Method for preparing natural fiber/polylactic acid composite material with anti-flaming function
A natural fiber and composite material technology, which is applied in the field of preparation of natural fiber/polylactic acid composite materials, can solve the problems of reducing the mechanical properties of natural fiber/polylactic acid composite materials, adding a large amount, and low flame retardant efficiency of hydroxides. , to achieve the effect of simple preparation method, avoid secondary combustion, and improve flame retardant performance
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Embodiment 1
[0024] (1) Soak ramie fibers with an aspect ratio of 5 in an aqueous solution of 0.1 wt% silane coupling agent (KH570) for 24 hours, then dry them to obtain surface-modified natural fibers.
[0025] (2) Soak the surface-modified ramie fiber obtained in step (1) in an ethanol solution of 5 wt % ammonium polyphosphate (APP) for 12 hours, perform flame retardant treatment, and finally dry.
[0026] (3) Vacuum dry the polylactic acid and the flame retardant ammonium polyphosphate at 30° C. for 24 hours to remove moisture.
[0027] (4) polylactic acid after the treatment that step (3) obtains and ammonium polyphosphate, antioxidant tris (2,4-di-tert-butylphenyl) ester are evenly mixed according to a certain ratio, and then in the twin-screw The reaction is carried out in an extruder, and the product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of ammonium polyphosphate is 20wt%, the content of antioxidant is 2wt%, the content of p...
Embodiment 2
[0031] (1) Soak the jute fiber with an aspect ratio of 100 in an aqueous solution of 5 wt % silane coupling agent (KH570) for 1 hour, then dry it to obtain surface-modified natural fibers.
[0032] (2) Soak the surface-modified jute fiber obtained in step (1) in an ethanol solution of 0.1 wt% ammonium polyphosphate (APP) for 24 hours, carry out flame-retardant treatment, and finally dry.
[0033] (3) The polylactic acid and the flame retardant ammonium polyphosphate were vacuum-dried at 120° C. for 1 hour to remove moisture.
[0034] (4) polylactic acid after the treatment that step (3) obtains and ammonium polyphosphate, antioxidant tris (2,4-di-tert-butylphenyl) ester are evenly mixed according to a certain ratio, and then in the twin-screw The reaction is carried out in an extruder, and the product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of ammonium polyphosphate is 5wt%, the content of antioxidant is 0.1wt%, the cont...
Embodiment 3
[0038] (1) Soak flax fibers with an aspect ratio of 50 in an aqueous solution of 1 wt% silane coupling agent (KH560) for 5 hours, and then dry them to obtain surface-modified natural fibers.
[0039] (2) Soak the surface-modified jute fiber obtained in step (1) in an ethanol solution of ammonium polyphosphate (APP) with a concentration of 2.5 wt% for 24 hours, carry out flame-retardant treatment, and finally dry.
[0040] (3) The polylactic acid and the flame retardant melamine were vacuum-dried at 60° C. for 10 hours, respectively, to remove moisture.
[0041] (4) the treated polylactic acid obtained in step (3) and flame retardant melamine, antioxidant phenylene diisodecyl phosphite are uniformly mixed according to a certain ratio, and then reacted in a twin-screw extruder, The product is cooled, pelletized, and dried to obtain flame-retardant polylactic acid. Wherein the content of melamine is 30wt%, the content of antioxidant is 0.5wt%, the content of polylactic acid is 6...
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