CN115216086A - High-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and preparation method thereof - Google Patents
High-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and preparation method thereof Download PDFInfo
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- C08L2201/02—Flame or fire retardant/resistant
Abstract
The invention relates to the technical field of electromagnetic shielding composite materials and preparation thereof, in particular to a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and a preparation method thereof, aiming at the problems of low flame-retardant effect and poor material shielding effect caused by high conductivity of the existing electromagnetic shielding composite material, the following scheme is provided, wherein the high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material comprises the following raw materials in parts by weight: 80-100 parts of polypropylene, 20-35 parts of graphite, 30-40 parts of magnetic particles and 5-15 parts of coupling agent, and aims to improve the flame retardant effect remarkably by soaking the polypropylene raw material in a bromine-containing alkyl phosphate solution and coating a flame retardant on the prepared material, and reduce the conductivity of the material and improve the electromagnetic shielding effect by filling carbon fibers with the surfaces plated with silicon carbide particles and deposited with ultrafine graphite particles.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding composite materials and preparation thereof, in particular to a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and a preparation method thereof.
Background
Along with the development of modern high and new technology, the problems of electromagnetic interference (EMI) and electromagnetic compatibility (EMC) caused by electromagnetic waves are increasingly serious, so that the interference and the damage to electronic instruments and equipment are caused, the normal T-work of the electronic instruments and equipment is influenced, the international competitiveness of electronic products and equipment in China is severely restricted, the environment is polluted, and the health of human beings is harmed; in addition, the leakage of electromagnetic waves can also endanger the security of national information security and military core secrets. In particular, the electromagnetic pulse weapon, which is a new concept weapon, has made a substantial breakthrough, and can directly strike electronic equipment, electric power systems, etc. to cause temporary failure or permanent damage to information systems, etc., and the delivery methods thereof are various, and the destructive power is extremely strong, and strong electromagnetic pulses can also cause damage to human bodies, causing human nerve disorder, behavior runaway, etc. Therefore, the method has important significance for exploring an efficient electromagnetic shielding material, preventing the problems of electromagnetic interference and electromagnetic compatibility caused by electromagnetic waves, improving the safety and reliability of electronic products and equipment, promoting international competitiveness, preventing striking of electromagnetic pulse weapons, and ensuring the safety and smoothness of information communication systems, network systems, transmission systems, weapon platforms and the like. In view of the important role of electromagnetic shielding materials in social life, economic construction and national defense construction, the research and development of electromagnetic shielding materials are becoming important issues of people's attention.
However, the existing electromagnetic shielding composite material still has the problems of low flame retardant effect and poor shielding effect of the material due to high electric conductivity, so that a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and a preparation method thereof are provided for solving the problems.
Disclosure of Invention
The invention aims to solve the problems of poor material shielding effect and the like caused by low flame retardant effect, high conductivity and the like of the existing electromagnetic shielding composite material, and provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material comprises the following raw materials in parts by weight: 80-100 parts of polypropylene, 20-35 parts of graphite, 30-40 parts of magnetic particles, 5-15 parts of coupling agent, 10-25 parts of flame retardant and 12-25 parts of carbon fibers;
preferably, the feed comprises the following raw materials in parts by weight: 85-100 parts of polypropylene, 20-30 parts of graphite, 32-40 parts of magnetic particles, 7-15 parts of coupling agent, 12-25 parts of flame retardant and 14-25 parts of carbon fiber;
preferably, the feed comprises the following raw materials in parts by weight: 90-100 parts of polypropylene, 25-30 parts of graphite, 35-40 parts of magnetic particles, 10-15 parts of coupling agent, 14-25 parts of flame retardant and 18-25 parts of carbon fiber;
the invention also provides a preparation method of the high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following steps of:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as raw materials for preparation by professionals, and processing the selected raw materials;
s2: material treatment: putting the processed raw materials into a stirrer for stirring, and putting the raw materials into a high-temperature smelting furnace for mixing and heating after stirring;
s3: preparing a product: granulating the molten liquid formed after heating, and putting the granulated liquid into a mould for extrusion forming to prepare the polypropylene electromagnetic shielding composite material;
s4: and (3) processing: carrying out surface treatment and laser punching on the prepared polypropylene electromagnetic shielding composite material;
s5: real-time monitoring: the polypropylene electromagnetic shielding composite material is monitored manually in real time in the preparation process and processed according to the monitoring result;
preferably, in the step S1, a professional selects polypropylene, graphite, magnetic particles and a coupling agent as raw materials for preparation, and processes the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is completed, the soaking time is 30min, and the polypropylene is placed in an oven for drying after the soaking is completed, wherein the drying temperature is kept at 80-100 ℃ during the drying, and the drying time is kept at 20-30min;
preferably, in S2, the processed raw material is put into a stirrer to be stirred, wherein the stirrer speed is 6r/min, the stirring time is 20-30min, and the raw material usage ratio is manually prepared before stirring, wherein the raw material usage ratio is polypropylene: graphite: magnetic particles: the coupling agent is 8;
