KR19980015669A - METHOD FOR PRODUCING BASIC DYESTUFORM POLYESTER FIBER - Google Patents

Abstract

The present invention relates to a method for producing a polyester fiber having high strength of a fiber yarn and excellent alkali resistance, as well as excellent dyeability, compared with a conventional basic dye-dyeable polyester fiber.

Specifically, the present invention is characterized in that an additive which is used alone or in combination with the compound of the general formula (III) and (IV) together with the compound of the following general formula (II) is added during the polyester polymerization process, The polyester fiber thus produced has not only superior physical and chemical properties such as strength and alkali resistance but also greatly improved dyability.

In general formula (II)

(Wherein R is H, CH 3, CH 2 CH 2 OH, R 1, R 2, R 3 and R 4 are CH 2 CH 2 CH 2 CH 3)

(Wherein R1 is H, CnH2n + 1, R2 is H, CnH2n + 1, R3 is H, CnH2n + 1, M is Na, Li, K and n is an integer of 1 to 5)

Description

METHOD FOR PRODUCING BASIC DYESTUFORM POLYESTER FIBER

The present invention relates to a method for producing a dye-flame-type polyester fiber having a high strength of a fiber yarn and an excellent alkali resistance, as well as good dyeability, compared to a conventional basic dye-flame-type polyester fiber.

Polyesters have excellent properties in terms of various physical properties such as mechanical strength, so they are widely used as fibers, but they are difficult to dye. The reason is as follows. First, polyester does not contain an ionic group in the chain and thus is not bonded to an ionic dye. Second, the crystal structure is dense and the dye molecule is hardly penetrated into the fiber. Therefore, it has been pointed out that dyeing is performed under high temperature and high pressure in order to relax the crystal structure in general and the dyeing cost increases. In order to solve this problem, an attempt has been made to introduce an anion group into the polyester chain so as to be relatively easily combined with a cationic dye. As a result, a bifunctional carboxylic acid containing a sulfonic acid metal base represented by the following general formula (I) Is copolymerized with an ester unit.

In general formula (I)

(Wherein R is H, CH ₃ , CH ₂ CH ₂ OH, M is Na, Li, K)

Japanese Patent Application Nos. 34-10479, 51-105417, 55-158328, U.S. Pat. Nos. 3649571 and 3922250 disclose isophthalic acid components containing a sulfonic acid metal base, such as 5-sodium sulfoisophthalic acid component Is added during the polyester reaction to give the polyester fiber a cationic dye salt-adsorbing property. However, when the above modifiers are copolymerized, they have a much higher melt viscosity under the same intrinsic viscosity than ordinary polyesters due to the viscosity increasing action, making it difficult to produce polyesters having a degree of polymerization of the general polyester level. Therefore, there is a problem in that the mechanical property required of the yarn such as strength is low, and the glycol ester of the copolymerization component has a higher hydrolysis rate than other acidic glycol esters. Therefore, when the copolymer polyester fiber is treated with an alkali solution, Is hydrolyzed selectively, so that there are many restrictions on the use of the polyester fiber.

On the other hand, Japanese Patent Application No. 47-223349, Japanese Patent Application Laid-Open No. 63-211322, Japanese Patent Application Laid-Open No. 3-241024, Japanese Patent Application Laid-Open No. 4-289219 and US Pat. No. 3,732,183 use an isophthalic acid component having a sulfonic acid phosphonium base as a cationic dye- Method. According to this method, the isophthalic acid component of the sulfonic acid phosphonium base has a little effect of the thickening action in the polymerization reaction, so that even when the degree of polymerization is increased, the melt viscosity becomes a range in which normal melt reflection is possible, and the cationic dye- However, since the fiber prepared from the isophthalic acid component having a phosphonium group has a higher hydrolysis rate than other glycol esters, the effect of improving the degree of polymerization is less effective in improving the alkalinity.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the conventional problems, and it is an object of the present invention to provide a polyester fiber characterized in that a specific compound is added together with a modifier during polymerization to improve the dyeability and alkali resistance of the basic dye- ≪ / RTI >

Hereinafter, the present invention will be described in detail.

Specifically, the present invention relates to a polyester fiber having excellent properties such as excellent dyeing property, which is produced by using a polymer produced by introducing a compound represented by the following general formula (II), (III) or (IV) And a method for producing the same.

In general formula (II)

(Wherein R is H, CH ₃ , CH ₂ CH ₂ OH, R 1, R ₂ , R 3 and R 4 are CH ₂ CH ₂ CH ₂ CH ₃ )

(Wherein R ₁ is H, C _n H _{2n + 1} , R ₂ is H, C _n H _{2n + 1} , R ₃ is H, C _n H _{2n + 1} , M is Na, Li, n is an integer of 1 to 5)

In the present invention, the amount of the modifier added in the general formula (II) is suitably 0.5 to 2.5 mol% (preferably 0.8 to 2.0 mol%) with respect to the acidic terephthalic acid or other bifunctional carboxylic acid. If the content is less than 0.5 mol%, the dyeing can not be performed favorably due to the shortage of seated seats. When the content is more than 2.5 mol%, it decomposes itself under high temperature conditions such as a polymerization reaction or a melt spinning process. . Not only the mechanical properties are deteriorated but also the alkali resistance is poor.

