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Solid phase polymerization technology of PET (polyethylene terephthalate) with high intrinsic viscosity

A technology of intrinsic viscosity and solid state polymerization, applied in the direction of one-component polyester rayon, etc., can solve the problems of high added value, high technical difficulty, large market gap, etc., and achieve low thermal shrinkage and initial modulus. high effect

Active Publication Date: 2018-05-29
ANHUI DONGJIN RESOURCE REGENERATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical difficulty of the product is high, but the added value is high and the market gap is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high intrinsic viscosity PET solid-phase polymerization process, the steps are as follows:

[0027] S1. Pretreat the recycled PET raw material, and then melt it to obtain recycled PET melt;

[0028] S2. Send the recovered PET melt into a disc rotor reactor or a cage reactor, heat up to melt the PET scrap to obtain a PET melt, then put in a viscosifying nucleating agent, stir evenly, and the temperature is 240-260 degrees Celsius. Nitrogen insulated to increase viscosity for 40 minutes;

[0029] Wherein the tackifying nucleating agent is made of the following components by weight percentage: ethylene glycol 60%, antimony oxide 20%, germanium oxide 20%; wherein the input amount of tackifying nucleating agent accounts for 2% of PET melt weight -5%;

[0030] Among them, the viscosity-increasing formula and process of recycling PET melt are important technical links. Determine the amount of chain extenders such as ethylene glycol, and the types and amounts of catalysts s...

Embodiment 2

[0034] A high intrinsic viscosity PET solid-phase polymerization process, the steps are as follows:

[0035] S1. Pretreat the recycled PET raw material, and then melt it to obtain recycled PET melt;

[0036] S2. Send the recovered PET melt into a disc rotor reactor or a cage reactor, heat up to melt the PET scrap to obtain a PET melt, then put in a viscosifying nucleating agent, stir evenly, and the temperature is 240-260 degrees Celsius. Nitrogen insulated to increase viscosity for 40 minutes;

[0037] Wherein the tackifying nucleating agent is made of the following components by weight percentage: ethylene glycol 60%, antimony oxide 20%, germanium oxide 20%; wherein the input amount of tackifying nucleating agent accounts for 2% of PET melt weight -5%;

[0038] Among them, the viscosity-increasing formula and process of recycling PET melt are important technical links. Determine the amount of chain extenders such as ethylene glycol, and the types and amounts of catalysts s...

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Abstract

A solid phase polymerization technology of PET (polyethylene terephthalate) with high intrinsic viscosity comprises the following steps: S1, a recycled PET material is pretreated and then molten, anda recycled PET melt is obtained; S2, the recycled PET melt is sent to a disc rotor type reactor or a cage-like reactor and heated to be molten, a PET melt is obtained, a tackifying nucleating agent isadded, the mixture is stirred uniformly, nitrogen is introduced at 240-260 DEG C, and the mixture is kept at the constant temperature for tackifying for 40 min; S3, the recycled PET melt obtained after tackifying polymerization is granulated, and regenerated PET granules are obtained and can be used in a spinning process. Recycled PET bottle chips or recycled pure PET fiber are used as raw materials, PET with high intrinsic viscosity is prepared through tackifying and solid phase polymerization, and the prepared product has high initial modulus, low heat shrinkage, fatigue resistance, water resistance and other excellent performance.

Description

Technical field: [0001] The invention relates to the technical field of resource regeneration, in particular to a high intrinsic viscosity PET solid-phase polymerization process. Background technique: [0002] With the rapid development of the global polyester industry, the polyester industry is facing a serious problem: the source of raw materials and the disposal of waste. Finding new available raw material resources and how to effectively utilize polyester waste materials have become a strategic goal faced by countries. [0003] The use of recycled polyester bottle flakes to produce regenerated fibers is the main way of polyester recycling and reuse in my country. However, these fibers are mainly low-end cotton-type and filling-type products. Due to the expansion of production capacity and serious homogeneity, regenerated fiber enterprises in a low-profit state. Therefore, the high-end and differentiated regenerated fiber is very necessary. At present, although many dom...

Claims

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Application Information

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IPC IPC(8): C08G63/91D01F6/62
CPCC08G63/916D01F6/62
Inventor 施文东祝建勋黄振
Owner ANHUI DONGJIN RESOURCE REGENERATION SCI & TECH
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