Refining method of low-odor and high-activity polyether polyol

Abstract

The invention relates to a refining method of low-odor and high-activity polyether polyol, and belongs to the technical field of polyether polyol. The refining method comprises the following steps of adding high-activity crude polyether polyol into a refining treatment kettle, and adding water to stir; under the condition of nitrogen pressure filling, adding a refining adsorbent A to stir, then adding a refining adsorbent B to stir, dewatering, drying and filtering, so as to obtain the low-odor and high-activity polyether polyol. Compared with the traditional refining technology of using phosphoric acid and water and adding one or two types of common adsorbent, the refining method has the advantages that the high-activity crude polyester is refined under the matching action of acid magnesium silicate, synthetic magnesium silicate and water, so that the alkaline metal ion can be removed like the conventional technology, and the polyester index and parameter meet the national standard; the two types of refining adsorbents are slightly weak acid, so that the new aldehyde and other impurities are not produced in the refining phase, the content of aldehyde matters is reduced, and the product odor is decreased.

Description

technical field [0001] The invention relates to a method for refining polyether polyols with low odor and high activity, and belongs to the technical field of polyether polyols. Background technique [0002] Polyether polyol (referred to as polyether) is one of the main raw materials for the synthesis of polyurethane resin, and highly reactive polyether polyol is one of the most widely used types of polyether polyol, it has the characteristics of high reactivity, and the prepared The product has excellent performance and comfortable body feeling, so it is more and more used in articles that come into contact with the human body, such as mattresses, neck pillows, etc. At present, in addition to the performance requirements of the product, the requirements for its smell are also getting higher and higher. Highly active polyether polyols generally use glycerin as the starting agent, under the action of an alkali metal catalyst, with epoxide (propylene oxide, ethylene oxide or ...

AI Technical Summary

Problems solved by technology

In order to remove the alkali metal catalyst in the refining process, phosphoric acid and water are used to neutralize the salt, and then the alkali metal ions are removed with an adsorbent, but side reactions are likely to occur in an acidic environment, resulting in aldehydes (formaldehyde, acetaldehyde, Acrolein, etc.), ketones, allyl alcohol and other substances, which will bring a strong odor to the final product during product use

Although some companies have tried some methods to remove polyether odor, the effect is not obvious: such as strict requirements on raw material indicators, which will increase procurement costs; strictly control the lower reaction temperature in the polymerization reaction to reduce by-products This will prolong the reaction cycle and affect the effect of the polymerization reaction; multiple treatments with water and adsorbents during post-treatment can remove part of the odor, but the water consumption is large, the production cycle is prolonged, and the production efficiency is reduced; Or use various volatile additives to take away the odor, but these additives will remain in the polyether and affect the use effect of the polyether

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