An integrated broadband high wave-transparent tough polyolefin microcellular foam material and its preparation method

A technology of microcellular foam and polyolefin, applied in the field of communication equipment materials, can solve the problems of limited application, relatively high brittleness, poor tear resistance, etc., and achieve the effect of improving mechanical properties, increasing melt strength, and uniform cells

Active Publication Date: 2021-06-01
JIANGSU JICUI ADVANCED POLYMER MATERIAL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its microporous foam material is relatively brittle and has poor tear resistance, which limits its application in the field of wave-transmitting materials to a certain extent.

Method used

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  • An integrated broadband high wave-transparent tough polyolefin microcellular foam material and its preparation method
  • An integrated broadband high wave-transparent tough polyolefin microcellular foam material and its preparation method
  • An integrated broadband high wave-transparent tough polyolefin microcellular foam material and its preparation method

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preparation example Construction

[0035] The preparation process of the above-mentioned wave-transparent material can be divided into two steps: the preparation of raw materials and the foaming process.

[0036] For the preparation process of raw materials, fully mix polyolefin pellets (melt index ≤ 5g / 10min), β-cyclodextrin urethanization modifier, flame retardant, anti-aging agent and use three-layer co-extrusion screw The extruder thickness is 10-15mm thick polyolefin sheet, the thickness of the upper and lower layers is 0.5mm-2mm thick, the content of β-cyclodextrin urethanization modifier is 1%-5%, and the middle layer is 6- The thickness is 14mm, and the content of β-cyclodextrin urethane modification agent is 3%-10%. The upper and lower cortex are more modified, which promotes CO 2 The solubility improves the nucleation efficiency and effectively reduces the cell size; at low expansion ratios, the hardness increases, and the toughening modification can also effectively improve the toughness of the hard...

Embodiment 1

[0048] The preparation process of the β-cyclodextrin urethane modification agent is as follows: In a dry three-necked flask, the toluene diisocyanate solution is dropped into the pyridine solution of the dehydrated β-cyclodextrin, wherein n(-NCO) / n(-CH 2 OH) between 1.8-2.0. Then add a small amount of catalyst (organotin such as dibutyltin dilaurate), and stir evenly. The exothermic heat of the reaction automatically rises to 80°C, and the reaction is performed at a constant temperature for about 2 hours to obtain a prepolymer. Cool down to about 60°C, add the chain extender ethylene glycol dropwise (the amount of the substance is 0.43 times the amount of the NCO group substance remaining in the prepolymer), mix quickly and evenly, and when the temperature rises to about 80°C, stop stirring and start Vacuum devolatilization. React for about 0.5-1h and cool down, add a polymerization inhibitor (organic amines such as dibutylamine) at 40°C, stir quickly and pour into a low-t...

Embodiment 2

[0052] Mix polypropylene pellets (melt index 2g / 10min), β-cyclodextrin urethanation modifier, flame retardant, anti-aging agent according to 91:7:1:1 and 97:1:1:1 Blending, and then adding to the twin-screw multi-layer sheet extruder of the outer layer and the inner layer respectively, the processing temperature is 210-290°C, and the temperature of the sheet extrusion die is between 180-240°C. A polyolefin sheet having a thickness of 10 mm was obtained by passing through a three-roll cooling rack.

[0053] Put the obtained polypropylene sheet into the cavity of a multi-layer molded foaming machine (with a smooth release film on the upper and lower sides), fill it with supercritical fluid, the pressure is 10MPa, the temperature is 163°C, and after heat preservation and pressure holding for 30min, Quickly open the mold to release the pressure, and you can get a high-toughness one-piece polyolefin microporous high-wave-transparency material.

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Abstract

The invention relates to an integrated broadband high wave-transmitting tough polyolefin microporous foam material and a preparation method thereof, belonging to the technical field of communication equipment materials. Aiming at the wave-transmitting performance required by communication equipment in the 600MHz-300GHz broadband electromagnetic wave frequency band, the present invention uses a self-synthesized β-cyclodextrin urethane-based modifier to carry out blending modification on the polyolefin foaming raw material, and Through multi-layer co-extrusion and green and environmentally friendly integral molding solid-state molding foaming technology, an integrated broadband, high-transmission, strong and tough polyolefin material is manufactured. The wave-transparent material in the present invention, its main raw material is polyolefin material, and the structure of material mainly is middle layer and the skin layer that is positioned at both sides, and middle layer and skin layer are the foaming structure of cell wall thickness<100nm, but two The expansion ratio of the two is different. Such a structure can not only effectively improve the permeability of millimeter waves, but also greatly improve production efficiency, shorten the process flow, and reduce production costs.

Description

technical field [0001] The invention relates to an integrated broadband high wave-transmitting tough polyolefin microporous foam material and a preparation method thereof, belonging to the technical field of communication equipment materials. Background technique [0002] High-frequency 5G communication is millimeter wave, and the disadvantage is that it tends to propagate in a straight line and has significant attenuation. The frequency bands mainly used in the current 5G communication market are divided into two parts, 5G-sub6 frequency band (617MHz-5GHz) and 5G-mmW frequency band (26.5GHz-40GHz), which not only requires wave-transparent materials to have high wave-transmission rate in a specific stage, It also puts forward certain requirements and demands for its wave-transmitting performance in broadband and high-frequency bands. [0003] However, at present, the wave-transmitting material structure of the millimeter wave radome is mostly a sandwich structure composite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L75/04C08K3/22C08J5/18C08J9/12C08G18/76C08G18/65C08G18/64C08G18/32C08G18/10B29C33/68B29C44/12B29C44/58B29C48/21B29C48/40
CPCC08G18/7614C08G18/6484C08G18/10B32B5/20B32B5/32B32B2266/025B32B2307/558B29C48/18B29C48/07B29C48/0012C08L23/12B32B2266/10B32B2307/20C08G18/3206C08L75/04Y02P20/54
Inventor 龚鹏剑李光宪王素真洪江蒋根杰
Owner JIANGSU JICUI ADVANCED POLYMER MATERIAL RES INST CO LTD
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