Novel fire retardant microencapsulated red phosphorus and preparation method thereof
A technology of microencapsulated red phosphorus and flame retardant, which is applied in the field of new flame retardant microencapsulated red phosphorus and its preparation, and can solve the problems of easy agglomeration of particles
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Embodiment 1
[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...
Embodiment 2
[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 ...
Embodiment 3
[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...
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