Flame-retardant high-impact-resistant PP composite material and preparation method thereof

Abstract

The invention belongs to the technical field of thermoplastic composite materials, and particularly provides a flame-retardant high-impact-resistance PP composite material and a preparation method thereof. The flame-retardant high-impact-resistance PP composite material comprises a PP flame-retardant material and glass fabric, the PP flame-retardant material comprises the following components: polyolefin resin, a compatilizer, a flow promoter, a flame retardant, an anti-impact agent and an antioxidant. The flame-retardant high-impact-resistance PP composite material prepared by the invention has excellent impact resistance and flame retardance.

Description

Technical Field

[0001] This application belongs to the field of thermoplastic composite materials technology, and in particular relates to a flame-retardant high-impact PP composite material and its preparation method. Background Technology

[0002] Thermoplastic composites are a new type of lightweight, high-strength material composed of two or more materials. The matrix is ​​thermoplastic resin, and the composite material is made with fibers as reinforcement, possessing a variety of excellent properties. With the development of modern science and technology, non-metallic materials, with advantages such as lightweight, high strength, corrosion resistance, and ease of synthesis, are increasingly replacing traditional metallic materials and are widely used in various industries. Currently, my country's composite materials industry is facing a new period of rapid development, driven by factors such as the development of the automotive industry, large-scale railway construction, and large aircraft projects. Driven by huge market demand, the composite materials industry will have vast development potential.

[0003] Polypropylene (PP) is one of the five major general-purpose plastics. It possesses good physical properties, is easy to process and mold, and is relatively inexpensive. However, its mechanical properties are relatively low, and its thermal properties are poor, limiting its application in structural components. In practical applications, filler modification is commonly used to effectively improve the mechanical and thermal properties of PP. Glass fiber is a high-performance inorganic non-metallic material with excellent insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, and is widely used in resin reinforcement.

[0004] Patent application CN103240929A discloses a high-strength, lightweight polypropylene composite board and its manufacturing method. This material is non-flame-retardant and, compared to long glass fiber reinforced polypropylene, its Charpy impact strength is more than doubled, specifically 79 kJ / m². 2 The low impact strength and non-flame-retardant nature of the material limit its application. Patent application CN111572059A discloses a method for continuous glass fiber reinforced thermoplastic composites, primarily addressing the difficulties in dispersing and impregnating continuous glass fibers in high molecular weight, high melt viscosity thermoplastic resin melts. However, it does not improve the material's impact resistance, especially its notched impact performance. Therefore, effectively improving the impact resistance of thermoplastic composites has become a pressing issue in this field. Summary of the Invention

[0005] To address the aforementioned issues and further improve the impact resistance and flame retardant properties of thermoplastic composites, this application provides a flame-retardant high-impact PP composite material and its preparation method.

[0006] This application first provides a flame-retardant, high-impact PP composite material, including flame-retardant PP material and fiberglass cloth; The PP flame retardant material comprises the following components in parts by weight: 40-50 parts of polyolefin resin, 5-7 parts of flow aid, 2-3 parts of compatibilizer, 25-35 parts of flame retardant, 8-15 parts of synergistic flame retardant, 5-10 parts of impact agent, and 0.2-0.5 parts of antioxidant.

[0007] Furthermore, the fiberglass cloth is a roving woven fabric without twisting.

[0008] Furthermore, the impact strength of the polyolefin resin is >100 J / m.

[0009] Furthermore, the impact strength of the polyolefin resin is >400 J / m.

[0010] Furthermore, the flow aid is a PP flow aid, and the melt flow rate of the PP flow aid is ≥100g / 10min (230℃, 2.16kg).

[0011] Furthermore, the compatibilizer is a polymer material grafted with organic functional groups that have chelating ability.

[0012] Furthermore, the flame retardant is a brominated flame retardant; And / or, the synergistic flame retardant is an antimony-based synergistic flame retardant.