preferably, in S3, the melt formed after heating flows into a pelletizer, and is extruded and pelletized through the pelletizer, wherein the internal temperature needs to be kept above 400 ℃ when the pelletizer is used for pelletizing, and after pelletizing, the composite material particles are placed into a mold and are extruded and molded by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the mold needs to be manually preheated before the composite particles are placed into the mold, and the composite particles are placed into the mold when the preheating temperature reaches 300 ℃;
preferably, in S4, the surface of the prepared polypropylene electromagnetic shielding composite material is coated with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air-drying treatment is firstly performed after one-time coating, whether the air-drying treatment is completed or not is judged manually, treatment is performed according to a judgment result, secondary coating is performed if the air-drying treatment is completed, air-drying treatment is continued if the air-drying treatment is not completed, the surface coating frequency is 3-5 times, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is completed, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually using a numerical control machine tool after the filling is completed, and shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are manually set for the numerical control machine tool according to customer requirements;
preferably, in S5, in the preparation process of the polypropylene electromagnetic shielding composite material, real-time monitoring is performed manually, wherein the real-time monitoring is performed by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the temperature data is periodically recorded manually when the observation result shows that the temperature data of the electronic display screen is within a specified temperature range, the recording interval time is 0.5h, the temperature data is judged and processed manually when the observation result shows that the temperature data of the electronic display screen is not within the specified temperature range, the heat source inlet is manually closed when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the heat source inlet is inspected when the temperature data of the electronic display screen is lower than the specified temperature range, so as to remove a blockage at the heat source inlet.
Compared with the prior art, the invention has the beneficial effects that:
1. the raw material polypropylene is soaked by adopting a bromine-containing alkyl phosphate solution, and the prepared material is coated with the flame retardant, so that the flame retardant effect is improved remarkably.
2. The carbon fibers with the surfaces plated with the silicon carbide particles and the surfaces deposited with the ultrafine graphite particles are filled, so that the conductivity of the material is reduced, and the electromagnetic shielding effect is improved.
The invention aims to improve the flame retardant effect by soaking the polypropylene raw material in a bromine-containing alkyl phosphate solution and coating the prepared material with a flame retardant, and simultaneously, the invention reduces the conductivity of the material and improves the electromagnetic shielding effect by filling the carbon fiber with the surface coated with silicon carbide particles and the deposited ultrafine graphite particles.
Drawings
Fig. 1 is a flow chart of a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material and a preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example one
Referring to fig. 1, the invention provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following raw materials in parts by weight: 95 parts of polypropylene, 28 parts of graphite, 38 parts of magnetic particles, 13 parts of coupling agent, 18 parts of flame retardant and 22 parts of carbon fiber;
the preparation method comprises the following steps:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as prepared raw materials by professionals, and processing the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher when being processed, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is finished, the soaking time is 30min, the polypropylene is placed into an oven to be dried after the soaking is finished, the drying temperature is kept at 90 ℃ when the drying is carried out, and the drying time is kept at 25min;
s2: material treatment: and (3) placing the processed raw materials into a stirrer for stirring, wherein the speed of the stirrer is 6r/min when stirring is carried out, the stirring time is 25min, and the use proportion of the raw materials is manually prepared before stirring, wherein the use mass proportion of the raw materials is polypropylene: graphite: magnetic particles: the coupling agent is 8;
s3: preparing a product: enabling molten liquid formed after heating to flow into a granulator, and extruding and granulating through the granulator, wherein the internal temperature needs to be kept above 400 ℃ when the granulator is used for granulating, placing composite material particles into a mould after granulating, and extruding and forming the composite material particles by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the mould needs to be manually preheated before the composite particles are placed into the mould, and the composite particles are placed into the mould when the preheating temperature reaches 300 ℃;
s4: and (3) processing: coating the surface of the prepared polypropylene electromagnetic shielding composite material with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air-drying treatment is firstly carried out after primary coating is finished, whether the air-drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air-drying treatment is finished, air-drying treatment is continued if the air-drying treatment is not finished, the surface coating frequency is 4, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually adopting a numerical control machine tool after the filling is finished, and the shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are manually set according to the requirements of customers;
s5: real-time monitoring: the real-time monitoring is carried out manually in the preparation process of the polypropylene electromagnetic shielding composite material, wherein the real-time monitoring is carried out by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the observation result shows that the temperature data of the electronic display screen is in a specified temperature range and the temperature data is periodically recorded manually, the recording interval time is 0.5h, the temperature data of the electronic display screen is judged and processed by manually passing the temperature data of the electronic display screen when the observation result shows that the temperature data of the electronic display screen is not in the specified temperature range, wherein the heat source inlet is manually closed when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the blockage at the heat source inlet is removed when the temperature data of the electronic display screen is lower than the specified temperature range.
