Low-melting-point copolyester and method for preparing same

A technology of copolyester and low melting point, applied in the textile field, can solve the problems of crystallization performance damage, low intrinsic viscosity, easy adhesion, etc., and achieve the effect of good thermal adhesion, good crystallization performance and high intrinsic viscosity

Inactive Publication Date: 2009-01-07
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although they meet the requirements of low melting point, the thermal and mechanical properties of the resin become poor, especially its inherent good crystallization properties are severely damaged, and some are in an amorphous state.
Some resins of this type are easy to stick together during drying and pre-crystallization, and stick to rolls and coils durin

Method used

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  • Low-melting-point copolyester and method for preparing same
  • Low-melting-point copolyester and method for preparing same

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with specific embodiment: the low-melting point copolyester of the present invention forms through esterification reaction and polycondensation reaction with following monomer,

[0023] (a) Terephthalic acid (PTA) and isophthalic acid (IPA);

[0024] (b) 1,4 butanediol (BDO);

[0025] (c) polyethylene glycol 600-6000 (PEG);

[0026] Among them, in component a, the mass ratio of terephthalic acid to isophthalic acid is between 80-20:20-80; in component c, the weight ratio of polyethylene glycol is 1-30% based on a; a and The molar ratio of b is 1:1.5~2.3.

[0027] The low-melting copolyester has an intrinsic viscosity between 0.60-1.20 dL / g and a melting point of 110-160°C.

[0028] A kind of preparation method of low melting point copolyester as mentioned above, this method comprises two stages of esterification reaction and polycondensation reaction:

[0029] The esterification reaction is carried...

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Abstract

The invention relates to low melting point copolyester and a preparation method thereof. The low melting point copolyester is made from the following monomers followed by the esterification reaction and the polycondensation reaction: (a) terephthalic acid (PTA) and isophthalic acid (IPA), (b) 1, 4- butanediol (BDO) and (c) polyethylene glycol 600 to 6000 (PEG); wherein, in the a component, the feeding mass ratio of the terephthalic acid and the isophthalic acid is between 80 to 20 : 20 to 80; in the c component, the feeding weight ratio of polyethylene glycol is 1 to 30 percent based on the a; the molar ratio of the a and the b is 1:1.5 to 2.3. The preparation method comprises an esterifcation stage and a polycondensation stage. The copolyester has the characteristics of low melting point, good crystallization property, high intrinsic viscosity and difficult adhesion of particles, and is suitable for spinning the filament, the staple fibers and the non-woven fabrics.

Description

technical field [0001] The invention relates to a low-melting copolyester suitable for filaments, short fibers and non-woven fabrics and a preparation method thereof, belonging to the technical field of textiles. Background technique [0002] Polyester (polyethylene terephthalate) has a melting point of 265°C. According to the melting point, copolyesters with a melting point lower than 230°C are generally called low melting point polyesters. In the field of textiles, low-melting point polyester is 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 processing state, process conditions, and energy-saving considerations, the melting point requirements for low-melting point fibers are also different. Some low-melting point fibers are used for bonding non-woven fabrics. Under normal circumstances, 180°C can meet the requirements, and some low-melting fiber products require ...

Claims

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Application Information

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IPC IPC(8): C08G63/66C08G63/78D01F6/84
Inventor 陈文兴秦伟明齐庆莹凌荣根钱建华孙福程贞娟
Owner ZHEJIANG SCI-TECH UNIV
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