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Microencapsulated expandable graphite, preparation method thereof, and application of microencapsulated expandable graphite in preparing composite rigid polyurethane foam

A composite polyurethane and expanded graphite technology, applied in chemical instruments and methods, dyed low-molecular-weight organic compound treatment, dyed high-molecular-weight organic compound treatment, etc., to achieve high flame retardant efficiency, high mechanical properties and flame retardant properties, and low addition amount Effect

Active Publication Date: 2017-07-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And so far, the use of flame-retardant organic resin double-layer coated expandable graphite and applied to the research report of polyurethane rigid foam has not found

Method used

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  • Microencapsulated expandable graphite, preparation method thereof, and application of microencapsulated expandable graphite in preparing composite rigid polyurethane foam
  • Microencapsulated expandable graphite, preparation method thereof, and application of microencapsulated expandable graphite in preparing composite rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of microencapsulated expandable graphite:

[0040] (1) Preparation of melamine resin prepolymer: Mix and stir melamine and formaldehyde solution at a certain mass ratio, then add triethanolamine aqueous solution to adjust the pH to 7.0, slowly heat up to 60°C and react for 2 hours to obtain viscous transparent water-soluble melamine Resin prepolymer; wherein the mass fraction of formaldehyde solution is 37%, the mass fraction of triethanolamine aqueous solution is 10%, and the mass ratio of melamine and formaldehyde solution is 1:2;

[0041] (2) Expandable graphite coated with melamine resin prepolymer: add expandable graphite to absolute ethanol, stir ultrasonically for 0.5h, add cationic surfactant cetyltrimethylammonium chloride, stir for 1h, and finally Slowly add melamine resin prepolymer, adjust the pH to 3.5 with dilute hydrochloric acid, slowly raise the temperature to 65°C, filter after 2 hours of reaction, and vacuum dry to obtain expandable graphi...

Embodiment 2

[0057] Preparation of microencapsulated expandable graphite:

[0058] (1) Preparation of melamine resin prepolymer: Mix and stir melamine and formaldehyde solution at a certain mass ratio, then add triethanolamine aqueous solution to adjust the pH to 8.0, slowly heat up to 85°C and react for 5 hours to obtain viscous transparent water-soluble melamine Resin prepolymer; wherein the mass fraction of formaldehyde solution is 37%, the mass fraction of triethanolamine aqueous solution is 10%, and the mass ratio of melamine and formaldehyde solution is 1:5;

[0059] (2) Expandable graphite coated with melamine resin prepolymer: Add expandable graphite to absolute ethanol, stir ultrasonically for 1 hour, add cationic surfactant cetyltrimethylammonium chloride, stir for 2 hours, and finally slowly Add melamine resin prepolymer, adjust the pH to 5.5 with dilute hydrochloric acid, slowly heat up to 85°C, filter after reacting for 5 hours, and vacuum-dry to obtain expandable graphite mic...

Embodiment 3

[0080] Preparation of microencapsulated expandable graphite:

[0081] (1) Preparation of melamine resin prepolymer: Mix and stir melamine and formaldehyde solution at a certain mass ratio, then add triethanolamine aqueous solution to adjust the pH to 7.5, slowly heat up to 80°C for 4 hours, and obtain viscous transparent water-soluble melamine Resin prepolymer; wherein the mass fraction of formaldehyde solution is 37%, the mass fraction of triethanolamine aqueous solution is 10%, and the mass ratio of melamine and formaldehyde solution is 1:3;

[0082] (2) Expandable graphite coated with melamine resin prepolymer: Add expandable graphite to absolute ethanol, stir ultrasonically for 40min, add cationic surfactant cetyltrimethylammonium chloride, stir for 1.5h, and finally Slowly add the melamine resin prepolymer, adjust the pH to 4.0 with dilute hydrochloric acid, slowly raise the temperature to 70°C, filter after reacting for 4 hours, and vacuum-dry to obtain expandable graphi...

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Abstract

The invention relates to microencapsulated expandable graphite, which is melamine resin-epoxy resin double-coated expandable graphite, which is characterized by firstly coating a melamine microcapsule outside the expandable graphite, and then coating the microencapsulated expandable graphite with the melamine resin-epoxy resin double-coated expandable graphite of an epoxy resin microcapsule. The microencapsulated expandable graphite can be used as a fire retardant for preparing rigid polyurethane foam, and the prepared rigid polyurethane foam has the density being around 60kg.m<-3>, the heat conductivity coefficient being around 0.03W.(m.k)<-1>, the compression strength being around 0.60MPa, and the limit oxygen index being approximate to 30 percent. The invention discloses a preparation method of the microencapsulated expandable graphite.

Description

technical field [0001] The invention relates to a flame retardant, relates to an expandable graphite flame retardant, in particular to a microencapsulated expandable graphite composite polyurethane rigid foam. Background technique [0002] Polyurethane rigid foam is an excellent thermal insulation material with low density, high specific strength, excellent wear resistance and shock absorption performance and low thermal conductivity, etc. It has been used in various fields of industry and life. The disadvantage of rigid polyurethane foam is that it is flammable and has poor high temperature resistance. When it comes into contact with a fire source, it will immediately produce a flame, causing shocking losses caused by the fire, which has brought a huge threat to human life and property, and has also had a great impact on its application. Big restrictions. As the country has higher and higher requirements for the flame retardancy of public places and building materials, the...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K7/24C09C1/46C09C3/08C09C3/10C08G18/76C08G18/66C08G18/48C08G18/42C08K5/521C08K5/523C08G101/00
CPCC08G18/4018C08G18/6611C08G18/6622C08G18/7664C08K5/521C08K5/523C08K7/24C08K9/10C09C1/46C09C3/006C09C3/08C09C3/10C08L2201/02C08L2201/08C08G2110/0025
Inventor 丁寅徐东洋
Owner NANJING UNIV
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