Environment-friendly flame-retardant long glass fiber reinforced polypropylene material as well as preparation method and application thereof

Abstract

The invention provides an environment-friendly flame-retardant long glass fiber reinforced polypropylene material which comprises the following components in percentage by mass: 65-80% of polypropylene, 20-45% of long glass fiber, 0.1-2% of a glass fiber compatilizer, 0.1-1% of a heat stabilizer, 0.1-0.5% of a lubricant, 0.1-0.5% of an ultraviolet light absorber, 1-15% of hollow glass beads and 5-20% of an environment-friendly flame retardant. The invention also provides a preparation method and application of the environment-friendly flame-retardant long glass fiber reinforced polypropylene material. The environment-friendly flame-retardant long glass fiber reinforced polypropylene material provided by the invention is environment-friendly, flame-retardant, high in mechanical strength, good in dimensional stability, strong in weather resistance and light in weight, the preparation method is simple, and the process conditions are easy to control.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material and a preparation method and application thereof. Background Art

[0002] Long glass fiber reinforced thermoplastics are a type of high-performance composite material that has developed rapidly in recent years. They are composed of a thermoplastic resin matrix, continuous reinforcing fibers, and some additives. The continuous fibers and resin are compounded in the impregnation head, and the resin is evenly distributed between the fibers to form a continuous phase to fix the spatial position of the fibers and transfer the load inside the material. The fibers in long fiber reinforced composite materials are continuous and parallel, the fibers and particles are the same length, and are well coated and impregnated with plastic, so that products with excellent mechanical properties can be manufactured. Its most prominent advantages are high stiffness and strength, excellent heat resistance, creep resistance, dimensional stability, and long service life.

[0003] Although the mechanical properties of long glass fiber reinforced polypropylene materials are comparable to those of engineering plastics, due to its complex coating and impregnation production process, it is difficult to modify the functionality of this material in some directions. For example, in terms of improving flame retardancy, the direct addition of flame retardants will affect the wetting effect and thus cause fluctuations in the mechanical properties of the material. At the same time, the amount of flame retardant added in the coating and impregnation production process is uncontrollable, which will make the flame retardant effect unsatisfactory.

[0004] At the same time, since the specific gravity of the polypropylene composite material with continuous long glass fiber produced by the coating and impregnation production process is significantly higher than that of the polypropylene material, after the product is prepared, not only is the weight likely to exceed the standard, but it will also lead to an increase in cost.

[0005] Therefore, it is a problem that needs to be solved at present to develop an environmentally friendly flame retardant long glass fiber reinforced polypropylene material that is environmentally friendly, flame retardant, has high mechanical strength, good dimensional stability, strong weather resistance and lightweight, and to provide a preparation method for an environmentally friendly flame retardant long glass fiber reinforced polypropylene material with a simple preparation method and easy-to-control process conditions. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an environmentally friendly flame retardant long glass fiber reinforced polypropylene material which has high mechanical strength, good dimensional stability, strong weather resistance and lightweight, and to provide a preparation method of the environmentally friendly flame retardant long glass fiber reinforced polypropylene material which has a simple preparation method and easily controllable process conditions.

[0007] In order to solve the above technical problems, the present invention provides an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, whose components and proportions, by mass percentage, are: 65-80% polypropylene, 20-45% long glass fiber, 0.1-2% glass fiber compatibilizer, 0.1-1% heat stabilizer, 0.1-0.5% lubricant, 0.1-0.5% ultraviolet absorber, 1-15% hollow glass microspheres, and 5-20% environmentally friendly flame retardant.

[0008] Furthermore, the polypropylene is an ultra-high fluidity polypropylene with a melt flow rate between 50 and 500 g / 10 min.

[0009] Furthermore, the long glass fiber is an alkali-free continuous high-strength long glass fiber.

