonding force between the talc powder masterbatch treated by silane coupling agent and the matrix resin is enhanced, and the interface defects are reduced; the dispersibility of the mineral powder and the black aid in the matrix resin is improved by compounding the flow mark improver A and the flow mark improver B, so as to improve the fluidity and surface gloss of the product material; and the compatibility of the material is further improved by combining the nucleating agent and the flow promoter. Through the synergistic effect between the components of the raw materials, the prepared composite material has surface smoothness while ensuring the mechanical properties, and avoids injection molding defects, which can meet the stringent requirements of the automobile industry for the high-quality appearance of the oil tank door.

[0024] It should be noted that the mineral powder is a talc masterbatch surface-treated with a silane coupling agent. This enhances the interfacial bonding between the filler and the matrix resin, reduces the size of talc agglomerates from 5-10μm to 1-3μm, improves dispersion uniformity by 50-70%, and reduces interfacial defects. One end of the silane coupling agent reacts with active groups such as hydroxyl groups on the filler surface to form covalent bonds; the amino group at the other end forms a hydrogen bond network with the PA66 resin, strengthening interfacial forces. The amino group also condenses with the PA66 matrix at high temperatures to form new amide bonds. This allows the mineral powder masterbatch to be better dispersed in the PPA / PA66 alloy material and tightly bond to the matrix, reducing interfacial defects.

[0025] Flow Mark Improver A is a maleic anhydride grafted copolymer with both polar aldehyde groups and non-polar olefin segments. When the maleic anhydride grafted copolymer is melt-blended with PA, the active anhydride groups grafted onto the PO backbone react with the amino groups at the ends of the PA molecules, initially forming amide bonds that, after ring closure, form imide bonds. This grafted copolymer at the interface strengthens the interphase adhesion through covalent bonds, expanding the distribution range of the dispersed phase within the continuous phase, ensuring a more uniform distribution of fillers such as mineral powder and black additives within the PPA / PA66 composite. This also facilitates overall material flow and improves molding quality.

[0026] Flow Mark Improver B is a polymethylsiloxane compound. Its silicon-oxygen bonds form hydrogen bonds with the hydroxyl groups on the surface of the mineral powder, reducing filler agglomeration and interfacial defects through an "anchoring effect." Polymethylsiloxane compounds also have low surface tension and a low coefficient of friction, forming a lubricating film between the mineral powder and the resin, further improving the material's fluidity, scratch resistance, and wear resistance.

[0027] Furthermore, the combination of Flow Mark Modifiers A and B improves the dispersion of mineral powder and black additives in PPA / PA66 composites, creates covalent bonds that strengthen interfacial adhesion, and expands the distribution range of the dispersed phase within the continuous phase. This effectively enhances product fluidity and surface gloss, improves molding quality, eliminates surface defects such as flow marks and injection compression marks, and enhances the appearance of the painted film after spraying. Furthermore, PPA resin exhibits excellent compatibility with PA66 resin, enhancing its ability to bond with other components, ensuring the composite's dimensional stability and further facilitating surface printing, coating, and plating.

[0028] In some possible embodiments, the antioxidant includes a main antioxidant and a high-temperature resistant auxiliary antioxidant, the main antioxidant is N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the high-temperature resistant auxiliary antioxidant is bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

[0029] In this application, the antioxidant consists of a primary antioxidant and a secondary antioxidant. The primary antioxidant includes hindered phenol antioxidants such as N,N'-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexanediamine, and the secondary antioxidant includes phosphite antioxidants such as bis(2,4-dicumylphenyl)pentaerythritol diphosphite. The mechanism of action of the primary antioxidant is to inhibit the initiation and propagation of the oxidation reaction by capturing free radicals. In PPA / PA66 composite materials, the primary antioxidant can effectively remove free radicals generated during the processing and long-term use, which helps to prevent the oxidative degradation of the polymer chains in the composite material, thereby maintaining the mechanical properties, appearance and dimensional stability of the material. The mechanism of action of the secondary antioxidant is mainly to exert an antioxidant effect by decomposing hydroperoxides. Hydroperoxides are intermediate products in the oxidation reaction, which will further trigger a free radical chain reaction and accelerate the aging of the material. By working synergistically with the primary antioxidant, the secondary antioxidant can play a role in different oxidation stages to form a complete antioxidant system.

