CN114539593A - High-wave-transmittance composite material and preparation method and application thereof - Google Patents
High-wave-transmittance composite material and preparation method and application thereof Download PDFInfo
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- CN114539593A CN114539593A CN202210158125.1A CN202210158125A CN114539593A CN 114539593 A CN114539593 A CN 114539593A CN 202210158125 A CN202210158125 A CN 202210158125A CN 114539593 A CN114539593 A CN 114539593A
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Classifications
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
- B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/223—Packed additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C2001/0054—Fuselage structures substantially made from particular materials
- B64C2001/0072—Fuselage structures substantially made from particular materials from composite materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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Abstract
The invention discloses a high-wave-transmission composite material and a preparation method and application thereof, wherein the high-wave-transmission composite material is prepared from the following raw materials in parts by weight: 85-90 parts of fiber reinforced polypropylene resin and 10-15 parts of foaming master batch; the fiber reinforced polypropylene resin is prepared from the following raw materials in parts by weight: 60-70 parts of polypropylene resin, 20-30 parts of quartz fiber, 2-8 parts of toughening compatilizer, 0.2-0.6 part of antioxidant and 0.2-0.7 part of lubricant; the foaming master batch is prepared from the following raw materials in parts by weight: 60-70 parts of linear low-density polyethylene, 30-40 parts of foaming agent, 2-8 parts of nucleating agent, 1-3 parts of plasticizer, 1-3 parts of dispersing agent and 1-3 parts of accelerator. The prepared composite material has extremely low thermal conductivity and toughness, low dielectric constant and dissipation factor and excellent wave-transmitting property.
Description
Technical Field
The invention belongs to the technical field of production and processing of engineering composite materials, and particularly relates to a high-wave-transmission composite material as well as a preparation method and application thereof.
Background
A wave-transparent material is a material that is transparent to electromagnetic waves and hardly changes the properties (including energy) of the electromagnetic waves. The composite material with wave-transmitting rate meeting the requirements of people is obtained by taking high polymer materials with different properties as a matrix and adjusting the dielectric constant and dissipation factor of the material through means of filling and blending microwave ceramic medium, composite fiber and the like while ensuring that the material has good mechanical force bearing and other properties. In practical application, the dielectric constant and the dissipation factor are two important indexes for measuring the wave-transmitting capacity of the wave-transmitting material, and according to the use environment of the wave-transmitting material, other properties besides the wave-transmitting rate, such as long-time high-temperature resistance, high rigidity, stable size, flame retardance, toughness, chemical corrosion, wear resistance, self-lubrication, aging resistance and the like, need to be considered.
The high-wave-transparent material can avoid a large amount of reflection of incident electromagnetic waves, thereby avoiding the detection of enemy radars, and is mainly applied to the field of radio. The high-wave-transparent material is mostly applied to antenna covers and radar covers at present, and is beneficial to many links of receiving, transmitting, amplifying, mixing, transmitting and the like of microwave-millimeter wave signals. In order to ensure the normal use of the radar or the antenna in various complex environments, the composite material for the radome or the antenna housing must have the performances of high specific strength, high wave-transmitting rate and the like, and good vibration prevention and ageing resistance needs to be considered in design.
In recent years, high-wave-transparent materials are gradually applied to the field of automobiles, and the development trend of the automobile industry is the automatic driving technology of automobiles. The automatic driving of the automobile depends on the cooperative combination of various technologies, so that an on-board computer (Electronic Control Unit, ECU) can automatically and safely drive under the unmanned condition, and a series of actions such as driving, parking, pedestrian avoidance, obstacle avoidance and the like are realized. The progress of the technology greatly improves the problems of road congestion and traffic safety reduction. Under the background that the size of the current automobile cannot be greatly upgraded temporarily, the space needs to be stolen by depending on the flexible and changeable molding capacity of plastic parts, and the light weight is a permanent subject, so that the method has direct help on ensuring the sufficient endurance mileage. Therefore, the unmanned vehicle has a relatively high demand for a high wave-transmitting material. At present, there are also some publications on high wave-transparent composite materials and their preparation methods, such as:
1. patent application CN112625352A discloses a high heat-resistant ultralow dielectric quartz fiber reinforced polypropylene material and a preparation method thereof, wherein the high heat-resistant ultralow dielectric quartz fiber reinforced polypropylene material comprises the following components in parts by weight: 60-93 parts of polypropylene resin, 2-10 parts of maleic anhydride grafted polypropylene and 5-30 parts of quartz fiber. According to the method, the maleic anhydride grafted polypropylene is added as a compatilizer, so that the compatibility of the polypropylene resin and the quartz fiber is improved, the effective combination of the polypropylene resin and the quartz fiber is enhanced, the thermal deformation temperature of the material is improved to a certain extent, and the linear expansion coefficient, the dielectric constant and the dielectric loss of the material are reduced.
