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Preparation method of sorbitol-based polyether polyol

The technology of sorbitol-based polyether and crude sorbitol-based polyether is applied in the field of preparation of polyether polyol, which can solve the problems of unstable product quality control, unstable preparation process and high hydroxyl value of products, and achieves low cost, The effect of stable product quality and high economic value

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method avoids the problems of unstable product quality control and unstable preparation process caused by high hydroxyl value, low viscosity and dark color of the product in the existing preparation process using liquid sorbitol as the starting agent, and ensures low cost. At the same time, it realizes the advantages of no need to add solvent or regulator in the preparation process, accurate feeding amount, stable preparation process and stable product quality

Method used

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  • Preparation method of sorbitol-based polyether polyol
  • Preparation method of sorbitol-based polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 520g liquid sorbitol (purity 70wt%) and 6g (based on the total weight of liquid sorbitol and all epoxides, consumption is 0.39wt%) potassium hydroxide in 2L stainless steel reactor (distributor is equipped with at the bottom of the still) , carry out nitrogen replacement, after the oxygen content in the test kettle is less than 150ppm, heat up, and at 85°C, gradually add 460g of the first stage of propylene oxide dropwise (based on the total weight of liquid sorbitol and all epoxides, the dosage is 30.3 wt%), after the dropwise addition, react under internal pressure at the reaction temperature for 3 hours, then heat up to 90°C, use nitrogen to carry out bubbling dehydration for 5 hours, sample and analyze the moisture 0.85wt%, continue to heat up to 115°C, drop the second After the addition of 540 g of propylene oxide in the second stage, react under internal pressure at the reaction temperature for 3 hours, pull a vacuum to remove unreacted monomers, cool down and ...

Embodiment 2

[0040]Add 510g liquid sorbitol (purity 70wt%) and 5g potassium hydroxide (based on the total weight of liquid sorbitol and all epoxides, consumption is 0.33wt%) in 2L stainless steel reactor (distributor is equipped with at the bottom of the still) , carry out nitrogen replacement, after the oxygen content in the test kettle is less than 150ppm, heat up, and at 85°C, gradually add 410g of the first stage of propylene oxide dropwise (based on the total weight of liquid sorbitol and all epoxides, the dosage is 26.9 wt%), after the dropwise addition, react under internal pressure at the reaction temperature for 3 hours, then heat up to 90°C, use nitrogen to carry out bubbling dehydration for 5 hours, sample and analyze the moisture 0.85wt%, continue to heat up to 115°C, drop the second After the addition of 605 g of propylene oxide in the second stage, react under internal pressure at the reaction temperature for 3 hours, pull a vacuum to remove unreacted monomers, cool down and d...

Embodiment 3

[0043] Add 520g liquid sorbitol (purity 70wt%) and 6g potassium hydroxide (based on the total weight of liquid sorbitol and all epoxides, consumption is 0.39wt%) in 2L stainless steel reactor (distributor is equipped with at the bottom of the still) , carry out nitrogen replacement, after the oxygen content in the test kettle is less than 150ppm, heat up, and at 85°C, gradually add 460g of the first stage of propylene oxide dropwise (based on the total weight of liquid sorbitol and all epoxides, the dosage is 30.3 wt%), after the dropwise addition, react under internal pressure at the reaction temperature for 3 hours, then heat up to 90°C, adopt nitrogen to carry out bubbling dehydration for 4 hours, sample and analyze moisture 1.5wt%, continue to heat up to 115°C, drop the second After the addition of 540 g of propylene oxide in the second stage, react under internal pressure at the reaction temperature for 3 hours, pull a vacuum to remove unreacted monomers, cool down and dis...

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Abstract

The invention relates to a preparation method of sorbitol-based polyether polyol. The method mainly solves the problems of high hydroxyl value, low viscosity and dark color of the product in an existing method using liquid sorbitol as an initiator, and comprises the following steps: S1, carrying out polymerization reaction on the liquid sorbitol, a catalyst and part of epoxide, and carrying out dehydration treatment on the obtained product to obtain a first intermediate product with the water content of less than or equal to 2wt%; S2, carrying out polymerization reaction on the first intermediate product and the residual epoxide to obtain crude sorbitol-based polyether polyol; and S3, carrying out refining treatment on the crude sorbitol-based polyether polyol to obtain a sorbitol-based polyether polyol finished product. In the step S1, the temperature of the polymerization reaction is 60-110 DEG C, and the temperature of the dehydration treatment is 70-100 DEG C. The method disclosed by the invention not only has higher economic value, but also is accurate in feeding amount, stable in preparation process and stable in product quality, and can be applied to the field of polyurethane foam.

Description

technical field [0001] The invention belongs to the technical field of preparation of polyether polyols, in particular to a method for preparing sorbitol-based polyether polyols, and more specifically to a method for preparing sorbitol-based polyether polyols with liquid sorbitol as a starting agent . Background technique [0002] In the broad category of general-purpose polyether polyols, it has been reported that ethylene glycol, propylene glycol, glycerol, hexanetriol, pentaerythritol, xylitol, and sucrose are used as initiators to polymerize polyethers with epoxides. Polyether products can be used in soft, semi-soft and rigid foams for various purposes. [0003] Sorbitol is a high-functionality initiator, and foams prepared from sorbitol polyether are better than glycerol polyether and xylose in terms of aging performance, dimensional stability, mechanical properties, softening temperature and oil resistance. Products based on alcohol polyether and sucrose polyether ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2696C08G65/2648
Inventor 朱建海胡丽云杨正勇夏军陈颂义
Owner CHINA PETROLEUM & CHEM CORP