KR19980061118A - Manufacturing method of antistatic polyester fiber - Google Patents

Abstract

According to the present invention, a polyester composition containing 0.1 to 5 parts by weight of a polyoxyalkylene glycol or a derivative thereof and 0.1 to 3 parts by weight of an ionic organic compound based on 100 parts by weight of a polyester matrix is completed through a conventional polymerization and preparation process. Provided is a method for producing an antistatic polyester fiber, wherein the fibers are heat treated at a temperature of 70 ° C. to 150 ° C. for 1 to 24 hours. Application of this method makes it possible to produce polyester fibers which are excellent in antistatic properties and retain such antistatic properties for a long time.

Description

Manufacturing method of antistatic polyester fiber

The present invention relates to a method for producing an antistatic polyester fiber, and more particularly, a method for producing an antistatic polyester fiber having excellent manufacturing processability, quality stability, and antistatic laundry durability using an antistatic polyester polymer composition. It is about.

As a method of imparting antistaticity to a polyester, a method is known in which a polyoxyalkylene glycol or a derivative thereof is mixed with a polyester matrix or an ionic organic compound is compounded therein (Japanese Patent Application No. 39-5214). , 44-31828, 47-11280, and 47-10246).

In order to obtain a fiber having satisfactory antistatic properties through conventional melt spinning by containing the above antistatic agent in polyester, a large amount of antistatic agent must be included. However, when a large amount of the antistatic agent is included to increase the antistatic property, since the inherent excellent properties of the polyester are impaired, the amount of the antistatic agent that can be contained in the polyester is at most less than 5% by weight.

Accordingly, an object of the present invention is to provide an antistatic polyester fiber having sufficient antistatic properties even at a low antistatic agent content and retaining physical properties of polyester.

In the study of the present inventors to solve the above problems, a polyester composition containing a polyoxyalkylene glycol or a derivative thereof and an ionic organic compound in a polyester matrix is prepared using a fiber prepared through a conventional polymerization and weaving process. It has been found that the heat treatment at a specific temperature and time allows the production of antistatic polyester fibers having sufficient antistatic properties and retaining polyester's inherent properties.

Therefore, according to the present invention, a polyester composition containing 0.1 to 5 parts by weight of polyoxyalkylene glycol or a derivative thereof and 0.1 to 3 parts by weight of an ionic organic compound with respect to 100 parts by weight of the polyester matrix is subjected to a conventional polymerization and preparation process. Provided is a method for producing an antistatic polyester fiber, wherein the finished fiber is heat treated at a temperature of 70 ° C. to 150 ° C. for 1 to 24 hours.

Hereinafter, the present invention will be described in more detail.

The present invention is characterized in that the heat-treated for 1 to 24 hours at a temperature of 70 ℃ ~ 150 ℃ finished fiber through the normal polymerization, weaving process with the polyester composition.

The polyester fiber which heat-treated the completed fiber as mentioned above is excellent in antistatic property, and this antistatic property is maintained for a long time. The reason for this is that since the antistatic agent components are diffused to the fiber surface by the above heat treatment process, the static electricity accumulated on the surface can be more easily removed, and thus the antistatic agent has excellent antistatic properties. It is easy to increase the polymer's intrinsic viscosity during the polymerization process because it is possible to use a smaller amount of antistatic agent than the existing antistatic polyester fiber that is not subjected to the process. Even if it passes through, since it is relatively hard to detach | desorb from a polyester matrix, it is maintained for a long time.

When the heat treatment temperature of the finished fiber is lower than 70 ℃, the movement of the molecular chain of the amorphous region constituting the polyester fiber is extremely low, so that the antistatic agent component is hard to come out on the surface of the polyester fiber, reducing the static electricity during friction It is weak, and at the heat treatment temperature exceeding 150 ° C., there is a disadvantage in that physical properties inherent in polyester fibers are degraded by pyrolysis. On the other hand, when the heat treatment time is less than 1 hour in the above temperature range, the heat treatment effect is weak and the antistatic property is not greatly improved. When the heat treatment time exceeds 24 hours, there is a problem in that physical property degradation or yellowing occurs.

