JP2853961B2 - Polyester fiber for power transmission belt and production method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber for a power transmission belt having a low heat shrinkage rate and excellent adhesive permeability and a method for producing the same.

[0002]

2. Description of the Related Art Polyester fibers containing ethylene terephthalate as a main repeating unit have excellent properties such as strength, initial modulus and dimensional stability, but are generally inferior in adhesiveness to rubber. Treatment with an adhesive solution using an epoxy compound, isocyanate compound, etc., or a resorcinol / formalin / latex mixed solution (hereinafter, referred to as
(Referred to as RFL), and are widely used as rubber reinforcing fibers for tires, hoses, etc., including transmission belts such as V-belts and conveyor belts.

In particular, since a power transmission belt such as a fan belt for an automobile is used in an engine room, it is preferable that the belt performance and physical properties change little even in a high temperature atmosphere and under a high tension. There is a demand for highly bunched polyester fibers having excellent permeability. However, at present, they have not been satisfied at the same time.

[0004] As polyester fibers or polyester tire cords having a low shrinkage ratio, Japanese Patent Application Laid-Open No. Hei 4-22221 is disclosed.
No. 5, Japanese Patent Application Laid-Open No. 5-59627, the conventional adhesive liquid or RFL treatment alone is insufficient in the permeability of the adhesive, resulting in poor convergence. It becomes a problem. On the other hand, a large number of treatment liquids for improving the affinity between the polyester fiber and the adhesive and methods for using the same have been proposed. For example, JP-A-48-27017, JP-A-59-21626, and JP-B-4-44033 disclose ethylene oxide and / or aliphatic amine.
Alternatively, there is disclosed a method for producing a rubber reinforcing polyester fiber which is treated with a spinning oil agent containing a propylene oxide adduct and stretch-treated.

However, it is difficult to obtain a polyester fiber having a low shrinkage due to a low spinning speed and a relatively high intrinsic viscosity. When the oil containing the above-mentioned components is applied at a high speed spinning speed of 6.0 km / min or more, the mist of the oil is scattered and the working environment is deteriorated due to a strong amine odor. Again, there is a problem that the odor and the fouling of the roll surface are frequently caused by the smell of the roll, and the workability and productivity are reduced.

Japanese Patent Application Laid-Open No. Hei 4-257374 discloses a method of applying a specific treatment liquid to a polyester undrawn yarn after subjecting it to a heat drawing treatment to improve the adhesiveness. Is still insufficient shrinkage. In addition, according to the investigations of the present invention and the like, it has been clarified that when the treatment liquid is applied immediately after the relaxation heat treatment, the shrinkage ratio increases.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester fiber for a power transmission belt having a low shrinkage rate and excellent adhesive permeability and a method for producing the same in order to optimize the working environment and improve production efficiency. To provide.

[0008]

Means for Achieving the Object The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by adding an amine compound to a high-speed spun yarn subjected to hot drawing and relaxing heat treatment, The present inventors have found that a polyester fiber having excellent bunching properties can be obtained without impairing low shrinkage, and arrived at the present invention.

That is, the present invention relates to a polyester fiber comprising ethylene terephthalate as a main repeating unit, wherein (a) the intrinsic viscosity is 0.50 to 0.75, and (b) the dry heat shrinkage is 2.0% or less. And (c) polyester fibers for a power transmission belt having an adhesion rate of an ethylene oxide and / or propylene oxide adduct of an aliphatic amine of 0.15% by weight or more.

This fiber has an intrinsic viscosity of 0.50 to 0.50.
A polyester chip mainly containing 0.80 ethylene terephthalate as a main repeating unit is melt-spun at a spinning speed of 6 km / min or more, subjected to hot stretching and relaxing heat treatment, and then added with ethylene oxide and / or propylene oxide of an aliphatic amine. And a process for producing a polyester fiber for a power transmission belt, which comprises applying a treating agent containing a substance.

The intrinsic viscosity of the polyester fiber of the present invention is:
It is 0.50 to 0.75, and if it is in this range, it is possible to have sufficient strength for a power transmission belt and to obtain a low shrinkage yarn having a shrinkage ratio of 2.0% or less. However, if it is less than 0.50, the strength is low, while on the other hand, it is less than 0.5.
If it exceeds 75, it becomes difficult to obtain a low shrinkage yarn. By setting the dry heat shrinkage to 2.0% or less, belt deformation due to heat shrinkage is suppressed even in a high-temperature atmosphere, and the initial belt performance can be expected for a long time. However, if it exceeds 2.0%, the belt is easily deformed. It becomes difficult to maintain the initial performance.

An amine compound obtained by adding 5 to 20 moles of ethylene oxide and / or propylene oxide to an aliphatic amine having 4 or more carbon atoms, specifically, oleylamine, laurylamine, stearylamine, etc., is added to polyester fiber in an amount of 0.1 to 0.2. 15% by weight or more, preferably 0.1% by weight.
By adhering at 20% by weight or more, the adhesive can be permeated between the polyester filaments and the convergence can be improved.

