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CN-122011727-A - Polyphenyl ether foaming material, preparation process and application

CN122011727ACN 122011727 ACN122011727 ACN 122011727ACN-122011727-A

Abstract

The invention discloses a polyphenyl ether foaming material, a preparation process and application thereof. The polyphenyl ether foaming material comprises, by mass, 60-80 parts of polyphenyl ether, 10-20 parts of high-density polyethylene, 5-15 parts of syndiotactic polystyrene, 2-5 parts of nano boron nitride, 1-5 parts of compatilizer, 1-3 parts of hyperbranched polyester and 0.5-2 parts of organic peroxide cross-linking agent. The foaming material has excellent wave-transmitting performance and stable dielectric property, can meet the signal transmission requirement in a high-frequency communication scene, has outstanding high-temperature resistance, can keep stable structure and performance in a higher-temperature environment, is wider in application scene, has uniform and regular internal cell structure, small size deviation and strong overall structural stability.

Inventors

  • ZHONG RONGDONG
  • LIU YUE
  • LI TONGBING

Assignees

  • 广东安拓普聚合物科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (10)

  1. 1. The polyphenyl ether foaming material is characterized by comprising the following components in parts by mass: 60-80 parts of polyphenyl ether; 10-20 parts of high-density polyethylene; 5-15 parts of syndiotactic polystyrene; 2-5 parts of nano boron nitride; 1-5 parts of a compatilizer; 1-3 parts of hyperbranched polyester; And 0.5-2 parts of organic peroxide crosslinking agent.
  2. 2. The polyphenylene ether foam according to claim 1, wherein the compatibilizing agent is selected from any one or more of styrene-maleic anhydride copolymer, ethylene-vinyl acetate copolymer, polypropylene grafted maleic anhydride.
  3. 3. The polyphenyl ether foaming material according to claim 1, further comprising 0.1-0.5 part of an auxiliary agent, wherein the auxiliary agent is an antioxidant or a lubricant; The antioxidant is selected from one or more of hindered phenol antioxidants and phosphite antioxidants; the lubricant is one or more selected from stearic acid, zinc stearate and ethylene bis stearamide.
  4. 4. The polyphenylene ether foam material according to claim 1, wherein the hyperbranched polyester is a hydroxyl-terminated hyperbranched polyester; the number average molecular weight of the hydroxyl-terminated hyperbranched polyester is 1000-5000 g/mol, and the hydroxyl functionality is 8-30.
  5. 5. The polyphenylene ether foam according to claim 1, wherein the mass ratio of the syndiotactic polystyrene to the nano boron nitride is (2-5): 1.
  6. 6. The polyphenylene ether foam according to claim 1, wherein the organic peroxide crosslinking agent is selected from any one or more of dicumyl peroxide, benzoyl peroxide, and di-t-butyl peroxide.
  7. 7. The process for preparing the polyphenyl ether foam material as set forth in any one of claims 1 to 6, which is characterized by comprising the following steps: S1, uniformly mixing the components according to the corresponding parts by mass to obtain a composite substrate; S2, adding the composite substrate in the S1 into a double-screw extruder, and carrying out melt blending and plasticization to obtain a molten substrate; s3, introducing supercritical carbon dioxide into the tail end of the double screw, controlling the temperature to be 240-290 ℃, the pressure to be 10-13 MPa and the time to be 4-8 min, mixing uniformly, and then sending the mixture into a single screw extruder to cool to 200-220 ℃; And S4, delivering the cooled material to a static mixer for further cooling, delivering the cooled material to a foaming die head, then heating to 240-290 ℃ at a rate of 3-8 ℃ per minute in a gradient manner, reducing the pressure to 8-10 MPa for 2-4 min, and then cooling at a rate of 2-5 ℃ per minute in a gradient manner to obtain the polyphenyl ether foaming material.
  8. 8. The preparation process according to claim 7, wherein in the step S2, the screw speed of the twin-screw extruder is 80-120 rpm, the temperature of the feeding section of the twin-screw extruder is 150-160 ℃, the temperature of the mixing section is 240-290 ℃, and the temperature of the discharging section is 230-280 ℃.
  9. 9. The process according to claim 7, wherein the injection rate of supercritical carbon dioxide in step S3 is 0.5-2 l/min.
  10. 10. The application of the polyphenyl ether foam material disclosed in any one of claims 1 to 6 in 5G communication equipment.