In the polyester composition used in the present invention, the polyester matrix is an aromatic polyester having an aromatic ring in the repeating group of the polymer, and includes a difunctional aromatic acid or an ester forming derivative thereof and a glycol or an ester forming derivative thereof. It is a polymer obtained through reaction with.

Examples of the difunctional aromatic acid include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, and the like, of which terephthalic acid is particularly preferable. You may use together 2 or more types of these bifunctional aromatic acids. Moreover, you may use together at least 1 type of these bifunctional aromatic acids and 5-sodium sulfoisophthalic acid.

Preferred glycols are aliphatic glycols such as ethylene glycol, trimethylene glycol, butylene glycol, aliphatic aromatic glycols, aromatic diols and mixtures thereof.

Preferred aromatic polyesters include homopolymers such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; Copolymers of polyethylene isophthalate and polyethylene terephthalate. Of these, polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate, which are excellent in physical properties and moldability, are particularly preferable.

Aromatic polyesters are synthesized by any method. For example, in the description of polyethylene terephthalate, glycol esters of terephthalic acid and / or its esters may be directly reacted with terephthalic acid and ethylene glycol, or by transesterification of lower alkyl esters of terephthalic acid such as dimethyl terephthalate with ethylene glycol. Prepared in one step to produce the oligomer, followed by a two step reaction in which the product is heated under reduced pressure to polycondensate until the desired degree of polymerization is reached. The polyester fibers may contain other thermoplastic polymers within the range of not losing the original physical properties of the polyester.

As the polyoxyalkylene glycol or a derivative thereof contained in the polyester composition, all kinds of compounds conventionally proposed to be added to the manufacturing process of the thermoplastic resin to impart antistatic properties are possible, and even if two or more of these are used in combination good. It is especially preferable that average molecular weights are 2,000-30,000 among these well-known polyoxyalkylene glycol or its derivative (s). The reason is that when the average molecular weight of polyoxyalkylene glycol or derivatives thereof is less than 2,000, it is difficult to form a sufficiently long dispersed phase in the fiber axis direction in the polyester fiber, and thus, the antistatic property may be poor. This is because the dispersion may become nonuniform and deteriorate the antistatic property.

The amount of polyoxyalkylene glycol or derivatives thereof in the polyester composition is 0.1 to 5 parts by weight based on 100 parts by weight of the polyester matrix. If it is less than 0.1 part by weight, sufficient antistatic property is not obtained. If it is more than 5 parts by weight, the antistatic property is improved, but the physical properties, light resistance, and the like of the obtained polyester fiber are deteriorated.

Examples of ionic organic compounds suitable for inclusion in the polyester composition include sulfonic acid alkali metal salts consisting of sulfonic acids such as undecylbenzenesulfonic acid, dodecylbenzenesulfonic acid, tridecylbenzenesulfonic acid and alkali metals, and the like. It may be contained alone in the composition or in a mixture of two or more thereof. The amount of the ionic organic compound added is preferably 0.1 to 3 parts by weight based on 100 parts by weight of the polyester matrix. When the content of the ionic organic compound in the composition is less than 0.1 part by weight, the antistatic property is insignificant. When the content of the ionic organic compound is more than 3 parts by weight, the whiteness and dyeing property of the obtained polyester fiber deteriorate.

In the production of the polyester fibers of the present invention, antioxidants such as hindered phenols, sulfides, and phosphites, and ultraviolet absorbers such as benzophenones and benzotriazoles can be blended in addition to the above-mentioned compositional components. For example, when an antioxidant is blended, the antistatic agent resulting from the thermal decomposition of polyoxyalkylene or its derivative resulting from retention in a melt spinning process, etc. can be suppressed. In addition, if necessary, the process of spinning the flame retardant, optical brightener, titanium dioxide, zinc sulfate, barium sulfate, colorant, silica, alumina, calcium carbonate, calcium phosphate and other optional additives in the polymerization of polyester fibers You may add to the arbitrary stages up to separately or in advance, respectively.

