CN117164933A - Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof - Google Patents
Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof Download PDFInfo
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- CN117164933A CN117164933A CN202311294264.8A CN202311294264A CN117164933A CN 117164933 A CN117164933 A CN 117164933A CN 202311294264 A CN202311294264 A CN 202311294264A CN 117164933 A CN117164933 A CN 117164933A
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- wave
- absorbing material
- polystyrene foam
- absorbing
- expanded polystyrene
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- 239000011358 absorbing material Substances 0.000 title claims abstract description 45
- 229920006327 polystyrene foam Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 230000010287 polarization Effects 0.000 title claims description 25
- 239000011324 bead Substances 0.000 claims abstract description 72
- 239000004794 expanded polystyrene Substances 0.000 claims abstract description 63
- 239000011248 coating agent Substances 0.000 claims abstract description 52
- 238000000576 coating method Methods 0.000 claims abstract description 52
- 238000012986 modification Methods 0.000 claims abstract description 27
- 230000004048 modification Effects 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000465 moulding Methods 0.000 claims abstract description 19
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 17
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 15
- 239000003063 flame retardant Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000006258 conductive agent Substances 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 10
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 229920000877 Melamine resin Polymers 0.000 claims description 6
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920001721 polyimide Polymers 0.000 claims description 6
- 239000009719 polyimide resin Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000009736 wetting Methods 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000007822 coupling agent Substances 0.000 claims description 4
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 claims description 4
- 239000004114 Ammonium polyphosphate Substances 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims description 2
- 229920001276 ammonium polyphosphate Polymers 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- WHHGLZMJPXIBIX-UHFFFAOYSA-N decabromodiphenyl ether Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1OC1=C(Br)C(Br)=C(Br)C(Br)=C1Br WHHGLZMJPXIBIX-UHFFFAOYSA-N 0.000 claims description 2
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- -1 polydimethylsiloxane Polymers 0.000 claims description 2
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 239000006260 foam Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Abstract
The application discloses a polystyrene foam wave-absorbing material with a modified surface polarity and a preparation method thereof, which relate to the technical field of wave-absorbing materials and specifically comprise the following steps: s01: preparing a wave-absorbing coating; s02: coating; s03: carrying out polarity modification; s04: molding. According to the application, the surface of the expanded polystyrene beads is coated with the wave-absorbing coating before molding, then the expanded polystyrene beads are subjected to polar modification, and then the molded product is sintered by heating, so that molecular chains containing polar groups on the surfaces of the expanded polystyrene beads start to move freely and are mutually entangled during heating, and the surfaces of the beads are sintered mutually, so that the surface of the expanded polystyrene beads obtained after the polar modification is firmer in sintering, higher in strength and more durable in material.
Description
Technical Field
The application relates to the technical field of wave-absorbing materials, in particular to a polystyrene foam wave-absorbing material with a modified surface polarity and a preparation method thereof.
Background
With the continuous development of the electronic information age, the market demand for anechoic chambers for detection is also growing. The wave absorbing material is particularly critical as the core of the wave absorbing darkroom, and the current gradual development in China shows the trend that the rigid foam wave absorbing material replaces the traditional polyurethane wave absorbing material, which is related to the disadvantages of easiness in wetting the head hanging, slag falling of the wave absorbing agent and the like of the polyurethane foam. Among the rigid foam wave absorbing materials, the recently developed polystyrene foam wave absorbing material is increasingly popular in the market due to its lighter weight and more durable nature.
Over decades, although the molding of expanded polystyrene beads has been mature, and the molding process using high pressure steam as the heating medium has been adequate for typical foam packages, it is evident that the current state of the art is still not fully satisfactory for demanding wave absorbing materials.
The prior art has the following defects: in the polystyrene foam wave-absorbing material in the prior art, on one hand, from the aspect of the molecular structure of polystyrene, inherent benzene ring side groups on molecular chains prevent the mutual entanglement of molecular chains when the expanded polystyrene beads are sintered mutually, so that the expanded polystyrene beads are not firmly adhered and are easy to separate, and a finished piece is easy to break; on the other hand, the wave-absorbing coating wrapped on the surface of the expanded polystyrene beads further weakens the molecular polarity on the surface of the expanded polystyrene beads, and the strength of the corresponding foam parts is further weakened, so that the performance and quality of the wave-absorbing material are unstable. Therefore, a polystyrene foam wave-absorbing material with a modified surface polarization and a preparation method thereof are provided by the person skilled in the art to solve the problems in the prior art.