[0010] Furthermore, the glass fiber compatibilizer comprises at least one polar monomer grafted polymer, the polymer matrix is ​​one or more of polyethylene, polypropylene, ethylene-α-ethylene-octene copolymer, copolymer of styrene and butadiene, polyethylene-polystyrene-polypropylene terpolymer, ethylene-propylene-butadiene terpolymer, ethylene-acrylate copolymer and ethylene-acrylate-glycidyl methacrylate copolymer, and the polar monomer is maleic anhydride, maleic anhydride analogues, acrylic acid or acrylic acid ester derivatives.

[0011] Furthermore, the heat stabilizer is one or more of a phenol heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenol heat stabilizer, a composite heat stabilizer of an acryloyl functional group and a thioester, and a calixarene heat stabilizer.

[0012] Furthermore, the lubricant is one or more of a metal soap lubricant, a low molecular weight ester lubricant, a stearic acid complex ester lubricant and an amide lubricant.

[0013] Furthermore, the ultraviolet absorber is one or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole, and monobenzoic acid resorcinol ester.

[0014] Furthermore, the environmentally friendly flame retardant is one or more of an inorganic flame retardant, a phosphorus-based flame retardant, a nitrogen-based flame retardant and a silicon oxide-based flame retardant.

[0015] Furthermore, the density of the hollow glass microspheres is 0.15-0.6 kg / m 3The particle size is 120-2000 meshes. The hollow glass microspheres are dispersed in a dispersant and subjected to coupling treatment using a coupling agent. The coupling agent is one or more of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.

[0016] The present invention also provides a method for preparing an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, comprising the following steps:

[0017] Add the polypropylene, glass fiber compatibilizer, heat stabilizer, lubricant and ultraviolet absorber into a high-speed mixer in order according to the proportions and mix to obtain a polypropylene resin mixture;

[0018] Adding the polypropylene resin mixture into an extruder and extruding it into an impregnation device connected to the extruder head to obtain a molten polypropylene resin mixture;

[0019] Drawing the long glass fibers into an impregnation device so that the content of the long glass fibers in the polypropylene resin mixture is 10-50%;

[0020] Long glass fibers are impregnated and dispersed in a molten polypropylene resin mixture to obtain a long glass fiber polypropylene material;

[0021] The long glass fiber polypropylene material is cooled and granulated to obtain long glass fiber reinforced polypropylene granules;

[0022] The polypropylene, glass fiber compatibilizer, heat stabilizer, lubricant, ultraviolet absorber, hollow glass microspheres and environmentally friendly flame retardant are mixed in a high-speed mixer according to a proportion to obtain a mixture;

[0023] The mixed material is fed into an extruder, and after extrusion, water-cooled and granulated to obtain polypropylene low-density flame-retardant foaming masterbatch;

[0024] The long glass reinforced polypropylene particles are mixed with the polypropylene low-density flame-retardant foaming masterbatch to form an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material.

[0025] Furthermore, the impregnation equipment is an impregnation equipment for continuous fiber reinforced thermoplastic material, and the temperature of the impregnation equipment is 200°C-250°C.

[0026] Furthermore, the extruder is a twin-screw extruder, the screw diameter is 63 mm, the screw aspect ratio is 40:1, the mixing and melting temperature is set to 190°C, and the die temperature is set to 200°C.

[0027] Furthermore, when the long glass fibers are drawn into the impregnation device, the content of the long glass fibers in the polypropylene resin mixture is controlled to be 10-50% by selecting the size of the shaping die, and the size of the shaping die is 4 mm.

[0028] Furthermore, the temperature of the high-speed mixer is set to 40-60° C., and the mixing time is 3-8 minutes; and the granulation is performed by cutting the granules into granules with a length of 0.8-1.2 cm using a granulator.

[0029] The invention provides an application of an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material. The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material prepared by the above method is used to manufacture housings of electronic and electrical products.

