CN113801396A - White foamed polymer wave-absorbing material and preparation method thereof - Google Patents
White foamed polymer wave-absorbing material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a white foaming polymer wave-absorbing material and a preparation method thereof, wherein the white foaming polymer wave-absorbing material comprises the following raw materials in parts by weight: 48-52 parts of conductive titanium dioxide, 19-21 parts of a dispersing agent, 5 parts of a lubricating agent, 9-11 parts of carbon fiber and 79-90 parts of polypropylene; comprising the following preparation steps, S1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture; s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, and respectively adding the mixture and the polypropylene into an internal mixer for internal mixing. The white or gray foamed polymer wave-absorbing material disclosed by the invention is not required to be additionally provided with a white reflector when being installed in an electromagnetic shielding darkroom, namely a white cap, so that the illumination in a laboratory is not influenced, the white or gray foamed polymer wave-absorbing material is cleaner, meanwhile, the construction cost is also reduced, and the white or gray foamed polymer wave-absorbing material is economic and environment-friendly and is beneficial to actual use.
Description
Technical Field
The invention relates to a white foamed polymer wave-absorbing material, in particular to a white foamed polymer wave-absorbing material and a preparation method thereof.
Background
The wave-absorbing material is a material which can absorb most of electromagnetic waves projected on the surface of the wave-absorbing material and convert the electromagnetic waves into other forms of energy without reflection. The wave-absorbing material has wide and important application in the fields of broadcast television, electronic appliances, microwave radiation protection and the like.
At present, when an existing electromagnetic shielding dark room is constructed, a wave-absorbing material generally only can be foamed polypropylene and foamed polystyrene, and is a black product, and due to the black characteristic, the wave-absorbing material has strong absorption to visible light, so that a layer of white cap is often required to be attached to the outer side of the wave-absorbing material to increase the brightness in the dark room during testing, so that extra cost is added to construction, extra safety risks are increased, and improvement is required.
Disclosure of Invention
The invention aims to provide a white foaming polymer wave-absorbing material and a preparation method thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a white foaming polymer wave-absorbing material comprises the following raw materials in parts by weight:
48-52 parts of conductive titanium dioxide, 19-21 parts of a dispersing agent, 5 parts of a lubricating agent, 9-11 parts of carbon fiber and 79-90 parts of polypropylene.
As a further scheme of the invention: 48-52 parts of conductive titanium dioxide, 19-21 parts of a dispersing agent, 5 parts of a lubricating agent, 9-11 parts of carbon fiber and 79-90 parts of polypropylene.
The preparation method of the white foaming polymer wave-absorbing material comprises the following preparation steps;
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
As a further scheme of the invention: in the step S1, the rotating speed of the high-speed mixer is 1200rpm/min, and when the mixture is poured into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricating agent and the carbon fiber are added in sequence.
As a further scheme of the invention: in the step S2, the working temperature of the internal mixer is 100 ℃ and 130 ℃, and the model of the internal mixer is QL-ML 52.
As a further scheme of the invention: in the step S3, the screw hole for discharging in the screw extruder has an inner diameter of 0.5 to 3.0mm, the length of the pellet is 0.5 to 5mm, and the weight of the pellet is 0.5 to 5 mg.
As a further scheme of the invention: in the step S4, the pressure in the foaming reactor was 20Mpa, and the temperature in the foaming reactor was 240 ℃.
As a further scheme of the invention: in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional sponge wave absorbing body, the white or gray foamed polymer wave absorbing material is simpler and more environment-friendly in preparation and more uniform in wave absorbing performance, and meanwhile compared with the traditional wave absorbing material prepared from polystyrene and polypropylene foamed beads, the white or gray foamed polymer wave absorbing material disclosed by the invention does not need to be additionally provided with a white reflector, namely a white cap, when being installed in an electromagnetic shielding dark room, so that the illumination in a laboratory is not influenced, the white or gray foamed polymer wave absorbing material is cleaner, meanwhile, the construction cost is also reduced, the white foamed polymer wave absorbing material is economic and environment-friendly, and is beneficial to actual use.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a 100kHz-1GHz wave-absorbing performance test chart of a white foamed polymer wave-absorbing 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 with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a white foaming polymer wave-absorbing material, which comprises the following raw materials in parts by weight:
50 parts of conductive titanium dioxide, 20 parts of a dispersing agent, 5 parts of a lubricating agent, 10 parts of carbon fiber and 85 parts of polypropylene.
