Phosphated lignin-based flame-retardant and reinforced rigid polyurethane foam and preparation method thereof
A polyurethane rigid foam, lignin-based technology, applied in the field of foam materials, can solve the problems of polyurethane foam not having flame retardant properties, low reactivity of flame retardants, easy migration, etc., to reduce the heat release rate and enhance the mechanical properties. , Improve the effect of flame retardant performance
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Embodiment 1
[0044] (1) Raw material preparation:
[0045] Preparation of anhydrous phosphoric acid solution: mix 50% phosphorus pentoxide, 30% phosphoric acid and 20% hexanol by mass percentage to prepare anhydrous phosphoric acid solution;
[0046] Preparation of degradable liquefaction agent: Mix 20 parts of degradable polyol and 10 parts of glycerol prepared by polyethylene glycol and polycaprolactone at a mass ratio of 1:3;
[0047] (2) Preparation of Phosphated Lignin:
[0048] Add 10 parts of alkali lignin into 100ml of formaldehyde alkaline solution, heat up and react for 3 hours, then adjust the pH value to acidic with acid, then add 50ml of anhydrous phosphoric acid solution, stir for 60 hours, and dry to obtain phosphide; then the phosphide is stirred Add it into 30 parts of degradable liquefaction agent, heat and react for 0.5h in the presence of a catalyst, adjust the pH value of the solution to neutral with alkali, and obtain the phosphated lignin liquefaction product;
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Embodiment 2
[0053] (1) Raw material preparation:
[0054] Preparation of anhydrous phosphoric acid solution: mix 60% phosphorus pentoxide, 20% phosphoric acid and 20% hexanol by mass percentage to prepare anhydrous phosphoric acid solution;
[0055] Preparation of degradable liquefaction agent: Mix 20 parts of degradable polyol and 10 parts of glycerol prepared by polyethylene glycol and polycaprolactone at a mass ratio of 1:3;
[0056] (2) Preparation of Phosphated Lignin:
[0057] Add 20 parts of alkali lignin into 120ml of formaldehyde alkaline solution, heat up and react for 3 hours, then adjust the pH value to acidic with acid, then add 50ml of anhydrous phosphoric acid solution, stir for 60 hours, and dry to obtain phosphide; then the phosphide is stirred Add it to 30 parts of degradable liquefaction agent, heat and react for 1 hour in the presence of a catalyst, adjust the pH value of the solution to neutral with alkali, and obtain phosphated lignin liquefaction;
[0058] (3) Pre...
Embodiment 3
[0062] (1) Raw material preparation:
[0063] Preparation of anhydrous phosphoric acid solution: mix 60% phosphorus pentoxide, 25% phosphoric acid and 15% hexanol by mass percentage to prepare anhydrous phosphoric acid solution;
[0064] Preparation of degradable liquefaction agent: Mix 25 parts of degradable polyol and 10 parts of glycerol prepared by polyethylene glycol and polycaprolactone at a mass ratio of 1:3;
[0065] (2) Preparation of Phosphated Lignin:
[0066] Add 30 parts of calcium lignosulfonate to 120ml of formaldehyde alkaline solution, heat up and react for 4 hours, then adjust the pH value to acidic with acid, then add 80ml of anhydrous phosphoric acid solution, stir for 70 hours, and dry to obtain phosphide; then the phosphide Add it into 35 parts of degradable liquefaction agent under stirring, heat and react for 1 hour in the presence of a catalyst, adjust the pH value of the solution to neutral with alkali, and obtain the phosphated lignin liquefaction p...
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