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Preparation method for low molecular weight polyester used for manufacturing multi-component fiber

A multi-component fiber, low molecular weight technology, applied in the field of low molecular weight polyester preparation, can solve the problem of high price of pure PTT fiber, achieve the effects of good spinnability, high bulkiness and good industrial application prospects

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the price of pure PTT fiber is high, and the development needs a process

Method used

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  • Preparation method for low molecular weight polyester used for manufacturing multi-component fiber
  • Preparation method for low molecular weight polyester used for manufacturing multi-component fiber
  • Preparation method for low molecular weight polyester used for manufacturing multi-component fiber

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Embodiment 1～9

[0024] 1) Use terephthalic acid, ethylene glycol, monomers with dicarboxylic reactive functional groups other than terephthalic acid, and monomers with dihydroxy reactive functional groups other than ethylene glycol as reaction raw materials (raw material ratio See Table 1), carry out the esterification reaction at a temperature of 250°C, the esterification pressure is 30kPa, remove the generated water during the reaction process, and when the reaction esterification rate reaches 95%, the esterification is complete;

[0025] 2) In the presence of a polycondensation catalyst, the intermediate of the esterification product is further esterified and precondensed at a reaction temperature of 260°C under the condition of -2KPa to obtain a polyester oligomer with a certain degree of polymerization, and the reaction time is 2 hours ; Then under the vacuum condition of -0.1KPa, the polycondensation reaction temperature is 280 ℃, and the reaction time is 2 hours, and the low molecular w...

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Abstract

The invention relates to a preparation method for low molecular weight polyester used for manufacturing multi-component fiber, which comprises the following steps: 1) conducting esterification reaction with reaction raw materials of terephthalic acid, ethylene-glycol and monomers of other dihydric alcohol acids; 2) further esterizing and pre-polycondensation under the condition that polycondensation catalyst is existed, and finally conducting polycondensation reaction under the condition of high negative pressure and vacuum to manufacture low molecular weight polyester. A polyester product manufactured by the invention has lower molecular weight, small content of condensation particles, and high uniformity in melt of polyester, has the characteristics of good spinnability, low rigidity in the manufactured composition fiber, high filling power, and the like, and can be used for composite spinning of the multi-component fiber; and as a result, the finished product rate and the performance are obviously improved.

Description

technical field [0001] The invention belongs to the field of preparation of low-molecular-weight polyester, in particular to a preparation method of low-molecular-weight polyester used for manufacturing multi-component fibers. Background technique [0002] Polyester materials can be used as spinnable filaments or short filaments, which can be spun with one component, and can also be spun with high-viscosity polyester, functional polyester and new polyesters such as PTT and PBT for multi-component spinning. It must include two-component or three-component composite fibers. At present, the multi-component fibers that have been industrially produced have a higher output of bi-component composite fibers. Due to the different molecular structures and physical properties of the two-component composite fibers, the performance of the composite fibers can be adjusted in a wide range, thus adapting to various performance requirements. For example, composite fibers obtained with diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/672C08G63/86D01F8/14
Inventor 任明利王雁陆慧辉陆慧良董艳朱金芳张晓静金永龙刘春秀
Owner CHINA PETROLEUM & CHEM CORP
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