Method for preparing polyether polyol by hydrothermal catalytic degradation of waste hard polyurethane material
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A technology of rigid polyurethane and polyether polyol, which is applied in the direction of plastic recycling and recycling technology, which can solve the problems of high cost and long process route, and achieve the effects of high conversion rate, simple equipment and operation, and high yield
Pending Publication Date: 2019-12-03
CHANGCHUN UNIV OF TECH
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The quality of the polyether polyol obtained by this method is close to that of the original polyether polyol, which can be directly used in the production of polyurethane foam, but the process route is longer and the cost is higher
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Embodiment 1
[0040] Add 50.0g waste rigid polyurethane powder (0.05mm, reclaimed material of refrigerator insulation board) in 500ml hydrothermal kettle, add 150.0g ethylene glycol liquefaction agent again, add depolymerization catalyst stannous octoate 1.0g, the temperature of reaction kettle Control at 200°C, react for 4 hours, cool, filter, and recover excess ethylene glycol by distillation to obtain liquefied polyether polyol.
[0041] It is determined that the hydroxyl value of the polyether polyol is 327 mgKOH / g, and the liquefaction rate of the polyurethane is 100%.
Embodiment 2
[0043] Add 50.0g waste polyurethane hard foam (0.05mm, reclaimed material of refrigerator insulation board) in 500ml hydrothermal kettle, add 150.0g propylene glycol again, add dibutyltin dilaurate 1.5g (3.0%), the temperature of reactor is controlled at 200°C, react for 6 hours, cool, filter, and recover excess propylene glycol by distillation to obtain liquefied polyether polyol.
[0044] The calculated hydroxyl value of the polyether polyol is 312 mgKOH / g, and the liquefaction rate of the polyurethane is 100%.
Embodiment 3
[0046] Add 50.0g waste rigid polyurethane powder (0.05mm, reclaimed material of refrigerator insulation board) in 500ml hydrothermal kettle, then add the petroleum-based polyether polyol of 125.0g trifunctionality, add depolymerization catalyst stannous octoate 0.4g, Control the temperature of the reactor at 200° C., react for 6 hours, cool, and filter to obtain liquefied polyether polyol.
[0047] The calculated hydroxyl value of polyether polyol is 398 mgKOH / g, and the degradation rate of polyurethane is 100%.
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Abstract
The invention provides a method for preparing polyether polyol by hydrothermal catalytic degradation of a waste hard polyurethane material. The method comprises the following steps: (1) adding waste hard polyurethane into a crusher for crushing the waste hard polyurethane to obtain hard polyurethane powder; (2) adding the hard polyurethane powder into a reaction kettle, and adding a certain amountof liquefying agent and depolymerization catalyst, wherein the mass ratio of the liquefying agent to the hard polyurethane is 1-4: 1, and the depolymerization catalyst accounts for 0.8-3.5% of the total mass of the hard polyurethane; and (3) heating to the temperature of 180-240 DEG C, reacting for 2-12 h, cooling the product to the room temperature after the reaction is finished, and filtering to obtain liquefied polyether polyol. According to the method, the polyether polyol is prepared by catalytic degradation of a catalytic solvothermal technology, the process is simple, the conversion rate is high, and the method is a green way for high-quality utilization of waste polyurethane; the used catalyst does not need to be recycled, remains in the reaction product, and is used as a catalystfor further synthesizing the polyurethane material; and used equipment and operation are simple, the depolymerization rate of the waste polyurethane is high, and the yield of the polyether polyol product is high.
Description
technical field [0001] The invention relates to the technical field of utilization of renewable resources, in particular to a method for preparing polyether polyols through hydrothermal catalytic degradation of waste rigid polyurethane materials. Background technique [0002] With the increasing popularity of polyurethane materials and products in industrial production, national defense and daily life, they are widely used in automobile manufacturing, refrigerator manufacturing, transportation, civil engineering, footwear, synthetic leather, fabrics, electromechanical, mining machinery, petrochemical , aerospace, medical, agriculture and many other fields. Polyurethane has become one of the bulk polymer materials (the market consumption of polyurethane products in my country was 13 million tons in 2108), and how to deal with the resulting waste polyurethane has attracted worldwide attention. It has become one of the key issues in the field of resource utilization of polymer...
Claims
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