A kind of preparation method of polycarbonate synthesis double metal cyanide catalyst

Abstract

The invention discloses a preparation method for a double metal cyanide catalyst for polycarbonate synthesis. The preparation method comprises the following steps of: firstly dissolving soluble metallic salt in organic ligand, and then adding deionized water to serve as a solution 1; dissolving water-soluble metallic cyanide salt in the deionized water to serve as a solution 2, wherein the volume ratio of the solution 1 to the solution 2 is 0.1: 1-5: 1; and then dripping the solution 2 to the solution 1 to obtain a solid catalyst after stirring and drying. In the invention, the influence of the deionized water to the synergic action between the organic ligand and the soluble metal salt is avoided; the synergic action between the organic ligand and the soluble metal salt in the DMC (Di Methyl Carbonate) catalyst is exerted at the greatest degree; and the reaction time when the catalyst catalyzes a copolymerization of propylene oxide and CO2 does not exceed 8h, the activity reaches to above 30Kg polymer / g catalyst, and the CO2 unit content in the polymer reaches up to 45.0%.

Description

technical field [0001] The invention belongs to a preparation method of a double metal catalyst, in particular to a preparation method and application of a double metal cyanide catalyst for polycarbonate synthesis. Background technique [0002] CO since the industrial revolution 2 The sharp increase in emissions has led to a series of environmental problems. A low-carbon economy not only requires us to reduce CO 2 emissions, and how to effectively use cheap and low-toxic CO 2 It has also become a research hotspot. Using CO 2 Copolymerize with epoxy to form aliphatic polycarbonate, which is CO 2 Utilizing one of the most valuable and promising directions in research, aliphatic polycarbonate has been used in new polyurethane materials, biomedical materials, gas barrier materials, tougheners for brittle materials, reinforcing agents for rubber materials, and new liquid crystals. Materials, unsaturated polyesters, adhesives, photoresists, solid electrolytes and electronic d...

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Problems solved by technology

[0009] The purpose of the present invention is for low activity, long reaction time, CO 2 Defects such as low unit content provide a method for preparing a double metal cyanide catalyst for polycarbonate synthesis. The double metal catalyst prepared by this method can catalyze CO with high activity. 2 Copolymerized with epoxide, the activity reached more than 30kg polymer / g catalyst within 4 hours of reaction, and the CO in the obtained polycarbonate 2 The content of the unit reaches about 0.45 (the CO in the completely alternating copolycarbonate 2 The content of the unit is 0.5)

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