Method for preparing biodegradable polyurethane rigid foam from bamboo waste liquefaction products
A technology of liquefaction products and rigid foams, which is applied in the field of material chemical industry, can solve the problems of expensive liquefaction agents, etc., and achieve the effects of mitigating energy and environmental crises, mild reaction conditions, and good liquefaction effects
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Embodiment 1
[0021] Add 80 kg of polyethylene glycol 400, 20 kg of crude glycerin, and 2 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing reflux device, start the agitator, heat to 160 ° C, and add 30 kg of crushed and dried The bamboo chips of the 2-year-old Phyllostachys moso bamboo of 80 mesh sieves, after stirring and reacting for 3 hours, take out and cool.
[0022] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 4 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 150 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.
Embodiment 2
[0024] Add 70 kg of polyethylene glycol 400, 30 kg of crude glycerin, and 5 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing reflux device, start the agitator, heat to 160 ° C, and add 30 kg of crushed and dried The bamboo chips of the perennial moso bamboo of 80 mesh sieves, after stirring and reacting for 1.5 hours, add 4 kilograms of FeSO4, take out cooling after continuing to react for 1 hour.
[0025] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 5 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 140 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.
Embodiment 3
[0027] Add 60 kg of polyethylene glycol 400, 40 kg of crude glycerin, and 4 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing and reflux device, start the agitator, heat to 160 ° C, and add 25 kg of crushed and dried The bamboo chips of the 3-year-old Phyllostachys moso bamboo of 80 mesh sieves, after stirring and reacting for 3 hours, take out and cool.
[0028] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 3 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 130 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.
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