Novel fire retardant microencapsulated red phosphorus and preparation method thereof

[0019] Such as figure 1 As shown, weigh phenol, formaldehyde, and methanol with a mass ratio of 20:20:1, mix and add an appropriate amount of deionized water, control the reaction temperature at about 70 ℃, and add dropwise a NaOH solution with a molar concentration of 0.1 mol / L to adjust the pH , Keep the solution in a weakly alkaline environment with pH=8. After 25 minutes of reaction, a transparent solution is obtained, which is a phenol-formaldehyde prepolymer.

[0020] Weigh 10.0 g of ultra-fine red phosphorus (400 mesh), dissolve it in a proper amount of water, sonicate for 15 min, add 0.2 g of sodium lauryl sulfonate, stir well at 65 ℃, and then add 0.2 g of sodium persulfate, Then add 1.0 g of phenol-formaldehyde prepolymer and react for 0.5 h. In this process, adjust the pH to 2 with 0.1 mol / L HCL and 0.1 mol / L NaOH aqueous solution. After the reaction is completed, the solution is cooled, filtered, washed, and dried to obtain red phosphorus microcapsules coated with p...

[0022] Weigh phenol, formaldehyde, and methanol with a mass ratio of 20:28:1, mix and add an appropriate amount of deionized water, control the reaction temperature at about 75 ℃, and add dropwise NaOH solution with a molar concentration of 0.1 mol / L to adjust the pH to make the solution Always maintain a weak alkaline environment with pH = 8, and after 25 minutes of reaction, a transparent solution is obtained, which is a phenol-formaldehyde prepolymer.

[0023] Weigh 10.0 g of ultra-fine red phosphorus (400 mesh), dissolve it in an appropriate amount of water, ultrasonically treat it for 15 minutes, add 0.2 g of sodium hexametaphosphate, stir well at 65 ℃, then add 0.2 g of ammonium persulfate, and then add 1.5 g phenol-formaldehyde prepolymer, react for 1 h. During this process, adjust the pH to 6 with 0.1 mol / L NaOH and 0.1 mol / L NaOH aqueous solution. After the reaction is completed, the solution is cooled, filtered, washed, and dried to obtain red phosphorus microcapsules ...

[0025] Weigh phenol, formaldehyde, and methanol with a mass ratio of 20:20:1, mix and add an appropriate amount of deionized water, control the reaction temperature at about 80 ℃, and add dropwise NaOH solution with a molar concentration of 0.1 mol / L to adjust the pH to make the solution Always maintain a weak alkaline environment with pH = 8.5. After 35 minutes of reaction, a transparent solution is obtained, which is a phenol-formaldehyde prepolymer.

[0026] Weigh 10.0 g of ultra-fine red phosphorus (800 mesh), dissolve it in a suitable amount of water, ultrasonically treat it for 20 min, add 0.1 g of polyethylene glycol 200, stir well at 65 ℃, then add 0.3 g of ammonium persulfate, and then add 1.0 g of phenol-formaldehyde prepolymer was reacted for 1.5 h. During this process, adjust the pH to 4 with 0.1 mol / L HCL and 0.1 mol / L NaOH aqueous solution. After the reaction is completed, the solution is cooled, filtered, washed, and dried to obtain red phosphorus microcapsules co...