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CN-122011484-A - Polyphenyl ether foaming bead molding body and preparation method and application thereof

CN122011484ACN 122011484 ACN122011484 ACN 122011484ACN-122011484-A

Abstract

The invention belongs to the technical field of high polymer materials, and discloses a polyphenyl ether foaming bead forming body, and a preparation method and application thereof. The preparation method of the polyphenyl ether foaming bead molding comprises the following steps of S1, carrying out melt blending and granulation on preparation raw materials through a double screw extruder to obtain polyphenyl ether compound particles, S2, carrying out hot-pressing sintering on the polyphenyl ether compound particles to obtain a polyphenyl ether compound porous sintered body, and S3, carrying out supercritical fluid saturation treatment on the polyphenyl ether compound porous sintered body, and then carrying out pressure relief foaming to obtain the polyphenyl ether foaming bead molding. The invention realizes systematic regulation and control of microstructure and macroscopic property of the foam molding body through a scientific synergistic process of a compound material system, hot-press sintering and supercritical foaming, and successfully prepares the polyphenyl ether foam bead continuous molding body with uniform foam cells, light weight, high strength, excellent toughness, reliable mechanical property and flame retardant property.

Inventors

  • ZHAI WENTAO
  • Tian Fangwei
  • JIANG JUNJIE

Assignees

  • 中山大学南昌研究院

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. A method for preparing a polyphenyl ether foaming bead molding body is characterized by comprising the following steps: s1, carrying out melt blending and pelleting on preparation raw materials by a double screw extruder to obtain polyphenyl ether compound particles, wherein the preparation raw materials comprise, by weight, 60-90 parts of polyphenyl ether powder, 5-25 parts of high impact polystyrene, 0.5-5 parts of SEBS elastic resin, 3-15 parts of halogen-free flame retardant and 0.1-1 part of antioxidant, and the halogen-free flame retardant is a polysiloxane compound; S2, carrying out hot-pressing sintering on the polyphenyl ether compound particles to obtain a polyphenyl ether compound porous sintered body, wherein the hot-pressing sintering temperature is 180-230 ℃ and the pressure is 5-20 MPa; And S3, performing supercritical fluid saturation treatment on the porous sintered body of the polyphenyl ether compound, and then performing decompression foaming to obtain the polyphenyl ether foaming bead molding body.
  2. 2. The method for preparing the polyphenyl ether foaming bead molded body according to claim 1, wherein the preparation raw materials comprise, by weight, 70-80 parts of polyphenyl ether powder, 15-20 parts of high impact polystyrene, 3-5 parts of SEBS elastic resin, 10-15 parts of halogen-free flame retardant and 0.5-0.8 part of antioxidant.
  3. 3. The method for producing a molded article of polyphenylene ether expanded beads according to claim 1, wherein the polysiloxane-based compound comprises an aminopolysiloxane and/or a phenylpolysiloxane, and/or the antioxidant comprises pentaerythritol tetrakis [ beta- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] and tris (2, 4-di-t-butylphenyl) phosphite.
  4. 4. The method for producing a molded article of polyphenylene ether expanded beads according to claim 1, wherein in step S1, the twin-screw extruder has a temperature of 190℃to 240℃and a rotational speed of 200rpm to 500rpm, and/or wherein in step S1, the granulating means is strand-cutting or underwater-cutting, and/or wherein in step S1, the polyphenylene ether composite fine particles have a particle diameter of 0.3mm to 1mm.
  5. 5. The method for producing a molded article of polyphenylene ether expanded beads according to claim 1, wherein in step S2, the porous sintered body of polyphenylene ether composite has a porosity of 8 to 18% and an average pore diameter of 80 μm to 150 μm, and/or wherein in step S2, the porous sintered body of polyphenylene ether composite has a thickness of 1mm to 2mm.
  6. 6. The method for producing a molded article of polyphenylene ether expanded beads according to claim 5, wherein in step S2, the porous sintered body of polyphenylene ether composite has a porosity of 10% to 15% and an average pore diameter of 90 μm to 120. Mu.m, and/or wherein in step S2, the porous sintered body of polyphenylene ether composite has a thickness of 1.5mm to 1.8mm.
  7. 7. The method for producing a molded article of polyphenylene ether expanded beads according to claim 1, wherein in step S2, the hot press sintering is carried out at a temperature of 200 to 220℃and a pressure of 10 to 15MPa.
  8. 8. The method for producing a molded article of polyphenylene ether expanded beads according to claim 1, wherein in step S3, the supercritical fluid used for the supercritical fluid saturation treatment is carbon dioxide or nitrogen, and/or, in step S3, the supercritical fluid saturation treatment is carried out at a saturation temperature of 80℃to 170℃and a saturation pressure of 10MPa to 30MPa for a saturation time of 10min to 50min, and/or, in step S3, the rate of the pressure-release expansion is 0.2MPa/S to 1MPa/S.
  9. 9. A polyphenylene ether expanded bead molded article produced by the production method according to any one of claims 1 to 8.
  10. 10. The use of the polyphenylene ether expanded bead molded body according to claim 9 as a heat insulating material or an electromagnetic shielding material.