Disclosure of Invention
The application aims to provide a polystyrene foam wave-absorbing material with a modified surface polarization and a preparation method thereof, so as to solve the problems in the background art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the preparation method of the polystyrene foam wave-absorbing material with the surface modified by polarity specifically comprises the following steps:
s01: preparing a wave-absorbing coating: preparing the required raw materials of conductive agent, flame retardant, film forming agent and deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating;
s02: coating: putting the expanded polystyrene beads into the wave-absorbing coating, fully stirring and drying to obtain expanded polystyrene beads coated with the wave-absorbing coating on the surfaces;
s03: and (3) polarization modification: putting the expanded polystyrene beads coated with the wave-absorbing coating on the surface into surface modifying liquid to carry out surface polarity modification, rapidly stirring and simultaneously heating to 55-65 ℃, keeping the temperature for 40-60 min, and drying the moisture after full wetting to obtain expanded polystyrene beads with polar groups on the surface;
s04: molding: the polystyrene foam wave-absorbing material with a specific structure is obtained by heating, sintering, molding and forming the polystyrene foam beads after the polarization modification;
wherein the polar group is octadecyl methacrylate.
Further, in S04 molding, the heating means may be radio wave heating, high-pressure steam heating, or high-temperature hot air heating.
Preferably, the heating mode is radio wave heating, the heating mode can prevent water from passing through the inside of a product and taking away substances on the surface of the product, and the electric wave heating forming is adopted, no waste water is generated, the energy is saved, the environment is protected, dipole molecules in polar groups on the surface of the expanded polystyrene beads are subjected to friction heating under the action of an alternating electromagnetic field after radio is applied, and the surfaces of the beads are sintered with each other.
In the application, during S04 molding, polar molecular chains on the surface of the expanded polystyrene beads obtained through polar modification are mutually entangled, so that the beads are sintered more firmly and have higher strength. According to the application, the surface of the expanded polystyrene beads is modified in a polar manner, and meanwhile, a wave-absorbing coating is introduced to the surface of the beads.
As a further scheme of the application: the diameter of the expanded polystyrene beads is 3-7 mm, and the bulk density is 15-60 kg/m 3 。
As still further aspects of the application: the surface modification liquid comprises the following components in percentage by weight: 30-70% of octadecyl methacrylate, 0.1-1% of coupling agent and the balance of deionized water.
As still further aspects of the application: the coupling agent is titanate.
As still further aspects of the application: the mass ratio of the expanded polystyrene beads to the surface modifying liquid to the wave-absorbing coating is 100: 30-60: 60 to 100.
As still further aspects of the application: the wave-absorbing coating comprises the following components in percentage by weight: 5-30% of conductive agent, 10-45% of flame retardant, 20-35% of film forming agent and the balance of deionized water.
As still further aspects of the application: the conductive agent includes, but is not limited to, conductive carbon black, carbon nanotubes, graphene, conductive silver powder, conductive fibers.
Preferably, the conductive agent is conductive carbon black.
As still further aspects of the application: the flame retardant includes, but is not limited to, melamine, triphenyl phosphate, ammonium polyphosphate, magnesium hydroxide, aluminum hydroxide, decabromodiphenyl ether, and zinc borate.
Preferably, the flame retardant is melamine or triphenyl phosphate.
As still further aspects of the application: the film forming agents include, but are not limited to, polyimide resins, polyglycerol-diisostearate, polyglycerol-triisostearate, and polydimethylsiloxane.
Preferably, the film former is a polyimide resin.
A polystyrene foam wave-absorbing material with a modified surface polarity is prepared by the preparation method.
Compared with the prior art, the application has the beneficial effects that: according to the application, the surface of the expanded polystyrene beads is coated with the wave-absorbing coating before molding, then the expanded polystyrene beads are subjected to polar modification, and then the molded product is sintered by heating, so that molecular chains containing polar groups on the surfaces of the expanded polystyrene beads start to move freely and are mutually entangled during heating, and the surfaces of the beads are sintered mutually, so that the surface of the expanded polystyrene beads obtained after the polar modification is firmer in sintering, higher in strength and more durable in material.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all of the features of the technology disclosed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic cross-sectional view of a surface-polarization-modified expanded polystyrene bead provided in an embodiment of the present application;
fig. 2 is a schematic perspective view of a surface polarization modified polystyrene foam wave absorbing material according to an embodiment of the present application.