[0030] The present invention provides an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, which uses polypropylene with an ultra-high melt flow rate as a matrix, combined with long glass fibers, environmentally friendly flame retardants and hollow glass microspheres to form a long glass fiber reinforced polypropylene material, which not only has environmentally friendly flame-retardant properties, but also has the characteristics of high mechanical strength, good dimensional stability, strong weather resistance and lightweight. The present invention provides a method for preparing an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, which separately prepares long glass fiber polypropylene particles and polypropylene environmentally friendly low-density flame-retardant masterbatch, and then mixes the two evenly, and directly hot presses or injection molds them to obtain the obtained material. Not only is the preparation method simple, but the process conditions are also easy to control. The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material prepared by the present invention has the characteristics of environmentally friendly flame retardancy, high mechanical strength, good dimensional stability, strong weather resistance and lightweight, and is suitable for injection molding of thin-walled large parts and electrical housing products with complex structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a method for preparing an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The embodiment of the present invention provides an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, whose components and proportions, measured by mass percentage, are: 65-80% polypropylene, 20-45% long glass fiber, 0.1-2% glass fiber compatibilizer, 0.1-1% heat stabilizer, 0.1-0.5% lubricant, 0.1-0.5% ultraviolet absorber, 1-15% hollow glass microspheres, and 5-20% environmentally friendly flame retardant.

[0033] Wherein, the polypropylene is ultra-high fluidity polypropylene with a melt flow rate between 50 and 500 g / 10 min.

[0034] Wherein, the long glass fiber is an alkali-free continuous high-strength long glass fiber.

[0035] Wherein, the glass fiber compatibilizer comprises at least one polar monomer grafted polymer, the polymer matrix is ​​one or more of polyethylene, polypropylene, ethylene-α-ethylene-octene copolymer, copolymer of styrene and butadiene, polyethylene-polystyrene-polypropylene terpolymer, ethylene-propylene-butadiene terpolymer, ethylene-acrylate copolymer and ethylene-acrylate-glycidyl methacrylate copolymer, and the polar monomer is maleic anhydride, maleic anhydride analogues, acrylic acid or acrylate derivatives.

[0036] The heat stabilizer is one or more of a phenol heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenol heat stabilizer, a composite heat stabilizer of an acryloyl functional group and a thioester, and a calixarene heat stabilizer.

[0037] Wherein, the lubricant is one or more of metal soap lubricants, low molecular weight ester lubricants, stearic acid complex ester lubricants and amide lubricants.

[0038] Wherein, the ultraviolet absorber is one or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole, and monobenzoic acid resorcinol ester.

[0039] The environmentally friendly flame retardant is one or more of an inorganic flame retardant, a phosphorus flame retardant, a nitrogen flame retardant and a silicon oxide flame retardant.

[0040] The density of the hollow glass beads is 0.15-0.6 kg / m 3 The particle size is 120-2000 meshes. The hollow glass microspheres are dispersed in a dispersant and subjected to coupling treatment using a coupling agent. The coupling agent is one or more of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.

[0041] See also Figure 1 The present invention provides a method for preparing an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, comprising the following steps:

[0042] Step 1) In terms of mass percentage, 65-80% of polypropylene, 0.1-2% of glass fiber compatibilizer, 0.1-1% of heat stabilizer, 0.1-0.5% of lubricant and 0.1-0.5% of ultraviolet absorber are added to a high-speed mixer in sequence and mixed evenly to obtain a uniformly dispersed polypropylene resin mixture. In order to facilitate the mixing of these raw materials, the temperature of the high-speed mixer is set at 40-60° C., and the mixing time is controlled at 3-8 minutes.

[0043] Step 2) adding the uniformly dispersed polypropylene resin mixture into the hopper of the extruder, and then extruding the polypropylene resin mixture into the impregnation device connected to the extruder head.

[0044] The extruder is a twin-screw extruder with a screw diameter of 63 mm and a screw aspect ratio of 40:1. The mixed melting temperature is set at 190° C. and the die head temperature is set at 200° C. The polypropylene resin mixture added to the extruder hopper is converted into a molten polypropylene resin mixture at this high temperature.

[0045] Furthermore, since the impregnation device is an impregnation device for continuous fiber reinforced thermoplastic materials and the temperature of the impregnation device is controlled at 200° C.-250° C., the polypropylene resin mixture extruded into the impregnation device is still in a molten state.

