Method for preparing flame-retardant polypropylene by in-situ coating of modified ammonium polyphosphate
A technology for coating ammonium polyphosphate and flame retardant polypropylene, which is applied in the field of flame retardant materials, can solve the problems of cumbersome preparation process, reduced water absorption, flammability, etc., and achieves simple preparation process, improved flame retardant effect, and improved flame retardant. performance effect
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Embodiment 1
[0024] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.
[0025] Mix 20g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 10g of pentaerythritol phosphate for compounding, and put the obtained intumescent flame retardant into a mixer together with 70g of polypropylene, and heat it at 180°C and 50r / min Knead ...
Embodiment 2
[0029] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.
[0030]Mix 22.5g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 7.5g of pentaerythritol phosphate for compounding. The resulting intumescent flame retardant is put into a mixer together with 70g of polypropylene, and mixed at 180°C and 50r / min speed...
Embodiment 3
[0033] Add 140mL of absolute ethanol into the reaction kettle at room temperature, then add 14g of bisphenol A epoxy resin and 2g of triethylenetetramine, and stir to disperse evenly. Continue to add 60 g of dried ammonium polyphosphate and 0.6 g of dried montmorillonite to the mixture, and stir again for 30 min. Then the mixture was heated to 40° C., stirred at this temperature for 1 h, continued to be heated to 70° C., and reacted at this temperature for 1 h. After the reaction, filter with suction, wash the filter cake fully with distilled water, collect the product and transfer it to a vacuum drying oven, and dry it at 80°C for 48 hours to obtain epoxy resin-coated ammonium polyphosphate microcapsules.
[0034] Mix 24g of dried epoxy resin-coated ammonium polyphosphate microcapsules with 6g of pentaerythritol phosphate for compounding. The obtained intumescent flame retardant is put into a mixer together with 70g of polypropylene, and mixed at 180°C and 50r / min Knead for ...
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