2. Patent application CN111073148A discloses a low dielectric constant micro-foamed glass fiber reinforced polypropylene compound, which comprises the following components in parts by weight: 15-70 parts of low-melting-point homopolymerized polypropylene, 12-70 parts of low-melting-point copolymerized polypropylene, 10-30 parts of long glass fiber, 2-5 parts of tackifier, 0.5-2 parts of nucleating agent, 0.3-1 part of antioxidant and 0.3-1 part of lubricant. According to the method, tetrafluoroethylene is used as a tackifier to improve the melt viscosity, so that the micro-foaming process is facilitated, and the obtained polypropylene compound has the characteristics of low density, high strength, low dielectric constant and the like, and is a material very suitable for 5G products, especially 5G base station antenna housing and the like.
3. Patent application CN201611236556.6, an injection-moldable, high-wave-transparent composite material and a preparation method thereof, is prepared from the following components in parts by weight: 50-80 parts of POK, 20-40 parts of PFA, 0.8-2 parts of LLDPE, 10-15 parts of composite filler, 0.1-0.3 part of coupling agent, 0.5-1 part of antioxidant and 0-1 part of lubricant. The method can be used for injection molding and injection molding of the high-wave-transmission composite material, has high wave-transmission rate, and can be applied to the aspects of radars or antenna covers.
4. Patent application CN201711306291.7 discloses a light high-wave-transmission composite material and a preparation method thereof, wherein the light high-wave-transmission composite material comprises the following components in parts by weight: 55-75 parts of polyether ketone material, 5-20 parts of polyether sulfone, 10-40 parts of reinforcement, 1-5 parts of foaming agent and 0.2-1 part of dispersing agent. And its preparing process are also disclosed. The method adopts a thermoplastic polyether ketone material with high heat resistance and high strength as a matrix, and an inorganic fiber with high strength, high modulus and high wave permeability as a reinforcement to prepare the thermoplastic composite material with high wave permeability, and further adopts a micro-foaming technology to obtain a lighter high wave permeability material on the premise of meeting the performance requirements of the antenna housing material such as high wave permeability, low loss, high temperature resistance, high rigidity, high strength, stable size and the like, so that the specific gravity of the material is reduced by more than 25%, and the weight reduction requirement of the product is met. The material can be directly extruded and injection molded by the method, and the product efficiency is high.
5. Patent application CN201310309110.1 discloses a high-wave-transmission porous quartz/quartz ceramic-based composite material, which consists of a quartz fiber reinforcement, a quartz substrate and pore canals, wherein the pore canals are uniformly arranged on the part, close to the inner surface, of the quartz/quartz ceramic-based composite material, pure iron wires are prefabricated in a reinforcing structure formed by weaving or laminating quartz fibers, the quartz-based composite material is synthesized by a sol-gel method, and then the iron wires in the composite material are corroded by using a mixed solution of nitric acid and sulfuric acid, so that the high-wave-transmission porous quartz/quartz ceramic-based composite material is obtained. The method has the advantages that the material has high strength and good mechanical property and wave-transmitting property.
6. Patent application CN202010469987.7 discloses a manufacturing method of novel high wave-transparent thermoplastic composite material prepreg, including composite material prepreg, the composite material prepreg includes: the reinforced fiber material, the polytetrafluoroethylene matrix and the toughened thermoplastic resin are prepared by firstly taking polytetrafluoroethylene as a matrix, preparing the reinforced fiber material into a fiber/polytetrafluoroethylene composite material by a hot melting method, and compounding the fiber/polytetrafluoroethylene composite material with the toughened thermoplastic resin to prepare the high-wave-transmission thermoplastic composite material prepreg. The method has a scientific and reasonable structure, is safe and convenient to use, improves the high wave permeability and the thermoplasticity through the prepreg of the composite material, further improves the thermoplasticity of the composite material through the plastic resin of the toughening compatilizer, is a novel composite material, and is suitable for popularization and use.