[0013] Furthermore, the flame retardant is one or more of Yobo B-972, Yobo B-943, and Yobo B971.

[0014] Furthermore, the impact-resistant agent is an olefin-based elastomer; And / or, the antioxidant is one or more of hindered phenolic antioxidants, phosphate ester antioxidants and thiolated antioxidants.

[0015] Furthermore, the antioxidant is one or more of antioxidant 3114, antioxidant 1024, antioxidant 686, and antioxidant DSTP.

[0016] Furthermore, the PP flame-retardant material also includes 3-5 parts of a toughening agent; the preparation method of the toughening agent includes the following steps: S1: In an alkaline environment, a double-layer magnesium aluminum hydroxide was prepared using magnesium chloride hexahydrate and aluminum chloride hexahydrate; S2: A toughening agent is obtained by sequentially coating a double layer of magnesium aluminum hydroxide with polydopamine and polyaniline.

[0017] Furthermore, the fiberglass cloth is a plain weave fabric made of untwisted roving woven on a checkered cloth loom, with a weight of 400-600 g / cm³. 2 .

[0018] Furthermore, the fiberglass cloth is one of fiberglass cloth EWR400, fiberglass cloth EWR500 and fiberglass cloth EWR600.

[0019] This application also provides a method for preparing a flame-retardant, high-impact PP composite material, comprising the following steps: 1) Mix polyolefin resin, flow aid, compatibilizer, flame retardant, synergistic flame retardant, impact agent, and antioxidant, and then melt extrude and granulate to obtain PP flame retardant material; 2) Take PP flame-retardant material and fiberglass cloth in a mass ratio of 4-6:6-4, press them into shape, and obtain flame-retardant high-impact PP composite material; The process parameters for melt extrusion granulation are: main machine speed 300-500 r / min, and processing temperature of each zone 200-220℃; The pressing temperature is 200-220℃ and the pressure is 20-30MPa.

[0020] Compared with the prior art, this application has the following beneficial effects: 1. Using high-impact PP as the matrix material ensures that the PP flame-retardant material has high impact strength. Since the PP flame-retardant material needs to be impregnated into fiberglass cloth, a high melt index is required. However, the melt index of high-impact PP is in the range of 20-40 g / 10 min. After adding flame retardant modification, the flow properties will be worse. Therefore, a certain proportion of high melt index PP needs to be added to improve the impregnation efficiency of the material and reduce processing time without affecting the performance.

[0021] 2. Compatibilizer YY-503A possesses chelating organic functional groups that can bind to the C-Br bonds in brominated flame retardants, effectively dispersing them and activating the surface of the synergist Sb₂O₃, preventing its aggregation and making its surface organic. This significantly improves the compatibility of the flame retardant, synergist, and the substrate PP. Furthermore, YY-503A has a viscosity of 250-300 cps, effectively increasing the melt index and improving the impregnation effect, thereby enhancing material performance.

[0022] 3. The impact-resistant agent uses an olefin-based elastomer, which has better compatibility with the matrix material PP. It can greatly improve the impact strength while ensuring tensile and flexural strength.

[0023] 4. When subjected to external impact, the double-layer magnesium aluminum hydroxide in the toughening agent has a certain degree of toughness due to the change in the distance between the layers. At the same time, the polyaniline coating on its surface forms an elastic buffer layer, which can further enhance the toughening effect of the toughening agent. Detailed Implementation

[0024] The technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] 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. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0027] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0028] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0029] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0030] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0031] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0032] In this application, "above" or "below" includes the number itself. For example, "below 1" includes 1.

[0033] In this application, room temperature refers to 0-40°C, including but not limited to 10-40°C, or further to 20-30°C.

[0034] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0035] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0036] The fiberglass cloth used in the embodiments and comparative examples in this application is from Chongqing International Composite Materials Co., Ltd.

