Flame-retardant polyurethane foam with electromagnetic shielding function and preparation method of flame-retardant polyurethane foam

Abstract

The invention discloses flame-retardant polyurethane foam with an electromagnetic shielding function and a preparation method of the flame-retardant polyurethane foam.The preparation method comprisesthe following steps that 1, placing polyurethane foam in a mixed solution A to be soaked, wherein the mixed solution A is obtained by mixing a phosphoric acid-containing solution and an aniline solution, and the substance amount ratio of phosphoric acid to aniline in the mixed solution A is 1: 10-1.5: 1; 2, adding ammonium persulfate into the mixed solution A in the step 1 for in-situ polymerization, and fully reacting to obtain polyurethane foam coated with phosphoric acid doped polyaniline, wherein the mass ratio of the ammonium persulfate to the aniline is 1: 1-1.5: 1; and 3, dip-coating the polyurethane foam coated with the phosphoric acid doped polyaniline in a conductive solution for N times, and drying to obtain the required flame-retardant polyurethane foam with the electromagneticshielding function. The obtained polyurethane foam is good in electromagnetic shielding effect and good in flame retardant property and can pass a vertical combustion test, and the oxygen index can reach 34.2%; and 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...

Examples

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.

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...

Examples

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.

Images