Example two
Referring to fig. 1, the invention provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following raw materials in parts by weight: 90 parts of polypropylene, 25 parts of graphite, 35 parts of magnetic particles, 10 parts of coupling agent, 14 parts of flame retardant and 18 parts of carbon fiber;
the preparation method comprises the following steps:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as prepared raw materials by professionals, and processing the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher when being processed, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is finished, the soaking time is 30min, the polypropylene is placed into an oven to be dried after the soaking is finished, the drying temperature is kept at 80 ℃ when the drying is carried out, and the drying time is kept at 20min;
s2: material treatment: and (3) placing the processed raw materials into a stirrer for stirring, wherein the speed of the stirrer is 6r/min when stirring is carried out, the stirring time is 20min, and the use proportion of the raw materials is manually prepared before stirring, wherein the use mass proportion of the raw materials is polypropylene: graphite: magnetic particles: the coupling agent is 8;
s3: preparing a product: enabling molten liquid formed after heating to flow into a granulator, and extruding and granulating through the granulator, wherein the internal temperature needs to be kept above 400 ℃ when the granulator is adopted for granulation, placing composite material particles into a die after granulation and extruding and forming the composite material particles by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the die needs to be manually preheated before the composite particles are placed into the die, and the composite particles are placed when the preheating temperature reaches 300 ℃;
s4: and (3) processing: coating the surface of the prepared polypropylene electromagnetic shielding composite material with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air-drying treatment is firstly carried out after primary coating is finished, whether the air-drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air-drying treatment is finished, air-drying treatment is continued if the air-drying treatment is not finished, the surface coating frequency is 3 times, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually adopting a numerical control machine tool after the filling is finished, and the shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are manually set according to the requirements of customers;
s5: real-time monitoring: the real-time monitoring is carried out manually in the preparation process of the polypropylene electromagnetic shielding composite material, wherein the real-time monitoring is carried out by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the observation result shows that the temperature data of the electronic display screen is in a specified temperature range and the temperature data is periodically recorded manually, the recording interval time is 0.5h, the temperature data of the electronic display screen is judged and processed by manually passing the temperature data of the electronic display screen when the observation result shows that the temperature data of the electronic display screen is not in the specified temperature range, wherein the heat source inlet is manually closed when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the blockage at the heat source inlet is removed when the temperature data of the electronic display screen is lower than the specified temperature range.
EXAMPLE III
Referring to fig. 1, the invention provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following raw materials in parts by weight: 100 parts of polypropylene, 30 parts of graphite, 40 parts of magnetic particles, 15 parts of coupling agent, 25 parts of flame retardant and 25 parts of carbon fiber;
the preparation method comprises the following steps:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as prepared raw materials by professionals, and processing the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher when being processed, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is finished, the soaking time is 30min, the polypropylene is placed into an oven to be dried after the soaking is finished, the drying temperature is kept at 100 ℃ when the drying is carried out, and the drying time is kept at 30min;
s2: material treatment: and (2) putting the processed raw materials into a stirrer for stirring, wherein the speed of the stirrer is 6r/min during stirring, the stirring time is 30min, and the use proportion of the raw materials is manually prepared before stirring, wherein the use mass proportion of the raw materials is as follows: graphite: magnetic particles: the coupling agent is 8;
s3: preparing a product: enabling molten liquid formed after heating to flow into a granulator, and extruding and granulating through the granulator, wherein the internal temperature needs to be kept above 400 ℃ when the granulator is adopted for granulation, placing composite material particles into a die after granulation and extruding and forming the composite material particles by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the die needs to be manually preheated before the composite particles are placed into the die, and the composite particles are placed when the preheating temperature reaches 300 ℃;
s4: and (3) processing: coating the surface of the prepared polypropylene electromagnetic shielding composite material with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air-drying treatment is firstly carried out after primary coating is finished, whether the air-drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air-drying treatment is finished, air-drying treatment is continued if the air-drying treatment is not finished, the surface coating frequency is 5 times, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually adopting a numerical control machine tool after the filling is finished, and the shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are manually set according to the requirements of customers;
s5: real-time monitoring: the real-time monitoring is carried out manually in the preparation process of the polypropylene electromagnetic shielding composite material, wherein the real-time monitoring is carried out by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the observation result shows that the temperature data of the electronic display screen is in a specified temperature range, the temperature data is periodically recorded manually, the recording interval time is 0.5h, the temperature data of the electronic display screen is not in the specified temperature range through the observation result, the temperature data of the electronic display screen is judged and processed manually through the electronic display screen, the heat source inlet is closed manually when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the blockage at the heat source inlet is removed when the temperature data of the electronic display screen is lower than the specified temperature range.
