A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G

Abstract

The present invention provides a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising polypropylene resin, toughening modified resin, LFT polypropylene long glass fiber masterbatch, halogen-free flame retardant, hollow micropowder, coupling agent containing reactive groups, compatibilizer, antioxidant, lubricant, and weathering agent. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G obtained by the present invention has the advantages of environmental protection, good flame retardant effect, and low dielectric constant, and has the characteristics of excellent mechanical properties and heat resistance. The flame retardant grade can reach UL94V2~V0 level, the dielectric constant is less than 2.3, and the dielectric loss is less than 2.0×10 ‑3 .

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G. Background Art

[0002] 5G refers to the fifth generation of mobile communication technology, which has the characteristics of high data rate, reduced latency, energy and cost saving, increased system capacity and large-scale device connection. However, its biggest disadvantage is poor signal penetration and large attenuation. Therefore, 5G requires the dielectric constant and dielectric loss of the propagation medium material to be low.

[0003] Compared with inorganic non-metallic materials, polymer materials have the advantages of low dielectric constant, light weight and low price, especially polyolefin materials, which have better performance. However, 5G communication still faces the following problems: first, the high frequency of 5G signals causes serious heating of components, which puts forward requirements for the heat resistance and flame retardancy of materials; second, the use environment of 5G communication is complex, so the mechanical properties of materials must meet the changing environment.

[0004] In order to meet the requirements of 5G for flame retardancy and heat resistance, under the premise of environmental protection, halogen-free flame retardant has become the first choice to improve the heat resistance and flame retardancy of materials. This type of flame retardant has the advantages of low smoke, non-volatile during combustion, and no corrosive gas, which can effectively avoid pollution to the environment. However, halogen-free flame retardant contains a large number of polar groups, which not only lead to poor compatibility with polypropylene materials, but also cause polarization, which has a great impact on the dielectric constant and dielectric loss of the material; at the same time, in order to meet the complex use environment of 5G materials, the industry generally adopts various fillers to improve mechanical properties, and commonly used ones are calcium carbonate, talcum powder, mica, glass fiber, etc.

[0005] The document with application number CN112679855A provides a low-density, low-dielectric, high-heat-resistant, flame-retardant polypropylene composite material for 5G and its preparation method. The high-efficiency phosphorus-based flame retardant plays a gas phase and condensed phase flame retardant role during the combustion process, but the mechanical properties of the material are poor and cannot meet the conditions for outdoor use. The document with application number CN109206751A discloses a weather-resistant, flame-retardant polypropylene modified material for antenna cover and its preparation method. Electronic grade glass fiber and low dielectric filler are added to the polypropylene matrix to modify the polypropylene. The electronic grade glass fiber and low dielectric filler are easily dispersed in the polypropylene matrix to achieve the purpose of improving the mechanical properties of the material and reducing the dielectric properties of the material, meeting the application requirements of outdoor antenna covers; however, the dielectric properties of the material are in a relatively low state, and the material contains a large amount of halogen, which does not meet the current RoHS and Reach standards. At present, patents are focused on achieving the purpose of low dielectric by adding new low dielectric additives, and there is relatively little research on how to treat the original additives to improve their dielectric properties. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, which includes polypropylene resin, toughening modified resin, LFT polypropylene long glass fiber masterbatch, halogen-free flame retardant, hollow micropowder, coupling agent containing reactive groups, compatibilizer, antioxidant, lubricant, and weathering agent. By rationally using the above-mentioned components, the halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G obtained by the present invention has the advantages of environmental protection, good flame retardant effect, and low dielectric constant, and has the characteristics of excellent mechanical properties and heat resistance. The flame retardant grade can reach UL94V2~V0 level, the dielectric constant is less than 2.3, and the dielectric loss is less than 2.0×10 -3 .

[0007] The technical solution of the present invention is as follows:

[0008] A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising the following components by weight: 30-50 parts of polypropylene resin, 10-40 parts of toughening modified resin, 10-50 parts of LFT polypropylene long glass fiber masterbatch, 30-60 parts of halogen-free flame retardant, 1-10 parts of hollow micropowder, 0-5 parts of coupling agent containing reactive groups, 1-5 parts of compatibilizer, 0.2-0.5 parts of antioxidant, 0.1-0.5 parts of lubricant, and 0.1-1 parts of weathering agent.