Reference numerals illustrate:
1. expanded polystyrene beads; 2. a wave-absorbing coating; 3. polar groups.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1-2, in an embodiment of the present application,
example 1
The preparation method of the polystyrene foam wave-absorbing material with the surface modified by polarity specifically comprises the following steps:
s01: preparing a wave-absorbing coating: the method comprises the steps of preparing 6% of required raw materials, 14% of flame retardant, 25% of film forming agent and 55% of deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating, wherein the conductive agent is conductive carbon black, the flame retardant is melamine, and the film forming agent is polyimide resin.
S02: coating: adding the expanded polystyrene beads 1 into the wave-absorbing coating, fully stirring and drying to obtain the expanded polystyrene beads 1 coated with the wave-absorbing coating 2, wherein the diameter of the expanded polystyrene beads 1 is 3mm, and the stacking density is 15kg/m 3 The mass ratio of the expanded polystyrene beads 1 to the wave-absorbing coating is 100:80;
s03: and (3) polarization modification: adding the expanded polystyrene beads 1 coated with the wave-absorbing coating 2 on the surface into a surface modification liquid to carry out surface polarity modification, rapidly stirring, heating to 60 ℃ at the same time, keeping the temperature for 55min, and drying the moisture after full wetting to obtain expanded polystyrene beads with polar groups 3 on the surface, wherein the polar groups 3 are octadecyl methacrylate; the mass ratio of the expanded polystyrene beads 1 to the surface modifying liquid is 100:50; the surface modifying liquid comprises the following components in percentage by weight: 50% of octadecyl methacrylate, 0.2% of titanate and 49.8% of deionized water;
s04: molding: and (3) heating, sintering and molding the expanded polystyrene beads 1 subjected to the polarization modification by radio waves to obtain the wedge-shaped polystyrene foam wave-absorbing material.
The wedge-shaped wave-absorbing material prepared by the embodiment of the application has the size of 600 multiplied by 150mm, and the specific shape is shown in figure 2.
Example 2
The preparation method of the polystyrene foam wave-absorbing material with the surface modified by polarity specifically comprises the following steps:
s01: preparing a wave-absorbing coating: preparing 15% of a required raw material conductive agent, 25% of a flame retardant, 30% of a film forming agent and 30% of deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating, wherein the conductive agent is conductive carbon black, the flame retardant is triphenyl phosphate, and the film forming agent is polyglycerol-diisostearate;
s02: coating: adding the expanded polystyrene beads 1 into the wave-absorbing coating, fully stirring and drying to obtain the expanded polystyrene beads 1 coated with the wave-absorbing coating 2, wherein the diameter of the expanded polystyrene beads 1 is 5mm, and the bulk density is 30kg/m 3 The mass ratio of the expanded polystyrene beads 1 to the wave-absorbing coating is 100:60;
s03: and (3) polarization modification: putting the expanded polystyrene beads 1 with the wave-absorbing coating 2 coated on the surface into a surface modifying liquid to carry out surface polarity modification, rapidly stirring and simultaneously heating to 55 ℃, keeping the temperature for 40min, and drying the moisture after full wetting to obtain expanded polystyrene beads 1 with polar groups 3 on the surface, wherein the polar groups 3 are octadecyl methacrylate; the mass ratio of the expanded polystyrene beads 1 to the surface modifying liquid is 100:40, the surface modifying liquid comprises the following components in percentage by weight: 30% of octadecyl methacrylate, 0.1% of titanate and 69.9% of deionized water;
s04: molding: the expanded polystyrene beads 1 after the polarization modification are heated by radio waves, sintered, molded and formed to obtain a wedge-shaped polystyrene foam wave-absorbing material;
example 3
The preparation method of the polystyrene foam wave-absorbing material with the surface modified by polarity specifically comprises the following steps:
s01: preparing a wave-absorbing coating: preparing 25% of required raw materials of conductive agent, 40% of flame retardant, 30% of film forming agent and 5% of deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating, wherein the conductive agent is conductive carbon black, the flame retardant is melamine, and the film forming agent is polyimide resin;
s02: coating: to foam polystyreneThe olefin beads 1 are put into the wave-absorbing coating, fully stirred and dried to obtain the expanded polystyrene beads 1 with the surfaces coated with the wave-absorbing coating 2, wherein the diameter of the expanded polystyrene beads is 7mm, and the bulk density is 60kg/m 3 The mass ratio of the expanded polystyrene beads 1 to the wave-absorbing coating is 100:100;
s03: and (3) polarization modification: putting the expanded polystyrene beads 1 with the wave-absorbing coating 1 coated on the surface into a surface modifying liquid to carry out surface polarity modification, rapidly stirring, heating to 65 ℃ at the same time, keeping the temperature for 60 minutes, and drying the moisture after full wetting to obtain expanded polystyrene beads 1 with polar groups 3 on the surface, wherein the polar groups 3 are octadecyl methacrylate; the mass ratio of the expanded polystyrene beads 1 to the surface modifying liquid is 100:60, the surface modifying liquid comprises the following components in percentage by weight: 70% of octadecyl methacrylate, 1% of titanate and 29% of deionized water;
s04: molding: the expanded polystyrene beads 1 after the polarization modification are heated by radio waves, sintered, molded and formed to obtain a wedge-shaped polystyrene foam wave-absorbing material;
comparative example
The method specifically comprises the following steps:
s01: preparing a wave-absorbing coating: the method comprises the steps of preparing 6% of required raw materials, 14% of flame retardant, 25% of film forming agent and 55% of deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating, wherein the conductive agent is conductive carbon black, the flame retardant is melamine, and the film forming agent is polyimide resin.
