Method for preparing titanium-based polyester through DMT process

A technology of titanium-based polyester and polyester is applied in the field of preparing titanium-based polyester by DMT method, which can solve the problems of easy yellowing and poor dispersibility of polyester catalyst, and achieve high dispersibility, avoid agglomeration and good compatibility. Effect

Active Publication Date: 2020-04-17
上海慧翌新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing titanium-based polyester by DMT method in order to overcome the problems of poor polyester catalyst dispersion and easy yellowing in the prior art. The prepolymer wraps the flaky titanium-based polyester catalyst, which avoids the hydrolysis of the polyester catalyst, improves the stability and dispersibility of the polyester catalyst, and reduces the amount of titanium Yellowing phenomenon of base polyester

Method used

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  • Method for preparing titanium-based polyester through DMT process
  • Method for preparing titanium-based polyester through DMT process
  • Method for preparing titanium-based polyester through DMT process

Examples

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Embodiment 1

[0044] A method for preparing a sheet-like titanium-based polyester catalyst. After mixing terephthalic acid, ethylene glycol, and n-butyl titanate at a molar ratio of 1:1.5:0.01, the temperature is 150°C and the pressure is 0.01MPa. After reacting for 0.5h under the same conditions, the temperature was raised to 200°C and the reaction was continued until the degree of esterification reached 70%. The reaction was terminated, filtered while hot, and then pulverized and ground to obtain a sheet-shaped titanium-based polyester catalyst with an average particle size of 0.5 μm.

Embodiment 2～6

[0046] A preparation method of a sheet-shaped titanium-based polyester catalyst, after mixing BT, CT and DT with a molar ratio of AT, reacting GT at a temperature of ET and a pressure of FT, then raising the temperature to HT to continue the reaction until esterification When the degree reaches IT, the reaction is terminated, filtered while hot, and then pulverized and ground to obtain a sheet-shaped titanium-based polyester catalyst with an average particle size of JT.

[0047]

Embodiment 7

[0049] A preparation method of a polyester titanium catalyst composite material system, firstly adding a mass concentration of 30wt% The ethylene glycol dispersion of the flaky titanium-based polyester catalyst, and then uniformly stirred and cooled to obtain a polyester titanium-based catalyst composite material system, wherein the flaky titanium-based polyester catalyst is prepared by Example 1, polyester The mass content of the sheet-shaped titanium-based polyester catalyst in the titanium-based catalyst composite material system body is 20 wt%.

[0050] Disperse 0.1g polyester titanium catalyst composite material system in 30mL water, heat and stir at 70°C for 3h, wash and dry the residual solid with absolute ethanol, and then perform FTIR characterization of the sample, as shown in figure 1 As can be seen from the figure, the polyester titanium series catalyst composite system sample in the present invention does not have much change in the crystal structure and character...

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Abstract

The invention relates to a method for preparing titanium-based polyester through a DMT process. The preparation method comprises the following steps: mixing DMT, EG, a polyester titanium-series catalyst composite material system and an ester exchange catalyst, and then carrying out an esterification reaction and a condensation polymerization reaction to obtain the titanium-based polyester, whereinthe polyester titanium-series catalyst composite material system is mainly composed of a polyester prepolymer with a polymerization degree of 5-30, and a flaky titanium-series polyester catalyst anda phosphorus-series stabilizer which are dispersed in the polyester prepolymer. According to the method for preparing the titanium-based polyester through the DMT process in the invention, the polyester prepolymer with a polymerization degree of 5-30 is used to wrap the flaky titanium-series polyester catalyst with excellent hydrolysis resistance, and the polyester titanium-series catalyst composite material only melts at a high temperature to release the titanium polyester-series catalyst, so the hydrolysis reaction of the titanium-series polyester catalyst caused by water contained in the storage and transportation process can be reduced or even avoided, the high dispersity and high activity of the titanium-series polyester catalyst are ensured, and the yellowing of the titanium-based polyester is reduced.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers and relates to a method for preparing titanium-based polyester by a DMT method. Background technique [0002] As the largest variety of synthetic fibers, polyester fiber has been dominating the chemical fiber market. In particular, polyethylene terephthalate (PET) in polyester fibers is widely used due to its various excellent properties. Therefore, in the absence of special instructions, most of the polyester fibers refer to PET fibers. . [0003] PET can use DMT as a raw material, produce ethylene terephthalate through transesterification, and then produce PET through multipolymerization. Because DMT is used as a raw material, it is also called DMT method. [0004] Since the invention of polyester by the British ICI company in 1947, antimony compounds are mainly used as catalysts in polyester production, such as Sb2O3 or antimony acetate. Antimony-based catalysts have the advantages o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85D01F6/92
CPCC08G63/183C08G63/85D01F6/92
Inventor 孙宾詹伟东金开元
Owner 上海慧翌新材料科技有限公司
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