[0009] Preferably, the polypropylene resin comprises at least one of a homopolymer polypropylene resin and a copolymer polypropylene resin; the melt flow rate of the polypropylene resin measured under the conditions of 230 and 2.16 kg is 0.5-100 g / 10 min; the dielectric constant of the polypropylene resin is ≤2.3, and the dielectric loss is ≤0.2×10.

[0010] Preferably, the toughening modified resin is one or a mixture of two of ethylene-octene copolymer, ethylene-butene copolymer and styrene block copolymer; the melt flow rate of the toughening modified resin measured at 230°C and 2.16kg is 0.5-2.0g / 10min.

[0011] Preferably, the matrix of the LFT polypropylene long glass fiber masterbatch is polypropylene, the content of the glass fiber masterbatch is 30-50%, and the fiber diameter of the glass fiber masterbatch is 12-18 μm.

[0012] Preferably, in the LFT polypropylene long glass fiber masterbatch, the melt flow rate of polypropylene measured at 230° C. and 2.16 kg is 90-100 g / 10 min; the content of the glass fiber masterbatch is 50%, and the fiber diameter of the glass fiber masterbatch is 14 μm.

[0013] Preferably, the halogen-free flame retardant is one or more of DOPO derivatives, ammonium polyphosphate, expanded graphite, melamine phosphate, zinc borate, TGIC, aluminum hydroxide, magnesium hydroxide, etc.; the above-mentioned halogen-free flame retardant not only does not contain halogen toxic components, but also has lower cost, is economical and environmentally friendly; this type of flame retardant has a high phosphorus content, the residual carbon rate is correspondingly increased, and the flame retardant effect is good.

[0014] Preferably, the hollow micropowder is at least one of organic or inorganic micropowders having a hollow structure.

[0015] Preferably, the hollow micropowder is at least one of hollow glass microbeads, hollow ceramic microbeads, POSS, molecular sieves, and zeolites.

[0016] Preferably, the compatibilizer is at least one of PP-g-MAH, POE-g-MAH, PP-GA, and EAA; the compatibilizer can effectively modify the polypropylene resin, and while improving the compatibility and dispersibility of each component in the material, it can also enhance the mechanical properties of the polypropylene material; the coupling agent containing a reactive group is at least one of a silane coupling agent, a borate coupling agent, and an aluminate coupling agent; the reactive group is one or more of an amino group, a hydroxyl group, a carboxyl group, and an epoxy group.

[0017] Preferably, the antioxidant is at least one of a hindered phenol antioxidant, a hindered amine antioxidant, a phosphate antioxidant, and a thioester antioxidant.

[0018] Preferably, the antioxidant consists of a hindered amine antioxidant 1010 and a phosphite antioxidant 168, and the mass ratio of the hindered amine antioxidant 1010 to the phosphite antioxidant 168 is 1:2.

[0019] Preferably, the lubricant includes at least one of EBS and silicone powder; the weathering agent includes at least one of UV326, UV3808, UV944, and FS-200; the lubricant can effectively improve the fluidity of the polypropylene resin during the early extrusion process and reduce the friction of the flow process during the plasticization process; it can also effectively demold the product in the later stage for easy use; the addition of the weathering agent can effectively improve the stability of the performance of the prepared product and the durability of the product, so that the product can be effectively used for a long time in a variety of environments.

[0020] The preparation method of the 5G halogen-free flame-retardant glass fiber reinforced polypropylene composite material is as follows:

[0021] (1) Weighing materials: weigh 30-50 parts of polypropylene resin, 10-40 parts of toughening modified resin, 10-50 parts of LFT polypropylene long glass fiber masterbatch, 30-60 parts of halogen-free flame retardant, 1-10 parts of hollow micropowder, 0-5 parts of coupling agent containing reactive groups, 1-5 parts of compatibilizer, 0.2-0.5 parts of composite antioxidant, 0.1-0.5 parts of lubricant, and 0.1-1 parts of weathering agent according to weight;

[0022] (2) Modification of the halogen-free flame retardant: Add the weighed coupling agent containing reactive groups and the halogen-free flame retardant in step (1) into a high-speed mixer at a speed of 500-1500 r / min, and mix at 60-100° C. for 1-5 min to obtain a modified flame retardant;

[0023] (3) Preparation of functional masterbatch:

[0024] Add modified flame retardant, polypropylene resin, toughened modified resin, hollow micropowder, composite antioxidant, compatibilizer, lubricant and weathering agent into a high-speed mixer with a rotation speed of 500-1500 r / min, mix for 1-5 min, and then add into a twin-screw extruder for extrusion to obtain a functional masterbatch;

[0025] The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 160-200°C in the die;

[0026] (4) Add the functional masterbatch and LFT polypropylene long glass fiber masterbatch into a high-speed mixer with a rotation speed of 500-1500 r / min, and mix for 1-5 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G; the material has the advantages of low dielectric and low loss.

