JPS5836110B2 - Polyester Senino Seizouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing polyester fiber, which is characterized in that a specific oil agent is applied to polyester fiber yarn after spinning, and the method is heat-set at a temperature of 220° C. or higher.

In particular, after spinning polyester fiber threads, an oil agent containing two types of specific components as main components is applied to provide smoothness, antistatic properties, and cohesiveness, as well as fuming tar etc. that occur when exposed to high temperatures of 220°C or higher. The present invention relates to a method for producing polyester fibers that improves the troubles described above.

In recent years, polyester fibers with low heat shrinkage rates have begun to be produced, which are mainly used for industrial materials such as sewing machines, tents, and yacht sails, and are set at a high temperature of 220° C. or higher during the drawing process.

In order to impart smoothness, antistatic properties, and cohesiveness to polyester fiber threads, and to draw them without yarn breakage or fluff, an oil agent must be applied after spinning. If exposed to high temperatures above, the oil will decompose,
There is a problem in that the smoke becomes smoke and fills the area around the drawing machine, making the working environment extremely bad.

There is also the problem that the oil decomposes and repolymerizes and accumulates on the heating roller as tar, staining the roller.

The inventor of the present invention conducted intensive research to solve these problems. (1) If an oil containing a high molecular weight smoothing agent and a high viscosity emulsifier is applied, smoke will not occur even when set at a high temperature.

(2) By combining the smoothing agent made of a copolymer of propylene oxide and ethylene oxide with the emulsifier represented by the above formula q, the amount of tar adhering to the heating roller is significantly reduced.

The present invention was completed by obtaining this knowledge.

That is, the present invention provides that after spinning a polyester fiber thread, (1) the molar ratio of propylene oxide groups and ethylene oxide groups is 50/50 or more, the molecular weight is 1,500 or more, and the terminal end is a hydroxyl group or a hydrocarbon group having 4 or less carbon atoms. 50 to 90% (by weight) of a smoothing agent made of a copolymer of polypropylene oxide and ethylene oxide; (2) an emulsifier having the following general formula (where R1 + R2 are hydrogen or a hydrocarbon group having 4 or less carbon atoms; X is a phenyl group or a cyclohexyl group, a=0~
10, b=0 to 20, and a and b cannot become O at the same time.

) A method for producing polyester fibers, which is characterized by applying an oil agent containing 10 to 50% (by weight) and heat setting at a temperature of 220° C. or higher.

The polyester in the present invention mainly refers to polyethylene terephthalate or polyethylene-2,6-naphthalate, but one of its acid or glycol components is
Up to 0% of difunctional acids such as isophthalic acid, phthalic acid, adipic acid, sebacic acid, succinic acid, oxalic acid, malonic acid, P-hydroxybenzoic acid, ω-hydroxycaproic acid, etc. or e.g. trimethylene Substituted with one or more diol compounds such as glycol, hexamethylene glycol, cyclohexanedimethanol (1,4), 2,2,4.4-tetramethylenecyclobutanediol (2,4), hydroquinone, etc. But that's fine.

The copolymers of propylene oxide and ethylene oxide used in the present invention are block copolymers obtained by adding ethylene oxide to polypropylene glycol, mono- and diesterified products of the block copolymers and fatty acids having 4 or less carbon atoms, and A random copolymer of propylene oxide and ethylene oxide added to an aliphatic alcohol with a carbon number of 4 or less, and its random copolymer and a carbon number of 4
It is an esterified product with the following fatty acids.

The molar ratio of propylene oxide groups to ethylene oxide groups should be 50/50 or more, and the molecular weight should be 1,500 or more.

When the molar ratio of propylene oxide groups and ethylene oxide groups in the copolymer of propylene oxide and ethylene oxide is less than 50/50, and the terminal end is a hydrocarbon group with a carbon number greater than 4, the amount of tar accumulated on the heating roller increases. If the molecular weight of the copolymer is less than 1,500, smoke generation will increase upon heat setting at 220° C. or higher, which is not preferable.