In the above prior art, patent application CN112625352A uses maleic anhydride grafted polypropylene as a compatibilizer due to the poor interface compatibility between the quartz fiber and the resin, and is affected by the grafting ratio, and the dielectric constant is relatively high. Patent application CN111073148A uses a glass fiber reinforced material, glass fiber has low strength and high dielectric constant compared to quartz fiber, and the application range is limited. And patent applications CN201611236556.6, CN201711306291.7, CN201310309110.1 and CN202010469987.7 all have the problems of low yield of base material, difficult procurement and high cost, and have greater advantages compared with polypropylene which has low density, low price and easy processing, and is modified by using polypropylene as the base material. For the unmanned automobile, in order to ensure the processor to normally exert the efficacy, the anti-electromagnetic interference capability of the plastic part is necessarily required to be higher, namely the high wave permeability of the modified material depends on the critical indexes of the dielectric constant and the dissipation factor of the material. It follows that the composite materials produced by the prior art are not well suited for use in the field of unmanned vehicles.
Currently, polypropylene is a commonly used modified plastic with low density and dielectric constant, excellent mechanical properties, and good stress resistance, yield resistance, and chemical resistance, but polypropylene materials have relatively poor heat resistance, and thus, no prior art has been found to be used for producing composite materials for unmanned vehicles.
Disclosure of Invention
The invention provides a high-wave-transmission composite material and a preparation method and application thereof to solve the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a high-wave-transmission composite material is prepared from the following raw materials in parts by weight: 85-90 parts of fiber reinforced polypropylene resin and 10-15 parts of foaming master batch; the fiber reinforced polypropylene resin is prepared from the following raw materials in parts by weight: 60-70 parts of polypropylene resin (PP-K7726H), 20-30 parts of quartz fiber, 2-8 parts of toughening compatilizer, 0.2-0.6 part of antioxidant and 0.2-0.7 part of lubricant; the foaming master batch is prepared from the following raw materials in parts by weight: 60-70 parts of linear low density polyethylene (LDPE-2426K), 30-40 parts of foaming agent, 2-8 parts of nucleating agent, 1-3 parts of plasticizer, 1-3 parts of dispersing agent and 1-3 parts of promoter.
Further, the high-wave-permeability composite material is prepared from the following raw materials in parts by weight: 86-89 parts of fiber reinforced polypropylene resin and 11-14 parts of foaming master batch; the fiber reinforced polypropylene resin is prepared from the following raw materials in parts by weight: 61-69 parts of polypropylene resin, 21-29 parts of quartz fiber, 3-7 parts of toughening compatilizer, 0.3-0.5 part of antioxidant and 0.3-0.6 part of lubricant; the foaming master batch is prepared from the following raw materials in parts by weight: 61-69 parts of linear low-density polyethylene, 31-39 parts of foaming agent, 3-7 parts of nucleating agent, 1.5-2.5 parts of plasticizer, 1.5-2.5 parts of dispersing agent and 1.5-2.5 parts of accelerator.
Further, the high-wave-permeability composite material is prepared from the following raw materials in parts by weight: 88 parts of fiber reinforced polypropylene resin and 13 parts of foaming master batch; the fiber reinforced polypropylene resin is prepared from the following raw materials in parts by weight: 65 parts of polypropylene resin, 25 parts of quartz fiber, 5 parts of toughening compatilizer, 0.4 part of antioxidant and 0.5 part of lubricant; the foaming master batch is prepared from the following raw materials in parts by weight: 65 parts of linear low-density polyethylene, 35 parts of foaming agent, 5 parts of nucleating agent, 2 parts of plasticizer, 2 parts of dispersant and 2 parts of accelerator.
Further, the polypropylene resin is high-flow high-impact PP-K7726H, the melt index is 25-27 g/10min, and the notch impact is 15Kj/m2。
Furthermore, the monofilament diameter of the quartz fiber is 5-15 μm; the toughening compatilizer is PP-g-POE-MAH.
Further, the antioxidant is a high-efficiency stabilizer formed by compounding a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a multifunctional hindered phenol antioxidant 1010, and the auxiliary antioxidant is phosphite 168.
Further, the lubricant is one or more of silicone master batch HMB and stearic acid.
Further, the linear low density polyethylene is LDPE-2426K with self-lubricating and anti-caking properties.
Further, the blowing agent is an AC blowing agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
Further, a preparation method of the high wave-transparent composite material comprises the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material.
Further, in the step (1), the rotating speed of a main machine is controlled to be 300-500 r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 300-400 r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of the machine head is 220-230 ℃, the temperature of the shearing section is 235-240 ℃, and the temperature of the conveying section is 190-220 ℃.
Further, in the step (2), the rotating speed of the main machine of the high-speed stirrer ranges from 200r/min to 300 r/min; the rotating speed is controlled to be 200-400 r/min during extrusion granulation, and the temperature is controlled to be 100-130 ℃; the vacuum degree is > -0.6 MPa.
