Flame-retardant rigid polyurethane foam
A technology of rigid polyurethane and flame retardancy, which is applied in the field of flame retardants to achieve the effect of simple preparation process and easy operation
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Embodiment 1
[0014] Weigh 84g of polyether polyol (4110), 0.56g of 30% potassium acetate solution, 0.48g of pentamethyldiethylenetriamine, 1.68g of N,N-dimethylcyclohexylamine, and 3.24g of foam stabilizer , distilled water 1.08g, HCFC-141b 18g, TGD6.36g, DMMP 26.4g, aluminum hydroxide 11.1g, zinc hydroxystannate 6.6g, expandable graphite 19.2g, V-ODA 4g, polyisocyanate (PAPI ) 130g, of which V-ODA is to dissolve 8g of 3-methoxy-4-hydroxybenzaldehyde in 100mL ethanol at room temperature, then add 6g of 4,4-diaminodiphenyl ether, stir at 1500r / min for 30min, then heat up Reaction at 70°C for 7h, cooling the resulting reaction solution to room temperature, suction filtration, and vacuum drying the solid at 80°C for 30h;
[0015] Mix and stir polyether polyol, catalyst, blowing agent, and flame retardant at 2000r / min for 90s, then add PAPI and stir for 10s, pour into the mold, and cure at room temperature for 24 hours to obtain free-foaming foam .
Embodiment 2
[0017] Weigh 70g of polyether polyol (4110), 1g of 30% potassium acetate solution, 1g of pentamethyldiethylenetriamine, 3g of N,N-dimethylcyclohexylamine, 3g of foam stabilizer, 2g of distilled water, HCFC-141b 13g, TGD8g, DMMP15g, aluminum hydroxide 18g, expandable graphite 10g, zinc hydroxystannate 5g, V-ODA 5g, polyisocyanate (PAPI) 120g; where V-ODA is 7g of 3- Dissolve methoxy-4-hydroxybenzaldehyde in 110mL of ethanol, add 8g of 4,4-diaminodiphenyl ether, stir at 2000r / min for 40min, heat up to 90°C for 5h, and cool the resulting reaction solution to After suction filtration at room temperature, the solid was vacuum-dried at 70°C for 35 hours;
[0018] Mix polyether polyol, catalyst and flame retardant at a speed of 2200r / min for 70s, then add foaming agent and stir for 20s to obtain a uniform mixture, then add PAPI and stir for 10s, pour into the mold, and cure at room temperature After 24 h, a free foaming foam was obtained.
Embodiment 3
[0020] Weigh 95g of polyether polyol (4110), 0.8g of 30% potassium acetate solution, 0.8g of pentamethyldiethylenetriamine, 2g of N,N-dimethylcyclohexylamine, 2.4g of foam stabilizer, 4g of distilled water, 20g of HCFC-141b, 30g of DMMP, 5g of aluminum hydroxide, 15g of expandable graphite, 15g of zinc hydroxystannate, 10g of V-ODA, 140g of polyisocyanate (PAPI); Dissolve 3-methoxy-4-hydroxybenzaldehyde in 90mL of ethanol, then add 5g of 4,4-diaminodiphenyl ether, stir at 2000r / min for 45min, raise the temperature to 65°C for 7h, and dissolve the obtained reaction solution After cooling to room temperature, it was suction filtered, and the solid was vacuum-dried at 50°C for 40 hours;
[0021] Mix polyether polyol, catalyst and flame retardant at a speed of 2200r / min for 70s, then add foaming agent and stir for 20s to obtain a uniform mixture, then add PAPI and stir for 10s, pour into the mold, and cure at room temperature After 24 h, a free foaming foam was obtained.
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