[0037] Example 1 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Youbo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main machine speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0038] Example 2 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4.5 kg of polypropylene resin BH3800, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 2.5 kg of flame retardant Yobo B-943, 1.4 kg of synergistic flame retardant I-138, 0.9 kg of impact agent 6902, 10 g of antioxidant 1024, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 300 r / min, and the processing temperatures are as follows: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Weigh 3.9 kg of PP flame retardant material and 3.8 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 25 MPa to obtain a flame retardant high impact PP composite material.

[0039] Example 3 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 5 kg of polypropylene resin 4306, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3 kg of flame retardant Yobo B-971, 0.8 kg of synergistic flame retardant I-138, 0.5 kg of impact agent 6902, 30 g of antioxidant 3114, and 20 g of antioxidant DSTP and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 400 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Weigh 5 kg of PP flame retardant material and 6.5 kg of EWR500 fiberglass cloth, press them into shape at a temperature of 210℃ and a pressure of 30 MPa to obtain a flame retardant high impact PP composite material.

[0040] Example 4 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4.2 kg of polypropylene resin EP300H, 0.6 kg of flow aid EA5076, 0.3 kg of compatibilizer YY-503A, 3.5 kg of flame retardant Yobo B-972, 0.8 kg of synergistic flame retardant I-138, 0.6 kg of impact agent 6902, 10 g of antioxidant 1024, and 20 g of antioxidant DSTP and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 450 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 200℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Weigh 5 kg of PP flame retardant material and 6 kg of glass fiber cloth EWR500, press them into shape at a temperature of 210℃ and a pressure of 27 MPa to obtain a flame retardant high impact PP composite material.

[0041] Example 5 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 0.7 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3 kg of flame retardant Yobo B-972, 1.4 kg of synergistic flame retardant I-138, 0.5 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant DSTP and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 480 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 200℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 210℃, Zone 10 210℃, and die head 210℃ to obtain PP flame retardant material; 2) Weigh 5 kg of PP flame retardant material and 3 kg of EWR600 fiberglass cloth, press them into shape at a temperature of 200℃ and a pressure of 20 MPa to obtain a flame retardant high impact PP composite material.

[0042] Example 6 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 0.6 kg of flow aid EA5076, 0.3 kg of compatibilizer YY-503A, 2.8 kg of flame retardant Youbo B-971, 1.5 kg of synergistic flame retardant I-138, 0.8 kg of impact agent 6902, and 20 g of antioxidant 1024. Put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main machine speed is 300 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 210℃, Zone 10 210℃, and die head 210℃ to obtain PP flame retardant material. 2) Weigh 5 kg of PP flame retardant material and 3.3 kg of EWR600 fiberglass cloth, press them into shape at a temperature of 200℃ and a pressure of 30 MPa to obtain a flame retardant high impact PP composite material.

[0043] Example 7 The preparation method of the flame-retardant, high-impact PP composite material in this embodiment is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 20 g of toughening agent, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Yobo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0044] The toughening agent in this embodiment is prepared as follows: S1: Weigh 100g of deionized water and 1g of sodium carbonate and add them sequentially to a 500mL three-necked flask. Purge with nitrogen and heat to 65℃. Stir at 400rpm for 10min. Then, add a mixed solution consisting of 8.1g of magnesium chloride hexahydrate, 4.8g of aluminum chloride hexahydrate, and 97g of deionized water dropwise at a rate of 1.5mL / min. During the dropwise addition, add 2mol / L sodium hydroxide solution to adjust the pH of the system and stabilize it between 10 and 11. After the mixed solution is added, continue stirring for 10min. Then, place the resulting solution in an oven and crystallize at 65℃ for 10h. After filtration, washing, and drying, place it in a muffle furnace and heat to 500℃ at a rate of 5℃ / min. Hold at this temperature for 5h to obtain a double-layer magnesium aluminum hydroxide. S2: Mix 5g of double-layer magnesium aluminum hydroxide with 200mL of water until homogeneous, then add 0.7mg of dopamine, stir openly for 24h, filter, dry and put into a beaker, add 300g of water and mix until homogeneous, then add 5g of aniline, and adjust the pH to 4 with 20wt% HCl, react for 3h at 3℃, centrifuge and dry after the reaction is complete to obtain toughening agent.