Further, the application of the high-wave-transparent composite material is characterized in that: the high-wave-transparent composite material is applied to the fields of unmanned automobiles, aerospace and 5G communication.
The principle of the application is as follows: the polypropylene has the characteristics of low density, high impact resistance and easiness in processing, is used as a main raw material of plastic parts on automobiles, has a low dielectric constant, is modified and has high cost performance when being applied to unmanned automobiles. The quartz fiber has a series of comprehensive and unique performance characteristics such as excellent dielectric property, thermal property, mechanical property, chemical property and the like. Based on the excellent performances, the quartz fiber reinforced polypropylene is used, and the characteristics of the quartz fiber reinforced polypropylene are kept, and the quartz fiber reinforced polypropylene is subjected to micro-foaming through the foaming master batch, so that uniformly distributed pores in the product are formed through foaming, the pores are filled with air, and the dielectric constant of the air is close to 1, so that the aim of reducing the dielectric constant of the product again is fulfilled. In the aspect of the auxiliary agent, the function of the toughening compatilizer can improve the impact of the material; the antioxidant improves the ageing resistance under high temperature conditions; the lubricant improves workability. Therefore, the quartz fiber reinforced polypropylene resin has lower low dielectric constant and excellent mechanical property, and can be well applied to the unmanned automobile structural part.
Although the quartz fiber reinforced polypropylene material is excellent in mechanical property, the dielectric constant and the loss factor of the quartz fiber reinforced polypropylene material cannot be well applied to high-wave-transparent parts, so that the polypropylene fiber is suitable for material micro-foaming, wherein the polyethylene has a low melting point and is used as a carrier of foaming master batches; the nucleating agent has the function of forming bubble nucleus hollows on a tiny layer surface or space, so that the dielectric loss is effectively reduced; the plasticizer and the dispersant are favorable for the good dispersion of the AC foaming agent and the polyethylene resin. A polymer material containing a large amount of bubbles and having a plastic as a basic component, and therefore, a composite plastic having a gas as a filler; compared with pure plastic, the composite material has many excellent performances, such as light weight, low dielectric constant, high specific strength, capability of absorbing impact load, good heat insulation and sound insulation performance and the like, so that the composite material is subjected to micro-foaming to effectively reduce loss factors, reduce the interference of an external electric field, reduce the specific gravity and realize light weight.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the quartz fiber has a series of comprehensive and unique performance characteristics such as excellent dielectric property, thermal property, mechanical property, chemical property and the like, in particular low dielectric constant and dielectric loss property. The quartz fiber used in the high-wave-transparent composite material has low dielectric constant and high heat resistance, the polypropylene used also has lower dielectric constant, and the quartz fiber can enhance the low dielectric constant of the polypropylene material, so that on one hand, the composite material has low dielectric loss after the quartz fiber and the quartz fiber are mixed, and the composite material has good wave-transparent property; on the other hand, the heat resistance of the quartz fiber per se enables the composite material to have ultrahigh heat resistance.
(2) According to the method, the special foaming master batches are self-made according to the performance and application of the composite material, the product is subjected to micro-foaming by adding the foaming master batches, the foaming auxiliary agent AC-AS is hot-melt and replaces zinc oxide to be used AS a foaming catalyst, each AC foaming agent can be catalyzed, the catalytic reaction form is close to the AC decomposition rate, the temperature difference of the material is small, the crosslinking density is good, the prepared composite material has extremely low heat conductivity coefficient and toughness, and the excellent wave-transmitting characteristic is achieved. The composite material prepared by the method is low in dielectric constant and dissipation factor, so that the effect of high wave transmission is achieved.
(3) According to the invention, quartz fiber is adopted for modification and reinforcement, so that the heat resistance is improved, and meanwhile, the composite material combining micro-foaming is prepared by adopting the self-made foaming master batch, so that the composite material has a very low dielectric loss value in a wider frequency band, and has great application advantages in the field of unmanned automobiles.
(4) According to the preparation method, the polypropylene is subjected to fiber reinforcement modification, so that the bending strength and modulus of the composite material are improved, and the heat resistance of the composite material is greatly improved.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
The high-wave-transparent composite material is prepared by carrying out 6 examples and carrying out comparative experiments, wherein the formulas of the composite materials of the examples 1-6 and the comparative examples 1-6 are shown in the following table 1, and the composite materials of all the examples and the comparative examples are prepared by mixing fiber reinforced polypropylene resin and foaming master batches according to corresponding proportions.
TABLE 1
Example 1
A highly wave-transparent composite material having the formulation shown in example 1 of table 1.