[0030] In some possible embodiments, the nucleating agent includes at least one of carboxylic acid calcium salt, aryl sulfonate calcium, E wax, and ultrafine talc.

[0031] In this application, the nucleating agent accelerates the crystallization rate and refines the grain size during the alloy material crystallization process. The polar groups of the nucleating agent hydrogen bond with the amide groups of the PA66 resin and simultaneously generate π-π interactions with the aromatic rings of the PPA resin. This provides heterogeneous crystallization sites for the PPA / PA66 composite, accelerating the crystallization rate, inhibiting the formation of coarse spherulites, and improving material uniformity.

[0032] In some possible embodiments, the flow promoter includes at least one of hyperbranched compounds, TAF, and SEED.

[0033] In this application, the flow promoter acts as an internal lubricant, reducing friction between the mineral powder and the resin, improving material fluidity. The coating effect of the flow promoter reduces exposed mineral powder edges and improves surface gloss. Furthermore, the flow promoter forms hydrogen bonds with the hydroxyl groups on the mineral powder surface, reducing filler agglomeration through an "anchoring effect" and ensuring uniform dispersion of the mineral powder within the PPA / PA66 alloy.

[0034] In some possible embodiments, the black additive is a mixture of carbon black masterbatch and aniline black masterbatch in a PE carrier.

[0035] Carbon black masterbatch is low-cost and offers excellent UV resistance, meeting the UV resistance requirements of automotive exteriors. Aniline black masterbatch, while more expensive, has polar molecules that match the polarity of PA, allowing for uniform dispersion in the PPA / PA66 alloy. This effectively prevents the "fog" or "pitting" caused by agglomeration, enhances interfacial bonding, and reduces surface defects, resulting in a mirror-like black finish on the finished product, meeting the high-gloss requirements of automotive exteriors and other applications. In this application, a carbon black masterbatch and aniline black masterbatch are compounded to balance cost and appearance, achieving the black, high gloss, mirror-like finish, and UV resistance of aniline black masterbatch while also improving the poor dispersion of carbon black masterbatch and reducing costs.

[0036] Based on a general inventive concept, such as Figure 1 As shown, the present invention also provides a method for preparing an easily sprayable mineral powder-filled PPA / PA66 alloy composite material, the preparation method comprising: S1. Dry PA66 resin and PPA resin at 80-100°C for 4-6 hours; S2. Weighing the raw material components according to the weight proportions of the easily sprayable mineral powder-filled PPA / PA66 alloy composite material described in the first aspect; S3, placing the weighed PA66 resin and the PPA resin in a high-speed mixer for premixing to obtain an initial mixture; S4, adding mineral powder, antioxidant, nucleating agent, flow mark improver A, flow mark improver B, flow promoter and black additive to the high-speed mixer in sequence, mixing well to obtain a secondary mixture; S5. Set the process parameters of the twin-screw extruder, and transfer the secondary mixture to the twin-screw extruder for heating and melting, extrusion granulation, and sieving to obtain a PPA / PA66 alloy composite material; wherein the process parameters include: the screw speed of the twin-screw extruder is 200-400 r / min; the temperature of each melt extrusion section is: 230℃-280℃ for sections 2-4, 240℃-270℃ for sections 5-8, 230℃-240℃ for sections 9-10, and 250℃-260℃ for the die head.

[0037] Specifically, a PPA / PA66 alloy composite material with uniform particles was prepared according to the above experimental steps, which is convenient for transportation and is also conducive to the subsequent preparation of an easy-to-spray automobile fuel tank door through an injection molding process.

