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Method for producing high molecular weight polyester

A high-molecular-weight polyester technology, which is applied in the field of solid-state polycondensation to produce high-viscosity polyester, can solve problems such as inability to carry out the reaction, high operating costs, and influence on the reaction speed, so as to shorten the reaction time, increase production capacity, and improve The effect of reaction speed

Active Publication Date: 2011-07-20
SINOPEC OILFIELD SERVICE CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are the following disadvantages in the solid-state polycondensation process: (1) Compared with the melt polycondensation, since the polyester chips are above the glass transition temperature, fusion bonding will occur, which will affect the removal of the by-products of the solid-phase polycondensation reaction. In addition, the reaction speed will be affected, and the reactor will be blocked in severe cases, so that the reaction cannot be carried out.
(2) As the solid-state polycondensation reaction proceeds, the concentration of end groups decreases and the reaction rate slows down
US4742151 adopts the method for solution phase polymerization to produce high molecular weight polyester, although high molecular weight polyester can be obtained, there are also problems such as solvent pollution, high operating costs and long technical process

Method used

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  • Method for producing high molecular weight polyester
  • Method for producing high molecular weight polyester

Examples

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Embodiment 1

[0020] Terephthalic acid (PTA) 20kg, ethylene glycol 10kg, catalyst antimony acetate (Sb(0Ac) 3) 9.3g is made into slurry; The ethylene glycol slurry is esterified in the first esterification still, pressure 0.11Mpa, The temperature is 257°C; the material in the first esterification reactor continues to be esterified in the second esterification reactor, the pressure is 0.1Mpa, and the temperature is 265°C; the esterified product enters the pre-condensation reactor for pre-condensation, the temperature is 273°C, and the pressure is 0.025Mpa The product after pre-condensation enters the polycondensation reactor for polycondensation at a temperature of 278°C and a pressure of 0.01Mpa; the product after polycondensation enters a final polycondensation reactor for polycondensation at a temperature of 285°C and a pressure of 100pa. The final polycondensation product is cooled and pelletized by casting rods to obtain slices of 2×2×3 mm, and prepolymer slices with an intrinsic viscosi...

Embodiment 2

[0023] Terephthalic acid (PTA) 20kg, ethylene glycol 10kg, catalyst antimony acetate (Sb(0Ac) 3 ) 9.3g into a slurry; the ethylene glycol slurry is esterified in the first esterification tank with a pressure of 0.11Mpa and a temperature of 257°C; the material in the first esterification tank continues to be esterified in the second esterification reactor with a pressure of 0.1Mpa, temperature 265°C; the esterified product enters the pre-condensation reactor for pre-condensation, the temperature is 273°C, and the pressure is 0.025Mpa; the pre-condensation product enters the polycondensation reactor for condensation, the temperature is 278°C, the pressure is 0.01Mpa; Enter the final polycondensation reactor for polycondensation at a temperature of 285°C and a pressure of 100pa. The final polycondensation product is cooled and pelletized by casting rods to obtain slices of 2×2×3 mm, and prepolymer slices with an intrinsic viscosity of 0.62 dl / g.

[0024]Prepolymer PET slices wer...

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Abstract

The invention discloses a method for producing high molecular weight polyester, comprising: firstly PTA is matched with glycol for obtaining slurry and later a prepolymer raw material is obtained by esterification and polycondensation; next, the prepolymer raw material is cut into small particle slices which are firstly pre-crystallized for 10-40min at 150-190 DEG C and then crystallized for 10-40min at 170-210 DEG C for a second time; finally, polycondensation is carried out to the crystallized slices for 12-60h within the scope of 200-240 DEG C by using a method of increasing the temperature gradually by section or step and the high molecular weight polyester is obtained. The method can significantly improve the solid-phase polycondensation reaction rate, shorten the reaction time, and improve the production capacity.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a process for producing high-viscosity polyester by a solid-state polycondensation method. Background technique [0002] High-viscosity polyester is widely used in polyester bottles, industrial yarns, sheets and other fields, and solid-state polycondensation is the main method for producing high-viscosity polyester. There are mainly three patent providers in the world: Sinco, Buhler and Bepex. The solid-state polycondensation process route is roughly the same, and they all use the experience of fiber production. They use amorphous basic slices as raw materials, and undergo solid-state polycondensation after one or more times of heating and crystallization. After reaction, high viscosity polyester product is obtained after cooling. For example, in the Buhler process, the amorphous basic slices are first heated from room temperature to 140-160°C in the pre-crystallizer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/78C08G63/80C08G63/88
Inventor 张军张建
Owner SINOPEC OILFIELD SERVICE CORPORATION