Method for preparing core-shell synergistic magnesium zinc composite flame retardants
A composite flame retardant and flame retardant technology are applied in the field of preparation of core-shell synergistic magnesium-zinc composite flame retardants, which can solve the problems of poor mechanical properties and low flame retardant efficiency of polymer composite materials, and achieve improved mechanical properties. performance, enhance interaction, enhance the effect of specific surface area
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Embodiment 1
[0018] Take 10kg of 5000mesh magnesium hydroxide powder and place it in a reactor, add 20L of water to make a slurry, then take 30L of aqueous solution containing 5.5kg of borax and add it to the reactor at one time, keep stirring at 150r / min and heat to 90°C. Insulate for 30 minutes; then add 30L aqueous solution dissolved with 4.1kg of zinc sulfate heptahydrate, keep the temperature and stir for 6 hours, during this period use 4mol / L sodium hydroxide solution to control the reaction pH at 8.0, filter and wash the product after the reaction is completed, and dry it A fluffy composite flame retardant product is obtained. When the product is applied to EVA plastic, when the filling amount is less than 60wt%, the tensile strength is greater than 10.00MPa, and the elongation at break is greater than 150%, which meets the national requirements for cable sheath materials; the filling amount is 45wt%. Burning UL94-V0 level. Its performance is better than the simple mixed flame reta...
Embodiment 2
[0022] Take 12kg of 6000 mesh basic magnesium carbonate powder and put it in the reactor, add 25L of water to make a slurry, then take 20L of aqueous solution containing 2.5kg of borax and add it to the reactor at one time, keep stirring at 250r / min and heat to 90°C And keep it warm for 30 minutes; then add 15L aqueous solution containing 2.1kg of zinc nitrate, keep the temperature and stir for 12 hours, during which the reaction pH is controlled at 8.0 with 4mol / L sodium hydroxide solution, after the reaction is completed, filter and wash the product, and dry it to get Fluffy composite flame retardant product. When the product is applied to EVA plastic, the tensile strength is greater than 10.00MPa when the filling amount is less than 60wt%, and the elongation at break is greater than 150%, which meets the national requirements for cable sheath materials; the filling amount of 50wt% meets the resistance Burning UL94-V0 level.
Embodiment 3
[0024] Take 10 kg of 325 mesh basic magnesium carbonate powder and place it in a reactor, add 30 L of water to make a slurry, then take 20 L of aqueous solution dissolved with 2.4 kg of potassium tetraborate and add it to the reactor at one time, keep stirring at 250 r / min and heat to 90°C and keep warm for 30min; then add 10L aqueous solution containing 1.6kg of zinc acetate, keep the temperature and stir for 16h, during which the reaction pH is controlled at 8.0 with 4mol / L sodium hydroxide solution, after the reaction is completed, the product is filtered and washed, and dried A fluffy composite flame retardant product can be obtained. When the product is applied to EVA plastic, when the filling amount is less than 60wt%, the tensile strength is greater than 10.00MPa, and the elongation at break is greater than 150%, which meets the national requirements for cable sheath materials; the filling amount is 48wt%. Burning UL94-V0 level.
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