[0038] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0039] The raw materials used in the examples and comparative examples are as follows: PA66 resin: DuPont PA66 45HSB; PPA resin: Solvay AS-4133L; Mineral powder: talc masterbatch, Haicheng Hetai TP-888AW; Antioxidant: a mixture of primary antioxidant and secondary antioxidant in a ratio of 1:1; primary antioxidant: BASF antioxidant 1098; secondary antioxidant: BASF antioxidant 608; Nucleating agent: Clariant E wax; Flow mark improver A: Ningbo Nengzhiguang N428; American DuPont Fusabond™ N416; Flow mark improver B: Clariant NE; Flow promoter: Brüggemann TAF; Black additives: Guangzhou Yinuo JYN2014; BASF L0080.

[0040] The raw material components in Examples 1-3 and Comparative Examples 1-4 of the present invention are shown in Table 1 below in parts by weight: Table 1 Distribution ratio of each group of raw materials The formulation ratios provided in Examples 1-3 and Comparative Examples 1-4 were all used to prepare mineral powder-filled PPA / PA66 alloy composite materials according to the following experimental steps: (1) Weigh the raw material components according to the respective formula ratios of the examples and comparative examples. The PA66 resin and PPA resin need to be dried at 100°C for 4 hours before weighing. (2) The weighed PA56 resin and PPA resin were placed in a high-speed mixer for premixing to obtain an initial mixture; (3) Add the weighed mineral powder, antioxidant, nucleating agent, flow mark improver A, flow mark improver B, flow promoter and black additive into the high-speed mixer in sequence and mix them evenly to obtain a secondary mixture; (4) The secondary mixed material is added from the main feed port and transported to the screw cavity of the twin-screw extruder, heated and melted in the screw cavity, extruded into granules, and sieved to obtain a PPA / PA66 alloy composite material; wherein, the screw speed of the twin-screw extruder is 300 r / min, and the temperatures of each melt extrusion section in the twin-screw extruder are: 230℃-280℃ for sections 2-4, 240℃-270℃ for sections 5-8, 230℃-240℃ for sections 9-10, and 250℃-260℃ for the die head.

[0041] Preparation of test specimens: The easily sprayable mineral powder reinforced PPA / PA66 alloy composite materials prepared in the above Examples 1-3 and Comparative Examples 1-4 were injection molded into large plates of 4 mm × 100 mm × 100 mm and specimens that met ISO standards in an injection molding machine at 260-300°C.

[0042] The test specimens prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance testing. The test results are shown in Table 2 below. The specific test standards are as follows: Tensile performance test: the test standard is ISO-527, and the tensile rate is 50 mm / min.

[0043] Bending performance test: the test standard is ISO-178, and the bending rate is 2 mm / min.

[0044] Charpy notched impact strength: The test standard is ISO-179.

[0045] Mass melt index: Test standard is ISO 1133-1, test temperature / load: 260℃ / 5KG, die selection: full die.

[0046] Appearance test: Under standard light source, observe the plastic surface with naked eyes to see whether the color is uniform, whether there are impurities (black spots, white spots, etc.), whether there are defects such as deformation, scratches, bubbles, pitting, etc.

[0047] Flow mark test: Observe the large shrinkage plate after injection molding with the naked eye to see if there are flow marks or other flow marks on the surface in the form of concentric circles or spirals centered in the gate direction.

[0048] Table 2 Test results From the above experimental data, it can be seen that when the test results of Examples 1-3 are compared with the test results of Comparative Examples 1-4, after adding different proportions of PPA resin to Examples 1-3, the mechanical properties are significantly improved, and the appearance of the large board is also slightly improved, from basically qualified to good and qualified; when the test results of Examples 1-3 are compared with the test results of Comparative Examples 2-4, Comparative Example 2 does not add flow mark improver A and flow mark improver B, the flow marks are serious, and the appearance is unqualified; Comparative Example 3 and Comparative Example 4 add flow mark improver A and flow mark improver B respectively, the flow marks are improved to a certain extent, but the appearance is still unqualified; and after adding flow mark improver A and flow mark improver B to Examples 1-3, the appearance of the large board is significantly improved, the flow marks are significantly reduced, the surface is smooth and neat, and there are no injection compression marks, scratches and damage, burrs, shrinkage holes, demoulding marks, injection point pitting and other appearance defects. The large board effect is as follows Figure 2 In addition, the PPA / PA66 alloy composite materials prepared in Example 1 and Comparative Example 1 were subjected to injection molding, and the results were as follows: Figure 3 shown.