Example four
Referring to fig. 1, the invention provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following raw materials in parts by weight: 99 parts of polypropylene, 26 parts of graphite, 36 parts of magnetic particles, 12 parts of coupling agent, 16 parts of flame retardant and 19 parts of carbon fiber;
the preparation method comprises the following steps:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as prepared raw materials by professionals, and processing the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher when being processed, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is finished, the soaking time is 30min, the polypropylene is placed into an oven to be dried after the soaking is finished, the drying temperature is kept at 88 ℃ when the drying is carried out, and the drying time is kept at 22min;
s2: material treatment: and (3) placing the processed raw materials into a stirrer for stirring, wherein the speed of the stirrer is 6r/min when stirring is carried out, the stirring time is 28min, and the use proportion of the raw materials is manually prepared before stirring is carried out, wherein the use mass proportion of the raw materials is polypropylene: graphite: magnetic particles: the coupling agent is 8;
s3: preparing a product: enabling molten liquid formed after heating to flow into a granulator, and extruding and granulating through the granulator, wherein the internal temperature needs to be kept above 400 ℃ when the granulator is adopted for granulation, placing composite material particles into a die after granulation and extruding and forming the composite material particles by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the die needs to be manually preheated before the composite particles are placed into the die, and the composite particles are placed when the preheating temperature reaches 300 ℃;
s4: and (3) processing: the method comprises the steps of coating the surface of a prepared polypropylene electromagnetic shielding composite material with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air drying treatment is firstly carried out after primary coating is finished, whether the air drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air drying treatment is finished, air drying treatment is continued if the air drying treatment is not finished, the surface coating times are 4, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually adopting a numerical control machine after the filling is finished, and the shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are set by manually according to customer requirements on the numerical control machine;
s5: real-time monitoring: the real-time monitoring is carried out manually in the preparation process of the polypropylene electromagnetic shielding composite material, wherein the real-time monitoring is carried out by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the observation result shows that the temperature data of the electronic display screen is in a specified temperature range and the temperature data is periodically recorded manually, the recording interval time is 0.5h, the temperature data of the electronic display screen is judged and processed by manually passing the temperature data of the electronic display screen when the observation result shows that the temperature data of the electronic display screen is not in the specified temperature range, wherein the heat source inlet is manually closed when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the blockage at the heat source inlet is removed when the temperature data of the electronic display screen is lower than the specified temperature range.
