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A flame-retardant polyurethane foam with electromagnetic shielding function and preparation method thereof

A polyurethane foam and electromagnetic shielding technology, which is applied in the field of polyurethane foam modification, can solve the problems of incompatibility of flame retardancy and electromagnetic shielding performance, destruction of skeleton structure, interruption of conductive network, etc., achieve excellent electromagnetic shielding effect, simple preparation method, Good flame retardant effect

Active Publication Date: 2021-09-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the time, the coating substance will block the polyurethane foam cells, or destroy its skeleton structure, resulting in the interruption of the conductive network, so that it cannot have good flame retardancy and electromagnetic shielding performance

Method used

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  • A flame-retardant polyurethane foam with electromagnetic shielding function and preparation method thereof
  • A flame-retardant polyurethane foam with electromagnetic shielding function and preparation method thereof
  • A flame-retardant polyurethane foam with electromagnetic shielding function and preparation method thereof

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preparation example Construction

[0030] A preparation method of flame-retardant polyurethane foam with electromagnetic shielding function, comprising the following steps:

[0031] Step 1: Immerse the polyurethane foam in the mixed solution A, wherein the mixed solution A is obtained by mixing the phosphoric acid solution and the aniline solution, wherein the ratio of the amount of the phosphoric acid-containing aniline in the mixed solution A is 1:10~1.5: 1;

[0032] Phosphoric acid is one of phosphorous acid, phosphoric acid, and phytic acid, or a mixture of two or more of them in any proportion. The molar concentration of phosphoric acid solution is 0.1M~1.0M, and the molar concentration of aniline solution is 0.5M~5.0M; the immersion time is 1~4h, and the immersion is carried out at 0°C under stirring conditions; generally, the mixed solution A solvent uses water or ethanol.

[0033] Step 2: add ammonium persulfate to the mixed solution A in step 1 to carry out in-situ polymerization, fully react to obta...

Embodiment 1

[0039] Step 1: prepare a phosphoric acid solution with a concentration of 0.1M, add an equal volume of aniline solution with a concentration of 0.5M; soak the polyurethane foam in the above mixed solution, stir at 0°C, and soak for 3 hours.

[0040] Step 2: Add ammonium persulfate in portions, wherein the ratio of ammonium persulfate to aniline is 1.3:1, stirring and impregnating at 0°C for 3 hours; after the reaction is completed, wash the polyurethane foam with water and ethanol, and wash it at 100°C Tumble dry.

[0041] Step 3: Place the polyurethane foam treated in step 2 in an ethanol solution of carbon nanotube CNT with a concentration of 20mg / ml, dip-coat it 7 times, and then dry it at 100°C to obtain a flame-retardant polyurethane with electromagnetic shielding function Foam.

Embodiment 2

[0043] Step 1: Prepare a phosphoric acid solution with a concentration of 0.7M, and add an equal volume of aniline solution with a concentration of 0.7M; soak the polyurethane foam in the above mixed solution, stir at 0°C, and soak for 3 hours.

[0044] Step 2: Add ammonium persulfate in portions, wherein the ratio of the amount of ammonium persulfate to aniline is 1.2:1, stir and impregnate at 0°C for 3 hours; after the reaction is completed, wash the polyurethane foam with water and ethanol, and wash it at 90°C Tumble dry.

[0045] Step 3: Place the polyurethane foam treated in step 2 in an ethanol solution of carbon nanotube CNT with a concentration of 20mg / ml, dip-coat it for 6 times, and then dry it at 90°C to obtain a flame-retardant polyurethane with electromagnetic shielding function Foam.

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Abstract

The invention discloses a flame-retardant polyurethane foam with electromagnetic shielding function and a preparation method thereof, comprising the following steps: Step 1: soaking the polyurethane foam in a mixed solution A, wherein the mixed solution A is a mixture of a phosphoric acid-containing solution and an aniline solution Obtained, wherein the ratio of the amount of phosphoric acid and aniline-containing substances in the mixed solution A is 1:10 to 1.5:1; Step 2: Add ammonium persulfate to the mixed solution A in step 1 to carry out in-situ polymerization, and fully react to obtain Polyurethane foam coated with phosphoric acid-doped polyaniline; wherein the ratio of ammonium persulfate to aniline is 1:1 to 1.5:1; step 3: polyurethane foam coated with phosphoric acid-doped polyaniline Dip coating N times in the conductive solution, and dry to obtain the required flame-retardant polyurethane foam with electromagnetic shielding function; the polyurethane foam obtained by the present invention has good electromagnetic shielding effect, good flame-retardant performance, and can pass the vertical combustion test. It can reach 34.2%; the preparation method is simple and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam modification, in particular to a flame-retardant polyurethane foam with electromagnetic shielding function and a preparation method thereof. Background technique [0002] With the continuous development of science and technology, the wide application of various electronic products such as mobile phones, computers, televisions, etc., while bringing convenience to people, also makes the problem of electromagnetic pollution increasingly serious. This has brought many disasters and accidents to people's lives, and also brought great challenges to the application and design of various electronic systems. At present, some polymer composite materials with electromagnetic shielding effect are very flammable, and their fire safety performance cannot be guaranteed. Therefore, it is of great significance to develop flame-retardant polymers with electromagnetic shielding effect. It can ensure fire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40H05K9/00C08G73/02C08K3/32C08K5/521C08L75/04
CPCC08G73/0266C08J9/40C08J9/405C08J2375/04C08J2479/02C08K3/32C08K5/521C08K2003/329H05K9/0092
Inventor 赵海波张琳郭帅棋徐启帆向培宇曾富容赵炜王玉忠
Owner SICHUAN UNIV
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