[0027] In the present invention, by adding modified flame retardant, LFT polypropylene long glass fiber masterbatch and hollow micropowder into polypropylene resin, the mechanical properties of the product can be guaranteed and the dielectric constant and dielectric loss of the product can be reduced under the premise of environmental protection and no pollution; wherein, the modified flame retardant obtained by treating the halogen-free flame retardant with a coupling agent can not only play a gas phase and condensed phase flame retardant role in the combustion process, but also can ensure that the compatibilizer is grafted on the surface of the flame retardant, improve compatibility, and reduce the interface polarization generated by the flame retardant; the hollow micropowder has a hollow structure, and a large porosity can play a good role in reducing weight and reducing material density, thereby reducing the dielectric constant of the material, and the hollow structure also has a good heat insulation effect, and the hollow micropowder can play a role of a certain nucleating agent, thereby improving the heat resistance of the material, and also significantly improving the heat deformation temperature and flame retardancy of the material. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G of the present invention has the advantages of environmental protection, good flame retardant effect, low dielectric constant, excellent mechanical properties and heat resistance, and the flame retardant grade can reach UL94V2~V0 level, the dielectric constant is less than 2.3, and the dielectric loss is less than 2.0×10 -3 .

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. In the present invention, the dispersibility of the flame retardant and the polypropylene resin matrix is ​​improved by a surface modification method and a chemical grafting reaction; this technical method effectively improves the dispersibility of the flame retardant in the resin, and through the covalent bond and hydrogen bond between the flame retardant and the hollow micropowder, improves the synergistic effect between different fillers, achieves excellent dispersion of the functional filler in the functional masterbatch, and effectively reduces the dielectric properties of the material.

[0030] 2. The present invention utilizes the method of functional masterbatch, firstly disperses the flame retardant, compatibilizer and hollow micropowder in polypropylene resin, and the functional masterbatch effectively improves the dispersion of fillers. Finally, by compounding and blending with LFT polypropylene long glass fiber masterbatch, the requirements for preparation equipment are low, and industrial large-scale production can be realized, which has more significant advantages compared with the existing technology.

[0031] 3. The polypropylene composite material provided by the present invention does not use halogen components. It has excellent mechanical properties and meets the low dielectric properties and flame retardant properties required by 5G antenna covers. The flame retardant grade of the material reaches UL94V2~V0, the dielectric constant is less than 2.3, and the dielectric loss is less than 2.0×10 -3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is the polypropylene composite material of the present invention.

[0034] Figure 2 The present invention is an injection molded part obtained by injection molding the polypropylene composite material. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] Unless otherwise specified, the raw materials used in the following specific examples are all commercially available common commodities.

[0037] Example 1

[0038] A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising the following components by weight:

[0039] 30kg polypropylene resin, 20kg toughening modified resin, 40kg LFT polypropylene long glass fiber masterbatch, 45kg halogen-free flame retardant, 0.3kg antioxidant, 0.2kg lubricant, 0.6kg weathering agent;

[0040] The polypropylene resin is polypropylene resin 9829H;

[0041] The toughening modified resins are POE8842 and POE8137, with a ratio of 1:1;

[0042] In the LFT polypropylene long glass fiber masterbatch, the melt flow rate of polypropylene measured at 230°C and 2.16kg is 100g / 10min, the content of glass fiber masterbatch is 50%, and the fiber diameter of glass fiber masterbatch is 17μm;

[0043] Halogen-free flame retardant is melamine phosphate; lubricant is silicone powder; weathering agent is FS-200;

[0044] The antioxidant is composed of 1010 parts of hindered amine antioxidant and 168 parts of phosphite antioxidant in a mass ratio of 1:2;

[0045] The preparation method of the above-mentioned polypropylene composite material is as follows:

