A kind of microencapsulated expandable graphite and its preparation method and its application in the preparation of composite polyurethane rigid foam
A technology of composite polyurethane and expanded graphite, which is applied in the field of flame retardants and expandable graphite flame retardants to achieve the effects of less addition, high mechanical properties and flame retardant properties, and high flame retardant efficiency
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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
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