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Low-melting-point polyester and preparation method thereof

A low-melting polyester and low-melting technology, applied in the field of polyester materials, to achieve the effects of simple formula, enhanced fluidity, and increased spinning speed

Active Publication Date: 2020-04-28
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, there is no report on low-melting PET polyester fibers with a single component or a very low content of added components.

Method used

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  • Low-melting-point polyester and preparation method thereof

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preparation example Construction

[0036] A preparation method for low melting point polyester, comprising the following steps:

[0037] 1) Esterification reaction: Add terephthalic acid, ethylene glycol, low melting point modifier and catalyst together into a polymerization reactor preheated at 50-100°C, stir for 10-30min to mix evenly; add under the protection of inert gas Press and heat up, and carry out esterification reaction at 220-260°C and a pressure of 0-0.35MPa until the water effluent ends.

[0038] 2) Polycondensation reaction: evacuate for 30-90 minutes to an absolute pressure below 1000 Pa, and at the same time raise the temperature for pre-condensation reaction. The pre-condensation temperature is 260-280°C. Then carry out the final polycondensation reaction at 265-285° C. and 0-300 Pa for 10-120 minutes, discharge and pelletize after the reaction to obtain low-melting point polyester.

Embodiment 1

[0040] Add 664g of terephthalic acid, 310g of ethylene glycol, 2.0g of dipentaerythritol, and 0.3g of ethylene glycol antimony into a 2L reaction kettle, stir at 50-100°C for 15min, and then pass in N 2 , The esterification reaction starts at 230°C and 0.3MPa. After the water outlet is finished, a low vacuum is drawn, and the kettle temperature is set to 280° C. at the same time. After the vacuum instrument reaches -101kPa, the high vacuum is pumped, and the current reading is recorded after the vacuum degree reaches below 100Pa. It takes 45 minutes from the current rise to the current corresponding to the fiber-grade polyester sample. Stop the reaction, discharge and pelletize.

Embodiment 2

[0042] Add 664g of terephthalic acid, 310g of ethylene glycol, 2.0g of dipentaerythritol, and 0.3g of ethylene glycol antimony into a 2L reaction kettle, stir at 50-100°C for 15min, and then pass in N 2 , The esterification reaction starts at 233°C and 0.28MPa. After the water outlet is finished, a low vacuum is drawn, and the kettle temperature is set to 280° C. at the same time. After the vacuum gauge reaches -101kPa, draw a high vacuum, record the current reading after the vacuum degree reaches below 100Pa, and react for 90 minutes from the current rising. Stop the reaction, discharge and pelletize.

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Abstract

The invention relates to the field of polyester materials, and discloses a low-melting-point polyester and a preparation method thereof. The low-melting-point polyester comprises the following raw materials by weight: 100 parts of terephthalic acid, 40-65 parts of ethylene glycol, 0.01-1 part of a low-melting-point modifier, and 0.02-0.12 part of a catalyst. The melting point of the polyester canbe effectively reduced only by adding an extremely small amount of modifier, the thermal stability and the spinnability of the polyester are not influenced, the synthesized polyester can be used for fiber spinning, and the obtained fiber has higher elongation at break and better dyeing property than the conventional fiber.

Description

technical field [0001] The invention relates to the field of polyester materials, in particular to a low melting point polyester and a preparation method thereof. Background technique [0002] Low melting point fibers and nonwovens can be directly bonded by thermal bonding, which is more environmentally friendly and convenient than the traditional water-based adhesive bonding method. Therefore, it has always been an important direction for the development of differentiated products in the chemical fiber industry. The melting point of PET polyester fiber is about 260°C, which is relatively high, which not only increases the energy consumption of the spinning process, but also brings higher technical difficulties in the subsequent processing. [0003] There are two main methods for preparing low-melting point polyesters: (1) adding a third monomer to synthesize copolyesters, such as adding random isomeric monomers including isophthalic acid, phthalic acid and their derivatives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/668C08G63/20C08G63/60D01F6/84
CPCC08G63/668C08G63/20C08G63/60D01F6/84Y02P70/62
Inventor 冉启迪陈逸飞
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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