Method for preparing uvioresistant polyester by nanometer titania generated in situ

A technology of nano-titanium dioxide and nano-titanium oxide, which is applied in rayon manufacturing, fiber chemical characteristics, textiles and papermaking, etc., can solve problems such as agglomeration and uneven dispersion, low material strength, poor fiber spinnability and mechanical properties, etc. Achieve the effect of reducing catalytic activity and improving hue

Inactive Publication Date: 2004-12-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention completely solves the problems of agglomeration and uneven dispersion of the ultraviolet absorber in the polymer, low strength of the material, poor temperature resistance, and the poor spinnability and mechanical properties of the fiber prepared by the blending melt s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a reactor equipped with a stirrer and a distillation device, add 100ml of ethylene glycol, and carry out vigorous stirring and ice-water bath cooling; in a protective atmosphere N 2 Slowly add 10ml of titanium tetrachloride, stir for 30 minutes, remove the cooling device, and slowly pass in dry ammonia gas through the separatory funnel. When the solution is neutral, keep stirring for 20 minutes, and let it cool down to At room temperature, filter to obtain a liquid that is easily hydrolyzed; then move it into a decompression device, distill at a vacuum of 1000 Pa and a temperature of 80 ° C, after 15 minutes, a large amount of white precipitate is formed, stand to cool to room temperature, filter, and use acetone Wash the filtrate and dry to obtain the titanium glycolate solid.

[0019] Add 1470 grams of ethylene glycol into a 2000mL beaker, add 30 grams of polyvinylpyrrolidone while stirring, and heat to 70°C. After stirring and reacting for 1 hour, set aside.

[...

Embodiment 2

[0024] The modified ethylene glycolate is dispersed in ethylene glycol according to the method described in Example 1, the difference is that the solid content of the slurry is 15%, and the selected organic modifier is polyethylene glycol, poly The consumption of ethylene glycol is 8.5 grams (6% by generating nano titanium oxide meter).

[0025] 8000g of terephthalic acid, 2330g of ethylene glycol and 1960 grams of the above-mentioned ethylene glycol salt / ethylene glycol slurry of titanium are beaten together and then added to a 30-liter polyester polymerization kettle. Antimony ethylene glycol is used as a polycondensation catalyst and phosphoric acid tris Methyl ester is a polymerization stabilizer for polymerization. Esterification is carried out under normal pressure, and the pressure in the kettle in the final stage of polycondensation should be kept below 80Pa. After maintaining a high vacuum for 185 minutes, the material was discharged to obtain a nano-titanium oxide / p...

Embodiment 3

[0029] The modified ethylene glycolate is dispersed in ethylene glycol according to the method described in Example 1, the difference is that the solid content of the slurry is 22.5%, and the organic modifier is silane coupling agent KH560, KH560 The dosage is 0.56 grams (2% based on the calculation of generating nano-titanium oxide).

[0030] 8000g of terephthalic acid, 3800g of ethylene glycol and 260g of the above-mentioned ethylene glycol salt / ethylene glycol slurry of titanium are beaten together and then added to a 30-liter polyester polymerization kettle, using ethylene glycol antimony as a polycondensation catalyst, phosphoric acid Trimethyl ester is a polymerization stabilizer for polymerization reaction. Esterification is carried out under normal pressure, and the pressure in the kettle in the final stage of polycondensation should be kept below 80Pa. After maintaining a high vacuum for 230 minutes, the material was discharged to obtain a nano-titanium oxide / polyest...

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Abstract

A process for in-situ preparing UV-resistant polyester by use of TiO2 nanoparticles includes such steps as synthesizing the hydrolysis speed controllable glycol salt of Ti, organic stabilizing it, dispersing it in diol, and polymerizing (or copolymerizing) with polyester and other monomers. Its advantage is high UV shielding effect.

Description

technical field [0001] The invention relates to a method for preparing polyester, in particular to a method for preparing anti-ultraviolet polyester by generating nanometer titanium dioxide in situ. It belongs to the field of composite materials. technical background [0002] In recent years, due to factors such as intensified destruction of forest vegetation, frequent sunspot activities, and extensive use of freon refrigerants, human beings are facing increasing ultraviolet radiation. Ultraviolet rays are divided into UVC (200-280nm), UVB (280-320nm), UVA (320 ~ 400nm) three regions. UVC is absorbed by the ozone layer, does not reach the ground, and has basically no damage to the human body. UVB can be absorbed by the dermis of the skin, and long-term exposure will cause erythema, inflammation, skin aging, and in severe cases, it will cause skin cancer. The penetration of UVA is much deeper than that of UVB, which can make the skin dark, and long-term accumulation will l...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08K3/22C08L67/00
CPCD01F1/106
Inventor 徐宏程存康林嵩古宏晨吴亚妮
Owner SHANGHAI JIAO TONG UNIV
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