[0049] In summary, the PPA / PA66 alloy composite material prepared using the formulation ratios described in this application exhibits excellent injection molding and paint finish, with a good paint film appearance that meets the requirements of automotive OEMs. The preparation method features a simple process with controllable parameters. Efficient production can be achieved using common high-speed stirring and twin-screw extrusion equipment, making industrial-scale manufacturing easy and promising for market expansion.

[0050] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0052] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A PPA / PA66 alloy composite material filled with mineral powder that is easy to spray, characterized in that: The composite material comprises the following components in parts by weight: 35-45 parts of PA66 resin, 5-15 parts of PPA resin, 40-50 parts of mineral powder, 0.2-0.6 parts of antioxidant, 0.1-0.3 parts of nucleating agent, 1-2 parts of flow mark improving agent A, 0.5-1 parts of flow mark improving agent B, 0.3-0.6 parts of flow promoter and 1-2 parts of black additive; Wherein, the mineral powder is a talc masterbatch that has been surface-treated with a silane coupling agent; The flow mark improving agent A comprises at least one of styrene-maleic anhydride copolymer, maleic anhydride grafted POE, and maleic anhydride grafted EPDM; The flow mark improving agent B includes at least one of polymethylsiloxane masterbatch and polymethylsiloxane with nylon 6 or nylon 66 as carrier.

2. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The intrinsic viscosity of the PA66 resin is 2.45-2.8 dL / g.

3. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The intrinsic viscosity of the PPA resin is 1.0 to 2.5 dL / g.

4. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The antioxidant includes a main antioxidant and a high-temperature resistant auxiliary antioxidant. The main antioxidant is N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexanediamine, and the high-temperature resistant auxiliary antioxidant is bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

5. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The nucleating agent includes at least one of carboxylic acid calcium salt, aryl sulfonate calcium, E wax, and ultrafine talc.

6. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The flow promoter includes at least one of hyperbranched compounds, TAF, and SEED.

7. The easily sprayable mineral powder filled PPA / PA66 alloy composite material according to claim 1, characterized in that: The black auxiliary agent is a mixture of carbon black masterbatch and aniline black masterbatch in a PE carrier.

8. A method for preparing a sprayable mineral powder filled PPA / PA66 alloy composite material, characterized in that: The preparation method comprises: Dry PA66 resin and PPA resin at 80-100°C for 4-6 hours; Weigh the raw material components according to the weight proportions of the easily sprayable mineral powder-filled PPA / PA66 alloy composite material according to any one of claims 1 to 7; The weighed PA66 resin and the PPA resin are placed in a high-speed mixer for premixing to obtain an initial mixture; Adding mineral powder, antioxidant, nucleating agent, flow mark improving agent A, flow mark improving agent B, flow promoter and black additive to the high-speed mixer in sequence, mixing evenly, to obtain a secondary mixture; The process parameters of the twin-screw extruder are set, and the secondary mixture is transferred to the twin-screw extruder for heating and melting, extrusion granulation, and screening to obtain a PPA / PA66 alloy composite material.

9. The method for preparing the easily sprayable mineral powder-filled PPA / PA66 alloy composite material according to claim 8, characterized in that: The process parameters include: the screw speed of the twin-screw extruder is 200-400 r / min; the temperature of each melt extrusion section is: 230℃-280℃ for sections 2-4, 240℃-270℃ for sections 5-8, 230℃-240℃ for sections 9-10, and 250℃-260℃ for the die head.

10. Use of the easily sprayable mineral powder-filled PPA / PA66 alloy composite material according to any one of claims 1 to 7 in a small door of an automobile fuel tank.

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