[0046] Step 3) The long glass fibers are pulled into the impregnation device by a traction machine, and the content of the long glass fibers in the polypropylene resin mixture is controlled to be 10-50% by selecting the size of the shaping die, wherein the size of the selected shaping die is 4 mm.

[0047] Step 4) The long glass fibers are impregnated and dispersed in the molten polypropylene resin mixture, and the molten polypropylene resin mixture is impregnated and dispersed in the long glass fibers to obtain a long glass fiber polypropylene material.

[0048] Step 5) After cooling the long glass fiber polypropylene material by water cooling, the long glass fiber polypropylene material is cut into long glass fiber reinforced polypropylene particles with a length of 0.8-1.2 cm by a pelletizer.

[0049] Step 6) 65-80% of polypropylene, 0.1-2% of glass fiber compatibilizer, 0.1-1% of heat stabilizer, 0.1-0.5% of lubricant, 0.1-0.5% of ultraviolet absorber, 1-15% of hollow glass microspheres and 5-20% of environmentally friendly flame retardant are put into a high-speed mixer according to the proportion, mixed evenly, and dispersed evenly to obtain a mixture. In order to facilitate the mixing of these raw materials, the temperature of the high-speed mixer is set at 40-60° C., and the mixing time is controlled at 3-8 minutes.

[0050] Step 7) feeding the mixture into an extruder, wherein the extruder is a twin-screw extruder, the screw diameter is 63 mm, the aspect ratio of the screw is 40:1, the mixed melt temperature is set to 190° C., and the die temperature is set to 200° C. After the extruded molten mixture is cooled by water, the solidified mixture is cut into polypropylene low-density flame-retardant foaming masterbatch with a length of 0.8-1.2 cm by a pelletizer.

[0051] Step 8) long glass fiber reinforced polypropylene particles are mixed with polypropylene low-density flame-retardant foaming masterbatch, and then hot-pressed or injection-molded to obtain environmentally friendly flame-retardant long glass fiber reinforced polypropylene material.

[0052] The preparation method of the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material provided by the present invention is further described in detail below in conjunction with specific examples, but is not limited to these examples.

[0053] Example 1

[0054] (1) 97.8 parts of polypropylene, 1 part of glass fiber compatibilizer, 0.5 part of heat stabilizer, 0.5 part of lubricant, and 0.2 part of ultraviolet absorber were added to a high-speed mixer in sequence and mixed evenly to obtain a molten polypropylene resin mixture. The temperature of the high-speed mixer was set at 50° C. and the mixing time was 6 minutes.

[0055] (2) Add the molten polypropylene resin mixture in (1) into the hopper of the extruder, use the impregnation equipment of continuous fiber reinforced thermoplastic material, extrude the polypropylene resin mixture into the impregnation equipment connected to the extruder head, and then introduce the continuous glass fiber into the impregnation equipment through a tractor, and the glass fiber is impregnated and dispersed in the molten polypropylene resin mixture. The content of glass fiber in the composite material is adjusted by selecting the size of the qualitative die. The impregnated long glass fiber polypropylene material is pelletized to obtain granules with a length of about 1 cm. The mass ratio of polypropylene to long glass fiber in the composite material is 7:3.

[0056] (3) The long glass fiber reinforced polypropylene granules were injection molded into standard specimens, and various performance tests were performed. The results are shown in Table 1. The injection molded specimens were conditioned: the temperature was adjusted to 23±2° C., the humidity was 50%, and the conditioning time was 16 hours.

[0057] Example 2

[0058] (1) 97.8 parts of polypropylene, 1 part of glass fiber compatibilizer, 0.5 part of heat stabilizer, 0.5 part of lubricant, and 0.2 part of ultraviolet absorber were added to a high-speed mixer in sequence and mixed evenly to obtain a molten polypropylene resin mixture. The temperature of the high-speed mixer was set at 50° C. and the mixing time was 6 minutes.