The emulsifier used in the present invention is represented by the general formula, R1 and R2 are hydrogen or a hydrocarbon group having 4 or less carbon atoms, and X is a phenyl group or a cyclohexyl group a, b
is an integer greater than or equal to O, and cannot be O at the same time.

Here, the emulsifier of the above formula a) may act directly for emulsification, but on the other hand, the ethylene oxide-propylene oxide copolymer used in the present invention may itself be dispersible in water, so in this sense, 0] Can be used as long as a and b in the formula are not O at the same time.

However, generally speaking, it is appropriate for a to be at most 10 and b to be at most 20.

Specific examples of these compounds include polyoxyethylene-added penzyl phenyl phenol ether, polyoxyethylene-added penzylcyclohexyl phenol ether, polyoxyethylene-added styrene phenyl phenol ether, and polyoxyethylene-added styrene cyclohexyl phenol ether. It will be done.

When R1, R2 and

The oil agent of the present invention contains 50 to 90% of a smoothing agent made of a copolymer of propylene oxide and ethylene oxide;
It must contain 10 to 50% of an emulsifier represented by the formula CI).

The amount of the smoothing agent is preferably 60 to 85%, and the amount of the emulsifier is preferably 15 to 40%.

If the leveling agent is less than 50% and the emulsifier is less than 10%, more tar will accumulate on the heating roller, making it impossible to achieve the object of the present invention.

In order to enhance the effects of smoothness, antistatic properties, and focusing properties, the oil agent of the present invention can be used in combination with other smoothing agents and various activators within a range that does not reduce the effects of the present invention.

Examples of the smoothing agent include various esters consisting of aliphatic alcohols, aromatic alcohols, aliphatic carboxylic acids, and aromatic carboxylic acids.

Examples of various activators include nonionic activators such as polyalkylene oxide adducts of higher alcohols, condensates of higher fatty acids and polyalkylene glycol, ethylene oxide adducts of esters of higher fatty acids and polyhydric alcohols, and sulfonate sulfur. Examples include anionic activators such as ate.

The oil agent of the present invention can be applied to polyester fiber threads immediately after spinning by various known methods.

Conventionally known methods include methods of adhering in the form of an aqueous emulsion, organic solvent solution, or straight without using a solvent by a roller method, spray method, dipping method, etc.
It is common to form a 5-25% aqueous emulsion and apply it by roller method.

In order to provide lubrication, antistatic properties, and cohesiveness, 0.1 to 2.0 weight of oil is applied to the polyester fibers, but the amount of oil applied is 0.1 to 2.0 in order to reduce tar on the heating roller. 1.0 weight density is preferred.

The polyester fibers to which the oil has been attached are either wound once and drawn in a separate process, or drawn immediately without being wound.

Stretching is carried out in one or two stages as is known in the art, followed by heat setting.

Heat setting can be carried out by various methods using heated rollers, heated plates, heated boxes, etc. However, the method using heated rollers is effective in producing polyester fibers with low heat shrinkage, which is the objective of the present invention. suitable for

Furthermore, when a heated roller is used, the oil agent of the present invention is particularly effective in controlling smoke and tar.

In order to obtain polyester fibers with low heat shrinkage, heat setting is 0 to 10% shrinkage and 0.0 at temperatures above 220°C.
This is performed for 3 to 0.6 Sec.

According to the method of the present invention, polyester fibers with low heat shrinkage can be produced without problems such as smoking, tar, wrapping, and thread breakage.

The method of the present invention will be explained below with reference to Examples.

Examples 1 to 11, Comparative Examples 1 to 12 A rotating oil ring in which a 15% by weight aqueous emulsion of the oil shown in Table 1 is applied, and the lower part is immersed in the emulsion before winding the polyester yarn coming out of the spinneret. Contact the roller and make it adhere.

The adhesion amount of the oil agent in Table 1 is approximately 0.
The content was adjusted to 5% by weight.

This polyester yarn was heated to 230°C with a supply roller at 79°C.
The yarn was stretched 5.1 times with a stretching roller at ℃, and then the yarn was introduced into a cooling hole roller at room temperature to shrink by 7%.
A polyester fiber of 50 denier 48 filaments was obtained.

For heat setting, the residence time of the yarn in the drawing roller at 230° C. was set to 0.2 seconds.

