Titanium-silicon catalyst, preparation method and uses thereof

Abstract

The invention discloses a titanium-silicon catalyst and a preparation method as well as an application thereof. The preparation method includes the following steps: (1) organic titanic acid ester and 2 / 3 cubic content of anhydrous alcohol are mixed evenly, and stirred sufficiently to achieve A solution; deionized water is mixed with the remained 1 / 3 cubic content of anhydrous alcohol sufficiently, acid or alkali is added, the acid or alkali concentration is controlled within 0.01-1mol / L, B solution is prepared, and B solution is dripped into A solution by a burette; (2) the mixture is stirred for 3-5 hours after dripping, the precipitate achieved after centrifugal separation is grinded and calcined to achieve titanium-silicon catalyst. The titanium-silicon catalyst achieved by the method is stable during the process of polymerization without hydrolysis reaction; the method can be used to catalytic synthesis of aliphatic and aromatic co-polyester, the titanium-silicon catalyst can reduce the dosage of catalyst, shorten the duration of polymerization, improve the quality of biodegradation co-polyester product, and the terminal carboxyl group content in the product as well as the b value are reduced.

Description

technical field [0001] The invention relates to the technical field of aliphatic aromatic copolyester synthesis, in particular to a titanium silicon catalyst and its preparation method and application. Background technique [0002] The expansion of the application of polymer materials has greatly facilitated people's lives, but the waste after use has also increased rapidly, and most of the currently used polymer materials are stable in nature and difficult to degrade, even with degradable materials such as starch. Natural materials are doped, and only the filling part is degraded. Non-degradable polymer powders are difficult to recycle, causing inevitable environmental pollution, especially in agriculture, packaging and medical industries with short product life cycles. Among the currently researched biodegradable polymers, there is a large category of polyesters, whose main chains are mostly connected by aliphatic structural units through easily hydrolyzed ester bonds. Mi...

AI Technical Summary

Problems solved by technology

[0003] In the preparation process of biodegradable copolyesters, the catalysts traditionally used are organic titanate catalysts, and the water generated in the reaction process will greatly reduce the activity of the catalysts, so the amount of catalysts must be increased, resulting in side effects The reaction increases, the carboxyl group content of the polyester product increases, and the quality decreases

[0004] Aiming at the shortcomings of traditional titanium-based catalysts, various improvement methods have been proposed: one is to compound with other catalysts and introduce toner to improve the hue of polyester products. This method only improves the appearance of the product, but does not improve The inherent quality of the product; the second is to directly select the organic titanate to be hydrolyzed together with other element compounds, the catalyst activity obtained by this method is higher, and the product color is improved; more demanding