[0059] (2) Add the molten polypropylene resin mixture in (1) into the hopper of the extruder, use the impregnation equipment of continuous fiber reinforced thermoplastic material, extrude the polypropylene resin mixture into the impregnation equipment connected to the extruder head, and then introduce the continuous glass fiber into the impregnation equipment through a tractor, and the glass fiber is impregnated and dispersed in the molten polypropylene resin mixture. The content of glass fiber in the composite material is adjusted by selecting the size of the qualitative die. The impregnated long glass fiber polypropylene material is pelletized to obtain granules with a length of about 1 cm. The mass ratio of polypropylene to long glass fiber in the composite material is 7:3.

[0060] (3) 20 parts of polypropylene, 0.2 parts of heat stabilizer, 0.2 parts of lubricant, 80 parts of environmentally friendly flame retardant and 0 parts of hollow glass microspheres are sequentially added into a mixer and mixed evenly, and then transferred into an extruder for granulation to obtain a low-density flame retardant masterbatch.

[0061] (4) (2) medium-long glass fiber reinforced polypropylene granules and (3) medium-low density flame retardant masterbatch were mixed uniformly in a ratio of 4:1 and injection molded into standard specimens, and various performance tests were performed. The results are shown in Table 1. The injection molded specimens were conditioned: the temperature was adjusted to 23±2°C, the humidity was 50%, and the conditioning time was 16 hours.

[0062] Example 3

[0063] (1) 97.8 parts of polypropylene, 1 part of glass fiber compatibilizer, 0.5 part of heat stabilizer, 0.5 part of lubricant, and 0.2 part of ultraviolet absorber were added to a high-speed mixer in sequence and mixed evenly to obtain a molten polypropylene resin mixture. The temperature of the high-speed mixer was set at 50° C. and the mixing time was 6 minutes.

[0064] (2) Add the molten polypropylene resin mixture in (1) into the hopper of the extruder, use the impregnation equipment of continuous fiber reinforced thermoplastic material, extrude the polypropylene resin mixture into the impregnation equipment connected to the extruder head, and then introduce the continuous glass fiber into the impregnation equipment through a tractor, and the glass fiber is impregnated and dispersed in the molten polypropylene resin mixture. The content of glass fiber in the composite material is adjusted by selecting the size of the qualitative die. The impregnated long glass fiber polypropylene material is pelletized to obtain granules with a length of about 1 cm. The mass ratio of polypropylene to long glass fiber in the composite material is 7:3.

[0065] (3) 16 parts of polypropylene, 0.2 parts of heat stabilizer, 0.2 parts of lubricant, 64 parts of environmentally friendly flame retardant and 16 parts of hollow glass microspheres are sequentially added into a mixer and mixed evenly, and then transferred into an extruder for granulation to obtain a low-density flame retardant masterbatch.

[0066] (4) (2) medium-long glass fiber reinforced polypropylene granules and (3) medium-low density flame retardant masterbatch were uniformly mixed in a ratio of 7:3 and injection molded into standard specimens, and various performance tests were performed. The results are shown in Table 1. The injection molded specimens were conditioned: the temperature was adjusted to 23±2°C, the humidity was 50%, and the conditioning time was 16 hours.

[0067] Example 4

[0068] (1) 97.8 parts of polypropylene, 1 part of glass fiber compatibilizer, 0.5 part of heat stabilizer, 0.5 part of lubricant, and 0.2 part of ultraviolet absorber were added to a high-speed mixer in sequence and mixed evenly to obtain a molten polypropylene resin mixture. The temperature of the high-speed mixer was set at 50° C. and the mixing time was 6 minutes.

[0069] (2) Add the molten polypropylene resin mixture in (1) into the hopper of the extruder, use the impregnation equipment of continuous fiber reinforced thermoplastic material, extrude the polypropylene resin mixture into the impregnation equipment connected to the extruder head, and then introduce the continuous glass fiber into the impregnation equipment through a tractor, and the glass fiber is impregnated and dispersed in the molten polypropylene resin mixture. The content of glass fiber in the composite material is adjusted by selecting the size of the qualitative die. The impregnated long glass fiber polypropylene material is pelletized to obtain granules with a length of about 1 cm. The mass ratio of polypropylene to long glass fiber in the composite material is 7:3.

