Nucleotide-based flame retardant microsphere and preparation method and application thereof
A nucleotide and nucleotide-based technology, applied in the field of bio-based flame retardants and their preparation, achieves the effects of wide application range, simple preparation operation and good flame retardant effect
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Embodiment 1
[0035] Synthesis of Nucleotide-Based Flame Retardant Microspheres
[0036] Weigh 0.1mol (12.61g) of melamine and add it to a 250ml four-necked flask, add 150ml of deionized water, adjust the pH of the solution to 11 with sodium hydroxide, heat to 30°C, add 0.3mol (24.34g) of 37% formaldehyde solution ), stirred and reacted for 8h to obtain a clear and transparent prepolymer liquid.
[0037] Weigh 0.05mol (18.16g) of guanylic acid, add it into a 500ml four-necked bottle with a mechanical stirrer, a condenser tube, and a constant pressure dropping funnel, add 100ml of deionized water, and a dispersant polymer with 0.5% guanylic acid quality. Vinyl alcohol (0.09g), heated up to 30°C, stirred for 3h to obtain a homogeneous solution. Then, the previously obtained pre-polymerization solution was added dropwise to the solution, and the drop was completed after 4 hours, and then the pH of the solution was adjusted to 6 with hydrochloric acid, stirred and reacted at 30°C for 6 hours, ...
Embodiment 2
[0039] Synthesis of Nucleotide-Based Flame Retardant Microspheres
[0040] Weigh 0.08mol (10.09g) of melamine into a 250ml four-neck flask, add 120ml of deionized water, adjust the pH of the solution to 10 with sodium hydroxide, heat to 50°C, add 0.24mol (19.47g) of formaldehyde solution, and stir After 4 hours of reaction, a clear and transparent prepolymer solution was obtained.
[0041] Weigh guanylic acid 0.08mol (29.06g), join with mechanical stirring, condenser tube, in the 500ml four-necked bottle of constant pressure dropping funnel, add deionized water 120ml, the dispersant polymer of 0.3% guanylic acid mass Vinyl alcohol (0.09g), heated to 50°C, stirred for 1.5h to obtain a uniform solution. Then, the previously obtained prepolymerization solution was added dropwise to the solution for 2.5 hours, and then the pH of the solution was adjusted to 5 with hydrochloric acid, stirred and reacted for 6 hours at 50°C, separated, washed and dried to obtain flame-retardant mic...
Embodiment 3
[0043] Synthesis of Nucleotide-Based Flame Retardant Microspheres
[0044] Weigh 0.1mol (12.61g) of melamine into a 250ml four-neck flask, add 150ml of deionized water, adjust the pH of the solution to 13 with triethylamine, heat to 60°C, add 0.5mol of glyoxal solution, and stir for 4 hours , to obtain a clear and transparent pre-polymerization solution.
[0045] Weigh 0.2mol (72.64g) of guanylic acid, add it to a 500ml four-necked bottle with mechanical stirring, condenser, and constant pressure dropping funnel, add 200ml of deionized water, and 0.1% guanylic acid mass as a dispersant polyethylene Alcohol (0.07g), heated up to 60°C, stirred for 1h to obtain a homogeneous solution. Then, the previously obtained prepolymerization solution was added dropwise to the solution for 1 hour, and then the pH of the solution was adjusted to 4 with acetic acid, stirred and reacted for 5 hours at 60°C, separated, washed, and dried to obtain flame-retardant microspheres. Immerse the flam...
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