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Method for preparing high-viscosity PBT through chain extension modification with polymer

A high-viscosity, polymer technology, applied in the field of PBT processing and preparation, can solve the problems of high energy consumption, low production capacity, investment in equipment, labor and other problems, and achieve the effect of increasing viscosity, reducing the content of terminal carboxyl groups, and increasing molecular mass.

Inactive Publication Date: 2018-01-19
YANGZHOU JINSEN OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, PBT for optical cables requires high-viscosity PBT to be extruded by an extruder to produce an optical fiber loose tube. Traditional processing of high-viscosity PBT uses low-viscosity PBT resin solid-phase thickening to prepare high-viscosity PBT. This method requires negative pressure and reactor heating, which has high energy consumption and low production capacity, and the subsequent dust removal and cooling process is relatively complicated, requiring more equipment and labor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the present invention, a chain extender including a functional group reactive with carboxyl and hydroxyl is selected to extend the chain of PBT.

[0021] The chain extender is one or a mixture of dioxirane (hydroxyl) and bisoxazoline (carboxyl).

[0022] The content of the chain extender is 0.52% by weight of PBT.

[0023] In the chain extender, by weight:

[0024] Dioxirane 18%;

[0025] Bisoxazoline 82%.

[0026] Add 0.2% high-viscosity white oil to PBT with an intrinsic viscosity of 1.0dL / g, mix evenly, then add 0.52% chain extender, then add 0.3% nucleating agent, mix evenly, and use the extruder to heat and melt The chain extender acts as a reaction between the end group and the chain extender, so that the length of the chain segment increases.

[0027] In the process of chain extension, multiple additions are used for chain extension: adding dioxazoline for one chain extension, adding dioxirane for second chain extension, and adding dioxirane and dioxazolin...

Embodiment 2

[0033] In the present invention, a chain extender including a functional group reactive with carboxyl and hydroxyl is selected to extend the chain of PBT.

[0034] The chain extender is one or a mixture of dioxirane (hydroxyl) and bisoxazoline (carboxyl).

[0035] The content of the chain extender is 0.2% by weight of PBT.

[0036] In the chain extender, by weight:

[0037] Dioxirane 20%;

[0038] Bisoxazoline 80%.

[0039] Add 0.4% high-viscosity white oil to PBT with an intrinsic viscosity of 0.8dL / g, mix evenly, then add 0.42% chain extender, then add 0.1% nucleating agent, mix evenly, and use the extruder to heat and melt The chain extender acts as a reaction between the end group and the chain extender, so that the length of the chain segment increases.

[0040] In the process of chain extension, multiple additions are used for chain extension: adding dioxazoline for one chain extension, adding dioxirane for second chain extension, and adding dioxirane and dioxazoline...

Embodiment 3

[0046] In the present invention, a chain extender including a functional group reactive with carboxyl and hydroxyl is selected to extend the chain of PBT.

[0047] The chain extender is one or a mixture of dioxirane (hydroxyl) and bisoxazoline (carboxyl).

[0048] The content of the chain extender is 0.058% by weight of PBT.

[0049] In the chain extender, by weight:

[0050] Dioxirane 26%;

[0051] Bisoxazoline 74%.

[0052] Add 0.09% high-viscosity white oil to PBT with an intrinsic viscosity of 1.1dL / g, mix evenly, then add 0.48% chain extender, then add 0.37% nucleating agent, mix evenly, and use the extruder to heat and melt The chain extender acts as a reaction between the end group and the chain extender, so that the length of the chain segment increases.

[0053] In the process of chain extension, multiple additions are used for chain extension: adding dioxazoline for one chain extension, adding dioxirane for second chain extension, and adding dioxirane and dioxazo...

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Abstract

The present invention relates to a method for preparing high-viscosity PBT through chain extension modification with a polymer, wherein PBT is subjected to chain extension by selecting a chain extender containing a functional group capable of reacting with carboxyl and hydroxyl. According to the present invention, the used chain extender reacts with the carboxyl and hydroxyl prepolymer to diffuseand extend the molecular chain, such that the curing molding of the resin is achieved; in the polyester processing process, the molecular weight is decreased and the number of the terminal carboxyl isincreased due to the thermal degradation and the hydrolysis, such that the mechanical performance and the chemical performance of the polymer are reduced; the bifunctional small molecule compounds are added under the reactive blending condition, contain the functional groups capable of easily reacting with carboxyl, hydroxyl and the like, and can directly react with low molecular weight oligomers, such that the bridging is formed between the two polymer chains so as to significantly increase the molecular weight, improve the viscosity of the system, and reduce the terminal carboxyl content; and the polyester chain extension comprises: selecting a compound, and carrying out addition on the compound and hydroxyl or carboxyl.

Description

technical field [0001] The invention relates to a method for preparing high-viscosity PBT by polymer chain extension modification, and belongs to the technical field of PBT processing and preparation. Background technique [0002] Polybutylene terephthalate (PBT), PBT is a thermoplastic polyester plastic, suitable for use by different processors. Generally, PBT for optical cables requires high-viscosity PBT to be extruded by an extruder to produce an optical fiber loose tube. Traditional processing of high-viscosity PBT uses low-viscosity PBT resin solid-phase thickening to prepare high-viscosity PBT. This method requires negative pressure and reactor heating, which has high energy consumption and low production capacity, and the subsequent dust removal and cooling process is more complicated, requiring more equipment and labor. Contents of the invention [0003] In view of the above defects, the present invention aims to provide a chemical chain extension method for melt...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/183
Inventor 王君
Owner YANGZHOU JINSEN OPTOELECTRONICS
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