[0070] (3) 12.5 parts of polypropylene, 0.2 parts of heat stabilizer, 0.2 parts of lubricant, 50 parts of environmentally friendly flame retardant and 37.5 parts of hollow glass microspheres are sequentially added into a mixer and mixed evenly, and then transferred into an extruder for granulation to obtain a low-density flame retardant masterbatch.

[0071] (4) (2) medium-long glass fiber reinforced polypropylene granules and (3) medium-low density flame retardant masterbatch were uniformly mixed in a ratio of 3:2 and injection molded into standard specimens, and various performance tests were performed. The results are shown in Table 1. The injection molded specimens were conditioned: the temperature was adjusted to 23±2°C, the humidity was 50%, and the conditioning time was 16 hours.

[0072] Example 5

[0073] (1) 97.8 parts of polypropylene, 1 part of glass fiber compatibilizer, 0.5 part of heat stabilizer, 0.5 part of lubricant, and 0.2 part of ultraviolet absorber were added to a high-speed mixer in sequence and mixed evenly to obtain a molten polypropylene resin mixture. The temperature of the high-speed mixer was set at 50° C. and the mixing time was 6 minutes.

[0074] (2) Add the molten polypropylene resin mixture in (1) into the hopper of the extruder, use the impregnation equipment of continuous fiber reinforced thermoplastic material, extrude the polypropylene resin mixture into the impregnation equipment connected to the extruder head, and then introduce the continuous glass fiber into the impregnation equipment through a tractor, and the glass fiber is impregnated and dispersed in the molten polypropylene resin mixture. The content of glass fiber in the composite material is adjusted by selecting the size of the qualitative die. The impregnated long glass fiber polypropylene material is pelletized to obtain granules with a length of about 1 cm. The mass ratio of polypropylene to long glass fiber in the composite material is 8:2.

[0075] (3) 12.5 parts of polypropylene, 0.2 parts of heat stabilizer, 0.2 parts of lubricant, 50 parts of environmentally friendly flame retardant and 37.5 parts of hollow glass microspheres are sequentially added into a mixer and mixed evenly, and then transferred into an extruder for granulation to obtain a low-density flame retardant masterbatch.

[0076] (4) (2) medium-long glass fiber reinforced polypropylene granules and (3) medium-low density flame retardant masterbatch were uniformly mixed in a ratio of 3:2 and injection molded into standard specimens, and various performance tests were performed. The results are shown in Table 1. The injection molded specimens were conditioned: the temperature was adjusted to 23±2°C, the humidity was 50%, and the conditioning time was 16 hours.

[0077] Table 1 Material performance test results

[0078]

[0079] It can be seen from Table 1 that when a certain amount of environmentally friendly flame retardant and hollow glass microspheres are added at the same time, the performance of the prepared material is significantly improved, especially the flame retardant and heat resistant properties of the prepared material are significantly improved, the density of the material is also reduced, and the lightweight of the material is achieved.

[0080] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, characterized in that: Calculated by mass percentage, its ingredients and proportions are: polypropylene 65-80%, long glass fiber 20-45%, glass fiber compatibilizer 0.1-2%, heat stabilizer 0.1-1%, lubricant 0.1-0.5%, UV absorber 0.1-0.5%, hollow glass microspheres 1-15%, and environmentally friendly flame retardant 5-20%.

2. The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 1, characterized in that: The polypropylene is ultra-high fluidity polypropylene with a melt flow rate of 50 to 500 g / 10 min; the long glass fiber is alkali-free continuous high-strength long glass fiber.

