Flame-retardant rigid polyurethane foam of hydrophobic graphene aerogel coating and preparation method of flame-retardant rigid polyurethane foam

A graphene aerogel, rigid polyurethane technology, applied in coatings, fire-resistant coatings, etc., can solve problems such as being unsuitable for large-scale promotion, strict preparation environment requirements, complex preparation processes, etc. The effect of simple process and low equipment requirements

Active Publication Date: 2019-06-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of intrinsically flame-retardant method has defects such as complicated preparation process and strict reaction conditions, and it is difficult to mass-produce it in commerce.
Patent CN108341946A discloses a preparation method of phosphorus-based block flame-retardant polyether, which belongs to the reactive additive, but the preparation environment is strict and the preparation process is complicated, so it is not suitable for large-scale promotion

Method used

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  • Flame-retardant rigid polyurethane foam of hydrophobic graphene aerogel coating and preparation method of flame-retardant rigid polyurethane foam
  • Flame-retardant rigid polyurethane foam of hydrophobic graphene aerogel coating and preparation method of flame-retardant rigid polyurethane foam
  • Flame-retardant rigid polyurethane foam of hydrophobic graphene aerogel coating and preparation method of flame-retardant rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 prepares a kind of method of hydrophobic graphene aerogel coating flame retardant rigid polyurethane foam, comprises the steps:

[0046](1) Weigh 26g ethyl orthosilicate, 28.57g ethanol and 2.25g distilled water and mix evenly (the molar ratio of orthosilicate to ethanol is 1:5, and the molar ratio of ethanol to water is 5:1) to obtain a solution , use 0.1mol / L hydrochloric acid solution to adjust the pH value of the solution to 4.0, stir, the stirring rate is 200rpm, the stirring time is 20min, then seal and stand for 18h to carry out the hydrolysis reaction to obtain the hydrolyzate;

[0047] (2) 25g concentration of reduced graphene oxide solution that is 1mg / mL is added to the 60g hydrolyzate described in step (1) (the mass ratio of reduced graphene oxide solution to hydrolyzate is 1:2.4), ultrasonic dispersion treatment, ultrasonic The ultrasonic frequency of the treatment is 30kHz, and the ultrasonic treatment time is 30min to obtain a mixed solution,...

Embodiment 2

[0056] Embodiment 2 prepares the method for a kind of hydrophobic graphene airgel coating flame-retardant rigid polyurethane foam, comprises the steps:

[0057] (1) Weigh 26g of tetraethyl orthosilicate, 34.29g of ethanol and 2.25g of distilled water and mix evenly (the molar ratio of tetraethyl orthosilicate to ethanol is 1:6, and the molar ratio of ethanol to water is 6:1) to obtain a solution , use 0.1mol / L hydrochloric acid solution to adjust the pH value of the solution to 3.5, stir, the stirring rate is 150rpm, the stirring time is 30min, then seal and stand for 24h to carry out the hydrolysis reaction to obtain the hydrolyzate;

[0058] (2) 17g concentration of reduced graphene oxide solution that is 3mg / mL is added to the 66.3 hydrolyzate described in step (1) (the mass ratio of reduced graphene oxide solution to hydrolyzate is 1:3.9), ultrasonic dispersion treatment, ultrasonic The ultrasonic frequency of treatment is 25kHz, and the time of ultrasonic treatment is 45m...

Embodiment 3

[0067] Embodiment 3 prepares the method for a kind of hydrophobic graphene airgel coating flame-retardant rigid polyurethane foam, comprises the steps:

[0068] (1) Weigh 26g of tetraethyl orthosilicate, 40g of ethanol and 2.25g of distilled water and mix evenly (the molar ratio of tetraethyl orthosilicate to ethanol is 1:7, and the molar ratio of ethanol to water is 7:1) to obtain a solution, Use 0.1mol / L hydrochloric acid solution to adjust the pH value of the solution to 3.0, stir it, the stirring rate is 100rpm, and the stirring time is 40min, then seal it and let it stand for 30h to carry out the hydrolysis reaction to obtain the hydrolyzed solution;

[0069] (2) The reduced graphene oxide solution that is 5mg / mL is added to the 85g hydrolyzate described in step (1) by 10g concentration (the mass ratio of reduced graphene oxide solution and hydrolyzate is 1:8.5), ultrasonic dispersion treatment, ultrasonic The ultrasonic frequency of the treatment is 20kHz, and the ultras...

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Abstract

The invention discloses flame-retardant rigid polyurethane foam of a hydrophobic graphene aerogel coating and a preparation method of the flame-retardant rigid polyurethane foam. The flame-retardant rigid polyurethane foam comprises the following raw materials: polyether polyol, isocyanate, silicone oil, a catalyst A33, tetraethylortho silicate, ethanol, distilled water, poly-dimethyl siloxane, reduced graphene oxide and trimethylchlorosilane. The preparation method of the flame-retardant rigid polyurethane foam of the hydrophobic graphene aerogel coating specifically comprises the following steps: (1) preparing graphene aerogel with tetraethylortho silicate, ethanol, distilled water and reduced graphene oxide according to a certain process; (2) performing ball-milling on graphene aerogel,mixing the ball-milled graphene aerogel with poly-dimethyl siloxane, and stirring the mixture to obtain a coating; (3) coating rigid polyurethane foam with the coating, and drying to obtain the flame-retardant rigid polyurethane foam. The flame-retardant rigid polyurethane foam disclosed by the invention is simple and convenient in preparation process, green and non-toxic and simple in coating method, easy to operate, good in mechanical property and obvious in flame-retardant effect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a flame-retardant rigid polyurethane foam with a hydrophobic graphene aerogel coating and a preparation method thereof. Background technique [0002] Rigid polyurethane foam is a polymer formed by isocyanate and polyol, with low density and low thermal conductivity as low as 0.024W / m·K. It has excellent mechanical properties, thermal insulation properties, chemical resistance properties, and mechanical properties, and is widely used. In construction engineering, packaging materials, furniture cushions, refrigeration equipment, chemical pipelines, etc. However, rigid polyurethane foam is extremely flammable, and will release a large amount of smoke and toxic gases such as HCN and CO during incomplete combustion and pyrolysis. In recent years, there have been many fires of rigid polyurethane foam. It has caused huge casualties and property losses, which sev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C09D183/04C09D5/18C08L75/04
Inventor 江赛华游文杰卞浩然黄裕斌
Owner SOUTH CHINA UNIV OF TECH
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