However, the amount of smoke generated is the level of smoke on the heating roller, and the amount of smoke generated is 13.
The degree of brown deposits on the drawing rollers after drawing for 30 minutes, the static electricity is the highest value of static pressure measured on the yarn at various points in the drawing, and the convergence is the amount of the yarn bundle on each roller in the drawing. expressed the condition.

Strength and elongation were determined using a Schopper tensile tester in a 65% RHO room at 20°C and at a tensile speed of 300 mm/min.
The dry heat shrinkage rate is the shrinkage rate when heat treated at 150℃ for 30 minutes, and the coefficient of friction against metal is 60φ, 1800 mm in contact with a 118 pear chrome bottle at 300 mm/min.
It is expressed as the coefficient of friction when running at

In this case, the friction coefficient μ is the tension on the entry side of the yarn during running, T1,
If the tension on the exit side is T2, it is a value obtained from the following equation.

Regarding all the oils in Examples 1 to 10 and Comparative Examples 1 to 12 in Table 1, the lubricity of the polyester fibers to which these oils were attached was determined by the coefficient of friction against metal of the fiber properties in Table 2, and the antistatic property was determined by the stretching condition. Static electricity and convergence were sufficiently good as shown in the column of convergence under stretching conditions, and problems such as ramps, fuzz, and thread breakage did not occur during stretching.

As shown in the fiber properties column of Table 2, the strength, elongation, and dry heat shrinkage of the obtained fibers were sufficiently high to achieve the purpose for each oil agent.

As shown in the stretching status column of Table 2, Examples 1 to 11 produced by the method of the present invention had very little smoke and tar, but in Comparative Example 1, the amount of copolymer of propylene oxide and ethylene oxide was less than 50%. In Comparative Example 2, the amount of the emulsifier of the present invention was less than 10%, in Comparative Example 3, the emulsification was performed using only the sulfonate metal salt without adding the emulsifier of the present invention, and in Comparative Example 4, the emulsifier of the present invention was not added. In Comparative Example 5, the ratio of propylene oxide groups to ethylene oxide groups in the copolymer of propylene oxide and ethylene oxide is less than 50/50. In Comparative Example 6, propylene oxide and ethylene oxide are emulsified. One end of the block copolymer with oxide has 4 carbon atoms.
In Comparative Example 7, a block copolymer of propylene oxide and ethylene oxide has an alkyl group with a carbon number larger than 4 at both ends. In Comparative Example 8, a random copolymer of propylene oxide and ethylene oxide If an alkyl group with a carbon number of more than 4 is attached to one end of the object, and if POE-added nonyl phenol is used instead of the emulsifier of the present invention in Comparative Example 9, the amount of tar accumulated on the stretching roller at 220'C or higher increases. I understand that.

Further, in Comparative Example 10, the molecular weight of the copolymer of propylene oxide and ethylene oxide was smaller than 2,000, in Comparative Example 11, POE-added dinonylphenol ether was used instead of the emulsifier of the present invention, and in Comparative Example 12, the molecular weight of the copolymer of propylene oxide and ethylene oxide was lower than 2,000. It can be seen that even if an ester type smoothing agent with a large molecular weight, which was conventionally said to have good heat resistance, was used instead of the smoothing agent of the invention, both smoke and tar were increased.

From the above results, it is clear that the oil agent of the present invention has a remarkable effect.

Claims (1)

[Claims] 1. After spinning the polyester fiber-based strip, (1) the molar ratio of propylene oxide groups and ethylene oxide groups is 50/5.
0 or more, the molecular weight is 1,500 or more, and the terminal end is a hydroxyl group or a hydrocarbon group having 4 or less carbon atoms.
~90%, (2) 10 to 5 emulsifiers having the following general formula
0% (However, R1 and R2 are hydrogen or a hydrocarbon group having 4 or less carbon atoms, X is a phenyl group or a cyclohexyl group, a = 0 to I
O, b=0 to 20, and a and b cannot become O at the same time. ) A method for producing polyester fibers, which comprises adhering an oil containing the following: and heat-setting the fibers at a temperature of 220°C or higher.