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Pyrimidyl polyether as well as preparation method and application thereof

A technology of pyrimidine-based polyether and polyether polyol, which is applied in the field of an important raw material of polyurethane foam, can solve the problems that have not occurred, and achieve the effects of reducing dosage, good fluidity, and avoiding delamination.

Active Publication Date: 2022-03-04
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But not in the field of polyurethane foam

Method used

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  • Pyrimidyl polyether as well as preparation method and application thereof
  • Pyrimidyl polyether as well as preparation method and application thereof
  • Pyrimidyl polyether as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Add 300g of ethanol to a 1000ml three-neck flask, then add 10.21g of sodium ethoxide in batches, and stir vigorously until the sodium ethoxide is completely dissolved. Then, 218.1 g (1.1 mol) of 1-(2-guanidineethyl) azacyclooctane and 130 g (1 mol) of ethyl acetoacetate were respectively added into the flask, and refluxed at 82° C. for 10 h. Add 30% hydrochloric acid, neutralize to Ph4-5, filter to obtain the crude compound C1, and recrystallize with ethanol to obtain 207g of pyrimidine derivative C1 with a purity of 99.5% and a yield of 78%.

[0082]

[0083] (2) The secondary amine group in the pyrimidine derivative directly initiates the ring-opening polymerization of propylene oxide: add 132g (0.5mol) of compound C1 into a 3L white steel reactor, and use N 2 After the replacement is qualified, the temperature of the reaction kettle is raised to 100°C, and propylene oxide (290g, 5mol) is continuously added dropwise to the kettle, and at the same time, the mixe...

Embodiment 2

[0086] (1) Add 400g of isopropanol to a 1000ml three-necked flask, then add 20.52g of sodium isopropoxide in batches, and stir vigorously after the sodium isopropoxide is completely dissolved. Then, 396 g (1.5 mol) of dodecylguanidine hydrochloride and 144 g (1 mol) of ethyl propionoacetate were respectively added into the flask, and the mixture was refluxed at 82° C. for 10 h. Add 30% hydrochloric acid, neutralize to Ph4-5, filter to obtain the crude compound J, and recrystallize with isopropanol to obtain 265.2g of pyrimidine derivative C2 with a purity of 99.5% and a yield of 85%.

[0087] The structural formula of gained pyrimidine derivative is:

[0088]

[0089] (2) The secondary amine group in the pyrimidine derivative directly initiates tetrahydrofuran for ring-opening polymerization: add 187.2 g (0.6 mol) of compound C2 into a 2L white steel reactor, and use N 2 After the replacement is qualified, the temperature of the reaction kettle is raised to 130°C, and tetr...

Embodiment 3

[0093] (1) Add 600g of K to a 1000ml three-necked flask 2 CO 3 solution (10% concentration), and then respectively add 113.27g (1.3mol) 1-ethylguanidine and 192.21g (1mol) ethyl benzoylacetate into the flask, and reflux at 100°C for 4h. Add 30% hydrochloric acid, neutralize to Ph4-5, filter to obtain the crude compound C3, and recrystallize with n-butanol to obtain 176.3g of pyrimidine derivative C3 with a purity of 98.7% and a yield of 82%.

[0094] The structural formula of gained pyrimidine derivative is:

[0095]

[0096] (2) The secondary amine group in the pyrimidine derivative directly initiates the ring-opening polymerization of propylene oxide: add 129g (0.6mol) of compound C3 into a 5L white steel reactor, and use N 2 After the replacement is qualified, the temperature of the reaction kettle is raised to 115°C, and propylene oxide (1044g, 18mol) is continuously added dropwise into the kettle. The pressure is reduced to -0.05Mpa, and the heat preservation is con...

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Abstract

The invention provides pyrimidyl polyether polyol as well as a preparation method and application thereof.The pyrimidyl polyether polyol is prepared by the steps that a 1, 3-dicarbonyl compound A and a diamino compound B are subjected to a condensation reaction to obtain a pyrimidine derivative C with secondary amine and hydroxyl, then the pyrimidine derivative C with the secondary amine and hydroxyl and alkylene oxide are subjected to a ring-opening polymerization reaction, and the pyrimidyl polyether polyol is obtained. The polyether polyol disclosed by the invention not only can be well dissolved with water, but also can be well dissolved with other polyether polyols, can play a compatibilization effect of a surfactant, and is low in viscosity, high in water solubility, high in water solubility and high in water solubility. And the pyrimidine ring also enables the foamed foam to have strong dimensional stability, good mechanical properties such as compression strength and the like and good flame retardant effect, can improve the thermal insulation property of the foam, and can be used for a polyurethane all-water foaming system.

Description

technical field [0001] The invention relates to an important raw material of polyurethane foam, in particular to a pyrimidine-based polyether polyol, its preparation method and its application in a polyurethane all-water foaming system. Background technique [0002] Polyurethane rigid foam is widely used in refrigerators, pipe insulation, solar water heaters, cold storage insulation, building insulation and other fields due to its excellent thermal insulation performance and good processing performance. However, the traditional method is generally made by foaming polyether polyol and isocyanate under the condition of chlorofluorocarbon compound as a blowing agent. Although the foam made by CFC blowing agent has excellent physical properties, it has been completely banned because of its destructive effect on the atmospheric ozone layer. HCFC and other blowing agents have widely replaced CFC blowing agents in recent years. HCFC blowing agents Although it also has foaming perf...

Claims

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Application Information

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IPC IPC(8): C08G65/28C08G18/50C08G18/18C08G101/00
CPCC08G65/263C08G18/506C08G18/1808
Inventor 丁宗雷高杭张文清滕向刘大伟刘赵兴张聪颖刘振国孙中平尚永华孙立冬
Owner WANHUA CHEM GRP CO LTD