The preparation method comprises the following steps:
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
Further, in the step S1, the rotation speed of the high-speed mixer is 1200rpm/min, and when pouring into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricant and the carbon fiber are added in this order.
Further, in the step S2, the operating temperature of the internal mixer is 130 ℃, and the internal mixer is of a model QL-ML 52.
Further, in the S3 step, the screw hole inner diameter for discharging in the screw extruder was 3.0mm, the length of the pellet was 5mm, and the weight of the pellet was 5 mg.
Further, in the step S4, the pressure in the foaming reactor is 20Mpa, and the temperature in the foaming reactor is 240 ℃.
Further, in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
The second embodiment of the invention provides a white foaming polymer wave-absorbing material, which comprises the following raw materials in parts by weight:
52 parts of conductive titanium dioxide, 21 parts of a dispersing agent, 5 parts of a lubricating agent, 11 parts of carbon fiber and 90 parts of polypropylene.
The preparation method comprises the following steps:
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
Further, in the step S1, the rotation speed of the high-speed mixer is 1200rpm/min, and when pouring into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricant and the carbon fiber are added in this order.
Further, in the step S2, the operating temperature of the internal mixer is 110 ℃, and the internal mixer is of a model of QL-ML 52.
Further, in the step S3, the inner diameter of the screw hole for discharging in the screw extruder was 1.0mm, the length of the pellet was 3mm, and the weight of the pellet was 4 mg.
Further, in the step S4, the pressure in the foaming reactor is 20Mpa, and the temperature in the foaming reactor is 240 ℃.
Further, in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
The third embodiment of the invention provides a white foamed polymer wave-absorbing material which comprises the following raw materials in parts by weight:
49 parts of conductive titanium dioxide, 19 parts of a dispersing agent, 5 parts of a lubricating agent, 9 parts of carbon fiber and 79 parts of polypropylene.
The preparation method comprises the following steps:
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
Further, in the step S1, the rotation speed of the high-speed mixer is 1200rpm/min, and when pouring into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricant and the carbon fiber are added in this order.
Further, in the step S2, the working temperature of the internal mixer is 100 ℃ and 130 ℃, and the model of the internal mixer is QL-ML 52.
Further, in the step S3, the inner diameter of the screw hole for discharging in the screw extruder was 2.0mm, the length of the pellet was 4mm, and the weight of the pellet was 4 mg.
Further, in the step S4, the pressure in the foaming reactor is 20Mpa, and the temperature in the foaming reactor is 240 ℃.
Further, in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
The embodiment of the invention provides a white foaming polymer wave-absorbing material, which comprises the following raw materials in parts by weight:
51 parts of conductive titanium dioxide, 21 parts of a dispersing agent, 5 parts of a lubricating agent, 11 parts of carbon fiber and 90 parts of polypropylene.
The preparation method comprises the following steps:
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
Further, in the step S1, the rotation speed of the high-speed mixer is 1200rpm/min, and when pouring into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricant and the carbon fiber are added in this order.
Further, in the step S2, the operating temperature of the internal mixer is 120 ℃, and the internal mixer is of a model QL-ML 52.
Further, in the step S3, the inner diameter of the screw hole for discharging in the screw extruder was 0.7mm, the length of the pellet was 0.9mm, and the weight of the pellet was 4 mg.
Further, in the step S4, the pressure in the foaming reactor is 20Mpa, and the temperature in the foaming reactor is 240 ℃.
Further, in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
The reflection coefficient and the transmission coefficient of the material are obtained through waveguide test, the electromagnetic absorption characteristics of the wave-absorbing material in the first to fourth embodiments are obtained through simple calculation, and the test result is shown in fig. 1.