In the present invention, the intrinsic viscosity [μ] of the polyester is preferably 0.50 or more. If the intrinsic viscosity is less than 0.50, the elongational viscosity after exiting the spinneret is so low that the alkylene oxide chains in the polyalkylene glycol or its derivatives are difficult to take a sufficient lengthwise dispersion form in the polyester fiber and are therefore antistatic This is insufficient, the crystallization is easily caused by heat, the toughness is poor and tends to be fragile, so wear resistance is insufficient, there is a problem that the antistatic agent is easily detached from the polyester backbone during heat treatment, the antistatic property is lowered.

There is no particular limitation on the material of the polyester fiber described in the present invention, and the cross-sectional shape exhibits antistatic properties even when adopting any of circular, triangular, flat, and hollow forms of these types.

According to the present invention as described above, even if a small amount of antistatic agent is used, an antistatic polyester fiber having excellent antistatic property and excellent washing process durability, manufacturing stability, antistatic property and antistatic property is obtained.

Features and other advantages of the present invention as described above will become more apparent from the examples and comparative examples described below. However, the present invention is not limited to the following examples.

Example 1

A polyester resin containing 2 parts by weight of polyoxyalkylene glycol (average molecular weight 10,000) and 1 part by weight of sodium dodecyl sulfite was prepared by 100 parts by weight of the polyester matrix by a conventional polyester polymerization method. The prepared resin was subjected to a normal spinning and spinning process to produce fibers having a denier and fineness of 75/24. The prepared fibers were treated at 80 ° C. in a convection oven for 8 hours.

Plain weave fabric was woven from the fiber after heat treatment, and the fabric was kept in a constant temperature and humidity chamber at 20 ° C. and 40% relative humidity for 24 hours. . In addition, the fabric was subjected to weight loss treatment for 10 minutes in a 5% aqueous solution of sodium hydroxide, and then dried in the constant temperature and humidity chamber under the same conditions, and the frictional voltage and the half-life were measured. Further, the fabric weight-reduced under the above conditions was washed 50 times, dried, and then pretreated under the same conditions in the constant temperature and humidity chamber, and the friction band voltage and half-life were measured. The above measurement results are shown in Table 2 below.

EXAMPLE 2 AND COMPARATIVE EXAMPLES 1-4

The same procedure as in Example 1 was repeated except that the conditions were changed as shown in Table 1 below.

TABLE 1

TABLE 2

As can be seen from Tables 1 and 2 above, in Examples 1 and 2 in which the finished fiber was heat-treated within the temperature and treatment time ranges according to the present invention, antistatic properties were compared with those of Comparative Examples 1 to 4 that were not. While this is excellent, this antistatic property is maintained for a long time.

Claims (4)

A polyester composition containing 0.1 to 5 parts by weight of polyoxyalkylene glycol or a derivative thereof and 0.1 to 3 parts by weight of an ionic organic compound based on 100 parts by weight of the polyester matrix, and the finished fiber after conventional polymerization and weaving process A method for producing an antistatic polyester fiber, characterized in that the heat treatment for 1 to 25 hours at a temperature of ℃ ~ 150 ℃. The antistatic polyester fiber according to claim 1, wherein the ionic organic compound is one or two or more mixtures selected from the group consisting of alkali metal salts of undecylbenzenesulfonic acid, dodecylbenzenesulfonic acid and tridecylbenzenesulfonic acid. Manufacturing method. The method for producing an antistatic polyester fiber according to claim 1, wherein the average molecular weight of the polyoxyalkylene glycol is 2,000 to 30,000. The method for producing an antistatic polyester fiber according to claim 1, wherein the intrinsic viscosity [μ] of the polyester is 0.50 or more.