Supported bimetallic catalyst for preparing aliphatic polycarbonate diol and preparation method thereof

Abstract

The invention discloses a supported bimetallic catalyst for preparing aliphatic polycarbonate diol. The supported bimetallic catalyst is prepared from an active metal salt and a carrier. The metal salt is a mixture of an alkali metal salt and an alkaline earth metal salt. The content of the metal salt in the catalyst is 10-40 wt%. The carrier is one or more of gamma-Al2O3, ZrO2, SiO2 and TiO2. The mass percentage of the carrier in the catalyst is 60-90%. The invention further discloses a preparation method of the catalyst. The potassium-calcium supported bimetallic catalyst is obtained through the method, the preparation method is simple, catalyst particle uniformity is remarkably improved, the better stability and repeated use performance are achieved, the catalyst is non-toxic and easy to separate, and follow-up product quality is not affected; the catalyst is simple in reaction condition and short in reaction time when used for catalytic preparation of aliphatic polycarbonate diol, the equipment utilization rate is greatly improved, the production cost is lowered, the quality of the synthesized aliphatic polycarbonate diol is good, the product molecular weight and hydroxyl functionality are adjustable, and industrial production is met.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a supported bimetallic catalyst for preparing aliphatic polycarbonate diols through the transesterification of organic dibasic carbonates and aliphatic dibasic alcohols and a preparation method thereof. Background technique [0002] Polycarbonate diol (PCDL) refers to a polymer with hydroxyl groups (-OH) at both ends of the molecule and aliphatic alkylene and carbonate group (-OCOO-) repeating units in the main chain of the molecule. Performance special polyols, aliphatic polycarbonate diols with molecular weights ranging from hundreds to thousands, are considered to be the polyols with the best performance at present, and are important raw materials for the production of a new generation of polycarbonate polyurethanes. Compared with traditional polyols ( Compared with polyurethane (PU) materials synthesized by ordinary polyester, polyether, etc., although polyester...

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Problems solved by technology

Although the carbon dioxide epoxy compound regulated copolymerization method has low raw material cost, the catalyst activity is generally not high at present, and post-treatment is difficult, and only PCDL with specific epoxy compound structure can be synthesized (CN101024685A, CN1060299A)

[0004] Chinese patent CN104801348A reports the use of solid base catalysts to catalyze the transesterification of methanol and ethylene carbonate, but it can only complete the first step of transesterification and cannot achieve polycondensation

U.S. Patent US065360A reported the use of tetraisopropyl titanate to catalyze the transesterification of dimethyl carbonate and glycol to synthesize PCDL, but the yield was low and the catalyst was difficult to separate

Chinese patent CN200710020084.5 reports the use of tetraisopropyl titanate catalyst diethyl carbonate and glycol transesterification to obtain PCDL, and PCDL without catalyst is obtained through post-treatment, but the catalyst is a potential carcinogen in the human body, which is limited industrialized

Chinese patent CN200710061701.6 reports impregnating KF on different supports (γ-Al2O3, ZrO2, SiO2) and applying it to the transesterification reaction of dimethyl carbonate and glycol, the reaction time is long and the activity is poor

The Shanxi Coal Chemistry Institute of the Chinese Academy of Sciences has studied the hydrotalcite compound catalyst (CN101029127) and the supported KF catalyst (CN200710061701.6) in the preparation of PCDL. Both catalysts have the disadvantages of long reaction time and poor activity.

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