Preparation method of lightweight high-shielding PA6/PS composite foam

A composite foam and lightweight technology, applied in the field of electromagnetic shielding, can solve the problems of secondary pollution of electromagnetic waves, single structure of shielding materials, no structural design, etc., and achieve the effect required by high shielding effectiveness

Pending Publication Date: 2022-05-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, related technologies have disclosed methods for preparing nylon electromagnetic shielding materials. Patent application number 202010812164.X has prepared nylon resin-based electromagnetic shielding materials with carbon fibers and magnetic materials. The shielding materials in this patent have a single structure and no structural design. The amount of filler added is also very high, and the shielding mechanism is mainly based on reflection, which is likely to cause secondary pollution of electromagnetic waves, and does not meet the requirements of high-absorbing electromagnetic shielding materials required by the current market

Method used

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  • Preparation method of lightweight high-shielding PA6/PS composite foam
  • Preparation method of lightweight high-shielding PA6/PS composite foam
  • Preparation method of lightweight high-shielding PA6/PS composite foam

Examples

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Effect test

Embodiment 1

[0027] A preparation method of light-weight and high-shielding PA6 / PS composite foam

[0028] Add 15g PS to 85g molten caprolactam monomer at 110°C and stir mechanically for 3.5h to obtain CL / PS suspension. Put the suspension in a heating mantle at 160°C for 30 minutes to remove water under vacuum, add 0.4g NaOH, continue to remove water for 30 minutes, add 0.4g TDI, shake vigorously quickly and pour it into a mold at 180°C for polymerization for 40 minutes to obtain PA6 / PS alloy. Use a high-speed pulverizer to pulverize the PA6 / PS alloy to obtain the first mixed powder; add 5g of carbon black (CB) to the first mixed powder and mix at a high speed for 3 minutes to obtain the second mixed powder; put the second mixed powder in In a specific mold, use a fully automatic tablet press to mold the mixed powder. The molding temperature is 200°C, the time is 10min, and the pressure is 10MPa to obtain a PA6 / PS / CB composite material.

Embodiment 2

[0030] Add 15g PS to 85g molten caprolactam monomer at 110°C and stir mechanically for 3.5h to obtain CL / PS suspension. Put the suspension in a heating mantle at 160°C for 30 minutes to remove water under vacuum, add 0.4g NaOH, continue to remove water for 30 minutes, add 0.4g TDI, shake vigorously quickly and pour it into a mold at 180°C for polymerization for 40 minutes to obtain PA6 / PS alloy. Use a high-speed pulverizer to pulverize the PA6 / PS alloy to obtain the first mixed powder; add 5g of CB to the first mixed powder and mix at high speed for 3 minutes to obtain the second mixed powder; put the second mixed powder into a specific mold, Use a fully automatic tablet press to mold the mixed powder. The molding temperature is 200°C, the time is 10min, and the pressure is 10MPa to obtain a PA6 / PS / CB composite material; use a foaming kettle to mold the PA6 / PS / CB composite material Supercritical CO 2 For foaming treatment, the foaming temperature is 80°C, the pressure holding...

Embodiment 3

[0032]Add 15g PS to 85g molten caprolactam monomer at 110°C and stir mechanically for 3.5h to obtain CL / PS suspension. Put the suspension in a heating mantle at 160°C for 30 minutes to remove water under vacuum, add 0.4g NaOH, continue to remove water for 30 minutes, add 0.4g TDI, shake vigorously quickly and pour it into a mold at 180°C for polymerization for 40 minutes to obtain PA6 / PS alloy. Use a high-speed pulverizer to pulverize the PA6 / PS alloy to obtain the first mixed powder; add 5g of MWCNT to the first mixed powder and mix at high speed for 3 minutes to obtain the second mixed powder; put the second mixed powder into a specific mold, The mixed powder was molded with a fully automatic tablet press at a temperature of 200° C. for 10 minutes and a pressure of 10 MPa to obtain a PA6 / PS / MWCNT composite material.

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Abstract

The preparation method comprises the following steps: adding polystyrene into a molten caprolactam monomer to prepare a caprolactam / polystyrene suspension, adding an initiator sodium hydroxide and an activating agent toluene diisocynate, initiating caprolactam anion ring-opening polymerization at 150-200 DEG C for 20-60 minutes, and carrying out a polymerization reaction at 150-200 DEG C for 20-60 minutes to obtain the lightweight high-shielding PA6 / PS composite foam. The PA6 / PS alloy with the phase inversion structure is obtained; crushing the obtained PA6 / PS alloy, adding a conductive filler, mixing, and carrying out hot press molding to obtain a composite material; and carrying out supercritical CO2 foaming treatment on the obtained composite material to obtain the composite material. The method is simple in process and low in cost, conductive filler with more contents and types can be introduced, and the prepared lightweight high-shielding PA6 / PS composite foam has microsphere and foam structures and can well meet the requirements of high absorption and high shielding effectiveness.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a preparation method of light-weight and high-shielding PA6 / PS composite foam. Background technique [0002] As one of the indicators to measure the strength of a country, the power of science and technology has prompted countries all over the world to devote themselves to the research and development of modern high-tech. The improvement of living standards and work efficiency is so fast that people fail to realize the hidden dangers behind it in time: a large number of electronic When the electromagnetic radiation of a specific frequency is generated, it will affect the normal operation of peripheral equipment; long-term exposure of the human body to electromagnetic radiation can induce cardiovascular diseases, diabetes and cancer mutations. To this end, researchers are committed to researching electromagnetic shielding materials to reduce or even e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L25/06C08L77/02C08K3/04
CPCC08J9/122C08J9/0061C08J9/0066C08J9/0071C08J2203/06C08J2203/08C08J2377/02C08J2425/06Y02P20/54
Inventor 吴波震朱凯琦
Owner ZHEJIANG UNIV OF TECH
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