PET resin fast and easy to process and preparing method thereof

An easy-to-process and resin technology, applied in the field of resin, can solve the problems of uneven distribution of chemical chain extenders, different mechanical strength, low local viscosity, etc., and achieve the effects of excellent mechanical properties, narrow distribution and lower viscosity.

Inactive Publication Date: 2015-11-18
XINJIANG BLUE RIDGE TUNHE POLYESTER CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the chemical chain extender is unevenly distributed in the resin, which may easily cause low local viscosity, resulting in differe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of quick and easy processing PET resin, process is as follows:

[0021] (1) Slurry: Mix ethylene glycol and terephthalic acid at a molar ratio of 1.2:1 to prepare a slurry;

[0022] (2) Esterification: first react for 2.5-3h at a temperature of 245-270°C and a pressure of 0.2-0.27MPa, and then react for 1.5-2h at a temperature of 255-275°C and a pressure of 0.04-0.06MPa;

[0023] (3) Polycondensation: Add antimony trioxide or ethylene glycol antimony catalyst to the esterified material, and pre-condense for 1.5-2 hours at 270-285°C and 2800-3500Pa, so that the viscosity of the material after pre-condensation reaches 0.35-0.39 dl / g, and then polycondensate at 275-286°C and 80-500Pa for 1.5-2h, so that the viscosity of the material after final polymerization is ≥0.64dl / g, and then discharge and pelletize to obtain PET resin basic slices;

[0024] (4) Pre-crystallize PET resin base slices at 150-165°C to make the crystallinity reach 45-48%, and then...

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Abstract

The invention discloses a preparing method of resin fast and easy to process. The preparing method includes the steps that basic slices obtained through esterification and polycondensation of mixed slurry of glycol and terephthalic acid are crystallized in advance at the temperature of 150-165 DEG C and are crystallized at the temperature of 200-210 DEG C, the crystallization degree reaches 50-52%, the obtained crystallized slices are reacted for 8-10 hours at the temperature of 210 DEG C, viscosity reaches 0.82 dl/g or higher, pentaerythritol is added after the crystallized slices are cooled, fusion and granulation are conducted through a screw extruder, cooling in water is conducted, the obtained fused and granulated PET slices are crystallized in advance at the temperature of 150-165 DEG C and are crystallized at the temperature of 200-210 DEG C, the crystallization degree reaches 50-52 %, the obtained slices are reacted for 6-8 hours at the temperature of 210 DEG C, and viscosity reaches 0.88 dl/g or higher. Compared with other high-viscosity PET resin production methods, the molecular weight of the resin has the advantages of being narrow in distribution and even overall, and the mechanical performance of the resin is superior to that of existing PET resin with the same viscosity.

Description

technical field [0001] The invention belongs to the field of resins, and in particular relates to a fast and easy-to-process PET resin and a preparation method thereof. Background technique [0002] Polyethylene terephthalate is referred to as PET. It has excellent physical and mechanical properties in a wide temperature range. The long-term use temperature can reach 120 ° C. It has excellent electrical insulation and good dimensional stability. It is widely used in synthetic fibers. , food packaging, various films, plastic alloys and other fields. [0003] Due to the different application fields of PET synthesis, the requirements for the intrinsic viscosity index of the resin are also different. In plastic alloys, engineering plastics, and strapping, PET is required to have a higher intrinsic viscosity. [0004] In the prior art, ordinary PET resin is generally used to add a chemical chain extender through a screw extruder during processing to increase the intrinsic viscos...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08J3/00
Inventor 肖朗冒爱民徐东郭志成顾涛曹殿强
Owner XINJIANG BLUE RIDGE TUNHE POLYESTER CO LTD
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