Description

Polyphenyl ether foaming bead molding body and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a polyphenyl ether foaming bead forming body, a preparation method and application thereof. Background Polyphenylene Oxide (PPO) as a high-performance polymer has an important application potential in high-end manufacturing fields such as electronics, electrics, automobiles, aerospace and the like by virtue of excellent thermal stability, high glass transition temperature (usually more than 210 ℃) and intrinsic flame retardance. However, the characteristics of high rigidity and high melt viscosity of the molecular chains of the PPO lead to narrow melt processing window, and the pure PPO is difficult to realize efficient molding through conventional extrusion, injection molding and other processes, so that the preparation of products with complex structures faces significant challenges. In order to improve the processing performance, a strategy of blending with styrene resin is commonly adopted in industry, and the introduction of the resin can effectively reduce the melt viscosity and the processing temperature of a blending system and improve the fluidity, but simultaneously, the glass transition temperature and the thermal deformation temperature of the material are obviously reduced, the heat resistance is greatly reduced, and the resin is difficult to be applied to a scene with strict requirements on high-temperature dimensional stability. In recent years, in order to expand the application of PPO in the fields of light weight, heat insulation, buffering and complex structural parts, attention is paid to a polyphenyl ether-based foaming bead prepared by a physical foaming process and a steam forming technology thereof, the technology heats the bead in a mold by taking steam as a heating medium, the surface of the bead is softened and expanded by utilizing steam heat and pressure, molecular chains are mutually diffused and cooled for shaping, and finally, a light high-strength formed product with a three-dimensional net structure is formed. However, the successful implementation of this process is highly dependent on the softening and fusing ability of the expanded beads under limited steam conditions. Currently, the steam pressure of the conventional commercial steam molding equipment is usually not more than 0.4MPa, the corresponding saturated steam temperature is limited, and if the heat-resistant temperature of the expanded beads is too high, sufficient surface softening and interfacial molecular chain entanglement are difficult to achieve under the conventional process conditions, so that the bonding strength among the beads is insufficient or the molding fails. To accommodate the equipment process window, it is common to employ a method of greatly increasing the HIPS or PS content to reduce the softening temperature of the expanded beads, ensuring effective bonding during steam forming. However, this formulation adjustment to meet process flexibility further sacrifices the inherent advantages of PPO as a high performance substrate, resulting in the final molded article facing problems of poor structural uniformity, significantly reduced heat resistance, poor high temperature dimensional stability, and severe deterioration of foam toughness, kink resistance, and long term creep resistance. Therefore, under the condition of the prior art, how to realize the efficient and reliable molding of the foaming beads in the conventional steam molding equipment on the premise of not damaging the inherent heat resistance and mechanical property of the PPO base material, so as to prepare the foam molding body with high heat resistance, high flame retardance and excellent mechanical property, and the foaming molding body has become a core technical problem for promoting the application of the high-performance material in the high-end field to be solved urgently. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a polyphenyl ether foaming bead forming body, and a preparation method and application thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: in a first aspect, the present invention provides a method for producing a molded article of polyphenylene ether expanded beads, comprising the steps of: s1, carrying out melt blending and pelleting on preparation raw materials by a double screw extruder to obtain polyphenyl ether compound particles, wherein the preparation raw materials comprise, by weight, 60-90 parts of polyphenyl ether powder, 5-25 parts of high impact polystyrene, 0.5-5 parts of SEBS elastic resin, 3-15 parts of halogen-free flame retardant and 0.1-1 part of antioxidant, and the halogen-free flame retardant is a polysiloxane compound; S2, carrying out hot-pressing sintering on the polyphenyl ether compound