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Method and device for producing polyester polyol, polyester polyol and polurethane foam

A technology of polyester polyol and polyol, which is applied in the field of polyurethane foam and equipment for producing polyester polyol, can solve problems such as increased viscosity, complicated equipment, and white turbidity of polyester polyol, so as to improve production efficiency and realize Efficient utilization and environmental friendliness

Inactive Publication Date: 2002-03-13
MITSUI CHEM & SKC POLYURETHANES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sufficient ethylene glycol is stripped, since the stripped ethylene glycol is post-treated as it is, the raw material cannot be effectively utilized, and it is difficult to achieve extensive improvement in production efficiency
Meanwhile, since the stripped ethylene glycol is post-treated as it is, the method is complicated and requires related equipment
In addition, although the obtained polyester polyol maintained its normal quality during the initial expected period after production, in connection with the production of diethylene glycol and other at least one of these oxyalkylene diols used as raw materials Slight differences in the description can cause the polyester polyol to change over time and thus the polyester polyol may develop white turbidity, increase viscosity or crystallize

Method used

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  • Method and device for producing polyester polyol, polyester polyol and polurethane foam
  • Method and device for producing polyester polyol, polyester polyol and polurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The production of embodiment 1 distillate:

[0059] 500 g of PET bottle fragments IFN-10 (available from ARK Co., Ltd.) and 465 g of diethylene glycol were added to a 1,000 ml four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet tube and a rectification tower, and The reaction was carried out by stirring in the presence of 200 ppm tetrabutoxytitanium at 220-240° C. while injecting nitrogen. The PET bottle fragments started to dissolve at 220°C. The by-product of ethylene glycol was distilled off with nitrogen and after 20 hours the reaction was stopped by cooling. The distillate obtained was 150 g. The composition of the distillate included 6% water, 70% ethylene glycol, 22% diethylene glycol, and 2% dioxane. After forcibly stripping low-boiling content from the distillate at 130° C. with nitrogen over 30 minutes, the distillate became 135 g and had a hydroxyl value of 1,500 mgKOH / g. Modification method:

[0060] 127 g ...

Embodiment 2

[0063] With 200g of PET bottle fragments IFN-10 (available from ARK Co., Ltd.), the modified oxirane solution (hydroxyl value 660mgKOH / g) that 140g obtains in the polyester polyol production method of embodiment, and 140 g of diethylene glycol were added to a 1,000 ml four-necked flask equipped with a stirrer, a thermometer, a nitrogen gas introduction tube, and a rectification tower, and nitrogen was injected at 220-240 ° C in the presence of 200 ppm tetrabutoxytitanium The reaction is carried out by stirring. The PET bottle fragments started to dissolve at 220°C. The by-product of ethylene glycol was distilled off with nitrogen and after 20 hours the reaction was stopped by cooling. The distillate obtained was 70 g. The obtained polyester polyol was a transparent brown liquid having a hydroxyl value of 310 mgKOH / g and a viscosity of 1,800 mPas / 25°C. None of white turbidity, increased viscosity, and crystallization occurred in the polyester polyol after storage at room tem...

Embodiment 3

[0065] After adding 30 g of diethylene glycol to 100 g of the distillate (hydroxyl value 1,500 mgKOH / g) obtained in the distillate production method of Example 1, 1.0 g of potassium hydroxide was chipped at 130° C. Dissolved therein and then continuously added 128 g of propylene oxide to react therewith. After the reaction was finished, 5 g of water and 3.0 g of KYOWAAD 600 (an amphoteric adsorbent available from Kyowa Chemical industry Co., Ltd.) were added in order to remove the added potassium hydroxide. After the dehydration and filtration process was completed, an ethylene glycol mixture with a hydroxyl value of 700 mgKOH / g was obtained.

[0066] Then, 200 g of PET bottle fragments IFN-10 (available from ARK Co., Ltd.) and 260 g of the above-mentioned ethylene glycol mixture were charged into a 1,000 ml four-necked flask equipped with a stirrer, a thermometer, a nitrogen gas introduction tube, and a rectification column. , and the reaction was carried out by stirring whi...

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Abstract

To provide a method for producing polyester polyol that can provide a simple process to produce extensively improved production efficiencies and also produce the polyester polyol of stable in quality, an apparatus for producing the polyester polyol produced by the method, a polyester polyol produced by the method, and a polyurethane foam obtained by use of the polyester polyol produced by the method, polyethylene terephthalate and raw polyol are allowed to react in a reaction vessel to produce polyester polyol and also ethylene glycol which is a by-product of the reaction is distilled off and the distillate is modified, for example by reaction with an alkylene oxide, in a modifying vessel so that it can have a predetermined hydroxyl value and then is fed to the reaction vessel again as the raw glycol, to thereby produce the polyester polyol.

Description

technical field [0001] The present invention relates to a method for producing polyester polyol, to an apparatus for producing polyester polyol using the method, to polyester polyol obtained by the production method, and to polyurethane obtained using the polyester polyol thus produced Foam. Background technique [0002] It is known that a polyester polyol in which an aromatic compound is introduced as a polyol component of a raw material of rigid polyurethane foam can be used to improve the flame retardancy of the rigid polyurethane foam. [0003] These polyester polyols can be obtained by, for example, reacting short-chain diols, such as ethylene glycol and diethylene glycol, and dibasic acids, such as phthalic acid. When terephthalic acid is used as the dibasic acid, the flame retardancy of the rigid polyurethane foam can be improved to a large extent. For this reason, polyester polyols into which terephthalic acid is introduced are widely used as polyol components of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G63/78C08G63/91
CPCC08G2101/0025C08G2101/005C08G63/916C08G18/4252C08G63/785C08G2110/005C08G2110/0025C08G63/78
Inventor 村山公一稻冈克实熊木高志
Owner MITSUI CHEM & SKC POLYURETHANES INC
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