Preparation method of high-viscosity hydrolysis resistant polybutylene terephthalate

A polybutylene terephthalate and polybutylene phthalate technology, which is applied in the field of polymer material preparation, can solve problems such as low reaction temperature, slow reaction speed, and product quality decline, and achieve high reaction efficiency , Fast response and short response time

Active Publication Date: 2017-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melt polycondensation is to further prolong the reaction time of melt polycondensation to increase the molecular weight. However, in this method, the viscosity of the material in the later stage of the reaction is high, the stirring and diffusion of by-products are difficult, the reaction speed is slow, the side reactions such as degradation are intensified, the carboxyl content increases, and the product quality declines. And the intrinsic viscosity [η] is difficult to reach more than 0.9dL / g
Solid-state polycondensation is the solid-state polycondensation of polycondensation prepolymers to achieve the required molecular weight. Due to the low reaction temperature, slow reaction speed, and long process flow of this method, some special equipment is required for large-scale industrial production.

Method used

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  • Preparation method of high-viscosity hydrolysis resistant polybutylene terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Counting by weight, weigh 100 parts of polybutylene terephthalate raw material (melt index 37g / 10min, intrinsic viscosity 0.853dL / g, viscosity average molecular weight 27325), 1 part of trimethylolpropane trimethylolpropane Acrylate, 0.5 parts of glycidyl methacrylate are evenly mixed;

[0024] (2) adopt figure 1 The twin-screw extruder shown is prepared. The length-to-diameter ratio of the twin-screw extruder is 40:1. The rear end homogenization section of the barrel of the extruder is provided with a light port, and a 1kW ultraviolet light port is installed above the light port. Light generator; set the corresponding parameters of the extruder, the screw speed is 160rpm, the feeding speed is 5rpm, the extrusion output is 6.4kg / h, the temperature is set as: feeding section 160-210℃, melting section 220-250℃, homogenization section 250°C.

[0025] (3) When the temperature of the extruder reaches the set value, the reaction extrusion starts. During this process, th...

Embodiment 2

[0027] (1) Counting by parts by weight, weigh 100 parts of polybutylene terephthalate raw materials (melt index 37g / 10min, intrinsic viscosity 0.853dL / g, viscosity average molecular weight 27325), 1 part of pentaerythritol triacrylate, 1.0 Parts of glycidyl methacrylate are evenly mixed;

[0028] (2) adopt figure 1 The twin-screw extruder shown is prepared. The length-to-diameter ratio of the twin-screw extruder is 40:1. The rear end homogenization section of the barrel of the extruder is provided with a light port, and a 1kW ultraviolet light port is installed above the light port. Light generator; set the corresponding parameters of the extruder, the screw speed is 160rpm, the feeding speed is 5rpm, the extrusion output is 6.4kg / h, the temperature is set as: feeding section 160-210℃, melting section 220-250℃, homogenization section 250°C.

[0029] (3) When the temperature of the extruder reaches the set value, the reaction extrusion starts. During this process, the glycidy...

Embodiment 3

[0031] (1) Counting by weight, weigh 100 parts of polybutylene terephthalate raw material (melt index 37g / 10min, intrinsic viscosity 0.853dL / g, viscosity average molecular weight 27325), 1.5 parts of 1,6-hexanedi Alcohol diacrylate, 0.6 parts of allyl glycidyl ether are evenly mixed;

[0032] (2) adopt figure 1 The twin-screw extruder shown is prepared. The length-to-diameter ratio of the twin-screw extruder is 40:1. The rear end homogenization section of the barrel of the extruder is provided with a light port, and a 1kW ultraviolet light port is installed above the light port. Light generator; set the corresponding parameters of the extruder, the screw speed is 160rpm, the feeding speed is 5rpm, the extrusion output is 6.4kg / h, the temperature is set as: feeding section 160-210℃, melting section 220-250℃, homogenization section 250°C.

[0033] (3) When the temperature of the extruder reaches the set value, the reaction extrusion starts. In this process, allyl glycidyl ethe...

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Abstract

The invention belongs to the technical filed of preparation of polymer materials, and discloses a preparation method of high-viscosity hydrolysis resistant polybutylene terephthalate. The method comprises the following steps: uniformly mixing 100 parts of a polybutylene telephthalate raw material, 0.01-5 parts of a functional group monomer chain extender A containing C=C and 0.01-5 parts of a functional group monomer chain extender B containing C=C and an epoxy group, adding the obtained mixture into an extruder, reacting and extruding the mixture at an extruder feeding segment temperature of 160-210 DEG C, a melting segment temperature of 220-250 DEG C and a homogenizing segment temperature of 250 DEG C, and irradiating the material in the melting segment or the homogenizing segment of the extruder with ultraviolet lights in order to obtain an extrusion product that is the high-viscosity hydrolysis resistant polybutylene terephthalate. The method for preparing the high-viscosity hydrolysis resistant polybutylene terephthalate through a two-step technology by using the extruder, the composite chain extender and ultraviolet light irradiation conditions has the advantages of short reaction time, fast reaction speed and simple device.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a preparation method of high-viscosity hydrolysis-resistant polybutylene terephthalate. Background technique [0002] Polybutylene terephthalate (PBT) has a wide range of applications due to its excellent comprehensive properties. However, since polybutylene terephthalate is formed by polycondensation, in the later stage of the reaction, the reaction rate of polycondensation decreases due to the increase of the viscosity of the reaction system, and the difficulty of heat transfer in the system causes the system to degrade, so the melt polycondensation can only obtain a certain amount of polybutylene terephthalate. Molecular weight polybutylene terephthalate. Low molecular weight polybutylene terephthalate has low viscosity, poor hydrolysis resistance and poor dimensional stability, which limit its application. [0003] There are three ways to in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F220/20C08F220/28C08F220/32
CPCC08F283/02C08F220/285C08F220/325
Inventor 何光建胡文梅袁冰玉
Owner SOUTH CHINA UNIV OF TECH
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