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Method for refining low-odor polyether polyol

A technology of polyether polyol and refining method, which is applied in the direction of preparation of ether, medical preparations of non-active ingredients, pharmaceutical formulas, etc., can solve the problems of substances that cannot be used on a large scale and cannot remove odors, and achieve odor reduction and effective obvious effect

Inactive Publication Date: 2010-07-14
SHANDONG BLUSR DONGDA CHEM
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Problems solved by technology

However, this method imposes strict restrictions on the metering of purified water, the temperature and pressure of the distillation, and the particle size of the water stream, and if the predetermined distillation conditions are not observed, the odor-generating substances cannot be sufficiently removed from the polyether polyol , which makes the method unusable on a large scale

Method used

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  • Method for refining low-odor polyether polyol

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Embodiment 1-4

[0027] In the following examples, 1000g of various crude polyether polyols (as described below) were added to a 3L stainless steel reaction kettle, heated to 70°C, 10g of pure water and 10g of hydrated magnesium silicate were added, and stirred for 30 minutes. Filter through a funnel, re-add the polyether polyol obtained after filtration into the reaction kettle, add 10g of pure water and 10g of diatomaceous earth, stir for 30 minutes, carry out vacuum dehydration for 1 hour, keep the temperature at 105±2°C, and then use a cloth Filter through a funnel to obtain refined polyether polyols.

[0028] The present invention is shown in Table 1 and Table 2 to the removing effect of the impurity in the polyether polyol used. Analysis is performed by chromatographic analysis of the liquid phase gas.

[0029] Polyether polyol 1: Ethylene oxide / propylene oxide polyether prepared from glycerol, which is branched, with an OH value of about 21, a molecular weight of 8000, KOH%=0.3%.

[0...

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Abstract

The invention relates to a method for refining low-odor polyether polyol. The polyether polyol is catalyzed and synthesized by using alkali metal. The method is characterized by comprising the following steps of: adsorbing, crystallizing and filtering for 1-5 times at 60-120 DEG C by using pure water which accounts for 0.1-10 percent of the total mass of rough polyether polyol and two adsorbents to obtain the low-odor polyether polyol, wherein the adsorbents are hydrated magnesium silicate and kieselguhr with the mass proportion of 1;1, and the total adding amount of the adsorbents accounts for 0.1-3 percent of the total mass of the rough polyether polyol. The invention can effectively remove the content of potassium and sodium ions in the polyether polyol, prevents the generation of a by-product generating odor to the greatest extent while effectively removing the potassium and sodium ions in polyether and enables the polyether polyols to hardly have odor, thereby fundamentally reducing the odor of the polyether.

Description

technical field [0001] The invention belongs to a method for refining polyether polyols, in particular to a method for refining polyether polyols with low odor. Background technique [0002] Polyether polyol (referred to as polyether) is the main raw material for the production of polyurethane resin. The synthesis of polyether polyols basically uses small molecule polyols or polyamines as initiators, alkali metal oxides or hydroxides as catalysts (the most commonly used catalyst is potassium hydroxide), propylene oxide or ethylene oxide Alkanes react as polymerized monomers to form macromolecular liquid polymers. The polymerized polyether polyol contains catalyst potassium hydroxide and some potassium alcoholates, unreacted monomers and their oligomers, so the crude polyether needs to be purified to remove these impurities. The removal methods of these impurities are known, and the most used at present is to use adsorbent to carry out adsorption and filtration treatment af...

Claims

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Application Information

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IPC IPC(8): C08G65/30C07C43/11C07C41/36C08G18/48A61K8/86A61K47/34C08G101/00A61K47/10
Inventor 刘小会孔伟李兆星郭辉姜永获马小科孙刚
Owner SHANDONG BLUSR DONGDA CHEM
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