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Preparation method of polyesters for tyre cord yarn

A technology of tire cord and polyester, which is applied in the field of polyester synthesis, can solve the problems that cannot meet the production requirements of tire cord, and achieve high production efficiency and high quality of finished products

Inactive Publication Date: 2008-07-09
CHINA RESOURCES PACKAGING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process for preparing polyester is basically a continuous method and a gap method, and the catalysts used are basically antimony-based catalysts. The DEG content of polyester chips through solid-phase thickening is generally above 1.1%, and the terminal carboxyl group is 20meq / kg. Above, can not meet the production of tire cord

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] A kind of preparation method of polyester for tire cord, produces polyester chip, and this preparation method comprises the following steps:

[0018] 1. Firstly, dibasic alcohol and dibasic acid are mixed in a molar ratio of 1 to 1.6:1, and at the same time, toner can be added for coloring. The amount of addition can be determined according to the color of the desired product slice. The catalyst and the phosphorus heat stabilizer can be added at this time, or can be added after the end of the esterification reaction and before the start of the polycondensation reaction. The addition amount of the phosphorus heat stabilizer is based on the content of phosphorus in the total weight of polyester being 3-100ppm. The esterification reaction conditions are: temperature 210-280° C., absolute pressure 0-1 MPa, and reaction time 0.5-6 hours.

[0019] 2. After the esterification reaction is finished, the obtained oligomer is subjected to polycondensation reaction. The reaction ...

Embodiment

[0022] 1. Ethylene glycol and terephthalic acid are mixed in a molar ratio of 1.3:1, and a catalyst is added in an amount of 100 ppm of titanium and antimony in the total weight of the polyester. Mix evenly and carry out esterification reaction;

[0023] 2. The esterification reaction temperature is 250-270°C, the reaction pressure is 0.3Mpa, and the reaction time is 2.5 hours;

[0024] 3. After the esterification is finished, add phosphoric acid as a heat stabilizer, and the addition amount is 40ppm of the polyester weight. The reaction pressure is slowly reduced to 50-1KPa, and the reaction temperature is 260-275°C for pre-condensation;

[0025] 4. After the pre-condensation, the reaction pressure is lowered to <50Pa, and the temperature is 270-285°C, and the final polycondensation reaction is carried out;

[0026] 5. After the reaction is finished, after cooling, pelletizing and drying, polyester chips with an intrinsic viscosity of 0.55-0.68 can be obtained.

[0027] 6....

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PUM

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Abstract

The invention relates a process for preparing a polyester for tire builder line, and the process for preparation comprises utilizing diatomic alcohol and dibasic acid to be basic material, preparing into slurry according to molar ratio 1-1.6:1, adding into an autoclave to do esterification reaction after being evenly stirred to get low-molecular polymer, leading the low-molecular polymer to have poly condensation reaction to get polymer melt, and getting polyester chip after cooling, granulating and drying, tackifying the polyester chip in solid phase under the function of nitrogen flow to get high molecular weight polyester, adding catalyst, phosphorus heat stabilizer and toning agent in the esterification reaction or condensation stage, and getting the high molecular weight polyester whose DEG content is lower than 1%, carboxyl end group is under 15meq / kg, and inherent viscosity is more than 1.0dl / g. the polyester which is produced according to the process f the invention has excellent property, which can be applied in the production of tire builder line, and is beneficial for improving the property of the tire builder line.

Description

technical field [0001] The invention relates to a method for preparing polyester for tire cords, and belongs to the technical field of polyester synthesis. Background technique [0002] Polyester (PET) is a semi-crystalline thermoplastic material obtained by the reaction of terephthalic acid (PTA) and ethylene glycol (EG). Since its product came out, it has been favored by people because of its many excellent characteristics. In recent years, my country's automobile production has increased significantly, and the demand for radial tires has increased, while the consumption of automobile tire cords has grown synchronously. The consumption of my country's cords has reached 29,698 tons. And the current gap is still widening. The use of polyester to produce tire cords has very high requirements for raw polyester chips. The polyester has high DEG content and low viscosity, and the yarn strength is low. The high content of carboxyl groups makes polyester easy to degrade during s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/46C08G63/85D02G3/48
Inventor 朱振达安泽坤宗建平文兰傅伟铮陈旭徐梅陈小雷
Owner CHINA RESOURCES PACKAGING MATERIALS CO LTD
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