[0046] (1) Weighing: Weigh each component according to weight and set aside;

[0047] (2) Preparation of functional masterbatch:

[0048] The halogen-free flame retardant, polypropylene resin toughening modified resin antioxidant, lubricant, and weathering agent were added into a high-speed mixer with a rotation speed of 500 r / min, mixed for 2 minutes, and then added into a twin-screw extruder for extrusion to obtain a functional masterbatch;

[0049] The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 200°C in the die;

[0050] (3) The functional masterbatch and LFT polypropylene long glass fiber masterbatch were added into a high-speed mixer with a rotation speed of 500-1500 r / min and mixed for 3 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G; the material has the advantages of low dielectric and low loss.

[0051] Example 2

[0052] A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising the following components by weight:

[0053] Polypropylene resin 50kg, LFT polypropylene long glass fiber masterbatch 40kg, halogen-free flame retardant 45kg, coupling agent containing reactive groups 2.5k, antioxidant 0.3kg, lubricant 0.2kg, weathering agent 0.6kg;

[0054] The polypropylene resin is polypropylene resin 9829H;

[0055] The toughening modified resins are POE8842 and POE8137, with a ratio of 1:1;

[0056] In the LFT polypropylene long glass fiber masterbatch, the melt flow rate of polypropylene measured at 230°C and 2.16kg is 100g / 10min, the glass fiber content is 50%, and the fiber diameter is 17μm;

[0057] The compatibilizer is PP-g-MAH; the coupling agent is silane coupling agent KH550;

[0058] Halogen-free flame retardant is melamine phosphate; lubricant is silicone powder; weathering agent is FS-200;

[0059] The antioxidant is composed of 1010 parts of hindered amine antioxidant and 168 parts of phosphite antioxidant in a mass ratio of 1:2;

[0060] The preparation method of the above-mentioned polypropylene composite material is as follows:

[0061] (1) Weighing: Weigh each component according to weight and set aside;

[0062] (2) Modification of halogen-free flame retardant: Add the coupling agent containing reactive groups and halogen-free flame retardant weighed in step (1) into a high-speed mixer at a speed of 1000 r / min, and mix at 80° C. for 5 min to obtain a modified flame retardant;

[0063] (3) Preparation of functional masterbatch:

[0064] Add the modified flame retardant, the polypropylene resin toughened modified resin antioxidant, the lubricant, and the weathering agent into a high-speed mixer with a rotation speed of 500 r / min, mix for 2min, and then add the mixture into a twin-screw extruder for extrusion to obtain a functional masterbatch;

[0065] The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 200°C in the die;

[0066] (4) The functional masterbatch and LFT polypropylene long glass fiber masterbatch were added into a high-speed mixer with a rotation speed of 1200 r / min and mixed for 5 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G; the material has the advantages of low dielectric and low loss.

[0067] Example 3

[0068] A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising the following components by weight:

[0069] 30kg polypropylene resin, 20kg toughening modified resin, 40kg LFT polypropylene long glass fiber masterbatch, 45kg halogen-free flame retardant, 2.5kg coupling agent containing reactive groups, 2kg compatibilizer, 0.3kg antioxidant, 0.2kg lubricant, 0.6kg weathering agent;

[0070] The polypropylene resin is polypropylene resin 9829H; the toughening and modifying resins are POE8842 and POE8137, and the ratio of the two is 1:1;

[0071] In the LFT polypropylene long glass fiber masterbatch, the melt flow rate of polypropylene measured at 230°C and 2.16kg is 100g / 10min, the content of glass fiber masterbatch is 50%, and the fiber diameter of glass fiber masterbatch is 17μm;

[0072] The compatibilizer is PP-g-MAH; the coupling agent is silane coupling agent KH550; the halogen-free flame retardant is melamine phosphate; the lubricant is silicone powder; the weathering agent is FS-200;

[0073] The antioxidant is composed of 1010 parts of hindered amine antioxidant and 168 parts of phosphite antioxidant in a mass ratio of 1:2;

[0074] The preparation method of the above-mentioned polypropylene composite material is as follows:

[0075] (1) Weighing: Weigh each component according to weight and set aside;

[0076] (2) Modification of halogen-free flame retardant: Add the coupling agent containing reactive groups and halogen-free flame retardant weighed in step (1) into a high-speed mixer at a speed of 500 r / min, and mix at 80° C. for 5 min to obtain a modified flame retardant;

