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High-char-forming expandable graphite and application thereof in rigid polyurethane foam

A technology of expanded graphite and rigid foam, which is applied in the field of foam materials, can solve the problems of poor mechanical properties of polyurethane foam, and achieve the effects of improved compatibility, long-lasting flame retardant efficiency, and good compatibility

Active Publication Date: 2016-06-15
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to improve the problem of poor mechanical properties of expandable graphite flame-retardant polyurethane foam, and further improve the char formation and flame retardancy of polyurethane foam; Applications in Rigid Foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Put expandable graphite (EG) at 60 o C dry for 4 hours, add coupling agent KH-550 and absolute ethanol accounting for 2% of the mass of expandable graphite in a container equipped with stirring to form a 90% coupling agent solution, and then add dry expandable graphite to the coupling agent solution and stirred for 15 minutes and then dried to obtain the expandable graphite modified by the coupling agent;

[0038] Disperse the above-mentioned modified expandable graphite in dioxane, add phosphorus oxychloride accounting for 30% of the expandable graphite mass, and keep the temperature at 60 o C stirs 2h, then adds the thermosetting phenolic resin prepolymer of expandable graphite quality 40%, is heated up to 60 o C reacted for 5h, then lowered to room temperature, filtered, washed with water and dried to obtain high carbon-forming expandable graphite.

[0039] 2. In parts by weight, add 5 parts of high-carbon-forming expandable graphite, 3 parts of purified water, ...

Embodiment 2

[0041] 1. Put the expandable graphite EG at 70 o C dry for 5 hours, add coupling agent KH-560 and absolute ethanol accounting for 3% of the mass of expandable graphite in a container equipped with stirring to form a 90% coupling agent solution, and then add dry expandable graphite to the coupling agent solution and stirred for 20 minutes and then dried to obtain the expandable graphite modified by the coupling agent;

[0042] Disperse the above-mentioned modified expandable graphite in dioxane, add phosphorus oxychloride with 40% of the mass of expandable graphite, and keep the temperature at 60 o C stirs 3h, then adds the thermosetting phenolic resin prepolymer of expandable graphite mass 50%, is warming up to 70 oC reacted for 8h, then cooled to room temperature, filtered, washed with water and dried to obtain high-char-forming expandable graphite.

[0043] 2. In parts by weight, add 10 parts of high carbon-forming expandable graphite, 3 parts of purified water, 3 parts of...

Embodiment 3

[0045] 1. Put the expandable graphite EG at 70 o C After drying for 5 hours, add coupling agent NDZ-201 and absolute ethanol accounting for 4% of the mass of expandable graphite in a container equipped with stirring to form a 90% coupling agent solution, and then add dry expandable graphite to the coupling agent solution and stirred for 30min, then take out and dry to obtain the expandable graphite modified by coupling agent;

[0046] Disperse the above-mentioned modified expandable graphite in dioxane, add phosphorus oxychloride with 50% of the mass of expandable graphite, and keep the temperature at 60 o C stirs 4h, then adds the thermosetting phenolic resin prepolymer of expandable graphite quality 60%, is warming up to 80 o C reacted for 10h, then lowered to room temperature, filtered, washed with water and dried to obtain high carbon-forming expandable graphite.

[0047] 2. In parts by weight, add 15 parts of high carbon-forming expandable graphite, 5 parts of purified ...

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PUM

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Abstract

The invention discloses high-char-forming expandable graphite and an application thereof in rigid polyurethane foam. The high-char-forming expandable graphite is prepared by: 1) chemically modifying high-char-forming resin or cellulose and grafting the high-char-forming resin or cellulose to surface of the expandable graphite, and modifying the expandable graphite through coupling agent modification and graft modification; 2) adding 5-20 parts of high-char-forming expandable graphite to a mixture composed of 80-100 parts of polyether glycol, 3-8 parts of a foamer, 2-4 parts of a foam stabilizer and 3-6 parts of a foaming catalyst; 3) adding 120-150 parts of a polyisocyanate compound; and 4) mixing the components, pouring the mixture, and foaming the mixture to prepare the rigid polyurethane foam. The high-char-forming expandable graphite is significantly improved in compatibility between the expandable graphite and the polyurethane foam substrate, improves mechanical performance of plastic, increases the oxygen index of the foam plastic, reduces heat release rate, significantly delays ignition time, greatly increases combustion char-forming quantity, and has excellent flame-retarding performance.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a high-char-forming expandable graphite and its application in polyurethane rigid foam. Background technique [0002] Expandable graphite (EG) is a new type of low-smoke, halogen-free flame retardant. Its expansion characteristics are different from other expansion agents. It begins to expand through the decomposition of interlayer compounds at around 200 ° C, and reaches the maximum at around 900 ° C. Its expansion ratio can reach 280 times. The expanded graphite changes from the original scale shape to a "worm" shape with a very low density, forming an efficient heat insulation and oxygen barrier layer. The expanded graphite is the carbon source in the expansion system. The heat release rate is very low, the mass loss is very small, and the smoke generated is very little, so it can effectively play the role of flame retardancy and smoke suppression. Th...

Claims

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Application Information

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IPC IPC(8): C08K9/08C08K9/04C08K9/06C08K7/24C08K3/04C08G18/48C08J9/08C08J9/14C08G101/00
Inventor 杨桂生袁海霞
Owner HEFEI GENIUS NEW MATERIALS