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Regenerated PTT polymer and preparation method and application thereof

A technology for polymer and polycondensation, applied in the field of polymerization, can solve the problems of high cost and large environmental pollution, and achieve the effect of less side reaction products, good quality, and reducing reverse side reactions

Pending Publication Date: 2022-07-29
FUJIAN SAILON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite catalyst contains a germanium compound, and the cost is too high; and the germanium compound contains heavy metals, which causes great environmental pollution

Method used

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  • Regenerated PTT polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 A kind of preparation of regenerated PTT polymer

[0041] Using the hosiery material (140kg) with a polyester fiber content of 91% as the raw material, 104.8kg of crude DMT was obtained through alcoholysis and transesterification, and the yield was 104.8÷(140×91%)=82.3%. 104.8 kg of crude DMT was rectified to obtain 97 kg of technically pure DMT. 97kg of refined DMT was subjected to subsequent reactions in two batches, the first batch of 47kg and the second batch of 50kg.

[0042] The first batch: 47kg of refined DMT and 43kg of 1,3-propanediol (1,3-PDO) were added to the reactor. Under normal pressure, the temperature in the reaction kettle was raised to 70 °C, and the reaction was carried out for 1.5 h. Then, add composite catalyst and stabilizer to the reactor, vacuumize, reduce the pressure to a vacuum negative pressure of 25Pa, maintain this vacuum for 100 minutes, and control the reaction temperature at 260~280 ℃ to obtain 47.8kg of regenerated PTT ...

Embodiment 2

[0045] Embodiment 2 A kind of preparation of regenerated PTT polymer

[0046] Using hosiery material (150kg) with polyester fiber content of 96% as raw material, 121.6kg crude DMT was obtained through alcoholysis and transesterification reaction, and the yield was 121.6÷(150×96%)=84.44%. 121.6 kg of crude DMT was rectified to obtain 111.5 kg of technically pure DMT. 111.5kg of refined DMT was subjected to subsequent reactions in two batches, the first batch of 55kg and the second batch of 56.5kg.

[0047] The first batch: 55kg of refined DMT and 50.3kg of 1,3-propanediol (1,3-PDO) were added to the reactor. Under normal pressure, the temperature in the reaction kettle was raised to 80 °C, and the reaction was carried out for 1.5 h. Next, add composite catalyst and stabilizer to the reactor, vacuumize, reduce the pressure to a vacuum negative pressure of 30Pa, maintain this vacuum for 100 minutes, and control the reaction temperature at 260~280 ℃ to obtain 56.5kg of regenerat...

experiment example

[0056] Performance tests were performed on the regenerated PTT slices of Examples 1 to 2 and Comparative Example 1, and the test results are shown in Table 1.

[0057] (1) Determination method of intrinsic viscosity: adopt GB / T14189-93 standard and test with automatic viscosity tester. Using 1:1 phenol / tetrachloroethane as the solvent, the melting temperature of the slices is 90-100°C, and the temperature control range of the viscometer water bath is 25±0.05°C.

[0058] (2) Determination method of melting point: adopt GB / T14189-93 standard and test with polarizing microscope.

[0059] (3) Determination method of chromaticity B value (yellow index): adopt GB / T14189-93 standard and test with SC-100 automatic color difference meter. The test temperature was room temperature, the number of tests was 5 times, and the results were averaged.

[0060] Hue is an important indicator of PTT products, usually expressed by B value. When the B value of the product is larger, the color of...

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Abstract

The invention relates to a regenerated PTT polymer and a preparation method and application thereof. According to the preparation method, the recycled PET is used as a raw material, DMT is prepared through alcoholysis and transesterification, polymer conversion is achieved through transesterification, recycling of waste PET resources is achieved, new polymer PTT is manufactured through conversion, and the method is safe, non-toxic, green and environmentally friendly; after refined DMT and PDO are subjected to transesterification, a catalytic system compounded by a titanium catalyst and a plurality of metal ion solutions is used as a catalyst in a PTT polymerization process, so that effective balance between rapid reaction and product quality is achieved, the quality stability in the production process is controllable, and compared with a pure titanium catalyst, the method has the advantages that the yield is high; according to the preparation method, the inhibition effect on side reactions is obviously improved, and the B value is obviously reduced. The PTT polymer finally prepared by the preparation method disclosed by the invention is relatively narrow in molecular weight distribution, few in side reaction products and good in quality, can be used for preparing fibers, films or engineering plastic products, and has a great application prospect.

Description

technical field [0001] The invention relates to the technical field of polymerization, in particular to a regenerated PTT polymer and a preparation method and application thereof. Background technique [0002] Polytrimethylene terephthalate (referred to as PTT), polyethylene terephthalate (referred to as PET) and polybutylene terephthalate (referred to as PBT) are both semi-aromatic polyesters, PTT There are three methylene groups in each chain link, and the "odd carbon effect" is generated between the macromolecules to form a helical arrangement, so that the PTT polyester fiber can overcome the rigidity of PET and the flexibility of PBT at the same time, and has both the properties of PET and PA. Advantages, such as excellent resilience, easy processing, easy dyeing, bulkiness, etc. In addition, PTT also has good chemical resistance, anti-fouling and low electrostatic properties, so PTT polyester has great development and application value in engineering plastics, fibers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/85C08G63/86C08G63/83C08G63/183
CPCC08G63/85C08G63/866C08G63/83C08G63/183
Inventor 何博文朱恩斌朱福和
Owner FUJIAN SAILON TECH CO LTD
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