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Polyether polyol as well as preparation method and application thereof

A technology of polyether polyol and diol, applied in the field of polyether polyol, can solve the problems of affecting product yield and post-processing difficulty, restricting applicability and product performance, affecting product quality, etc. Adjustable, good compatibility, good heat resistance effect

Pending Publication Date: 2022-04-12
WANHUA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the process of dehydration of dihydric alcohols, various problems will be encountered affecting product quality
Among them, the more important is the side reaction of monomer dehydration and cyclization, which seriously affects the product yield and the difficulty of post-processing.
Patent CN1774462A mentions the use of acid-base catalysts to prepare polyether polyols with 1,3-propanediol as a monomer, but it does not involve diols that are easy to form rings, such as ethylene glycol, diethylene glycol, etc. Commonly used monomers greatly limit the applicability of this route and the performance of the product

Method used

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  • Polyether polyol as well as preparation method and application thereof
  • Polyether polyol as well as preparation method and application thereof
  • Polyether polyol as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Pressurized etherification reaction:

[0050] 1379.3 g (13 mol) of diethylene glycol, 13.8 g (1 wt % of diethylene glycol) with the structure of the following formula II catalyst were added to the tank reactor at 60 ° C, and nitrogen was charged to 0.2 MPa. After the temperature was raised to 160°C at a rate of / min, the pressure was adjusted to 2.5MPa, and the reaction was continued for 5h at this temperature and pressure.

[0051]

[0052]

[0053] 2) Decompression dehydration:

[0054] Cool the reaction product of step 1) to 90°C, then reduce the pressure to 1kPa within 1h, and maintain this pressure for 4h to remove small molecule by-product water and unreacted monomeric diol;

[0055] 3) Pressurized etherification reaction:

[0056] The product obtained in the step 2) was heated to 210° C. under normal pressure, and 0.14 g of isopropyl titanate (100 ppm of diethylene glycol) was added for further reaction for 2 h.

[0057] 4) Decatalyst treatment:

[0...

Embodiment 2

[0063] 1) Pressurized etherification reaction:

[0064] 1354.0 g (13 mol) of 1,5-pentanediol and 1.4 g (0.1 wt % of 1,5-pentanediol) of the catalyst with the following structure were added to the tank reactor at 80°C, and nitrogen was charged to 0.25 MPa, the temperature was raised to 140°C at a rate of 1°C / min, and the pressure was adjusted to 2.9MPa, and the reaction was continued for 8h at this temperature and pressure.

[0065]

[0066] 2) Decompression dehydration:

[0067] Cool the reaction product of step 1) to 80°C, then reduce the pressure to 0.2kPa within 1h, and maintain this pressure for 3h to remove small molecule by-product water and unreacted monomeric diol;

[0068] 3) Pressurized etherification reaction:

[0069] The product obtained in the step 2) was heated to 200° C. under normal pressure, and 0.04 g of isopropyl titanate (29 ppm of 1,5-pentanediol) was added to further react for 4 h.

[0070] 4) Decatalyst treatment:

[0071] The product obtained in...

Embodiment 3

[0076] 1) Pressurized etherification reaction:

[0077] 1900.6 g (13 mol) of 1,8-octanediol and 0.6 g (0.03 wt % of 1,8-octanediol) of the catalyst with the following structure were added to the tank reactor at 20°C, and nitrogen was charged to 0.3 MPa, the temperature was raised to 120°C at a rate of 3°C / min, and the pressure was adjusted to 2.0 MPa, and the reaction was continued for 7 hours at this temperature and pressure.

[0078]

[0079] 2) Decompression dehydration:

[0080] Cool the reaction product of step 1) to 70°C, then reduce the pressure to 0.02kPa within 1h, and maintain this pressure for 2h to remove small molecule by-product water and unreacted monomeric diol;

[0081] 3) Pressurized etherification reaction:

[0082] The product obtained in the step 2) was heated to 180° C. under normal pressure, and 0.10 g of n-butyl titanate (55 ppm of 1,8-octanediol) was added for further reaction for 4 h.

[0083] 4) Decatalyst treatment:

[0084] The product obtai...

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Abstract

The invention discloses polyether polyol as well as a preparation method and application thereof.The polyether polyol with the structural general formula shown in the formula (1) is prepared by introducing dihydric alcohol and carrying out pressurized etherification reaction, decompression dehydration, pressurized etherification reaction, catalyst removal treatment and refining, and the polyether polyol has the advantages of being good in heat resistance, low in viscosity and adjustable in structural height. The polyurethane elastomer is used for polyurethane elastomers, adhesives, coatings and foaming materials, and is favorable for reducing the operation cost and expanding the terminal application field. H-(O-R-) n-OH (Formula I).

Description

Technical field [0001] The invention belongs to the technical field of polyether polyols, and specifically relates to a polyether polyol with a new synthesis route, a preparation method and its application. Background technique [0002] Polyether polyol is a product with excellent comprehensive properties and an important raw material for synthetic polyurethane materials. It is widely used in polyurethane foam, elastomers, adhesives, coatings and other fields. [0003] Polyether polyols are usually prepared by using polyols as initiators to initiate ring-opening polymerization of monomers such as ethylene oxide and propylene oxide. Limited to monomer types, the structure of polyether polyols is relatively simple, which often makes it difficult to fully meet performance requirements in some high-end applications. [0004] In order to break this limitation, many workers are committed to developing new monomers and new synthesis methods. Among the many synthesis routes, the p...

Claims

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Application Information

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IPC IPC(8): C08G65/34C08G18/48C08L75/08C09D175/08C09J175/08
Inventor 李旭峰秦承群黎源
Owner WANHUA CHEM GRP
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