[0077] (3) Preparation of functional masterbatch:

[0078] Add modified flame retardant, polypropylene resin, toughened modified resin, antioxidant, compatibilizer, lubricant and weathering agent into a high-speed mixer with a rotation speed of 500 r / min, mix for 2 minutes, and then add into a twin-screw extruder for extrusion to obtain a functional masterbatch;

[0079] The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 200°C in the die;

[0080] (4) Add the functional masterbatch and LFT polypropylene long glass fiber masterbatch into a high-speed mixer with a rotation speed of 500-1500 r / min, and mix for 1-5 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G; the material has the advantages of low dielectric and low loss.

[0081] Example 4

[0082] A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, comprising the following components by weight:

[0083] 30kg polypropylene resin, 20kg toughening modified resin, 40kg LFT polypropylene long glass fiber masterbatch, 45kg halogen-free flame retardant, 25kg hollow micro powder, 2.5kg coupling agent containing reactive groups, 2kg compatibilizer, 0.3kg antioxidant, 0.2kg lubricant, 0.6kg weathering agent;

[0084] The toughening modified resins are POE8842 and POE8137, with a ratio of 1:1;

[0085] In the LFT polypropylene long glass fiber masterbatch, the melt flow rate of polypropylene measured at 230°C and 2.16kg is 100g / 10min, the content of glass fiber masterbatch is 50%, and the fiber diameter of glass fiber masterbatch is 17μm;

[0086] The compatibilizer is PP-g-MAH; the coupling agent is silane coupling agent KH550;

[0087] Halogen-free flame retardant is melamine phosphate; lubricant is silicone powder; hollow micropowder is hollow glass microsphere; weathering agent is FS-200;

[0088] The antioxidant is composed of 1010 parts of hindered amine antioxidant and 168 parts of phosphite antioxidant in a mass ratio of 1:2;

[0089] The preparation method of the above-mentioned polypropylene composite material is as follows:

[0090] (1) Weighing: Weigh each component according to weight and set aside;

[0091] (2) Modification of halogen-free flame retardant: Add a coupling agent containing a reactive group and a halogen-free flame retardant into a high-speed mixer at a rotation speed of 500 r / min, and mix at 80° C. for 5 min to obtain a modified flame retardant;

[0092] (3) Preparation of functional masterbatch:

[0093] Add modified flame retardant, polypropylene resin, toughened modified resin, LFT polypropylene long glass fiber masterbatch, hollow micropowder, antioxidant, compatibilizer, lubricant and weathering agent into a high-speed mixer with a rotation speed of 500 r / min, mix for 2 minutes, and then add into a twin-screw extruder for extrusion to obtain a functional masterbatch;

[0094] The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 200°C in the die;

[0095] (4) Add the functional masterbatch and LFT polypropylene long glass fiber masterbatch into a high-speed mixer with a rotation speed of 500-1500 r / min, and mix for 1-5 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G; the material has the advantages of low dielectric and low loss.

[0096] Example 5

[0097] The only difference between this embodiment and embodiment 4 is that in the LFT polypropylene long glass fiber masterbatch, the fiber diameter of the glass fiber masterbatch is 14 μm.

[0098] Comparative Example 1

[0099] The only difference between this comparative example and Example 4 is that the coupling agent is rare earth coupling agent AG-1.

[0100] Comparative Example 2

[0101] The only difference between this comparative example and Example 4 is that in this comparative example, the compatibilizer is PP-GAM.

[0102] Comparative Example 3

[0103] The only difference between this comparative example and Example 4 is that in this comparative example, the toughening and modifying resins are POE8842 and SEBSYH503.

[0104] Comparative Example 4

[0105] In this comparative example, the data in the table are the properties of polypropylene resin K9829H.

[0106] Comparative Example 5

[0107] In this comparative example, the data in the table are the performance of LFT polypropylene long glass fiber products, in which the glass fiber content is 20%.

[0108] The materials of Examples 1-5 and Comparative Examples 1-5 were tested, and the results are shown in Table 1.

[0109] Table 1 Test results

[0110]

[0111]

[0112] It can be seen from Table 1 that the halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G prepared in Example 5 of the present invention has excellent mechanical properties, low dielectric constant and dielectric loss, high heat deformation temperature, and excellent flame retardant effect compared with the polypropylene materials obtained in other embodiments and comparative examples.

