Flame retardant, flame-retardant PLA composite material and preparation method of flame retardant and flame-retardant PLA composite material
A composite material and flame retardant technology, which is applied in sustainable manufacturing/processing, biological packaging, climate sustainability, etc., can solve the problems of non-environmental protection of flame retardants, deteriorated mechanical properties, and large amount of addition, and achieve excellent Flame retardant performance, improve compatibility, improve the effect of flame retardant performance
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Embodiment 1
[0037] (1) Dissolve 17.4g of arginine in 100mL of distilled water, then slowly dropwise add a low-concentration phytic acid solution (pH 1-6) (concentration 0.1mol / L) to adjust the pH to neutral at room temperature, Ethanol was added to produce a precipitate, which was filtered and dried to a constant weight to obtain product A;
[0038] (2) Add 20.2g of ethanol-hydrolyzed silane coupling agent KH-550 to product A for reaction, heat at 70°C and stir for 0.5h, the stirring speed is 100rpm, add ethanol, filter, wash and dry to obtain a flame retardant, the product The rate is 76%.
[0039] 0.5g (1.0wt% addition) of the flame retardant obtained in Example 1 and 49.5g of dried pure PLA were evenly mixed and put into an internal mixer for melt blending processing. The processing temperature was 180° C., and the time was 9min. The measured LOI of the flame-retardant PLA composite material is 25.6, the vertical burning rating is FV-2 (3mm), and the tensile strength is 85.5 MPa.
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Embodiment 2
[0046] (1) Dissolve 15.5g of histidine in 100mL of distilled water, then slowly add dropwise a low-concentration phytic acid solution (pH 1-6) (concentration 0.1mol / L) to adjust the pH to neutral at room temperature, Acetonitrile was added to produce a precipitate, which was filtered and dried to a constant weight to obtain product A;
[0047] (2) Add 20.2g of ethanol-hydrolyzed silane coupling agent KH-570 to product A for reaction, heat at 90°C and stir for 0.5h, the stirring speed is 400rpm, filter and wash with ethanol and dry to obtain a flame retardant, the yield was 74%.
[0048] 0.5g (1.0wt% addition) of the flame retardant obtained in Example 2 and 49.5g of dried pure PLA were evenly mixed and then put into an internal mixer for melt blending processing. The processing temperature was 170° C., and the time was 10min. The measured LOI of the flame-retardant PLA composite material is 24.8, the vertical burning rating is FV-0 (3mm), and the tensile strength is 81.6 MPa...
Embodiment 3
[0050] (1) Dissolve 14.6g of lysine in 100mL of distilled water, then slowly add dropwise a low-concentration phytic acid solution (pH 1-6) (concentration 0.1mol / L) to adjust the pH to neutral at room temperature, Add acetonitrile to precipitate, filter and dry to constant weight to obtain product A; (2) Add 20.2 g of ethanol-hydrolyzed silane coupling agent KH-570 to product A for reaction, heat at 90°C and stir for 0.5 h, the stirring speed is 50rpm, the flame retardant was obtained after filtering, washing with ethanol and drying, with a yield of 76%.
[0051] Mix 0.5g (1.0wt% added amount) of the flame retardant obtained in Implementation 3 with 49.5g of dried pure PLA and put them into an internal mixer for melt blending processing at a temperature of 185°C for 8 minutes . The measured LOI of the flame-retardant PLA composite is 24.4, the vertical burning rating is no rating (3mm), and the tensile strength is 81.8 MPa.
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