S02: coating: adding the expanded polystyrene beads 1 into the wave-absorbing coating, fully stirring and drying to obtain the expanded polystyrene beads 1 coated with the wave-absorbing coating 2, wherein the diameter of the expanded polystyrene beads 1 is 3mm, and the stacking density is 15kg/m 3 The mass ratio of the expanded polystyrene beads 1 to the wave-absorbing coating is 100:80;
s03: molding: and heating, sintering and molding the expanded polystyrene beads 1 coated with the wave-absorbing coating 2 to obtain the wedge-shaped polystyrene foam wave-absorbing material.
Experimental example
Physical properties of the wedge-shaped polystyrene foam wave-absorbing materials prepared in the above examples 1 to 3 and comparative examples were tested, and the test results are shown in Table 1 below.
TABLE 1 physical Property test
| Project | Weight/kg | Limiting oxygen index/% | Tensile Strength/kPa |
| Comparative example | 1.14 | 28.5 | 96 |
| Example 1 | 1.12 | 29 | 125 |
| Example 2 | 1.15 | 30 | 128 |
| Example 3 | 1.16 | 31 | 127 |
From this, it is evident that the wave-absorbing materials prepared in examples 1 to 3 have more excellent tensile strength than the comparative examples, indicating that the expanded polystyrene beads modified by surface polarization have more excellent sintering properties.
The wedge-shaped polystyrene foam wave-absorbing materials prepared in the above examples 1 to 3 and comparative examples were subjected to a reflection loss performance test, and the test results are shown in Table 2 below.
Table 2 reflection loss performance test
| Project | 0.2GHz | 0.5GHz | 1GHz | 6GHz | 18GHz | 26GHz | 40GHz |
| Comparative example | -8dB | -17dB | -24dB | -26dB | -29dB | -27dB | -38dB |
| Example 1 | -12dB | -19dB | -29dB | -31dB | -31dB | -32dB | -43dB |
| Example 2 | -11dB | -20dB | -28dB | -30dB | -30dB | -32dB | -44dB |
| Example 3 | -13dB | -19dB | -30dB | -32dB | -32dB | -33dB | -45dB |
From this, it is clear that the product of the comparative example, which was not subjected to the polarization modification, had a relatively poor reflectivity compared to the product of examples 1 to 3 because it was likely that a very perfect conductive network was not formed inside, and the wave-absorbing materials prepared in examples 1 to 3 had more excellent wave-absorbing properties over a wider frequency range than the wave-absorbing materials of the comparative example.
