Preparation method of polyester industrial yarn for tire cord

Abstract

The invention relates to a preparation method of polyester industrial yarn for tire cords. Modified polyester melt is subjected to solid-phase polycondensation tackifying, melting, metering, extrusion, cooling, oiling, stretching, heat setting, relaxation heat treatment and winding, and the polyester industrial yarn for the tire cords is prepared. A preparation method of the modified polyester melt comprises the following steps: uniformly mixing terephthalic acid, ethylene glycol and diol with tert-butyl pendant groups, and performing an esterification reaction and a polycondensation reactionsequentially. The prepared polyester industrial yarn has dry heat shrinkage rate being 2.0%-3.0% and initial modulus being higher than or equal to 120.0 cN / dtex under the condition of 177 DEG C*10 min*0.05 cN / dtex. The adhesive strength of the tire cords prepared from the polyester industrial yarn for the tire cords is 55-60 N / cm. The method is simple in process, and the tire cords prepared from the polyester industrial yarn have good fatigue resistance and adhesion performance.

Description

technical field

[0001] The invention belongs to the technical field of modified polyester fibers, and relates to a method for preparing polyester industrial yarns used for tire cords. Background technique

[0002] Polyester is the trade name of polyester fiber in my country, and it is an important variety in synthetic fibers. Or the fiber-forming high polymer prepared by transesterification and polycondensation reaction - polyethylene terephthalate (PET), and then the fiber made by spinning and post-processing. In the early days of the advent of polyester, it was mainly used for clothing, and its varieties were mainly cotton-type and wool-type staple fibers and ordinary filaments. Due to the high melting point, excellent mechanical properties and excellent chemical resistance of polyester fiber, and with the increasingly saturated polyester clothing industry, the application of polyester is gradually expanding to the direction of industrial use.

[0003] The development and...

Examples

Embodiment 1

[0066] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0067] (1) prepare modified polyester;

[0068] (1.1) Preparation of 2,6,6-trimethyl-2,5 heptanediol;

[0069] (a) Mix potassium hydroxide aqueous solution and isobutanol at a ratio of 5:1 in a molar ratio of isobutanol to potassium hydroxide, and react for 4 hours at a temperature of 100° C. to obtain potassium isobutoxide. During the reaction, With stirring, the mass concentration of potassium hydroxide aqueous solution is 43%;

[0070] (b) After removing the impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide to xylene of 1.3:2.2, and cool to 1°C ;

[0071] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethylpropanal into the system of (b), react at a temperature of 25°C for 3 hours, then carry out cooling crystallization and centrifugation And dr...

Embodiment 2

[0086] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0087] (1) prepare modified polyester;

[0088] (1.1) Preparation of 2,6,6-trimethyl-2,5 heptanediol;

[0089] (a) Mix potassium hydroxide aqueous solution and isobutanol at a ratio of 5.5:1 in a molar ratio of isobutanol to potassium hydroxide, and react for 5 hours at a temperature of 100° C. to prepare potassium isobutoxide. During the reaction, With stirring, the mass concentration of potassium hydroxide aqueous solution is 40%;

[0090] (b) After removing impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide and xylene of 1.3:2.0, and cool to 3°C ;

[0091] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethylpropanal into the system of (b), react at a temperature of 30°C for 3 hours, then carry out cooling crystallization and centrifugation And dry ...

Embodiment 3

[0102] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0103] (1) prepare modified polyester;

[0104] (1.1) Preparation of 2,6,6-trimethyl-5-ethyl-2,5-heptanediol;

[0105] (a) Mix potassium hydroxide aqueous solution and isobutanol according to the ratio of isobutanol to potassium hydroxide molar ratio of 5:1, and react at a temperature of 105°C for 4.5h to obtain potassium isobutoxide. During the reaction Accompanied by stirring, the mass concentration of potassium hydroxide aqueous solution is 48%;

[0106] (b) After removing impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide to xylene of 1.5:2.5, and cool to 0°C ;

[0107] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethyl-3-pentanone into the system of (b), react at 30°C for 3 hours, and then carry out cooling crystallization , centrifugal separ...

technical field

[0001] The invention belongs to the technical field of modified polyester fibers, and relates to a method for preparing polyester industrial yarns used for tire cords. Background technique

[0002] Polyester is the trade name of polyester fiber in my country, and it is an important variety in synthetic fibers. Or the fiber-forming high polymer prepared by transesterification and polycondensation reaction - polyethylene terephthalate (PET), and then the fiber made by spinning and post-processing. In the early days of the advent of polyester, it was mainly used for clothing, and its varieties were mainly cotton-type and wool-type staple fibers and ordinary filaments. Due to the high melting point, excellent mechanical properties and excellent chemical resistance of polyester fiber, and with the increasingly saturated polyester clothing industry, the application of polyester is gradually expanding to the direction of industrial use.

[0003] The development and...

Examples

Embodiment 1

[0066] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0067] (1) prepare modified polyester;

[0068] (1.1) Preparation of 2,6,6-trimethyl-2,5 heptanediol;

[0069] (a) Mix potassium hydroxide aqueous solution and isobutanol at a ratio of 5:1 in a molar ratio of isobutanol to potassium hydroxide, and react for 4 hours at a temperature of 100° C. to obtain potassium isobutoxide. During the reaction, With stirring, the mass concentration of potassium hydroxide aqueous solution is 43%;

[0070] (b) After removing the impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide to xylene of 1.3:2.2, and cool to 1°C ;

[0071] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethylpropanal into the system of (b), react at a temperature of 25°C for 3 hours, then carry out cooling crystallization and centrifugation And dr...

Embodiment 2

[0086] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0087] (1) prepare modified polyester;

[0088] (1.1) Preparation of 2,6,6-trimethyl-2,5 heptanediol;

[0089] (a) Mix potassium hydroxide aqueous solution and isobutanol at a ratio of 5.5:1 in a molar ratio of isobutanol to potassium hydroxide, and react for 5 hours at a temperature of 100° C. to prepare potassium isobutoxide. During the reaction, With stirring, the mass concentration of potassium hydroxide aqueous solution is 40%;

[0090] (b) After removing impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide and xylene of 1.3:2.0, and cool to 3°C ;

[0091] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethylpropanal into the system of (b), react at a temperature of 30°C for 3 hours, then carry out cooling crystallization and centrifugation And dry ...

Embodiment 3

[0102] The preparation method of the polyester industrial yarn that is used for tire cord, the steps are as follows:

[0103] (1) prepare modified polyester;

[0104] (1.1) Preparation of 2,6,6-trimethyl-5-ethyl-2,5-heptanediol;

[0105] (a) Mix potassium hydroxide aqueous solution and isobutanol according to the ratio of isobutanol to potassium hydroxide molar ratio of 5:1, and react at a temperature of 105°C for 4.5h to obtain potassium isobutoxide. During the reaction Accompanied by stirring, the mass concentration of potassium hydroxide aqueous solution is 48%;

[0106] (b) After removing impurities in the system of (a) and lowering to normal temperature, add xylene to the system of (a) according to the molar ratio of potassium isobutoxide to xylene of 1.5:2.5, and cool to 0°C ;

[0107] (c) After adding 3-methyl-3-hydroxybutyne and 2,2-dimethyl-3-pentanone into the system of (b), react at 30°C for 3 hours, and then carry out cooling crystallization , centrifugal separ...

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