Preparation method of pure crystalline sorbitol polyether polyol

A technology for crystallizing sorbitol and polyether polyol, which is applied in the field of preparation of rigid foam polyether polyol, can solve problems such as the inability to meet the market demand of functional requirements, and achieve the effects of low cost, high functionality and stable supply of raw materials

Inactive Publication Date: 2016-11-23
ZIBO DEXIN LIANBANG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyether with a functionality of 6 on the market is generally obtained by polymerizing sucrose (with a functionality of 8) and low functionality such as glycerin, water, etc., with propylene oxide in a certain proportion. There are a large number of small molecular substances in this polyether , the functionality ranges from 2 to 8, and the average functionality is 6, so there is a certain gap in performance with pure crystalline sorbitan polyether, and it cannot meet the market demand for higher functionality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 400g of pure crystalline sorbitol and 3.5g of potassium hydroxide into a 5-liter stainless steel kettle for nitrogen replacement. After the oxygen content in the kettle is measured to be less than 100ppm, vacuumize to -0.09MPa, heat up to 90°C, and start adding 115g of propylene oxide , keep the temperature in the kettle at about 100°C, and the pressure at 0.5MPa. After the pressure is stable, add 230g of propylene oxide, keep the temperature in the kettle at about 120°C, and the pressure at 0.5MPa. After the pressure is stable, add the remaining 805g of propylene oxide, 120 ℃, pressure 0.3MPa, after feeding, internal pressure reaction for 4 hours, refining to obtain pure crystalline sorbitan polyether polyol, molecular weight 700, functionality 5.90, hydroxyl value 480mgKOH / g.

Embodiment 2

[0018] Add 400g of pure crystalline sorbitol and 6.6g of potassium hydroxide into a 5-liter stainless steel kettle for nitrogen replacement. After the oxygen content in the kettle is measured to be less than 100ppm, vacuumize to -0.09MPa, heat up to 140°C, and start adding 180g of propylene oxide , keep the temperature in the kettle at about 140°C, and the pressure at 0.5MPa. After the pressure is stable, add 360g of propylene oxide, keep the temperature in the kettle at about 130°C, and the pressure at 0.4MPa. After the pressure is stable, add the remaining 1260g of propylene oxide to keep The temperature in the kettle is about 120°C, the pressure is 0.4MPa, after the feeding is completed, the internal pressure is reacted for 2 hours, and the pure crystalline polyether polyol can be obtained after refining, with a molecular weight of 1000, a functionality of 5.93, and a hydroxyl value of 336mgKOH / g .

Embodiment 3

[0020] Add 150g of pure crystalline sorbitol and 9.8g of potassium hydroxide into a 5-liter stainless steel kettle for nitrogen replacement. After the oxygen content in the kettle is measured to be less than 100ppm, vacuumize to -0.09MPa, heat up to 130°C, and start adding 311g of propylene oxide , keep the temperature in the kettle at about 145°C, and the pressure at 0.6MPa. After the pressure is stable, add 622g of propylene oxide, keep the temperature in the kettle at about 120°C and 145°C, and the pressure at 0.5MPa. After the pressure is stable, add the remaining 2177g of propylene oxide , keep the temperature in the kettle at about 110°C, and the pressure at 0.3MPa. After the feeding is completed, the internal pressure reaction is carried out for 3 hours, and the pure crystalline sorbitan polyether polyol can be obtained after refining. The molecular weight is 4000, the functionality is 5.89, and the hydroxyl value is 85mgKOH / g.

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Abstract

The invention relates to a preparation method of pure crystalline sorbitol polyether polyol, and belongs to the technical field of rigid-foam polyether polyol. The preparation method of pure crystalline sorbitol polyether polyol comprises the steps that pure crystalline sorbitol serves as an initiator, alkali metal serves as a catalyst, the initiator and epoxypropane are subjected to a three-stage polymerization reaction at the certain pressure and temperature, and pure crystalline sorbitol polyether polyol is obtained. The method is simple and easy to carry out, raw material supply is stable, safety and environment protection are achieved, and prepared polyether polyol has the advantages of being high in degree of functionality, low in cost, diversified and the like and can meet different user requirements.

Description

technical field [0001] The invention relates to a preparation method of pure crystalline sorbitol polyether polyol, which belongs to the technical field of preparation of rigid foam polyether polyol. Background technique [0002] Generally, the reaction between pure crystalline sorbitol and propylene oxide needs to be carried out in the presence of a solvent or a functionality regulator such as propylene glycol, glycerin, water, etc., and the product obtained by the reaction has a functionality of 3-5. The polyether with a functionality of 6 on the market is generally obtained by polymerizing sucrose (with a functionality of 8) and low functionality such as glycerin, water, etc., with propylene oxide in a certain proportion. There are a large number of small molecular substances in this polyether , the functionality ranges from 2 to 8, and the average functionality is 6, so there is a certain gap in performance with pure crystalline sorbitan polyether, and it cannot meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48
CPCC08G18/4829C08G65/2609C08G65/2696C08G2110/0025
Inventor 耿佃勇董伟荆晓东孙言丛贾飞
Owner ZIBO DEXIN LIANBANG CHEM IND
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