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A kind of preparation method and application of green titanium series polyester catalyst

A technology of titanium-based catalysts and titanium-based polyesters, applied in the field of preparation of green titanium-based catalysts, can solve problems such as easy yellowing of product hue, high hue b value, and poor thermal stability, so as to improve catalytic effect and solve hue problems , The effect of catalyst stabilization

Active Publication Date: 2021-06-29
常州大学盱眙凹土研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional antimony-based catalysts, C-94 has higher catalytic activity and can shorten the polycondensation time by more than 40%, but the hue b value is high, and the product is prone to yellowing
[0007] Compared with traditional antimony-based catalysts, titanium-based catalysts have high catalytic activity, fast reaction rate, non-toxic, cheap and easy to obtain, but there are still many problems. At present, the preparation of titanium oxide active materials has crystal forms, and the obtained products have easy hue Yellowing, poor thermal stability, etc.

Method used

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  • A kind of preparation method and application of green titanium series polyester catalyst
  • A kind of preparation method and application of green titanium series polyester catalyst
  • A kind of preparation method and application of green titanium series polyester catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Place a 500ml three-necked flask in a self-built device equipped with a water bath and a stirrer, weigh 1.5g of ethyl orthosilicate and dissolve it in 20ml of absolute ethanol, add 0.01g of acidified attapulgite (1%), and stir evenly , slowly drip the mixed solution of 2.046g titanium tetraisopropoxide (the molar ratio of titanium and silicon is 1:1) and 20ml absolute ethanol, utilize separating funnel to slowly add deionized water (10ml) and absolute ethanol ( 20ml) of the mixed solution, heated at 20°C in a water bath, hydrolyzed for 4 hours, stopped heating and stirring, washed with absolute ethanol, dried at 60°C, and ground. A new type of green titanium-based catalyst was obtained.

Embodiment 2

[0040]Place a 500ml three-necked flask in a self-built device equipped with a water bath and a stirrer, weigh 1.8g of ethyl orthosilicate and dissolve it in 70ml of absolute ethanol, add 0.96g of acidified attapulgite (13%), and stir evenly , slowly drip the mixed solution of 24.56g titanium tetraisopropoxide (the mol ratio of titanium and silicon is 10:1) and 70ml absolute ethanol, utilize separatory funnel to slowly add deionized water (30ml) and absolute alcohol ( 70ml) of the mixed solution, heated at 45°C in a water bath, hydrolyzed for 14 hours, stopped heating and stirring, washed with absolute ethanol, dried at 60°C, and ground. A new type of green titanium-based catalyst was obtained.

Embodiment 3

[0042] Place the 500ml three-necked flask in a self-built device equipped with a water bath and a stirrer, weigh 2g of ethyl orthosilicate and dissolve it in 120ml of absolute ethanol, add 3.4025g of acidified attapulgite (25%), and stir evenly. Slowly add a mixed solution of 49.11g of titanium tetraisopropoxide (the molar ratio of titanium to silicon is 20:1) and 120ml of absolute ethanol, and slowly add deionized water (50ml) and absolute ethanol (120ml ) mixed solution, heated in a water bath at 70°C, hydrolyzed for 24 hours, stopped heating and stirring, washed with absolute ethanol, dried at 60°C, and ground. A new type of green titanium-based catalyst was obtained.

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Abstract

The invention relates to a preparation method and application of a green titanium-based polyester catalyst, which is characterized in that it comprises the following steps: dissolving ethyl orthosilicate in absolute ethanol, adding an appropriate amount of acidified attapulgite, stirring evenly, and continuing to drip Add a mixed solution of titanium tetraisopropoxide and absolute ethanol, add dropwise a mixed solution of deionized water and absolute ethanol, heat in a water bath, hydrolyze for several hours, stop heating and stirring, wash with absolute ethanol, dry and grind to obtain It is a new type of green titanium-based catalyst. The advantage of the present invention is that the titanium oxide / silicon oxide / attapulgite composite titanium-based catalyst is prepared by the mixed hydrolysis method, and silicon oxide is used to suppress the crystallization of titanium oxide, and at the same time, the attapulgite is used as a carrier to improve the dispersion of titanium oxide and silicon oxide properties, making the activity of the catalyst more stable, thereby reducing the side reactions of the polyester and improving the hue of the polyester produced.

Description

technical field [0001] The invention belongs to the field of polyester catalysis, and relates to a preparation method and application of a green titanium series catalyst. Background technique [0002] The synthesis process of traditional PET polyester chips usually uses antimony-based catalysts as polyester catalysts, uses terephthalic acid (PTA) and ethylene glycol (EG) as raw materials, and undergoes the first stage of direct esterification. And the second-stage polycondensation reaction (polycondensation), adding antimony-based catalysts (such as antimony trioxide, ethylene glycol antimony or antimony acetate, etc.) Then carry out solid phase thickening to increase the weight. [0003] In recent years, PET polyester has been widely used in daily life, involving industries such as fibers, films, packaging materials and engineering plastics. In the polyester industry, antimony-based polyester catalysts were the first to be used. However, antimony, as a heavy metal element...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85C08G63/183
CPCC08G63/183C08G63/85
Inventor 姚超曹叶皖刘文杰李霞章左士祥严向玉毛辉麾
Owner 常州大学盱眙凹土研发中心
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