Description

Polyphenyl ether foaming material, preparation process and application Technical Field The invention relates to the technical field of polymer foaming materials, in particular to a polyphenyl ether foaming material, a preparation process and application. Background With the rapid popularization and large-scale application of the 5G communication technology, 5G communication equipment (including 5G antenna housing, base station housing, internal protection piece, signal transmission device packaging piece and the like) has strict requirements on the performance of matched protection foaming materials, namely, on one hand, excellent physical protection performance is required, dust and impurities can be effectively prevented from invading the equipment, damage to electronic components is avoided, meanwhile, good mechanical strength is required to resist external slight impact, on the other hand, the 5G signal belongs to a high-frequency signal, the dielectric performance requirement on the material is extremely high, the characteristics of small dielectric constant and low dielectric loss are required to be met, smooth wave transmission of the signal is ensured, obvious attenuation is not generated, stable 5G communication quality is ensured, the material is required to adapt to outdoor complex use environment, excellent high temperature resistance is maintained, structural stability and performance are not changed under the medium-high temperature condition, meanwhile, the uniformity of a cell structure is critical to the performance, the cell size deviation is small, the structural uniformity is an important precondition of ensuring the stable dielectric performance and avoiding the local attenuation of the signal. In addition, the requirement of large-scale production of 5G communication equipment also puts forward the high-efficient, continuous and stable requirement to the preparation technology of the foaming material, and mass production needs to be realized and the uniformity of the performance of the product is ensured. Polyphenylene Oxide (PPO) has the excellent characteristics of low dielectric property, high temperature resistance and self flame retardance due to regular molecular structure and few polar groups, and becomes an ideal substrate for preparing the 5G communication equipment wave-transparent protective foaming material. However, the prior art optimizes the modified foaming of PPO, and has obvious short plates on the improvement of material performance. If the SEBS and other toughening agents are added for modification, the heat resistance of the SEBS is far lower than that of PPO, the glass transition temperature of the composite material can be obviously reduced after the SEBS is added, the high temperature resistant advantage of the PPO is sacrificed, the structural stability and the size retention of the material in a medium-high temperature use environment are greatly reduced, and the material cannot adapt to the outdoor use requirement of 5G equipment. Meanwhile, the prior art does not adopt targeted cell refinement and homogenization measures from the aspects of a formula and a process, the prepared foam material has wide cell diameter distribution range and large size deviation, and is easy to generate structural defects such as cell breakage, aggregation and the like, even if the material has good basic dielectric property, the 5G high-frequency signal is locally attenuated in the propagation process due to uneven cell structure, the stable wave transmission effect cannot be ensured, and the high-precision requirement of 5G communication on signal transmission is difficult to meet. The modified foaming scheme in the prior art cannot improve the wave-transmitting effect and optimize the cell structure, and meanwhile, the high temperature resistance of the material is reserved, so that the prepared foaming material is difficult to match with the core requirement of 5G communication equipment on the protection foaming material. Disclosure of Invention Aiming at the defects of poor component compatibility, uneven cell structure, difficulty in considering wave transmission and high temperature resistance, unstable preparation process, large industrialization difficulty and the like of the polyphenyl ether foaming material in the prior art, the invention provides a polyphenyl ether foaming material, a preparation process and application. The material formula of the invention combines the low dielectric property, high heat resistance and structural stability of the material by the synergistic effect of the components, adopts the continuous flow of melt blending of a double-screw extruder, cooling treatment of a single-screw extruder, homogenization of a static mixer and gradient temperature control and pressure control foaming of supercritical CO 2 in the preparation process, precisely controls the technological parameters of each step, realizes the stable and controllable foaming pro