A piperazine modified lignin/magnesium aluminum hydroxide double-coated red phosphorus flame retardant and its application in pp
A technology of magnesium aluminum hydroxide and red phosphorus coating, applied in the field of flame retardant additives for polymer materials, can solve the problems of lack of compatibility of synthetic resins, highly toxic phosphine, poor thermal stability, etc., and achieve simple and easy production process Good, low price, stable performance
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Embodiment 1
[0034] Weigh 8 g of sodium hydroxide in a beaker, add deionized water to prepare a sodium hydroxide solution with a concentration of 4 wt%, add 20 g of enzymatic lignin into the sodium hydroxide solution, heat and stir to fully dissolve the lignin in the alkali liquid, and then transferred to a 500 mL three-necked round bottom flask equipped with a condenser and a magnet. When the temperature was stabilized at 90 °C, 24 mL of 37% formaldehyde aqueous solution was added to the solution, and the reaction was stirred at constant temperature for 1 h. 8.6 g of anhydrous piperazine was quickly added to the reaction solution, the temperature was kept at 90 °C, and the magnetic stirring reaction was continued for 2 h to obtain the lignin amine methylated product. Add 160 mg of sodium dodecylbenzenesulfonate and 16 g of red phosphorus to the lignin hydroxymethylation product, continue stirring and dispersing at 90 °C for 30 min, and then slowly add 12.5 g of aluminum nitrate nonahydrat...
Embodiment 2
[0036]Weigh 16.8 g of potassium hydroxide in a beaker, add deionized water to prepare a potassium hydroxide solution with a concentration of 6 wt%, add 20 g of alkali lignin into the potassium hydroxide solution, heat and stir to fully dissolve the lignin in the alkali solution , and then transferred to a 500 mL three-necked round bottom flask equipped with a condenser and a magnet. When the temperature was stabilized at 90 °C, 24 mL of 40% acetaldehyde aqueous solution was added to the solution, and the reaction was stirred at constant temperature for 1 h. 8.6 g of anhydrous piperazine was quickly added to the reaction solution, the temperature was kept at 90 °C, and the magnetic stirring reaction was continued for 2 h to obtain the lignin amine methylated product. Add 160 mg of sodium lauryl sulfate and 16 g of red phosphorus to the lignin hydroxymethylation product, continue stirring and dispersing at 90 °C for 30 min, then slowly add 25.1 g of aluminum nitrate nonahydrate ...
Embodiment 3
[0038] Weigh 8 g of sodium hydroxide in a beaker, add deionized water to prepare a sodium hydroxide solution with a concentration of 4 wt%, add 20 g of high-boiling alcohol lignin into the sodium hydroxide solution, heat and stir to fully dissolve the lignin in lye, and then transferred to a 500 mL three-neck round-bottomed flask equipped with a condenser tube and a magnet. When the temperature was stabilized at 90 °C, 24 mL of 38% formaldehyde aqueous solution was added to the solution, and the reaction was stirred at constant temperature for 1 h. 19.4 g of piperazine hexahydrate was quickly added to the reaction solution, the temperature was kept at 90 °C, and the reaction was continued with magnetic stirring for 2 h to obtain the lignin amine methylated product. Add 200 mg of OP-10 and 20 g of red phosphorus to the lignin hydroxymethylation product, continue stirring and dispersing at 90 °C for 30 min, then slowly add 5.9 g of aluminum chloride and 8.6 g of magnesium nitrat...
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