PTT polyester with concentrated molecular weight distribution and preparation method thereof

A technology of molecular weight and polyester, which is applied in the field of chemical fiber processing, can solve problems such as end breakage and wool, and achieve the effects of avoiding deactivation, reducing time cost and capital cost, and improving PTT hue

Active Publication Date: 2020-07-03
ZHANGJIAGANG GLORY CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technical system is mainly through the further increase to 0.90-1.00dl/g through the polycondensation stage after obtaining a higher viscosity (all public reports in the liter

Method used

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  • PTT polyester with concentrated molecular weight distribution and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0045] Example 1

[0046] This embodiment provides a method for producing PTT polyester with concentrated molecular weight distribution, which includes the following steps:

[0047] (1) Preparation of PTT polyester prepolymer: mix terephthalic acid and 1,3-propanediol at a molar ratio of 1:1.1, mix and beat, and mix and add titanium-tin-cobalt composite catalyst and anti-ether agent sodium acetate for esterification After the reaction, until the esterification water output reaches 95% of the theoretical esterification water output, the pressure of the reactor is vented to normal pressure, and the reaction is continued for 15 minutes to obtain a PTT polyester prepolymer with low intrinsic viscosity;

[0048] Among them, the titanium-tin-cobalt composite catalyst is composed of tetrabutyl titanate, dibutyltin oxide and cobalt acetate with a molar ratio of 1:0.5:0.5. The addition amount of the titanium-tin-cobalt composite catalyst is terephthalic acid The mass fraction of (PTA) is 100...

Example Embodiment

[0058] Example 2

[0059] This embodiment provides a method for producing PTT polyester with concentrated molecular weight distribution, which includes the following steps:

[0060] (1) Preparation of PTT polyester prepolymer: mix terephthalic acid and 1,3-propanediol at a molar ratio of 1:1.5, mix and beat, and mix and add titanium-tin-cobalt composite catalyst and anti-ether agent sodium acetate for esterification After the reaction, until the esterification water output reaches 95% of the theoretical esterification water output, the pressure in the reactor is vented to normal pressure, and the reaction is continued for 30 minutes to obtain a low intrinsic viscosity PTT polyester prepolymer;

[0061] Among them, the titanium-tin-cobalt composite catalyst is composed of tetrabutyl titanate, indium tin oxide and cobalt acetate at a molar ratio of 1:0.5:0.5. The addition amount of the titanium-tin-cobalt composite catalyst is terephthalic acid (PTA). ) 150ppm of the mass fraction; th...

Example Embodiment

[0070] Example 3

[0071] This embodiment provides a method for producing PTT polyester with concentrated molecular weight distribution, which includes the following steps:

[0072] (1) Preparation of PTT polyester prepolymer: mix terephthalic acid and 1,3-propanediol at a molar ratio of 1:1.3, mix and beat, and mix and add titanium-tin-cobalt composite catalyst and anti-ether agent sodium acetate for esterification After the reaction, until the esterification water output reaches 95% of the theoretical esterification water output, the pressure in the reactor is vented to normal pressure, and the reaction is continued for 35 minutes to obtain a PTT polyester prepolymer with low intrinsic viscosity;

[0073] Among them, the titanium-tin-cobalt composite catalyst is composed of metatitanic acid, indium tin oxide and cobalt acetate at a molar ratio of 1:1:1. The addition amount of the titanium-tin-cobalt composite catalyst is terephthalic acid (PTA) 150ppm of the mass fraction; the add...

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Abstract

The invention provides PTT polyester with concentrated molecular weight distribution and a preparation method thereof. The preparation method comprises the following steps: 1, mixing terephthalic acidand 1,3-propylene glycol according to a molar ratio of 1: (1.1-1.5), carrying out pulping, then adding a titanium-tin-cobalt composite catalyst, carrying out an esterification reaction, releasing a reaction pressure to normal pressure after the water yield of esterification reaches 95% of the theoretical water yield of esterification, and continuing the reaction for 15-45 min to prepare a PTT polyester prepolymer; 2, mixing the PTT polyester prepolymer with a 1,3-propylene glycol monomer according to a molar ratio of 1: (1.05-1.10), carrying out a homogenization reaction, and sequentially carrying out a stirring pre-polycondensation reaction and a final polycondensation reaction to prepare the PTT polyester with concentrated molecular weight distribution, wherein the intrinsic viscosity of the PTT polyester prepolymer is less than or equal to 0.15 dl/g, and the addition amount of the titanium-tin-cobalt composite catalyst is 100-200 ppm of the mass fraction of the terephthalic acid.

Description

technical field [0001] The invention belongs to the field of chemical fiber processing, and relates to a PTT polyester with concentrated molecular weight distribution and a preparation method thereof. Background technique [0002] Polytrimethylene terephthalate (PTT), a new type of organic polymer aromatic polyester product belonging to the same polymer series as PET and PBT. As a new type of polyester product, PTT has excellent properties. PTT has good processability, electrical properties, mechanical properties and dimensional stability. PTT fiber maintains the excellent wrinkle resistance and chemical resistance of PET fiber, and its strength meets the textile requirements. Excellent dyeing performance is very attractive to the dyeing and finishing of fiber textiles, and it is powerful in improving economic and environmental benefits. In addition, it also has excellent flexibility, sunlight resistance, stain resistance, low static electricity, low water absorption, etc...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78C08G63/82C08G63/85D01F8/14
CPCC08G63/183C08G63/85C08G63/826C08G63/785D01F8/14Y02P70/62
Inventor 严建华韩冰
Owner ZHANGJIAGANG GLORY CHEM IND CO LTD
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