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Method for preparing environment-friendly polyester

An environmentally friendly polyester technology, applied in the field of polymer materials, can solve the problems of affecting the cleanliness of polyester, prolonging the polymerization time, and many side reactions

Active Publication Date: 2019-03-26
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the yellowing problem of titanium-based polyesters, patent CN102127215A discloses a polymerization method for polyester resins. The titanium compound used is an organic chelated titanium complex. Although the magnesium compound and phosphate esters added in the polymerization process can Improve the hue of polyester, but the polymerization time will be prolonged accordingly, resulting in more side reactions of polyester and lower quality
Patent CN101104678A adds titanium catalyst, phosphorus heat stabilizer, and toner to improve the hue of titanium-based polyester, but the addition of stabilizer will prolong the reaction time, and the addition of toner will affect the cleanliness of polyester
Patent CN103554452A prepares polyester for environmentally friendly membranes, but the b value is above 3.0, and the reaction time is equivalent to that of antimony catalysts. There may be many side reactions in the polycondensation process, which may have a certain impact on subsequent use

Method used

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  • Method for preparing environment-friendly polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Titanium nitride powder and ethylene glycol were pre-dispersed and ground to prepare a suspension containing 15% titanium nitride concentration for use, and the median particle size of the nano-titanium nitride used was 30nm.

[0020] Add 5000g of terephthalic acid, 1960g of ethylene glycol, 1.05:1 molar ratio of ethylene glycol to PTA, 0.172g of tetraisopropyl titanate catalyst, 3.86g of the above-mentioned titanium nitride / ethylene glycol in a 20L general-purpose polymerization reactor. The alcohol suspension is subjected to esterification reaction at 245°C and an absolute pressure of 0.35Mpa. When the water output reaches 1100ml, the pressure is released to normal pressure. The polycondensation reaction was carried out for 61 minutes at an internal temperature of 280° C. and an absolute pressure of 70 Pa. After the reaction was completed, 5,783 g of environmentally friendly polyester were obtained through extrusion by a melt pump, pelletizing, and drying. The conten...

Embodiment 2

[0022] Titanium nitride powder and ethylene glycol were pre-dispersed and ground to prepare a suspension containing 15% titanium nitride concentration for use, and the median particle size of the nano-titanium nitride used was 30nm.

[0023] Add 5000g of terephthalic acid, 2241g of ethylene glycol, 1.20:1 molar ratio of ethylene glycol to PTA, 0.100g of tetraisopropyl titanate catalyst, 1.93g of the above-mentioned titanium nitride / ethylene glycol in a 20L general-purpose polymerization reactor. The alcohol suspension is subjected to esterification reaction at 225°C and an absolute pressure of 0.30Mpa, and when the water output reaches 1100ml, the pressure is released to normal pressure. The polycondensation reaction was carried out for 93 minutes at an internal temperature of 275° C. and an absolute pressure of 30 Pa. After the reaction was completed, 5,783 g of environmentally friendly polyester were obtained through extrusion by a melt pump, pelletizing, and drying. The co...

Embodiment 3

[0025] Titanium nitride powder and ethylene glycol were pre-dispersed and ground to prepare a suspension containing 15% titanium nitride concentration for use, and the median particle size of the nano-titanium nitride used was 30nm.

[0026] Add 5000g of terephthalic acid, 2614g of ethylene glycol, 1.40:1 molar ratio of ethylene glycol to PTA, 0.076g of tetraisopropyl titanate catalyst, 3.86g of the above-mentioned titanium nitride / ethylene glycol in a 20L general-purpose polymerization reactor. The alcohol suspension is subjected to esterification reaction at 265°C and an absolute pressure of 0.25Mpa. When the water output reaches 1100ml, the pressure is released to normal pressure. The polycondensation reaction was carried out for 86 minutes at an internal temperature of 285° C. and an absolute pressure of 90 Pa. After the reaction was completed, 5,783 g of environmentally friendly polyester were obtained through extrusion by a melt pump, pelletizing, and drying. The conten...

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Abstract

The invention relates to a method for preparing environment-friendly polyester, and belongs to the field of polymer materials. The method adopts dicarboxylic acid and dihydric alcohol as raw materials, titanate as a catalyst and nano-titanium nitride as an additive, and comprises the following steps: performing esterification; performing polycondensation; extruding, granulating and drying througha melt pump to obtain the environment-friendly polyester. In the polymerizing process, titanium nitride has the effect of a co-catalyst, the polycondensation can be improved by over 20 percent. The bvalue of the novel modified polyester is reduced by 6 unit and more in comparison with that of conventional titanium series polyester.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of environment-friendly polyester. Background technique [0002] At present, the catalysts for PET synthesis are mainly antimony-based catalysts such as ethylene glycol antimony, antimony acetate, and antimony trioxide. The antimony-based catalysts are generally active, so they are used in large amounts. The requirements for medium and heavy metal content are becoming more and more stringent. Titanium-based catalysts have high catalytic activity, low dosage, and the prepared polyester has high transparency. They have been used at home and abroad, and are considered to be the most likely products to replace antimony-based catalysts. However, titanium-based catalysts have high catalytic activity for polycondensation side reactions. , so the color yellowing of the prepared polyester is serious, which seriously restricts the application of titanium-b...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/85C08K3/28
CPCC08G63/183C08G63/85C08K3/28C08K2201/003C08K2201/011
Inventor 王树霞戴钧明司虎王玉合王坤
Owner SINOPEC YIZHENG CHEM FIBER
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