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Low-melting-point copolyester and preparation method thereof

A copolyester, low melting point technology, applied in the field of polymers, can solve the problems of polyester thermal properties, poor mechanical properties, impact on practical properties, destruction of crystalline properties, etc. Good results

Active Publication Date: 2020-11-27
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the commercially available low-melting polyesters with a melting point of 110°C, tests have shown that most of them are based on the basic raw materials of terephthalic acid and ethylene glycol. Adding isophthalic acid, aliphatic dibasic acid, diethylene glycol, neopentyl glycol and other acid and alcohol components, although the effect of lowering the melting point is achieved, but the thermal and mechanical properties of polyester become poorer. In particular, its inherent good crystallization properties have been severely damaged, and some are in an amorphous state.
This kind of polyester is easy to bond during the pre-crystallization process, and it is easy to stick to the roll during the spinning process, which seriously affects its practical performance.

Method used

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  • Low-melting-point copolyester and preparation method thereof

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preparation example Construction

[0019] A kind of preparation method of low melting point copolyester, reaction steps are as follows: (1) esterification reaction: mixed acid IPA / PTA, EG and Sb 2 EG 3 Weighing according to the formula (in the mixed acid composed of IPA and PTA, the PTA mass accounts for 80-90%, the molar ratio of EG and the mixed acid is the alkyd ratio 1:1.2-1.5, Sb 2 EG 3 The quality is 300-400ppm based on the mixed acid quality), first pour half of the weighed EG into the 50L polymerization kettle, turn on the stirring and then add the evenly mixed powder IPA, PTA and Sb 2 EG 3 , and then pour the remaining EG, open the kettle to heat, and after beating for 30-40 minutes, use nitrogen to perform three-way and three-release, discharge the air in the kettle, pay attention to keep the pressure in the kettle at 0.2-0.3MPa for esterification, and control the pressure in the kettle. The temperature is between 240°C and 250°C, and the esterification ends when the water output reaches 85% to 95%...

Embodiment 1

[0022] A kind of preparation method of low melting point copolyester, reaction steps are as follows: (1) esterification reaction: take mixed acid IPA / PTA, EG and Sb 2 EG 3 , wherein the mass of PTA in the mixed acid accounts for 90%, the molar ratio of EG to the mixed acid is the alkyd ratio of 1:1.2, Sb 2 EG 3 The mass is 300ppm of the mass of the mixed acid. Pour half of the weighed EG into a 50L polymerization kettle, turn on the stirring and then add the evenly mixed powder IPA, PTA and Sb 2 EG 3 , and then pour the remaining EG, open the kettle to heat, after beating for 30 minutes, use nitrogen to carry out three connections and three releases, discharge the air in the kettle, keep the pressure in the kettle at 0.2-0.3MPa for esterification, and control the temperature in the kettle at 240 ~250°C, after 50 minutes, the water output reaches 90% of the theoretical value, and the esterification is completed;

[0023] (2) polycondensation reaction: in the reaction soluti...

Embodiment 2

[0025] A kind of preparation method of low melting point copolyester, reaction steps are as follows: (1) esterification reaction: take mixed acid IPA / PTA, EG and Sb 2 EG 3 , wherein the mass of PTA in the mixed acid accounts for 80%, the molar ratio of EG to the mixed acid is the alkyd ratio of 1:1.2, and the Sb 2 EG 3 The mass is 350ppm of the mass of the mixed acid. Pour half of the weighed EG into a 50L polymerization kettle, turn on the stirring and then add the evenly mixed powder IPA, PTA and Sb 2 EG 3 , and then pour the remaining EG, open the kettle to heat, after beating for 30 minutes, use nitrogen to carry out three connections and three releases, discharge the air in the kettle, keep the pressure in the kettle at 0.2-0.3MPa for esterification, and control the temperature in the kettle at 240 ~250°C, after 50 minutes, the water output reaches 90% of the theoretical value, and the esterification is completed;

[0026](2) polycondensation reaction: in the reaction...

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Abstract

The present invention relates to the field of polymers. In view of the problem that existing low-melting-point polyester is poor in thermal performance and mechanical performance, the invention provides a low-melting-point copolyester which has the intrinsic viscosity of 0.6-1.0 dL / g and the melting point of 110-150 DEG C, has the characteristics of low melting point, good crystallinity, high intrinsic viscosity and difficulty in bonding, and is suitable for spinning filaments, short fibers and non-woven fabrics. The invention further provides a preparation method of the low-melting-point copolyester, MPO is used as a main modifier, and a PEG2000, 3000 and 4000 blend is used as an auxiliary modifier. Primary hydroxyl in an MPO molecular chain enables MPO to have high reaction activity, theesterification time is shortened, by-products are few, and the prepared polyester is extremely light in color and luster and high in stability and weather resistance. The larger the addition amount of MPO is, the larger the reduction of the melting point is. A crystallization nucleating agent is introduced into a polyester macromolecular structure, so that crystallization property damage caused by MPO is improved, and the melting point is reduced.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a low melting point copolyester and a preparation method thereof. Background technique [0002] Low-melting point polyester is a modified polyester with a lower melting point, and its melting point is 100-210°C. In the field of textiles, low melting point fibers are usually made into filaments and short fibers for thermal bonding with main fibers. Due to the different materials and shapes of the fibers to be bonded, the melting point requirements for low-melting point fibers are also different. In general, 180°C can meet the requirements, and some low-melting fiber products require a melting point of 120°C or even lower, such as chenille fancy yarn. Therefore, a low-melting copolyester with a melting point of 110°C and a preparation method came into being. [0003] At present, among the commercially available low melting point polyesters with a melting point of 110°C, tests have shown ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C08K9/04C08K7/26C08K5/523
CPCC08G63/672C08G63/78C08K9/04C08K7/26C08K5/523
Inventor 杨冬雪王文林巧巧胥荣威
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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