In the present invention, the compounds of the general formulas (III) and (IV) used together with (II) are used singly or in combination, and the amount thereof is preferably 0.5 to 5.0% by weight (preferably 1.0 to 3.0% Do. If the amount of the compound represented by the general formula (III) or (IV) is less than 0.5% by weight, the dyeing effect is not sufficient for the cationic dye and the dyeing effect is low. If the amount exceeds 5.0% by weight, the mechanical properties are deteriorated and the dyeing is likely to occur.

The modified polyester fibers produced by the present invention can be dyed with basic dyes and have excellent alkali resistance so that they can be treated with a common alkali which improves the texture of the fabric and has a polymerization degree higher than that of the basic dyestuffs Can be used in looms having high friction properties because they are made from polymer and have excellent strength.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. The properties of the yarn are measured as follows.

* Diethylene glycol (DEG): The polyester is pyrolyzed with hydrazine hydrate and measured by gas chromatography.

* Weight loss ratio (%): A polyester fiber sample is placed in a solution of 50 g of sodium hydroxide dissolved in 1 L of water, maintained at 100 ° C. for 20 minutes, and then measured by weight consumption.

* Absorptivity (%): CATHILON BLUE CD-RLH 2% owf and 1% aciby 1: 100, which is a basic dye, was heated to 100 ° C over 1 hour and maintained at that temperature for 1 hour. DYE-O-METER).

Example 1

20 kg of oligomer was prepared by charging a well mixed slurry of 8454 g of terephthalic acid (TPA) and 3875 g of ethylene glycol (EG) over 6 hours while maintaining a polymerization tank containing 10 kg of polyethylene terephthalate (PET) oligomer at 260 캜 Transfer 10 kg to another polymerization tank. 5 g of antimony trioxide and 5 g of 3,5-dicarboxybenzenesulfonic acid tetrabutylphosphonium salt corresponding to the formula (II) were added to the oligomer in an amount of 0.5 mol%, 0.8 mol%, 1.2 mol%, 1.5 mol%, 1.8 mol% (200 g) of the compound corresponding to the general formulas (III) and (IV) were added, and then the pressure was reduced from 760 mmHg to 1 mmHg And reacted at 280 DEG C to prepare basic dye-halogenated polyesters of the level of 0.65. Each of the obtained polymers was dried by a usual method and then spun at a rate of 1000 m / min at a temperature of 280 ° C using a spinneret having 36 circular pores having a pore size of 0.25 mm in diameter. The obtained non-drawn filament was drawn 3.4 times at a drawing speed of 1070 m / min by a heating roller maintained at 80 占 폚 and a hot plate maintained at 120 占 폚 to produce drawn yarn of 75d / 36f, respectively.

The physical properties of the obtained yarn were measured and are shown in Table 1.

Example 2

* The same procedure as in Example 1 was carried out except that 100 g, 150 g, 250 g and 300 g of a 1: 1 mixture of the compounds (III) and (IV) were added to 384 g (1.5ahf%) of the compound The properties of the obtained yarn were measured and are shown in Table 2.

Comparative Example 1

The procedure of Example 1 was repeated except that the compound (III) and the compound (IV) were not used and only the compound (II) was used at 1.0, 2.0, 3.0 and 4.0 mol% Respectively.

Claims (4)

(III) and (IV), either alone or in combination with the compound represented by the following general formula (II), in the polymerization step in the production of the polyester fiber by the polymerization process of the polyester By weight based on the total weight of the polyester. In general formula (II) (Wherein R is H, CH ₃ , CH ₂ CH ₂ OH, R 1, R ₂ , R 3 and R 4 are CH ₂ CH ₂ CH ₂ CH ₃ ) General formula (III) General formula (IV) (Wherein R ₁ is H, C _n H _{2n + 1} , R ₂ is H, C _n H _{2n + 1} , R ₃ is H, C _n H _{2n + 1} , M is Na, Li, n is an integer of 1 to 5) The process according to claim 1, wherein the compound of formula (II) is used in an amount of 0.5 to 5.0 mol% based on the acid component. The method according to claim 1, wherein the total amount of the compound represented by formula (III) and (IV) is 0.5 to 5.0 wt% based on the acid component. The process according to claim 1, wherein the compound of formula (II) is a 3,5-dicarboxybenzenesulfonic acid tetrabutylphosphonium salt.