Further, the polypropylene resin is high-flow high-impact PP-K7726H, the melt index is 25g/10min, and the notch impact is 15Kj/m2(ii) a The monofilament diameter of the quartz fiber is 5 mu m; the toughening compatilizer is PP-g-POE-MAH; the antioxidant is a high-efficiency stabilizer formed by compounding a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a multifunctional hindered phenol antioxidant 1010, and the auxiliary antioxidant is phosphite 168; the lubricant is one or more of silicone master batch HMB and stearic acid; the linear low-density polyethylene is LDPE-2426K with lubricating and anti-caking properties; the foaming agent is an AC foaming agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
A preparation method of the high-wave-transparent composite material comprises the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
the rotating speed of the main machine is controlled to be 300r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 300r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of a machine head is 220 ℃, the temperature of a shearing section is 235 ℃, and the temperature of a conveying section is 190 ℃;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
in the step (2), the rotating speed of the main machine of the high-speed stirrer is 200 r/min; the rotating speed is controlled at 200r/min during extrusion granulation, and the temperature is controlled at 120 ℃; vacuum degree is greater than-0.6 MPa;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material.
The application of the high-wave-transparent composite material is characterized in that: the high-wave-transparent composite material is applied to the fields of unmanned automobiles, aerospace and 5G communication.
Example 2
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared by reducing the dosage of foaming master batches, wherein the formula is shown in table 1 and example 2, and other conditions are unchanged.
Example 3
The difference from the embodiment 1 is that: the formula of a high-wave-transparent composite material, which reduces the dosage of a toughening compatilizer, is shown in the example 3 in the table 1.
Further, the polypropylene resin is high-flow high-impact PP-K7726H, the melt index is 27g/10min, and the notch impact is 15Kj/m2(ii) a The monofilament diameter of the quartz fiber is 15 mu m; the toughening compatilizer is PP-g-POE-MAH; the antioxidant is a high-efficiency stabilizer formed by compounding a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a multifunctional hindered phenol antioxidant 1010, and the auxiliary antioxidant is phosphite 168; the lubricant is one or more of silicone master batch HMB and stearic acid; the linear low-density polyethylene is LDPE-2426K with lubricating and anti-caking properties; the foaming agent is an AC foaming agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
A preparation method of the high-wave-transparent composite material comprises the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
the rotating speed of the main machine is controlled to be 500r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 400r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of a machine head is 230 ℃, the temperature of a shearing section is 240 ℃, and the temperature of a conveying section is 220 ℃;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
in the step (2), the rotating speed of the main machine of the high-speed stirrer is 300 r/min; the rotating speed is controlled at 400r/min and the temperature is controlled at 120 ℃ during extrusion granulation; vacuum degree is greater than-0.6 MPa;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material. Other conditions were unchanged.
Example 4
The difference from the embodiment 1 is that: a high wave-transparent composite material, which reduces the content of quartz fiber in fiber-reinforced polypropylene resin, has the formula shown in example 4 of Table 1.
Further, the polypropylene resin is high-flow high-impact PP-K7726H, the melt index is 25.5g/10min, and the notch impact is 15Kj/m2(ii) a The monofilament diameter of the quartz fiber is 7 μm; the toughening compatilizer is PP-g-POE-MAH; the antioxidant is a high-efficiency stabilizer compounded by a main antioxidant and an auxiliary antioxidant,the primary antioxidant is a multifunctional hindered phenol antioxidant 1010, and the secondary antioxidant is phosphite 168; the lubricant is one or more of silicone master batch HMB and stearic acid; the linear low-density polyethylene is LDPE-2426K with lubricating and anti-caking properties; the foaming agent is an AC foaming agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
A preparation method of the high wave-transparent composite material comprises the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
the rotating speed of the main machine is controlled to be 350r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 320r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of the machine head is 222 ℃, the temperature of the shearing section is 236 ℃, and the temperature of the conveying section is 200 ℃;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
in the step (2), the rotating speed of the main machine of the high-speed stirrer is 210 r/min; the rotating speed is controlled at 250r/min during extrusion granulation, and the temperature is controlled at 110 ℃; vacuum degree is greater than-0.6 MPa;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material. Other conditions were unchanged.
Example 5
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared by increasing the dosage of foaming agent and nucleating agent in foaming master batch, wherein the formula is shown in Table 1, example 5, and other conditions are unchanged.
Example 6
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared by reducing the consumption of foaming agent and nucleating agent in foaming master batch, wherein the formula is shown in Table 1, example 6, and other conditions are unchanged.