EXAMPLE five
Referring to fig. 1, the invention provides a high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material, which comprises the following raw materials in parts by weight: 93 parts of polypropylene, 27 parts of graphite, 37 parts of magnetic particles, 14 parts of coupling agent, 18 parts of flame retardant and 23 parts of carbon fiber;
the preparation method comprises the following steps:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as prepared raw materials by professionals, and processing the selected raw materials, wherein the selected raw materials are crushed in a unified specification by a crusher when being processed, the crushing specification is set manually, the polypropylene is soaked in a bromine-containing alkyl phosphate solution after the crushing is finished, the soaking time is 30min, the polypropylene is placed into an oven to be dried after the soaking is finished, the drying temperature is kept at 95 ℃ when the drying is carried out, and the drying time is kept at 20min;
s2: material treatment: and (3) placing the processed raw materials into a stirrer for stirring, wherein the speed of the stirrer is 6r/min when stirring is carried out, the stirring time is 25min, and the use proportion of the raw materials is manually prepared before stirring, wherein the use mass proportion of the raw materials is polypropylene: graphite: magnetic particles: the coupling agent is 8;
s3: preparing a product: enabling molten liquid formed after heating to flow into a granulator, and extruding and granulating through the granulator, wherein the internal temperature needs to be kept above 400 ℃ when the granulator is adopted for granulation, placing composite material particles into a die after granulation and extruding and forming the composite material particles by an extruder to prepare the polypropylene electromagnetic shielding composite material, wherein the die needs to be manually preheated before the composite particles are placed into the die, and the composite particles are placed when the preheating temperature reaches 300 ℃;
s4: and (3) processing: coating the surface of the prepared polypropylene electromagnetic shielding composite material with a flame retardant for surface treatment, wherein a stepped coating method is adopted during coating, natural air-drying treatment is firstly carried out after primary coating is finished, whether the air-drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air-drying treatment is finished, air-drying treatment is continued if the air-drying treatment is not finished, the surface coating frequency is 5 times, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, wherein silicon carbide particles and ultrafine graphite particles are plated on the surface of the adopted carbon fibers, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by manually adopting a numerical control machine tool after the filling is finished, and the shape and thickness data of the polypropylene electromagnetic shielding composite material during the laser punching are manually set according to the requirements of customers;
s5: real-time monitoring: the real-time monitoring is carried out manually in the preparation process of the polypropylene electromagnetic shielding composite material, wherein the real-time monitoring is carried out by manually observing temperature data in real time through an electronic display screen of a temperature sensor and processing the temperature data through an observation result, the observation result shows that the temperature data of the electronic display screen is in a specified temperature range and the temperature data is periodically recorded manually, the recording interval time is 0.5h, the temperature data of the electronic display screen is judged and processed by manually passing the temperature data of the electronic display screen when the observation result shows that the temperature data of the electronic display screen is not in the specified temperature range, wherein the heat source inlet is manually closed when the temperature data of the electronic display screen exceeds the specified temperature range, the heat source inlet is opened until the temperature data of the electronic display screen is restored to the specified temperature range, and the blockage at the heat source inlet is removed when the temperature data of the electronic display screen is lower than the specified temperature range.
The high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment is tested, and the following results are obtained:
compared with the existing materials, the flame retardant effect and the shielding effect of the high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material prepared in the first embodiment, the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment are both obviously improved, and the first embodiment is the best embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material is characterized by comprising the following raw materials in parts by weight: 80-100 parts of polypropylene, 20-35 parts of graphite, 30-40 parts of magnetic particles, 5-15 parts of coupling agent, 10-25 parts of flame retardant and 12-25 parts of carbon fibers.
2. The high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 85-100 parts of polypropylene, 20-30 parts of graphite, 32-40 parts of magnetic particles, 7-15 parts of coupling agent, 12-25 parts of flame retardant and 14-25 parts of carbon fiber.
3. The high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 90-100 parts of polypropylene, 25-30 parts of graphite, 35-40 parts of magnetic particles, 10-15 parts of coupling agent, 14-25 parts of flame retardant and 18-25 parts of carbon fiber.
4. The preparation method of the high-conductivity high-flame-retardant polypropylene electromagnetic shielding composite material is characterized by comprising the following steps of:
s1: preparing materials: selecting polypropylene, graphite, magnetic particles and a coupling agent as raw materials for preparation by professionals, and processing the selected raw materials;
s2: material treatment: putting the processed raw materials into a stirrer for stirring, and putting the raw materials into a high-temperature smelting furnace for mixing and heating after stirring;
s3: preparing a product: granulating the molten liquid formed after heating, and putting the granulated liquid into a mould for extrusion forming to prepare the polypropylene electromagnetic shielding composite material;
s4: and (3) processing: carrying out surface treatment and laser punching on the prepared polypropylene electromagnetic shielding composite material;
s5: real-time monitoring: the polypropylene electromagnetic shielding composite material is monitored manually in real time in the preparation process, and is processed according to the monitoring result.
5. The method for preparing a highly conductive and flame retardant polypropylene electromagnetic shielding composite material according to claim 4, wherein in S1, a professional selects polypropylene, graphite, magnetic particles and a coupling agent as raw materials for preparation, and treats the selected raw materials, wherein the selected raw materials are crushed by a crusher in a unified specification, the crushing specification is manually set, the polypropylene is soaked in a bromine-containing alkyl phosphate solution for 30min after the crushing is completed, and the polypropylene is dried in an oven after the soaking is completed, wherein the drying temperature is kept at 80-100 ℃ during the drying, and the drying time is kept at 20-30min.
