Search

CN-122011498-A - PMMA recyclable wave-absorbing buoyancy material and preparation method thereof

CN122011498ACN 122011498 ACN122011498 ACN 122011498ACN-122011498-A

Abstract

The invention provides a PMMA recyclable wave-absorbing buoyancy material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The preparation method comprises the steps of adding an initiator into PMMA liquid resin with certain viscosity, introducing hollow microspheres into the resin as light filler and closed-pore structural units, adding a proper amount of wave absorber, and performing in-situ polymerization, solidification and molding in a mold. The invention realizes the electromagnetic wave absorption and buoyancy bearing functions cooperatively by constructing a low-density closed-pore polymer composite system. The density of the prepared material is lower than that of water, the material has long-term buoyancy, and stable wave absorbing performance (RL is less than or equal to-10 dB) is obtained under the premise of ensuring good impedance matching through the interface polarization and multiple scattering effects.

Inventors

  • Ren Mengshuai
  • ZHANG JIANMIN
  • ZHOU LEI
  • LI SIQING
  • ZHANG QIONG

Assignees

  • 中国科学院过程工程研究所
  • 郑州中科新兴产业技术研究院
  • 龙子湖新能源实验室

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The preparation method of the PMMA recyclable wave-absorbing buoyancy material is characterized by comprising the following steps of: 1) Polymethyl methacrylate and acrylic resin monomers react under the action of a free radical initiator to obtain PMMA liquid resin with certain viscosity; 2) Adding the hollow microspheres and the wave absorber into PMMA liquid resin for dispersion treatment to obtain suspension slurry; 3) And (3) solidifying and forming the mixed material in a mould to obtain the PMMA recyclable wave-absorbing buoyancy material.
  2. 2. The method for preparing a PMMA recoverable wave absorbing buoyancy material of claim 1, wherein the acrylic monomer comprises methyl methacrylate and/or methacrylic acid; The mass ratio of the polymethyl methacrylate to the acrylic resin monomer is 5-30:70-95.
  3. 3. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to claim 2, wherein the free radical initiator comprises a thermal initiator or a photoinitiator; the addition amount of the free radical initiator is 1-5% of the total mass of polymethyl methacrylate and acrylic resin monomers.
  4. 4. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to any one of claims 1 to 3, wherein in the step 1), the reaction temperature is 30 to 45 ℃ and the reaction time is 10 to 20 hours.
  5. 5. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to claim 1, wherein the polymethyl methacrylate has a number average molecular weight of more than or equal to 80000.
  6. 6. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to claim 4, wherein the hollow microspheres comprise one or more of hollow glass microspheres, hollow silicon carbide microspheres, hollow ceramic microspheres, hollow plastic microspheres, hollow metal microspheres and hollow carbon microspheres, and the addition amount of the hollow microspheres is 5-30% of the total mass of the PMMA recyclable wave-absorbing buoyancy material.
  7. 7. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to claim 6, wherein the hollow microspheres are of a closed-cell structure, and the tap density is 0.1-0.6 g/cm < 3 >.
  8. 8. The method for preparing the PMMA recyclable wave-absorbing buoyancy material according to claim 1, 6 or 7, wherein the wave-absorbing agent comprises one or more of a carbon-based wave-absorbing agent, a metal-based wave-absorbing agent and a magnetic wave-absorbing agent, and the adding amount of the wave-absorbing agent is 1-30% of the total mass of the PMMA recyclable wave-absorbing buoyancy material.
  9. 9. The preparation method of the PMMA recyclable wave-absorbing buoyancy material according to claim 8 is characterized in that the curing and forming conditions are that heat preservation is carried out for 8-12 hours at 30-40 ℃, then heat preservation is carried out for 1-3 hours at 70-90 ℃ and curing is completed.
  10. 10. The PMMA recyclable wave-absorbing buoyancy material prepared by the preparation method of any one of claims 1-9.

Description

PMMA recyclable wave-absorbing buoyancy material and preparation method thereof Technical Field The invention relates to the technical field of polymer composite materials, in particular to a PMMA recyclable wave-absorbing buoyancy material and a preparation method thereof. Background With the rapid development of modern electronic information technology, electromagnetic waves are increasingly widely applied in the fields of communication, civil use and the like, and the problems of electromagnetic interference (EMI) and electromagnetic radiation pollution are also increasingly serious. The wave absorbing material is used as a functional material capable of effectively absorbing and dissipating electromagnetic wave energy, and plays a vital role in electromagnetic compatibility, object stealth, electronic equipment protection and the like. In the wading application scenes such as ocean monitoring, underwater communication, offshore platforms and the like, new requirements are put forward on functional materials. The apparatus is required to have not only excellent electromagnetic wave absorption performance but also capability of floating on the water surface or a specific water layer for a long period of time, i.e., low density and high buoyancy characteristics. Traditional wave absorbing materials, such as ferrite, metal magnetic powder and the like, have excellent wave absorbing performance, but generally have higher density (generally more than 3g/cm 3), and are difficult to meet the requirement of buoyancy application. After the composite material is compounded with a polymer matrix, the overall density of the material is still higher, additional buoyancy structural support is needed, and the complexity and the cost of the system are increased. To solve the above problems, researchers have developed various light wave absorbing materials. For example, buoyancy materials with certain wave absorbing capacity can be prepared by introducing wave absorbing agents (such as carbon nanotubes, graphene, carbonyl iron powder and the like) into lightweight porous matrixes such as polyurethane foam, epoxy resin foam and the like. However, the materials generally have the defects that firstly, the matrix is mostly thermosetting resin, an irreversible network structure is formed after crosslinking and solidification, so that once the materials are damaged or abandoned, the materials are difficult to recover and recycle, and resource waste and white pollution are caused, secondly, the open-cell foam structure is easy to absorb water, so that buoyancy performance is reduced with time, meanwhile, the dielectric performance of the materials is deteriorated due to the invasion of water, the wave absorption stability is influenced, and thirdly, a higher-content wave absorber is required to be added for realizing effective wave absorption, so that the density of the materials is increased, impedance matching is possibly damaged, and the wave absorption performance is poor. Therefore, a novel composite material integrating low density, excellent wave absorbing performance, long-term buoyancy stability and green recyclable property is developed, and has important theoretical significance and practical value for promoting the application of the wave absorbing material in the fields of ocean and the like. The prior art does not provide a comprehensive solution which can perfectly coordinate the above performances, in particular to a comprehensive solution with high efficiency and convenient recycling capability. Disclosure of Invention The invention aims to provide a PMMA recyclable wave-absorbing buoyancy material and a preparation method thereof, and the method aims to solve the technical problems of how to prepare a composite material which has lower density than water, stable wave-absorbing performance and water erosion resistance and can be recycled by both a matrix and a functional filler. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a preparation method of a PMMA recyclable wave-absorbing buoyancy material, which comprises the following steps: 1) Polymethyl methacrylate and acrylic resin monomers react under the action of a free radical initiator to obtain PMMA liquid resin with certain viscosity; 2) Adding the hollow microspheres and the wave absorber into PMMA liquid resin for dispersion treatment to obtain suspension slurry; 3) And (3) solidifying and forming the mixed material in a mould to obtain the PMMA recyclable wave-absorbing buoyancy material. Further, the acrylic monomer comprises methyl methacrylate and/or methacrylic acid; The mass ratio of the polymethyl methacrylate to the acrylic resin monomer is 5-30:70-95. Further, the free radical initiator comprises a thermal initiator or a photoinitiator; the addition amount of the free radical initiator is 1-5% of the total mass of polymethyl methacrylate and acrylic resin monomers.