[0045] Comparative Example 1 The preparation method of the flame-retardant, high-impact PP composite material in this comparative example is as follows: 1) Weigh 4 kg of polypropylene resin 1250, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Youbo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0046] Comparative Example 2 The preparation method of the flame-retardant, high-impact PP composite material in this comparative example is as follows: 1) Weigh 4 kg of polypropylene resin BH3310, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Youbo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and the die temperature is 200℃ to obtain PP flame retardant material. 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0047] Comparative Example 3 The preparation method of the flame-retardant, high-impact PP composite material in this comparative example is as follows: 1) Weigh 4.5 kg of polypropylene resin BH3820, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Yobo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main machine speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0048] Comparative Example 4 The preparation method of the flame-retardant, high-impact PP composite material in this comparative example is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer PP-MAH, 3.2 kg of flame retardant Yobo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent 6902, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0049] Comparative Example 5 The preparation method of the flame-retardant, high-impact PP composite material in this comparative example is as follows: 1) Weigh 4 kg of polypropylene resin BH3820, 0.5 kg of flow aid EA5076, 0.2 kg of compatibilizer YY-503A, 3.2 kg of flame retardant Yobo B-971, 1.3 kg of synergistic flame retardant I-138, 1 kg of impact agent POE, 20 g of antioxidant 3114, and 10 g of antioxidant 686 and put them into a high-speed mixer and mix evenly. After mixing evenly, add the mixture to the feeding system of a twin-screw extruder for melt extrusion granulation. The main extruder speed is 320 r / min, and the processing temperatures are: Zone 1 200℃, Zone 2 200℃, Zone 3 210℃, Zone 4 210℃, Zone 5 210℃, Zone 6 220℃, Zone 7 220℃, Zone 8 220℃, Zone 9 220℃, Zone 10 210℃, and die head 200℃ to obtain PP flame retardant material; 2) Take 4 kg of PP flame retardant material and 4 kg of EWR400 fiberglass cloth, press them into shape at a temperature of 220℃ and a pressure of 20MPa to obtain a flame retardant high impact PP composite material.

[0050] Performance testing 1. Density test standard for flame-retardant high-impact PP composite materials: ISO 1183-1.

[0051] 2. Tensile strength and elongation at break test standards for flame-retardant high-impact PP composite materials: ISO 527-4 / 5.

[0052] 3. Test standard for flexural strength and flexural modulus of flame-retardant high-impact PP composite materials: ISO 14125.

[0053] 4. Impact strength test standard for flame-retardant high-impact PP composite materials: ISO 179-1.

[0054] 5. Flame retardant performance test standard for flame retardant high-impact PP composite materials: UL94.

[0055] The test results of various properties of the flame-retardant high-impact PP composite material are shown in Tables 1 and 2 below.

[0056] Table 1. Test data of various properties of flame-retardant high-impact PP composite materials in Examples 1-7 Table 2. Test data of various properties of flame-retardant and high-impact PP composite materials of Comparative Examples 1-5 Analysis of Examples 1-6 and Comparative Examples 1-5, combined with Tables 1 and 2: Examples 1-6 show that the flame-retardant high-impact PP composite material obtained by this invention has superior tensile and flexural properties, with a notched impact strength > 170 kJ / m. 2Under unnotched conditions, the flame retardant performance was V0. Compared with Example 1, Comparative Examples 1 and 2 used low-impact-strength PP1250 (melt index: 25g / 10min, notched impact strength: 4J / m) and low-melt-index, high-impact-strength PP BH3310 (melt index: 4g / 10min). In Comparative Example 1, the lower impact strength of PP resulted in poor notched and unnotched strength of the composite material. In Comparative Example 2, although high-strength PP was used, its melt index was too low, resulting in the resin not being able to completely impregnate the fiberglass cloth, leading to a decrease in rigidity. In Comparative Example 3, no flow aid was used, resulting in poor resin impregnation of the fiberglass cloth, severe material delamination, and poor overall performance. Comparative Example 4 used PP grafted with MAH as a compatibilizer. The lactone functional group of MAH is not as good as that of compatibilizer YY-503A. It has organic functional groups with chelating ability and cannot effectively disperse brominated flame retardants or activate the surface of the synergist Sb2O3, resulting in poor flame retardant performance of the composite material. Furthermore, PP-MAH has poorer flowability than YY-503A, failing to effectively improve the melt index and resulting in poor overall material performance. Comparative Example 5 uses POE as a toughening agent, which is less compatible with the olefin-based elastomer and the PP substrate, leading to poorer overall performance.