Example 7
The difference from the embodiment 1 is that: a high-wave-transparent composite material, which increases the dosage of compatilizer in fiber-reinforced polypropylene resin and nucleating agent in foaming master batch, and the formula is shown in Table 1 and example 7.
Further, the polypropylene resin is high-flow high-impact PP-K7726H with a melt index of 26g/10min and a notch impact of 15Kj/m2(ii) a The monofilament diameter of the quartz fiber is 10 mu m; the toughening compatilizer is PP-g-POE-MAH; the antioxidant is a high-efficiency stabilizer formed by compounding a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a multifunctional hindered phenol antioxidant 1010, and the auxiliary antioxidant is phosphite 168; the lubricant is one or more of silicone master batch HMB and stearic acid; the linear low-density polyethylene is LDPE-2426K with lubricating and anti-caking properties; the foaming agent is an AC foaming agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
A preparation method of the high wave-transparent composite material comprises the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
the rotating speed of the main machine is controlled to be 400r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 350r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of a machine head is 225 ℃, the temperature of a shearing section is 237 ℃, and the temperature of a conveying section is 205 ℃;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
in the step (2), the rotating speed of the main machine of the high-speed stirrer is 250 r/min; the rotating speed is controlled at 300r/min and the temperature is controlled at 120 ℃ during extrusion granulation; vacuum degree is greater than-0.6 MPa;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material. Other conditions were unchanged.
Comparative example 1
The difference from example 7 is that: a high-wave-transparent composite material is prepared by replacing quartz fiber with glass fiber, and its formula is shown in comparative example 1 in Table 1, and other conditions are not changed.
Comparative example 2
The difference from example 7 is that: the formula of the high-wave-transparent composite material is shown in the table 1 and the comparative example 2 by replacing the type of the nucleating agent, and other conditions are not changed.
Comparative example 3
The difference from the embodiment 1 is that: the high-wave-transmission composite material is not added with foaming master batches, the formula is shown in a table 1 and a comparative example 3, and other conditions are not changed.
Comparative example 4
The difference from the embodiment 1 is that: the formula of the composite material with high wave-transmitting performance is shown in the comparative example 4 in the table 1, and the other conditions are not changed.
Comparative example 5
The difference from the embodiment 1 is that: a high-wave-transmission composite material is characterized in that a foaming agent in foaming master batches is replaced by a foaming agent TSH, the formula of the foaming master batches is shown in a table 1 and a comparative example 5, and other conditions are not changed.
Comparative example 6
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared through mixing foaming agent, polypropylene and quartz fibres, fusing and extruding out, and features that its formula is shown in comparative example 6 in Table 1, and its other conditions are not changed.
Comparative example 7
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared by adjusting the mixing ratio of fiber reinforced polypropylene resin to foaming master batch, namely, reducing the ratio of the fiber reinforced polypropylene resin and correspondingly increasing the ratio of the foaming master batch, wherein the formula is shown in comparative example 7 in Table 1, and other conditions are unchanged.
Comparative example 8
The difference from the embodiment 1 is that: a high-wave-transparent composite material is prepared by adjusting the mixing ratio of fiber reinforced polypropylene resin to foaming master batch, namely increasing the ratio of fiber reinforced polypropylene resin and correspondingly decreasing the ratio of foaming master batch, wherein the formula is shown in comparative example 8 in Table 1, and other conditions are unchanged.
Comparative example 9
The difference from example 7 is that: the formula of the high-wave-transparent composite material is shown in comparative example 9 in table 1, and other conditions are unchanged.
Comparative example 10
The difference from example 7 is that: the formula of the high-wave-transparent composite material is shown in comparative example 10 in table 1, and other conditions are unchanged.
Comparative example 11
The difference from example 7 is that: the formula of the high-wave-transmission composite material is shown in a table 1 and a comparative example 11, and other conditions are unchanged.
Comparative example 12
The difference from example 7 is that: the formula of the composite material with high wave transmittance is shown in a comparative example 12 in a table 1, and other conditions are unchanged.
To further illustrate that the present invention can achieve the technical effects, the experimental results of examples 1 to 6 and comparative examples 1 to 6 were tested according to the following methods:
for example, the test criteria for the relevant performance indicators are: tensile strength according to GB/T1040; flexural strength and flexural modulus according to GB/T9341; the impact strength of the cantilever beam notch is GB/T1843; melt index in GB/T3682; density according to GB/T1033; dielectric constant according to GB/T1409; pore size the mean was calculated using scanning electron microscopy and software analysis. The test results are shown in table 2 below.