However, the adhesion rate of these active ingredients is 0.1%.
If the content is less than 5% by weight, the sizing property is inferior, so that the fibers embedded in the rubber break the single yarn during use, and eventually the strength of the belt decreases. This treatment liquid can be industrially added to a mixture of a smoothing agent such as a sulfur-containing diester or a hardened castor oil ether or an emulsifier, and used.

In the polyester fiber of the present invention, it is necessary to first melt-spin a polyester chip having an intrinsic viscosity of 0.50 to 0.80 at a spinning speed of at least 6.0 km / min. Since the orientation and relaxation do not progress, it is difficult to obtain a high-strength, low-shrinkage polyester fiber even if heat stretching and relaxing heat treatment are performed. Therefore, the orientation and relaxation of the fiber are further promoted by the heat drawing and the relaxation heat treatment, and the strength becomes 6.0 g / d or more and the shrinkage ratio becomes 2.0% or less, and the fiber is suitable for the power transmission belt. In the heat stretching and the relaxation heat treatment step, the stretching ratio is set to 1.degree.
20 to 1.40 times, relax ratio 0.90 to 0.98
This is performed twice immediately after melt spinning, or separately after winding.

After performing the thermal stretching and the relaxing heat treatment,
A treatment agent containing an ethylene oxide and / or propylene oxide adduct of an aliphatic amine is provided. At this stage, although the yarn is rapidly cooled and an increase in shrinkage is observed, the present invention is not limited to this. % Does not deviate from the shrinkage ratio. This is due to the use of low-shrinkage polyester fibers obtained by high-speed spinning, which is a feature of the present invention.

Further, since the treatment liquid does not come into contact with the heat of a heating roll or the like, it is possible to avoid the problem of generation of odors during hot stretching and the occurrence of fluff and yarn breakage due to roll contamination, and furthermore, there is no loss or deterioration of the treatment liquid due to smoking. Since the performance can be sufficiently exhibited, a polyester fiber excellent in productivity and adhesive permeability can be obtained.

[0017]

The polyester fiber of the present invention and the method for producing the same will be described in detail with reference to the following examples. The methods for measuring and evaluating the physical properties of the drawn polyester fiber are shown below. (1) Intrinsic Viscosity Using an Ostwald viscometer, the reduced viscosity of a solution in which 1 g of polyester fiber was dissolved in 100 ml of orthochlorophenol was measured in a thermostat at 35 ° C., and the intrinsic viscosity was calculated by the following equation.

Reduced viscosity = intrinsic viscosity + 0.277 × intrinsic viscosity ² (2) Strength and elongation Using a Shimadzu Autograph SS-100, JIS L
The measurement was performed according to -1017-1983 (7.5). (3) Dry Heat Shrinkage Measurement was performed at 150 ° C. for 30 minutes according to JIS L-1017-1983 (7.10.2). (4) Stretchability: A sample having few yarn breaks and fluffs and having no practical problem was rated as ○, and a roll with severe dirt and numerous thread breaks and fluffs was rated as ×. (5) Permeability of Adhesive Using the obtained drawn polyester yarn, twist twisting is performed at 270 T / m in the Z direction and 180 T / m in twisting direction in the S direction to form a twisted cord. % Isocyanate (D) trade name PAPI 135 (manufactured by Sankyo Kasei Dow Co.) / Toluene solution for 2 minutes, then left at room temperature for 2 hours, and the convergence of the cord was evaluated by the following method.

Convergence The cord and filament were scattered three times when the tip of the cord was rubbed against the back of the nail. A sample with good convergence was rated as “O”, and a sample with poor convergence was rated as “x”.

[0020]

Example 1 Melt spinning was carried out with a polyester chip having an intrinsic viscosity of 0.75, and after cooling and solidification, an oil for spinning comprising a smoothing agent and an emulsifier was added at 0.6% by weight to 6.5 km.
/ Min once at the spinning speed. Next, the unrolled polyester yarn that has been wound is combined with a first roller (75 ° C.),
Second roller (160 ° C.), third roller (240
° C), the fourth roller (240 ° C), and the winder.
The stretching ratio between the first roller and the third roller is 1.35 times, and the relaxing ratio between the third roller and the winding machine is 0.95 times. Install a refueling nozzle for applying the processing liquid between the machines,
Laurylamine ethylene oxide 15 mol adduct 5
A treatment liquid consisting of 0 parts by weight and a total amount of a smoothing agent and an emulsifier of 50 parts by weight is applied as a 15% aqueous solution to the polyester fiber, and is applied at a winding speed of 1500 m / min to 1000 d / 240 f.
To obtain a drawn polyester yarn.

The amount of the adhering product of laurylamine and ethylene oxide of 15 mol was 0.26% based on the polyester fiber. Table 1 shows the properties of the obtained polyester fiber. It is excellent in physical properties, stretchability, and adhesive permeability, and can be sufficiently applied as a polyester fiber for a power transmission belt.

[0022]

Example 2 The intrinsic viscosity of Example 1 was changed from 0.75 to 0.6.
Except having changed into the polyester chip of No. 5, it carried out on the same conditions as Example 1. The amount of adhering adduct of 15 mol of ethylene oxide of laurylamine was 0.18% with respect to the polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

It has excellent physical properties, stretchability, and adhesive permeability, and can be sufficiently applied as a polyester fiber for a power transmission belt.

