Alkylene oxide-tetrahydrofuran copolymer and preparation method thereof

Abstract

The invention relates to an alkylene oxide-tetrahydrofuran copolymer and a preparation method thereof. The alkylene oxide-tetrahydrofuran copolymer is prepared from tetrahydrofuran, a supported solid acid catalyst, an initiator, ethylene oxide and / or propylene oxide; the supported solid acid catalyst is prepared by taking dodecaphosphotungstic heteropoly acid as a matrix, and carrying out Zn < 2 + > modification and synthesis by adopting a sol-gel method. By adopting the supported solid acid catalyst, the reaction of the initiator, tetrahydrofuran, ethylene oxide and propylene oxide can be realized under mild conditions, and the catalyst has high reaction activity and selectivity, so that the content of by-products of the synthesized alkylene oxide-tetrahydrofuran copolymer product is reduced, the distribution coefficient is narrowed, the distribution coefficient R of the alkylene oxide-tetrahydrofuran copolymer product can be controlled to be 1.1-1.8, no solvent needs to be added in the technological process, the reaction steps can be greatly reduced, and the industrialization cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of fine chemical synthesis, and specifically relates to an alkylene oxide-tetrahydrofuran copolymer and a preparation method thereof. Background technique [0002] Ethylene oxide-propylene oxide-tetrahydrofuran copolymer, the main chain is composed of methylene (-CH 2 -) and ether bond (-O-), because this structure destroys the regularity of the polymer chain structure, it is not easy to crystallize, and has good flexibility, low temperature performance, strong adhesion, good mechanical properties, etc. , is a new generation of binder for NEPE solid rocket propellants. In addition to this, ethylene oxide-propylene oxide-tetrahydrofuran copolymers can be used in other plastic materials such as polyurethane, as well as raw materials for lubricants and fuel additives. [0003] However, the applicant found that solid acid, boron trifluoride, trifluoromethanesulfonic acid, montmorillonite clay, etc. are commonl...

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Problems solved by technology

[0004] Chinese patent CN101942084A describes a method for catalyzing the synthesis of polytetrahydrofuran with a rare earth metal trifluoromethanesulfonate compound. The rare earth metal trifluoromethanesulfonate compound is used as a catalyst. The finished product of the catalyst is relatively high, and a solvent is used to separate the catalyst, increasing The complexity of the reaction process

However, the applicant found that the existing solid acid catalysts on the market are highly toxic and corrosive, and are difficult to remove from processed products, and also have the disadvantages of poor reactivity and selectivity. Moreover, the production and processing of these solid acid catalysts are relatively complicated, and the requirements for production and processing equipment are high, resulting in high production costs, which are difficult to reduce

For example: phosphotungstic acid (H 3 PW 12 o 40 ·nH 2 O, HPW) is a solid oxygen-containing heteropolyacid with Keggin structure, which has strong acidity, high catalytic activity and stability, and is widely used in olefin hydration, dehydration, esterification, alkylation and epoxidation, etc. During the reaction; however, the phosphotungstic acid catalyst has a small specific surface area and is easily soluble in polar solvents such as water and alcohol, making it difficult to separate from the reaction system

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