Method for recycling polyhydric alcohol by degrading thermal-insulation polyurethane foam materials for buildings

A polyurethane foam and thermal insulation material technology, applied in the chemical industry, can solve problems such as high requirements for reaction conditions and equipment, restrictions on the popularization and application of phosphorus degradation methods, and complex composition of decomposition products, and achieve low cost, protection of waste disposal problems, and foam performance good effect

Inactive Publication Date: 2013-06-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrolysis, monohydric alcoholysis, and ammonolysis are carried out under high temperature and high pressure, so the requirements for reaction conditions and equipment are very high, and the composition of the decomposition products is complex, and the purification technology is very difficult, so this method has not been promoted; alkaline hydrolysis The reaction is carried out under the condition of high temperature and strong alkali, which requires high equipment, high production cost, and it is difficult to realize industrialization; the product obtained by the phosphorus degradation method has more phosphorus, which can be used as a filler to increase the flame retardancy of the product, and the phosphorus degradation product Preparation of rigid polyurethane foam as a filler has higher density and better mechanical properties, but further research is needed
Moreover, phosphorus degradation products are mainly used as fillers, and the amount of products used is also very limited, which limits the popularization and application of phosphorus degradation methods; there are no application examples for acid hydrolysis and enzymatic hydrolysis, and they are still in the initial research stage; alcoholysis is the current chemical recovery of polyurethane The most widely used method, alcoholysis is a chemical method best suited for the recycling of rigid polyurethane foam

Method used

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  • Method for recycling polyhydric alcohol by degrading thermal-insulation polyurethane foam materials for buildings
  • Method for recycling polyhydric alcohol by degrading thermal-insulation polyurethane foam materials for buildings
  • Method for recycling polyhydric alcohol by degrading thermal-insulation polyurethane foam materials for buildings

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of method of producing recycled polyols and reproducing foaming of a kind of building insulation polyurethane foam material waste material of the present embodiment, comprises the following steps:

[0026] 1. Add diethylene glycol, monoethanolamine, calcium chloride, and BHT into the reactor, heat up until the liquid temperature in the reactor reaches 170°C, and then add waste materials into the reactor one by one. The number of additions is 3 times, the mass ratio of the addition of insulation material waste material, diethylene glycol, monoethanolamine, calcium chloride, and BHT five is 100:50:12:0.3:2, heating and stirring to heat up, and the reaction temperature is controlled at 210°C, react for 3 hours, filter out unreacted solid impurities, cool, and the obtained liquid is polyol;

[0027] The above method was used to obtain a polyhydric alcohol with a hydroxyl value of 508 mgKOH / g and an acid value of 1.56 gKOH / g.

[0028] 2. Use the above-mentioned degra...

Embodiment 2

[0030] A kind of method of producing recycled polyols and reproducing foaming of a kind of building insulation polyurethane foam material waste material of the present embodiment, comprises the following steps:

[0031] 1. Add dipropylene glycol, triethanolamine, zinc acetate, and BHA into the reactor, heat up until the liquid temperature in the reactor reaches 140°C, then add waste materials into the reactor one by one, the number of additions is 10 times, The amount of insulation material waste added, the mass ratio of dipropylene glycol, triethanolamine, zinc acetate, and BHA is 100:150:10:0.5:0.5, heating and stirring to raise the temperature, and the reaction temperature is controlled at 175 ° C. React for 5 hours and filter Unreacted solid impurities are removed, cooled, and the obtained liquid is polyol;

[0032] The above method was used to obtain a polyhydric alcohol with a hydroxyl value of 498 mgKOH / g and an acid value of 1.29 gKOH / g.

[0033] 2. Replace 50% of pol...

Embodiment 3

[0035] A kind of method of producing recycled polyols and reproducing foaming of a kind of building insulation polyurethane foam material waste material of the present embodiment, comprises the following steps:

[0036] 1. Add propylene glycol, diethylene glycol, sodium hydroxide, and TBHQ into the reactor, heat up until the liquid temperature in the reactor reaches 150°C, then add waste materials into the reactor one by one, the number of additions is 5 times, The amount of insulation material waste added, the mass ratio of propylene glycol, diethylene glycol, sodium hydroxide, and TBHQ is 100:100:2.5:0.2:1, heating and stirring to raise the temperature, the reaction temperature is controlled at 160 ° C, and the reaction is 8 hours. Filter out unreacted solid impurities, cool, and the obtained liquid is polyol;

[0037] The above method was used to obtain a polyhydric alcohol with a hydroxyl value of 482 mgKOH / g and an acid value of 0.98 gKOH / g.

[0038] 2. Use the above-men...

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Abstract

The invention relates to a method for recycling polyhydric alcohol by taking waste materials of thermal-insulation polyurethane foam materials for buildings and reproducing polyurethane foams. The method comprises the steps of adding proper amounts of antioxidants, alcoholysis agents, alcoholysis assistant agents and catalysts in presence of oxygen (in atmosphere which is not protected by inert gas), and recycling the thermal-insulation foam materials for the buildings. The hydroxyl value, acid value and the like of the polyhydric alcohol recycled by utilizing the method are all accordant with government standards. The recycled polyhydric alcohol can be used for partially replacing polyether polyol to reproduce the polyurethane foams. Compared with previous inventions, the method has the advantages that (1) in the atmosphere which is not protected by the inert gas, the industrial production process is simple, and the cost is saved; (2) the degraded polyhydric alcohols in the method are solid materials on an upper layer and a lower layer, and the separation is simple; and (3) the recycled polyhydric alcohol can be used for directly replacing the polyether polyol with a mass fraction of 20-50% to reproduce the polyurethane foams, and the foam property is good.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recovering polyols through a degradation process of thermal insulation polyurethane foam materials used in buildings, and the foam performance of degraded alcohols replacing part of polyether polyols for refoaming. Background technique [0002] Since the German chemist Bayer discovered the chemical reaction between isocyanate and active hydrogen in 1937, he started the chemical and application research of polyurethane. After more than 60 years, a vigorous polyurethane industry has been formed. Polyurethane has developed rapidly. After the 1880s, the amount of polyurethane materials used in the national economy has increased, and its uses have become wider and wider, and its wastes have also increased. Polyurethane materials cannot be degraded naturally, and the pollution of these wastes to the environment has become increasingly prominent. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08J11/28C08G18/40C08G18/32
CPCY02W30/62
Inventor 刘晓非彭钦孟庆颖吴皓
Owner TIANJIN UNIV
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