Synthesis method of trimethylolpropane polyoxypropylene ether

Abstract

The invention provides a synthesis method of trimethylolpropane polyoxypropylene ether, which is characterized in that trimethylolpropane and epoxypropane are used as raw materials and are subjected to polymerization reaction under the catalysis of a titanium silicalite molecular sieve ETS-10 to prepare the trimethylolpropane polyoxypropylene ether. The relative molecular mass distribution of the finally obtained trimethylolpropane polyether is less than or equal to 1.01, the trimethylolpropane residue is less than or equal to 100ppm, the content of allyl alcohol by-products is less than or equal to 10ppm, and the hydroxyl value is 340-360mgKOH / g. In addition, the titanium silicalite molecular sieve ETS-10 catalyst is economical and easy to obtain, can be repeatedly used, and is simple to separate and low in consumption.

Description

technical field [0001] The invention belongs to the technical field of fine chemical product synthesis, in particular to a method for synthesizing trimethylolpropane polyoxypropylene ether. Background technique [0002] Propoxylated trimethylolpropane is an important UV-curable intermediate, mainly used in the synthesis of acrylate reactive diluents, such as the second-generation reactive diluent propoxylated trimethylolpropane triacrylic acid Ester (PO-TMPTA), compared with the first-generation reactive diluent trimethylolpropane triacrylate (TMPTA), it introduces a flexible chain into the molecule to ensure high activity, high solubility, and shrinkage of cured film. , flexibility and adhesion to the substrate are also improved, while the irritation to human skin is greatly reduced. It is used in various fields, such as chemical coatings, 3D printing, machinery production, automobile manufacturing, healthcare and aerospace, etc. [0003] Propoxylated trimethylolpropane i...

AI Technical Summary

Problems solved by technology

But when preparing low unsaturation polyether polyol, there is the shortcoming that induction period is longer, simultaneously Wang Wenhao (Wang Wenhao. DMC catalyst and the research progress of producing low unsaturation polyether [J]. Polyurethane industry, 2006, 21(3): 6-9) et al. proposed that another shortcoming is that it cannot directly use small molecule active hydrogen as an initiator, but needs to use an alkoxylated oligomer with a relative molecular weight greater than 200 as an initiator

However, KOH is still needed as a catalyst in the process of preparing the starter, which requires post-treatment of the starter to remove the residual basic catalyst, because the basic catalyst will reduce or even inactivate the DMC activity.

This complicates the production process and increases the cost

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