3. The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 1, characterized in that: The glass fiber compatibilizer comprises at least one polar monomer grafted polymer, the polymer matrix is ​​one or more of polyethylene, polypropylene, ethylene-α-ethylene-octene copolymer, copolymer of styrene and butadiene, polyethylene-polystyrene-polypropylene terpolymer, ethylene-propylene-butadiene terpolymer, ethylene-acrylate copolymer and ethylene-acrylate-glycidyl methacrylate copolymer, and the polar monomer is maleic anhydride, maleic anhydride analogs, acrylic acid or acrylic acid ester derivatives; The heat stabilizer is one or more of a phenol heat stabilizer, an amine heat stabilizer, a phosphite heat stabilizer, a semi-hindered phenol heat stabilizer, a composite heat stabilizer of an acryloyl functional group and a thioester, and a calixarene heat stabilizer; The lubricant is one or more of a metal soap lubricant, a low molecular weight ester lubricant, a stearic acid complex ester lubricant and an amide lubricant; The ultraviolet absorber is one or more of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole, and monobenzoic acid resorcinol ester; The environmentally friendly flame retardant is one or more of an inorganic flame retardant, a phosphorus flame retardant, a nitrogen flame retardant and a silicon oxide flame retardant.

4. The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 1, characterized in that: The density of the hollow glass microspheres is 0.15-0.6 kg / m 3 The particle size is 120-2000 meshes. The hollow glass microspheres are dispersed in a dispersant and subjected to coupling treatment using a coupling agent. The coupling agent is one or more of a silane coupling agent, a titanate coupling agent and an aluminate coupling agent.

5. A method for preparing the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to any one of claims 1 to 4, characterized in that: The steps include: Add the polypropylene, glass fiber compatibilizer, heat stabilizer, lubricant and ultraviolet absorber into a high-speed mixer in order according to the proportions and mix to obtain a polypropylene resin mixture; Adding the polypropylene resin mixture into an extruder and extruding it into an impregnation device connected to the extruder head to obtain a molten polypropylene resin mixture; Drawing the long glass fibers into an impregnation device so that the content of the long glass fibers in the polypropylene resin mixture is 10-50%; Long glass fibers are impregnated and dispersed in a molten polypropylene resin mixture to obtain a long glass fiber polypropylene material; Cooling the long glass fiber polypropylene material and granulating it to obtain long glass fiber reinforced polypropylene particles; The polypropylene, glass fiber compatibilizer, heat stabilizer, lubricant, ultraviolet absorber, hollow glass microspheres and environmentally friendly flame retardant are mixed in a high-speed mixer according to a proportion to obtain a mixture; The mixed material is fed into an extruder, and after extrusion, water-cooled and granulated to obtain polypropylene low-density flame-retardant foaming masterbatch; The long glass reinforced polypropylene particles are mixed with the polypropylene low-density flame-retardant foaming masterbatch to form an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material.

6. The method for preparing the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 5, characterized in that: The impregnation equipment is an impregnation equipment for continuous fiber reinforced thermoplastic material, and the temperature of the impregnation equipment is set at 200°C-250°C.

7. The method for preparing the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 5, characterized in that: The extruder is a twin-screw extruder with a screw diameter of 63 mm and a screw length-to-diameter ratio of 40:

1. The mixing and melting temperature is set at 190° C. and the die head temperature is set at 200° C.

8. The method for preparing the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 5, characterized in that: When the long glass fibers are drawn into the impregnation device, the content of the long glass fibers in the polypropylene resin mixture is controlled to be 10-50% by selecting the size of the shaping die, and the size of the shaping die is 4 mm.

9. The method for preparing the environmentally friendly flame-retardant long glass fiber reinforced polypropylene material according to claim 5, characterized in that: The temperature of the high speed mixer is set at 40-60°C, and the mixing time is 3-8 minutes; the granulation is performed by cutting into particles with a length of 0.8-1.2 cm using a granulator.

10. Application of an environmentally friendly flame-retardant long glass fiber reinforced polypropylene material, characterized in that: The environmentally friendly flame-retardant long glass fiber reinforced polypropylene material prepared by the preparation method described in any one of claims 5 to 9 is used to manufacture housings of electronic and electrical products.

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