According to the application, the surface of the expanded polystyrene bead 1 is coated with the wave-absorbing coating before molding, then the expanded polystyrene bead 1 is subjected to polar modification, and then the molded product is subjected to heating sintering molding, and when the molded product is heated, molecular chains containing polar groups 3 on the surface of the expanded polystyrene bead 1 start to move freely and intertwine with each other, so that the surfaces of the beads are sintered with each other, and the surface of the expanded polystyrene bead 1 obtained after the polar modification is firmer in sintering, higher in strength and more durable in material.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application 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.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A preparation method of a polystyrene foam wave-absorbing material with a modified surface polarity is characterized by comprising the following steps: the method specifically comprises the following steps:
s01: preparing a wave-absorbing coating: preparing the required raw materials of conductive agent, flame retardant, film forming agent and deionized water according to weight percentage, and fully mixing to obtain the wave-absorbing coating;
s02: coating: putting the expanded polystyrene beads into the wave-absorbing coating, fully stirring and drying to obtain expanded polystyrene beads coated with the wave-absorbing coating on the surfaces;
s03: and (3) polarization modification: putting the expanded polystyrene beads coated with the wave-absorbing coating on the surface into surface modifying liquid to carry out surface polarity modification, rapidly stirring and simultaneously heating to 55-65 ℃, keeping the temperature for 40-60 min, and drying the moisture after full wetting to obtain expanded polystyrene beads with polar groups on the surface;
s04: molding: the polystyrene foam wave-absorbing material with a specific structure is obtained by heating, sintering, molding and forming the polystyrene foam beads after the polarization modification;
wherein the polar group is octadecyl methacrylate.
2. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 1, which is characterized in that: the diameter of the expanded polystyrene beads is 3-7 mm, and the bulk density is 15-60 kg/m 3 。
3. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 1, which is characterized in that: the surface modification liquid comprises the following components in percentage by weight: 30-70% of octadecyl methacrylate, 0.1-1% of coupling agent and the balance of deionized water.
4. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 3, wherein the method comprises the following steps: the coupling agent is titanate.
5. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 1, which is characterized in that: the mass ratio of the expanded polystyrene beads to the surface modifying liquid to the wave-absorbing coating is 100: 30-60: 60 to 100.
6. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 1, which is characterized in that: the wave-absorbing coating comprises the following components in percentage by weight: 5-30% of conductive agent, 10-45% of flame retardant, 20-35% of film forming agent and the balance of deionized water.
7. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 6, which is characterized in that: the conductive agent includes, but is not limited to, conductive carbon black, carbon nanotubes, graphene, conductive silver powder, conductive fibers.
8. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 6, which is characterized in that: the flame retardant includes, but is not limited to, melamine, triphenyl phosphate, ammonium polyphosphate, magnesium hydroxide, aluminum hydroxide, decabromodiphenyl ether, and zinc borate.
9. The method for preparing the polystyrene foam wave-absorbing material with the modified surface polarization according to claim 6, which is characterized in that: the film forming agents include, but are not limited to, polyimide resins, polyglycerol-diisostearate, polyglycerol-triisostearate, and polydimethylsiloxane.
10. A polystyrene foam wave-absorbing material with a modified surface polarity is characterized in that: the method for producing a surface-polarization-modified polystyrene foam wave-absorbing material according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311294264.8A CN117164933B (en) | 2023-10-09 | 2023-10-09 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311294264.8A CN117164933B (en) | 2023-10-09 | 2023-10-09 | Polystyrene foam wave-absorbing material with surface modified by polarization and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN117164933A true CN117164933A (en) | 2023-12-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9625975D0 (en) * | 1995-12-15 | 1997-01-29 | Ams Polymers Pty Ltd | Absorbing materials |
| CN103408788A (en) * | 2013-08-06 | 2013-11-27 | 南京洛普电子工程研究所 | Flame-retardance wave-absorbing polystyrene foam material and preparation method thereof |
| CN106495618A (en) * | 2016-11-10 | 2017-03-15 | 过冬 | A kind of magnetic inhales ripple cement structures |
| CN107417948A (en) * | 2017-06-14 | 2017-12-01 | 大连东信微波技术有限公司 | A kind of absorbing material and preparation method thereof |
| US20200331178A1 (en) * | 2019-04-18 | 2020-10-22 | Herlin Up Co., LTD. | Microwave and Electromagnetic Heated Foaming Method, Mold and Foaming Material Thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9625975D0 (en) * | 1995-12-15 | 1997-01-29 | Ams Polymers Pty Ltd | Absorbing materials |
| CN103408788A (en) * | 2013-08-06 | 2013-11-27 | 南京洛普电子工程研究所 | Flame-retardance wave-absorbing polystyrene foam material and preparation method thereof |
| CN106495618A (en) * | 2016-11-10 | 2017-03-15 | 过冬 | A kind of magnetic inhales ripple cement structures |
| CN107417948A (en) * | 2017-06-14 | 2017-12-01 | 大连东信微波技术有限公司 | A kind of absorbing material and preparation method thereof |
| US20200331178A1 (en) * | 2019-04-18 | 2020-10-22 | Herlin Up Co., LTD. | Microwave and Electromagnetic Heated Foaming Method, Mold and Foaming Material Thereof |
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