Rubber-reinforcing polyester cord and method for producing the same

Abstract

It is provided a polyester cord for reinforcement of rubber suitable to the use for tire cap ply where a high elastic modulus is available and heat-resisting adhesive property and strength retaining rate upon exposure to high temperature for long time in rubber are significantly improved and also to provide a method for producing the same. A method for production of polyester cord for reinforcement of rubber, characterized in that , in bestowing adhesive property to rubber on a polyester fiber material, four members of (A) a treating solution containing a carrier, (B) an aqueous solution of a blocked isocyanate, (C) a dispersion of an epoxy compound and (D) a mixed solution of resorcinol-formaldehyde-latex (RFL) are combined as a treating solution and said polyester fiber material is subjected to a treatment by means of a one-stage or two or more multi-stage treatment, wherein said polyester fiber material is treated with a first treating solution compounded at least with (A) a treating solution containing a carrier, then treated with a second treating solution where at least (D) a mixed solution of resorcinol-formaldehyde-latex (RFL) is compounded and, after treating with the second treating solution in the final stage, a thermal treatment under a normalizing tension adjusted to not less than 0.2 cN / dtex is carried out.

Description

technical field

[0001] The invention relates to a polyester cord for rubber reinforcement and a manufacturing method thereof. The polyester cord for rubber reinforcement is exposed to high temperature conditions in rubber for a long time, and the heat-resistant adhesion and strength retention rate have been significantly improved.

[0002] The rubber-reinforcing polyester cord obtained according to the present invention is suitable for tire cords, especially tire cap ply cords used for the outer layer portion of a reinforcing belt of a radial tire. Background technique

[0003] Polyester fibers represented by polyethylene terephthalate have excellent mechanical properties, dimensional stability, and durability, and are widely used in industrial materials, especially tire cords, V-belts, and conveyor belts , hoses and other rubber reinforcement purposes.

[0004] When used in tire cords, properties of high strength, high modulus of elasticity, low shrinkage, adhesion and fat...

Examples

Embodiment 1

[0068]Polyethylene terephthalate chips with an intrinsic viscosity of 0.95dl / g are melted and sprayed from a spinneret with 190 holes at a spinning temperature of 300°C, passed through a heating zone of 320°C, and then processed by 20 The cooling wind at ℃ cools and solidifies it, draws it at a spinning speed of 550m / min, and then stretches it with a draw ratio of 5.8 times, and imparts sorbitol polyglycidyl ether as an epoxy compound to make it relax. 3.0% after coiling. 2 strands of polyethylene terephthalate precursors (intrinsic viscosity 0.88dl / g, strength 8.3cN / dex) obtained in this way of 1100dex, 190 filaments are ply twisted to obtain a twist number of 47×47(t / 10cm) billet line.

[0069] This cord was immersed in 1 treatment solution, and the cord soaked in the treatment solution was wrung with a squeeze roller with adjusted pressure to remove excess solution. Then, the cords to which the treatment liquid was applied were dried in an oven at 120° C. for 56 seconds ...

Embodiment 2

[0072] In the treatment of Example 1, the relaxation rate during drying and heat treatment after application of the second treatment liquid was changed to -1.0%. The normalized tension at this time is 8.1N / cord (0.37cN / dtex). Except for this, the immersion treatment was performed using the same strand and treatment liquid as in Example 1.

Embodiment 3

[0074] In the treatment of Example 1, the relaxation rate during drying and heat treatment after application of the second treatment liquid was changed to 0%, and the normalized tension at this time was 10.6 N / cord (0.48 cN / dtex). Except for this, the immersion treatment was performed using the same strand and treatment liquid as in Example 1.

technical field

[0001] The invention relates to a polyester cord for rubber reinforcement and a manufacturing method thereof. The polyester cord for rubber reinforcement is exposed to high temperature conditions in rubber for a long time, and the heat-resistant adhesion and strength retention rate have been significantly improved.

[0002] The rubber-reinforcing polyester cord obtained according to the present invention is suitable for tire cords, especially tire cap ply cords used for the outer layer portion of a reinforcing belt of a radial tire. Background technique

[0003] Polyester fibers represented by polyethylene terephthalate have excellent mechanical properties, dimensional stability, and durability, and are widely used in industrial materials, especially tire cords, V-belts, and conveyor belts , hoses and other rubber reinforcement purposes.

[0004] When used in tire cords, properties of high strength, high modulus of elasticity, low shrinkage, adhesion and fat...

Examples

Embodiment 1

[0068]Polyethylene terephthalate chips with an intrinsic viscosity of 0.95dl / g are melted and sprayed from a spinneret with 190 holes at a spinning temperature of 300°C, passed through a heating zone of 320°C, and then processed by 20 The cooling wind at ℃ cools and solidifies it, draws it at a spinning speed of 550m / min, and then stretches it with a draw ratio of 5.8 times, and imparts sorbitol polyglycidyl ether as an epoxy compound to make it relax. 3.0% after coiling. 2 strands of polyethylene terephthalate precursors (intrinsic viscosity 0.88dl / g, strength 8.3cN / dex) obtained in this way of 1100dex, 190 filaments are ply twisted to obtain a twist number of 47×47(t / 10cm) billet line.

[0069] This cord was immersed in 1 treatment solution, and the cord soaked in the treatment solution was wrung with a squeeze roller with adjusted pressure to remove excess solution. Then, the cords to which the treatment liquid was applied were dried in an oven at 120° C. for 56 seconds ...

Embodiment 2

[0072] In the treatment of Example 1, the relaxation rate during drying and heat treatment after application of the second treatment liquid was changed to -1.0%. The normalized tension at this time is 8.1N / cord (0.37cN / dtex). Except for this, the immersion treatment was performed using the same strand and treatment liquid as in Example 1.

Embodiment 3

[0074] In the treatment of Example 1, the relaxation rate during drying and heat treatment after application of the second treatment liquid was changed to 0%, and the normalized tension at this time was 10.6 N / cord (0.48 cN / dtex). Except for this, the immersion treatment was performed using the same strand and treatment liquid as in Example 1.

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