As can be seen from the test results shown in FIG. 1, the present invention has good absorption effect in various wavelength bands.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A white foaming polymer wave-absorbing material is characterized by comprising the following raw materials in parts by weight:
48-52 parts of conductive titanium dioxide, 19-21 parts of a dispersing agent, 5 parts of a lubricating agent, 9-11 parts of carbon fiber and 79-90 parts of polypropylene.
2. The white foaming polymer wave-absorbing material of claim 1, which is characterized by comprising the following raw materials in parts by weight:
48-52 parts of conductive titanium dioxide, 19-21 parts of a dispersing agent, 5 parts of a lubricating agent, 9-11 parts of carbon fiber and 79-90 parts of polypropylene.
3. The preparation method of the white foaming polymer wave-absorbing material according to claim 1, which is characterized by comprising the following preparation steps;
s1: mixing, namely weighing the conductive titanium dioxide, the dispersing agent, the lubricating agent and the carbon fiber in proportion, storing in a temporary container, and then sequentially pouring into a high-speed mixer for mixing until the mixture is uniformly mixed, so as to take out the mixture;
s2: preparing conductive composite master batches, then weighing polypropylene according to a proportion, respectively adding the mixture and the polypropylene into an internal mixer for internal mixing, adding the mixture into a screw extruder for melting, plasticizing and granulating after the internal mixing, and finally obtaining the conductive composite master batches;
s3: preparing particles, namely quantitatively putting the conductive composite master batch into a screw extruder, extruding and granulating the materials by the screw extruder, and further preparing the particles;
s4: physical foaming, namely putting the particles, the dispersing agent and the emulsifying agent into a foaming reaction kettle, setting a certain temperature and gas pressure, and opening a valve of the reaction kettle to instantaneously release pressure after the foaming temperature and the foaming pressure reach set values, so that white foaming polypropylene beads with controllable multiplying power can be obtained;
s5: and (3) molding, namely molding the electromagnetic wave foam absorber with the required structure by using the white expanded polypropylene beads as molding raw materials.
4. The preparation method of the white foaming polymer wave-absorbing material according to claim 3, characterized in that: in the step S1, the rotating speed of the high-speed mixer is 1200rpm/min, and when the mixture is poured into the high-speed mixer for mixing, the dispersing agent, the conductive titanium dioxide, the lubricating agent and the carbon fiber are added in sequence.
5. The preparation method of the white foaming polymer wave-absorbing material according to claim 3, characterized in that: in the step S2, the working temperature of the internal mixer is 100 ℃ and 130 ℃, and the model of the internal mixer is QL-ML 52.
6. The preparation method of the white foaming polymer wave-absorbing material according to claim 3, characterized in that: in the step S3, the screw hole for discharging in the screw extruder has an inner diameter of 0.5 to 3.0mm, the length of the pellet is 0.5 to 5mm, and the weight of the pellet is 0.5 to 5 mg.
7. The preparation method of the white foaming polymer wave-absorbing material according to claim 3, characterized in that: in the step S4, the pressure in the foaming reactor was 20Mpa, and the temperature in the foaming reactor was 240 ℃.
8. The preparation method of the white foaming polymer wave-absorbing material according to claim 3, characterized in that: in step S5, the electromagnetic wave foam absorber is molded by white expanded polypropylene beads.
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| CN111333961A (en) * | 2020-04-24 | 2020-06-26 | 苏州申赛新材料有限公司 | Wave-absorbing material and preparation method thereof |
| CN112795178A (en) * | 2020-12-30 | 2021-05-14 | 金发科技股份有限公司 | High-strength polyamide wave-absorbing material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111333961A (en) * | 2020-04-24 | 2020-06-26 | 苏州申赛新材料有限公司 | Wave-absorbing material and preparation method thereof |
| CN112795178A (en) * | 2020-12-30 | 2021-05-14 | 金发科技股份有限公司 | High-strength polyamide wave-absorbing material and preparation method and application thereof |
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Application publication date: 20211217 |