TABLE 2
From the experimental results of table 2, it can be seen that: the comparison of the experimental results of the embodiment 1 and the embodiment 2 shows that the dielectric constant can be effectively reduced by adding the foaming master batch to promote the foaming of the product during injection molding and the gap of the foaming pore diameter, because the use amount of the foaming master batch is reduced, the rigidity of the material is enhanced, namely the bending strength and the tensile strength are increased, the impact is reduced, and the dielectric constant is increased along with the increase of the material.
It can be seen from the comparison between the experimental results of example 3 and example 1 that the impact is reduced more, the rigidity is not increased, and the dielectric constant is increased instead by reducing the amount of the toughening compatibilizer, mainly the reduction of the toughening compatibilizer causes the compatibility of the resin and the quartz fiber to be poor, thereby causing the reduction of the physical properties.
From the comparison of the experimental results of example 4 and example 3, it can be seen that the proportion of the fibers is reduced, the impact is higher, the dielectric constant is lower, but the rigidity of the material is also reduced, mainly caused by the reduction of the fiber content.
It can be seen from the comparison between the experimental results of example 5 and example 3 that, increasing the amount of the foaming agent and the nucleating agent in the foaming masterbatch improves the performance and reduces the dielectric constant, which indicates that with the increase of the nucleating agent, the product forms more pores and foam nuclei during the forming process, and the dielectric constant is reduced.
As can be seen from the comparison of the experimental results of example 6 and example 5, the amount of the nucleating agent in the foaming masterbatch is reduced, the dielectric constant becomes high, and the foaming degree is mainly influenced by the nucleating agent.
As can be seen from the comparison of the experimental results of example 7 and example 3, the dielectric constant becomes lower by increasing the amount of the nucleating agent in the foaming masterbatch, which is equivalent to the dielectric constant obtained by adding 8 parts of the nucleating agent in example 5.
Compared with the experimental results of the comparative example 1 and the example 7, the experiment results show that the conventional physical properties of the quartz fiber are reduced more and the dielectric constant is increased by 1 after the quartz fiber is replaced by the glass fiber, which indicates that the glass fiber has larger enhancement modification difference on polypropylene compared with the quartz fiber and is not suitable for high-wave-transparent materials.
As can be seen from comparison of the experimental results of comparative example 2 and example 7, the performance of the nucleating agent titanium dioxide is reduced when GT-666 is replaced by GT-666, because GT-666 is a commonly used polypropylene modified beta-crystal nucleating agent, the nucleating mechanism is that pits are formed on the surface of the nonpolar part of the nucleating agent and are connected with the polypropylene molecular chains to be orderly arranged, so that the nucleation is promoted, and the titanium dioxide is a polycrystalline compound.
As can be seen from comparison of the experimental results of comparative example 3 and example 7, the dielectric constant increases even though the rigidity increases without adding the foaming mother particles, and the purpose of high wave-transmitting property cannot be achieved.
As can be seen from the comparison of the experimental results of comparative example 4 and example 7, the toughening compatibilizer is replaced by the conventional POE, which causes the performance to be reduced due to the poor compatibility of the fiber and the resin and also affects the dielectric constant.
As can be seen from comparison of the experimental results of comparative example 5 and example 7, the replacement of the foaming agent has the disadvantages of low decomposition temperature and low gas evolution of the TSH foaming agent, which affects the foaming quality and increases the dielectric constant.
As can be seen from the comparison of the experimental results of comparative example 6 and example 7, the blowing agent is directly added to the polypropylene and quartz fiber for melt extrusion, and the difference of the extrusion parameters of the blowing agent and the quartz fiber causes poor compatibility, so that the performance is low.
As can be seen from the comparison of the experimental results of comparative example 7 and example 1, the reduction of the ratio of the quartz fiber reinforced polypropylene resin and the corresponding increase of the ratio of the foaming master batch have the disadvantages of lower mechanical properties, reduced rigidity and limited application.
As can be seen from the comparison of the experimental results of comparative example 8 and example 1, the mechanical properties become higher as the proportion of the quartz fiber reinforced polypropylene resin is increased and the proportion of the foaming master batch is correspondingly decreased, but the dielectric constant also becomes higher.
As can be seen from comparison of the experimental results of comparative example 9 and example 7, increasing the content of quartz fiber in the quartz fiber-reinforced polypropylene resin improves the mechanical strength, increases the dielectric constant, and the appearance of the product is not smooth enough and the fiber exposure is severe.
As can be seen from comparison of the experimental results of comparative example 10 and example 7, the content of the quartz fiber in the quartz fiber-reinforced polypropylene resin is reduced, the mechanical strength is low, the rigidity is poor, and the deformation is easy.