[0113] Although the present invention has been described in detail by reference to the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G, characterized in that: The composition includes the following components by weight: 30-50 parts of polypropylene resin, 10-40 parts of toughening modified resin, 10-50 parts of LFT polypropylene long glass fiber masterbatch, 30-60 parts of halogen-free flame retardant, 1-10 parts of hollow micropowder, 0-5 parts of coupling agent containing reactive groups, 1-5 parts of compatibilizer, 0.2-0.5 parts of antioxidant, 0.1-0.5 parts of lubricant and 0.1-1 parts of weathering agent; The toughening modified resin is one or a mixture of two of ethylene-octene copolymer, ethylene-butene copolymer and styrene block copolymer; the melt flow rate of the toughening modified resin measured at 230° C. and 2.16 kg is 0.5-2.0 g / 10 min; The matrix of the LFT polypropylene long glass fiber masterbatch is polypropylene, the content of the glass fiber masterbatch is 30-50%, and the fiber diameter of the glass fiber masterbatch is 12-18 μm; the melt flow rate of polypropylene measured at 230° C. and 2.16 kg is 90-100 g / 10 min; The halogen-free flame retardant is melamine phosphate; The compatibilizer is at least one of PP-g-MAH, POE-g-MAH, PP-GA, and EAA; the coupling agent containing a reactive group is at least one of a silane coupling agent, a borate coupling agent, and an aluminate coupling agent.

2. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to claim 1, characterized in that: The polypropylene resin comprises at least one of a homopolymer polypropylene resin and a copolymer polypropylene resin; the melt flow rate of the polypropylene resin measured at 230° C. and 2.16 kg is 0.5-100 g / 10 min; the dielectric constant of the polypropylene resin is ≤2.3, and the dielectric loss is ≤0.2×10 -4 .

3. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to claim 1, characterized in that: The hollow micropowder is at least one of organic or inorganic micropowders having a hollow structure.

4. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to claim 3, characterized in that: The hollow micropowder is at least one of hollow glass microbeads, hollow ceramic microbeads, POSS, and molecular sieves.

5. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to claim 1, characterized in that: The antioxidant is at least one of hindered phenol antioxidants, hindered amine antioxidants, phosphate antioxidants, and thioester antioxidants; the lubricant includes at least one of EBS and silicone powder; the weathering agent includes at least one of UV326, UV3808, UV944, and FS-200.

6. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to claim 5, characterized in that: The antioxidant consists of a hindered amine antioxidant 1010 and a phosphite antioxidant 168, and the mass ratio of the hindered amine antioxidant 1010 to the phosphite antioxidant 168 is 1:

2.

7. The halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G according to any one of claims 1 to 6, characterized in that: The preparation method is as follows: (1) Weighing materials: weigh 30-50 parts of polypropylene resin, 10-40 parts of toughening modified resin, 10-50 parts of LFT polypropylene long glass fiber masterbatch, 30-60 parts of halogen-free flame retardant, 1-10 parts of hollow micropowder, 0-5 parts of coupling agent containing reactive groups, 1-5 parts of compatibilizer, 0.2-0.5 parts of composite antioxidant, 0.1-0.5 parts of lubricant, and 0.1-1 parts of weathering agent according to weight; (2) Modification of halogen-free flame retardant: Add the weighed coupling agent containing reactive groups and halogen-free flame retardant in step (1) into a high-speed mixer with a rotation speed of 500-1500 r / min, and mix at 60-100° C. for 1-5 minutes to obtain a modified flame retardant; (3) Preparation of functional masterbatch: Add modified flame retardant, polypropylene resin, toughened modified resin, hollow micropowder, composite antioxidant, compatibilizer, lubricant and weathering agent into a high-speed mixer with a rotation speed of 500-1500 r / min, mix for 1-5 minutes, and then add into a twin-screw extruder for extrusion to obtain a functional masterbatch; The temperature of the twin-screw extruder is set to 100-160°C in the feeding zone, 130-190°C in the compression zone, 130-190°C in the homogenization zone, and 160-200°C in the die; (4) Add the functional masterbatch and LFT polypropylene long glass fiber masterbatch into a high-speed mixer with a rotation speed of 500-1500 r / min and mix for 1-5 minutes to obtain a halogen-free flame-retardant glass fiber reinforced polypropylene composite material for 5G.

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