6. The method for preparing a highly conductive and flame retardant polypropylene electromagnetic shielding composite material according to claim 4, wherein in the step S2, the processed raw materials are put into a stirrer for stirring, wherein the stirrer speed is 6r/min, the stirring time is 20-30min, and the raw materials are manually prepared before stirring, wherein the raw materials are used according to the mass ratio of polypropylene: graphite: magnetic particles: the coupling agent is 8.
7. The method for preparing a highly conductive and flame retardant polypropylene electromagnetic shielding composite material as claimed in claim 4, wherein in S3, the melt after heating is fed into a pelletizer and extruded and pelletized by the pelletizer, wherein the internal temperature is kept above 400 ℃ when the pelletizer is used for pelletizing, and after the pelletization, the polypropylene electromagnetic shielding composite material is prepared by putting composite material particles into a die and extruding and molding the composite material particles by an extruder, wherein the die is manually preheated before the composite particles are put into the die, and the preheating temperature reaches 300 ℃ and the composite particles are put into the die.
8. The method for preparing a high-conductivity high-flame-retardance polypropylene electromagnetic shielding composite material according to claim 4, wherein in S4, the surface of the prepared polypropylene electromagnetic shielding composite material is coated with a flame retardant for surface treatment, a stepped coating method is adopted during coating, natural air drying treatment is firstly carried out after one-time coating is finished, whether the air drying treatment is finished or not is judged manually, treatment is carried out according to a judgment result, secondary coating is carried out if the air drying treatment is finished, air drying treatment is continued if the air drying treatment is not finished, the surface coating times are 3-5 times, the polypropylene electromagnetic shielding composite material is filled with carbon fibers after the surface treatment is finished, carbon fibers are coated on the surfaces of the adopted carbon fibers and ultrafine graphite particles are deposited, the prepared polypropylene electromagnetic shielding composite material is subjected to laser punching by a numerical control machine tool after the filling is finished, and when the laser punching is carried out, the shape and thickness data of the polypropylene electromagnetic shielding composite material are manually set for the numerical control machine tool according to customer requirements.
9. The method for preparing the highly conductive and flame retardant polypropylene electromagnetic shielding composite material as claimed in claim 4, wherein in step S5, the polypropylene electromagnetic shielding composite material is manually monitored in real time during the preparation process, wherein the real-time monitoring is performed by manually observing the temperature data in real time through an electronic display screen of the temperature sensor and processing the temperature data through the observation result, the observation result shows that the temperature data of the electronic display screen is in the specified temperature range, the temperature data is periodically recorded by manually recording the temperature data, wherein the recording interval time is 0.5h, the observation result shows that the temperature data of the electronic display screen is not in the specified temperature range, the temperature data of the electronic display screen is judged and processed by manually passing through the electronic display screen, wherein the temperature data of the electronic display screen is closed by manually closing the heat source inlet when exceeding the specified temperature range, the electronic display screen is opened again until the temperature data of the electronic display screen is restored to the specified temperature range, and the heat source inlet is inspected when the temperature data of the electronic display screen is lower than the specified temperature range, and the blockage at the heat source inlet is removed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117554873A (en) * | 2023-11-13 | 2024-02-13 | 中山大学附属第一医院 | Passive shimming filling device and shimming filling method for magnetic resonance imaging equipment |
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| US20130299732A1 (en) * | 2012-05-08 | 2013-11-14 | Hyundai Motor Company | Hybrid filler for electromagnetic shielding composite material and method of manufacturing the hybrid filler |
| CN109135056A (en) * | 2018-07-27 | 2019-01-04 | 会通新材料股份有限公司 | A kind of novel low-odor electromagnetic shielding polypropylene composite material and preparation method |
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| CN103304888A (en) * | 2012-03-06 | 2013-09-18 | 上海杰事杰新材料(集团)股份有限公司 | Electromagnetic shielding polypropylene composite material, and preparation method and purpose thereof |
| US20130299732A1 (en) * | 2012-05-08 | 2013-11-14 | Hyundai Motor Company | Hybrid filler for electromagnetic shielding composite material and method of manufacturing the hybrid filler |
| CN109135056A (en) * | 2018-07-27 | 2019-01-04 | 会通新材料股份有限公司 | A kind of novel low-odor electromagnetic shielding polypropylene composite material and preparation method |
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