[0057] Analysis of Examples 1-7 and Table 1 shows that, compared to Example 1, the addition of toughening agent in Example 7 further improves the impact resistance, tensile strength, and flexural strength of the flame-retardant high-impact PP composite material. This is because the internal double-layer magnesium aluminum hydroxide of the toughening agent and the external polyaniline form a core-shell structure with good toughness. This complementary structure of "rigid core-elastic shell" enables the toughening agent to simultaneously achieve a significant improvement in the plastic's impact resistance and fracture toughness, as well as a balanced optimization of tensile strength and elongation at break.

[0058] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A flame-retardant, high-impact PP composite material, characterized in that: Including flame-retardant PP materials and fiberglass cloth; The PP flame retardant material comprises the following components in parts by weight: 40-50 parts of polyolefin resin, 5-7 parts of flow aid, 2-3 parts of compatibilizer, 25-35 parts of flame retardant, 8-15 parts of synergistic flame retardant, 5-10 parts of impact agent, and 0.2-0.5 parts of antioxidant.

2. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The fiberglass cloth is a non-twisted roving woven fabric.

3. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The impact strength of the polyolefin resin is >100 J / m.

4. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The flow aid is a PP flow aid with a melt flow rate ≥100g / 10min (230℃, 2.16kg).

5. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The compatibilizer is a polymer material grafted with organic functional groups that have chelating ability.

6. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The flame retardant is a brominated flame retardant; And / or, the synergistic flame retardant is an antimony-based synergistic flame retardant.

7. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The impact-resistant agent is an olefin-based elastomer; And / or, the antioxidant is one or more of hindered phenolic antioxidants, phosphate ester antioxidants and thiolated antioxidants.

8. The flame-retardant, high-impact PP composite material according to claim 1, characterized in that: The PP flame-retardant material further includes a toughening agent; the preparation method of the toughening agent includes the following steps: S1: In an alkaline environment, a double-layer magnesium aluminum hydroxide was prepared using magnesium chloride hexahydrate and aluminum chloride hexahydrate; S2: A toughening agent is obtained by sequentially coating a double layer of magnesium aluminum hydroxide with polydopamine and polyaniline.

9. A flame-retardant, high-impact PP composite material according to claim 1 or 2, characterized in that: The fiberglass cloth is a plain weave fabric made of untwisted roving woven on a checkered cloth loom, with a weight of 400-600 g / cm³. 2 .

10. The method for preparing a flame-retardant, high-impact PP composite material as described in claim 1, characterized in that: The steps include the following: 1) Mix polyolefin resin, flow aid, compatibilizer, flame retardant, synergistic flame retardant, impact agent, and antioxidant, and then melt extrude and granulate to obtain PP flame retardant material; 2) Take PP flame-retardant material and fiberglass cloth in a mass ratio of 4-6:6-4, press them into shape, and obtain flame-retardant high-impact PP composite material; The process parameters for melt extrusion granulation are: main machine speed 300-500 r / min, and processing temperature of each zone 200-220℃; The pressing temperature is 200-220℃ and the pressure is 20-30MPa.

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