As can be seen from the comparison of the experimental results of comparative example 11 and example 7, the increase of the content of the foaming agent in the foaming master batch lowers the mechanical properties, does not lower the dielectric constant, and has no advantages of high cost.
As can be seen from the comparison of the experimental results of comparative example 12 and example 5, the content of the foaming agent in the foaming mother particles is reduced, and the dielectric constant is increased.
According to the comprehensive analysis of the results of the 19 groups of experiments, the quartz fiber reinforced polypropylene can greatly improve the mechanical property of the polypropylene and is excellent in dielectric property.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. The high-wave-permeability composite material is characterized by being prepared from the following raw materials in parts by weight: 85-90 parts of fiber reinforced polypropylene resin and 10-15 parts of foaming master batch; the fiber reinforced polypropylene resin is prepared from the following raw materials in parts by weight: 60-70 parts of polypropylene resin, 20-30 parts of quartz fiber, 2-8 parts of toughening compatilizer, 0.2-0.6 part of antioxidant and 0.2-0.7 part of lubricant; the foaming master batch is prepared from the following raw materials in parts by weight: 60-70 parts of linear low-density polyethylene, 30-40 parts of foaming agent, 2-8 parts of nucleating agent, 1-3 parts of plasticizer, 1-3 parts of dispersing agent and 1-3 parts of accelerator.
2. The highly wave-transparent composite material according to claim 1, wherein: the polypropylene resin is high-flow high-impact PP-K7726H, the melt index is 25-27 g/10min, and the notch impact is 15Kj/m2。
3. The highly wave-transparent composite material according to claim 1, wherein: the monofilament diameter of the quartz fiber is 5-15 mu m; the toughening compatilizer is PP-g-POE-MAH.
4. The highly wave-transparent composite material according to claim 1, wherein: the antioxidant is a high-efficiency stabilizer formed by compounding a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a multifunctional hindered phenol antioxidant 1010, and the auxiliary antioxidant is phosphite 168.
5. The highly wave-transparent composite material according to claim 1, wherein: the lubricant is one or more of silicone master batch HMB and stearic acid; the linear low density polyethylene is LDPE-2426K with lubricating and anti-caking functions.
6. The highly wave-transparent composite material according to claim 1, wherein: the foaming agent is an AC foaming agent; the nucleating agent is TiO2(ii) a The accelerant is an ammonia-free catalyst AC-AS; the plasticizer is DOTP; the dispersing agent is stearate.
7. A method for preparing the high wave-transparent composite material according to any one of claims 1 to 6, comprising the following steps:
(1) preparation of fiber-reinforced polypropylene resin: weighing the polypropylene resin, the toughening compatilizer, the antioxidant and the lubricant according to the parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, then extruding the mixture by a double-screw extruder in a vacuum state, adding quartz fibers into a glass fiber port, and then carrying out traction, cooling, air drying, grain cutting and drying on the mixture to obtain the fiber reinforced polypropylene resin;
(2) preparing the foaming master batch: weighing low linear density polyethylene, an AC foaming agent, a nucleating agent, a lubricant, a plasticizer and a catalyst according to parts by weight, feeding the materials into a high-speed stirrer together, stirring, mixing and uniformly mixing, and then extruding and granulating through a single-screw extruder under a vacuum state to obtain foaming master batches;
(3) and (3) weighing the fiber reinforced polypropylene resin prepared in the step (1) and the foaming master batch prepared in the step (2) according to the parts by weight, and uniformly stirring and mixing to obtain the high-wave-transmission composite material.
8. The method for preparing a high wave-transparent composite material according to claim 7, wherein: in the step (1), the rotating speed of a main machine is controlled to be 300-500 r/min during stirring of the high-speed stirrer, and the rotating speed is controlled to be 300-400 r/min during extrusion; the vacuum degree is more than-0.6 MPa, and the temperature in each interval is controlled as follows: the temperature of the machine head is 220-230 ℃, the temperature of the shearing section is 235-240 ℃, and the temperature of the conveying section is 190-220 ℃.
9. The method for preparing a high wave-transparent composite material according to claim 7, wherein: in the step (2), the rotating speed of the main machine of the high-speed stirrer is 200-300 r/min; the rotating speed is controlled to be 200-400 r/min during extrusion granulation, and the temperature is controlled to be 100-130 ℃; the vacuum degree is > -0.6 MPa.
10. Use of a highly wave-transparent composite material according to any one of claims 1 to 9, characterized in that: the high-wave-transparent composite material is applied to the fields of unmanned automobiles, aerospace and 5G communication.
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