[0024]

Example 3 The intrinsic viscosity of Example 1 was increased from 0.75 to 0.5.
Except having changed into the polyester chip of No. 5, it carried out on the same conditions as Example 1. The amount of the adhering product of laurylamine and ethylene oxide of 15 mol was 0.22% based on the polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

It has excellent physical properties, stretchability and adhesive permeability, and can be sufficiently applied as a polyester fiber for a power transmission belt.

[0026]

Example 4 Example 1 was carried out under the same conditions as in Example 1 except that the spinning speed was changed from 6.5 km / min to 6.0 km / min. The amount of the adduct of 15 mol of laurylamine with ethylene oxide was 0.20% based on the polyester fiber. Table 1 shows the properties of the obtained polyester fiber. It is excellent in physical properties, stretchability, and adhesive permeability, and can be sufficiently applied as a polyester fiber for a power transmission belt.

[0027]

Example 5 The procedure was performed under the same conditions as in Example 1 except that the spinning speed was changed from 6.5 km / min to 7.0 km / min. The amount of the adhering product of laurylamine with 15 mol of ethylene oxide was 0.17% based on the polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

It has excellent physical properties, stretchability and adhesive permeability, and can be sufficiently applied as a polyester fiber for a power transmission belt.

[0029]

Comparative Example 1 The intrinsic viscosity of Example 1 was changed from 0.75 to 0.4.
Except having changed into the polyester chip of No. 8, it carried out on the same conditions as Example 1. Incidentally, the amount of the adduct of 15 mol of ethylene oxide of laurylamine was 0.23% with respect to the polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

This fiber has low strength and is not preferable as a polyester fiber for a power transmission belt.

[0031]

Comparative Example 2 The intrinsic viscosity of Example 1 was changed from 0.75 to 0.8.
7 was performed under the same conditions as in Example 1 except that the polyester chip was changed to 7. The amount of the adhering product of laurylamine and ethylene oxide of 15 mol was 0.29% with respect to the polyester fiber. Table 1 shows the properties of the obtained polyester fiber. This fiber has a high dry heat shrinkage and is not preferable as a polyester fiber for a power transmission belt.

[0032]

COMPARATIVE EXAMPLE 3 The procedure was performed under the same conditions as in Example 1 except that the spinning speed in Example 1 was changed from 6.5 km / min to 5.5 km / min. The amount of adhering 15 mol of ethylene oxide adduct of laurylamine was 0.21% based on polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

This fiber has a high dry heat shrinkage and is not preferable as a polyester fiber for a power transmission belt.

[0034]

Comparative Example 4 The amount of the laurylamine ethylene oxide adduct obtained in Example 1 was set at 0.
Example 1 was repeated except that the amount was 12% by weight. Table 1 shows the properties of the obtained polyester fiber. This fiber has low adhesive permeability and is not preferable as a polyester fiber for a power transmission belt.

[0035]

Comparative Example 5 Except that the application position of the processing liquid of Example 1 was changed between the fourth roller and the winder and before the first roller.
Performed under the same conditions as in Example 1. Incidentally, the amount of the adduct of 15 mol of ethylene oxide of laurylamine was 0.23% with respect to the polyester fiber. Table 1 shows the properties of the obtained polyester fiber.

This fiber is not preferable as a polyester fiber for a power transmission belt because of poor stretchability and low adhesive permeability.

[0037]

[Table 1]

[0038]

The polyester fiber for a power transmission belt obtained by the production method of the present invention has strength and low shrinkage suitable for a power transmission belt and has excellent adhesive permeability. In addition, the production method of the present invention is industrially excellent since the production of the yarn is reduced and the production of yarn breakage and fluff is reduced.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI // F16G 1/08 F16G 1/08 A (72) Inventor Fukumi Nakamura 6-4100 Asahicho, Nobeoka-shi, Miyazaki Asahi Kasei Corporation (56) References JP-A-54-77793 (JP, A) JP-A-60-106706 (JP, A) JP-A-4-222215 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06M 15/00-15/72 D01F 6/62 D01F 6/92 D01F 11/08

Claims (2)

(57) [Claims] 1. A polyester fiber containing ethylene terephthalate as a main repeating unit, (a) having an intrinsic viscosity of 0.5 to 0.75, (b) having a dry heat shrinkage of 2% or less,
(C) A polyester fiber for a power transmission belt having an adhesion ratio of an ethylene oxide and / or propylene oxide adduct of an aliphatic amine of 0.15% by weight or more. 2. A polyester chip containing ethylene terephthalate having an intrinsic viscosity of 0.5 to 0.8 as a main repeating unit is melt-spun at a spinning speed of 6 km / min or more, and subjected to hot stretching and relaxing heat treatment. A process for producing a polyester fiber for a power transmission belt, comprising applying a treating agent containing an ethylene oxide and / or propylene oxide adduct of an aliphatic amine.