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Preparation method of polyether polyol with low aldehyde content

A polyether polyol and polyether technology, which is applied in the field of preparation of low aldehyde content polyether polyol, can solve the problems of shortening the production cycle, equipment corrosion, salt quality decline, etc., so as to solve the salt scaling and reduce the polyether content. Effect

Pending Publication Date: 2022-01-21
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the adsorption filtration process, the patent CN108341942B discloses a method for refining polyether polyols. This process uses a coalescer to directly separate polyether and brine, avoiding the use of adsorbents, effectively shortening the production cycle and reducing hazardous solids. waste generation, but the aldehyde content of the product prepared in this patent embodiment is still 5ppm, which still cannot meet the use requirements for the high-end polyurethane field
The brine separated by the coalescence production process is dehydrated to realize the separation of salt and water, so as to achieve the purpose of salt recovery takeaway and water recovery and reuse. However, the brine separated by the coalescence process contains a certain amount of polyether. The resulting salt has a large amount of fouling, causing equipment corrosion and adverse effects of salt quality decline

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  • Preparation method of polyether polyol with low aldehyde content
  • Preparation method of polyether polyol with low aldehyde content
  • Preparation method of polyether polyol with low aldehyde content

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preparation example Construction

[0050] The preparation method and reaction conditions of allyl alcohol polyether 2 and allyl alcohol polyether 3 are the same as allyl alcohol polyether 1, the difference is that the feeding ratio is different, allyl alcohol polyether 2 and allyl alcohol polyether 3 The feeding amount refers to the following table:

[0051] Table 1

[0052] Allyl alcohol (g) Sodium metal (g) Propylene oxide (g) Ethylene oxide (g) Phosphoric acid (g) water (g) Allyl alcohol polyether 2 300 10 4200 2503 50.2 300 Allyl alcohol polyether 3 300 10 6000 2276 50.2 300

Embodiment 1

[0055] Synthesis of amine-containing polyether quaternary ammonium salt auxiliary agent a: 93.5g allylamine hydrochloride, 135.6g trimethylallyl ammonium chloride, 52.5g allyl alcohol polyether 1 (a=8, b=12, Mn=1050) was dissolved in 657g of desalted water to form a 30wt% aqueous monomer solution, and 6.80g of 2,2'-azobisisobutylamidine dihydrochloride (AIBA) was added to the aqueous monomer solution. Under the condition of stirring at 200rpm, raise the temperature to 100°C, maintain 100°C and continue the reaction for 2 hours, control the vacuum degree to -0.098MPaG, remove the moisture in the reaction solution at a temperature of 100°C, put the product into a dialysis bag for dialysis purification, and control the vacuum degree to -0.098 MPaG, temperature 100°C to remove the moisture in the purified product, and obtain the amino group-containing polyether quaternary ammonium salt additive a (gel permeation chromatography test number average molecular weight is 5500, PDI is 1....

Embodiment 2

[0057] Synthesis of amine-containing polyether quaternary ammonium salt auxiliary agent b: 46.75g allylamine hydrochloride, 135.5g trimethylallyl ammonium chloride, 67.7g allyl alcohol polyether 2 (a=14, b=11, Mn=1354) was dissolved in 750g of desalted water to form a 25wt% aqueous monomer solution, and 6.46g of azobisisopropylimidazoline hydrochloride was added to the aqueous monomer solution, and the temperature was raised to 100°C under stirring at 200rpm. Maintain 100°C to continue the reaction for 2 hours, control the vacuum degree to -0.098MPaG, temperature 100°C to remove the moisture in the reaction solution, put the product into a dialysis bag for dialysis purification, control the vacuum degree to -0.098MPaG, temperature 100°C to remove and purify Moisture in the product obtains the polyether quaternary ammonium salt auxiliary agent b (number-average molecular weight is 6263, and PDI is 1.63, nuclear magnetic analysis result: δ1.2-1.4 (CH 2 CH, C-CH 3 ), δ3.3-3.7 (C...

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Abstract

The invention discloses a preparation method of polyether polyol with low aldehyde content. The preparation method is realized by adding an amido-containing polyether quaternary ammonium salt additive into a crude polyether polyol compound. The polyether polyol is a high-quality product which is low in aldehyde content and low in odor and is prepared in a mode of adding the additive, and the additive is an oil-water amphiphilic surfactant, can be dispersed on a polyether water emulsification interface, destroys a polyether water interface layer, promotes separation of polyether and water, effectively reduces the content of polyether in saline water, and the problem of salt scaling during saline water treatment is effectively solved.

Description

technical field [0001] The invention relates to a preparation method of polyether polyol with low aldehyde content, and belongs to the technical field of polyether polyol preparation. Background technique [0002] Polyether polyol is formed by adding initiator (compound containing active hydrogen group) and ethylene oxide (EO), propylene oxide (PO), butylene oxide (BO) in the presence of a basic catalyst. Made by polymerization reaction. Polyether polyol is the main raw material for the production of polyurethane materials. With the rapid development of the polyurethane industry, the requirements for the quality of polyether are getting higher and higher. The refined post-treatment process of polyether polyol directly affects the intrinsic quality of polyether polyol. [0003] At present, the most used refining process is acid neutralization, adsorbent adsorption, dehydration crystallization, and filtration. This process has the problems of many production links, long cycle...

Claims

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Application Information

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IPC IPC(8): C08G65/30C08G65/28C08F283/06C08F226/02
CPCC08G65/30C08G65/2609C08F283/065C08F226/02Y02P20/10
Inventor 石正阳秦承群周昕志陆国太隋美玉张永振
Owner WANHUA CHEM GRP CO LTD
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