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Polyester catalyst and preparation method thereof

A polyester catalyst and silica technology, which is applied in the field of inorganic non-metallic mineral functionalized composite and nano-catalyst and their preparation, can solve the problems of complex preparation process, complex composition, reduced reaction speed and the like, and achieves simple preparation method, The effect of shortening the molding cycle and increasing the crystallization rate

Active Publication Date: 2015-02-04
常州纳欧新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of titanium oxide nanoparticles is easy to agglomerate, and it is difficult to disperse uniformly in the polyester catalyst system, which increases the complexity of mass transfer, reduces the reaction speed, increases side reactions, and causes the color of the product to turn yellow easily.
In addition, there is a problem of particle agglomeration in the use of oxide-based catalysts, resulting in a decrease in the specific surface area of ​​the catalyst, an increase in the amount of use, and an increase in the cost of use
The third-generation titanium-based catalysts are titanium complex catalysts. The composition of this type of catalyst is relatively complex, and most titanium complex catalysts cannot be miscible with ethylene glycol due to the introduction of ligands with complex structures. The heterogeneity is strong, so the current use effect is still not ideal
In addition, the preparation process of this type of catalyst is relatively complicated, and there are many ingredients used in the raw materials. In particular, many toxic solvents such as benzene and toluene will be introduced in the preparation process of many such catalysts, which makes the preparation process not environmentally friendly.
Due to its complex production process, the production cost of this type of catalyst is relatively high, and it has a relatively large impact on the production cost of polyester.

Method used

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  • Polyester catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Add 1.0 kg of metatitanic acid and 2.7 kg of attapulgite to 74.0 kg of hydrochloric acid solution with a hydrogen ion content of 0.2 mol / L, and react at 40°C for 24 hours to obtain a colloidal mixture;

[0022] 2. Raise the temperature of the colloid mixture obtained in step 1 to 70°C, add 25% sodium silicate aqueous solution to the colloid mixture while stirring until the pH of the system is 9, stop adding the sodium silicate aqueous solution , keep stirring for 3 hours, add 0.1 mol / liter of aluminum chloride solution until the pH value of the system is 7, keep stirring for 0.5 hours, filter, wash, dry and pulverize to obtain attapulgite-Ti-Si-Al quaternary composite catalyst.

Embodiment 2

[0024] 1. Add 2.0 kg of metatitanic acid and 1.09 kg of attapulgite to 12.36 kg of nitric acid solution with a hydrogen ion content of 1 mol / L, and react at 10°C for 96 hours to obtain a colloidal mixture;

[0025] 2. Raise the temperature of the colloid mixture obtained in step 1 to 95°C, add 10% potassium silicate aqueous solution to the colloid mixture while stirring until the pH value of the system is 10, stop adding potassium silicate aqueous solution , keep stirring for 0.5 hours, add 0.5 mol / liter of aluminum nitrate solution until the pH value of the system is 5, keep stirring for 1 hour, filter, wash, dry and pulverize to obtain attapulgite-Ti-Si-Al quaternary composite catalyst.

Embodiment 3

[0027] 1. Add 1.5 kg of metatitanic acid and 1.36 kg of attapulgite to 19.1 kg of hydrochloric acid solution with a hydrogen ion content of 0.6 mol / L, and react at 25°C for 60 hours to obtain a colloidal mixture.

[0028] 2. Raise the temperature of the colloid mixture obtained in step 1 to 82°C, add 20% sodium silicate aqueous solution to the colloid mixture while stirring until the pH of the system is 9.5, stop adding the sodium silicate aqueous solution , keep stirring for 2 hours, add 0.3 mol / liter aluminum sulfate solution until the pH value of the system is 6, keep stirring for 0.8 hours, filter, wash, dry and pulverize to obtain attapulgite-Ti-Si-Al quaternary composite catalyst.

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Abstract

The invention relates to a polyester catalyst and a preparation method thereof. Firstly, attapulgite clay and metatitanic acid are added in an acid solution to prepare a colloidal mixed solution; then a silicate water solution and an aluminium salt solution are added in the colloidal mixed solution; and an attapulgite clay-based titanium polyester catalyst is obtained by fully stirring, filtering, washing, drying and crushing. The catalyst is simple in preparation method and can not cause environment pollution. In a polyester reaction system, activity of the catalyst is increased and color of a product can be improved.

Description

technical field [0001] The invention belongs to the field of polyester catalyst preparation, and in particular relates to an inorganic non-metallic mineral functional composite and nanometer catalyst and a preparation method thereof. Background technique [0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids. It mainly refers to thermoplastic resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyarylate. It is an important class of synthetic fiber raw materials and thermoplastic engineering plastics. Among them, PET has excellent heat resistance, insulation, resilience, wear resistance, and impact resistance, so it is widely used in the fields of fibers, films, packaging materials, electronic appliances, medical and health care, and engineering plastics. At present, 90% of the world's PET production uses antimony-based catalysts with antimony trioxide, antimony acetate and antimony glycol a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85
Inventor 姚超陈群徐斌海吴凤芹丁运生左士祥李峰
Owner 常州纳欧新材料科技有限公司